import type { IncomingMessage, ServerResponse } from "node:http";
import type { Plugin } from "vite";
import type {
  AutostartPolicy,
  BackupView,
  Build,
  CreateServerRequest,
  FleetServer,
  Identity,
  LoginResult,
  Phase,
  ServerInfo,
  WhitelistImage,
} from "../src/lib/types";

const ACCOUNT_IDS = ["owner", "user", "linked", "setup"] as const;

type AccountID = (typeof ACCOUNT_IDS)[number];
type Role = "admin" | "user";
type Method = "GET" | "POST" | "DELETE";
type CreateError =
  | "bad_request"
  | "already_exists"
  | "subdomain_taken"
  | "image_not_whitelisted";

interface MockAccount {
  id: AccountID;
  role: Role;
  email: string;
  linked: boolean;
  mustChangePassword: boolean;
}

interface MockServer extends ServerInfo {
  owner: AccountID | null;
}

interface AccessState {
  whitelist: string[];
  banned: string[];
  // online is the mock's stand-in for the live RCON "list" roster. Kick and ban
  // splice a player out of it so the demo roster reflects the action on reload.
  online: string[];
}

interface MockState {
  accounts: Record<AccountID, MockAccount>;
  servers: MockServer[];
  images: WhitelistImage[];
  access: Record<string, AccessState>;
  backups: BackupView[];
  builds: Build[];
}

// PLAYER_NAME mirrors the backend's mcNameRe (handlers_access.go) so the mock
// rejects a malformed player exactly as the real API would (400 bad_request),
// keeping the panel's error path exercisable in dev.
const PLAYER_NAME = /^[A-Za-z0-9_]{1,16}$/;

interface RequestContext {
  req: IncomingMessage;
  res: ServerResponse;
  state: MockState;
  method: string;
  parts: string[];
}

interface SessionContext extends RequestContext {
  account: MockAccount;
}

const SESSION_COOKIE = "felis_mock_session";
const ROOT_DOMAIN = "dev.felis.localhost";
const API_BASE = "/api/v1";
const MOCK_PASSWORD = "devpassword";
const MOCK_LINK_CODE = "LINK1234";
const MC_UUID = "00000000-0000-4000-8000-000000000001";
const RESET_ROUTE = `${API_BASE}/__mock/reset`;

const LOGIN_HINT_STYLE = `
#felis-mock-login-hint {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 2147483647;
  max-width: min(360px, calc(100vw - 40px));
  border: 1px dashed hsl(217 33% 22%);
  border-radius: 8px;
  background: hsl(222 47% 8% / 0.96);
  color: hsl(215 20% 70%);
  box-shadow: 0 18px 60px hsl(222 47% 3% / 0.45);
  padding: 12px;
  font: 12px/1.55 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
#felis-mock-login-hint strong {
  display: block;
  color: hsl(210 40% 98%);
  font-size: 13px;
  margin-bottom: 4px;
}
#felis-mock-login-hint code {
  color: hsl(210 40% 98%);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}
`;
const LOGIN_HINT_SCRIPT = `
(() => {
  const id = "felis-mock-login-hint";
  const html = '<aside id="' + id + '" aria-label="Mock sign-in credentials"><strong>Mock sign-in</strong><div>Admin: <code>owner</code> / <code>${MOCK_PASSWORD}</code></div><div>User: <code>user</code> / <code>${MOCK_PASSWORD}</code> (not linked)</div><div>User: <code>linked</code> / <code>${MOCK_PASSWORD}</code> (linked)</div><div>First login: <code>setup</code> / <code>${MOCK_PASSWORD}</code></div><div>Link code: <code>${MOCK_LINK_CODE}</code></div></aside>';
  const sync = () => {
    const existing = document.getElementById(id);
    if (location.pathname === "/login") {
      if (!existing) document.body.insertAdjacentHTML("beforeend", html);
      return;
    }
    existing?.remove();
  };
  const notify = () => setTimeout(sync, 0);
  for (const key of ["pushState", "replaceState"]) {
    const original = history[key];
    history[key] = function (...args) {
      const out = original.apply(this, args);
      notify();
      return out;
    };
  }
  addEventListener("popstate", notify);
  addEventListener("DOMContentLoaded", sync);
  sync();
})();
`;

// World-backup seed. A backup is written when the reaper archives an inactive
// world, so these read as "sleep saves": a handful for survival (recent through one
// nearly expired, to exercise the relative-time and near-expiry states), one for
// modded, none for the rest so the empty state shows too. former_owner is the
// archiving owner; GET /backups is scoped by it for non-admins (BackupsForUser).
const GiB = 1024 ** 3;
const DAY_MS = 86_400_000;
const RETENTION_DAYS = 90;

function backup(server: string, daysAgo: number, sizeBytes: number, formerOwner: string): BackupView {
  const created = Date.now() - daysAgo * DAY_MS;
  return {
    id: `bk-${server}-${daysAgo}`,
    server_name: server,
    former_owner: formerOwner,
    size_bytes: Math.round(sizeBytes),
    reason: "inactive_15d",
    status: "present",
    created_at: new Date(created).toISOString(),
    expires_at: new Date(created + RETENTION_DAYS * DAY_MS).toISOString(),
  };
}

function mockBackups(): BackupView[] {
  return [
    backup("survival", 5, 1.4 * GiB, "owner"),
    backup("survival", 20, 1.3 * GiB, "owner"),
    backup("survival", 45, 1.2 * GiB, "owner"),
    backup("survival", 88, 2.1 * GiB, "owner"), // ~2 days from expiry — exercises the urgency state
    backup("modded", 12, 0.6 * GiB, "owner"),
  ];
}

function initialState(): MockState {
  return {
    accounts: {
      owner: account("owner", "admin", true, false),
      user: account("user", "user", false, false),
      linked: account("linked", "user", true, false),
      setup: account("setup", "admin", true, true),
    },
    images: [
      { image_ref: "registry.felis.svc:5000/paper-1.21:demo", enabled: true, source: "demo" },
      { image_ref: "registry.felis.svc:5000/fabric-1.20.1:demo", enabled: true, source: "demo" },
      {
        image_ref: "registry.felis.svc:5000/forge-1.20.1:disabled",
        enabled: false,
        source: "demo",
      },
    ],
    servers: [
      server("survival", "Survival SMP", "Running", "owner", {
        players: 12,
        maxPlayers: 20,
        autostartPolicy: "public",
      }),
      server("lobby", "Hub Lobby", "Running", "linked", {
        players: 28,
        maxPlayers: 60,
        autostartPolicy: "public",
      }),
      server("creative", "Creative Lab", "Stopped", "user", {
        autostartPolicy: "public",
        maxPlayers: 16,
      }),
      server("modded", "Modded Testbed", "Starting", "owner", {
        autostartPolicy: "allowlist",
        maxPlayers: 12,
      }),
      server("broken", "Broken Node", "Failed", "user", {
        autostartPolicy: "ownerOnly",
        maxPlayers: 8,
      }),
      server("claim-me", "Claimable Node", "Stopped", null, {
        maxPlayers: 10,
      }),
      ...generatedServers(),
    ],
    access: {
      // Seeded past a page (PAGE_SIZE=10) and the search threshold (>8) so the
      // whitelist's paging + filter are both exercisable in the mock demo.
      survival: {
        whitelist: [
          "mock_player", "test_player", "Notch", "jeb_", "Dinnerbone",
          "Grumm", "Steve", "Alex", "Herobrine", "Technoblade",
          "Dream", "GeorgeNotFound", "Sapnap", "BadBoyHalo", "Skeppy",
          "Tommyinnit", "Tubbo", "Ranboo", "Wilbur_Soot", "Philza",
          "Captain_Puffy", "Nihachu", "Fundy", "Quackity", "Karl_Jacobs",
        ],
        // 12 banned names — past the search threshold (>8) and a page (>10) so the ban
        // list's filter + paging demo too; kept distinct from the online roster so the
        // mock reads like a real server (you don't ban who's currently on).
        banned: [
          "Griefer_99", "tnt_troll", "hack_client_x", "spam_bot_01", "lava_caster",
          "dupe_glitcher", "griefKing", "nukebot", "AFK_farmer", "chat_spammer",
          "xray_cheater", "fly_hacker",
        ],
        // 12 online, matching the server's players:12 — past the search threshold (>8)
        // and a page (>10) so the roster's filter + paging are both exercisable, with a
        // few non-whitelisted names to try kick / ban on.
        online: [
          "mock_player", "test_player", "Notch", "Steve", "Alex", "jeb_",
          "Dinnerbone", "Griefer_88", "rndGuest_7", "xX_Raider_Xx", "creeper_fan", "Herobrine",
        ],
      },
    },
    backups: mockBackups(),
    builds: [
      {
        id: "bld-1",
        image_ref: "registry.felis.svc:5000/modpack-beta:1.0",
        status: "succeeded",
        requested_by: "owner@mock.felis.local",
        created_at: new Date(Date.now() - 3600000).toISOString(),
        finished_at: new Date(Date.now() - 3500000).toISOString(),
      },
      {
        id: "bld-2",
        image_ref: "registry.felis.svc:5000/forge-broken:1.0",
        status: "failed",
        error: "trivy found a CRITICAL CVE: CVE-2026-12345 in library/forge",
        requested_by: "owner@mock.felis.local",
        created_at: new Date(Date.now() - 1800000).toISOString(),
        finished_at: new Date(Date.now() - 1700000).toISOString(),
      },
    ],
  };
}

// generatedServers fills the mock fleet past one page so the SysAdmin cockpit's
// pagination and fuzzy search are actually exercisable in dev. Deterministic (no
// Math.random) so the demo is stable across reloads: phase / owner / policy /
// capacity all cycle. 8 themes × 3 = 24 servers; with the 6 hand-authored ones the
// fleet is 30 → two pages at PAGE_SIZE 20.
function generatedServers(): MockServer[] {
  const phases: Phase[] = ["Running", "Stopped", "Starting", "Failed", "Running", "Stopped"];
  const owners: (AccountID | null)[] = ["owner", "linked", "user", null];
  const policies: AutostartPolicy[] = ["ownerOnly", "public", "allowlist"];
  const themes = ["smp", "creative", "skyblock", "anarchy", "minigames", "build", "pvp", "vanilla"];
  const out: MockServer[] = [];
  let i = 0;
  for (const theme of themes) {
    for (let n = 1; n <= 3; n++) {
      const phase = phases[i % phases.length];
      const max = 10 + ((i * 7) % 50);
      out.push(
        server(`${theme}-${String(n).padStart(2, "0")}`, `${theme} #${n}`, phase, owners[i % owners.length], {
          players: phase === "Running" ? 1 + ((i * 3) % max) : 0,
          maxPlayers: max,
          autostartPolicy: policies[i % policies.length],
        }),
      );
      i++;
    }
  }
  return out;
}

function mockStartupMessage(): string {
  return [
    "",
    "  Felis mock API",
    `  API base: ${API_BASE}`,
    `  Root domain: ${ROOT_DOMAIN}`,
    "",
    "  Accounts:",
    `    owner  / ${MOCK_PASSWORD}  admin, linked`,
    `    user   / ${MOCK_PASSWORD}  user, not linked`,
    `    linked / ${MOCK_PASSWORD}  user, linked`,
    `    setup  / ${MOCK_PASSWORD}  admin, first-login password change`,
    "",
    `  Link code: ${MOCK_LINK_CODE}`,
    `  Reset state: curl -X POST http://127.0.0.1:5173${RESET_ROUTE}`,
    "",
  ].join("\n");
}

function account(
  id: AccountID,
  role: Role,
  linked: boolean,
  mustChangePassword: boolean,
): MockAccount {
  return {
    id,
    role,
    linked,
    mustChangePassword,
    email: `${id}@mock.felis.local`,
  };
}

function server(
  name: string,
  displayName: string,
  phase: Phase,
  owner: AccountID | null,
  overrides: Partial<ServerInfo> = {},
): MockServer {
  return {
    name,
    subdomain: name,
    displayName,
    phase,
    desiredState: phase === "Stopped" ? "Stopped" : "Running",
    players: phase === "Running" ? 1 : 0,
    maxPlayers: 20,
    autostartPolicy: "ownerOnly",
    owned: false,
    claimable: false,
    owner,
    ...overrides,
  };
}

function sendJSON(res: ServerResponse, status: number, value: unknown): void {
  res.statusCode = status;
  res.setHeader("Content-Type", "application/json");
  res.end(JSON.stringify(value));
}

function sendError(
  res: ServerResponse,
  status: number,
  code: string,
  message: string,
): void {
  sendJSON(res, status, { error: { code, message } });
}

function route(ctx: RequestContext): string {
  return `${ctx.method} ${ctx.parts.slice(2).join("/")}`;
}

function is(method: Method, ctx: RequestContext): boolean {
  return ctx.method === method;
}

async function readJSON<T>(req: IncomingMessage): Promise<T> {
  const chunks: Buffer[] = [];
  for await (const chunk of req) {
    chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
  }
  const text = Buffer.concat(chunks).toString("utf8");
  return (text ? JSON.parse(text) : {}) as T;
}

function readAccount(req: IncomingMessage, state: MockState): MockAccount | null {
  const ids = ACCOUNT_IDS.join("|");
  const m = new RegExp(`(?:^|;\\s*)${SESSION_COOKIE}=(${ids})(?:;|$)`).exec(
    req.headers.cookie ?? "",
  );
  return m ? state.accounts[m[1] as AccountID] : null;
}

function setSessionCookie(res: ServerResponse, accountID: AccountID): void {
  res.setHeader("Set-Cookie", `${SESSION_COOKIE}=${accountID}; Path=/; SameSite=Lax`);
}

function clearSessionCookie(res: ServerResponse): void {
  res.setHeader("Set-Cookie", `${SESSION_COOKIE}=; Path=/; Max-Age=0; SameSite=Lax`);
}

function loginAccount(username: string): AccountID | null {
  const normalized = username.toLowerCase();
  return ACCOUNT_IDS.includes(normalized as AccountID) ? (normalized as AccountID) : null;
}

function identity(accountInfo: MockAccount): Identity {
  return {
    user_id: `mock-${accountInfo.id}`,
    email: accountInfo.email,
    role: accountInfo.role,
    is_admin: accountInfo.role === "admin",
    must_change_password: accountInfo.mustChangePassword,
  };
}

function findServer(state: MockState, name: string): MockServer | null {
  return state.servers.find((s) => s.name === name) ?? null;
}

function canSee(accountInfo: MockAccount, serverInfo: MockServer): boolean {
  return accountInfo.role === "admin" || serverInfo.owner === accountInfo.id || serverInfo.owner === null;
}

function canManage(accountInfo: MockAccount, serverInfo: MockServer): boolean {
  return accountInfo.role === "admin" || serverInfo.owner === accountInfo.id;
}

function visibleServers(state: MockState, accountInfo: MockAccount): ServerInfo[] {
  return state.servers
    .filter((serverInfo) => canSee(accountInfo, serverInfo))
    .map((serverInfo) => projectServer(serverInfo, accountInfo));
}

// fleetView projects the internal mock servers into the GET /fleet wire shape
// (the SysAdmin cockpit's read). It is the mock mirror of the Go fleetServerView:
// the CRD field names (playersOnline/playersMax, ready, endpoint*) — NOT the
// me/servers projection's players/maxPlayers — plus the owner joined as the email
// (COALESCE(email, username) server-side). Endpoint and live player counts are
// gated on Running, exactly as the real cluster reports them.
function fleetView(state: MockState): FleetServer[] {
  return state.servers.map((s, i) => {
    const ready = s.phase === "Running";
    return {
      name: s.name,
      subdomain: s.subdomain,
      phase: s.phase,
      ready,
      desiredState: s.desiredState,
      autostartPolicy: s.autostartPolicy,
      endpointMode: "domain",
      endpointAddress: ready ? `10.43.0.${10 + i}:25565` : undefined,
      playersOnline: ready ? s.players ?? 0 : 0,
      playersMax: s.maxPlayers ?? 0,
      owner: s.owner ? state.accounts[s.owner].email : "",
    };
  });
}

function projectServer(serverInfo: MockServer, accountInfo: MockAccount): ServerInfo {
  const { owner: _owner, ...wire } = serverInfo;
  const owned = canManage(accountInfo, serverInfo);
  return {
    ...wire,
    owned,
    claimable: serverInfo.owner === null && accountInfo.linked && !owned,
  };
}

function setPhase(serverInfo: MockServer, phase: Phase): void {
  serverInfo.phase = phase;
  serverInfo.desiredState = phase === "Stopped" ? "Stopped" : "Running";
  serverInfo.players = phase === "Running" ? Math.max(serverInfo.players ?? 0, 1) : 0;
}

function policy(value: unknown): AutostartPolicy {
  return value === "public" || value === "allowlist" ? value : "ownerOnly";
}

function createServer(
  state: MockState,
  owner: AccountID,
  req: Partial<CreateServerRequest>,
): MockServer | CreateError {
  const name = req.name?.trim();
  const subdomain = req.subdomain?.trim();
  if (!name || !subdomain || !req.image) return "bad_request";
  if (findServer(state, name)) return "already_exists";
  if (state.servers.some((s) => s.subdomain === subdomain)) return "subdomain_taken";
  if (!state.images.some((i) => i.enabled && i.image_ref === req.image)) {
    return "image_not_whitelisted";
  }

  const created = server(name, req.displayName?.trim() || name, "Stopped", owner, {
    subdomain,
    players: 0,
    maxPlayers: 20,
    autostartPolicy: policy(req.autostartPolicy),
  });
  state.servers.unshift(created);
  return created;
}

function sendCreateError(res: ServerResponse, code: CreateError): void {
  const status = code === "already_exists" || code === "subdomain_taken" ? 409 : 400;
  sendError(res, status, code, code);
}

async function handlePublic(ctx: RequestContext): Promise<boolean> {
  switch (route(ctx)) {
    case "POST auth/login": {
      const body = await readJSON<{ username?: string; password?: string }>(ctx.req);
      const accountID = body.username ? loginAccount(body.username.trim()) : null;
      if (!accountID || body.password !== MOCK_PASSWORD) {
        sendError(ctx.res, 403, "invalid_credentials", "invalid mock credentials");
        return true;
      }
      const accountInfo = ctx.state.accounts[accountID];
      setSessionCookie(ctx.res, accountID);
      const out: LoginResult = {
        user_id: `mock-${accountInfo.id}`,
        role: accountInfo.role,
        must_change_password: accountInfo.mustChangePassword,
      };
      sendJSON(ctx.res, 200, out);
      return true;
    }
    case "POST auth/logout":
      clearSessionCookie(ctx.res);
      sendJSON(ctx.res, 200, { ok: true });
      return true;
    default:
      return false;
  }
}

async function handleSession(ctx: SessionContext): Promise<boolean> {
  switch (route(ctx)) {
    case "GET me/servers":
      sendJSON(ctx.res, 200, { servers: visibleServers(ctx.state, ctx.account) });
      return true;
    case "GET me":
      sendJSON(ctx.res, 200, identity(ctx.account));
      return true;
    case "GET fleet":
      // Admin-tier, fleet-wide — mirrors the real adminOnly gate (a non-admin is
      // 403'd before the handler) so the cockpit's RequireAdmin path is exercised.
      if (ctx.account.role !== "admin") {
        sendError(ctx.res, 403, "forbidden", "admin account required");
        return true;
      }
      sendJSON(ctx.res, 200, { servers: fleetView(ctx.state) });
      return true;
    case "POST auth/change-password":
      ctx.account.mustChangePassword = false;
      sendJSON(ctx.res, 200, { ok: true });
      return true;
    case "GET backups":
      // Admin sees every archive; a user only worlds they formerly owned — mirrors
      // AllBackups vs BackupsForUser. The panel filters by server_name client-side.
      sendJSON(ctx.res, 200, {
        backups: ctx.state.backups.filter(
          (b) => ctx.account.role === "admin" || b.former_owner === ctx.account.id,
        ),
      });
      return true;
    case "POST servers":
      await createServerRoute(ctx);
      return true;
    case "POST account/link/start":
      sendJSON(ctx.res, 200, { linked: ctx.account.linked });
      return true;
    case "POST account/link/verify":
      await verifyLinkRoute(ctx);
      return true;
    default:
      if (await handleImageRoute(ctx)) return true;
      return await handleServerRoute(ctx);
  }
}

async function handleImageRoute(ctx: SessionContext): Promise<boolean> {
  if (ctx.parts[2] !== "images") return false;

  // GET /api/v1/images
  if (is("GET", ctx) && ctx.parts.length === 3) {
    sendJSON(ctx.res, 200, { images: ctx.state.images });
    return true;
  }

  // POST /api/v1/images (add image)
  if (is("POST", ctx) && ctx.parts.length === 3) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const body = await readJSON<{ image_ref?: string }>(ctx.req);
    const ref = body.image_ref?.trim();
    if (!ref) {
      sendError(ctx.res, 400, "bad_request", "image_ref is required");
      return true;
    }
    // Check if already exists in whitelist
    let img = ctx.state.images.find((i) => i.image_ref === ref);
    if (img) {
      img.enabled = true;
    } else {
      img = { image_ref: ref, enabled: true, source: "external" };
      ctx.state.images.unshift(img);
    }
    sendJSON(ctx.res, 201, img);
    return true;
  }

  // DELETE /api/v1/images (remove image)
  if (is("DELETE", ctx) && ctx.parts.length === 3) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const url = new URL(ctx.req.url ?? "/", "http://localhost");
    const ref = url.searchParams.get("ref");
    if (!ref) {
      sendError(ctx.res, 400, "bad_request", "ref query parameter is required");
      return true;
    }
    const idx = ctx.state.images.findIndex((i) => i.image_ref === ref);
    if (idx < 0) {
      sendError(ctx.res, 404, "not_found", "image not found");
      return true;
    }
    ctx.state.images.splice(idx, 1);
    ctx.res.statusCode = 204;
    ctx.res.end();
    return true;
  }

  // POST /api/v1/images/build (trigger build)
  if (is("POST", ctx) && ctx.parts[3] === "build" && ctx.parts.length === 4) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const body = await readJSON<{ image_ref?: string; dockerfile?: string; context_ref?: string; base_image?: string }>(ctx.req);
    if (!body.image_ref || !body.dockerfile || !body.context_ref) {
      sendError(ctx.res, 400, "bad_request", "image_ref, dockerfile, and context_ref are required");
      return true;
    }
    const newBuild: Build = {
      id: `bld-${Date.now()}`,
      image_ref: body.image_ref.trim(),
      status: "building",
      dockerfile: body.dockerfile,
      context_ref: body.context_ref.trim(),
      base_image: body.base_image?.trim(),
      requested_by: ctx.account.email,
      created_at: new Date().toISOString(),
    };
    ctx.state.builds.unshift(newBuild);

    // Mock build progression in a timeout
    setTimeout(() => {
      const b = ctx.state.builds.find((x) => x.id === newBuild.id);
      if (b && b.status === "building") {
        b.status = "succeeded";
        b.finished_at = new Date().toISOString();
        // Add to whitelist images
        if (!ctx.state.images.some((i) => i.image_ref === b.image_ref)) {
          ctx.state.images.unshift({ image_ref: b.image_ref, enabled: true, source: "built" });
        }
      }
    }, 15000); // Succeeded after 15 seconds

    sendJSON(ctx.res, 202, newBuild);
    return true;
  }

  // GET /api/v1/images/build (list builds)
  if (is("GET", ctx) && ctx.parts[3] === "build" && ctx.parts.length === 4) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    sendJSON(ctx.res, 200, { builds: ctx.state.builds });
    return true;
  }

  // GET /api/v1/images/build/{id} (get build)
  if (is("GET", ctx) && ctx.parts[3] === "build" && ctx.parts[4] && ctx.parts.length === 5) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const build = ctx.state.builds.find((b) => b.id === ctx.parts[4]);
    if (!build) {
      sendError(ctx.res, 404, "not_found", "build not found");
      return true;
    }
    sendJSON(ctx.res, 200, build);
    return true;
  }

  // POST /api/v1/images/build/{id}/cancel (cancel build)
  if (is("POST", ctx) && ctx.parts[3] === "build" && ctx.parts[5] === "cancel" && ctx.parts.length === 6) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const buildID = ctx.parts[4];
    const build = ctx.state.builds.find((b) => b.id === buildID);
    if (!build) {
      sendError(ctx.res, 404, "not_found", "build not found");
      return true;
    }
    if (build.status === "succeeded" || build.status === "failed" || build.status === "cancelled") {
      sendError(ctx.res, 409, "already_terminal", "build already terminal");
      return true;
    }
    build.status = "cancelled";
    build.finished_at = new Date().toISOString();
    sendJSON(ctx.res, 200, build);
    return true;
  }

  // GET /api/v1/images/build/{id}/logs (SSE logs stream)
  if (is("GET", ctx) && ctx.parts[3] === "build" && ctx.parts[5] === "logs" && ctx.parts.length === 6) {
    if (ctx.account.role !== "admin") {
      sendError(ctx.res, 403, "forbidden", "admin account required");
      return true;
    }
    const buildID = ctx.parts[4];
    const build = ctx.state.builds.find((b) => b.id === buildID);
    if (!build) {
      sendError(ctx.res, 404, "not_found", "build not found");
      return true;
    }
    streamBuildLogs(ctx.req, ctx.res, buildID);
    return true;
  }

  return false;
}

function streamBuildLogs(
  req: IncomingMessage,
  res: ServerResponse,
  buildID: string
): void {
  const lines = [
    `[INFO] [Kaniko] Starting build for ID: ${buildID}`,
    "[INFO] [Kaniko] Pulling base image library/postgres:15",
    "[INFO] [Kaniko] Successfully pulled base image",
    "[INFO] [Kaniko] Executing: RUN echo 'setup'",
    "[INFO] [Kaniko] Pushing image to registry.felis.svc:5000",
    "[INFO] [Trivy] Starting security scan...",
    "[INFO] [Trivy] Scanning registry.felis.svc:5000/image",
    "[INFO] [Trivy] No critical vulnerabilities found. Scan PASSED.",
    `[INFO] [System] Build succeeded for ${buildID}`,
  ];
  let i = 0;

  res.writeHead(200, {
    "Content-Type": "text/event-stream",
    "Cache-Control": "no-cache",
    Connection: "keep-alive",
  });
  res.write(": connected\n\n");

  const timer = setInterval(() => {
    if (i < lines.length) {
      res.write(`data: ${lines[i]}\n\n`);
      i++;
    } else {
      clearInterval(timer);
    }
  }, 1000);

  req.on("close", () => clearInterval(timer));
}

async function createServerRoute(ctx: SessionContext): Promise<void> {
  if (ctx.account.role !== "admin") {
    sendError(ctx.res, 403, "forbidden", "admin account required");
    return;
  }

  const body = await readJSON<Partial<CreateServerRequest>>(ctx.req);
  const created = createServer(ctx.state, ctx.account.id, body);
  if (typeof created === "string") {
    sendCreateError(ctx.res, created);
    return;
  }
  sendJSON(ctx.res, 201, {
    name: created.name,
    subdomain: created.subdomain,
    desiredState: created.desiredState,
  });
}

async function verifyLinkRoute(ctx: SessionContext): Promise<void> {
  const body = await readJSON<{ code?: string }>(ctx.req);
  if (body.code?.trim().toUpperCase() !== MOCK_LINK_CODE) {
    sendError(ctx.res, 400, "invalid_code", "invalid mock link code");
    return;
  }
  ctx.account.linked = true;
  sendJSON(ctx.res, 200, { linked: true, mc_uuid: MC_UUID });
}

async function handleServerRoute(ctx: SessionContext): Promise<boolean> {
  if (ctx.parts[2] !== "servers" || !ctx.parts[3]) return false;

  const serverInfo = findServer(ctx.state, decodeURIComponent(ctx.parts[3]));
  if (!serverInfo) {
    sendError(ctx.res, 404, "not_found", "server not found");
    return true;
  }
  if (!canSee(ctx.account, serverInfo)) {
    sendError(ctx.res, 403, "forbidden", "server is not visible to this account");
    return true;
  }

  if (is("GET", ctx) && ctx.parts[4] === "status") {
    sendJSON(ctx.res, 200, projectServer(serverInfo, ctx.account));
    return true;
  }
  if (is("GET", ctx) && ctx.parts[4] === "console") {
    if (!canManage(ctx.account, serverInfo)) {
      sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
      return true;
    }
    streamConsole(ctx.req, ctx.res, serverInfo);
    return true;
  }
  if (is("POST", ctx) && ctx.parts[4] === "wake") {
    if (!canManage(ctx.account, serverInfo)) {
      sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
      return true;
    }
    setPhase(serverInfo, "Starting");
    sendJSON(ctx.res, 200, { name: serverInfo.name, desiredState: "Running" });
    return true;
  }
  if (is("POST", ctx) && ctx.parts[4] === "stop") {
    if (!canManage(ctx.account, serverInfo)) {
      sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
      return true;
    }
    setPhase(serverInfo, "Stopped");
    sendJSON(ctx.res, 200, { name: serverInfo.name, desiredState: "Stopped" });
    return true;
  }
  if (is("POST", ctx) && ctx.parts[4] === "command") {
    if (!canManage(ctx.account, serverInfo)) {
      sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
      return true;
    }
    handleCommandMock(ctx, serverInfo);
    return true;
  }
  if (is("POST", ctx) && ctx.parts[4] === "claim") {
    claimServer(ctx, serverInfo);
    return true;
  }
  if (is("POST", ctx) && ctx.parts[4] === "restore-backup") {
    return await handleRestoreBackupMock(ctx, serverInfo);
  }
  if (ctx.parts[4] === "access") {
    return handleAccessMock(ctx, serverInfo);
  }

  return false;
}

// handleRestoreBackupMock mirrors the backend's restore authorization order
// (handlers_backups.go): owner-or-admin → specific backup by id or latest present
// backup else 404 no_backup → non-admin former-owner match → stopped gate else
// 409 not_stopped → 202.
async function handleRestoreBackupMock(ctx: SessionContext, serverInfo: MockServer): Promise<boolean> {
  if (!canManage(ctx.account, serverInfo)) {
    sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
    return true;
  }
  let backupId: string | undefined;
  try {
    const body = await readJSON<{ backup_id?: string }>(ctx.req);
    backupId = body.backup_id;
  } catch (e) {
    // Ignore if body is empty or unparsable
  }

  let backup: any = null;
  if (backupId) {
    backup = ctx.state.backups.find((b) => b.id === backupId && b.server_name === serverInfo.name && b.status === "present");
    if (!backup) {
      sendError(ctx.res, 404, "no_backup", "no restorable backup exists for this server");
      return true;
    }
  } else {
    const latest = ctx.state.backups
      .filter((b) => b.server_name === serverInfo.name && b.status === "present")
      .sort((a, b) => Date.parse(b.created_at) - Date.parse(a.created_at))[0];
    if (!latest) {
      sendError(ctx.res, 404, "no_backup", "no restorable backup exists for this server");
      return true;
    }
    backup = latest;
  }

  // Non-admins may restore only a world they formerly owned (spec §466).
  if (ctx.account.role !== "admin" && backup.former_owner !== ctx.account.id) {
    sendError(ctx.res, 403, "forbidden", "not the former owner of this world");
    return true;
  }
  // The world PVC must be free — a running/starting server still holds it.
  if (serverInfo.phase !== "Stopped") {
    sendError(ctx.res, 409, "not_stopped", "stop the server before restoring a backup");
    return true;
  }
  sendJSON(ctx.res, 202, { name: serverInfo.name, status: "restoring", backup_id: backup.id });
  return true;
}

function accessFor(state: MockState, name: string): AccessState {
  let entry = state.access[name];
  if (!entry) {
    entry = { whitelist: [], banned: [], online: [] };
    state.access[name] = entry;
  }
  return entry;
}

function whitelistOutput(players: string[]): string {
  if (players.length === 0) return "There are no whitelisted players";
  return `There are ${players.length} whitelisted player(s): ${players.join(", ")}`;
}

function listOutput(online: string[], max: number): string {
  const head = `There are ${online.length} of a max of ${max} players online:`;
  return online.length === 0 ? head : `${head} ${online.join(", ")}`;
}

// banlistOutput reproduces vanilla's multiline "banlist" reply: a header line then
// one "<name> was banned by <source>: <reason>" line per ban. The panel's parser
// (parseBanlistOutput) keys on the " was banned by " marker, so this exercises the
// real shape — header + reasons that carry their own colons and spaces — end to end.
function banlistOutput(banned: string[]): string {
  if (banned.length === 0) return "There are no bans.";
  const head = `There are ${banned.length} ban(s):`;
  const lines = banned.map((p) => `${p} was banned by Server: Banned by an operator.`);
  return [head, ...lines].join("\n");
}

// handleAccessMock mirrors issueAccessCommand's two gates — owner/admin AND the
// server being Running (RCON) — before dispatching the whitelist/ban routes. The GET
// whitelist read is behind the SAME Running gate as the writes, exactly as the real
// readiness check covers it (409 not_running on a cold server).
function handleAccessMock(ctx: SessionContext, serverInfo: MockServer): boolean {
  if (!canManage(ctx.account, serverInfo)) {
    sendError(ctx.res, 403, "forbidden", "server is not owned by this account");
    return true;
  }
  if (serverInfo.phase !== "Running") {
    sendError(
      ctx.res,
      409,
      "not_running",
      "server is not running; wake it before managing access",
    );
    return true;
  }

  const sub = ctx.parts[5];
  const access = accessFor(ctx.state, serverInfo.name);

  if (is("GET", ctx) && sub === "whitelist") {
    sendJSON(ctx.res, 200, {
      name: serverInfo.name,
      players: [...access.whitelist],
      output: whitelistOutput(access.whitelist),
    });
    return true;
  }
  if (is("POST", ctx) && sub === "whitelist") {
    void handleListMutation(ctx, serverInfo, access, "whitelist");
    return true;
  }
  if (is("GET", ctx) && sub === "players") {
    const max = serverInfo.maxPlayers ?? 0;
    sendJSON(ctx.res, 200, {
      name: serverInfo.name,
      online: access.online.length,
      max,
      players: [...access.online],
      output: listOutput(access.online, max),
    });
    return true;
  }
  if (is("POST", ctx) && sub === "kick") {
    void handleKickMock(ctx, serverInfo, access);
    return true;
  }
  if (is("GET", ctx) && sub === "ban") {
    sendJSON(ctx.res, 200, {
      name: serverInfo.name,
      players: [...access.banned],
      output: banlistOutput(access.banned),
    });
    return true;
  }
  if (is("POST", ctx) && sub === "ban") {
    void handleListMutation(ctx, serverInfo, access, "ban");
    return true;
  }

  return false;
}

// handleKickMock backs POST .../access/kick: charset-validate the player, drop them
// from the online roster (so a reload reflects it), and echo {name, player, output}.
async function handleKickMock(
  ctx: SessionContext,
  serverInfo: MockServer,
  access: AccessState,
): Promise<void> {
  const body = await readJSON<{ player?: string }>(ctx.req);
  const player = body.player?.trim() ?? "";
  if (!PLAYER_NAME.test(player)) {
    sendError(ctx.res, 400, "bad_request", "invalid player name");
    return;
  }
  const i = access.online.indexOf(player);
  if (i >= 0) access.online.splice(i, 1);
  sendJSON(ctx.res, 200, {
    name: serverInfo.name,
    player,
    output: `[mock] kick ${player}`,
  });
}

// handleListMutation backs both POST .../access/whitelist (add|remove) and
// POST .../access/ban (ban|pardon): the same structured {action, player} shape with
// a charset-validated player, echoing back {name, action, player, output}.
async function handleListMutation(
  ctx: SessionContext,
  serverInfo: MockServer,
  access: AccessState,
  kind: "whitelist" | "ban",
): Promise<void> {
  const body = await readJSON<{ action?: string; player?: string }>(ctx.req);
  const player = body.player?.trim() ?? "";
  if (!PLAYER_NAME.test(player)) {
    sendError(ctx.res, 400, "bad_request", "invalid player name");
    return;
  }

  const list = kind === "whitelist" ? access.whitelist : access.banned;
  const addAction = kind === "whitelist" ? "add" : "ban";
  const removeAction = kind === "whitelist" ? "remove" : "pardon";

  if (body.action === addAction) {
    if (!list.includes(player)) list.push(player);
    // A ban also removes the player from the live server, so drop them from the
    // online roster too — the real "ban" kicks them as a side effect.
    if (kind === "ban") {
      const oi = access.online.indexOf(player);
      if (oi >= 0) access.online.splice(oi, 1);
    }
  } else if (body.action === removeAction) {
    const i = list.indexOf(player);
    if (i >= 0) list.splice(i, 1);
  } else {
    sendError(ctx.res, 400, "bad_request", "unknown action");
    return;
  }

  sendJSON(ctx.res, 200, {
    name: serverInfo.name,
    action: body.action,
    player,
    output: `[mock] ${body.action} ${player}`,
  });
}

async function handleCommandMock(
  ctx: SessionContext,
  serverInfo: MockServer,
): Promise<void> {
  const body = await readJSON<{ command?: string }>(ctx.req);
  const cmd = body.command?.trim();
  if (!cmd) {
    sendError(ctx.res, 400, "bad_request", "command is required");
    return;
  }
  if (serverInfo.phase !== "Running") {
    sendError(
      ctx.res,
      409,
      "conflict",
      "server is not running; wake it before sending console commands",
    );
    return;
  }
  const reply = mockCommandReply(cmd);
  sendJSON(ctx.res, 200, { output: reply });
}

function mockCommandReply(cmd: string): string {
  const lower = cmd.toLowerCase();
  if (lower === "list") return "There are 2 of a max 20 players online: mock_player, test_player";
  if (lower === "tps" || lower === "forge tps") return "TPS from last 5s, 10s, 1m, 5m, 15m: 20.00, 20.00, *19.87, 19.95, 19.98";
  if (cmd.startsWith("say ")) return `[mock_server] ${cmd.slice(4)}`;
  if (lower === "help") return "--- Showing help ---\n/felis\n/msg\n/list\n/rules";
  return `[mock] command "${cmd}" executed`;
}

function claimServer(ctx: SessionContext, serverInfo: MockServer): void {
  if (serverInfo.owner !== null) {
    sendError(ctx.res, 409, "already_claimed", "server is already claimed");
    return;
  }
  if (!ctx.account.linked) {
    sendError(ctx.res, 412, "not_linked", "link a Minecraft account first");
    return;
  }
  serverInfo.owner = ctx.account.id;
  setPhase(serverInfo, "Starting");
  sendJSON(ctx.res, 200, { name: serverInfo.name, claimed: true });
}

function streamConsole(
  req: IncomingMessage,
  res: ServerResponse,
  serverInfo: MockServer,
): void {
  const lines = [
    `[12:00:00] [Server thread/INFO]: Starting ${serverInfo.displayName ?? serverInfo.name}`,
    "[12:00:01] [Server thread/INFO]: Loading properties",
    "[12:00:02] [Server thread/WARN]: Mock world uses in-memory state only",
    "[12:00:03] [Server thread/INFO]: Preparing spawn area: 100%",
    "[12:00:04] [Server thread/INFO]: Done (4.123s)! For help, type \"help\"",
  ];
  let i = 0;

  res.writeHead(200, {
    "Content-Type": "text/event-stream",
    "Cache-Control": "no-cache",
    Connection: "keep-alive",
  });
  res.write(": connected\n\n");

  const timer = setInterval(() => {
    res.write(`data: ${lines[i % lines.length]}\n\n`);
    i++;
  }, 900);

  req.on("close", () => clearInterval(timer));
}

export function mockApiPlugin(): Plugin {
  let state = initialState();

  return {
    name: "felis-mock-api",
    transformIndexHtml() {
      return [
        { tag: "style", attrs: { id: "felis-mock-login-style" }, children: LOGIN_HINT_STYLE },
        { tag: "script", children: LOGIN_HINT_SCRIPT },
      ];
    },
    configureServer(server) {
      server.config.logger.info(mockStartupMessage());
      server.middlewares.use(async (req, res, next) => {
        const url = new URL(req.url ?? "/", "http://localhost");
        const method = req.method ?? "GET";
        const parts = url.pathname.split("/").filter(Boolean);

        if (method === "GET" && url.pathname === "/config.json") {
          sendJSON(res, 200, { apiBase: API_BASE, rootDomain: ROOT_DOMAIN });
          return;
        }
        if (parts[0] !== "api" || parts[1] !== "v1") {
          next();
          return;
        }
        if (method === "POST" && parts[2] === "__mock" && parts[3] === "reset") {
          state = initialState();
          server.config.logger.info("  Felis mock API: state reset");
          sendJSON(res, 200, { ok: true });
          return;
        }

        const ctx: RequestContext = { req, res, state, method, parts };
        try {
          if (await handlePublic(ctx)) return;

          const accountInfo = readAccount(req, state);
          if (!accountInfo) {
            sendError(res, 401, "unauthenticated", "mock session required");
            return;
          }
          if (await handleSession({ ...ctx, account: accountInfo })) return;

          sendError(res, 404, "not_found", "mock route not found");
        } catch (err) {
          sendError(res, 500, "mock_error", err instanceof Error ? err.message : "mock error");
        }
      });
    },
  };
}