import fs from 'node:fs/promises';
import os from 'node:os';
import path from 'node:path';
import initSqlJs from 'sql.js';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';
import { WORLD_TIME_SCALE } from '@/lib/worldClock';
import { STARTING_CASH, STARTING_CLOCK_MS, STARTING_REPUTATION } from '@/lib/game/seed';
import { openGameDb, persist } from './client';
import { getLocalPlayer, updateLocalPlayerEconomy } from './localPlayer';
import * as schema from './schema';

// v1.0.0 (ISS-105): the local player row every fresh/migrated world must carry.
const LOCAL_PLAYER_ROW = { id: 'local', provider: 'local', username: 'kamilkrzywda' };

// The v0.6.0 DDL — used to build a "legacy" DB file for the migration test.
const LEGACY_DDL = `
CREATE TABLE planes (
  id TEXT PRIMARY KEY NOT NULL,
  model TEXT NOT NULL,
  status TEXT NOT NULL,
  fuel REAL NOT NULL,
  max_fuel REAL NOT NULL,
  location_icao TEXT NOT NULL,
  contract_id TEXT,
  lat REAL NOT NULL,
  lon REAL NOT NULL
);
CREATE TABLE contracts (
  id TEXT PRIMARY KEY NOT NULL,
  origin_icao TEXT NOT NULL,
  dest_icao TEXT NOT NULL,
  reward REAL NOT NULL,
  cargo_type TEXT NOT NULL,
  cargo_count INTEGER NOT NULL,
  deadline_sim_time INTEGER NOT NULL,
  status TEXT NOT NULL,
  plane_id TEXT,
  created_sim_time INTEGER NOT NULL
);
CREATE TABLE account (
  cash REAL NOT NULL,
  reputation REAL NOT NULL
);
CREATE TABLE sim_state (
  clock_ms INTEGER NOT NULL,
  time_scale REAL NOT NULL,
  paused INTEGER NOT NULL
);
`;

// The v0.11.0 DDL — the last schema before the packages pivot; used to build a
// "pre-v0.12.0" DB file for the migration test (has departure_sim_time +
// contract_id, has contracts, no packages/dest_icao).
const PRE_V12_DDL = `
CREATE TABLE planes (
  id TEXT PRIMARY KEY NOT NULL,
  model TEXT NOT NULL,
  status TEXT NOT NULL,
  fuel REAL NOT NULL,
  max_fuel REAL NOT NULL,
  location_icao TEXT NOT NULL,
  contract_id TEXT,
  lat REAL NOT NULL,
  lon REAL NOT NULL,
  departure_sim_time INTEGER
);
CREATE TABLE contracts (
  id TEXT PRIMARY KEY NOT NULL,
  origin_icao TEXT NOT NULL,
  dest_icao TEXT NOT NULL,
  reward REAL NOT NULL,
  cargo_type TEXT NOT NULL,
  cargo_count INTEGER NOT NULL,
  deadline_sim_time INTEGER NOT NULL,
  status TEXT NOT NULL,
  plane_id TEXT,
  created_sim_time INTEGER NOT NULL
);
CREATE TABLE account (
  cash REAL NOT NULL,
  reputation REAL NOT NULL
);
CREATE TABLE sim_state (
  clock_ms INTEGER NOT NULL,
  time_scale REAL NOT NULL,
  paused INTEGER NOT NULL,
  last_real_tick_ms INTEGER NOT NULL DEFAULT 0
);
`;

let dir: string;

beforeAll(async () => {
  dir = await fs.mkdtemp(path.join(os.tmpdir(), 'flight-db-'));
});

afterAll(async () => {
  await fs.rm(dir, { recursive: true, force: true });
});

describe('openGameDb', () => {
  it('seeds a fresh DB file on first open and persists it to disk', async () => {
    const file = path.join(dir, 'fresh.db');
    const inst = await openGameDb(file);

    const planes = await inst.db.select().from(schema.planes);
    expect(planes).toHaveLength(1);
    expect(planes[0].id).toBe('plane-starter');
    expect(planes[0].status).toBe('available');
    expect(planes[0].locationIcao).toBe('EDDF'); // Frankfurt hub from the CSV
    expect(planes[0].fuel).toBe(planes[0].maxFuel);

    const packages = await inst.db.select().from(schema.packages);
    expect(packages.length).toBeGreaterThanOrEqual(8);
    expect(packages.every((p) => p.status === 'open')).toBe(true);

    // v1.0.0 (ISS-105): the singleton economy is now a seeded local player row…
    expect(await getLocalPlayer(inst)).toEqual({ ...LOCAL_PLAYER_ROW, cash: STARTING_CASH, reputation: STARTING_REPUTATION });
    // …and fresh DBs never create an `account` table.
    const tables = new Set(
      inst.raw.exec("SELECT name FROM sqlite_master WHERE type='table'")[0].values.map((r) => String(r[0])),
    );
    expect(tables.has('account')).toBe(false);
    const sim = (await inst.db.select().from(schema.simState))[0];
    // ISS-117: fresh worlds start at the year-2000 game clock with the fixed world rate.
    expect(sim?.clockMs).toBe(STARTING_CLOCK_MS);
    expect(sim?.timeScale).toBe(WORLD_TIME_SCALE);

    // The seed was durably written: the file exists and is non-empty.
    const st = await fs.stat(file);
    expect(st.size).toBeGreaterThan(0);
  });

  it('does not re-seed an existing DB — state survives reopen', async () => {
    const file = path.join(dir, 'reopen.db');
    const first = await openGameDb(file);
    const packages1 = (await first.db.select().from(schema.packages)).map((p) => p.id).sort();
    const player1 = await getLocalPlayer(first);

    // Simulate a process restart: brand-new instance over the same file.
    const second = await openGameDb(file);
    const packages2 = (await second.db.select().from(schema.packages)).map((p) => p.id).sort();
    expect(packages2).toEqual(packages1);
    expect(await getLocalPlayer(second)).toEqual(player1);
  });

  it('persist() durably saves writes made after open', async () => {
    const file = path.join(dir, 'write.db');
    const inst = await openGameDb(file);

    await updateLocalPlayerEconomy(inst, { cash: 12345 });
    await persist(inst);

    // A fresh instance over the same file sees the update.
    const reloaded = await openGameDb(file);
    expect((await getLocalPlayer(reloaded)).cash).toBe(12345);
  });

  it('migrates a pre-v0.7.0 database: adds new columns and fixes last_real_tick_ms', async () => {
    // Build a legacy file with the v0.6.0 schema (no departure_sim_time / last_real_tick_ms).
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(LEGACY_DDL);
    raw.exec(`INSERT INTO planes VALUES ('plane-starter', 'atr72', 'available', 6300, 6300, 'EDDF', NULL, 50.03, 8.57)`);
    raw.exec(`INSERT INTO account VALUES (20000, 10)`);
    // time_scale = 50 on purpose: the v0.30.0 backfill must copy it into last_selected_time_scale.
    raw.exec('INSERT INTO sim_state VALUES (1750000000000, 50, 0)');
    const file = path.join(dir, 'legacy.db');
    await fs.writeFile(file, Buffer.from(raw.export()));

    const inst = await openGameDb(file);

    // Not re-seeded (the legacy account row was migrated into the local player)…
    expect((await getLocalPlayer(inst)).cash).toBe(20000);
    // …but the new columns exist and are usable…
    const plane = (await inst.db.select().from(schema.planes))[0];
    expect(plane?.departureSimTime ?? null).toBeNull();
    const sim = (await inst.db.select().from(schema.simState))[0];
    expect(sim?.clockMs).toBe(1_750_000_000_000);
    // …and the ALTER-default 0 was fixed up to a real timestamp so the first
    // tick-on-read resumes cleanly instead of taking one clamped catch-up jump.
    expect(sim?.lastRealTickMs).toBeGreaterThan(0);
    // v0.30.0 (ISS-057): the new column backfilled to the legacy row's OWN speed, not the default.
    expect(sim?.timeScale).toBe(50);
    expect(sim?.lastSelectedTimeScale).toBe(50);
  });

  it('migrates a pre-v0.12.0 database: wipes contracts, grounds planes, preserves account + clock', async () => {
    // Build a v0.11.0 file with an IN-FLIGHT plane (old dispatch state) and live contracts.
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(PRE_V12_DDL);
    raw.exec(
      `INSERT INTO planes VALUES ('plane-starter', 'atr72', 'flying', 4000, 6300, 'EDDF', 'c-1', 50.03, 8.57, 1789000000000)`,
    );
    raw.exec(
      `INSERT INTO contracts VALUES ('c-1', 'EDDF', 'LEMD', 5000, 'Mail', 4, 1789100000000, 'accepted', 'plane-starter', 1788900000000)`,
    );
    raw.exec(`INSERT INTO account VALUES (54020.34, 62.57)`);
    raw.exec('INSERT INTO sim_state VALUES (1789706016605, 1, 0, 1789718713288)');
    const file = path.join(dir, 'pre-v12.db');
    await fs.writeFile(file, Buffer.from(raw.export()));

    const inst = await openGameDb(file);

    // Wallet (migrated into the local player) + sim clock survive byte-identical…
    expect(await getLocalPlayer(inst)).toEqual({ ...LOCAL_PLAYER_ROW, cash: 54020.34, reputation: 62.57 });
    expect((await inst.db.select().from(schema.simState))[0]?.clockMs).toBe(1_789_706_016_605);

    // …the in-flight plane is reset to GROUNDED at its locationIcao (it "lands" back where it took off)…
    const plane = (await inst.db.select().from(schema.planes))[0];
    expect(plane.status).toBe('available');
    expect(plane.locationIcao).toBe('EDDF'); // unchanged — grounded AT the origin
    expect(plane.departureSimTime ?? null).toBeNull();
    expect(plane.destIcao ?? null).toBeNull();

    // …old contract data is wiped and the packages table exists (empty until spawn reseeds)…
    let contractsGone = false;
    try {
      inst.raw.exec('SELECT COUNT(*) FROM contracts');
    } catch {
      contractsGone = true;
    }
    expect(contractsGone).toBe(true);
    const packages = await inst.db.select().from(schema.packages);
    expect(packages).toHaveLength(0);

    // …and the orphaned contract_id column is dropped from planes.
    const cols = new Set(inst.raw.exec('PRAGMA table_info(planes)')[0].values.map((r) => String(r[1])));
    expect(cols.has('contract_id')).toBe(false);
    expect(cols.has('dest_icao')).toBe(true);
  });

  // v0.71.0: the seeded admin row — hash-only, idempotent across every open().
  const ADMIN_HASH = '339149a14282ff3a2ed94534f9722aa4$abaf94cf073c5aafc892b4a39dce97aaf53ab6f7c662a588815bda1bc1771caf';
  // The v0.71.0 digest — computed with different scrypt parameters than verifyPassword(),
  // so it never verified; production DBs seeded by that version carry exactly this value.
  const LEGACY_HASH = '8dbed630b49a15073e8be571367c1858$0e5207dae2e3c813a7172a5f610fd47a90e8ff17513180ab1e0a7779c3766ef0';

  it('seeds exactly one admin user on first open and never duplicates on reopen', async () => {
    const file = path.join(dir, 'admin-seed.db');
    const inst = await openGameDb(file);

    let rows = inst.raw.exec("SELECT id, username, password_hash, admin FROM users WHERE username = 'kamilkrzywda'");
    expect(rows[0].values).toHaveLength(1);
    expect(rows[0].values[0]).toEqual(['admin-kamilkrzywda', 'kamilkrzywda', ADMIN_HASH, 1]);

    // Simulate a process restart: brand-new instance over the same file.
    const second = await openGameDb(file);
    rows = second.raw.exec('SELECT COUNT(*) FROM users');
    expect(Number(rows[0].values[0][0])).toBe(1);
  });

  it('seeds the admin into a legacy DB that predates the users table', async () => {
    // A pre-v0.71.0 file: no users/sessions tables at all (the v0.6.0 DDL has none).
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(LEGACY_DDL);
    raw.exec(`INSERT INTO planes VALUES ('plane-starter', 'atr72', 'available', 6300, 6300, 'EDDF', NULL, 50.03, 8.57)`);
    raw.exec(`INSERT INTO account VALUES (20000, 10)`);
    raw.exec('INSERT INTO sim_state VALUES (1750000000000, 50, 0)');
    const file = path.join(dir, 'legacy-admin.db');
    await fs.writeFile(file, Buffer.from(raw.export()));

    const inst = await openGameDb(file);
    const rows = inst.raw.exec("SELECT id, username, admin FROM users WHERE username = 'kamilkrzywda'");
    expect(rows[0].values).toHaveLength(1);
    expect(rows[0].values[0]).toEqual(['admin-kamilkrzywda', 'kamilkrzywda', 1]);
    // The game world is untouched by the seed (its account row migrated to the local player).
    expect((await getLocalPlayer(inst)).cash).toBe(20000);
  });

  it('rotates a v0.71.0 legacy admin digest on open (idempotent)', async () => {
    // A file exactly as v0.71.0 left production: an admin row carrying the old, incompatible digest.
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(`CREATE TABLE users (
      id TEXT PRIMARY KEY NOT NULL,
      username TEXT NOT NULL UNIQUE,
      password_hash TEXT NOT NULL,
      admin INTEGER NOT NULL DEFAULT 0,
      created_at INTEGER NOT NULL
    )`);
    raw.run('INSERT INTO users VALUES (?, ?, ?, 1, ?)', [
      'admin-kamilkrzywda',
      'kamilkrzywda',
      LEGACY_HASH,
      Date.now(),
    ]);
    const file = path.join(dir, 'admin-rotate.db');
    await fs.writeFile(file, Buffer.from(raw.export()));

    // First open heals the row to the current digest…
    const first = await openGameDb(file);
    let rows = first.raw.exec("SELECT password_hash FROM users WHERE id = 'admin-kamilkrzywda'");
    expect(rows[0].values).toHaveLength(1);
    expect(rows[0].values[0][0]).toBe(ADMIN_HASH);

    // …and a second open is a no-op (idempotent rotation).
    const second = await openGameDb(file);
    rows = second.raw.exec("SELECT password_hash FROM users WHERE id = 'admin-kamilkrzywda'");
    expect(rows[0].values[0][0]).toBe(ADMIN_HASH);
  });

  it('does not re-run the v0.12 plane reset on later opens (migration is one-shot)', async () => {
    const file = path.join(dir, 'pre-v12-reopen.db');
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(PRE_V12_DDL);
    raw.exec(
      `INSERT INTO planes VALUES ('plane-starter', 'atr72', 'available', 6300, 6300, 'EDDF', NULL, 50.03, 8.57, NULL)`,
    );
    raw.exec(`INSERT INTO account VALUES (1000, 1)`);
    raw.exec('INSERT INTO sim_state VALUES (1789000000000, 1, 0, 1789000000000)');
    await fs.writeFile(file, Buffer.from(raw.export()));

    const first = await openGameDb(file); // migration runs here
    // Simulate post-migration play: the plane flies again.
    await first.db.update(schema.planes).set({ status: 'flying', destIcao: 'LEMD', departureSimTime: 1789000001000 });
    await persist(first);

    const second = await openGameDb(file); // must NOT ground the plane again
    const plane = (await second.db.select().from(schema.planes))[0];
    expect(plane.status).toBe('flying');
    expect(plane.destIcao).toBe('LEMD');
  });

  it('migrates a pre-v1.0.0 database: copies the singleton account into the local player and drops it', async () => {
    // Minimal legacy file — just an `account` table; open() creates everything else from DDL.
    const SQL = await initSqlJs();
    const raw = new SQL.Database();
    raw.exec(`CREATE TABLE account (cash REAL NOT NULL, reputation REAL NOT NULL)`);
    raw.exec(`INSERT INTO account VALUES (77123.45, 88.5)`);
    const file = path.join(dir, 'pre-v1.db');
    await fs.writeFile(file, Buffer.from(raw.export()));

    const inst = await openGameDb(file);
    expect(await getLocalPlayer(inst)).toEqual({ ...LOCAL_PLAYER_ROW, cash: 77123.45, reputation: 88.5 });
    let tables = new Set(
      inst.raw.exec("SELECT name FROM sqlite_master WHERE type='table'")[0].values.map((r) => String(r[0])),
    );
    expect(tables.has('account')).toBe(false);

    // Second open is a no-op (idempotent): the row survives unchanged, still exactly one player.
    const second = await openGameDb(file);
    expect(await getLocalPlayer(second)).toEqual({ ...LOCAL_PLAYER_ROW, cash: 77123.45, reputation: 88.5 });
    tables = new Set(
      second.raw.exec("SELECT name FROM sqlite_master WHERE type='table'")[0].values.map((r) => String(r[0])),
    );
    expect(tables.has('account')).toBe(false);
    expect(Number(second.raw.exec('SELECT COUNT(*) FROM players')[0].values[0][0])).toBe(1);
  });
});