import { describe, it, expect, afterEach } from 'vitest';
import { openDatabase, getDatabase, closeDatabase, getSchemaVersion, CURRENT_SCHEMA_VERSION } from '../database.js';
import fs from 'fs';
import path from 'path';
import os from 'os';

function tempDbPath(): string {
  return path.join(os.tmpdir(), `dflike-test-${Date.now()}-${Math.random().toString(36).slice(2)}.db`);
}

describe('database', () => {
  const dbPaths: string[] = [];

  function createTempDb(): string {
    const p = tempDbPath();
    dbPaths.push(p);
    return p;
  }

  afterEach(() => {
    try { closeDatabase(); } catch { /* ignore if not open */ }
    for (const p of dbPaths) {
      try { fs.unlinkSync(p); } catch { /* ignore */ }
      try { fs.unlinkSync(p + '-wal'); } catch { /* ignore */ }
      try { fs.unlinkSync(p + '-shm'); } catch { /* ignore */ }
    }
    dbPaths.length = 0;
  });

  it('creates a new database with all tables', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const db = getDatabase();

    // Query sqlite_master for all tables
    const tables = db.prepare("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name").all() as { name: string }[];
    const tableNames = tables.map(t => t.name);

    expect(tableNames).toContain('metadata');
    expect(tableNames).toContain('tiles');
    expect(tableNames).toContain('entities');
    expect(tableNames).toContain('components');
    expect(tableNames).toContain('relationships');
    expect(tableNames).toContain('bonds');
    expect(tableNames).toContain('narration_events');
    expect(tableNames).toContain('memory_events');
    expect(tableNames).toContain('stockpile_log');
    expect(tableNames).toContain('inventions');
  });

  it('sets schema_version in metadata', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const version = getSchemaVersion();
    expect(version).toBe(CURRENT_SCHEMA_VERSION);
    expect(version).toBe(3);
  });

  it('returns same db on multiple getDatabase calls', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const db1 = getDatabase();
    const db2 = getDatabase();
    expect(db1).toBe(db2);
  });

  it('throws if getDatabase called before openDatabase', () => {
    expect(() => getDatabase()).toThrow();
  });

  it('can reopen an existing database and read previously written data', () => {
    const dbPath = createTempDb();

    // First open: write some data
    openDatabase(dbPath);
    const db = getDatabase();
    db.prepare("INSERT INTO entities (id, type, name, x, y) VALUES (?, ?, ?, ?, ?)").run(1, 'npc', 'TestNPC', 10.5, 20.5);
    db.prepare("INSERT INTO tiles (x, y, terrain) VALUES (?, ?, ?)").run(0, 0, 3);
    closeDatabase();

    // Second open: read the data back
    openDatabase(dbPath);
    const db2 = getDatabase();
    const entity = db2.prepare("SELECT * FROM entities WHERE id = ?").get(1) as any;
    expect(entity.type).toBe('npc');
    expect(entity.name).toBe('TestNPC');
    expect(entity.x).toBe(10.5);
    expect(entity.y).toBe(20.5);

    const tile = db2.prepare("SELECT * FROM tiles WHERE x = 0 AND y = 0").get() as any;
    expect(tile.terrain).toBe(3);

    // Schema version should still be set
    expect(getSchemaVersion()).toBe(CURRENT_SCHEMA_VERSION);
  });

  it('uses WAL journal mode', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const db = getDatabase();
    const result = db.prepare("PRAGMA journal_mode").get() as any;
    expect(result.journal_mode).toBe('wal');
  });

  it('CURRENT_SCHEMA_VERSION is 3', () => {
    expect(CURRENT_SCHEMA_VERSION).toBe(3);
  });

  it('creates llm_call_log table in new databases', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const db = getDatabase();
    const tables = db.prepare("SELECT name FROM sqlite_master WHERE type='table'").all() as { name: string }[];
    expect(tables.map(t => t.name)).toContain('llm_call_log');
  });

  it('creates llm_tracking_enabled metadata in new databases', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    const db = getDatabase();
    const row = db.prepare("SELECT value FROM metadata WHERE key = 'llm_tracking_enabled'").get() as { value: string };
    expect(row.value).toBe('1');
  });

  it('closeDatabase allows reopening', () => {
    const dbPath = createTempDb();
    openDatabase(dbPath);
    closeDatabase();
    // Should not throw
    openDatabase(dbPath);
    expect(getDatabase()).toBeDefined();
  });
});