import Database from 'better-sqlite3';
import path from 'path';

export const DB_FILE = path.join(process.cwd(), 'ghostgrid.db');

/** App-generated primary key: `${prefix}-${epochMs}-${rand}` (e.g. `log-…`, `dev-…`). */
export const uid = (prefix: string) => `${prefix}-${Date.now()}-${Math.random().toString(36).slice(2, 7)}`;

console.log(`[Database] Connecting to SQLite database at: ${DB_FILE}`);
const db = new Database(DB_FILE);

db.pragma('journal_mode = WAL');

db.exec(`
  CREATE TABLE IF NOT EXISTS users (
    id            TEXT PRIMARY KEY,
    name          TEXT NOT NULL,
    role          TEXT NOT NULL DEFAULT 'User',
    email         TEXT NOT NULL UNIQUE,
    password_hash TEXT NOT NULL
  );

  CREATE TABLE IF NOT EXISTS devices (
    id             TEXT PRIMARY KEY,
    hostname       TEXT NOT NULL,
    ip             TEXT NOT NULL,
    location       TEXT NOT NULL,
    notes          TEXT,
    type           TEXT NOT NULL,
    status         TEXT NOT NULL,
    emergencySheet TEXT NOT NULL,
    lastCheckedAt  TEXT,
    cmkUrl         TEXT NOT NULL DEFAULT '',
    cmkHostname    TEXT NOT NULL DEFAULT ''
  );

  CREATE TABLE IF NOT EXISTS labs (
    id                          TEXT PRIMARY KEY,
    name                        TEXT NOT NULL,
    description                 TEXT NOT NULL,
    contactPerson               TEXT NOT NULL,
    location                    TEXT NOT NULL,
    deviceIds                   TEXT NOT NULL,
    topology                    TEXT NOT NULL,
    semaphoreSetupTemplateId    TEXT NOT NULL DEFAULT '',
    semaphoreTeardownTemplateId TEXT NOT NULL DEFAULT ''
  );

  CREATE TABLE IF NOT EXISTS bookings (
    id                       TEXT PRIMARY KEY,
    labId                    TEXT NOT NULL,
    userId                   TEXT NOT NULL,
    startDateTime            TEXT NOT NULL,
    endDateTime              TEXT NOT NULL,
    notes                    TEXT,
    status                   TEXT NOT NULL,
    notified                 INTEGER NOT NULL DEFAULT 0,
    emailSent                INTEGER NOT NULL DEFAULT 0,
    semaphoreSetupTriggered    INTEGER NOT NULL DEFAULT 0,
    semaphoreTeardownTriggered INTEGER NOT NULL DEFAULT 0,
    semaphoreSetupJobId        TEXT NOT NULL DEFAULT '',
    semaphoreTeardownJobId     TEXT NOT NULL DEFAULT ''
  );

  CREATE TABLE IF NOT EXISTS logs (
    id        TEXT PRIMARY KEY,
    timestamp TEXT NOT NULL,
    type      TEXT NOT NULL,
    message   TEXT NOT NULL,
    deviceId  TEXT,
    userId    TEXT
  );

  CREATE TABLE IF NOT EXISTS links (
    id          TEXT PRIMARY KEY,
    title       TEXT NOT NULL,
    url         TEXT NOT NULL,
    description TEXT NOT NULL DEFAULT '',
    category    TEXT NOT NULL DEFAULT '',
    color       TEXT NOT NULL DEFAULT 'emerald',
    createdBy   TEXT,
    createdAt   TEXT NOT NULL
  );

  CREATE TABLE IF NOT EXISTS settings (
    key        TEXT PRIMARY KEY,
    value      TEXT NOT NULL,
    updated_at TEXT DEFAULT (datetime('now'))
  );

  CREATE TABLE IF NOT EXISTS caddy (
    id            INTEGER PRIMARY KEY AUTOINCREMENT,
    hostname      TEXT NOT NULL,
    upstream      TEXT NOT NULL,
    tls           INTEGER NOT NULL DEFAULT 1,
    compress      INTEGER NOT NULL DEFAULT 1,
    redirect      TEXT NOT NULL DEFAULT '',
    created_at    TEXT DEFAULT (datetime('now'))
  );
`);

// Idempotent migrations — SQLite throws on duplicate column; the catch makes them safe to re-run.
try { db.prepare("ALTER TABLE labs ADD COLUMN scope TEXT NOT NULL DEFAULT 'global'").run(); } catch {}
try { db.prepare("ALTER TABLE labs ADD COLUMN ownerId TEXT NOT NULL DEFAULT ''").run(); } catch {}

// Seed default settings — INSERT OR IGNORE writes a key only if it is absent.
const DEFAULT_SETTINGS: Record<string, string> = {
  azure_enabled: 'false',
  azure_client_id: '',
  azure_tenant_id: '',
  azure_client_secret: '',
  azure_redirect_uri: '',
  azure_allowed_group: '',
  checkmk_enabled: 'false',
  checkmk_api_url: '',
  checkmk_api_user: 'automation',
  checkmk_api_secret: '',
  checkmk_sync_interval_ms: '60000',
  semaphore_enabled: 'false',
  semaphore_api_url: '',
  semaphore_api_token: '',
  semaphore_project_id: '',
  caddy_enabled: 'false',
  caddy_admin_url: 'http://127.0.0.1:2019',
};

const seedSetting = db.prepare('INSERT OR IGNORE INTO settings (key, value) VALUES (?, ?)');
for (const [key, value] of Object.entries(DEFAULT_SETTINGS)) seedSetting.run(key, value);

export function getSetting(key: string): string {
  const row = db.prepare('SELECT value FROM settings WHERE key = ?').get(key) as { value: string } | undefined;
  return row?.value ?? '';
}

export function setSetting(key: string, value: string): void {
  db.prepare("INSERT OR REPLACE INTO settings (key, value, updated_at) VALUES (?, ?, datetime('now'))").run(key, value);
}

export function getAllSettings(): Record<string, string> {
  const rows = db.prepare('SELECT key, value FROM settings').all() as { key: string; value: string }[];
  return Object.fromEntries(rows.map(r => [r.key, r.value]));
}

const insertLog = db.prepare(
  'INSERT INTO logs (id, timestamp, type, message, deviceId, userId) VALUES (?, ?, ?, ?, ?, ?)',
);

/**
 * Append a logbook entry. `deviceId`/`userId` default to NULL; `timestamp`
 * defaults to now (pass one to share a single timestamp across a batch).
 * Returns the generated log id.
 */
export function addLog(
  type: string,
  message: string,
  opts: { deviceId?: string | null; userId?: string | null; timestamp?: string } = {},
): string {
  const id = uid('log');
  insertLog.run(id, opts.timestamp ?? new Date().toISOString(), type, message, opts.deviceId ?? null, opts.userId ?? null);
  return id;
}

/** A reverse-proxy route as stored (booleans are SQLite 0/1 integers). */
export interface CaddyRoute {
  id: number;
  hostname: string;
  upstream: string;
  tls: number;
  compress: number;
  redirect: string;
  created_at: string;
}

/** Fields a caller supplies to create or update a route (JS booleans). */
export interface CaddyRouteInput {
  hostname: string;
  upstream: string;
  tls: boolean;
  compress: boolean;
  redirect?: string;
}

export function getCaddyRoutes(): CaddyRoute[] {
  return db.prepare('SELECT * FROM caddy ORDER BY id ASC').all() as CaddyRoute[];
}

export function getCaddyRouteById(id: number): CaddyRoute | undefined {
  return db.prepare('SELECT * FROM caddy WHERE id = ?').get(id) as CaddyRoute | undefined;
}

export function addCaddyRoute(route: CaddyRouteInput): CaddyRoute {
  const { lastInsertRowid } = db.prepare(
    'INSERT INTO caddy (hostname, upstream, tls, compress, redirect) VALUES (?, ?, ?, ?, ?)',
  ).run(route.hostname, route.upstream, route.tls ? 1 : 0, route.compress ? 1 : 0, route.redirect ?? '');
  return getCaddyRouteById(Number(lastInsertRowid))!;
}

export function updateCaddyRoute(id: number, route: CaddyRouteInput): CaddyRoute {
  db.prepare('UPDATE caddy SET hostname = ?, upstream = ?, tls = ?, compress = ?, redirect = ? WHERE id = ?')
    .run(route.hostname, route.upstream, route.tls ? 1 : 0, route.compress ? 1 : 0, route.redirect ?? '', id);
  return getCaddyRouteById(id)!;
}

export function deleteCaddyRoute(id: number): void {
  db.prepare('DELETE FROM caddy WHERE id = ?').run(id);
}

export default db;