import Database from "better-sqlite3";
import { mkdirSync } from "node:fs";
import { dirname } from "node:path";

const path = process.env.HUB_BUILD === "1" ? ":memory:" : (process.env.DATABASE_PATH || "./data/hub.db");
if (path !== ":memory:") mkdirSync(dirname(path), { recursive: true });
export const db = new Database(path);
db.pragma("journal_mode = WAL");
db.pragma("foreign_keys = ON");
db.pragma("busy_timeout = 5000");

db.exec(`
CREATE TABLE IF NOT EXISTS users (
  id INTEGER PRIMARY KEY, username TEXT UNIQUE NOT NULL, password_hash TEXT NOT NULL,
  role TEXT NOT NULL DEFAULT 'user', created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, disabled INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS sources (
  id INTEGER PRIMARY KEY, user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  name TEXT NOT NULL, base_url TEXT NOT NULL, token_encrypted TEXT NOT NULL, remote_user TEXT,
  webhook_supported INTEGER NOT NULL DEFAULT 0, sync_status TEXT NOT NULL DEFAULT 'pending', last_synced_at TEXT, last_error TEXT,
  is_enabled INTEGER NOT NULL DEFAULT 1, disabled_at TEXT,
  created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, UNIQUE(user_id, base_url)
);
CREATE TABLE IF NOT EXISTS posts (
  id INTEGER PRIMARY KEY, source_id INTEGER REFERENCES sources(id) ON DELETE SET NULL,
  author_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE, remote_memo_name TEXT, content TEXT NOT NULL,
  visibility TEXT NOT NULL DEFAULT 'PUBLIC', tags_json TEXT NOT NULL DEFAULT '[]', attachments_json TEXT NOT NULL DEFAULT '[]',
  origin TEXT NOT NULL DEFAULT 'memos', remote_created_at TEXT, remote_updated_at TEXT, sync_status TEXT NOT NULL DEFAULT 'synced',
  hidden INTEGER NOT NULL DEFAULT 0, created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, updated_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
  UNIQUE(source_id, remote_memo_name)
);
CREATE TABLE IF NOT EXISTS comments (
  id INTEGER PRIMARY KEY, post_id INTEGER NOT NULL REFERENCES posts(id) ON DELETE CASCADE,
  author_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE, content TEXT NOT NULL,
  created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, hidden INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS reactions (
  post_id INTEGER NOT NULL REFERENCES posts(id) ON DELETE CASCADE, user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  emoji TEXT NOT NULL, created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY(post_id, user_id, emoji)
);
CREATE TABLE IF NOT EXISTS reports (
  id INTEGER PRIMARY KEY, post_id INTEGER NOT NULL REFERENCES posts(id) ON DELETE CASCADE, reporter_id INTEGER REFERENCES users(id) ON DELETE SET NULL,
  reason TEXT NOT NULL, created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP, resolved INTEGER NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS sync_jobs (
  id INTEGER PRIMARY KEY, source_id INTEGER NOT NULL REFERENCES sources(id) ON DELETE CASCADE,
  kind TEXT NOT NULL, payload_json TEXT, status TEXT NOT NULL DEFAULT 'queued', attempts INTEGER NOT NULL DEFAULT 0,
  trigger TEXT NOT NULL DEFAULT 'manual', last_error TEXT, created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
  started_at TEXT, finished_at TEXT, run_after TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);
CREATE TABLE IF NOT EXISTS source_members (
  source_id INTEGER NOT NULL REFERENCES sources(id) ON DELETE CASCADE,
  user_id INTEGER NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  role TEXT NOT NULL DEFAULT 'member', created_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY(source_id, user_id)
);
CREATE INDEX IF NOT EXISTS posts_public_idx ON posts(visibility, hidden, created_at DESC);
CREATE INDEX IF NOT EXISTS sync_jobs_idx ON sync_jobs(status, run_after);
CREATE UNIQUE INDEX IF NOT EXISTS source_remote_identity_unique ON sources(base_url, remote_user) WHERE remote_user IS NOT NULL;
CREATE TABLE IF NOT EXISTS schema_migrations (
  version INTEGER PRIMARY KEY, applied_at TEXT NOT NULL DEFAULT CURRENT_TIMESTAMP
);
`);

db.exec("INSERT OR IGNORE INTO source_members(source_id,user_id,role) SELECT id,user_id,'owner' FROM sources");

function applyColumnMigration(version: number, table: string, column: string, sql: string) {
  const columns = db.prepare(`PRAGMA table_info(${table})`).all() as { name: string }[];
  if (!columns.some((item) => item.name === column)) db.exec(sql);
  db.prepare("INSERT OR IGNORE INTO schema_migrations(version) VALUES(?)").run(version);
}

applyColumnMigration(1, "sources", "webhook_secret_hash", "ALTER TABLE sources ADD COLUMN webhook_secret_hash TEXT");
applyColumnMigration(2, "sources", "last_webhook_at", "ALTER TABLE sources ADD COLUMN last_webhook_at TEXT");
applyColumnMigration(3, "sources", "is_enabled", "ALTER TABLE sources ADD COLUMN is_enabled INTEGER NOT NULL DEFAULT 1");
applyColumnMigration(4, "sources", "disabled_at", "ALTER TABLE sources ADD COLUMN disabled_at TEXT");
applyColumnMigration(5, "sync_jobs", "trigger", "ALTER TABLE sync_jobs ADD COLUMN trigger TEXT NOT NULL DEFAULT 'manual'");
applyColumnMigration(6, "sync_jobs", "started_at", "ALTER TABLE sync_jobs ADD COLUMN started_at TEXT");
applyColumnMigration(7, "sync_jobs", "finished_at", "ALTER TABLE sync_jobs ADD COLUMN finished_at TEXT");

const admin = process.env.ADMIN_USERNAME;
const adminPassword = process.env.ADMIN_PASSWORD;
if (admin && adminPassword) {
  // Keep bootstrap safe when Next preloads multiple route modules concurrently.
  const bcrypt = require("bcryptjs");
  db.prepare("INSERT OR IGNORE INTO users(username, password_hash, role) VALUES (?, ?, 'admin')").run(admin, bcrypt.hashSync(adminPassword, 12));
}

const seedUrl = process.env.SEED_MEMOS_URL?.replace(/\/$/, "");
const seedToken = process.env.SEED_MEMOS_TOKEN;
if (admin && seedUrl && seedToken) {
  const user = db.prepare("SELECT id FROM users WHERE username=?").get(admin) as { id: number } | undefined;
  const source = db.prepare("SELECT id FROM sources WHERE user_id=? AND base_url=?").get(user?.id, seedUrl) as { id: number } | undefined;
  if (user && !source) {
    const { encrypt } = require("./crypto") as typeof import("./crypto");
    db.prepare("INSERT OR IGNORE INTO sources(user_id,name,base_url,token_encrypted,sync_status) VALUES(?,?,?,?, 'queued')").run(user.id, process.env.SEED_MEMOS_NAME || "Initial Memos", seedUrl, encrypt(seedToken));
    const inserted = db.prepare("SELECT id FROM sources WHERE user_id=? AND base_url=?").get(user.id, seedUrl) as { id: number };
    db.prepare("INSERT INTO sync_jobs(source_id,kind) SELECT ?, 'pull' WHERE NOT EXISTS (SELECT 1 FROM sync_jobs WHERE source_id=? AND kind='pull' AND status IN ('queued','running'))").run(inserted.id, inserted.id);
  }
}