const bcrypt = require('bcryptjs');
const database = require('../config/database');
const { getRedisConfig } = require('./redisConfig');

const DEFAULT_ADMIN_PASSWORD = 'admin123';
const SETUP_COMPLETED_KEY = 'setup_completed';
const SETUP_COMPLETED_AT_KEY = 'setup_completed_at';

function normalizeBoolean(value) {
  return value === true || value === 1 || value === '1' || value === 'true';
}

async function getSystemConfigMap(keys) {
  const rows = await database.local.query(
    `SELECT config_key, config_value
     FROM system_config
     WHERE config_key IN (${keys.map(() => '?').join(', ')})`,
    keys
  );

  return rows.reduce((acc, row) => {
    acc[row.config_key] = row.config_value;
    return acc;
  }, {});
}

async function upsertSystemConfig(key, value, type = 'string') {
  const existing = await database.local.query(
    'SELECT id FROM system_config WHERE config_key = ? LIMIT 1',
    [key]
  );

  if (existing.length > 0) {
    await database.local.query(
      'UPDATE system_config SET config_value = ?, config_type = ? WHERE config_key = ?',
      [value, type, key]
    );
    return;
  }

  await database.local.insert('system_config', {
    config_key: key,
    config_value: value,
    config_type: type,
  });
}

async function isBusinessDatabaseConfigured() {
  const rows = await database.local.query(
    `SELECT host, database_name, username, status
     FROM database_configs
     WHERE is_default = 1
     ORDER BY id ASC
     LIMIT 1`
  );

  const row = rows[0];
  return Boolean(
    row &&
    row.status === 'active' &&
    row.host &&
    row.database_name &&
    row.username
  );
}

async function isAuthConfigured() {
  const rows = await database.local.query(
    `SELECT auth_base_url, dingtalk_enabled, dingtalk_app_key, dingtalk_app_secret,
            google_enabled, google_client_id, google_client_secret
     FROM auth_configs
     ORDER BY id ASC
     LIMIT 1`
  );

  const row = rows[0];
  if (!row) {
    return false;
  }

  const dingtalkReady = normalizeBoolean(row.dingtalk_enabled) && Boolean(row.dingtalk_app_key && row.dingtalk_app_secret);
  const googleReady = normalizeBoolean(row.google_enabled) && Boolean(row.google_client_id && row.google_client_secret);

  return Boolean((row.auth_base_url || '').trim() || dingtalkReady || googleReady);
}

async function isS3Configured() {
  const rows = await database.local.query(
    `SELECT bucket, access_key_id, secret_access_key
     FROM s3_configs
     WHERE is_default = 1
     ORDER BY id ASC
     LIMIT 1`
  );

  const row = rows[0];
  return Boolean(row && row.bucket && row.access_key_id && row.secret_access_key);
}

async function getCurrentAdminUser(userId) {
  const rows = await database.local.query(
    `SELECT id, username, name, email, role, status, password_hash
     FROM users
     WHERE id = ?
     LIMIT 1`,
    [userId]
  );

  return rows[0] || null;
}

async function isUsingDefaultPassword(user) {
  if (!user || !user.password_hash) {
    return false;
  }

  return bcrypt.compare(DEFAULT_ADMIN_PASSWORD, user.password_hash);
}

async function ensureSetupConfigDefaults() {
  const configMap = await getSystemConfigMap([SETUP_COMPLETED_KEY, SETUP_COMPLETED_AT_KEY]);

  if (configMap[SETUP_COMPLETED_KEY] === undefined) {
    const inferredCompleted = await isBusinessDatabaseConfigured();
    await upsertSystemConfig(SETUP_COMPLETED_KEY, inferredCompleted ? 'true' : 'false', 'boolean');
  }

  if (configMap[SETUP_COMPLETED_AT_KEY] === undefined) {
    await upsertSystemConfig(SETUP_COMPLETED_AT_KEY, '', 'string');
  }
}

async function getSetupStatus(userId) {
  await ensureSetupConfigDefaults();

  const [configMap, currentUser, businessDatabaseConfigured, authConfigured, s3Configured] = await Promise.all([
    getSystemConfigMap([SETUP_COMPLETED_KEY, SETUP_COMPLETED_AT_KEY]),
    getCurrentAdminUser(userId),
    isBusinessDatabaseConfigured(),
    isAuthConfigured(),
    isS3Configured(),
  ]);
  const redisConfigured = (await getRedisConfig()).enabled;

  const currentUserUsesDefaultPassword = await isUsingDefaultPassword(currentUser);
  const completed = normalizeBoolean(configMap[SETUP_COMPLETED_KEY]);

  return {
    completed,
    shouldShowWizard: !completed,
    completedAt: configMap[SETUP_COMPLETED_AT_KEY] || '',
    currentUser: currentUser
      ? {
          id: currentUser.id,
          username: currentUser.username,
          name: currentUser.name,
          email: currentUser.email,
          role: currentUser.role,
          status: currentUser.status,
        }
      : null,
    currentUserUsesDefaultPassword,
    steps: {
      changeAdminPassword: !currentUserUsesDefaultPassword,
      businessDatabase: businessDatabaseConfigured,
      redisCache: redisConfigured,
      authConfig: authConfigured,
      objectStorage: s3Configured,
    },
  };
}

async function markSetupCompleted(userId) {
  const status = await getSetupStatus(userId);

  if (!status.steps.businessDatabase) {
    throw new Error('请先完成业务数据库配置');
  }

  if (status.currentUserUsesDefaultPassword) {
    throw new Error('请先修改默认管理员密码');
  }

  await upsertSystemConfig(SETUP_COMPLETED_KEY, 'true', 'boolean');
  await upsertSystemConfig(SETUP_COMPLETED_AT_KEY, new Date().toISOString(), 'string');

  return getSetupStatus(userId);
}

module.exports = {
  DEFAULT_ADMIN_PASSWORD,
  ensureSetupConfigDefaults,
  getSetupStatus,
  markSetupCompleted,
};