import { Response } from 'express';
import { AuthRequest } from '../middleware/auth';
import { mainPool } from '../config/database';
import { databasePoolManager } from '../services/DatabasePoolManager';
import { generateSchemaForDatabase } from './schemaController';
import { Environment } from '../types';

export const getDatabases = async (req: AuthRequest, res: Response) => {
  try {
    const result = await mainPool.query(
      `SELECT id, name, type, host, port, database_name, username, ssl, is_active,
              aql_base_url, aql_auth_type, aql_auth_value, aql_headers,
              has_test_env, test_host, test_port, test_database_name, test_username, test_ssl,
              test_aql_base_url, test_aql_headers,
              created_at, updated_at
       FROM databases ORDER BY name`
    );

    res.json(result.rows);
  } catch (error) {
    console.error('Get databases error:', error);
    res.status(500).json({ error: 'Ошибка получения списка баз данных' });
  }
};

export const getDatabase = async (req: AuthRequest, res: Response) => {
  try {
    const { id } = req.params;

    const result = await mainPool.query(
      `SELECT id, name, type, host, port, database_name, username, ssl, is_active,
              aql_base_url, aql_auth_type, aql_auth_value, aql_headers,
              has_test_env, test_host, test_port, test_database_name, test_username, test_ssl,
              test_aql_base_url, test_aql_headers,
              created_at, updated_at
       FROM databases WHERE id = $1`,
      [id]
    );

    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'База данных не найдена' });
    }

    res.json(result.rows[0]);
  } catch (error) {
    console.error('Get database error:', error);
    res.status(500).json({ error: 'Ошибка получения базы данных' });
  }
};

export const createDatabase = async (req: AuthRequest, res: Response) => {
  try {
    const {
      name, type, host, port, database_name, username, password, ssl,
      aql_base_url, aql_auth_type, aql_auth_value, aql_headers,
      has_test_env, test_host, test_port, test_database_name, test_username, test_password, test_ssl,
      test_aql_base_url, test_aql_auth_value, test_aql_headers
    } = req.body;

    const dbType = type || 'postgresql';

    if (dbType !== 'aql') {
      if (!name || !host || !port || !database_name || !username || !password) {
        return res.status(400).json({ error: 'Не заполнены обязательные поля' });
      }
    } else {
      if (!name || !aql_base_url) {
        return res.status(400).json({ error: 'Не заполнены обязательные поля для AQL базы' });
      }
    }

    const result = await mainPool.query(
      `INSERT INTO databases (
        name, type, host, port, database_name, username, password, ssl, is_active,
        aql_base_url, aql_auth_type, aql_auth_value, aql_headers,
        has_test_env, test_host, test_port, test_database_name, test_username, test_password, test_ssl,
        test_aql_base_url, test_aql_auth_value, test_aql_headers
      )
       VALUES ($1, $2, $3, $4, $5, $6, $7, $8, true, $9, $10, $11, $12, $13, $14, $15, $16, $17, $18, $19, $20, $21, $22)
       RETURNING *`,
      [
        name,
        dbType,
        host || '',
        port || 0,
        database_name || '',
        username || '',
        password || '',
        ssl || false,
        aql_base_url || null,
        aql_auth_type || null,
        aql_auth_value || null,
        aql_headers ? JSON.stringify(aql_headers) : null,
        has_test_env || false,
        test_host || null,
        test_port || null,
        test_database_name || null,
        test_username || null,
        test_password || null,
        test_ssl || null,
        test_aql_base_url || null,
        test_aql_auth_value || null,
        test_aql_headers ? JSON.stringify(test_aql_headers) : null,
      ]
    );

    const newDb = result.rows[0];

    if (dbType !== 'aql') {
      await databasePoolManager.reloadPool(newDb.id);

      if (dbType === 'postgresql') {
        generateSchemaForDatabase(newDb.id).catch(err => {
          console.error('Background schema generation failed:', err.message);
        });
      }
    }

    delete newDb.password;
    delete newDb.aql_auth_value;
    delete newDb.test_password;
    delete newDb.test_aql_auth_value;

    res.status(201).json(newDb);
  } catch (error: any) {
    console.error('Create database error:', error);
    if (error.code === '23505') {
      return res.status(400).json({ error: 'База данных с таким именем уже существует' });
    }
    res.status(500).json({ error: 'Ошибка создания базы данных' });
  }
};

export const updateDatabase = async (req: AuthRequest, res: Response) => {
  try {
    const { id } = req.params;
    const {
      name, type, host, port, database_name, username, password, ssl, is_active,
      aql_base_url, aql_auth_type, aql_auth_value, aql_headers,
      has_test_env, test_host, test_port, test_database_name, test_username, test_password, test_ssl,
      test_aql_base_url, test_aql_auth_value, test_aql_headers
    } = req.body;

    // Build SET clauses and params dynamically to handle optional password fields
    const setClauses: string[] = [];
    const params: any[] = [];
    let idx = 1;

    const addField = (clause: string, value: any) => {
      setClauses.push(`${clause} = $${idx}`);
      params.push(value);
      idx++;
    };

    const addCoalesce = (field: string, value: any) => {
      setClauses.push(`${field} = COALESCE($${idx}, ${field})`);
      params.push(value);
      idx++;
    };

    addCoalesce('name', name);
    addCoalesce('type', type);
    addCoalesce('host', host);
    addCoalesce('port', port);
    addCoalesce('database_name', database_name);
    addCoalesce('username', username);
    if (password) { addField('password', password); }
    addCoalesce('ssl', ssl);
    addCoalesce('is_active', is_active);
    addCoalesce('aql_base_url', aql_base_url);
    addCoalesce('aql_auth_type', aql_auth_type);
    if (aql_auth_value) { addField('aql_auth_value', aql_auth_value); }
    addCoalesce('aql_headers', aql_headers ? JSON.stringify(aql_headers) : null);
    addCoalesce('has_test_env', has_test_env);
    // Test fields: use direct SET (nullable — user may want to clear them)
    addField('test_host', test_host || null);
    addField('test_port', test_port || null);
    addField('test_database_name', test_database_name || null);
    addField('test_username', test_username || null);
    if (test_password) { addField('test_password', test_password); }
    addField('test_ssl', test_ssl !== undefined ? test_ssl : null);
    addField('test_aql_base_url', test_aql_base_url || null);
    if (test_aql_auth_value) { addField('test_aql_auth_value', test_aql_auth_value); }
    addField('test_aql_headers', test_aql_headers ? JSON.stringify(test_aql_headers) : null);

    setClauses.push('updated_at = CURRENT_TIMESTAMP');

    params.push(id);
    const whereIdx = idx;

    const query = `
      UPDATE databases
      SET ${setClauses.join(', ')}
      WHERE id = $${whereIdx}
      RETURNING id, name, type, host, port, database_name, username, ssl, is_active,
                aql_base_url, aql_auth_type, aql_headers,
                has_test_env, test_host, test_port, test_database_name, test_username, test_ssl,
                test_aql_base_url, test_aql_headers,
                created_at, updated_at`;

    const result = await mainPool.query(query, params);

    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'База данных не найдена' });
    }

    if (result.rows[0].type !== 'aql') {
      await databasePoolManager.reloadPool(id);
    }

    res.json(result.rows[0]);
  } catch (error: any) {
    console.error('Update database error:', error);
    if (error.code === '23505') {
      return res.status(400).json({ error: 'База данных с таким именем уже существует' });
    }
    res.status(500).json({ error: 'Ошибка обновления базы данных' });
  }
};

export const deleteDatabase = async (req: AuthRequest, res: Response) => {
  try {
    const { id } = req.params;

    const endpointCheck = await mainPool.query(
      'SELECT COUNT(*) FROM endpoints WHERE database_id = $1',
      [id]
    );

    if (parseInt(endpointCheck.rows[0].count) > 0) {
      return res.status(400).json({
        error: 'Невозможно удалить базу данных, используемую в эндпоинтах'
      });
    }

    const result = await mainPool.query(
      'DELETE FROM databases WHERE id = $1 RETURNING id',
      [id]
    );

    if (result.rows.length === 0) {
      return res.status(404).json({ error: 'База данных не найдена' });
    }

    databasePoolManager.removePool(id);

    res.json({ message: 'База данных удалена успешно' });
  } catch (error) {
    console.error('Delete database error:', error);
    res.status(500).json({ error: 'Ошибка удаления базы данных' });
  }
};

export const testDatabaseConnection = async (req: AuthRequest, res: Response) => {
  try {
    const { id } = req.params;
    const env = (req.query.env as string)?.toLowerCase() === 'test' ? 'test' : 'prod' as Environment;

    const dbResult = await mainPool.query('SELECT type FROM databases WHERE id = $1', [id]);

    if (dbResult.rows.length === 0) {
      return res.status(404).json({ success: false, error: 'База данных не найдена' });
    }

    const dbType = dbResult.rows[0].type;

    if (dbType === 'aql') {
      const { aqlExecutor } = require('../services/AqlExecutor');
      const result = await aqlExecutor.testConnection(id, env);

      res.json({
        success: result.success,
        message: result.success ? 'Подключение успешно' : result.error || 'Ошибка подключения',
      });
    } else {
      const isConnected = await databasePoolManager.testConnection(id, env);

      res.json({
        success: isConnected,
        message: isConnected ? 'Подключение успешно' : 'Ошибка подключения',
      });
    }
  } catch (error) {
    console.error('Test connection error:', error);
    res.status(500).json({ error: 'Ошибка тестирования подключения' });
  }
};