/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import { TableSessionPool } from '../../src/client/TableSessionPool';

describe('TableSessionPool E2E Tests', () => {
  const IOTDB_HOST = process.env.IOTDB_HOST || 'localhost';
  const IOTDB_PORT = parseInt(process.env.IOTDB_PORT || '6667');
  const IOTDB_USER = process.env.IOTDB_USER || 'root';
  const IOTDB_PASSWORD = process.env.IOTDB_PASSWORD || 'root';

  let pool: TableSessionPool;
  let isConnected = false;

  beforeAll(async () => {
    pool = new TableSessionPool(IOTDB_HOST, IOTDB_PORT, {
      username: IOTDB_USER,
      password: IOTDB_PASSWORD,
      database: 'test1',
      maxPoolSize: 5,
      minPoolSize: 2
    });

    try {
      await pool.init();
      isConnected = true;
      // Cleanup from previous runs
      try {
        await pool.executeNonQueryStatement('DROP DATABASE test1');
        await pool.executeNonQueryStatement('DROP DATABASE test2');
      } catch (e) {
        // Ignore errors if databases don't exist
      }
    } catch (error) {
      console.warn('Could not connect to IoTDB. E2E tests will be skipped.');
      console.warn('Set IOTDB_HOST, IOTDB_PORT to run E2E tests against a real instance.');
    }
  }, 60000);

  afterAll(async () => {
    if (pool && isConnected) {
      // Cleanup
      try {
        await pool.executeNonQueryStatement('DROP DATABASE test1');
        await pool.executeNonQueryStatement('DROP DATABASE test2');
      } catch (e) {
        // Ignore cleanup errors
      }
      await pool.close();
    }
  }, 60000);

  test('Should create databases and tables (based on C# example)', async () => {
    if (!isConnected) {
      console.log('Skipping test - no IoTDB connection');
      return;
    }

    // Create databases
    await pool.executeNonQueryStatement('CREATE DATABASE test1');
    await pool.executeNonQueryStatement('CREATE DATABASE test2');

    // Use test2 database
    await pool.executeNonQueryStatement('USE test2');

    // Create table in test1 using full qualified name
    await pool.executeNonQueryStatement(
      'CREATE TABLE test1.table1(' +
      'region_id STRING TAG, ' +
      'plant_id STRING TAG, ' +
      'device_id STRING TAG, ' +
      'model STRING ATTRIBUTE, ' +
      'temperature FLOAT FIELD, ' +
      'humidity DOUBLE FIELD) ' +
      'WITH (TTL=3600000)'
    );

    // Create table in current database (test2)
    await pool.executeNonQueryStatement(
      'CREATE TABLE table2(' +
      'region_id STRING TAG, ' +
      'plant_id STRING TAG, ' +
      'color STRING ATTRIBUTE, ' +
      'temperature FLOAT FIELD, ' +
      'speed DOUBLE FIELD) ' +
      'WITH (TTL=6600000)'
    );

    // Show tables from current database (test2)
    const result1 = await pool.executeQueryStatement('SHOW TABLES');
    expect(result1).toBeDefined();
    expect(result1.rows.length).toBeGreaterThan(0);

    // Show tables from test1 database
    const result2 = await pool.executeQueryStatement('SHOW TABLES FROM test1');
    expect(result2).toBeDefined();
    expect(result2.rows.length).toBeGreaterThan(0);
  });

  test('Should insert and query table data (based on C# example)', async () => {
    if (!isConnected) {
      console.log('Skipping test - no IoTDB connection');
      return;
    }

    const tableName = 'testTable1';
    
    // Create table
    await pool.executeNonQueryStatement(
      `CREATE TABLE ${tableName}(` +
      'region_id STRING TAG, ' +
      'plant_id STRING TAG, ' +
      'device_id STRING TAG, ' +
      'model STRING ATTRIBUTE, ' +
      'temperature FLOAT FIELD, ' +
      'humidity DOUBLE FIELD)'
    );

    // Insert data using tablet - simplified to 50 records
    const tablet = {
      deviceId: tableName,
      measurements: ['region_id', 'plant_id', 'device_id', 'model', 'temperature', 'humidity'],
      dataTypes: [5, 5, 5, 5, 3, 4], // STRING, STRING, STRING, STRING, FLOAT, DOUBLE
      timestamps: [] as number[],
      values: [] as any[][],
    };

    for (let i = 0; i < 50; i++) {
      tablet.timestamps.push(i);
      tablet.values.push(['1', '5', '3', 'A', 1.23 + i, 111.1 + i]);
    }

    await pool.insertTablet(tablet);

    // Query the data
    const result = await pool.executeQueryStatement(
      `SELECT * FROM ${tableName} WHERE region_id = '1' AND plant_id IN ('3', '5') AND device_id = '3' LIMIT 10`
    );

    expect(result).toBeDefined();
    expect(result.rows.length).toBeGreaterThan(0);
  });

  test('Should use database context switching (based on C# example)', async () => {
    if (!isConnected) {
      console.log('Skipping test - no IoTDB connection');
      return;
    }

    // Show tables from test1
    const result1 = await pool.executeQueryStatement('SHOW TABLES FROM test1');
    expect(result1).toBeDefined();

    // Switch to test2
    await pool.executeNonQueryStatement('USE test2');

    // Show tables from current database (test2)
    const result2 = await pool.executeQueryStatement('SHOW TABLES');
    expect(result2).toBeDefined();
  });

  test('Should handle insert with null values (based on C# example)', async () => {
    if (!isConnected) {
      console.log('Skipping test - no IoTDB connection');
      return;
    }

    const tableName = 't1';

    // Create table
    await pool.executeNonQueryStatement(
      `CREATE TABLE ${tableName}(t1 STRING TAG, f1 INT32 FIELD)`
    );

    // Insert data with some null values
    const tablet = {
      deviceId: tableName,
      measurements: ['t1', 'f1'],
      dataTypes: [5, 1], // STRING, INT32
      timestamps: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
      values: [
        ['t1', 100],
        ['t1', 200],
        ['t1', 300],
        ['t1', 400],
        ['t1', 500],
        ['t1', null],
        ['t1', null],
        ['t1', null],
        ['t1', null],
        ['t1', null],
      ],
    };

    await pool.insertTablet(tablet);

    // Query null count
    const result = await pool.executeQueryStatement(
      `SELECT COUNT(*) FROM ${tableName} WHERE f1 IS NULL`
    );

    expect(result).toBeDefined();
    expect(result.rows.length).toBeGreaterThan(0);
    // Should have 5 null values
    const count = result.rows[0][0];
    expect(count).toBe(5);
  });

  test('Should report pool statistics', async () => {
    if (!isConnected) {
      console.log('Skipping test - no IoTDB connection');
      return;
    }

    const poolSize = pool.getPoolSize();
    const availableSize = pool.getAvailableSize();

    expect(poolSize).toBeGreaterThan(0);
    expect(availableSize).toBeGreaterThanOrEqual(0);
    expect(availableSize).toBeLessThanOrEqual(poolSize);
  });
});