<?php

namespace App\Http\Controllers\Api;

use App\BaseApp\BaseController;
use App\Service\DatabaseService;
use Exception;
use Illuminate\Http\JsonResponse;

class DatabaseController extends BaseController
{
    public function __construct()
    {
        parent::__construct();
        $this->service = DatabaseService::getInstance();
    }

    /**
     * 获取表列表
     * @Method GET
     * @return JsonResponse
     */
    public function listTables(): JsonResponse
    {
        return jok($this->service->listTables());
    }

    /**
     * 获取表详细信息
     * @Method GET
     * @return JsonResponse
     * @throws Exception
     */
    public function getTableInfo(): JsonResponse
    {
        $tableName = request()->get('table_name');
        if (!$tableName) {
            return jerr('表名不能为空');
        }
        return jok($this->service->getTableInfo($tableName));
    }

    /**
     * 获取表数据（分页）
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function getTableData(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $page = request()->post('page', 1);
        $pageSize = request()->post('page_size', 20);
        $where = request()->post('where', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }

        return jok($this->service->getTableData($tableName, $page, $pageSize, $where));
    }

    /**
     * 更新表数据
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function updateTableData(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $data = request()->post('data', []);
        $where = request()->post('where', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (empty($data)) {
            return jerr('更新数据不能为空');
        }
        if (empty($where)) {
            return jerr('WHERE条件不能为空');
        }

        $result = $this->service->updateTableData($tableName, $data, $where);
        return jok($result, '更新成功');
    }

    /**
     * 删除表数据
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function deleteTableData(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $where = request()->post('where', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (empty($where)) {
            return jerr('WHERE条件不能为空');
        }

        $result = $this->service->deleteTableData($tableName, $where);
        return jok($result, '删除成功');
    }

    /**
     * 批量删除表数据
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function batchDeleteTableData(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $where = request()->post('where', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (empty($where)) {
            return jerr('WHERE条件不能为空');
        }

        $count = $this->service->batchDeleteTableData($tableName, $where);
        return jok(['count' => $count], "成功删除 {$count} 条记录");
    }

    /**
     * 插入表数据
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function insertTableData(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $data = request()->post('data', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (empty($data)) {
            return jerr('插入数据不能为空');
        }

        $id = $this->service->insertTableData($tableName, $data);
        return jok(['id' => $id], '插入成功');
    }

    /**
     * 更新表注释
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function updateTableComment(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $comment = request()->post('comment', '');

        if (!$tableName) {
            return jerr('表名不能为空');
        }

        $this->service->updateTableComment($tableName, $comment);
        return jok(true, '更新成功');
    }

    /**
     * 更新字段注释
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function updateColumnComment(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $columnName = request()->post('column_name');
        $comment = request()->post('comment', '');

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (!$columnName) {
            return jerr('字段名不能为空');
        }

        $this->service->updateColumnComment($tableName, $columnName, $comment);
        return jok(true, '更新成功');
    }

    /**
     * 添加索引
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function addIndex(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $indexName = request()->post('index_name');
        $columns = request()->post('columns', []);
        $unique = request()->post('unique', false);
        $type = request()->post('type', 'BTREE');

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (!$indexName) {
            return jerr('索引名不能为空');
        }
        if (empty($columns)) {
            return jerr('索引列不能为空');
        }

        $this->service->addIndex($tableName, $indexName, $columns, $unique, $type);
        return jok(true, '添加成功');
    }

    /**
     * 删除索引
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function dropIndex(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $indexName = request()->post('index_name');

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (!$indexName) {
            return jerr('索引名不能为空');
        }

        $this->service->dropIndex($tableName, $indexName);
        return jok(true, '删除成功');
    }

    /**
     * 修改表结构
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function updateTableStructure(): JsonResponse
    {
        $tableName = request()->post('table_name');
        $action = request()->post('action'); // add|modify|drop
        $columnInfo = request()->post('column_info', []);

        if (!$tableName) {
            return jerr('表名不能为空');
        }
        if (!in_array($action, ['add', 'modify', 'drop'])) {
            return jerr('操作类型不正确');
        }

        $this->service->updateTableStructure($tableName, $action, $columnInfo);
        return jok(true, '操作成功');
    }

    /**
     * 执行SQL查询（仅SELECT）
     * @Method POST
     * @return JsonResponse
     * @throws Exception
     */
    public function executeSqlQuery(): JsonResponse
    {
        $sql = request()->post('sql');
        
        if (empty($sql)) {
            return jerr('SQL语句不能为空');
        }
        
        $results = $this->service->executeSelectQuery($sql);
        return jok($results, '查询成功');
    }

    /**
     * 获取变更记录列表
     * @Method GET
     * @return JsonResponse
     * @throws Exception
     */
    public function getChangeLog(): JsonResponse
    {
        $page = request()->get('page', 1);
        $pageSize = request()->get('page_size', 20);
        $filters = [
            'table_name' => request()->get('table_name'),
            'operation_type' => request()->get('operation_type'),
            'start_time' => request()->get('start_time'),
            'end_time' => request()->get('end_time'),
        ];
        
        $result = $this->service->getChangeLog((int)$page, (int)$pageSize, array_filter($filters));
        return jok($result, '获取成功');
    }
}