<?php
// +----------------------------------------------------------------------
// | Niucloud-admin 企业快速开发的多应用管理平台
// +----------------------------------------------------------------------
// | 官方网址：https://www.niucloud.com
// +----------------------------------------------------------------------
// | niucloud团队 版权所有 开源版本可自由商用
// +----------------------------------------------------------------------
// | Author: Niucloud Team
// +----------------------------------------------------------------------

namespace app\service\admin\document;

use app\model\document\DocumentDataSourceConfig;
use app\model\contract\Contract;
use core\base\BaseAdminService;
use think\facade\Db;

/**
 * 文档数据源配置服务类
 * Class DocumentDataSourceService
 * @package app\service\admin\document
 */
class DocumentDataSourceService extends BaseAdminService
{
    public function __construct()
    {
        parent::__construct();
        $this->model = new DocumentDataSourceConfig();
    }

    /**
     * 获取数据源配置分页列表
     * @param array $where
     * @return array
     */
    public function getPage(array $where = []): array
    {
        $field = 'id, contract_id, table_name, table_alias, field_name, field_alias, field_type, is_active, sort_order, created_at';
        $order = 'sort_order asc, created_at desc';

        $search_model = $this->model
            ->withSearch(['contract_id', 'table_name', 'field_name'], $where)
            ->field($field)
            ->order($order);

        $list = $this->pageQuery($search_model, $where);

        // 关联合同信息
        if (!empty($list['data'])) {
            $contract_ids = array_unique(array_column($list['data'], 'contract_id'));
            $contracts = (new Contract())->whereIn('id', $contract_ids)->column('name', 'id');

            foreach ($list['data'] as &$item) {
                $item['contract_name'] = $contracts[$item['contract_id']] ?? '';
                // 兼容placeholder字段
                $item['placeholder'] = '{{' . $item['field_alias'] . '}}';
            }
        }

        return $list;
    }

    /**
     * 获取数据源配置信息
     * @param int $id
     * @return array
     */
    public function getInfo(int $id): array
    {
        $field = 'id, contract_id, table_name, table_alias, field_name, field_alias, field_type, is_active, sort_order, created_at';

        $info = $this->model->field($field)->where([['id', '=', $id]])->findOrEmpty()->toArray();
        if (empty($info)) {
            throw new \Exception('DATA_NOT_EXIST');
        }

        // 获取合同信息
        if (!empty($info['contract_id'])) {
            $contract = (new Contract())->where('id', $info['contract_id'])->field('id, name')->findOrEmpty();
            $info['contract_name'] = $contract['name'] ?? '';
        }

        // 兼容placeholder字段
        $info['placeholder'] = '{{' . $info['field_alias'] . '}}';

        return $info;
    }

    /**
     * 添加数据源配置
     * @param array $data
     * @return mixed
     */
    public function add(array $data)
    {
        // 检查占位符是否已存在
        $exists = $this->model->where([
            ['contract_id', '=', $data['contract_id']],
            ['placeholder', '=', $data['placeholder']]
        ])->findOrEmpty();
        
        if (!$exists->isEmpty()) {
            throw new \Exception('PLACEHOLDER_EXISTS');
        }
        
        $data['created_at'] = time();
        $res = $this->model->save($data);
        if (!$res) {
            throw new \Exception('ADD_FAIL');
        }
        
        return $this->model->id;
    }

    /**
     * 编辑数据源配置
     * @param int $id
     * @param array $data
     * @return bool
     */
    public function edit(int $id, array $data): bool
    {
        $info = $this->model->findOrEmpty($id);
        if ($info->isEmpty()) {
            throw new \Exception('DATA_NOT_EXIST');
        }
        
        // 检查占位符是否已存在（排除当前记录）
        $exists = $this->model->where([
            ['contract_id', '=', $data['contract_id']],
            ['placeholder', '=', $data['placeholder']],
            ['id', '<>', $id]
        ])->findOrEmpty();
        
        if (!$exists->isEmpty()) {
            throw new \Exception('PLACEHOLDER_EXISTS');
        }
        
        $res = $info->save($data);
        if (!$res) {
            throw new \Exception('EDIT_FAIL');
        }
        
        return true;
    }

    /**
     * 删除数据源配置
     * @param int $id
     * @return bool
     */
    public function del(int $id): bool
    {
        $info = $this->model->findOrEmpty($id);
        if ($info->isEmpty()) {
            throw new \Exception('DATA_NOT_EXIST');
        }
        
        $res = $info->delete();
        if (!$res) {
            throw new \Exception('DELETE_FAIL');
        }
        
        return true;
    }

    /**
     * 批量配置数据源
     * @param int $contractId
     * @param array $configs
     * @return bool
     */
    public function batchConfig(int $contractId, array $configs): bool
    {
        if (empty($contractId) || empty($configs)) {
            throw new \Exception('INVALID_PARAMS');
        }
        
        // 开启事务
        Db::startTrans();
        try {
            // 删除原有配置
            $this->model->where('contract_id', $contractId)->delete();
            
            // 批量插入新配置
            $insertData = [];
            foreach ($configs as $config) {
                $insertData[] = [
                    'contract_id' => $contractId,
                    'placeholder' => $config['placeholder'] ?? '',
                    'table_name' => $config['table_name'] ?? '',
                    'field_name' => $config['field_name'] ?? '',
                    'field_type' => $config['field_type'] ?? 'string',
                    'is_required' => $config['is_required'] ?? 0,
                    'default_value' => $config['default_value'] ?? '',
                    'created_at' => time()
                ];
            }
            
            if (!empty($insertData)) {
                $this->model->insertAll($insertData);
            }
            
            Db::commit();
            return true;
        } catch (\Exception $e) {
            Db::rollback();
            throw $e;
        }
    }

    /**
     * 获取可用数据表列表
     * @return array
     */
    public function getAvailableTables(): array
    {
        // 定义可用的数据表及其描述
        $tables = [
            'school_personnel' => '员工基础信息表',
            'school_personnel_info' => '员工详细信息表',
            'school_member' => '会员信息表',
            'school_contract_sign' => '合同签署表',
            'school_course' => '课程信息表',
            'school_order' => '订单信息表'
        ];
        
        $result = [];
        foreach ($tables as $table => $description) {
            $result[] = [
                'table_name' => $table,
                'description' => $description
            ];
        }
        
        return $result;
    }

    /**
     * 获取数据表字段列表
     * @param string $tableName
     * @return array
     */
    public function getTableFields(string $tableName): array
    {
        try {
            $fields = Db::query("SHOW COLUMNS FROM {$tableName}");
            
            $result = [];
            foreach ($fields as $field) {
                $result[] = [
                    'field_name' => $field['Field'],
                    'field_type' => $this->parseFieldType($field['Type']),
                    'is_nullable' => $field['Null'] === 'YES',
                    'default_value' => $field['Default'],
                    'comment' => $field['Comment'] ?? ''
                ];
            }
            
            return $result;
        } catch (\Exception $e) {
            throw new \Exception('TABLE_NOT_EXISTS');
        }
    }

    /**
     * 解析字段类型
     * @param string $type
     * @return string
     */
    private function parseFieldType(string $type): string
    {
        if (strpos($type, 'int') !== false) {
            return 'integer';
        } elseif (strpos($type, 'decimal') !== false || strpos($type, 'float') !== false || strpos($type, 'double') !== false) {
            return 'decimal';
        } elseif (strpos($type, 'date') !== false || strpos($type, 'time') !== false) {
            return 'datetime';
        } elseif (strpos($type, 'text') !== false) {
            return 'text';
        } else {
            return 'string';
        }
    }

    /**
     * 预览数据源配置效果
     * @param int $contractId
     * @param array $sampleData
     * @return array
     */
    public function preview(int $contractId, array $sampleData = []): array
    {
        // 获取合同的数据源配置
        $configs = $this->model->where('contract_id', $contractId)->select()->toArray();

        $result = [];
        foreach ($configs as $config) {
            $placeholder = $config['field_alias'] ?? $config['placeholder'] ?? '';
            $value = $sampleData[$placeholder] ?? $config['default_value'] ?? '';

            $result[] = [
                'placeholder' => '{{' . $placeholder . '}}',
                'table_name' => $config['table_name'],
                'field_name' => $config['field_name'],
                'field_type' => $config['field_type'],
                'is_required' => $config['is_active'] ?? 1,
                'preview_value' => $value
            ];
        }

        return $result;
    }
}