<?php

namespace App\Models;

use App\Exceptions\ErrorException;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Schema;

class CustomForm extends SoftDeletesModel
{
    public static $cache_ttl = 60;

    /**
     * 获取请求中的表名
     */
    public static function tableName()
    {
        $tableName = request('table_name');
        if (empty($tableName)) {
            throw new ErrorException('表名不存在');
        }
        return $tableName;
    }

    /**
     * 关联关系
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function relation()
    {
        return $this->hasMany(CustomFormRelation::class, 'custom_form_id', 'id');
    }

    public function fields()
    {
        return $this->hasMany(CustomFormField::class, 'custom_form_id', 'id');
    }

    /**
     * 判断自定义表单是否存在表名
     */
    public function customForm($tableName = null)
    {
        if (empty($tableName)) $tableName = self::tableName();
        return Cache::remember('has_table_' . $tableName, CustomForm::$cache_ttl, function () use ($tableName) {
            return self::where('table_name', $tableName)->first();
        });
    }

    /**
     * 判断是否存在实体表
     */
    public function hasRealTable($tableName)
    {
        return Cache::remember('has_real_table_' . $tableName, CustomForm::$cache_ttl, function () use ($tableName) {
            return Schema::hasTable($tableName);
        });
    }

    /**
     * 创建表
     * @param $tableName
     * @return bool
     */
    public function createTable($customFormId)
    {
        $customForm = self::find($customFormId);
        if (!Schema::hasTable($customForm->table_name)) {
            Schema::create($customForm->table_name, function (Blueprint $table) {
                // 核心字段
                $table->increments('id')->comment('Id');
                $table->integer('admin_id')->nullable()->comment('管理员id');
                $table->integer('department_id')->nullable()->comment('部门id');
                $table->dateTime('created_at')->nullable()->comment('创建时间');
                $table->dateTime('updated_at')->nullable()->comment('更新时间');
                $table->dateTime('deleted_at')->nullable()->comment('删除时间');
            });
        }
        return true;
    }

    /**
     * 更新表
     */
    public function updateTable($customFormId)
    {
        try {
            $customForm = self::find($customFormId);
            $customFormField = new CustomFormField();
            // 如果实体表不存在则先创建
            if (!Schema::hasTable($customForm->table_name)) $this->createTable($customFormId);
            // 获取数据表里的字段配置信息
            $customFormFileds = $customFormField->where('custom_form_id', $customForm->id)->get();
            // 获取实体数据表里的非白名单字段
            $rowTableFields = $customFormField->rowTableFieldsByType($customForm->table_name, false);
            // 获取实体数据表里字段和注释
            $rowTableFieldsByComment = $customFormField->getRowTableFieldsByComment($customForm->table_name);
            Schema::table($customForm->table_name, function (Blueprint $table) use ($customFormFileds, $rowTableFields, $rowTableFieldsByComment) {
                // 其他字段。获取字段映射关系
                $editToMigration = EditToMigration::getAll();
                // 修正和新增字段
                foreach ($customFormFileds as $item) {
                    $filedType = $editToMigration[$item->edit_input];
                    if (isset($rowTableFields[$item->field])) {
                        // 字段存在，如果类型不一样或者备注不一样，则修改
                        if ($rowTableFields[$item->field] != $editToMigration[$item->edit_input] || $item->name != $rowTableFieldsByComment[$item->field]) {
                            $table->$filedType($item->field)->comment($item->name)->nullable()->change();
                        }
                    } else {
                        // 字段不存在则创建
                        $table->$filedType($item->field)->comment($item->name)->nullable();
                    }
                }
            });
            // 删除多余字段
            $this->delMoreFields($customForm->table_name, $customFormFileds->pluck('field')->toArray(), $rowTableFields);
            return '数据表更新成功';
        } catch (\Exception $exception) {
            return $exception->getMessage();
        }
    }


    /**
     * 删除实体数据表冗余字段
     */
    public function delMoreFields($tableName, $customFormFileds, $rowTableFields)
    {
        foreach ($rowTableFields as $key => $item) {
            if (!in_array($key, $customFormFileds)) {
                Schema::dropColumns($tableName, $key);
            }
        }
        return true;
    }

}