// Package api2sql ...
//
// Description : api2sql ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2024-08-21 20:45
package api2sql

import (
	"context"
	"errors"
	"fmt"
	"git.zhangdeman.cn/zhangdeman/consts"
	"git.zhangdeman.cn/zhangdeman/database"
	"git.zhangdeman.cn/zhangdeman/database/abstract"
	"git.zhangdeman.cn/zhangdeman/database/define"
	"git.zhangdeman.cn/zhangdeman/wrapper"
	"gorm.io/gorm"
)

var (
	Exec = &execute{}
)

type execute struct {
	databaseClientManager abstract.IWrapperClient // 全部数据库管理的实例
	baseDao               database.BaseDao        // 基础dao
}

// SetDatabaseClientManager 设置数据库连接管理实例
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 21:06 2024/8/21
func (e *execute) SetDatabaseClientManager(databaseClientManager abstract.IWrapperClient) {
	e.databaseClientManager = databaseClientManager
}

// Run 执行
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:48 2024/8/21
func (e *execute) Run(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	if err := e.formatAndValidateInputParam(inputParam); nil != err {
		return nil, err
	}
	if len(inputParam.InputSql) > 0 {
		// 基于表达式执行
		return e.Express(ctx, inputParam)
	}
	switch inputParam.SqlType {
	case consts.SqlTypeCount:
		return e.Count(ctx, inputParam)
	case consts.SqlTypeDetail:
		return e.Detail(ctx, inputParam)
	case consts.SqlTypeList:
		return e.List(ctx, inputParam)
	case consts.SqlTypeInsert:
		return e.Insert(ctx, inputParam)
	case consts.SqlTypeUpdate:
		return e.Update(ctx, inputParam)
	case consts.SqlTypeDelete:
		return e.Delete(ctx, inputParam)
	default:
		return nil, errors.New(inputParam.SqlType + " : sql type is not support")

	}
}

// List 列表
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:52 2024/8/21
func (e *execute) List(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	var (
		err        error
		tx         *gorm.DB
		optionList []database.SetOption
	)
	if tx, err = e.getTx(ctx, inputParam); nil != err {
		return nil, err
	}
	if optionList, err = e.getOptionList(ctx, inputParam); nil != err {
		return nil, err
	}
	// 动态生成结果解析结构体
	st := wrapper.NewDynamic()
	for _, columnConfig := range inputParam.ColumnList {
		tag := fmt.Sprintf(`gorm:%v json:%v`, columnConfig.Column, columnConfig.Alias)
		switch columnConfig.Type {
		case "int", "int8", "int16", "int32", "int64":
			st.AddInt(columnConfig.Column, tag, "")
		case "uint", "uint8", "uint16", "uint32", "uint64":
			st.AddUint(columnConfig.Column, tag, "")
		case "bool":
			st.AddBool(columnConfig.Column, tag, "")
		case "float":
			st.AddBool(columnConfig.Column, tag, "")
		case "string":
			st.AddString(columnConfig.Column, tag, "")
		case "map":
			st.AddMap(columnConfig.Column, tag, "")
		case "slice":
			st.AddSlice(columnConfig.Column, tag, "")
		}
	}
	val := st.ToStructDefaultSliceValue()
	if err = e.baseDao.List(tx, &val, optionList...); nil != err {
		return nil, err
	}
	return val, nil
}

// Detail 详情
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:52 2024/8/21
func (e *execute) Detail(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	return nil, nil
}

// Insert 插入
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:52 2024/8/21
func (e *execute) Insert(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	return nil, nil
}

// Update 更新
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:52 2024/8/21
func (e *execute) Update(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	return nil, nil
}

// Count 数量
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:52 2024/8/21
func (e *execute) Count(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	return nil, nil
}

// Delete 删除
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:51 2024/8/21
func (e *execute) Delete(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	return nil, nil
}

// Express 基于表达式执行
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 20:51 2024/8/21
func (e *execute) Express(ctx context.Context, inputParam *define.Api2SqlParam) (any, error) {
	if nil == e.databaseClientManager {
		return nil, errors.New("database client is nil, please use `SetDatabaseClientManager` set instance")
	}
	// 格式化 inputParam
	return nil, nil
}

// formatAndValidateInputParam 格式化并校验输入参数
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 10:38 2024/8/22
func (e *execute) formatAndValidateInputParam(inputParam *define.Api2SqlParam) error {
	if nil == inputParam {
		return errors.New("inputParam is nil")
	}
	if len(inputParam.DatabaseFlag) == 0 {
		return errors.New("databaseFlag is empty")
	}
	if len(inputParam.Table) == 0 {
		return errors.New("table is empty")
	}
	if len(inputParam.SqlType) == 0 {
		return errors.New("sqlType is empty")
	}
	databaseClient, err := e.databaseClientManager.GetDBClient(inputParam.DatabaseFlag)
	if nil != err {
		return errors.New(inputParam.DatabaseFlag + " : database client get fail -> " + err.Error())
	}
	// 尝试获取表结构, api 转 sql 要求必须开启表结构缓存, 否则无法确定相关数据如何解析
	if inputParam.TableColumnConfig, err = databaseClient.GetTableFieldList(inputParam.Table); nil != err {
		return errors.New(inputParam.DatabaseFlag + " : get table field list fail -> " + err.Error())
	}
	if len(inputParam.TableColumnConfig) == 0 {
		return errors.New(inputParam.DatabaseFlag + " : table field list is empty, please enable `CacheDataTableStructureConfig` or `SetTableColumnConfig`")
	}
	// 操作字段列表为空
	if err = e.validateColumn(inputParam); nil != err {
		return err
	}
	// 验证 force no limit
	if inputParam.ForceNoLimit {
		inputParam.Limit = 0
		inputParam.WithCount = false
	}
	return nil
}

// validateColumn 验证表字段相关
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:48 2024/8/22
func (e *execute) validateColumn(inputParam *define.Api2SqlParam) error {
	if len(inputParam.ColumnList) == 0 && wrapper.ArrayType[string]([]string{
		consts.SqlTypeList, consts.SqlTypeDetail,
	}).Has(inputParam.SqlType) >= 0 {
		return errors.New("column list is empty")
	}
	// 验证字段是否都正确
	tableColumnTable := make(map[string]bool)
	for _, itemColumn := range inputParam.TableColumnConfig {
		tableColumnTable[itemColumn.ColumnName] = true
	}
	for _, columnConfig := range inputParam.ColumnList {
		if !tableColumnTable[columnConfig.Column] {
			return errors.New(columnConfig.Column + " : input column not found in table column list")
		}
		if len(columnConfig.Alias) == 0 {
			columnConfig.Alias = columnConfig.Column
		}
	}
	return nil
}

// getTx 获取数据库连接
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:20 2024/8/23
func (e *execute) getTx(ctx context.Context, inputParam *define.Api2SqlParam) (*gorm.DB, error) {
	if nil != inputParam.Tx {
		return inputParam.Tx, nil
	}
	if inputParam.ForceMaster || // 强制操作主库
		wrapper.ArrayType[string]([]string{consts.SqlTypeDelete, consts.SqlTypeInsert, consts.SqlTypeUpdate}).Has(inputParam.SqlType) >= 0 { // 写操作
		return e.databaseClientManager.GetMasterClient(ctx, inputParam.DatabaseFlag)
	}
	return e.databaseClientManager.GetSlaveClient(ctx, inputParam.DatabaseFlag)
}

// getOptionList 设置where条件
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 12:31 2024/8/23
func (e *execute) getOptionList(ctx context.Context, inputParam *define.Api2SqlParam) ([]database.SetOption, error) {
	optionList := []database.SetOption{
		database.WithTable(inputParam.Table),
	}
	// 设置 limit offset
	if !inputParam.ForceNoLimit && inputParam.Limit > 0 {
		optionList = append(optionList, database.WithLimit(inputParam.Limit, inputParam.Offset))
	}
	for _, item := range inputParam.ConditionList {
		optionFunc, err := database.WithAnyCondition(item.Column, item.Operate, item.Value)
		if nil != err {
			return nil, err
		}
		optionList = append(optionList, optionFunc)
	}
	return optionList, nil
}