package tmpl

import (
	"bufio"
	"fmt"
	"os"
	"strings"
	"text/template"
	"xorm.io/xorm"
)

type MTable struct {
	Name       string    //数据库表名
	GreatHump  string    //大驼峰名称
	LittleHump string    //小驼峰
	Comment    string    //注释
	ExistId    bool      //是否存在id
	MColumns   []MColumn //字段
}

type MColumn struct {
	Name        string //数据库名称
	GreatHump   string //大驼峰名称
	LittleHump  string //小驼峰
	Comment     string //注释
	SqlTypeName string //数据库类型
	TypeName    string //go 类型
	VueTypeName string //vue对应类型
	Length      int64  //长度
	Length2     int64  //小数点长度
	IsKey       bool   //主键
}

// LoadStructTemplate 加载结构体生成模板
func LoadStructTemplate(url string) {
	os.Truncate(url, 0)
	file, _ := os.OpenFile(url, os.O_CREATE|os.O_RDWR, 0666)
	defer file.Close()
	//os.Stdout
	writer := bufio.NewWriter(file)

	t, err := template.ParseFiles("./tmpl/struct.go.template")
	if err != nil {
		panic(err)
	}
	err = t.Execute(writer, MTables)
	if err != nil {
		panic(err)
	}
}

// LoadDaoTemplate 加载Dao生成模板
func LoadDaoTemplate(url string) {
	os.Truncate(url, 0)
	file, _ := os.OpenFile(url, os.O_CREATE|os.O_RDWR, 0666)
	defer file.Close()

	writer := bufio.NewWriterSize(file, 1<<31)

	t, err := template.ParseFiles("./tmpl/dao.go.template")
	if err != nil {
		panic(err)
	}
	err = t.Execute(writer, MTables)
	if err != nil {
		panic(err)
	}
}

func (receiver MTable) String() string {
	return fmt.Sprintf("Name:%s,Comment:%s,MColumns:%s\n\n\n", receiver.Name, receiver.Comment, receiver.MColumns)
}
func (receiver MColumn) String() string {
	return fmt.Sprintf("Name:%s,AaBbName:%s,aaBbName:%s,Comment:%s,SqlTypeName:%s,TypeName:%s,Length:%d,Length2:%d\n",
		receiver.Name, receiver.GreatHump, receiver.LittleHump, receiver.Comment, receiver.SqlTypeName, receiver.TypeName, receiver.Length, receiver.Length2)
}

var MTables = make([]MTable, 0)

// InitMTableArray 初始化加载数据库结构并存储
func InitMTableArray(engine *xorm.Engine) {
	if len(MTables) > 0 {
		return
	}
	metas, err := engine.DBMetas()
	if err != nil {
		fmt.Println(err)
	}
	for _, meta := range metas {
		var mTable MTable
		mTable.Name = meta.Name
		mTable.GreatHump, mTable.LittleHump = formatName(meta.Name)
		mTable.Comment = meta.Comment

		var cols = meta.Columns()
		for i := range cols {
			var mColumn MColumn
			mColumn.Name = cols[i].Name
			mColumn.GreatHump, mColumn.LittleHump = formatName(cols[i].Name)
			mColumn.IsKey = cols[i].IsPrimaryKey

			if cols[i].IsPrimaryKey && cols[i].IsAutoIncrement {
				mTable.ExistId = true
			}
			mColumn.Comment = cols[i].Comment
			mColumn.SqlTypeName = cols[i].SQLType.Name
			mColumn.TypeName = formatSqlType(mColumn.SqlTypeName)
			mColumn.VueTypeName = formatSqlToVueType(mColumn.SqlTypeName)
			mColumn.Length = cols[i].Length
			mColumn.Length2 = cols[i].Length2
			mTable.MColumns = append(mTable.MColumns, mColumn)

		}
		MTables = append(MTables, mTable)
	}
}

// 将名字修改成大驼峰和小驼峰的格式进行返回
func formatName(name string) (string, string) {
	split := strings.Split(strings.ToLower(name), "_")
	if len(split) == 1 {
		return strings.ToUpper(split[0][0:1]) + split[0][1:], split[0]
	} else {
		AaBb := ""
		aaBb := ""
		for j := range split {
			AaBb += strings.ToUpper(split[j][0:1]) + split[j][1:]
			if j == 0 {
				aaBb += split[j]
			} else {
				aaBb += strings.ToUpper(split[j][0:1]) + split[j][1:]
			}
		}
		return AaBb, aaBb
	}
}

func formatSqlToVueType(str string) string {
	str = strings.ToLower(str)
	switch str {
	case "varchar":
		return "string"
	case "int":
		return "number"
	case "decimal":
		return "number"
	case "datetime":
		return "string"
	case "longblob":
		return "string"
	case "char":
		return "string"
	default:
		panic("未定义的类型：" + str)
	}
}
func formatSqlType(str string) string {
	str = strings.ToLower(str)
	switch str {
	case "varchar":
		return "string"
	case "int":
		return "int64"
	case "decimal":
		return "float64"
	case "datetime":
		return "time.Time"
	case "longblob":
		return "string"
	case "char":
		return "string"
	default:
		panic("未定义的类型：" + str)
	}
}