// Package define ...
//
// Description : define ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2023-09-17 18:07
package define

import (
	"errors"
	"fmt"
	"git.zhangdeman.cn/zhangdeman/consts"
	"strings"
)

// Index 索引数据结构
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:39 2023/9/17
type Index struct {
	Type      string   `json:"type"`       // 索引类型 : unique / index / key / primary 等
	Name      string   `json:"name"`       // 索引名称
	FieldList []string `json:"field_list"` // 索引字段列表
	IsFormat  bool     `json:"-"`          // 是否格式化
}

// Format 格式化
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:35 2023/9/17
func (i *Index) Format() {
	if i.IsFormat {
		return
	}
	i.IsFormat = true
	i.Type = strings.ToUpper(strings.TrimSpace(i.Type))
	i.Name = strings.TrimSpace(i.Name)
	if !strings.HasPrefix(i.Name, "`") {
		i.Name = "`" + i.Name
	}
	if !strings.HasSuffix(i.Name, "`") {
		i.Name = i.Name + "`"
	}
	for idx := 0; idx < len(i.FieldList); idx++ {
		if !strings.HasPrefix(i.FieldList[idx], "`") {
			i.FieldList[idx] = "`" + i.FieldList[idx]
		}
		if !strings.HasSuffix(i.FieldList[idx], "`") {
			i.FieldList[idx] = i.FieldList[idx] + "`"
		}
	}
}

// Validate 验证数据
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 16:17 2023/9/17
func (i *Index) Validate() error {
	i.Format()
	if len(i.Name) <= 2 {
		return IndexNameIsEmpty
	}
	if len(i.Type) == 0 {
		return IndexTypeIsEmpty
	}
	if len(i.FieldList) == 0 {
		return IndexFieldIsEmpty
	}
	return nil
}

// ToString 生成sql语句
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 17:47 2023/9/17
func (i *Index) ToString(tableName string) (string, error) {
	if err := i.Validate(); nil != err {
		return "", err
	}

	switch DatabaseDriver {
	case consts.DatabaseDriverMysql:
		// 拼接sql
		switch i.Type {
		case TableIndexPrimary:
			return fmt.Sprintf("ALTER TABLE `%v` ADD PRIMARY KEY (%v)", tableName, i.FieldList[0]), nil
		case TableIndexUnique:
			return fmt.Sprintf("ALTER TABLE `%v` ADD UNIQUE KEY %v (%v)", tableName, i.Name, strings.Join(i.FieldList, ",")), nil
		case TableIndexKey:
			return fmt.Sprintf("ALTER TABLE `%v` ADD KEY %v (%v)", tableName, i.Name, strings.Join(i.FieldList, ",")), nil
		case TableIndexIndex:
			return fmt.Sprintf("ALTER TABLE `%v` ADD INDEX %v (%v)", tableName, i.Name, strings.Join(i.FieldList, ",")), nil
		default:
			return fmt.Sprintf("ALTER TABLE `%v` ADD %v %v (%v)", tableName, i.Type, i.Name, strings.Join(i.FieldList, ",")), nil
		}
	case consts.DatabaseDriverSqlite3:
		// 拼接sql
		switch i.Type {
		case TableIndexPrimary:
			return "", nil
			// return fmt.Sprintf("ALTER TABLE %v  ADD CONSTRAINT %v PRIMARY KEY AUTOINCREMENT (%v)", tableName, i.FieldList[0], i.FieldList[0]), nil
		case TableIndexUnique:
			return fmt.Sprintf("CREATE UNIQUE INDEX %v ON %v (%v)", i.Name, tableName, strings.Join(i.FieldList, ",")), nil
		case TableIndexKey:
			fallthrough
		case TableIndexIndex:
			return fmt.Sprintf("CREATE INDEX %v ON %v (%v)", i.Name, tableName, strings.Join(i.FieldList, ",")), nil
		default:
			return fmt.Sprintf("CREATE %v %v ON %v (%v)", i.Type, i.Name, tableName, strings.Join(i.FieldList, ",")), nil
		}
	}
	return "", errors.New(DatabaseDriver + " : database driver is not support")
}

// ToStringIgnoreError ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 15:59 2023/9/18
func (i *Index) ToStringIgnoreError(tableName string) string {
	sql, _ := i.ToString(tableName)
	return sql
}