// Package define ...
//
// Description : define ...
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 2023-09-17 11:19
package define

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

var (
	DatabaseDriver = consts.DatabaseDriverMysql
)

// SetDatabaseDriver 设置数据库驱动
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:48 2024/6/17
func SetDatabaseDriver(databaseDriver string) {
	DatabaseDriver = databaseDriver
}

// Table 数据表的数据结构
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 11:22 2023/9/17
type Table struct {
	Name           string   `json:"name"`            // 表名称
	Engine         string   `json:"engine"`          // 存储引擎
	DefaultCharset string   `json:"default_charset"` // 默认编码
	DefaultCollate string   `json:"default_collate"` // 默认集合
	Comment        string   `json:"comment"`         // 表注释
	AutoIncrement  int      `json:"auto_increment"`  // 自增起始值
	FieldList      []*Field `json:"field_list"`      // 表字段列表
	IndexList      []*Index `json:"index_list"`      // 表索引列表
	isFormat       bool     `json:"-"`               // 是否格式化过
}

// Format 格式化
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:14 2023/9/17
func (t *Table) Format() {
	if t.isFormat {
		return
	}
	t.isFormat = true
	t.Name = strings.TrimSpace(t.Name)
	t.Engine = strings.TrimSpace(t.Engine)
	if len(t.Engine) == 0 {
		t.Engine = "InnoDB"
	}
	t.DefaultCharset = strings.TrimSpace(t.DefaultCharset)
	if len(t.DefaultCharset) == 0 {
		t.DefaultCharset = "utf8mb4"
	}
	t.DefaultCollate = strings.TrimSpace(t.DefaultCollate)
	if len(t.DefaultCollate) == 0 {
		t.DefaultCollate = "utf8mb4_general_ci"
	}
	for _, item := range t.FieldList {
		item.Format()
	}
	for _, item := range t.IndexList {
		item.Format()
	}
}

// Validate 数据验证
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:23 2023/9/17
func (t *Table) Validate() error {
	t.Format()
	if len(t.Name) <= 2 {
		return TableNameIsEmpty
	}
	if len(t.FieldList) == 0 {
		return TableFieldListIsEmpty
	}
	return nil
}

// ToString 生成sql
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 18:46 2023/9/17
func (t *Table) ToString() ([]string, error) {
	tableTpl := t.getTableSqlTpl()
	replaceTable := map[string]string{
		TableName:           t.Name, // 表名
		TableFieldList:      "",     // 表字段
		TableIndexList:      "",     // 表索引
		TableEngine:         "",     // 表引擎
		TableAutoIncrement:  "",     // 自增起点
		TableDefaultCharset: "",     // 默认编码
		TableDefaultCollate: "",     // 默认字符集
		TableComment:        "",     // 表注释
	}
	fieldList := make([]string, 0)
	for _, item := range t.FieldList {
		fieldStr, err := item.ToString()
		if nil != err {
			return nil, err
		}
		fieldList = append(fieldList, fieldStr)
	}
	indexList := make([]string, 0)
	for _, item := range t.IndexList {
		indexStr, err := item.ToString(t.Name)
		if nil != err {
			return nil, err
		}
		if len(indexStr) == 0 {
			continue
		}
		indexList = append(indexList, indexStr)
	}
	replaceTable[TableFieldList] = strings.Join(fieldList, ",")
	replaceTable[TableIndexList] = strings.Join(indexList, ",")

	if len(t.Engine) > 0 {
		replaceTable[TableEngine] = "ENGINE=" + t.Engine
	}
	if t.AutoIncrement > 0 {
		replaceTable[TableAutoIncrement] = fmt.Sprintf("AUTO_INCREMENT=%v", t.AutoIncrement)
	}

	if len(t.DefaultCharset) > 0 {
		replaceTable[TableDefaultCharset] = "DEFAULT CHARSET=" + t.DefaultCharset
	}
	if len(t.DefaultCollate) > 0 {
		if len(replaceTable[TableDefaultCharset]) == 0 {
			replaceTable[TableDefaultCollate] = "DEFAULT COLLATE=" + t.DefaultCollate
		} else {
			replaceTable[TableDefaultCollate] = "COLLATE=" + t.DefaultCollate
		}
	}
	if len(t.Comment) > 0 {
		replaceTable[TableComment] = fmt.Sprintf("COMMENT='%v'", t.Comment)
	}
	for source, target := range replaceTable {
		tableTpl = strings.ReplaceAll(tableTpl, source, target)
	}

	return append([]string{tableTpl}, indexList...), nil
}

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

// getTableSqlTpl 获取表结构的模板
//
// Author : go_developer@163.com<白茶清欢>
//
// Date : 14:50 2024/6/17
func (t *Table) getTableSqlTpl() string {
	switch DatabaseDriver {
	case consts.DatabaseDriverMysql:
		return MysqlTableTpl
	case consts.DatabaseDriverSqlite3:
		return SqliteTableTpl
	}
	panic(DatabaseDriver + " : database driver is not support")
}