package system

import (
	"context"
	"errors"
	"path/filepath"

	"github.com/go-kratos/kratos/v2/log"
	"gorm.io/driver/sqlserver"
	"gorm.io/gorm"
)

// MssqlConfig MSSQL配置
type MssqlConfig struct {
	Path         string
	Port         string
	Config       string
	Dbname       string
	Username     string
	Password     string
	MaxIdleConns int
	MaxOpenConns int
	LogMode      string
}

// Dsn 生成MSSQL DSN
func (c *MssqlConfig) Dsn() string {
	return "sqlserver://" + c.Username + ":" + c.Password + "@" + c.Path + ":" + c.Port + "?database=" + c.Dbname + "&encrypt=disable"
}

// MssqlInitHandler MSSQL初始化处理器
type MssqlInitHandler struct {
	log          *log.Helper
	configWriter func(ctx context.Context, dbType string, config interface{}) error
}

// NewMssqlInitHandler 创建MSSQL初始化处理器
func NewMssqlInitHandler(logger *log.Helper, configWriter func(ctx context.Context, dbType string, config interface{}) error) *MssqlInitHandler {
	return &MssqlInitHandler{
		log:          logger,
		configWriter: configWriter,
	}
}

// WriteConfig mssql回写配置
func (h *MssqlInitHandler) WriteConfig(ctx context.Context) error {
	c, ok := ctx.Value("config").(MssqlConfig)
	if !ok {
		return errors.New("mssql config invalid")
	}
	if h.configWriter != nil {
		return h.configWriter(ctx, "mssql", c)
	}
	return nil
}

// EnsureDB 创建数据库并初始化 mssql
func (h *MssqlInitHandler) EnsureDB(ctx context.Context, conf *InitDBRequest) (next context.Context, err error) {
	if s, ok := ctx.Value("dbtype").(string); !ok || s != "mssql" {
		return ctx, ErrDBTypeMismatch
	}

	c := h.toMssqlConfig(conf)
	next = context.WithValue(ctx, "config", c)
	if c.Dbname == "" {
		return ctx, nil
	} // 如果没有数据库名, 则跳出初始化数据

	dsn := h.mssqlEmptyDsn(conf)

	mssqlConfig := sqlserver.Config{
		DSN:               dsn, // DSN data source name
		DefaultStringSize: 191, // string 类型字段的默认长度
	}

	var db *gorm.DB

	if db, err = gorm.Open(sqlserver.New(mssqlConfig), &gorm.Config{DisableForeignKeyConstraintWhenMigrating: true}); err != nil {
		return nil, err
	}

	// 设置AutoCode根目录
	autoCodeRoot, _ := filepath.Abs("..")
	next = context.WithValue(next, "autoCodeRoot", autoCodeRoot)
	next = context.WithValue(next, "db", db)
	return next, err
}

// InitTables 初始化表
func (h *MssqlInitHandler) InitTables(ctx context.Context, inits InitSlice) error {
	return createTables(ctx, inits)
}

// InitData 初始化数据
func (h *MssqlInitHandler) InitData(ctx context.Context, inits InitSlice) error {
	next, cancel := context.WithCancel(ctx)
	defer cancel()
	for _, init := range inits {
		if init.DataInserted(next) {
			h.log.Infof(InitDataExist, Mssql, init.InitializerName())
			continue
		}
		if n, err := init.InitializeData(next); err != nil {
			h.log.Errorf(InitDataFailed, Mssql, init.InitializerName(), err)
			return err
		} else {
			next = n
			h.log.Infof(InitDataSuccess, Mssql, init.InitializerName())
		}
	}
	h.log.Infof(InitSuccess, Mssql)
	return nil
}

// mssqlEmptyDsn mssql 空数据库 建库链接
func (h *MssqlInitHandler) mssqlEmptyDsn(i *InitDBRequest) string {
	return "sqlserver://" + i.UserName + ":" + i.Password + "@" + i.Host + ":" + i.Port + "?database=" + i.DBName + "&encrypt=disable"
}

// toMssqlConfig 转换为MSSQL配置
func (h *MssqlInitHandler) toMssqlConfig(i *InitDBRequest) MssqlConfig {
	return MssqlConfig{
		Path:         i.Host,
		Port:         i.Port,
		Dbname:       i.DBName,
		Username:     i.UserName,
		Password:     i.Password,
		MaxIdleConns: 10,
		MaxOpenConns: 100,
		LogMode:      "error",
	}
}