package base

import (
	"encoding/json"
	"fmt"
	"reflect"
	"strconv"
	"strings"

	"git.fsdpf.net/go/db"
	"git.fsdpf.net/go/db/schema"
	"git.fsdpf.net/go/req"
	"github.com/spf13/cast"
)

// ResField 资源字段
type ResField struct {
	Uuid         string          `db:"uuid" json:"uuid"`
	Name         string          `db:"name" json:"name"`
	Code         string          `db:"code" json:"code"`
	CodeResource string          `db:"codeResource" json:"codeResource"`
	DataType     req.ResDataType `db:"data_type" json:"data_type"`
	Length       string          `db:"length" json:"length"`
	Comment      string          `db:"comment" json:"comment"`
	Default      string          `db:"default" json:"default"`
	Virtual      bool            `db:"virtual" json:"virtual"`
	VirtualExpr  string          `db:"virtual_expr" json:"virtual_expr"`
}

func (this ResField) ToStructField(tags ...string) reflect.StructField {
	var typ reflect.Type

	fCode := this.Code
	fTag := `db:"` + fCode + `" json:"` + fCode + `"`

	if len(tags) > 0 {
		fTag = strings.Join(tags, " ") + " " + fTag
	}

	switch this.DataType {
	case req.ResString, req.ResText, req.ResEnum,
		req.ResTimestamp, req.ResDate, req.ResDatetime:
		typ = reflect.TypeOf(string(""))
	case req.ResInteger, req.ResSmallInteger:
		typ = reflect.TypeOf(int64(0))
	case req.ResDecimal:
		typ = reflect.TypeOf(float64(0))
	case req.ResBoolean:
		typ = reflect.TypeOf(true)
	case req.ResJson:
		if this.Default != "" && this.Default[0:1] == "[" {
			typ = reflect.TypeOf([]any{})
		} else {
			typ = reflect.TypeOf(map[string]any{})
		}
	}

	return reflect.StructField{
		Name: strings.ToUpper(fCode[:1]) + fCode[1:],
		Tag:  reflect.StructTag(fTag),
		Type: typ,
	}
}

func (this ResField) IsVirtual() bool {
	return this.Virtual
}

func (this ResField) GetCode() string {
	return this.Code
}

func (this ResField) GetCodeResource() string {
	return this.CodeResource
}

func (this ResField) GetName() string {
	return this.Name
}

func (this ResField) GetDataType() req.ResDataType {
	return this.DataType
}

func (this ResField) GetQueryDataType() req.RouteParamType {
	switch this.GetDataType() {
	case req.ResEnum,
		req.ResTimestamp, req.ResDate,
		req.ResDatetime, req.ResString,
		req.ResText:
		return req.ReqString
	case req.ResInteger, req.ResSmallInteger:
		return req.ReqInteger
	case req.ResDecimal:
		return req.ReqFloat
	case req.ResBoolean:
		return req.ReqBool
	case req.ResJson:
		if this.Default != "" && this.Default[0:1] == "[" {
			return req.ReqArray
		}
		return req.ReqJson
	}
	return req.ReqString
}

func (this ResField) ToValue(v any) any {
	if this.DataType == req.ResJson {
		if v == nil {
			if this.Default != "" && this.Default[0:1] == "[" {
				return db.V("[]")
			} else if this.Default != "" && this.Default[0:1] == "{" {
				return db.V("{}")
			} else if this.Default == "" {
				return db.V("{}")
			}
			return this.GetRawDefault()
		}

		if str, ok := v.(string); ok {
			return str
		} else if raw, ok := v.(db.Expression); ok {
			return raw
		} else if b, err := json.Marshal(v); err == nil {
			return string(b)
		} else {
			panic(fmt.Sprintf("%s, 类型转换错误, %s", this.Code, err))
		}
	}
	return v
}

func (this ResField) GetRawDefault() db.Expression {
	if this.DataType == req.ResJson {
		if this.Default != "" && this.Default[0:1] == "[" {
			return db.V("[]")
		} else if this.Default != "" && this.Default[0:1] == "{" {
			return db.V("{}")
		} else if this.Default == "" {
			return db.V("{}")
		}
	} else if this.DataType == req.ResBoolean {
		if v, _ := strconv.ParseBool(this.Default); v {
			return db.V(true)
		}
		return db.V(false)
	}

	if len(this.Default) > 4 && strings.ToLower(this.Default[0:4]) == "sql:" {
		return db.L(this.Default[4:])
	}

	if this.Default == "" {
		if this.GetDataType() == req.ResDate || this.GetDataType() == req.ResDatetime {
			return db.V(nil)
		}
		return db.V("")
	}

	if strings.ToUpper(this.Default) == "CURRENT_TIMESTAMP" {
		return db.L(this.Default)
	}

	return db.V(this.Default)
}

func (this ResField) ToBlueprint(table *schema.Blueprint) (temp *schema.ColumnDefinition) {
	switch this.Code {
	case "id":
		return table.BigIncrements("id").AutoIncrement().Comment("ID")
	case "enabled":
		return table.Boolean("enabled").Default("1").Comment("是否有效")
	case "created_user":
		return table.Char("created_user", 36).Default("00000000-0000-0000-0000-000000000000").Comment("创建者")
	case "owned_user":
		return table.Char("owned_user", 36).Default("00000000-0000-0000-0000-000000000000").Comment("拥有者")
	case "created_at":
		return table.Timestamp("created_at").UseCurrent().Comment("创建时间")
	case "updated_at":
		return table.Timestamp("updated_at").UseCurrent().Default(db.L("ON UPDATE CURRENT_TIMESTAMP")).Comment("更新时间")
	case "deleted_at":
		return table.DateTime("deleted_at").Nullable().Comment("删除时间")
	}

	isNull := false
	comment := this.Name
	def := any(this.Default)

	if this.Comment != "" {
		comment += " [ " + strings.Trim(this.Comment, `' "`) + " ]"
	}

	switch this.DataType {
	case "string":
		len := 255
		if v, err := strconv.Atoi(strings.Trim(this.Length, `' "`)); err == nil {
			len = v
		}
		temp = table.String(this.Code, len)
	case "smallInteger":
		// integer 默认长度 4
		temp = table.SmallInteger(this.Code)
	case "boolean":
		// integer 默认长度 1
		temp = table.Boolean(this.Code)
	case "integer":
		// integer 默认长度 11
		temp = table.Integer(this.Code)
	case "date", "dateTime", "timestamp":
		if this.DataType == "date" {
			temp = table.Date(this.Code)
		} else {
			temp = table.DateTime(this.Code)
		}

		if strings.ToUpper(this.Default) == "SQL:CURRENT_TIMESTAMP" {
			def = db.L("CURRENT_TIMESTAMP")
		} else if def == "" {
			isNull = true
		}
	case "decimal":
		allowed := strings.SplitN(this.Length, ",", 2)
		total := 8
		places := 2
		if v, err := strconv.Atoi(strings.Trim(allowed[0], `' "`)); err == nil {
			total = v
		}
		if v, err := strconv.Atoi(strings.Trim(allowed[1], `' "`)); err == nil {
			places = v
		}
		temp = table.Decimal(this.Code, total, places)
	case "enum":
		allowed := []string{}
		for _, v := range strings.Split(this.Length, ",") {
			allowed = append(allowed, strings.Trim(v, `' "`))
		}
		temp = table.Enum(this.Code, allowed)
	case "json":
		temp = table.Json(this.Code)
		isNull = true
	case "text":
		temp = table.Text(this.Code)
		isNull = true
	case "vector":
		temp = table.Vector(this.Code, cast.ToInt(this.Length))
		isNull = false
	default:
		panic(fmt.Sprintf("Unknown type: %s", this.DataType))
	}

	if this.IsVirtual() {
		temp.VirtualAs(this.VirtualExpr)
	}

	if isNull {
		temp.Nullable()
	} else {
		temp.Default(def)
	}

	temp.Comment(comment)

	return temp
}

func (this ResField) ToQueryField(t req.RouteParamType, alias string, options byte) req.QueryField {
	o := &QueryField{
		ResField: this,
		typ:      t,
		alias:    alias,
	}

	return o.SetOptions(options)
}