package rest

import (
	"gorm.io/gorm/schema"
	"reflect"
	"strings"
	"time"
)

var (
	timeKind    = reflect.TypeOf(time.Time{}).Kind()
	timePtrKind = reflect.TypeOf(&time.Time{}).Kind()
)

//dataTypeOf 推断数据的类型
func dataTypeOf(field *schema.Field) string {
	var dataType string
	reflectType := field.FieldType
	for reflectType.Kind() == reflect.Ptr {
		reflectType = reflectType.Elem()
	}
	dataValue := reflect.Indirect(reflect.New(reflectType))
	switch dataValue.Kind() {
	case reflect.Bool:
		dataType = TypeBoolean
	case reflect.Int8, reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		dataType = TypeInteger
	case reflect.Float32, reflect.Float64:
		dataType = TypeFloat
	default:
		dataType = TypeString
	}
	return dataType
}

//dataFormatOf 推断数据的格式
func dataFormatOf(field *schema.Field) string {
	var format string
	format = field.Tag.Get("format")
	if format != "" {
		return format
	}
	//如果有枚举值，直接设置为下拉类型
	enum := field.Tag.Get("enum")
	if enum != "" {
		return FormatDropdown
	}
	reflectType := field.FieldType
	for reflectType.Kind() == reflect.Ptr {
		reflectType = reflectType.Elem()
	}
	//时间处理
	dataValue := reflect.Indirect(reflect.New(reflectType))
	if field.Name == "CreatedAt" || field.Name == "UpdatedAt" || field.Name == "DeletedAt" {
		switch dataValue.Kind() {
		case reflect.Int8, reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
			return FormatTimestamp
		default:
			return FormatDatetime
		}
	}
	if strings.Contains(strings.ToLower(field.Name), "pass") {
		return FormatPassword
	}
	switch dataValue.Kind() {
	case timeKind, timePtrKind:
		format = FormatDatetime
	case reflect.Bool:
		format = FormatBoolean
	case reflect.Int8, reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint8, reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		format = FormatInteger
	case reflect.Float32, reflect.Float64:
		format = FormatFloat
	case reflect.Struct:
		if _, ok := dataValue.Interface().(time.Time); ok {
			format = FormatDatetime
		}
	default:
		if field.Size >= 1024 {
			format = FormatText
		} else {
			format = FormatString
		}
	}
	return format
}

//generateFieldName 生成字段名称
func generateFieldName(name string) string {
	tokens := strings.Split(name, "_")
	for i, s := range tokens {
		tokens[i] = strings.Title(s)
	}
	return strings.Join(tokens, " ")
}

//generateFieldScenario 生成数据的显示场景
func generateFieldScenario(index int, field *schema.Field) Scenarios {
	var ss Scenarios
	if v, ok := field.Tag.Lookup("scenarios"); ok {
		v = strings.TrimSpace(v)
		if v != "" {
			ss = strings.Split(v, ";")
		}
	} else {
		if field.PrimaryKey {
			ss = []string{ScenarioList, ScenarioView, ScenarioExport}
		} else if field.Name == "CreatedAt" || field.Name == "UpdatedAt" {
			ss = []string{ScenarioList}
		} else if field.Name == "DeletedAt" || field.Name == "Namespace" {
			//不添加任何显示场景
			ss = []string{}
		} else {
			if index < 10 {
				//高级字段只配置一些简单的场景
				ss = []string{ScenarioSearch, ScenarioList, ScenarioCreate, ScenarioUpdate, ScenarioView, ScenarioExport}
			} else {
				//高级字段只配置一些简单的场景
				ss = []string{ScenarioCreate, ScenarioUpdate, ScenarioView, ScenarioExport}
			}
		}
	}
	return ss
}

//generateFieldRule 生成字段的规则
func generateFieldRule(field *schema.Field) Rule {
	r := Rule{
		Required: []string{},
	}
	if field.GORMDataType == schema.String {
		r.Max = field.Size
	}
	if field.GORMDataType == schema.Int || field.GORMDataType == schema.Float || field.GORMDataType == schema.Uint {
		r.Max = field.Scale
	}
	if field.NotNull {
		r.Required = []string{ScenarioCreate, ScenarioUpdate}
	}
	if field.PrimaryKey {
		r.Unique = true
	}
	return r
}

// generateFieldAttribute 生成数据属性
func generateFieldAttribute(field *schema.Field) Attribute {
	attr := Attribute{
		Match:        MatchFuzzy,
		PrimaryKey:   field.PrimaryKey,
		DefaultValue: field.DefaultValue,
		Readonly:     []string{},
		Disable:      []string{},
		Visible:      make([]VisibleCondition, 0),
		Values:       make([]EnumValue, 0),
		Live:         LiveValue{},
		Description:  "",
	}
	//赋值属性
	props := field.Tag.Get("props")
	if props != "" {
		vs := strings.Split(props, ";")
		for _, str := range vs {
			kv := strings.SplitN(str, ":", 2)
			if len(kv) != 2 {
				continue
			}
			switch strings.ToLower(kv[0]) {
			case "icon":
				attr.Icon = kv[1]
			case "suffix":
				attr.Suffix = kv[1]
			case "tooltip":
				attr.Tooltip = kv[1]
			case "description":
				attr.Description = kv[1]
			case "live":
				//在线数据解析
				ss := strings.Split(kv[1], ",")
				for _, s := range ss {
					if len(s) == 0 {
						continue
					}
					attr.Live.Enable = true
					if s == LiveTypeDropdown || s == LiveTypeCascader {
						attr.Live.Type = s
					} else if s[0] == '/' || strings.HasPrefix(s, "http") {
						attr.Live.Url = s
					} else {
						if strings.IndexByte(s, '.') > -1 {
							attr.Live.Columns = strings.Split(s, ".")
						}
					}
				}
			}
		}
	}
	//赋值枚举值
	enumns := field.Tag.Get("enum")
	if enumns != "" {
		vs := strings.Split(enumns, ";")
		for _, str := range vs {
			kv := strings.SplitN(str, ":", 2)
			if len(kv) != 2 {
				continue
			}
			fv := EnumValue{Value: kv[0]}
			//颜色分隔符
			if pos := strings.IndexByte(kv[1], '#'); pos > -1 {
				fv.Label = kv[1][:pos]
				fv.Color = kv[1][pos:]
			} else {
				fv.Label = kv[1]
			}
			attr.Values = append(attr.Values, fv)
		}
	}
	if !field.Creatable {
		attr.Disable = append(attr.Disable, ScenarioCreate)
	}
	if !field.Updatable {
		attr.Disable = append(attr.Disable, ScenarioUpdate)
	}
	attr.Tooltip = field.Comment
	return attr
}