package response

import (
	"encoding/json"
	"fmt"
	"net/http"
	"reflect"
	"strings"
	"time"

	"affiliate_dash/internal/pkg/timeutil"

	"github.com/gin-gonic/gin"
)

var (
	timeType       = reflect.TypeOf(time.Time{})
	rawMessageType = reflect.TypeOf(json.RawMessage{})
)

type Body struct {
	Code    int         `json:"code"`
	Message string      `json:"message"`
	Data    interface{} `json:"data,omitempty"`
}

func OK(c *gin.Context, data interface{}) {
	WithStatus(c, http.StatusOK, data)
}

func WithStatus(c *gin.Context, httpStatus int, data interface{}) {
	c.JSON(httpStatus, Body{Code: 0, Message: "ok", Data: NormalizeTime(data)})
}

func Fail(c *gin.Context, httpStatus int, code int, message string) {
	c.JSON(httpStatus, Body{Code: code, Message: message})
}

func BadRequest(c *gin.Context, message string) {
	Fail(c, http.StatusBadRequest, 400, message)
}

func Unauthorized(c *gin.Context, message string) {
	Fail(c, http.StatusUnauthorized, 401, message)
}

func Forbidden(c *gin.Context, message string) {
	Fail(c, http.StatusForbidden, 403, message)
}

func NotFound(c *gin.Context, message string) {
	Fail(c, http.StatusNotFound, 404, message)
}

func ServerError(c *gin.Context, message string) {
	Fail(c, http.StatusInternalServerError, 500, message)
}

type PageData struct {
	List  interface{} `json:"list"`
	Total int64       `json:"total"`
	Page  int         `json:"page"`
	Size  int         `json:"size"`
}

func Page(c *gin.Context, list interface{}, total int64, page, size int) {
	OK(c, PageData{List: list, Total: total, Page: page, Size: size})
}

func FormatTime(value time.Time) string {
	return timeutil.FormatAPITime(value)
}

func NormalizeTime(value interface{}) interface{} {
	return normalizeTimeValue(reflect.ValueOf(value))
}

func normalizeTimeValue(value reflect.Value) interface{} {
	if !value.IsValid() {
		return nil
	}
	if value.Kind() == reflect.Interface {
		if value.IsNil() {
			return nil
		}
		return normalizeTimeValue(value.Elem())
	}
	if value.Type() == rawMessageType {
		return value.Interface()
	}
	if value.Type() == timeType {
		if !value.CanInterface() {
			return nil
		}
		return FormatTime(value.Interface().(time.Time))
	}
	switch value.Kind() {
	case reflect.Pointer:
		if value.IsNil() {
			return nil
		}
		if value.Type().Elem() == timeType {
			return FormatTime(value.Elem().Interface().(time.Time))
		}
		return normalizeTimeValue(value.Elem())
	case reflect.Slice, reflect.Array:
		if value.Kind() == reflect.Slice && value.IsNil() {
			return nil
		}
		if value.Type().Elem().Kind() == reflect.Uint8 {
			return value.Interface()
		}
		out := make([]interface{}, 0, value.Len())
		for i := 0; i < value.Len(); i++ {
			out = append(out, normalizeTimeValue(value.Index(i)))
		}
		return out
	case reflect.Map:
		if value.IsNil() {
			return nil
		}
		out := make(map[string]interface{}, value.Len())
		iter := value.MapRange()
		for iter.Next() {
			out[mapKeyString(iter.Key())] = normalizeTimeValue(iter.Value())
		}
		return out
	case reflect.Struct:
		return normalizeTimeStruct(value)
	default:
		if value.CanInterface() {
			return value.Interface()
		}
		return nil
	}
}

func normalizeTimeStruct(value reflect.Value) map[string]interface{} {
	out := make(map[string]interface{}, value.NumField())
	valueType := value.Type()
	for i := 0; i < value.NumField(); i++ {
		field := valueType.Field(i)
		if field.PkgPath != "" {
			continue
		}
		name, skip, omitEmpty := jsonFieldName(field)
		if skip {
			continue
		}
		fieldValue := value.Field(i)
		if omitEmpty && fieldValue.IsZero() {
			continue
		}
		out[name] = normalizeTimeValue(fieldValue)
	}
	return out
}

func jsonFieldName(field reflect.StructField) (string, bool, bool) {
	tag := field.Tag.Get("json")
	if tag == "-" {
		return "", true, false
	}
	if tag == "" {
		return field.Name, false, false
	}
	parts := strings.Split(tag, ",")
	name := parts[0]
	if name == "" {
		name = field.Name
	}
	return name, false, hasTagOption(parts[1:], "omitempty")
}

func hasTagOption(options []string, target string) bool {
	for _, option := range options {
		if option == target {
			return true
		}
	}
	return false
}

func mapKeyString(value reflect.Value) string {
	if value.Kind() == reflect.String {
		return value.String()
	}
	if value.CanInterface() {
		return fmt.Sprint(value.Interface())
	}
	return ""
}