package controllers

import (
	"time"

	"github.com/gofiber/fiber/v2"
	"github.com/google/uuid"
)

const traceIdHeader string = "X-Trace-Id"

type Response[T any] struct {
	Code      int    `json:"code"`
	Message   string `json:"message"`
	Data      T      `json:"data"`
	TraceID   string `json:"traceId"`
	Timestamp int64  `json:"timestamp"`
}

type ResponseNoData struct {
	Code      int    `json:"code"`
	Message   string `json:"message"`
	TraceID   string `json:"traceId"`
	Timestamp int64  `json:"timestamp"`
}

func JSONResponse[T any](c *fiber.Ctx, code int, message string, data T) error {
	traceId := c.Get(traceIdHeader) // 从请求头取
	if traceId == "" {
		traceId = uuid.New().String() // 没有就生成
	}

	// 设置到响应头，让前端也能拿到
	c.Set(traceIdHeader, traceId)

	resp := Response[T]{
		Code:      code,
		Message:   message,
		Data:      data,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	}
	return c.JSON(resp)
}

func JSONResponseNoData(c *fiber.Ctx, code int, message string) error {
	traceId := c.Get(traceIdHeader) // 从请求头取
	if traceId == "" {
		traceId = uuid.New().String() // 没有就生成
	}

	// 设置到响应头，让前端也能拿到
	c.Set(traceIdHeader, traceId)

	resp := ResponseNoData{
		Code:      code,
		Message:   message,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	}
	return c.JSON(resp)
}