package controllers

import (
	"fwh-toolbox-server/dto"
	"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 ResponsePage[T any] struct {
	Code      int    `json:"code"`
	Message   string `json:"message"`
	Data      []T    `json:"data"`
	PageSize  uint   `json:"pageSize"`
	PageNum   uint   `json:"pageNum"`
	Total     uint   `json:"total"`
	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"`
}

// 成功返回 200
func Success[T any](c *fiber.Ctx, data T, msg ...string) error {
	message := "success"
	if len(msg) > 0 {
		message = msg[0]
	}

	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)
	}

	return c.Status(fiber.StatusOK).JSON(Response[T]{
		Code:      0,
		Message:   message,
		Data:      data,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 成功返回 200
func SuccessPage[T any](c *fiber.Ctx, data *dto.ResPage[T], msg ...string) error {
	message := "success"
	if len(msg) > 0 {
		message = msg[0]
	}

	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)
	}

	return c.Status(fiber.StatusOK).JSON(ResponsePage[T]{
		Code:      0,
		Message:   message,
		Data:      data.Data,
		PageSize:  data.PageSize,
		PageNum:   data.PageNum,
		Total:     data.Total,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 失败返回 400
func Fail(c *fiber.Ctx, msg 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)
	}

	return c.Status(fiber.StatusBadRequest).JSON(ResponseNoData{
		Code:      1,
		Message:   msg,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 401 未认证
func Unauthorized(c *fiber.Ctx, msg ...string) error {
	message := "unauthorized"
	if len(msg) > 0 {
		message = msg[0]
	}

	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)
	}

	return c.Status(fiber.StatusUnauthorized).JSON(ResponseNoData{
		Code:      401,
		Message:   message,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 403 禁止访问
func Forbidden(c *fiber.Ctx, msg ...string) error {
	message := "forbidden"
	if len(msg) > 0 {
		message = msg[0]
	}

	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)
	}

	return c.Status(fiber.StatusForbidden).JSON(ResponseNoData{
		Code:      403,
		Message:   message,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 404 或无数据
func NotFound(c *fiber.Ctx, msg ...string) error {
	message := "not found"
	if len(msg) > 0 {
		message = msg[0]
	}

	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)
	}

	return c.Status(fiber.StatusNotFound).JSON(ResponseNoData{
		Code:      1,
		Message:   message,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}

// 空响应（204 No Content）
func NoContent(c *fiber.Ctx) error {
	return c.SendStatus(fiber.StatusNoContent)
}

// 服务器错误 500
func Error(c *fiber.Ctx, msg 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)
	}

	return c.Status(fiber.StatusInternalServerError).JSON(ResponseNoData{
		Code:      500,
		Message:   msg,
		TraceID:   traceId,
		Timestamp: time.Now().UnixMilli(),
	})
}