package handler

import (
	"net/http"
	"strconv"

	"fashionapi/internal/dto"
	"fashionapi/internal/middleware"
	"fashionapi/internal/pkg/response"
	"fashionapi/internal/service"

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

// HistoryHandler 浏览历史接口（需 Bearer 鉴权，挂在 /api/v1/auth 下）。
type HistoryHandler struct {
	hist service.HistoryService
}

// NewHistoryHandler 创建浏览历史 handler。
func NewHistoryHandler(hist service.HistoryService) *HistoryHandler {
	return &HistoryHandler{hist: hist}
}

// List 当前用户浏览历史（服务端分页）。
//
// GET /api/v1/auth/history?page=1&per_page=24
// 成功：200 { data: { items:[...], total, last_page } }
func (h *HistoryHandler) List(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	perPage, _ := strconv.Atoi(c.DefaultQuery("per_page", "24"))
	if page < 1 {
		page = 1
	}
	if perPage < 1 || perPage > 100 {
		perPage = 24
	}
	items, total, err := h.hist.ListPaged(c.Request.Context(), userID, page, perPage)
	if err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{
		"items":     items,
		"total":     total,
		"last_page": response.LastPage(total, perPage),
	})
}

// Record 记录一次浏览（点开文章详情；upsert：同文章刷新时间，不新增行）。
//
// POST /api/v1/auth/history
// body: { target_uid }   // 带 r=/s= 前缀的对外编码串
// 成功：200 { data: { ok: true } }
func (h *HistoryHandler) Record(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	var req dto.HistoryAdd
	if err := c.ShouldBindJSON(&req); err != nil {
		response.Error(c, http.StatusBadRequest, "invalid request")
		return
	}
	if err := h.hist.Record(c.Request.Context(), userID, req); err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{"ok": true})
}

// Remove 删除一条历史。
//
// DELETE /api/v1/auth/history/:target_uid
// 成功：200 { data: { ok: true } }
func (h *HistoryHandler) Remove(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	uid := c.Param("target_uid")
	if err := h.hist.Remove(c.Request.Context(), userID, uid); err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{"ok": true})
}

// Clear 清空当前用户全部历史。
//
// DELETE /api/v1/auth/history
// 成功：200 { data: { ok: true } }
func (h *HistoryHandler) Clear(c *gin.Context) {
	userID, ok := middleware.UserIDFrom(c)
	if !ok {
		response.Error(c, http.StatusUnauthorized, "unauthorized")
		return
	}
	if err := h.hist.Clear(c.Request.Context(), userID); err != nil {
		fail(c, err)
		return
	}
	response.Data(c, http.StatusOK, gin.H{"ok": true})
}