package adminhandler

import (
	"archive/zip"
	"bytes"
	"encoding/csv"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"

	adminlogic "spark-server/internal/module/admin/logic"
	"spark-server/internal/pkg/errs"
)

type Handler struct {
	svc *adminlogic.Service
}

func New(svc *adminlogic.Service) *Handler {
	return &Handler{svc: svc}
}

func (h *Handler) ready(c *gin.Context) bool {
	if h == nil || h.svc == nil {
		Fail(c, http.StatusServiceUnavailable, "admin 服务未就绪")
		return false
	}
	return true
}

func (h *Handler) ImStats(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	out, err := h.svc.ImStats(c.Request.Context())
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, out)
}

func (h *Handler) ImMessages(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "100"))
	list, err := h.svc.ListMessages(c.Request.Context(), c.Query("q"), limit, c.Query("start"), c.Query("end"))
	if err != nil {
		if errors.Is(err, errs.ErrInvalidArgument) {
			msg := "start/end 无效"
			if ae, ok := errs.AsAppError(err); ok && ae.CustomMsg() {
				msg = ae.Msg
			}
			Fail(c, http.StatusBadRequest, msg)
			return
		}
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, gin.H{"messages": list, "count": len(list)})
}

func (h *Handler) ImConversations(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	userID, _ := strconv.ParseInt(c.DefaultQuery("userId", "0"), 10, 64)
	convs, groups, stats, err := h.svc.ListConversations(c.Request.Context(), userID)
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	if userID <= 0 {
		OK(c, gin.H{"stats": stats, "note": "传 userId 可查看该用户会话；否则仅返回统计"})
		return
	}
	OK(c, gin.H{"conversations": convs, "groups": groups})
}

func (h *Handler) ListGroups(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	list, err := h.svc.ListGroups(c.Request.Context(), c.Query("q"))
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, list)
}

func (h *Handler) GroupDetail(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	g, err := h.svc.GroupDetail(c.Request.Context(), c.Param("groupId"))
	if err != nil {
		if errors.Is(err, errs.ErrNotFound) {
			Fail(c, http.StatusNotFound, "群不存在")
			return
		}
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, g)
}

func (h *Handler) UpsertGroup(c *gin.Context) {
	Fail(c, http.StatusBadRequest, "V3 群由客户端创建；请使用 DELETE 解散已有群")
}

func (h *Handler) DeleteGroup(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	if err := h.svc.DissolveGroup(c.Request.Context(), c.Param("groupId")); err != nil {
		if errors.Is(err, errs.ErrNotFound) {
			Fail(c, http.StatusNotFound, "群不存在")
			return
		}
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OKMsg(c, "已解散", nil)
}

func (h *Handler) ExportGroupZip(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	g, err := h.svc.GroupDetail(c.Request.Context(), c.Param("groupId"))
	if err != nil {
		c.Status(http.StatusNotFound)
		return
	}
	buf := &bytes.Buffer{}
	zw := zip.NewWriter(buf)
	csvBuf := &bytes.Buffer{}
	w := csv.NewWriter(csvBuf)
	_ = w.Write([]string{"userId", "email", "nickname", "role"})
	for i := range g.Members {
		m := &g.Members[i]
		_ = w.Write([]string{
			strconv.FormatInt(m.UserID, 10), m.Email, m.Nickname, m.Role,
		})
	}
	w.Flush()
	f1, _ := zw.Create("members.csv")
	_, _ = f1.Write(csvBuf.Bytes())
	msgJSON, _ := json.Marshal(g.Messages)
	f2, _ := zw.Create("messages.json")
	_, _ = f2.Write(msgJSON)
	_ = zw.Close()
	c.Header("Content-Disposition", fmt.Sprintf(`attachment; filename="group-%s.zip"`, g.GroupID))
	c.Data(http.StatusOK, "application/zip", buf.Bytes())
}

func (h *Handler) ListComplaints(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	list, err := h.svc.ListComplaints(c.Request.Context())
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, list)
}

func (h *Handler) AddComplaint(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	var body map[string]any
	_ = c.ShouldBindJSON(&body)
	out, err := h.svc.AddComplaint(c.Request.Context(), str(body, "email"), str(body, "target"), str(body, "reason"), str(body, "detail"))
	if err != nil {
		if errors.Is(err, errs.ErrInvalidArgument) {
			Fail(c, http.StatusBadRequest, "email/target 无效")
			return
		}
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, out)
}

func (h *Handler) SameIPRank(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "50"))
	items, err := h.svc.SameIPRank(c.Request.Context(), limit)
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, gin.H{"items": items, "appCode": "spark"})
}

func (h *Handler) Ranking(c *gin.Context) {
	OK(c, gin.H{
		"type": c.Param("type"), "date": c.Query("date"),
		"items": []any{},
		"note":  "日排行依赖客户端上报；V3 暂未聚合",
	})
}

func (h *Handler) OpsCatalog(c *gin.Context) {
	OK(c, gin.H{
		"module": "spark-server-admin",
		"im":     []string{"/im/stats", "/im/messages", "/im/conversations"},
		"groups": []string{"/groups", "/groups/{id}", "/groups/{id}/export-zip"},
		"users":  []string{"/users/by-nickname", "/users/by-device", "/users/by-ip"},
	})
}

func (h *Handler) APIDoc(c *gin.Context) {
	OK(c, gin.H{
		"title": "Spark IM V3 Admin API",
		"paths": []gin.H{
			{"method": "GET", "path": "/api/admin/spark/im/stats", "desc": "IM 统计"},
			{"method": "GET", "path": "/api/admin/spark/im/messages", "desc": "消息检索"},
			{"method": "GET", "path": "/api/admin/spark/im/conversations", "desc": "用户会话"},
			{"method": "GET", "path": "/api/admin/spark/groups", "desc": "群列表"},
			{"method": "GET", "path": "/api/admin/spark/groups/{id}", "desc": "群详情"},
			{"method": "DELETE", "path": "/api/admin/spark/groups/{id}", "desc": "解散群"},
			{"method": "GET", "path": "/api/admin/users", "desc": "用户列表（V3）"},
		},
		"aliases": []string{"/api/admin/spark ≡ /api/admin/pop"},
		"auth":    "Bearer admin JWT (type=admin)，与 Java popadmin 登录同密钥",
	})
}

func str(body map[string]any, key string) string {
	if body == nil {
		return ""
	}
	v, ok := body[key]
	if !ok || v == nil {
		return ""
	}
	return strings.TrimSpace(fmt.Sprint(v))
}