package web

import (
	"encoding/csv"
	"encoding/json"
	"errors"
	"net/http"
	"strconv"
	"strings"

	"ymhut-box/server/unified-management/internal/db"
)

func (r *router) handleAdminFeedbacks(w http.ResponseWriter, req *http.Request) {
	path := cleanPath(req.URL.Path)
	if req.Method == http.MethodGet && path == "/api/admin/feedbacks" {
		if req.URL.Query().Get("page") != "" {
			page, _ := strconv.Atoi(req.URL.Query().Get("page"))
			perPage, _ := strconv.Atoi(req.URL.Query().Get("perPage"))
			items, total, err := r.store.ListFeedbacksFiltered(page, perPage, db.FeedbackFilters{
				Status:   req.URL.Query().Get("status"),
				Category: req.URL.Query().Get("category"),
				Priority: req.URL.Query().Get("priority"),
				Query:    req.URL.Query().Get("q"),
				Assignee: req.URL.Query().Get("assignee"),
				Sort:     req.URL.Query().Get("sort"),
			})
			if err != nil {
				writeError(w, http.StatusInternalServerError, "FEEDBACK_LIST_FAILED", err)
				return
			}
			if page <= 0 {
				page = 1
			}
			if perPage <= 0 {
				perPage = 20
			}
			writeJSON(w, http.StatusOK, map[string]any{"ok": true, "page": map[string]any{"items": items, "total": total, "page": page, "perPage": perPage}})
			return
		}
		limit, _ := strconv.Atoi(req.URL.Query().Get("limit"))
		items, err := r.store.ListFeedbacks(limit)
		if err != nil {
			writeError(w, http.StatusInternalServerError, "FEEDBACK_LIST_FAILED", err)
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"ok": true, "items": items})
		return
	}
	if req.Method == http.MethodGet && path == "/api/admin/feedbacks/export" {
		items, _, err := r.store.ListFeedbacksFiltered(1, 100, db.FeedbackFilters{
			Status:   req.URL.Query().Get("status"),
			Category: req.URL.Query().Get("category"),
			Priority: req.URL.Query().Get("priority"),
			Query:    req.URL.Query().Get("q"),
		})
		if err != nil {
			writeError(w, http.StatusInternalServerError, "EXPORT_FAILED", err)
			return
		}
		w.Header().Set("Content-Type", "text/csv; charset=utf-8")
		w.Header().Set("Content-Disposition", `attachment; filename="feedbacks.csv"`)
		writer := csv.NewWriter(w)
		_ = writer.Write([]string{"code", "created_at", "title", "status", "category", "priority", "contact", "status_detail", "public_reply"})
		for _, item := range items {
			_ = writer.Write([]string{item.Code, item.CreatedAt, item.Title, item.Status, item.Category, item.Priority, item.Contact, item.StatusDetail, item.PublicReply})
		}
		writer.Flush()
		return
	}
	if req.Method == http.MethodGet && strings.HasPrefix(path, "/api/admin/feedbacks/") {
		code := strings.TrimPrefix(path, "/api/admin/feedbacks/")
		detail, err := r.store.GetFeedbackDetail(code)
		if err != nil {
			writeError(w, http.StatusNotFound, "NOT_FOUND", err)
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"ok": true, "feedback": detail})
		return
	}
	if req.Method == http.MethodPatch && path == "/api/admin/feedbacks/bulk" {
		var body struct {
			Codes        []string `json:"codes"`
			Status       string   `json:"status"`
			StatusDetail string   `json:"statusDetail"`
			PublicReply  string   `json:"publicReply"`
			Assignee     string   `json:"assignee"`
			Tags         []string `json:"tags"`
		}
		if err := json.NewDecoder(req.Body).Decode(&body); err != nil || len(body.Codes) == 0 {
			writeError(w, http.StatusBadRequest, "INVALID_PAYLOAD", errors.New("codes are required"))
			return
		}
		if err := r.store.BulkUpdateFeedback(body.Codes, db.FeedbackUpdate{Status: body.Status, StatusDetail: body.StatusDetail, PublicReply: body.PublicReply, Assignee: body.Assignee, Actor: "admin", Tags: body.Tags}); err != nil {
			writeError(w, http.StatusInternalServerError, "BULK_UPDATE_FAILED", err)
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"ok": true, "updated": len(body.Codes)})
		return
	}
	if req.Method == http.MethodPost && strings.HasPrefix(path, "/api/admin/feedbacks/") && strings.HasSuffix(path, "/comments") {
		code := strings.TrimSuffix(strings.TrimPrefix(path, "/api/admin/feedbacks/"), "/comments")
		var body struct {
			Author   string `json:"author"`
			Body     string `json:"body"`
			Internal bool   `json:"internal"`
		}
		if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
			writeError(w, http.StatusBadRequest, "INVALID_PAYLOAD", err)
			return
		}
		comment, err := r.store.InsertFeedbackComment(db.FeedbackComment{Code: code, Author: firstNonEmpty(body.Author, "admin"), Body: body.Body, Internal: body.Internal})
		if err != nil {
			writeError(w, http.StatusInternalServerError, "COMMENT_FAILED", err)
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"ok": true, "comment": comment})
		return
	}
	if req.Method == http.MethodPatch && strings.HasPrefix(path, "/api/admin/feedbacks/") {
		code := strings.TrimPrefix(path, "/api/admin/feedbacks/")
		var body struct {
			Status       string `json:"status"`
			StatusDetail string `json:"statusDetail"`
			PublicReply  string `json:"publicReply"`
		}
		if err := json.NewDecoder(req.Body).Decode(&body); err != nil {
			writeError(w, http.StatusBadRequest, "INVALID_PAYLOAD", err)
			return
		}
		if err := r.store.UpdateFeedbackTicket(code, db.FeedbackUpdate{Status: firstNonEmpty(body.Status, "new"), StatusDetail: body.StatusDetail, PublicReply: body.PublicReply, Actor: "admin"}); err != nil {
			writeError(w, http.StatusInternalServerError, "FEEDBACK_UPDATE_FAILED", err)
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"ok": true})
		return
	}
	http.NotFound(w, req)
}