package handler

import (
	"net/http"

	"github.com/company/ai-ops/internal/domain/model"
	"github.com/company/ai-ops/internal/service"
	"github.com/company/ai-ops/pkg/errors"
	"github.com/company/ai-ops/pkg/response"
)

// ChannelHandler 是通知渠道 HTTP 处理器
type ChannelHandler struct {
	service *service.ChannelService
}

func NewChannelHandler(s *service.ChannelService) *ChannelHandler {
	return &ChannelHandler{service: s}
}

func (h *ChannelHandler) RegisterRoutes(mux *http.ServeMux) {
	mux.HandleFunc("GET /api/v1/ai-ops/channels", h.ListChannels)
	mux.HandleFunc("GET /api/v1/ai-ops/channels/{id}", h.GetChannel)
	mux.HandleFunc("POST /api/v1/ai-ops/channels", h.CreateChannel)
	mux.HandleFunc("PUT /api/v1/ai-ops/channels/{id}", h.UpdateChannel)
	mux.HandleFunc("DELETE /api/v1/ai-ops/channels/{id}", h.DeleteChannel)
	mux.HandleFunc("POST /api/v1/ai-ops/channels/test", h.TestChannel)
}

func (h *ChannelHandler) ListChannels(w http.ResponseWriter, r *http.Request) {
	channels, err := h.service.List(r.Context())
	if err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrInternal))
		return
	}
	response.Success(w, channels)
}

func (h *ChannelHandler) GetChannel(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	ch, err := h.service.Get(r.Context(), id)
	if err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrNotFound))
		return
	}
	response.Success(w, ch)
}

func (h *ChannelHandler) CreateChannel(w http.ResponseWriter, r *http.Request) {
	var ch model.NotificationChannel
	if err := decodeJSON(r, &ch); err != nil {
		response.Error(w, errors.ErrBadRequest.WithDetail(map[string]any{"error": err.Error()}))
		return
	}
	if err := h.service.Create(r.Context(), &ch); err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrBadRequest))
		return
	}
	w.WriteHeader(http.StatusCreated)
	response.Success(w, ch)
}

func (h *ChannelHandler) UpdateChannel(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	var ch model.NotificationChannel
	if err := decodeJSON(r, &ch); err != nil {
		response.Error(w, errors.ErrBadRequest.WithDetail(map[string]any{"error": err.Error()}))
		return
	}
	ch.ID = id
	if err := h.service.Update(r.Context(), &ch); err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrBadRequest))
		return
	}
	response.Success(w, ch)
}

func (h *ChannelHandler) DeleteChannel(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := h.service.Delete(r.Context(), id); err != nil {
		response.Error(w, errors.Wrap(err, errors.ErrInternal))
		return
	}
	w.WriteHeader(http.StatusNoContent)
}

func (h *ChannelHandler) TestChannel(w http.ResponseWriter, r *http.Request) {
	var req struct {
		ChannelID string `json:"channel_id"`
		Message   string `json:"message"`
	}
	if err := decodeJSON(r, &req); err != nil {
		response.Error(w, errors.ErrBadRequest.WithDetail(map[string]any{"error": err.Error()}))
		return
	}
	response.Success(w, map[string]any{"ok": true})
}