package reward

import (
	"encoding/json"
	"net/http"

	"github.com/wangjia/pangolin/server/internal/apierr"
	"github.com/wangjia/pangolin/server/internal/auth"
)

const inviteLinkBase = "https://pangolin.yanmeiai.com/i/"

type Handler struct {
	svc       *Service
	st        *Store
	tgEnabled bool
	channel   string
}

func NewHandler(s *Service, st *Store, tgEnabled bool, channel string) *Handler {
	return &Handler{svc: s, st: st, tgEnabled: tgEnabled, channel: channel}
}

func (h *Handler) GetInvite(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	uid, ok := auth.UserIDFromContext(ctx)
	if !ok {
		apierr.WriteJSON(w, http.StatusUnauthorized, apierr.ErrUnauthorized)
		return
	}
	code, err := h.svc.EnsureCode(ctx, uid)
	if err != nil {
		apierr.WriteJSON(w, http.StatusInternalServerError, apierr.ErrInternal)
		return
	}
	invited, converted, earned, err := h.st.Summary(ctx, uid)
	if err != nil {
		apierr.WriteJSON(w, http.StatusInternalServerError, apierr.ErrInternal)
		return
	}
	joined, _ := h.st.TelegramClaimed(ctx, uid)
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	_ = json.NewEncoder(w).Encode(map[string]any{
		"invite_code": code,
		"invite_link": inviteLinkBase + code,
		"invited":     invited,
		"converted":   converted,
		"earned_days": earned,
		"telegram": map[string]any{
			"enabled": h.tgEnabled,
			"joined":  joined,
			"channel": h.channel,
		},
	})
}

func (h *Handler) TelegramStart(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	uid, ok := auth.UserIDFromContext(ctx)
	if !ok {
		apierr.WriteJSON(w, http.StatusUnauthorized, apierr.ErrUnauthorized)
		return
	}
	if !h.tgEnabled {
		apierr.WriteJSON(w, http.StatusNotFound, apierr.ErrNotFound)
		return
	}
	tok, err := h.svc.IssueTelegramToken(ctx, uid)
	if err != nil {
		apierr.WriteJSON(w, http.StatusInternalServerError, apierr.ErrInternal)
		return
	}
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	_ = json.NewEncoder(w).Encode(map[string]any{"deep_link": h.svc.TelegramDeepLink(tok)})
}