package api

import (
	"log/slog"
	"net/http"

	"github.com/jacek/pamietnik/backend/internal/db"
	"github.com/jacek/pamietnik/backend/internal/domain"
)

// HandleListDays handles GET /v1/days?from=YYYY-MM-DD&to=YYYY-MM-DD
func HandleListDays(store *db.TrackpointStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID := userIDFromContext(r.Context())
		from := r.URL.Query().Get("from")
		to := r.URL.Query().Get("to")
		if from == "" || to == "" {
			writeError(w, http.StatusBadRequest, "BAD_REQUEST", "from and to are required (YYYY-MM-DD)")
			return
		}

		days, err := store.ListDays(r.Context(), userID, from, to)
		if err != nil {
			slog.Error("list days", "user_id", userID, "err", err)
			writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "database error")
			return
		}
		if days == nil {
			days = []domain.DaySummary{}
		}
		writeJSON(w, http.StatusOK, days)
	}
}

// HandleListTrackpoints handles GET /v1/trackpoints?date=YYYY-MM-DD
func HandleListTrackpoints(store *db.TrackpointStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID := userIDFromContext(r.Context())
		date := r.URL.Query().Get("date")
		if date == "" {
			writeError(w, http.StatusBadRequest, "BAD_REQUEST", "date is required (YYYY-MM-DD)")
			return
		}

		points, err := store.ListByDate(r.Context(), userID, date)
		if err != nil {
			slog.Error("list trackpoints", "user_id", userID, "date", date, "err", err)
			writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "database error")
			return
		}
		if points == nil {
			points = []domain.Trackpoint{}
		}
		writeJSON(w, http.StatusOK, points)
	}
}

// HandleListStops handles GET /v1/stops?date=YYYY-MM-DD
func HandleListStops(store *db.StopStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID := userIDFromContext(r.Context())
		date := r.URL.Query().Get("date")
		if date == "" {
			writeError(w, http.StatusBadRequest, "BAD_REQUEST", "date is required (YYYY-MM-DD)")
			return
		}

		stops, err := store.ListByDate(r.Context(), userID, date)
		if err != nil {
			slog.Error("list stops", "user_id", userID, "date", date, "err", err)
			writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "database error")
			return
		}
		if stops == nil {
			stops = []domain.Stop{}
		}
		writeJSON(w, http.StatusOK, stops)
	}
}

// HandleListSuggestions handles GET /v1/suggestions?date=YYYY-MM-DD
func HandleListSuggestions(store *db.SuggestionStore) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		userID := userIDFromContext(r.Context())
		date := r.URL.Query().Get("date")
		if date == "" {
			writeError(w, http.StatusBadRequest, "BAD_REQUEST", "date is required (YYYY-MM-DD)")
			return
		}

		suggestions, err := store.ListByDate(r.Context(), userID, date)
		if err != nil {
			slog.Error("list suggestions", "user_id", userID, "date", date, "err", err)
			writeError(w, http.StatusInternalServerError, "INTERNAL_ERROR", "database error")
			return
		}
		if suggestions == nil {
			suggestions = []domain.Suggestion{}
		}
		writeJSON(w, http.StatusOK, suggestions)
	}
}