package schedule

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

	"github.com/go-chi/chi/v5"
	"git.unsupervised.ca/walkies/internal/respond"
	"git.unsupervised.ca/walkies/internal/server/middleware"
)

type Handler struct {
	store *Store
}

func NewHandler(store *Store) *Handler {
	return &Handler{store: store}
}

// GET /api/v1/schedules
func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	volunteerID := int64(0)
	if claims.Role != "admin" {
		volunteerID = claims.VolunteerID
	}
	schedules, err := h.store.List(volunteerID)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not list schedules")
		return
	}
	if schedules == nil {
		schedules = []Schedule{}
	}
	respond.JSON(w, http.StatusOK, schedules)
}

// POST /api/v1/schedules
func (h *Handler) Create(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	var in CreateInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if claims.Role != "admin" {
		in.VolunteerID = claims.VolunteerID
	}
	if in.Title == "" || in.StartsAt == "" || in.EndsAt == "" {
		respond.Error(w, http.StatusBadRequest, "title, starts_at, and ends_at are required")
		return
	}
	sc, err := h.store.Create(in)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not create schedule")
		return
	}
	respond.JSON(w, http.StatusCreated, sc)
}

// PUT /api/v1/schedules/{id}
func (h *Handler) Update(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	if err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid id")
		return
	}
	var in UpdateInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid request body")
		return
	}
	sc, err := h.store.Update(id, in)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not update schedule")
		return
	}
	if sc == nil {
		respond.Error(w, http.StatusNotFound, "schedule not found")
		return
	}
	respond.JSON(w, http.StatusOK, sc)
}

// DELETE /api/v1/schedules/{id}
func (h *Handler) Delete(w http.ResponseWriter, r *http.Request) {
	id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	if err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid id")
		return
	}
	if err := h.store.Delete(id); err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not delete schedule")
		return
	}
	w.WriteHeader(http.StatusNoContent)
}