package timeoff

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

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

type Handler struct {
	store *Store
}

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

// GET /api/v1/timeoff
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
	}
	requests, err := h.store.List(r.Context(), volunteerID)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not list time off requests")
		return
	}
	if requests == nil {
		requests = []Request{}
	}
	respond.JSON(w, http.StatusOK, requests)
}

// POST /api/v1/timeoff
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 in.StartsAt == "" || in.EndsAt == "" {
		respond.Error(w, http.StatusBadRequest, "starts_at and ends_at are required")
		return
	}
	req, err := h.store.Create(r.Context(), claims.VolunteerID, in)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not create time off request")
		return
	}
	respond.JSON(w, http.StatusCreated, req)
}

// PUT /api/v1/timeoff/{id}/review
func (h *Handler) Review(w http.ResponseWriter, r *http.Request) {
	claims := middleware.ClaimsFromContext(r.Context())
	id, err := strconv.ParseInt(chi.URLParam(r, "id"), 10, 64)
	if err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid id")
		return
	}
	var in ReviewInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if in.Status != "approved" && in.Status != "rejected" {
		respond.Error(w, http.StatusBadRequest, "status must be 'approved' or 'rejected'")
		return
	}
	req, err := h.store.Review(r.Context(), id, claims.VolunteerID, in.Status)
	if errors.Is(err, ErrNotFound) {
		respond.Error(w, http.StatusNotFound, "time off request not found")
		return
	}
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not review time off request")
		return
	}
	respond.JSON(w, http.StatusOK, req)
}