package volunteer

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

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

type Handler struct {
	store   *Store
	authSvc *auth.Service
}

func NewHandler(store *Store, authSvc *auth.Service) *Handler {
	return &Handler{store: store, authSvc: authSvc}
}

// POST /api/v1/auth/register
func (h *Handler) Register(w http.ResponseWriter, r *http.Request) {
	var in CreateInput
	if err := json.NewDecoder(r.Body).Decode(&in); err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid request body")
		return
	}
	if in.Name == "" || in.Email == "" || in.Password == "" {
		respond.Error(w, http.StatusBadRequest, "name, email, and password are required")
		return
	}
	if in.Role == "" {
		in.Role = "volunteer"
	}
	hash, err := auth.HashPassword(in.Password)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not hash password")
		return
	}
	v, err := h.store.Create(r.Context(), in.Name, in.Email, hash, in.Role)
	if err != nil {
		respond.Error(w, http.StatusConflict, "email already in use")
		return
	}
	respond.JSON(w, http.StatusCreated, v)
}

// POST /api/v1/auth/login
func (h *Handler) Login(w http.ResponseWriter, r *http.Request) {
	var body struct {
		Email    string `json:"email"`
		Password string `json:"password"`
	}
	if err := json.NewDecoder(r.Body).Decode(&body); err != nil {
		respond.Error(w, http.StatusBadRequest, "invalid request body")
		return
	}
	token, err := h.authSvc.Login(r.Context(), body.Email, body.Password)
	if err != nil {
		respond.Error(w, http.StatusUnauthorized, "invalid credentials")
		return
	}
	respond.JSON(w, http.StatusOK, map[string]string{"token": token})
}

// GET /api/v1/volunteers
func (h *Handler) List(w http.ResponseWriter, r *http.Request) {
	volunteers, err := h.store.List(r.Context(), true)
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not list volunteers")
		return
	}
	if volunteers == nil {
		volunteers = []Volunteer{}
	}
	respond.JSON(w, http.StatusOK, volunteers)
}

// GET /api/v1/volunteers/{id}
func (h *Handler) Get(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
	}
	v, err := h.store.GetByID(r.Context(), id)
	if errors.Is(err, ErrNotFound) {
		respond.Error(w, http.StatusNotFound, "volunteer not found")
		return
	}
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not get volunteer")
		return
	}
	respond.JSON(w, http.StatusOK, v)
}

// PUT /api/v1/volunteers/{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
	}
	v, err := h.store.Update(r.Context(), id, in)
	if errors.Is(err, ErrNotFound) {
		respond.Error(w, http.StatusNotFound, "volunteer not found")
		return
	}
	if err != nil {
		respond.Error(w, http.StatusInternalServerError, "could not update volunteer")
		return
	}
	respond.JSON(w, http.StatusOK, v)
}