package api

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

	"github.com/mjensen/weimar/internal/auth"
	"github.com/mjensen/weimar/internal/config"
	"github.com/mjensen/weimar/internal/db"
	"github.com/mjensen/weimar/internal/storage"
)

type ctxKey string

const CtxKeyUser ctxKey = "user"

// UserFromContext extracts the authenticated user from the request context.
func UserFromContext(ctx context.Context) *db.User {
	user, _ := ctx.Value(CtxKeyUser).(*db.User)
	return user
}

// API holds dependencies shared by all HTTP handlers.
type API struct {
	DB      *db.DB
	Auth    *auth.SessionManager
	Storage *storage.Storage
	Cfg     *config.Config
}

func New(database *db.DB, sm *auth.SessionManager, st *storage.Storage, cfg *config.Config) *API {
	return &API{
		DB:      database,
		Auth:    sm,
		Storage: st,
		Cfg:     cfg,
	}
}

func writeJSON(w http.ResponseWriter, status int, v any) {
	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(status)
	json.NewEncoder(w).Encode(v)
}

func writeError(w http.ResponseWriter, status int, msg string) {
	writeJSON(w, status, map[string]string{"error": msg})
}