// SPDX-FileCopyrightText: Copyright The Miniflux Authors. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

package fever // import "miniflux.app/v2/internal/fever"

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

	"miniflux.app/v2/internal/http/request"
	"miniflux.app/v2/internal/http/response"
	"miniflux.app/v2/internal/storage"
)

// Middleware returns the Fever authentication middleware.
func Middleware(store *storage.Storage) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			clientIP := request.ClientIP(r)
			apiKey := r.FormValue("api_key")
			if apiKey == "" {
				slog.Warn("[Fever] No API key provided",
					slog.Bool("authentication_failed", true),
					slog.String("client_ip", clientIP),
					slog.String("user_agent", r.UserAgent()),
				)
				response.JSON(w, r, newAuthFailureResponse())
				return
			}

			user, err := store.UserByFeverToken(apiKey)
			if err != nil {
				slog.Error("[Fever] Unable to fetch user by API key",
					slog.Bool("authentication_failed", true),
					slog.String("client_ip", clientIP),
					slog.String("user_agent", r.UserAgent()),
					slog.Any("error", err),
				)
				response.JSON(w, r, newAuthFailureResponse())
				return
			}

			if user == nil {
				slog.Warn("[Fever] No user found with the API key provided",
					slog.Bool("authentication_failed", true),
					slog.String("client_ip", clientIP),
					slog.String("user_agent", r.UserAgent()),
				)
				response.JSON(w, r, newAuthFailureResponse())
				return
			}

			slog.Info("[Fever] User authenticated successfully",
				slog.Bool("authentication_successful", true),
				slog.String("client_ip", clientIP),
				slog.String("user_agent", r.UserAgent()),
				slog.Int64("user_id", user.ID),
				slog.String("username", user.Username),
			)

			store.SetLastLogin(user.ID)

			ctx := r.Context()
			ctx = context.WithValue(ctx, request.UserIDContextKey, user.ID)
			ctx = context.WithValue(ctx, request.UserTimezoneContextKey, user.Timezone)
			ctx = context.WithValue(ctx, request.IsAdminUserContextKey, user.IsAdmin)
			ctx = context.WithValue(ctx, request.IsAuthenticatedContextKey, true)

			next.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}
