package main

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

	"git.loyso.art/frx/kurious/assets/kurious"
	"git.loyso.art/frx/kurious/internal/common/config"
	"git.loyso.art/frx/kurious/internal/common/generator"
	"git.loyso.art/frx/kurious/internal/common/xcontext"
	xhttp "git.loyso.art/frx/kurious/internal/kurious/ports/http"
	"github.com/gorilla/mux"
)

func setupHTTP(cfg config.HTTP, srv xhttp.Server, log *slog.Logger) *http.Server {
	router := mux.NewRouter()

	coursesAPI := srv.Courses()

	router.Use(mux.CORSMethodMiddleware(router))
	router.Use(middlewareLogger(log))
	router.HandleFunc("/updatedesc", coursesAPI.UdpateDescription).Methods(http.MethodPost)
	coursesRouter := router.PathPrefix("/courses").Subrouter()
	coursesRouter.HandleFunc("/", coursesAPI.List).Methods(http.MethodGet)

	courseRouter := coursesRouter.PathPrefix("/{course_id}").Subrouter()
	courseRouter.HandleFunc("/", coursesAPI.Get).Methods(http.MethodGet)
	courseRouter.HandleFunc("/short", coursesAPI.GetShort).Methods(http.MethodGet)
	courseRouter.HandleFunc("/editdesc", coursesAPI.RenderEditDescription).Methods(http.MethodGet)
	courseRouter.HandleFunc("/description", coursesAPI.UpdateCourseDescription).Methods(http.MethodPut)

	if cfg.MountLive {
		fs := http.FileServer(http.Dir("./assets/kurious/static/"))
		router.PathPrefix("/static/").Handler(http.StripPrefix("/static/", fs)).Methods(http.MethodGet)

		router.HandleFunc("/robots.txt", func(w http.ResponseWriter, r *http.Request) {
			http.ServeFile(w, r, "./assets/kurious/robots.txt")
		}).Methods(http.MethodGet)
	} else {
		fs := kurious.AsHTTPFileHandler()
		router.PathPrefix("/").Handler(fs).Methods(http.MethodGet)
	}

	return &http.Server{
		Addr:    cfg.ListenAddr,
		Handler: router,
	}
}

func middlewareLogger(log *slog.Logger) mux.MiddlewareFunc {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			ctx := r.Context()
			requestID := r.Header.Get("x-request-id")
			if requestID == "" {
				requestID = generator.RandomInt64ID()
			}
			ctx = xcontext.WithLogFields(ctx, slog.String("request_id", requestID))

			xcontext.LogInfo(
				ctx, log, "incoming request",
				slog.String("method", r.Method),
				slog.String("path", r.URL.Path),
			)

			start := time.Now()
			next.ServeHTTP(w, r.WithContext(ctx))
			elapsed := time.Since(start).Truncate(time.Millisecond)

			xcontext.LogInfo(
				ctx, log, "request processed",
				slog.Duration("elapsed", elapsed),
			)
		})
	}
}