// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright (C) 2026 Bryan Joshua Pedini

package main

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

// NewLogger builds the process-wide structured logger, text output to
// stdout, level driven by LOG_LEVEL.
func NewLogger(level string) *slog.Logger {
	var lvl slog.Level
	switch level {
	case "debug":
		lvl = slog.LevelDebug
	case "warn":
		lvl = slog.LevelWarn
	case "error":
		lvl = slog.LevelError
	default:
		lvl = slog.LevelInfo
	}

	handler := slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{Level: lvl})
	return slog.New(handler)
}

// statusRecorder captures the status code written by downstream handlers so
// the logging middleware can report it.
type statusRecorder struct {
	http.ResponseWriter
	status int
}

func (r *statusRecorder) WriteHeader(status int) {
	r.status = status
	r.ResponseWriter.WriteHeader(status)
}

// loggingMiddleware logs method, path, status, and duration at info level
// for every request.
func (s *WebServer) loggingMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		rec := &statusRecorder{ResponseWriter: w, status: http.StatusOK}

		next.ServeHTTP(rec, r)

		s.Logger.Info("request",
			"method", r.Method,
			"path", r.URL.Path,
			"status", rec.status,
			"duration", time.Since(start),
		)
	})
}