package api

import (
	"log/slog"
	"net/http"
	"runtime/debug"
	"time"
)

// logging is an HTTP middleware that logs every request with method, path,
// status code, and duration.
func logging(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		start := time.Now()
		wrapped := &statusRecorder{ResponseWriter: w, status: http.StatusOK}

		next.ServeHTTP(wrapped, r)

		slog.Info("http request",
			"method", r.Method,
			"path", r.URL.Path,
			"status", wrapped.status,
			"duration", time.Since(start).String(),
		)
	})
}

// recovery is an HTTP middleware that catches panics and returns a 500 response.
func recovery(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer func() {
			if err := recover(); err != nil {
				slog.Error("panic recovered", "error", err, "stack", string(debug.Stack()))
				respondError(w, http.StatusInternalServerError, "internal server error")
			}
		}()
		next.ServeHTTP(w, r)
	})
}

// cors is an HTTP middleware that sets permissive CORS headers for development.
func cors(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Access-Control-Allow-Origin", "*")
		w.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
		w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")

		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusNoContent)
			return
		}

		next.ServeHTTP(w, r)
	})
}

// jsonContentType is an HTTP middleware that sets the default Content-Type to JSON.
func jsonContentType(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		next.ServeHTTP(w, r)
	})
}

// statusRecorder wraps http.ResponseWriter to capture the status code.
type statusRecorder struct {
	http.ResponseWriter
	status int
}

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