//go:build linux || freebsd

package main

import (
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestItoa(t *testing.T) {
	tests := []struct {
		n    int
		want string
	}{
		{0, "0"},
		{1, "1"},
		{9, "9"},
		{10, "10"},
		{42, "42"},
		{100, "100"},
		{-1, "-1"},
		{-42, "-42"},
		{8080, "8080"},
	}

	for _, tt := range tests {
		t.Run(tt.want, func(t *testing.T) {
			if got := itoa(tt.n); got != tt.want {
				t.Errorf("itoa(%d) = %q, want %q", tt.n, got, tt.want)
			}
		})
	}
}

func TestLast(t *testing.T) {
	tests := []struct {
		s    string
		c    byte
		want int
	}{
		{"hello", 'l', 3},
		{"hello", 'o', 4},
		{"hello", 'h', 0},
		{"hello", 'x', -1},
		{"", 'a', -1},
		{"aaa", 'a', 2},
	}

	for _, tt := range tests {
		if got := last(tt.s, tt.c); got != tt.want {
			t.Errorf("last(%q, %q) = %d, want %d", tt.s, tt.c, got, tt.want)
		}
	}
}

func TestClientIP(t *testing.T) {
	tests := []struct {
		name       string
		remoteAddr string
		want       string
	}{
		{"ipv4 with port", "192.168.1.1:12345", "192.168.1.1"},
		{"ipv6 with brackets", "[::1]:12345", "[::1]"},
		{"ipv4 without port", "192.168.1.1", "192.168.1.1"},
		{"empty", "", ""},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req := httptest.NewRequest(http.MethodGet, "/", nil)
			req.RemoteAddr = tt.remoteAddr
			if got := clientIP(req); got != tt.want {
				t.Errorf("clientIP() = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestStatusRecorder(t *testing.T) {
	rec := httptest.NewRecorder()
	sr := &statusRecorder{ResponseWriter: rec, status: http.StatusOK}

	// Default status before WriteHeader.
	if sr.status != http.StatusOK {
		t.Errorf("initial status = %d, want %d", sr.status, http.StatusOK)
	}

	sr.WriteHeader(http.StatusNotFound)
	if sr.status != http.StatusNotFound {
		t.Errorf("status after WriteHeader = %d, want %d", sr.status, http.StatusNotFound)
	}

	// rec should also have the status set.
	if rec.Code != http.StatusNotFound {
		t.Errorf("rec.Code = %d, want %d", rec.Code, http.StatusNotFound)
	}
}

func TestWithRequestLog(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	logger := slog.New(slog.NewTextHandler(io.Discard, nil))
	wrapped := withRequestLog(handler, logger)
	req := httptest.NewRequest(http.MethodGet, "/test", nil)
	req.RemoteAddr = "192.168.1.1:12345"
	rec := httptest.NewRecorder()

	wrapped.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Errorf("status = %d, want 200", rec.Code)
	}
}