package config

import (
	"runtime"
	"testing"
)

func TestNewReadsPort(t *testing.T) {
	tests := map[string]int{
		"":      defaultPort,
		"1":     1,
		"9090":  9090,
		"65535": 65535,
	}

	for value, want := range tests {
		t.Run(value, func(t *testing.T) {
			t.Setenv("PORT", value)
			t.Setenv("XDG_DATA_HOME", "")

			cfg, err := New()
			if err != nil {
				t.Fatalf("New() with PORT=%q: %v", value, err)
			}

			if cfg.Port != want {
				t.Errorf("New() with PORT=%q: Port = %d, want %d", value, cfg.Port, want)
			}
		})
	}
}

func TestNewRefusesInvalidPort(t *testing.T) {
	for _, value := range []string{"0", "65536", "-1", "http", "80.5"} {
		t.Run(value, func(t *testing.T) {
			t.Setenv("PORT", value)
			t.Setenv("XDG_DATA_HOME", "")

			if _, err := New(); err == nil {
				t.Errorf("New() with PORT=%q returned no error", value)
			}
		})
	}
}

func TestNewRefusesRelativeXDGDataHome(t *testing.T) {
	if runtime.GOOS == "darwin" {
		t.Skip("macOS does not read XDG_DATA_HOME")
	}

	t.Setenv("PORT", "")

	t.Setenv("XDG_DATA_HOME", "relative/path")
	if _, err := New(); err == nil {
		t.Error("New() with a relative XDG_DATA_HOME returned no error")
	}

	t.Setenv("XDG_DATA_HOME", "/var/lib")
	if _, err := New(); err != nil {
		t.Errorf("New() with XDG_DATA_HOME=/var/lib: %v", err)
	}
}