package config

import (
	"os"
	"testing"
	"time"
)

func TestLoad(t *testing.T) {
	// Set test environment variables
	os.Setenv("GITHUB_TOKEN", "test-token")
	os.Setenv("GITHUB_OWNER", "test-owner")
	os.Setenv("GITHUB_REPO", "test-repo")
	os.Setenv("PORT", "9090")
	os.Setenv("CACHE_DURATION", "30m")
	os.Setenv("UPDATE_INTERVAL", "10m")
	os.Setenv("DEFAULT_THEME", "dark")
	os.Setenv("BASE_URL", "https://example.com")

	cfg, err := Load()
	if err != nil {
		t.Fatalf("Expected no error, got %v", err)
	}

	if cfg.GitHubToken != "test-token" {
		t.Errorf("Expected GitHubToken to be 'test-token', got %s", cfg.GitHubToken)
	}

	if cfg.Port != "9090" {
		t.Errorf("Expected Port to be '9090', got %s", cfg.Port)
	}

	if cfg.CacheDuration != 30*time.Minute {
		t.Errorf("Expected CacheDuration to be 30m, got %v", cfg.CacheDuration)
	}

	if cfg.Theme != "dark" {
		t.Errorf("Expected Theme to be 'dark', got %s", cfg.Theme)
	}

	if cfg.BaseURL != "https://example.com" {
		t.Errorf("Expected BaseURL to be 'https://example.com', got %s", cfg.BaseURL)
	}
}

func TestLoadMissingRequiredVars(t *testing.T) {
	// Clear environment variables
	os.Unsetenv("GITHUB_TOKEN")
	os.Unsetenv("GITHUB_OWNER")
	os.Unsetenv("GITHUB_REPO")

	_, err := Load()
	if err == nil {
		t.Fatal("Expected error for missing required variables")
	}
}

func TestGetEnv(t *testing.T) {
	os.Setenv("TEST_VAR", "test-value")
	defer os.Unsetenv("TEST_VAR")

	if got := getEnv("TEST_VAR", "default"); got != "test-value" {
		t.Errorf("Expected 'test-value', got %s", got)
	}

	if got := getEnv("NONEXISTENT_VAR", "default"); got != "default" {
		t.Errorf("Expected 'default', got %s", got)
	}
}

func TestGetDurationEnv(t *testing.T) {
	os.Setenv("TEST_DURATION", "5m")
	defer os.Unsetenv("TEST_DURATION")

	if got := getDurationEnv("TEST_DURATION", 1*time.Minute); got != 5*time.Minute {
		t.Errorf("Expected 5m, got %v", got)
	}

	if got := getDurationEnv("INVALID_DURATION", 1*time.Minute); got != 1*time.Minute {
		t.Errorf("Expected 1m, got %v", got)
	}
}