package config

import (
	"os"
	"testing"
)

func TestLoad_Defaults(t *testing.T) {
	// Clear env to test defaults
	envKeys := []string{"DATABASE_URL", "JWT_SECRET", "PORT", "RESEND_API_KEY", "FROM_EMAIL", "FROM_NAME", "APP_URL", "TELEGRAM_BOT_TOKEN"}
	originals := make(map[string]string)
	for _, k := range envKeys {
		originals[k] = os.Getenv(k)
		os.Unsetenv(k)
	}
	defer func() {
		for k, v := range originals {
			if v != "" {
				os.Setenv(k, v)
			}
		}
	}()

	cfg := Load()

	if cfg.Port != "8080" {
		t.Errorf("expected default port 8080, got %s", cfg.Port)
	}
	if cfg.JWTSecret != "change-me-in-production" {
		t.Errorf("expected default JWT secret, got %s", cfg.JWTSecret)
	}
	if cfg.FromEmail != "noreply@digital-home.site" {
		t.Errorf("expected default from email, got %s", cfg.FromEmail)
	}
}

func TestLoad_FromEnv(t *testing.T) {
	os.Setenv("PORT", "9090")
	os.Setenv("JWT_SECRET", "my-secret")
	defer func() {
		os.Unsetenv("PORT")
		os.Unsetenv("JWT_SECRET")
	}()

	cfg := Load()

	if cfg.Port != "9090" {
		t.Errorf("expected port 9090, got %s", cfg.Port)
	}
	if cfg.JWTSecret != "my-secret" {
		t.Errorf("expected JWT secret my-secret, got %s", cfg.JWTSecret)
	}
}

func TestGetEnv(t *testing.T) {
	tests := []struct {
		name     string
		key      string
		envValue string
		def      string
		want     string
	}{
		{"returns env value", "TEST_KEY_1", "env_val", "default", "env_val"},
		{"returns default when empty", "TEST_KEY_2", "", "default", "default"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.envValue != "" {
				os.Setenv(tt.key, tt.envValue)
				defer os.Unsetenv(tt.key)
			}
			got := getEnv(tt.key, tt.def)
			if got != tt.want {
				t.Errorf("getEnv(%s) = %s, want %s", tt.key, got, tt.want)
			}
		})
	}
}