package config

import (
	"os"
	"path/filepath"
	"testing"
)

func TestLoad(t *testing.T) {
	// Create a temporary test config file
	testConfig := `
database:
  driver: postgres
  dsn: postgres://user:pass@localhost:5432/db
server:
  port: 8080
  host: localhost
jwt:
  secret: test-secret
  expiration: 24h
logging:
  level: debug
  format: console
`
	tmpDir := t.TempDir()
	configPath := filepath.Join(tmpDir, "config.yaml")
	if err := os.WriteFile(configPath, []byte(testConfig), 0644); err != nil {
		t.Fatalf("Failed to create test config file: %v", err)
	}

	// Test successful config loading
	cfg, err := Load(configPath)
	if err != nil {
		t.Fatalf("Failed to load config: %v", err)
	}

	// Verify loaded values
	tests := []struct {
		name     string
		got      interface{}
		expected interface{}
	}{
		{"database.driver", cfg.Database.Driver, "postgres"},
		{"database.dsn", cfg.Database.DSN, "postgres://user:pass@localhost:5432/db"},
		{"server.port", cfg.Server.Port, 8080},
		{"server.host", cfg.Server.Host, "localhost"},
		{"jwt.secret", cfg.JWT.Secret, "test-secret"},
		{"jwt.expiration", cfg.JWT.Expiration, "24h"},
		{"logging.level", cfg.Logging.Level, "debug"},
		{"logging.format", cfg.Logging.Format, "console"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if tt.got != tt.expected {
				t.Errorf("Config %s = %v, want %v", tt.name, tt.got, tt.expected)
			}
		})
	}

	// Test loading non-existent file
	_, err = Load("non-existent.yaml")
	if err == nil {
		t.Error("Expected error when loading non-existent file, got nil")
	}

	// Test loading invalid YAML
	invalidPath := filepath.Join(tmpDir, "invalid.yaml")
	if err := os.WriteFile(invalidPath, []byte("invalid: yaml: content"), 0644); err != nil {
		t.Fatalf("Failed to create invalid config file: %v", err)
	}

	_, err = Load(invalidPath)
	if err == nil {
		t.Error("Expected error when loading invalid YAML, got nil")
	}
}