package config

import "testing"

func validConfig() Config {
	return Config{
		Server: ServerConfig{Port: 8080},
		MCP:    MCPConfig{Path: "/mcp"},
		Auth: AuthConfig{
			Keys: []APIKey{{ID: "test", Value: "secret"}},
		},
		Database: DatabaseConfig{URL: "postgres://example"},
		AI: AIConfig{
			Provider: "litellm",
			Embeddings: AIEmbeddingConfig{
				Dimensions: 1536,
			},
			LiteLLM: LiteLLMConfig{
				BaseURL: "http://localhost:4000/v1",
				APIKey:  "key",
			},
			Ollama: OllamaConfig{
				BaseURL: "http://localhost:11434/v1",
				APIKey:  "ollama",
			},
			OpenRouter: OpenRouterAIConfig{
				BaseURL: "https://openrouter.ai/api/v1",
				APIKey:  "key",
			},
		},
		Search:  SearchConfig{DefaultLimit: 10, MaxLimit: 50},
		Logging: LoggingConfig{Level: "info"},
	}
}

func TestValidateAcceptsSupportedProviders(t *testing.T) {
	cfg := validConfig()
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate litellm error = %v", err)
	}

	cfg.AI.Provider = "ollama"
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate ollama error = %v", err)
	}

	cfg.AI.Provider = "openrouter"
	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate openrouter error = %v", err)
	}
}

func TestValidateRejectsInvalidProvider(t *testing.T) {
	cfg := validConfig()
	cfg.AI.Provider = "unknown"

	if err := cfg.Validate(); err == nil {
		t.Fatal("Validate() error = nil, want error for unsupported provider")
	}
}

func TestValidateRejectsEmptyAuthKeyValue(t *testing.T) {
	cfg := validConfig()
	cfg.Auth.Keys[0].Value = ""

	if err := cfg.Validate(); err == nil {
		t.Fatal("Validate() error = nil, want error for empty auth key value")
	}
}

func TestValidateAcceptsOAuthClients(t *testing.T) {
	cfg := validConfig()
	cfg.Auth = AuthConfig{
		OAuth: OAuthConfig{
			Clients: []OAuthClient{{
				ID:           "oauth-client",
				ClientID:     "client-id",
				ClientSecret: "client-secret",
			}},
		},
	}

	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestValidateAcceptsBothAuthMethods(t *testing.T) {
	cfg := validConfig()
	cfg.Auth = AuthConfig{
		Keys: []APIKey{{ID: "key1", Value: "secret"}},
		OAuth: OAuthConfig{
			Clients: []OAuthClient{{
				ID:           "oauth-client",
				ClientID:     "client-id",
				ClientSecret: "client-secret",
			}},
		},
	}

	if err := cfg.Validate(); err != nil {
		t.Fatalf("Validate() error = %v", err)
	}
}

func TestValidateRejectsEmptyAuth(t *testing.T) {
	cfg := validConfig()
	cfg.Auth = AuthConfig{}

	if err := cfg.Validate(); err == nil {
		t.Fatal("Validate() error = nil, want error when neither auth.keys nor auth.oauth.clients is configured")
	}
}

func TestValidateRejectsInvalidMetadataRetryConfig(t *testing.T) {
	cfg := validConfig()
	cfg.MetadataRetry.Enabled = true
	cfg.MetadataRetry.MaxPerRun = 0

	if err := cfg.Validate(); err == nil {
		t.Fatal("Validate() error = nil, want error for invalid metadata retry config")
	}
}