package agent

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

	"github.com/sipeed/picoclaw/pkg/bus"
	"github.com/sipeed/picoclaw/pkg/config"
	"github.com/sipeed/picoclaw/pkg/providers"
)

// mockProvider is a simple mock LLM provider for testing
type mockProvider struct{}

func (m *mockProvider) Chat(ctx context.Context, messages []providers.Message, tools []providers.ToolDefinition, model string, opts map[string]interface{}) (*providers.LLMResponse, error) {
	return &providers.LLMResponse{
		Content:  "Mock response",
		ToolCalls: []providers.ToolCall{},
	}, nil
}

func (m *mockProvider) GetDefaultModel() string {
	return "mock-model"
}

func TestRecordLastChannel(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Test RecordLastChannel
	testChannel := "test-channel"
	err = al.RecordLastChannel(testChannel)
	if err != nil {
		t.Fatalf("RecordLastChannel failed: %v", err)
	}

	// Verify the channel was saved
	lastChannel := al.state.GetLastChannel()
	if lastChannel != testChannel {
		t.Errorf("Expected channel '%s', got '%s'", testChannel, lastChannel)
	}

	// Verify persistence by creating a new agent loop
	al2 := NewAgentLoop(cfg, msgBus, provider)
	if al2.state.GetLastChannel() != testChannel {
		t.Errorf("Expected persistent channel '%s', got '%s'", testChannel, al2.state.GetLastChannel())
	}
}

func TestRecordLastChatID(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Test RecordLastChatID
	testChatID := "test-chat-id-123"
	err = al.RecordLastChatID(testChatID)
	if err != nil {
		t.Fatalf("RecordLastChatID failed: %v", err)
	}

	// Verify the chat ID was saved
	lastChatID := al.state.GetLastChatID()
	if lastChatID != testChatID {
		t.Errorf("Expected chat ID '%s', got '%s'", testChatID, lastChatID)
	}

	// Verify persistence by creating a new agent loop
	al2 := NewAgentLoop(cfg, msgBus, provider)
	if al2.state.GetLastChatID() != testChatID {
		t.Errorf("Expected persistent chat ID '%s', got '%s'", testChatID, al2.state.GetLastChatID())
	}
}

func TestNewAgentLoop_StateInitialized(t *testing.T) {
	// Create temp workspace
	tmpDir, err := os.MkdirTemp("", "agent-test-*")
	if err != nil {
		t.Fatalf("Failed to create temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	// Create test config
	cfg := &config.Config{
		Agents: config.AgentsConfig{
			Defaults: config.AgentDefaults{
				Workspace:         tmpDir,
				Model:             "test-model",
				MaxTokens:         4096,
				MaxToolIterations: 10,
			},
		},
	}

	// Create agent loop
	msgBus := bus.NewMessageBus()
	provider := &mockProvider{}
	al := NewAgentLoop(cfg, msgBus, provider)

	// Verify state manager is initialized
	if al.state == nil {
		t.Error("Expected state manager to be initialized")
	}

	// Verify state directory was created
	stateDir := filepath.Join(tmpDir, "state")
	if _, err := os.Stat(stateDir); os.IsNotExist(err) {
		t.Error("Expected state directory to exist")
	}
}