package opencode

import (
	"context"
	"fmt"
	"sync"
)

// 确保 MockClient 实现 OpenCodeClient 接口
var _ OpenCodeClient = (*MockClient)(nil)

// MockClient opencode 客户端的模拟实现
type MockClient struct {
	mu            sync.RWMutex
	sessions      map[string]*Session
	nextSessionID int
	port          int
	baseURL       string
	shouldFail    bool
	failMessage   string
}

// NewMockClient 创建新的模拟客户端
func NewMockClient(port int) *MockClient {
	return &MockClient{
		sessions:      make(map[string]*Session),
		nextSessionID: 1,
		port:          port,
		baseURL:       fmt.Sprintf("http://127.0.0.1:%d", port),
		shouldFail:    false,
	}
}

// SetShouldFail 设置客户端是否应该失败
func (m *MockClient) SetShouldFail(shouldFail bool, message string) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.shouldFail = shouldFail
	m.failMessage = message
}

// CreateSession 模拟创建会话
func (m *MockClient) CreateSession(ctx context.Context, title string) (*Session, error) {
	m.mu.Lock()
	defer m.mu.Unlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	sessionID := fmt.Sprintf("ses-mock-%d", m.nextSessionID)
	m.nextSessionID++

	session := &Session{
		ID:        sessionID,
		Title:     title,
		CreatedAt: "2024-01-01T00:00:00Z",
	}

	m.sessions[sessionID] = session
	return session, nil
}

// SendPrompt 模拟发送消息（同步）
func (m *MockClient) SendPrompt(ctx context.Context, sessionID string, prompt *PromptRequest) (*PromptResponse, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	if _, exists := m.sessions[sessionID]; !exists {
		return nil, fmt.Errorf("会话不存在: %s", sessionID)
	}

	response := &PromptResponse{
		Info: AssistantMessage{
			ID:         "msg-mock-001",
			Role:       "assistant",
			SessionID:  sessionID,
			Content:    "这是模拟的响应：" + prompt.Parts[0].Text,
			Agent:      "opencode",
			ModelID:    "mock-model",
			ProviderID: "mock-provider",
			Tokens: TokenInfo{
				Input:  10,
				Output: 20,
			},
			Time: map[string]interface{}{
				"started":  "2024-01-01T00:00:00Z",
				"finished": "2024-01-01T00:00:01Z",
			},
		},
		Parts: []interface{}{
			map[string]interface{}{
				"type": "text",
				"text": "这是模拟的响应：" + prompt.Parts[0].Text,
			},
		},
	}

	return response, nil
}

// SendPromptStream 模拟发送消息（流式）
func (m *MockClient) SendPromptStream(ctx context.Context, sessionID string, prompt *PromptRequest) (<-chan string, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	if _, exists := m.sessions[sessionID]; !exists {
		return nil, fmt.Errorf("会话不存在: %s", sessionID)
	}

	ch := make(chan string, 10)

	// 模拟流式响应
	go func() {
		defer close(ch)

		messages := []string{
			`{"type": "text", "text": "这是"}`,
			`{"type": "text", "text": "模拟的"}`,
			`{"type": "text", "text": "流式响应。"}`,
			`{"info": {"id": "msg-mock-stream-001", "role": "assistant"}}`,
		}

		for _, msg := range messages {
			select {
			case <-ctx.Done():
				return
			case ch <- msg:
			}
		}
	}()

	return ch, nil
}

// GetSession 模拟获取会话
func (m *MockClient) GetSession(ctx context.Context, sessionID string) (*Session, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	session, exists := m.sessions[sessionID]
	if !exists {
		return nil, fmt.Errorf("会话不存在: %s", sessionID)
	}

	return session, nil
}

// ListSessions 模拟获取会话列表
func (m *MockClient) ListSessions(ctx context.Context) ([]Session, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	sessions := make([]Session, 0, len(m.sessions))
	for _, session := range m.sessions {
		sessions = append(sessions, *session)
	}

	return sessions, nil
}

// GetBaseURL 获取基础URL
func (m *MockClient) GetBaseURL() string {
	return m.baseURL
}

// GetSessionMessages 模拟获取会话消息
func (m *MockClient) GetSessionMessages(ctx context.Context, sessionID string, limit int) ([]SessionMessage, error) {
	m.mu.RLock()
	defer m.mu.RUnlock()

	if m.shouldFail {
		return nil, fmt.Errorf("模拟错误: %s", m.failMessage)
	}

	if _, exists := m.sessions[sessionID]; !exists {
		return nil, fmt.Errorf("会话不存在: %s", sessionID)
	}

	// 创建模拟消息
	messages := []SessionMessage{
		{
			Info: map[string]interface{}{
				"id":        "msg-mock-001",
				"sessionID": sessionID,
				"role":      "user",
				"time": map[string]interface{}{
					"created": float64(1770797040043),
				},
				"agent": "code-sql",
				"model": map[string]interface{}{
					"providerID": "deepseek",
					"modelID":    "deepseek-reasoner",
				},
			},
			Parts: []map[string]interface{}{
				{
					"id":   "prt-mock-001",
					"type": "text",
					"text": "编写查询昨天销售总额的sql代码。简单，用户没有提到的，保持最简单的方式返回内容",
				},
			},
		},
		{
			Info: map[string]interface{}{
				"id":        "msg-mock-002",
				"sessionID": sessionID,
				"role":      "assistant",
				"time": map[string]interface{}{
					"created":   float64(1770797040072),
					"completed": float64(1770797045880),
				},
				"parentID":   "msg-mock-001",
				"modelID":    "deepseek-reasoner",
				"providerID": "deepseek",
				"mode":       "code-sql",
				"agent":      "code-sql",
				"path": map[string]interface{}{
					"cwd":  "/Users/kenqdy/Documents/v-bdx-workspace",
					"root": "/",
				},
				"cost": 0.000514752,
				"tokens": map[string]interface{}{
					"input":     55,
					"output":    114,
					"reasoning": 68,
					"cache": map[string]interface{}{
						"read":  15104,
						"write": 0,
					},
				},
				"finish": "tool-calls",
			},
			Parts: []map[string]interface{}{
				{
					"id":   "prt-mock-002",
					"type": "step-start",
				},
				{
					"id":   "prt-mock-003",
					"type": "reasoning",
					"text": "用户想要查询昨天销售总额的SQL代码...",
				},
			},
		},
	}

	// 如果有限制，截取消息
	if limit > 0 && limit < len(messages) {
		messages = messages[:limit]
	}

	return messages, nil
}

// GetPort 获取端口
func (m *MockClient) GetPort() int {
	return m.port
}