import type { User, UserCreate, Project, ProjectCreate, ProjectsResponse, ProjectAvailability, Task, TaskCreate, TasksResponse, MembersResponse, ActivityResponse } from '../types';

const API_BASE = 'http://localhost:8000/api';

class ApiClient {
  private async request<T>(endpoint: string, options?: RequestInit): Promise<T> {
    const response = await fetch(`${API_BASE}${endpoint}`, {
      headers: {
        'Content-Type': 'application/json',
        ...options?.headers,
      },
      ...options,
    });

    if (!response.ok) {
      const error = await response.json().catch(() => ({ error: 'Request failed' }));
      throw new Error(error.error || error.detail || 'Request failed');
    }

    return response.json();
  }

  // User endpoints
  async createUser(data: UserCreate): Promise<User> {
    return this.request<User>('/users', {
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async getUser(userId: string): Promise<User> {
    return this.request<User>(`/users/${userId}`);
  }

  async listUsers(): Promise<User[]> {
    return this.request<User[]>('/users');
  }

  // Project endpoints
  async checkProjectAvailability(projectId: string): Promise<ProjectAvailability> {
    return this.request<ProjectAvailability>(`/projects/check/${projectId}`);
  }

  async listProjects(userId: string): Promise<ProjectsResponse> {
    return this.request<ProjectsResponse>(`/projects?userId=${userId}`);
  }

  async createProject(data: ProjectCreate): Promise<Project> {
    return this.request<Project>('/projects', {
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async joinProject(projectId: string, userId: string): Promise<{ message: string; project_id: string; role: string }> {
    return this.request(`/projects/${projectId}/join`, {
      method: 'POST',
      body: JSON.stringify({ userId }),
    });
  }

  // Task endpoints
  async listTasks(projectId: string, status?: string): Promise<TasksResponse> {
    const query = status ? `?status=${status}` : '';
    return this.request<TasksResponse>(`/projects/${projectId}/tasks${query}`);
  }

  async createTask(projectId: string, data: TaskCreate): Promise<Task> {
    return this.request<Task>(`/projects/${projectId}/tasks`, {
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async generateTasks(projectId: string, count = 50): Promise<{ tasks: { title: string; description: string }[] }> {
    return this.request(`/projects/${projectId}/tasks/generate`, {
      method: 'POST',
      body: JSON.stringify({ count: Math.min(count, 50) }),
    });
  }

  async completeTask(taskId: string, data: { userId: string; whatIDid: string; codeSnippet?: string }) {
    return this.request(`/tasks/${taskId}/complete`, {
      method: 'POST',
      body: JSON.stringify(data),
    });
  }

  async updateTaskStatus(taskId: string, status: 'todo' | 'in_progress' | 'done', userId?: string): Promise<Task> {
    return this.request<Task>(`/tasks/${taskId}/status`, {
      method: 'PATCH',
      body: JSON.stringify({ status, userId }),
    });
  }

  // Members
  async getMembers(projectId: string): Promise<MembersResponse> {
    return this.request<MembersResponse>(`/projects/${projectId}/members`);
  }

  // Agent Control
  async enableAgent(projectId: string): Promise<{ message: string; project_id: string }> {
    return this.request(`/projects/${projectId}/agent/enable`, { method: 'POST' });
  }

  async disableAgent(projectId: string): Promise<{ message: string; project_id: string }> {
    return this.request(`/projects/${projectId}/agent/disable`, { method: 'POST' });
  }

  // Search & Activity
  async searchProject(projectId: string, query: string, filters?: { userId?: string; dateFrom?: string; dateTo?: string }) {
    return this.request(`/projects/${projectId}/search`, {
      method: 'POST',
      body: JSON.stringify({ query, filters }),
    });
  }

  async getActivity(projectId: string, limit = 20): Promise<ActivityResponse> {
    return this.request<ActivityResponse>(`/projects/${projectId}/activity?limit=${limit}`);
  }

  // Smart Query
  async smartQuery(projectId: string, query: string, currentUserId: string) {
    return this.request(`/projects/${projectId}/smart-query`, {
      method: 'POST',
      body: JSON.stringify({
        query,
        currentUserId,
        currentDatetime: new Date().toISOString(),
      }),
    });
  }

  // Task Chat (Agent)
  async taskChat(
    projectId: string,
    taskId: string,
    userId: string,
    message: string,
    history: { role: string; content: string }[]
  ): Promise<{ message: string; taskCompleted?: boolean; taskStatus?: string }> {
    return this.request(`/tasks/${taskId}/chat`, {
      method: 'POST',
      body: JSON.stringify({
        projectId,
        userId,
        message,
        history,
        currentDatetime: new Date().toISOString(),
      }),
    });
  }
}

export const api = new ApiClient();