const API_BASE_URL = '/api';

export const userService = {
  async changePassword(currentPassword: string, newPassword: string): Promise<{ message: string }> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users/password`, {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`,
      },
      body: JSON.stringify({
        currentPassword,
        newPassword,
      }),
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'パスワードの変更に失敗しました');
    }

    return response.json();
  },

  async getUsers(): Promise<any[]> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users`, {
      method: 'GET',
      headers: {
        'Authorization': `Bearer ${token}`,
      },
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'ユーザーリストの取得に失敗しました');
    }

    return response.json();
  },

  async updateUser(userId: string, isAdmin: boolean): Promise<{ message: string }> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users/${userId}`, {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`,
      },
      body: JSON.stringify({
        isAdmin,
      }),
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'ユーザー情報の更新に失敗しました');
    }

    return response.json();
  },

  async updateUserInfo(userId: string, userData: { isAdmin?: boolean; password?: string }): Promise<{ message: string }> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users/${userId}`, {
      method: 'PUT',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`,
      },
      body: JSON.stringify(userData),
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'ユーザー情報の更新に失敗しました');
    }

    return response.json();
  },

  async deleteUser(userId: string): Promise<{ message: string }> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users/${userId}`, {
      method: 'DELETE',
      headers: {
        'Authorization': `Bearer ${token}`,
      },
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'ユーザーの削除に失敗しました');
    }

    return response.json();
  },

  async createUser(username: string, password: string, isAdmin: boolean = false): Promise<{ message: string }> {
    const token = localStorage.getItem('authToken') || localStorage.getItem('token');

    const response = await fetch(`${API_BASE_URL}/users`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Bearer ${token}`,
      },
      body: JSON.stringify({
        username,
        password,
        isAdmin,
      }),
    });

    if (!response.ok) {
      const error = await response.json();
      throw new Error(error.message || 'ユーザーの作成に失敗しました');
    }

    return response.json();
  },
};