// API 기본 설정
const API_BASE_URL = '/api';

// 토큰 관리
const TokenManager = {
    getToken: () => localStorage.getItem('access_token'),
    setToken: (token) => localStorage.setItem('access_token', token),
    removeToken: () => localStorage.removeItem('access_token'),
    
    getUser: () => {
        const userStr = localStorage.getItem('current_user');
        return userStr ? JSON.parse(userStr) : null;
    },
    setUser: (user) => localStorage.setItem('current_user', JSON.stringify(user)),
    removeUser: () => localStorage.removeItem('current_user')
};

// API 요청 헬퍼
async function apiRequest(endpoint, options = {}) {
    const token = TokenManager.getToken();
    
    const defaultHeaders = {
        'Content-Type': 'application/json',
    };
    
    if (token) {
        defaultHeaders['Authorization'] = `Bearer ${token}`;
    }
    
    const config = {
        ...options,
        headers: {
            ...defaultHeaders,
            ...options.headers
        }
    };
    
    try {
        const response = await fetch(`${API_BASE_URL}${endpoint}`, config);
        
        if (response.status === 401) {
            // 인증 실패 시 로그인 페이지로
            TokenManager.removeToken();
            TokenManager.removeUser();
            window.location.href = '/index.html';
            return;
        }
        
        if (!response.ok) {
            const error = await response.json();
            console.error('API Error Response:', error);
            console.error('Error details:', JSON.stringify(error, null, 2));
            
            // 422 에러의 경우 validation 에러 메시지 추출
            if (response.status === 422 && error.detail && Array.isArray(error.detail)) {
                const validationErrors = error.detail.map(err => 
                    `${err.loc ? err.loc.join('.') : 'field'}: ${err.msg}`
                ).join(', ');
                throw new Error(`입력값 검증 오류: ${validationErrors}`);
            }
            
            throw new Error(error.detail || 'API 요청 실패');
        }
        
        return await response.json();
    } catch (error) {
        console.error('API 요청 에러:', error);
        throw error;
    }
}

// Auth API
const AuthAPI = {
    login: async (username, password) => {
        const formData = new URLSearchParams();
        formData.append('username', username);
        formData.append('password', password);
        
        const response = await fetch(`${API_BASE_URL}/auth/login`, {
            method: 'POST',
            headers: {
                'Content-Type': 'application/x-www-form-urlencoded'
            },
            body: formData.toString()
        });
        
        if (!response.ok) {
            const error = await response.json();
            throw new Error(error.detail || '로그인 실패');
        }
        
        const data = await response.json();
        TokenManager.setToken(data.access_token);
        TokenManager.setUser(data.user);
        return data;
    },
    
    logout: () => {
        TokenManager.removeToken();
        TokenManager.removeUser();
        window.location.href = '/index.html';
    },
    
    getMe: () => apiRequest('/auth/me'),
    
    createUser: (userData) => apiRequest('/auth/users', {
        method: 'POST',
        body: JSON.stringify(userData)
    }),
    
    getUsers: () => apiRequest('/auth/users'),
    
    updateUser: (userId, userData) => apiRequest(`/auth/users/${userId}`, {
        method: 'PUT',
        body: JSON.stringify(userData)
    }),
    
    deleteUser: (userId) => apiRequest(`/auth/users/${userId}`, {
        method: 'DELETE'
    }),
    
    changePassword: (currentPassword, newPassword) => apiRequest('/auth/change-password', {
        method: 'POST',
        body: JSON.stringify({
            current_password: currentPassword,
            new_password: newPassword
        })
    }),
    
    resetPassword: (userId, newPassword = '000000') => apiRequest(`/auth/users/${userId}`, {
        method: 'PUT',
        body: JSON.stringify({
            password: newPassword
        })
    })
};

// Issues API
const IssuesAPI = {
    create: async (issueData) => {
        // photos 배열 처리 (최대 2장)
        const dataToSend = {
            category: issueData.category,
            description: issueData.description,
            project_id: issueData.project_id,
            photo: issueData.photos && issueData.photos.length > 0 ? issueData.photos[0] : null,
            photo2: issueData.photos && issueData.photos.length > 1 ? issueData.photos[1] : null
        };
        
        return apiRequest('/issues/', {
            method: 'POST',
            body: JSON.stringify(dataToSend)
        });
    },
    
    getAll: (params = {}) => {
        const queryString = new URLSearchParams(params).toString();
        return apiRequest(`/issues/${queryString ? '?' + queryString : ''}`);
    },
    
    get: (id) => apiRequest(`/issues/${id}`),
    
    update: (id, issueData) => apiRequest(`/issues/${id}`, {
        method: 'PUT',
        body: JSON.stringify(issueData)
    }),
    
    delete: (id) => apiRequest(`/issues/${id}`, {
        method: 'DELETE'
    }),
    
    getStats: () => apiRequest('/issues/stats/summary')
};

// Daily Work API
const DailyWorkAPI = {
    create: (workData) => apiRequest('/daily-work/', {
        method: 'POST',
        body: JSON.stringify(workData)
    }),
    
    getAll: (params = {}) => {
        const queryString = new URLSearchParams(params).toString();
        return apiRequest(`/daily-work/${queryString ? '?' + queryString : ''}`);
    },
    
    get: (id) => apiRequest(`/daily-work/${id}`),
    
    update: (id, workData) => apiRequest(`/daily-work/${id}`, {
        method: 'PUT',
        body: JSON.stringify(workData)
    }),
    
    delete: (id) => apiRequest(`/daily-work/${id}`, {
        method: 'DELETE'
    }),
    
    getStats: (params = {}) => {
        const queryString = new URLSearchParams(params).toString();
        return apiRequest(`/daily-work/stats/summary${queryString ? '?' + queryString : ''}`);
    }
};

// Reports API
const ReportsAPI = {
    getSummary: (startDate, endDate) => apiRequest('/reports/summary', {
        method: 'POST',
        body: JSON.stringify({
            start_date: startDate,
            end_date: endDate
        })
    }),
    
    getIssues: (startDate, endDate) => {
        const params = new URLSearchParams({
            start_date: startDate,
            end_date: endDate
        }).toString();
        return apiRequest(`/reports/issues?${params}`);
    },
    
    getDailyWorks: (startDate, endDate) => {
        const params = new URLSearchParams({
            start_date: startDate,
            end_date: endDate
        }).toString();
        return apiRequest(`/reports/daily-works?${params}`);
    }
};

// 권한 체크
function checkAuth() {
    const user = TokenManager.getUser();
    if (!user) {
        window.location.href = '/index.html';
        return null;
    }
    return user;
}

function checkAdminAuth() {
    const user = checkAuth();
    if (user && user.role !== 'admin') {
        alert('관리자 권한이 필요합니다.');
        window.location.href = '/index.html';
        return null;
    }
    return user;
}

// 프로젝트 API
const ProjectsAPI = {
    getAll: (activeOnly = false) => {
        const params = activeOnly ? '?active_only=true' : '';
        return apiRequest(`/projects${params}`);
    },
    
    get: (id) => apiRequest(`/projects/${id}`),
    
    create: (projectData) => apiRequest('/projects', {
        method: 'POST',
        body: JSON.stringify(projectData)
    }),
    
    update: (id, projectData) => apiRequest(`/projects/${id}`, {
        method: 'PUT',
        body: JSON.stringify(projectData)
    }),
    
    delete: (id) => apiRequest(`/projects/${id}`, {
        method: 'DELETE'
    })
};