// API Response structure from /api/user/me
export interface UserProfileResponse {
    id: number;
    username: string;
    email: string;
    updated_at: string;
    created_at: string;
    role: {
        code: string;
        name: {
            en: string;
            th: string;
        };
    };
    profile: {
        prefix: {
            en: string;
            th: string;
        };
        first_name: string;
        last_name: string;
        avatar_url: string | null;
        birth_date: string | null;
        phone: string | null;
    };
}

// Request body for PUT /api/user/me
export interface UpdateProfileRequest {
    prefix?: {
        en: string;
        th: string;
    };
    first_name: string;
    last_name: string;
    phone?: string | null;
    avatar_url?: string | null;
    birth_date?: string | null;
}

// Mock profile data for development
const MOCK_PROFILES: Record<string, UserProfileResponse> = {
    'admin@elearning.local': {
        id: 1,
        username: 'admin',
        email: 'admin@elearning.local',
        updated_at: '2024-01-01T00:00:00Z',
        created_at: '2024-01-01T00:00:00Z',
        role: {
            code: 'ADMIN',
            name: { en: 'Administrator', th: 'ผู้ดูแลระบบ' }
        },
        profile: {
            prefix: { en: 'Mr.', th: 'นาย' },
            first_name: 'ผู้ดูแล',
            last_name: 'ระบบ',
            avatar_url: null,
            birth_date: null,
            phone: '081-234-5678'
        }
    },
    'instructor@elearning.local': {
        id: 2,
        username: 'instructor',
        email: 'instructor@elearning.local',
        updated_at: '2024-01-01T00:00:00Z',
        created_at: '2024-01-01T00:00:00Z',
        role: {
            code: 'INSTRUCTOR',
            name: { en: 'Instructor', th: 'ผู้สอน' }
        },
        profile: {
            prefix: { en: 'Mr.', th: 'นาย' },
            first_name: 'อาจารย์',
            last_name: 'ทดสอบ',
            avatar_url: null,
            birth_date: null,
            phone: '081-234-5678'
        }
    }
};

// Helper function to get auth token from cookie
const getAuthToken = (): string => {
    const tokenCookie = useCookie('token');
    return tokenCookie.value || '';
};

export const userService = {
    async getProfile(): Promise<UserProfileResponse> {
        const config = useRuntimeConfig();
        const useMockData = config.public.useMockData as boolean;

        if (useMockData) {
            return this.mockGetProfile();
        }

        return this.apiGetProfile();
    },

    // Mock get profile
    async mockGetProfile(): Promise<UserProfileResponse> {
        await new Promise(resolve => setTimeout(resolve, 300));

        const userCookie = useCookie('user');
        if (!userCookie.value) throw new Error('User not found');

        const user = typeof userCookie.value === 'string'
            ? JSON.parse(userCookie.value)
            : userCookie.value;
        const mockProfile = MOCK_PROFILES[user.email];

        if (!mockProfile) {
            throw new Error('Profile not found');
        }

        return mockProfile;
    },

    // Real API get profile
    async apiGetProfile(): Promise<UserProfileResponse> {
        const config = useRuntimeConfig();
        const token = getAuthToken();

        const response = await $fetch<UserProfileResponse>('/api/user/me', {
            baseURL: config.public.apiBaseUrl as string,
            headers: {
                Authorization: `Bearer ${token}`
            }
        });

        return response;
    },

    async updateProfile(data: UpdateProfileRequest): Promise<UserProfileResponse> {
        const config = useRuntimeConfig();
        const useMockData = config.public.useMockData as boolean;

        if (useMockData) {
            await new Promise(resolve => setTimeout(resolve, 500));
            // In mock mode, just return the current profile with updates
            const profile = await this.mockGetProfile();
            return { ...profile, profile: { ...profile.profile, ...data } };
        }

        const token = getAuthToken();
        const response = await $fetch<UserProfileResponse>('/api/user/me', {
            method: 'PUT',
            baseURL: config.public.apiBaseUrl as string,
            headers: {
                Authorization: `Bearer ${token}`
            },
            body: data
        });

        return response;
    },

    async changePassword(oldPassword: string, newPassword: string): Promise<void> {
        const config = useRuntimeConfig();
        const useMockData = config.public.useMockData as boolean;

        if (useMockData) {
            await new Promise(resolve => setTimeout(resolve, 500));
            // In mock mode, just simulate success
            return;
        }

        const token = getAuthToken();
        await $fetch('/api/user/change-password', {
            method: 'POST',
            baseURL: config.public.apiBaseUrl as string,
            headers: {
                Authorization: `Bearer ${token}`
            },
            body: {
                oldPassword,
                newPassword
            }
        });
    },

    async uploadAvatar(file: File): Promise<{ avatar_url: string; id: number }> {
        const config = useRuntimeConfig();
        const useMockData = config.public.useMockData as boolean;

        if (useMockData) {
            await new Promise(resolve => setTimeout(resolve, 500));
            // Return mock URL
            return { avatar_url: URL.createObjectURL(file), id: 1 };
        }

        const token = getAuthToken();
        const formData = new FormData();
        formData.append('file', file);

        const response = await $fetch<{ code: number; message: string; data: { avatar_url: string; id: number } }>('/api/user/upload-avatar', {
            method: 'POST',
            baseURL: config.public.apiBaseUrl as string,
            headers: {
                Authorization: `Bearer ${token}`
            },
            body: formData
        });

        return response.data;
    }
};