/**
 * API Client for FastAPI Backend
 * 
 * Centralized API calls to the FastAPI backend.
 * Used by frontend components to call the new Python backend.
 */

const API_BASE = process.env.NEXT_PUBLIC_API_URL || 'http://localhost:8000';

// Types
export interface GenerateParams {
    prompt: string;
    aspectRatio?: string;
    refs?: { subject?: string | string[]; scene?: string | string[]; style?: string | string[] };
    preciseMode?: boolean;
    imageCount?: number;
    cookies: string;
}

export interface GeneratedImage {
    data: string;
    index?: number;
    prompt: string;
    aspectRatio: string;
}

export interface VideoParams {
    prompt: string;
    imageBase64?: string;
    imageGenerationId?: string;
    cookies: string;
}

export interface ReferenceUploadParams {
    imageBase64: string;
    mimeType: string;
    category: string;
    cookies: string;
}

export interface MetaGenerateParams {
    prompt: string;
    cookies?: string;
    imageCount?: number;
    aspectRatio?: string;
    useMetaFreeWrapper?: boolean;
    metaFreeWrapperUrl?: string;
}

// Helper to handle API responses
async function handleResponse<T>(response: Response): Promise<T> {
    if (!response.ok) {
        const error = await response.json().catch(() => ({ error: 'Request failed' }));
        throw new Error(error.error || error.detail || `HTTP ${response.status}`);
    }
    return response.json();
}

/**
 * Generate images using Whisk API
 */
export async function generateImages(params: GenerateParams): Promise<{ images: GeneratedImage[] }> {
    const response = await fetch(`${API_BASE}/generate`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(params)
    });
    return handleResponse(response);
}

/**
 * Generate video using Whisk API
 */
export async function generateVideo(params: VideoParams): Promise<{
    success: boolean;
    id?: string;
    url?: string;
    status?: string;
}> {
    const response = await fetch(`${API_BASE}/video/generate`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(params)
    });
    return handleResponse(response);
}

/**
 * Upload reference image
 */
export async function uploadReference(params: ReferenceUploadParams): Promise<{
    success: boolean;
    id: string;
}> {
    const response = await fetch(`${API_BASE}/references/upload`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(params)
    });
    return handleResponse(response);
}

/**
 * Generate images using Meta AI
 */
export async function generateMetaImages(params: MetaGenerateParams): Promise<{
    success: boolean;
    images: Array<{
        data?: string;
        url?: string;
        prompt: string;
        model: string;
        aspectRatio: string;
    }>;
}> {
    const response = await fetch(`${API_BASE}/meta/generate`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(params)
    });
    return handleResponse(response);
}

/**
 * Get prompts from library
 */
export async function getPrompts(): Promise<{
    prompts: any[];
    last_updated: string | null;
    lastSync: number | null;
    categories: Record<string, string[]>;
    total_count: number;
    sources: string[];
}> {
    const response = await fetch(`${API_BASE}/prompts`);
    return handleResponse(response);
}

/**
 * Sync prompts from sources
 */
export async function syncPrompts(): Promise<{
    success: boolean;
    count: number;
    added: number;
}> {
    const response = await fetch(`${API_BASE}/prompts/sync`, {
        method: 'POST'
    });
    return handleResponse(response);
}

/**
 * Track prompt usage
 */
export async function trackPromptUse(promptId: number): Promise<{
    success: boolean;
    promptId: number;
    useCount: number;
    lastUsedAt: number;
}> {
    const response = await fetch(`${API_BASE}/prompts/use`, {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ promptId })
    });
    return handleResponse(response);
}

/**
 * Get upload history
 */
export async function getHistory(category?: string): Promise<{
    history: Array<{
        id: string;
        url: string;
        originalName: string;
        category: string;
        mediaId?: string;
        createdAt?: number;
    }>;
}> {
    const url = category ? `${API_BASE}/history?category=${category}` : `${API_BASE}/history`;
    const response = await fetch(url);
    return handleResponse(response);
}

/**
 * Upload to history
 */
export async function uploadToHistory(file: File, category: string, cookies?: string): Promise<{
    id: string;
    url: string;
    originalName: string;
    category: string;
    mediaId?: string;
}> {
    const formData = new FormData();
    formData.append('file', file);
    formData.append('category', category);
    if (cookies) formData.append('cookies', cookies);

    const response = await fetch(`${API_BASE}/history`, {
        method: 'POST',
        body: formData
    });
    return handleResponse(response);
}

/**
 * Delete history item
 */
export async function deleteHistoryItem(itemId: string): Promise<{ success: boolean }> {
    const response = await fetch(`${API_BASE}/history/${itemId}`, {
        method: 'DELETE'
    });
    return handleResponse(response);
}

/**
 * Clear all history
 */
export async function clearHistory(): Promise<{ success: boolean }> {
    const response = await fetch(`${API_BASE}/history`, {
        method: 'DELETE'
    });
    return handleResponse(response);
}

/**
 * Health check
 */
export async function healthCheck(): Promise<{ status: string; service: string; version: string }> {
    const response = await fetch(`${API_BASE}/health`);
    return handleResponse(response);
}