import { Alert } from 'react-native';
import pLimit from 'p-limit';
import { getMediaByDateRange } from './media';
import { processAndUploadMedia } from './uploader';
import { ExtendedAsset } from './types';
import { insertUploadTask, getUploadTaskStatus } from '../db';

// 设置最大并发数
const CONCURRENCY_LIMIT = 10; // 同时最多上传10个文件
const limit = pLimit(CONCURRENCY_LIMIT);

// 手动触发上传
export const triggerManualUpload = async (startDate: Date, endDate: Date) => {
    try {
        const media = await getMediaByDateRange(startDate, endDate);
        if (media.length === 0) {
            Alert.alert('提示', '在指定时间范围内未找到媒体文件');
            return [];
        }

        const uploadPromises = media.map((asset: ExtendedAsset) =>
            limit(async () => {
                const existingTask = await getUploadTaskStatus(asset.uri);
                if (!existingTask) {
                    await insertUploadTask(asset.uri, asset.filename);
                } else if (existingTask.status === 'success' || existingTask.status === 'skipped') {
                    console.log(`File ${asset.uri} already ${existingTask.status}, skipping processing.`);
                    return null; // Skip processing if already successful or skipped
                }
                return processAndUploadMedia(asset);
            })
        );

        const results = await Promise.all(uploadPromises);

        // 过滤掉因为已上传而返回 null 的结果
        const finalResults = results.filter(result => result !== null);

        console.log('Manual upload completed.', { 
            total: media.length, 
            uploaded: finalResults.length, 
            skipped: media.length - finalResults.length 
        });

        return finalResults;
    } catch (error) {
        console.error('手动上传过程中出现错误:', error);
        Alert.alert('错误', '上传过程中出现错误');
        throw error;
    }
};