// Mock API service for demonstration
class BatchService {
    constructor() {
        this.batches = [];
        this.nextId = 1;
    }

    createBatch(type, file) {
        return new Promise((resolve) => {
            const newBatch = {
                id: this.nextId++,
                type,
                status: 'PENDING',
                fileName: file.name,
                createdAt: new Date().toISOString()
            };
            
            this.batches.unshift(newBatch);
            
            // Simulate async processing
            setTimeout(() => {
                newBatch.status = 'RUNNING';
                setTimeout(() => {
                    newBatch.status = 'COMPLETED';
                }, 2000);
            }, 1000);
            
            resolve(newBatch);
        });
    }

    getAllBatches() {
        return new Promise((resolve) => {
            resolve([...this.batches]);
        });
    }

    downloadResult(batchId) {
        return new Promise((resolve) => {
            // Simulate file download
            const batch = this.batches.find(b => b.id === batchId);
            if (batch) {
                const blob = new Blob([`Processed ${batch.type} results for ${batch.fileName}`], { type: 'text/plain' });
                const url = URL.createObjectURL(blob);
                const a = document.createElement('a');
                a.href = url;
                a.download = `processed_${batch.fileName.replace('.csv', '')}_${batchId}.txt`;
                document.body.appendChild(a);
                a.click();
                document.body.removeChild(a);
                URL.revokeObjectURL(url);
            }
            resolve();
        });
    }
}

// Initialize service
window.batchService = new BatchService();