export const fileToBase64 = (file: File): Promise<string> => {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.readAsDataURL(file);
        reader.onload = () => {
            const result = reader.result as string;
            // remove "data:*/*;base64," prefix
            resolve(result.split(',')[1]);
        };
        reader.onerror = (error) => reject(error);
    });
};

export const parseCsv = (csvText: string): Record<string, string>[] => {
    const lines = csvText.trim().split('\n');
    if (lines.length < 2) return [];

    const headers = lines[0].split(',').map(h => h.trim());
    const data = [];
    const regex = /(?:^|,)(\"(?:[^\"]+|\"\")*\"|[^,]*)/g;

    for (let i = 1; i < lines.length; i++) {
        const values = [];
        let match;
        while ((match = regex.exec(lines[i]))) {
            let value = match[1];
            if (value.startsWith('"') && value.endsWith('"')) {
                value = value.substring(1, value.length - 1).replace(/""/g, '"');
            }
            values.push(value.trim());
        }
        
        if (values.length === headers.length) {
            const entry = headers.reduce((obj, header, index) => {
                obj[header] = values[index];
                return obj;
            }, {} as Record<string, string>);
            data.push(entry);
        }
    }
    return data;
};