/**
 * DELFOR to VDA 4905 Mapping Logic
 */
window.EDIBridge = window.EDIBridge || {};

class DELFORToVDA4905 {
    static convert(ediContent) {
        const EDIFACTLogic = window.EDIBridge.EDIFACTLogic;
        const segments = EDIFACTLogic.parseSegments(ediContent);
        const records = [];

        // Header Record 511
        records.push(this.format511({
            senderId: this.getNAD(segments, 'SE'),
            receiverId: this.getNAD(segments, 'BY'),
            date: this.getDTM(segments, '137')
        }));

        let currentMaterial = null;
        for (const seg of segments) {
            if (seg.tag === 'LIN') {
                currentMaterial = seg.elements[2][0];
            }
            if (seg.tag === 'QTY' && currentMaterial) {
                records.push(this.format512({ material: currentMaterial }));
                records.push(this.format513({
                    quantity: seg.elements[0][1],
                    date: '240520'
                }));
            }
        }

        records.push(this.format519(records.length + 1));

        return records.join('\n');
    }

    static getNAD(segments, qualifier) {
        const seg = segments.find(s => s.tag === 'NAD' && s.elements[0][0] === qualifier);
        return seg ? seg.elements[1][0] : 'UNKNOWN';
    }

    static getDTM(segments, qualifier) {
        const seg = segments.find(s => s.tag === 'DTM' && s.elements[0][0] === qualifier);
        return seg ? seg.elements[0][1] : '240101';
    }

    static format511(data) {
        let s = '511';
        s += '01';
        s += String(data.senderId).padEnd(9, ' ');
        s += String(data.receiverId).padEnd(9, ' ');
        s += '00001';
        s += String(data.date).substring(2, 8);
        return s.padEnd(128, ' ');
    }

    static format512(data) {
        let s = '512';
        s += '01';
        s += String(data.material).padEnd(22, ' ');
        return s.padEnd(128, ' ');
    }

    static format513(data) {
        let s = '513';
        s += '01';
        s += String(data.date).padEnd(6, ' ');
        s += String(Math.round(parseFloat(data.quantity))).padStart(12, '0');
        return s.padEnd(128, ' ');
    }

    static format519(count) {
        return ('519' + '01' + String(count).padStart(7, '0')).padEnd(128, ' ');
    }
}

window.EDIBridge.DELFORToVDA4905 = DELFORToVDA4905;