var pcsc = require('pcsclite');

var pcsc = pcsc();
pcsc.on('reader', function(reader) {

    console.log('New reader detected', reader.name);

    reader.on('error', function(err) {
        console.log('Error(', this.name, '):', err.message);
    });

    reader.on('status', function(status) {
        console.log('Status(', this.name, '):', status);
        console.log(status.atr.toString());
        /* check what has changed */
        var changes = this.state ^ status.state;
        if (changes) {
            if ((changes & this.SCARD_STATE_EMPTY) && (status.state & this.SCARD_STATE_EMPTY)) {
                console.log("\n=== card removed");/* card removed */
                reader.disconnect(reader.SCARD_LEAVE_CARD, function(err) {
                    if (err) {
                        console.log(err);
                    } else {
                        console.log('Disconnected');
                    }
                });
            } else if ((changes & this.SCARD_STATE_PRESENT) && (status.state & this.SCARD_STATE_PRESENT)) {
                console.log("\n=== card inserted");/* card inserted */
                reader.connect({ share_mode : this.SCARD_SHARE_SHARED }, function(err, protocol) {
                    if (err) {
                        console.log(err);
                    } else {
                        console.log('Protocol(', reader.name, '):', protocol);
                        // reader.transmit(new Buffer([0x00, 0xB0, 0x00, 0x00, 0x20]), 40, protocol, function(err, data) {
                        //     if (err) {
                        //         console.log(err);
                        //     } else {
                        //         console.log('Data received', data);
                        //         // reader.close();
                        //         // pcsc.close();
                        //     }
                        // });


                        reader.transmit(new Buffer([0xFF, 0xCA, 0x00, 0x00, 0x00]), 40, protocol, function(err, data) {
                            if (err) {
                                console.log(err);
                            } else {

                                var hexs = [];
                                for(var i =0 ; i < data.length;++i){
                                    if(data[i] == 0x90 && i < data.length-1 && data[i+1] == 0x00){
                                        break;
                                    }
                                    hexs.push(data[i].toString(16));
                                }
                                hexs = hexs.reverse();
                                console.log('Data received',data.length, hexs.join(""),"tag id:",parseInt(hexs.join(""),16));

                                //感應到:D01ACD76 ,tag = 76CD1AD0, num= 1993153232


                                // reader.close();
                                // pcsc.close();
                            }
                        });
                    }
                });
            }
        }
    });

    reader.on('end', function() {
        console.log('Reader',  this.name, 'removed');
    });
});

pcsc.on('error', function(err) {
    console.log('PCSC error', err.message);
});