'use strict';
/** BSD-2-Clause license
 *
 * Copyright (c) 2018-2023 NST <www.newinfosec.ru>, sss <sss at dark-alexandr dot net>, smake <smake at ya dot ru>.
 *
 */

/**
 * File handle files in clipboard and dispath events on transferring
 */


class FileEntry {
	constructor(rdp, raw_ft, fileId) {
		if (raw_ft instanceof File) {
			this.file = raw_ft;
			var file = this.file;
			var filename  = new TextEncoder().encode(file.name);
			var raw_ft = new Uint8Array(
				new ArrayBuffer(2 + 4 + 8 + filename.length)
			);
			var name_len = new Uint16Array(1);
			var id = new Uint32Array(1);
			var size = new BigUint64Array(1);
			name_len[0] = filename.length;
			id[0] = fileId;
			size[0] = BigInt(file.size);
			raw_ft.set(new Uint8Array(name_len.buffer));
			raw_ft.set(new Uint8Array(id.buffer), 2);
			raw_ft.set(new Uint8Array(size.buffer), 2 + 4);
			raw_ft.set(filename, 2 + 4 + 8);

		}
		this.raw_ft = raw_ft;
		this.rdp = rdp;
		this.status = 0;
		this.name_len = new Uint16Array(this.raw_ft)[0];
		this.id = new Uint32Array(this.raw_ft.slice(2, 2 + 4))[0];
		this.size = new BigUint64Array(this.raw_ft.slice(6, 14).buffer)[0];
		this.log = true;
		this.transfer_id = null;
		this.chunkSize = BigInt(8192);
		this.offset = BigInt(0);
		this.chunks = [];
		this.lastChunkTime = null;
		this.lastOffset = BigInt(0);
		this.timout = 120;
		this.refreshTimeout = 3;
		return this;
	}

	get fullname() {
		var fullname = new Uint8Array(this.raw_ft.slice(14, 14 + this.name_len));
		fullname =	new TextDecoder("utf-8").decode(fullname.filter(v => v != 0));
		return fullname;
	}

	get isTransferring() {
		if (this.status == 2) {
			var now = new Date();
			var timeleft = Math.floor((now - this.lastChunkTime)/100);
			if (!this.lastChunkTime) {
				return true;
			}
			if ( timeleft > this.timout ) {
				this.SendFtFinish();
				return false;
			} else {
				return true;
			}
		} else {
			return false;
		}
	}

	get name() {
		var name = this.fullname.split('/').pop();
		name = name.split('\\').pop();
		return name;
	}

	get nextChunkRequest() {
		if (this.offset >= this.size) {
			this.status = 0;
			return;
		}
		this.status = 2; //transfer in progress
		var buf = new ArrayBuffer(4 + 4 + 8 + 8);
		var c = new Uint32Array(buf, 0, 1);
		c[0] = 0x09; // ws_in_ft_request
		var file_id = new Uint32Array(buf, 4, 1);
		var req_size = new BigUint64Array(buf, 4 + 4, 1);
		var file_offset  = new BigUint64Array(buf, 4 + 4 + 8, 1);
		file_id[0] = this.id;
		req_size[0] = this.size;
		file_offset[0] = this.offset;

		return buf
	}

	get progress () {
		if (this.status == 2) {
			return '(' + this.chunks.length + "/" + this.size / this.chunkSize + ')';
		} else {
			return "";
		}
	}

	get percents () {
		if (this.status == 2) {
			return Math.floor((this.chunks.length / parseInt(this.size / this.chunkSize)) * 100);
		} else {
			return "";
		}
	}

	get sizeHumanReadable() {
		var bytes = parseInt(this.size);
		return this.sizeParse(this.size);
	}

	get speed () {
		if (this.status == 2) {
			var bytes = parseInt(this.offset - this.lastOffset);
			return this.sizeParse(Math.floor(bytes / this.refreshTimeout));
		} else {
			return "";
		}
	}

	get uiElement () {
		var html = "";
		if (!this.file) {
			if ( this.size < BigInt(2147483647) ){
				html += '<li class="tab-menu" onclick="rdp.cbd.ClipoboardFileGet('+this.id+')">'
				html += '<a>'
			} else {
				html += '<li class="tab-menu">';
				html += '<a style="background-color: #555">(' + lables.file_lager_then_2g +') '
			}
		} else {
			html += '<li class="tab-menu">'
			html += '<a>'
		}
		if (this.status == 2) {
			html += this.id + ': ' +  this.name + ': '  + this.sizeHumanReadable + " " + this.percents + "% (" + this.speed + "/sec)" +'</li>'
		} else {
			html += this.id + ': ' +  this.name + ': '  + this.sizeHumanReadable + '</li>'
		}
		html += '</a></li>'
		return html;

	}

	newChunk(data) {
		var size = BigInt(new Uint32Array(data,0,3)[2]);
		this.transfer_id = new Uint32Array(data,0,3)[1];
		if (this.log) {
			var f = this;
			setTimeout(function () {
					f.log = true;
			}, this.refreshTimeout * 1000);
			// console.log(f.name + ": " + f.progress);
			f.log = false;
			this.rdp.cbd.update();
			f.lastOffset = f.offset;
		}
		if (this.status == 2 && new Uint32Array(data,0,3)[2] != 0 ) {
			if (this.offset + size >= this.size) {
				this.status = 0;
				this.lastChunkTime = new Date();
				this.chunks.push(data.slice(12));
				this.offset += size;
				this.pushFileDownload();
			} else {
				this.lastChunkTime = new Date();
				this.chunks.push(data.slice(12));
				this.offset += size;
			}
		}
	}

	sendChunk(req_size, offset) {
		if (!this.transfer_id) {
			this.transfer_id = (Math.random() * 4294967292).round(0);
		}
		this.status = 2;

		var offset = parseInt(offset);
		var req_size = parseInt(req_size);

		var blob = this.file.slice(offset, offset + req_size);
		var reader = new FileReader();
		reader.fe = this;
		reader.onload = function(e) {
			var file = e.target.fe;
			var sock = e.target.fe.rdp.sock;
			var c = e.target.result;
			var buf = new ArrayBuffer(4 + 4 + 4 + c.byteLength);
			var cmd = new Uint32Array(buf, 0, 3);
			var transfer_id = new Uint32Array(buf, 0, 3);
			var size = new Uint32Array(buf, 0, 3);
			var data = new Uint8Array(buf)
			cmd[0] = 0x0a; // ws_in_ft_chunk
			transfer_id[1] = file.transfer_id;
			size[2] = c.byteLength;
			data.set(new Uint8Array(c), 12);
			// console.log("Sending chunk:" + (buf.byteLength - 12));
			// console.log(buf.toHexdump());
			file.lastChunkTime = new Date();
			sock.send(buf);
			file.offset += BigInt(c.byteLength);
			file.lastOffset = file.offset;
			if (file.offset >= file.size) {
				file.SendFtFinish();
			}
		};
		reader.onerror = function(e) {
			var file = e.target.fe;
			var msg = file.name + ": " + e.target.error.message;
			file.rdp.fireEvent('alert', msg);
			file.SendFtFinish();
		};
		reader.readAsArrayBuffer(blob);
	}

	SendFtFinish() {
		if (this.offset >= this.size) {
			this.status = 0;
		} else {
			this.status = 1;
		}
		var buf = new ArrayBuffer(4 + 4 + 4 + 1);
		var cmd = new Uint32Array(buf, 0, 1);
		var id = new Uint32Array(buf, 4, 1);
		var transfer_id = new Uint32Array(buf, 8, 1);
		var status = new Uint8Array(buf, 12, 1);
		cmd[0] = 0x0b; // ws_in_ft_finished
		id[0] = this.id;
		transfer_id[0] = this.transfer_id;
		status[0] = this.status;

		// console.log(buf.toHexdump());
		this.rdp.sock.send(buf);
		return;
	}

	sizeParse(bytes) {
		var bytes = parseInt(bytes);
		var decimals = null;
		if(bytes == 0) return '0 Bytes';
		var k = 1024;
		var dm = decimals <= 0 ? 0 : decimals || 2;
		var sizes = lables.size_names;
		var i = Math.floor(Math.log(bytes) / Math.log(k));
		return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
	}

	pushFileDownload () {
		var blob = new Blob(this.chunks)
		var url = window.URL.createObjectURL(blob);
		var a = document.createElement("a");
		document.body.appendChild(a);
		a.style = "display: none";
		a.href = url;
		a.download = this.name;
		a.click();
		window.URL.revokeObjectURL(url);
		this.chunks = [];
	}

	getFile() {
		if (this.rdp.sock.readyState == this.rdp.sock.OPEN) {
			this.log.debug('requesting file transfer', 1);
			var buf = this.nextChunkRequest;
			// console.log(buf.toHexdump());
			this.rdp.sock.send(buf);
		};
	}

	// startSending(offset) {
	// 	if (!this.transfer_id) {
	// 		this.transfer_id = (Math.random() * 4294967292).round(0);
	// 	}
	// 	this.status = 3;

	// 	var offset = parseInt(0);
	// 	var chunkSize = parseInt(8);
	// 	var blob = this.file.slice(offset, offset + chunkSize);
	// 	var reader = new FileReader();
	// 	reader.fe = this;
	// 	reader.onload = function(e) {
	// 		var file = e.target.fe;
	// 		var sock = e.target.fe.rdp.sock;
	// 		var c = e.target.result;
	// 		var buf = new ArrayBuffer(4 + 4 + 4 + c.byteLength);
	// 		var cmd = new Uint32Array(buf, 0, 3);
	// 		var transfer_id = new Uint32Array(buf, 0, 3);
	// 		var size = new Uint32Array(buf, 0, 3);
	// 		var data = new Uint8Array(buf)
	// 		cmd[0] = 0x0a; // ws_in_ft_chunk
	// 		transfer_id[1] = file.transfer_id;
	// 		size[2] = c.byteLength;
	// 		data.set(new Uint8Array(c), 12);
	// 		console.log("Sending chunk:" + (buf.byteLength - 12));
	// 		// console.log(buf.toHexdump());
	// 		sock.send(buf);
	// 		file.offset += BigInt(c.byteLength);
	// 		file.sendNextChunk();
	// 	};
	// 	reader.readAsArrayBuffer(blob);
	// }


	// sendNextChunk() {
	// 	if (this.status != 3) {
	// 		return;
	// 	}
	// 	if (this.offset >= this.size) {
	// 		this.status = 0;
	// 		var buf = new ArrayBuffer(4 + 4 + 4 + 1);
	// 		var cmd = new Uint32Array(buf, 0, 1);
	// 		var id = new Uint32Array(buf, 4, 1);
	// 		var transfer_id = new Uint32Array(buf, 8, 1);
	// 		var status = new Uint8Array(buf, 9, 1);
	// 		cmd[0] = 0x0b; // ws_in_ft_finished
	// 		id[0] = this.id;
	// 		transfer_id[0] = this.transfer_id;
	// 		status[0] = 0;

	// 		console.log(buf.toHexdump());
	// 		this.rdp.sock.send(buf);
	// 		return;
	// 	}
	// 	var offset = parseInt(this.offset);
	// 	var chunkSize = parseInt(this.chunkSize);
	// 	var blob = this.file.slice(offset, offset + chunkSize);
	// 	var reader = new FileReader();
	// 	reader.fe = this;
	// 	reader.onload = function(e) {
	// 		var file = e.target.fe;
	// 		var sock = e.target.fe.rdp.sock;
	// 		var c = e.target.result;
	// 		var buf = new ArrayBuffer(4 + 4 + 4 + c.byteLength);
	// 		var cmd = new Uint32Array(buf, 0, 3);
	// 		var transfer_id = new Uint32Array(buf, 0, 3);
	// 		var size = new Uint32Array(buf, 0, 3);
	// 		var data = new Uint8Array(buf)
	// 		cmd[0] = 0x0a; // ws_in_ft_chunk
	// 		transfer_id[1] = file.transfer_id;
	// 		size[2] = c.byteLength;
	// 		data.set(new Uint8Array(c), 12);
	// 		console.log("Sending chunk:" + (buf.byteLength - 12));
	// 		// console.log(buf.toHexdump());
	// 		sock.send(buf);
	// 		file.offset += BigInt(c.byteLength);
	// 		file.sendNextChunk();
	// 	};
	// 	reader.readAsArrayBuffer(blob);
	// }
}