/*
Copyright (c) 2013 Gildas Lormeau. All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright 
notice, this list of conditions and the following disclaimer in 
the documentation and/or other materials provided with the distribution.

3. The names of the authors may not be used to endorse or promote products
derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JCRAFT,
INC. OR ANY CONTRIBUTORS TO THIS SOFTWARE BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

import zip from './zip';

var CHUNK_SIZE = 512 * 1024;

var TextWriter = zip.TextWriter, //
BlobWriter = zip.BlobWriter, //
Data64URIWriter = zip.Data64URIWriter, //
Reader = zip.Reader, //
TextReader = zip.TextReader, //
BlobReader = zip.BlobReader, //
Data64URIReader = zip.Data64URIReader, //
createReader = zip.createReader, //
createWriter = zip.createWriter;

function ZipBlobReader(entry) {
	var that = this, blobReader;

	function init(callback) {
		that.size = entry.uncompressedSize;
		callback();
	}

	function getData(callback) {
		if (that.data)
			callback();
		else
			entry.getData(new BlobWriter(), function(data) {
				that.data = data;
				blobReader = new BlobReader(data);
				callback();
			}, null, that.checkCrc32);
	}

	function readUint8Array(index, length, callback, onerror) {
		getData(function() {
			blobReader.readUint8Array(index, length, callback, onerror);
		}, onerror);
	}

	that.size = 0;
	that.init = init;
	that.readUint8Array = readUint8Array;
}
ZipBlobReader.prototype = new Reader();
ZipBlobReader.prototype.constructor = ZipBlobReader;
ZipBlobReader.prototype.checkCrc32 = false;

function getTotalSize(entry) {
	var size = 0;

	function process(entry) {
		size += entry.uncompressedSize || 0;
		entry.children.forEach(process);
	}

	process(entry);
	return size;
}

function initReaders(entry, onend, onerror) {
	var index = 0;

	function next() {
		index++;
		if (index < entry.children.length)
			process(entry.children[index]);
		else
			onend();
	}

	function process(child) {
		if (child.directory)
			initReaders(child, next, onerror);
		else {
			child.reader = new child.Reader(child.data, onerror);
			child.reader.init(function() {
				child.uncompressedSize = child.reader.size;
				next();
			});
		}
	}

	if (entry.children.length)
		process(entry.children[index]);
	else
		onend();
}

function detach(entry) {
	var children = entry.parent.children;
	children.forEach(function(child, index) {
		if (child.id == entry.id)
			children.splice(index, 1);
	});
}

function exportZip(zipWriter, entry, onend, onprogress, totalSize) {
	var currentIndex = 0;

	function process(zipWriter, entry, onend, onprogress, totalSize) {
		var childIndex = 0;

		function exportChild() {
			var child = entry.children[childIndex];
			if (child)
				zipWriter.add(child.getFullname(), child.reader, function() {
					currentIndex += child.uncompressedSize || 0;
					process(zipWriter, child, function() {
						childIndex++;
						exportChild();
					}, onprogress, totalSize);
				}, function(index) {
					if (onprogress)
						onprogress(currentIndex + index, totalSize);
				}, {
					directory : child.directory,
					version : child.zipVersion
				});
			else
				onend();
		}

		exportChild();
	}

	process(zipWriter, entry, onend, onprogress, totalSize);
}

function addFileEntry(zipEntry, fileEntry, onend, onerror) {
	function getChildren(fileEntry, callback) {
		var entries = [];
		if (fileEntry.isDirectory) {
			var directoryReader = fileEntry.createReader();
			(function readEntries() {
				directoryReader.readEntries(function(temporaryEntries) {
					if (!temporaryEntries.length)
						callback(entries);
					else {
						entries = entries.concat(temporaryEntries);
						readEntries();
					}
				}, onerror);
			})();
		}
		if (fileEntry.isFile)
			callback(entries);
	}

	function process(zipEntry, fileEntry, onend) {
		getChildren(fileEntry, function(children) {
			var childIndex = 0;

			function addChild(child) {
				function nextChild(childFileEntry) {
					process(childFileEntry, child, function() {
						childIndex++;
						processChild();
					});
				}

				if (child.isDirectory)
					nextChild(zipEntry.addDirectory(child.name));
				if (child.isFile)
					child.file(function(file) {
						var childZipEntry = zipEntry.addBlob(child.name, file);
						childZipEntry.uncompressedSize = file.size;
						nextChild(childZipEntry);
					}, onerror);
			}

			function processChild() {
				var child = children[childIndex];
				if (child)
					addChild(child);
				else
					onend();
			}

			processChild();
		});
	}

	if (fileEntry.isDirectory)
		process(zipEntry, fileEntry, onend);
	else
		fileEntry.file(function(file) {
			zipEntry.addBlob(fileEntry.name, file);
			onend();
		}, onerror);
}

function getFileEntry(fileEntry, entry, onend, onprogress, onerror, totalSize, checkCrc32) {
	var currentIndex = 0;

	function process(fileEntry, entry, onend, onprogress, onerror, totalSize) {
		var childIndex = 0;

		function addChild(child) {
			function nextChild(childFileEntry) {
				currentIndex += child.uncompressedSize || 0;
				process(childFileEntry, child, function() {
					childIndex++;
					processChild();
				}, onprogress, onerror, totalSize);
			}

			if (child.directory)
				fileEntry.getDirectory(child.name, {
					create : true
				}, nextChild, onerror);
			else
				fileEntry.getFile(child.name, {
					create : true
				}, function(file) {
					child.getData(new zip.FileWriter(file, zip.getMimeType(child.name)), nextChild, function(index) {
						if (onprogress)
							onprogress(currentIndex + index, totalSize);
					}, checkCrc32);
				}, onerror);
		}

		function processChild() {
			var child = entry.children[childIndex];
			if (child)
				addChild(child);
			else
				onend();
		}

		processChild();
	}

	if (entry.directory)
		process(fileEntry, entry, onend, onprogress, onerror, totalSize);
	else
		entry.getData(new zip.FileWriter(fileEntry, zip.getMimeType(entry.name)), onend, onprogress, checkCrc32);
}

function resetFS(fs) {
	fs.entries = [];
	fs.root = new ZipDirectoryEntry(fs);
}

function bufferedCopy(reader, writer, onend, onprogress, onerror) {
	var chunkIndex = 0;

	function stepCopy() {
		var index = chunkIndex * CHUNK_SIZE;
		if (onprogress)
			onprogress(index, reader.size);
		if (index < reader.size)
			reader.readUint8Array(index, Math.min(CHUNK_SIZE, reader.size - index), function(array) {
				writer.writeUint8Array(new Uint8Array(array), function() {
					chunkIndex++;
					stepCopy();
				});
			}, onerror);
		else
			writer.getData(onend);
	}

	stepCopy();
}

function addChild(parent, name, params, directory) {
	if (parent.directory)
		return directory ? new ZipDirectoryEntry(parent.fs, name, params, parent) : new ZipFileEntry(parent.fs, name, params, parent);
	else
		throw "Parent entry is not a directory.";
}

function ZipEntry() {
}

ZipEntry.prototype = {
	init : function(fs, name, params, parent) {
		var that = this;
		if (fs.root && parent && parent.getChildByName(name))
			throw "Entry filename already exists.";
		if (!params)
			params = {};
		that.fs = fs;
		that.name = name;
		that.id = fs.entries.length;
		that.parent = parent;
		that.children = [];
		that.zipVersion = params.zipVersion || 0x14;
		that.uncompressedSize = 0;
		fs.entries.push(that);
		if (parent)
			that.parent.children.push(that);
	},
	getFileEntry : function(fileEntry, onend, onprogress, onerror, checkCrc32) {
		var that = this;
		initReaders(that, function() {
			getFileEntry(fileEntry, that, onend, onprogress, onerror, getTotalSize(that), checkCrc32);
		}, onerror);
	},
	moveTo : function(target) {
		var that = this;
		if (target.directory) {
			if (!target.isDescendantOf(that)) {
				if (that != target) {
					if (target.getChildByName(that.name))
						throw "Entry filename already exists.";
					detach(that);
					that.parent = target;
					target.children.push(that);
				}
			} else
				throw "Entry is a ancestor of target entry.";
		} else
			throw "Target entry is not a directory.";
	},
	getFullname : function() {
		var that = this, fullname = that.name, entry = that.parent;
		while (entry) {
			fullname = (entry.name ? entry.name + "/" : "") + fullname;
			entry = entry.parent;
		}
		return fullname;
	},
	isDescendantOf : function(ancestor) {
		var entry = this.parent;
		while (entry && entry.id != ancestor.id)
			entry = entry.parent;
		return !!entry;
	}
};
ZipEntry.prototype.constructor = ZipEntry;

var ZipFileEntryProto;

function ZipFileEntry(fs, name, params, parent) {
	var that = this;
	ZipEntry.prototype.init.call(that, fs, name, params, parent);
	that.Reader = params.Reader;
	that.Writer = params.Writer;
	that.data = params.data;
	if (params.getData) {
		that.getData = params.getData;
	}
}

ZipFileEntry.prototype = ZipFileEntryProto = new ZipEntry();
ZipFileEntryProto.constructor = ZipFileEntry;
ZipFileEntryProto.getData = function(writer, onend, onprogress, onerror) {
	var that = this;
	if (!writer || (writer.constructor == that.Writer && that.data))
		onend(that.data);
	else {
		if (!that.reader)
			that.reader = new that.Reader(that.data, onerror);
		that.reader.init(function() {
			writer.init(function() {
				bufferedCopy(that.reader, writer, onend, onprogress, onerror);
			}, onerror);
		});
	}
};

ZipFileEntryProto.getText = function(onend, onprogress, checkCrc32, encoding) {
	this.getData(new TextWriter(encoding), onend, onprogress, checkCrc32);
};
ZipFileEntryProto.getBlob = function(mimeType, onend, onprogress, checkCrc32) {
	this.getData(new BlobWriter(mimeType), onend, onprogress, checkCrc32);
};
ZipFileEntryProto.getData64URI = function(mimeType, onend, onprogress, checkCrc32) {
	this.getData(new Data64URIWriter(mimeType), onend, onprogress, checkCrc32);
};

var ZipDirectoryEntryProto;

function ZipDirectoryEntry(fs, name, params, parent) {
	var that = this;
	ZipEntry.prototype.init.call(that, fs, name, params, parent);
	that.directory = true;
}

ZipDirectoryEntry.prototype = ZipDirectoryEntryProto = new ZipEntry();
ZipDirectoryEntryProto.constructor = ZipDirectoryEntry;
ZipDirectoryEntryProto.addDirectory = function(name) {
	return addChild(this, name, null, true);
};
ZipDirectoryEntryProto.addText = function(name, text) {
	return addChild(this, name, {
		data : text,
		Reader : TextReader,
		Writer : TextWriter
	});
};
ZipDirectoryEntryProto.addBlob = function(name, blob) {
	return addChild(this, name, {
		data : blob,
		Reader : BlobReader,
		Writer : BlobWriter
	});
};
ZipDirectoryEntryProto.addData64URI = function(name, dataURI) {
	return addChild(this, name, {
		data : dataURI,
		Reader : Data64URIReader,
		Writer : Data64URIWriter
	});
};
ZipDirectoryEntryProto.addFileEntry = function(fileEntry, onend, onerror) {
	addFileEntry(this, fileEntry, onend, onerror);
};
ZipDirectoryEntryProto.addData = function(name, params) {
	return addChild(this, name, params);
};
ZipDirectoryEntryProto.importBlob = function(blob, onend, onerror) {
	this.importZip(new BlobReader(blob), onend, onerror);
};
ZipDirectoryEntryProto.importText = function(text, onend, onerror) {
	this.importZip(new TextReader(text), onend, onerror);
};
ZipDirectoryEntryProto.importData64URI = function(dataURI, onend, onerror) {
	this.importZip(new Data64URIReader(dataURI), onend, onerror);
};
ZipDirectoryEntryProto.exportBlob = function(onend, onprogress, onerror) {
	this.exportZip(new BlobWriter("application/zip"), onend, onprogress, onerror);
};
ZipDirectoryEntryProto.exportText = function(onend, onprogress, onerror) {
	this.exportZip(new TextWriter(), onend, onprogress, onerror);
};
ZipDirectoryEntryProto.exportFileEntry = function(fileEntry, onend, onprogress, onerror) {
	this.exportZip(new zip.FileWriter(fileEntry, "application/zip"), onend, onprogress, onerror);
};
ZipDirectoryEntryProto.exportData64URI = function(onend, onprogress, onerror) {
	this.exportZip(new Data64URIWriter("application/zip"), onend, onprogress, onerror);
};
ZipDirectoryEntryProto.importZip = function(reader, onend, onerror) {
	var that = this;
	createReader(reader, function(zipReader) {
		zipReader.getEntries(function(entries) {
			entries.forEach(function(entry) {
				var parent = that, path = entry.filename.split("/"), name = path.pop();
				path.forEach(function(pathPart) {
					parent = parent.getChildByName(pathPart) || new ZipDirectoryEntry(that.fs, pathPart, null, parent);
				});
				if (!entry.directory)
					addChild(parent, name, {
						data : entry,
						Reader : ZipBlobReader
					});
			});
			onend();
		});
	}, onerror);
};
ZipDirectoryEntryProto.exportZip = function(writer, onend, onprogress, onerror) {
	var that = this;
	initReaders(that, function() {
		createWriter(writer, function(zipWriter) {
			exportZip(zipWriter, that, function() {
				zipWriter.close(onend);
			}, onprogress, getTotalSize(that));
		}, onerror);
	}, onerror);
};
ZipDirectoryEntryProto.getChildByName = function(name) {
	var childIndex, child, that = this;
	for (childIndex = 0; childIndex < that.children.length; childIndex++) {
		child = that.children[childIndex];
		if (child.name == name)
			return child;
	}
};

function FS() {
	resetFS(this);
}
FS.prototype = {
	remove : function(entry) {
		detach(entry);
		this.entries[entry.id] = null;
	},
	find : function(fullname) {
		var index, path = fullname.split("/"), node = this.root;
		for (index = 0; node && index < path.length; index++)
			node = node.getChildByName(path[index]);
		return node;
	},
	getById : function(id) {
		return this.entries[id];
	},
	importBlob : function(blob, onend, onerror) {
		resetFS(this);
		this.root.importBlob(blob, onend, onerror);
	},
	importText : function(text, onend, onerror) {
		resetFS(this);
		this.root.importText(text, onend, onerror);
	},
	importData64URI : function(dataURI, onend, onerror) {
		resetFS(this);
		this.root.importData64URI(dataURI, onend, onerror);
	},
	exportBlob : function(onend, onprogress, onerror) {
		this.root.exportBlob(onend, onprogress, onerror);
	},
	exportText : function(onend, onprogress, onerror) {
		this.root.exportText(onend, onprogress, onerror);
	},
	exportFileEntry : function(fileEntry, onend, onprogress, onerror) {
		this.root.exportFileEntry(fileEntry, onend, onprogress, onerror);
	},
	exportData64URI : function(onend, onprogress, onerror) {
		this.root.exportData64URI(onend, onprogress, onerror);
	}
};

zip.fs = {
	FS : FS,
	ZipDirectoryEntry : ZipDirectoryEntry,
	ZipFileEntry : ZipFileEntry
};

zip.getMimeType = function() {
	return "application/octet-stream";
};