/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2009  Christophe Dumez <chris@qbittorrent.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

'use strict';

if (window.qBittorrent === undefined) {
    window.qBittorrent = {};
}

window.qBittorrent.PropFiles = (function() {
    const exports = function() {
        return {
            normalizePriority: normalizePriority,
            isDownloadCheckboxExists: isDownloadCheckboxExists,
            createDownloadCheckbox: createDownloadCheckbox,
            updateDownloadCheckbox: updateDownloadCheckbox,
            isPriorityComboExists: isPriorityComboExists,
            createPriorityCombo: createPriorityCombo,
            updatePriorityCombo: updatePriorityCombo,
            updateData: updateData,
            collapseIconClicked: collapseIconClicked
        };
    };

    const torrentFilesTable = new window.qBittorrent.DynamicTable.TorrentFilesTable();
    const FilePriority = window.qBittorrent.FileTree.FilePriority;
    const TriState = window.qBittorrent.FileTree.TriState;
    let is_seed = true;
    let current_hash = "";

    const normalizePriority = function(priority) {
        switch (priority) {
            case FilePriority.Ignored:
            case FilePriority.Normal:
            case FilePriority.High:
            case FilePriority.Maximum:
            case FilePriority.Mixed:
                return priority;
            default:
                return FilePriority.Normal;
        }
    };

    const getAllChildren = function(id, fileId) {
        const node = torrentFilesTable.getNode(id);
        if (!node.isFolder) {
            return {
                rowIds: [id],
                fileIds: [fileId]
            };
        }

        const rowIds = [];
        const fileIds = [];

        const getChildFiles = function(node) {
            if (node.isFolder) {
                node.children.each(function(child) {
                    getChildFiles(child);
                });
            }
            else {
                rowIds.push(node.data.rowId);
                fileIds.push(node.data.fileId);
            }
        };

        node.children.each(function(child) {
            getChildFiles(child);
        });

        return {
            rowIds: rowIds,
            fileIds: fileIds
        };
    };

    const fileCheckboxClicked = function(e) {
        e.stopPropagation();

        const checkbox = e.target;
        const priority = checkbox.checked ? FilePriority.Normal : FilePriority.Ignored;
        const id = checkbox.get('data-id');
        const fileId = checkbox.get('data-file-id');

        const rows = getAllChildren(id, fileId);

        setFilePriority(rows.rowIds, rows.fileIds, priority);
        updateGlobalCheckbox();
    };

    const fileComboboxChanged = function(e) {
        const combobox = e.target;
        const priority = combobox.value;
        const id = combobox.get('data-id');
        const fileId = combobox.get('data-file-id');

        const rows = getAllChildren(id, fileId);

        setFilePriority(rows.rowIds, rows.fileIds, priority);
        updateGlobalCheckbox();
    };

    const isDownloadCheckboxExists = function(id) {
        return ($('cbPrio' + id) !== null);
    };

    const createDownloadCheckbox = function(id, fileId, checked) {
        const checkbox = new Element('input');
        checkbox.set('type', 'checkbox');
        checkbox.set('id', 'cbPrio' + id);
        checkbox.set('data-id', id);
        checkbox.set('data-file-id', fileId);
        checkbox.set('class', 'DownloadedCB');
        checkbox.addEvent('click', fileCheckboxClicked);

        updateCheckbox(checkbox, checked);
        return checkbox;
    };

    const updateDownloadCheckbox = function(id, checked) {
        const checkbox = $('cbPrio' + id);
        updateCheckbox(checkbox, checked);
    };

    const updateCheckbox = function(checkbox, checked) {
        switch (checked) {
            case TriState.Checked:
                setCheckboxChecked(checkbox);
                break;
            case TriState.Unchecked:
                setCheckboxUnchecked(checkbox);
                break;
            case TriState.Partial:
                setCheckboxPartial(checkbox);
                break;
        }
    };

    const isPriorityComboExists = function(id) {
        return ($('comboPrio' + id) !== null);
    };

    const createPriorityOptionElement = function(priority, selected, html) {
        const elem = new Element('option');
        elem.set('value', priority.toString());
        elem.set('html', html);
        if (selected)
            elem.setAttribute('selected', '');
        return elem;
    };

    const createPriorityCombo = function(id, fileId, selectedPriority) {
        const select = new Element('select');
        select.set('id', 'comboPrio' + id);
        select.set('data-id', id);
        select.set('data-file-id', fileId);
        select.set('disabled', is_seed);
        select.addClass('combo_priority');
        select.addEvent('change', fileComboboxChanged);

        createPriorityOptionElement(FilePriority.Ignored, (FilePriority.Ignored === selectedPriority), 'QBT_TR(Do not download)QBT_TR[CONTEXT=PropListDelegate]').injectInside(select);
        createPriorityOptionElement(FilePriority.Normal, (FilePriority.Normal === selectedPriority), 'QBT_TR(Normal)QBT_TR[CONTEXT=PropListDelegate]').injectInside(select);
        createPriorityOptionElement(FilePriority.High, (FilePriority.High === selectedPriority), 'QBT_TR(High)QBT_TR[CONTEXT=PropListDelegate]').injectInside(select);
        createPriorityOptionElement(FilePriority.Maximum, (FilePriority.Maximum === selectedPriority), 'QBT_TR(Maximum)QBT_TR[CONTEXT=PropListDelegate]').injectInside(select);

        // "Mixed" priority is for display only; it shouldn't be selectable
        const mixedPriorityOption = createPriorityOptionElement(FilePriority.Mixed, (FilePriority.Mixed === selectedPriority), 'QBT_TR(Mixed)QBT_TR[CONTEXT=PropListDelegate]');
        mixedPriorityOption.set('disabled', true);
        mixedPriorityOption.injectInside(select);

        return select;
    };

    const updatePriorityCombo = function(id, selectedPriority) {
        const combobox = $('comboPrio' + id);

        if (parseInt(combobox.value) !== selectedPriority)
            selectComboboxPriority(combobox, selectedPriority);

        if (combobox.disabled !== is_seed)
            combobox.disabled = is_seed;
    };

    const selectComboboxPriority = function(combobox, priority) {
        const options = combobox.options;
        for (let i = 0; i < options.length; ++i) {
            const option = options[i];
            if (parseInt(option.value) === priority)
                option.setAttribute('selected', '');
            else
                option.removeAttribute('selected');
        }

        combobox.value = priority;
    };

    const switchCheckboxState = function(e) {
        e.stopPropagation();

        const rowIds = [];
        const fileIds = [];
        let priority = FilePriority.Ignored;
        const checkbox = $('tristate_cb');

        if (checkbox.state === "checked") {
            setCheckboxUnchecked(checkbox);
            // set file priority for all checked to Ignored
            torrentFilesTable.getFilteredAndSortedRows().forEach(function(row) {
                const rowId = row.rowId;
                const fileId = row.full_data.fileId;
                const isChecked = (row.full_data.checked === TriState.Checked);
                const isFolder = (fileId === -1);
                if (!isFolder && isChecked) {
                    rowIds.push(rowId);
                    fileIds.push(fileId);
                }
            });
        }
        else {
            setCheckboxChecked(checkbox);
            priority = FilePriority.Normal;
            // set file priority for all unchecked to Normal
            torrentFilesTable.getFilteredAndSortedRows().forEach(function(row) {
                const rowId = row.rowId;
                const fileId = row.full_data.fileId;
                const isUnchecked = (row.full_data.checked === TriState.Unchecked);
                const isFolder = (fileId === -1);
                if (!isFolder && isUnchecked) {
                    rowIds.push(rowId);
                    fileIds.push(fileId);
                }
            });
        }

        if (rowIds.length > 0)
            setFilePriority(rowIds, fileIds, priority);
    };

    const updateGlobalCheckbox = function() {
        const checkbox = $('tristate_cb');
        if (isAllCheckboxesChecked())
            setCheckboxChecked(checkbox);
        else if (isAllCheckboxesUnchecked())
            setCheckboxUnchecked(checkbox);
        else
            setCheckboxPartial(checkbox);
    };

    const setCheckboxChecked = function(checkbox) {
        checkbox.state = "checked";
        checkbox.indeterminate = false;
        checkbox.checked = true;
    };

    const setCheckboxUnchecked = function(checkbox) {
        checkbox.state = "unchecked";
        checkbox.indeterminate = false;
        checkbox.checked = false;
    };

    const setCheckboxPartial = function(checkbox) {
        checkbox.state = "partial";
        checkbox.indeterminate = true;
    };

    const isAllCheckboxesChecked = function() {
        const checkboxes = $$('input.DownloadedCB');
        for (let i = 0; i < checkboxes.length; ++i) {
            if (!checkboxes[i].checked)
                return false;
        }
        return true;
    };

    const isAllCheckboxesUnchecked = function() {
        const checkboxes = $$('input.DownloadedCB');
        for (let i = 0; i < checkboxes.length; ++i) {
            if (checkboxes[i].checked)
                return false;
        }
        return true;
    };

    const setFilePriority = function(ids, fileIds, priority) {
        if (current_hash === "") return;

        clearTimeout(loadTorrentFilesDataTimer);
        new Request({
            url: 'api/v2/torrents/filePrio',
            method: 'post',
            data: {
                'hash': current_hash,
                'id': fileIds.join('|'),
                'priority': priority
            },
            onComplete: function() {
                loadTorrentFilesDataTimer = loadTorrentFilesData.delay(1000);
            }
        }).send();

        const ignore = (priority === FilePriority.Ignored);
        ids.forEach(function(_id) {
            torrentFilesTable.setIgnored(_id, ignore);

            const combobox = $('comboPrio' + _id);
            if (combobox !== null)
                selectComboboxPriority(combobox, priority);
        });

        torrentFilesTable.updateTable(false);
    };

    let loadTorrentFilesDataTimer;
    const loadTorrentFilesData = function() {
        if ($('prop_files').hasClass('invisible')
            || $('propertiesPanel_collapseToggle').hasClass('panel-expand')) {
            // Tab changed, don't do anything
            return;
        }
        const new_hash = torrentsTable.getCurrentTorrentHash();
        if (new_hash === "") {
            torrentFilesTable.clear();
            clearTimeout(loadTorrentFilesDataTimer);
            loadTorrentFilesDataTimer = loadTorrentFilesData.delay(5000);
            return;
        }
        let loadedNewTorrent = false;
        if (new_hash != current_hash) {
            torrentFilesTable.clear();
            current_hash = new_hash;
            loadedNewTorrent = true;
        }
        const url = new URI('api/v2/torrents/files?hash=' + current_hash);
        new Request.JSON({
            url: url,
            noCache: true,
            method: 'get',
            onComplete: function() {
                clearTimeout(loadTorrentFilesDataTimer);
                loadTorrentFilesDataTimer = loadTorrentFilesData.delay(5000);
            },
            onSuccess: function(files) {
                clearTimeout(torrentFilesFilterInputTimer);

                if (files.length === 0) {
                    torrentFilesTable.clear();
                }
                else {
                    handleNewTorrentFiles(files);
                    if (loadedNewTorrent)
                        collapseAllNodes();
                }
            }
        }).send();
    };

    const updateData = function() {
        clearTimeout(loadTorrentFilesDataTimer);
        loadTorrentFilesData();
    };

    const handleNewTorrentFiles = function(files) {
        is_seed = (files.length > 0) ? files[0].is_seed : true;

        const rows = files.map(function(file, index) {
            let progress = (file.progress * 100).round(1);
            if ((progress === 100) && (file.progress < 1))
                progress = 99.9;

            const ignore = (file.priority === FilePriority.Ignored);
            const checked = (ignore ? TriState.Unchecked : TriState.Checked);
            const remaining = (ignore ? 0 : (file.size * (1.0 - file.progress)));
            const row = {
                fileId: index,
                checked: checked,
                fileName: file.name,
                name: window.qBittorrent.Filesystem.fileName(file.name),
                size: file.size,
                progress: progress,
                priority: normalizePriority(file.priority),
                remaining: remaining,
                availability: file.availability
            };

            return row;
        });

        addRowsToTable(rows);
        updateGlobalCheckbox();
    };

    const addRowsToTable = function(rows) {
        const selectedFiles = torrentFilesTable.selectedRowsIds();
        let rowId = 0;

        const rootNode = new window.qBittorrent.FileTree.FolderNode();

        rows.forEach(function(row) {
            let parent = rootNode;
            const pathFolders = row.fileName.split(window.qBittorrent.Filesystem.PathSeparator);
            pathFolders.pop();
            pathFolders.forEach(function(folderName) {
                if (folderName === '.unwanted')
                    return;

                let parentNode = null;
                if (parent.children !== null) {
                    for (let i = 0; i < parent.children.length; ++i) {
                        const childFolder = parent.children[i];
                        if (childFolder.name === folderName) {
                            parentNode = childFolder;
                            break;
                        }
                    }
                }
                if (parentNode === null) {
                    parentNode = new window.qBittorrent.FileTree.FolderNode();
                    parentNode.name = folderName;
                    parentNode.rowId = rowId;
                    parentNode.root = parent;
                    parent.addChild(parentNode);

                    ++rowId;
                }

                parent = parentNode;
            });

            const isChecked = row.checked ? TriState.Checked : TriState.Unchecked;
            const remaining = (row.priority === FilePriority.Ignored) ? 0 : row.remaining;
            const childNode = new window.qBittorrent.FileTree.FileNode();
            childNode.name = row.name;
            childNode.rowId = rowId;
            childNode.size = row.size;
            childNode.checked = isChecked;
            childNode.remaining = remaining;
            childNode.progress = row.progress;
            childNode.priority = row.priority;
            childNode.availability = row.availability;
            childNode.root = parent;
            childNode.data = row;
            parent.addChild(childNode);

            ++rowId;
        }.bind(this));

        torrentFilesTable.populateTable(rootNode);
        torrentFilesTable.updateTable(false);
        torrentFilesTable.altRow();

        if (selectedFiles.length > 0)
            torrentFilesTable.reselectRows(selectedFiles);
    };

    const collapseIconClicked = function(event) {
        const id = event.get("data-id");
        const node = torrentFilesTable.getNode(id);
        const isCollapsed = (event.parentElement.get("data-collapsed") === "true");

        if (isCollapsed)
            expandNode(node);
        else
            collapseNode(node);
    };

    const filesPriorityMenuClicked = function(priority) {
        const selectedRows = torrentFilesTable.selectedRowsIds();
        if (selectedRows.length === 0) return;

        const rowIds = [];
        const fileIds = [];
        selectedRows.forEach(function(rowId) {
            const elem = $('comboPrio' + rowId);
            rowIds.push(rowId);
            fileIds.push(elem.get("data-file-id"));
        });

        const uniqueRowIds = {};
        const uniqueFileIds = {};
        for (let i = 0; i < rowIds.length; ++i) {
            const rows = getAllChildren(rowIds[i], fileIds[i]);
            rows.rowIds.forEach(function(rowId) {
                uniqueRowIds[rowId] = true;
            });
            rows.fileIds.forEach(function(fileId) {
                uniqueFileIds[fileId] = true;
            });
        }

        setFilePriority(Object.keys(uniqueRowIds), Object.keys(uniqueFileIds), priority);
    };

    const torrentFilesContextMenu = new window.qBittorrent.ContextMenu.ContextMenu({
        targets: '#torrentFilesTableDiv tr',
        menu: 'torrentFilesMenu',
        actions: {
            Rename: function(element, ref) {
                const hash = torrentsTable.getCurrentTorrentHash();
                if (!hash) return;
                const rowId = torrentFilesTable.selectedRowsIds()[0];
                if (rowId === undefined) return;
                const row = torrentFilesTable.rows[rowId];
                if (!row) return;
                const node = torrentFilesTable.getNode(rowId);
                if (node.isFolder) return;

                const name = row.full_data.name;
                const fileId = row.full_data.fileId;

                new MochaUI.Window({
                    id: 'renamePage',
                    title: "QBT_TR(Renaming)QBT_TR[CONTEXT=TorrentContentTreeView]",
                    loadMethod: 'iframe',
                    contentURL: 'rename_file.html?hash=' + hash + '&id=' + fileId + '&name=' + encodeURIComponent(name),
                    scrollbars: false,
                    resizable: false,
                    maximizable: false,
                    paddingVertical: 0,
                    paddingHorizontal: 0,
                    width: 250,
                    height: 100
                });
            },

            FilePrioIgnore: function(element, ref) {
                filesPriorityMenuClicked(FilePriority.Ignored);
            },
            FilePrioNormal: function(element, ref) {
                filesPriorityMenuClicked(FilePriority.Normal);
            },
            FilePrioHigh: function(element, ref) {
                filesPriorityMenuClicked(FilePriority.High);
            },
            FilePrioMaximum: function(element, ref) {
                filesPriorityMenuClicked(FilePriority.Maximum);
            }
        },
        offsets: {
            x: -15,
            y: 2
        },
        onShow: function() {
            if (is_seed)
                this.hideItem('FilePrio');
            else
                this.showItem('FilePrio');

            const rowId = torrentFilesTable.selectedRowsIds()[0];
            const node = torrentFilesTable.getNode(rowId);
            if (node.isFolder)
                this.hideItem('Rename');
            else
                this.showItem('Rename');
        }
    });

    torrentFilesTable.setup('torrentFilesTableDiv', 'torrentFilesTableFixedHeaderDiv', torrentFilesContextMenu);
    // inject checkbox into table header
    const tableHeaders = $$('#torrentFilesTableFixedHeaderDiv .dynamicTableHeader th');
    if (tableHeaders.length > 0) {
        const checkbox = new Element('input');
        checkbox.set('type', 'checkbox');
        checkbox.set('id', 'tristate_cb');
        checkbox.addEvent('click', switchCheckboxState);

        const checkboxTH = tableHeaders[0];
        checkbox.injectInside(checkboxTH);
    }

    // default sort by name column
    if (torrentFilesTable.getSortedColumn() === null)
        torrentFilesTable.setSortedColumn('name');

    let prevTorrentFilesFilterValue;
    let torrentFilesFilterInputTimer = null;
    // listen for changes to torrentFilesFilterInput
    $('torrentFilesFilterInput').addEvent('input', function() {
        const value = $('torrentFilesFilterInput').get("value");
        if (value !== prevTorrentFilesFilterValue) {
            prevTorrentFilesFilterValue = value;
            torrentFilesTable.setFilter(value);
            clearTimeout(torrentFilesFilterInputTimer);
            torrentFilesFilterInputTimer = setTimeout(function() {
                if (current_hash === "") return;
                torrentFilesTable.updateTable(false);

                if (value.trim() === "")
                    collapseAllNodes();
                else
                    expandAllNodes();
            }, 400);
        }
    });

    /**
     * Show/hide a node's row
     */
    const _hideNode = function(node, shouldHide) {
        const span = $('filesTablefileName' + node.rowId);
        // span won't exist if row has been filtered out
        if (span === null)
            return;
        const rowElem = span.parentElement.parentElement;
        if (shouldHide)
            rowElem.addClass("invisible");
        else
            rowElem.removeClass("invisible");
    };

    /**
     * Update a node's collapsed state and icon
     */
    const _updateNodeState = function(node, isCollapsed) {
        const span = $('filesTablefileName' + node.rowId);
        // span won't exist if row has been filtered out
        if (span === null)
            return;
        const td = span.parentElement;

        // store collapsed state
        td.set("data-collapsed", isCollapsed);

        // rotate the collapse icon
        const collapseIcon = td.getElementsByClassName("filesTableCollapseIcon")[0];
        if (isCollapsed)
            collapseIcon.addClass("rotate");
        else
            collapseIcon.removeClass("rotate");
    };

    const _isCollapsed = function(node) {
        const span = $('filesTablefileName' + node.rowId);
        if (span === null)
            return true;

        const td = span.parentElement;
        return (td.get("data-collapsed") === "true");
    };

    const expandNode = function(node) {
        _collapseNode(node, false, false, false);
        torrentFilesTable.altRow();
    };

    const collapseNode = function(node) {
        _collapseNode(node, true, false, false);
        torrentFilesTable.altRow();
    };

    const expandAllNodes = function() {
        const root = torrentFilesTable.getRoot();
        root.children.each(function(node) {
            node.children.each(function(child) {
                _collapseNode(child, false, true, false);
            });
        });
        torrentFilesTable.altRow();
    };

    const collapseAllNodes = function() {
        const root = torrentFilesTable.getRoot();
        root.children.each(function(node) {
            node.children.each(function(child) {
                _collapseNode(child, true, true, false);
            });
        });
        torrentFilesTable.altRow();
    };

    /**
     * Collapses a folder node with the option to recursively collapse all children
     * @param {FolderNode} node the node to collapse/expand
     * @param {boolean} shouldCollapse true if the node should be collapsed, false if it should be expanded
     * @param {boolean} applyToChildren true if the node's children should also be collapsed, recursively
     * @param {boolean} isChildNode true if the current node is a child of the original node we collapsed/expanded
     */
    const _collapseNode = function(node, shouldCollapse, applyToChildren, isChildNode) {
        if (!node.isFolder)
            return;

        const shouldExpand = !shouldCollapse;
        const isNodeCollapsed = _isCollapsed(node);
        const nodeInCorrectState = ((shouldCollapse && isNodeCollapsed) || (shouldExpand && !isNodeCollapsed));
        const canSkipNode = (isChildNode && (!applyToChildren || nodeInCorrectState));
        if (!isChildNode || applyToChildren || !canSkipNode)
            _updateNodeState(node, shouldCollapse);

        node.children.each(function(child) {
            _hideNode(child, shouldCollapse);

            if (!child.isFolder)
                return;

            // don't expand children that have been independently collapsed, unless applyToChildren is true
            const shouldExpandChildren = (shouldExpand && applyToChildren);
            const isChildCollapsed = _isCollapsed(child);
            if (!shouldExpandChildren && isChildCollapsed)
                return;

            _collapseNode(child, shouldCollapse, applyToChildren, true);
        });
    };

    return exports();
})();
