// This file is part of Moodle - http://moodle.org/
//
// Moodle 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 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 Moodle.  If not, see <http://www.gnu.org/licenses/>.

/* eslint space-before-function-paren: 0 */

/**
 * Load the format_tiles JavaScript for the course edit settings page /course/edit.php?id=xxx
 *
 * @module      format_tiles/completion
 * @copyright   2018 David Watson {@link http://evolutioncode.uk}
 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define(["jquery", "core/templates", "core/config", "core/ajax", "core/str", "core_course/manual_completion_toggle"],
    function ($, Templates, config, ajax, str, coreManualCompletion) {
        "use strict";

        var courseId;

        const Selector = {
            pageContent: "#page-content",
            regionMain: "#region-main",
            resourceModule: '.activity.resource',
            completeonevent: ".completeonevent",
            activity: "li.activity",
            section: "li.section.main",
            toggleCompletionSubtile: '[data-action="tiles-toggle-manual-completion-subtile"]',
            tileNumber: "#tile-",
            progressIndicatorSecNumber: '#tileprogress-',
            tile: '.tile',
            spacer: '.spacer',
            availabilityinfo: '.availabilityinfo',
            sectionId: '#section-'
        };

        const isRTL = $('html').css('direction') === 'rtl';

        /**
         * Set new values for a given progress indicator to the element in the DOM.
         * @param {number} sectionNumber
         * @param {number} numComplete
         * @param {number} numOutOf
         */
        const setProgressIndicator = function(sectionNumber, numComplete, numOutOf) {
            if (!numOutOf || numComplete < 0) {
                // If we are already at zero, do not reduce.  May happen rarely if user presses repeatedly.
                // Will not cause a long term issue as will be resolved when user refreshes page.
                return;
            }
            const tileProgressIndicator = $('#tileprogress-' + sectionNumber);
            if (tileProgressIndicator.length) {
                const percent = numOutOf > 0 ? Math.round(numComplete / numOutOf * 100) : 0;
                tileProgressIndicator.attr('data-numcomplete', numComplete);
                tileProgressIndicator.attr('data-numoutof', numOutOf);
                tileProgressIndicator.find('.num-complete').html(numComplete);
                tileProgressIndicator.find('.num-out-of').html(numOutOf);
                tileProgressIndicator.find('.percent-complete').html(percent);

                // If we have an SVG radial progress indicator, change it.
                tileProgressIndicator.find('svg circle.partial')
                    .attr(
                        'stroke-dashoffset',
                        numOutOf > 0 ? Math.round(((numOutOf - numComplete) / numOutOf) * 106.8) : 0
                    );
                const svgX = isRTL ? (percent < 10 ? 25 : 30) : (percent < 10 ? 15 : 10);
                tileProgressIndicator.find('svg text')
                    .html(percent)
                    .attr('x', svgX);

                str.get_strings([{
                    key: "progresstitle",
                    component: "format_tiles",
                    param: {
                        numOutOf: numOutOf, numComplete: numComplete, percent: percent
                    }
                }]).done(function (s) {
                    tileProgressIndicator.prop('title', s[0]);
                    $('#tile-' + sectionNumber).find('.completion-bar')
                        .css('width', `${percent}%`)
                        .attr('title', s[0]);
                });

                if (sectionNumber === 0) {
                    const overallProgressOuter = $('#tiles-overall-progress-outer');
                    if (percent === 100) {
                        overallProgressOuter.addClass('is-complete');
                    } else {
                        overallProgressOuter.removeClass('is-complete');
                    }
                }
            }
        };

        /**
         * Trigger an event so that other JS modules can be notified to check completion status.
         * Used to refresh section contents when completion is checked.
         * Can also be used by other components e.g. blocks that show completion.
         * @param {number} sectionNum the number of the section where completion changed.
         * @param {number} cmId the course module where completion changed.
         */
        const triggerCompletionChangedEvent = function (sectionNum, cmId) {
            if (sectionNum > 0 || cmId > 0) {
                const data = {courseid: courseId, section: sectionNum, cmid: cmId};
                $(document).trigger('format-tiles-completion-changed', data);
            }
        };

        /**
         * If we have called format_tiles_get_section_information then we need to add the result to the DOM.
         * @param {array} sections the section in
         * @param {number} overallcomplete how many activities complete in the section overall
         * @param {number} overalloutof how many activities in the section overall
         */
        const updateSectionsInfo = function(sections, overallcomplete, overalloutof) {
            sections.forEach(sec => {
                if (sec.sectionnum > 0) {
                    const tile = $(Selector.tileNumber + sec.sectionnum);
                    // If this tile is now unrestricted / visible, give it the right classes.
                    if (sec.isavailable && tile.hasClass('tile-restricted')) {
                        tile.removeClass('tile-restricted');
                    } else if (!sec.isavailable) {
                        tile.addClass('tile-restricted');
                    }
                    if (sec.isclickable && !tile.hasClass('tile-clickable')) {
                        tile.addClass('tile-clickable');
                    } else if (!sec.isclickable && tile.hasClass('tile-clickable')) {
                        tile.removeClass('tile-clickable');
                    }
                    if (sec.iscomplete) {
                        tile.addClass('is-complete');
                    } else {
                        tile.removeClass('is-complete');
                    }

                    // There may not be a progress indicator e.g. if tile contains no trackable activities.
                    setProgressIndicator(sec.sectionnum, sec.numcomplete, sec.numoutof);

                    // Finally change or re-render the availability message if necessary.
                    const availabilityInfoDiv = tile.find(Selector.availabilityinfo);
                    if (availabilityInfoDiv.length > 0 && sec.isavailable && !sec.availabilitymessage) {
                        // Display no message any more.
                        availabilityInfoDiv.fadeOut();
                    } else if (!sec.isavailable && sec.availabilitymessage) {
                        // Sec is not available and we have a message to display.
                        if (availabilityInfoDiv.length > 0) {
                            availabilityInfoDiv.html = sec.availabilitymessage;
                            availabilityInfoDiv.fadeIn();
                        } else {
                            Templates.render("format_tiles/availability_info", {
                                availabilitymessage: sec.availabilitymessage,
                                visible: true
                            }).done(function (html) {
                                // Need to repeat jquery selector as it is being replaced (replacwith).
                                $('tile-' + sec.section).find('.availabilityinfo').replaceWith(html);
                            });
                        }
                    }
                }
            });
            setProgressIndicator(0, overallcomplete, overalloutof);
        };

        /**
         * Sometimes we must check the availability and completion status of/some all tiles using AJAX.
         * This might happen if for example a tile expands and some embedded activities are then complete.
         * Other tiles might use the completion of a previous tile for their availability.
         * This especially applies if teh H5P filter is being used to display embedded H5P in labels.
         * @param {Number[]} sectionNums
         */
        var updateTileInformation = function (sectionNums) {
            if (sectionNums === undefined) {
                // Use all sections if no arg.
                sectionNums = $(Selector.tile).not(Selector.spacer).map((i, t) => {
                    return $(t).data('section');
                }).toArray();
            }
            ajax.call([{
                methodname: "format_tiles_get_section_information",
                args: {
                    courseid: courseId,
                    sectionnums: sectionNums
                }
            }])[0].done((res) => {
                    updateSectionsInfo(res.sections, res.overall.complete, res.overall.outof);
                })
                .fail(err => {
                    require(["core/log"], function(log) {
                        log.debug(
                            "Failed to get section information to check completion status of section"
                        );
                        log.debug(err);
                    });
                });
        };

        return {
            init: function (courseIdInit) {
                courseId = courseIdInit;
                $(document).ready(function () {
                    var loadingString = '...';
                    str.get_strings([{key: "loading", component: "format_tiles"}]).done(function (s) {
                        loadingString = s[0] + '  ...';
                    });
                    // Included like this so that later dynamically added boxes are covered.
                    // We only need to handle this here for subtiles.
                    // Regular course modules use data-action="toggle-manual-completion" instead which triggers core.
                    $("body").on("click", Selector.toggleCompletionSubtile, function (e) {
                        // If this is a subtile, replace button with a spinner pending reload of activities over JS.
                        // Otherwise the core JS will replace with its own with different style.
                        // See core_course/manual_completion_toggle.
                        const currentTarget = $(e.currentTarget);
                        const section = currentTarget.closest('li.section');
                        currentTarget.replaceWith(
                            '<span class="completionspinner spinner-grow spinner-grow-sm text-secondary mt-2 me-2"'
                            + ' role="status"><span class="sr-only">' + loadingString + '</span></span>'
                        );
                        const cmId = parseInt(currentTarget.data('cmid'));
                        ajax.call([{
                            methodname: "core_completion_update_activity_completion_status_manually",
                            args: {cmid: cmId, completed: currentTarget.data('complete') !== 1}
                        }])[0].done((res) => {
                            if (res.status === true) {
                                triggerCompletionChangedEvent(section.data('section'), cmId);
                            }
                        });

                        // If this is in a modal header, trigger refresh of the main window completion too.
                        if (currentTarget.closest('.embed-module-buttons').length !== 0) {
                            const cmId = currentTarget.data('cmid');
                            const sectionNum = $('li#module-' + cmId).closest(Selector.section).data('section');
                            triggerCompletionChangedEvent(sectionNum, cmId ? parseInt(cmId) : 0);
                        }
                    });

                    var pageContent = $("#page-content");
                    if (pageContent.length === 0) {
                        // Some themes e.g. RemUI do not have a #page-content div, so use #region-main.
                        pageContent = $("#region-main");
                    }

                    // If an activity with an "onclick" attribute is clicked, this means core is launching an activity pop up.
                    $('li.section a').on('click', function(e) {
                        const target = $(e.target);
                        const isCorePopUp = target.attr('onclick')
                            && target.attr('onclick').indexOf('window.open') === 0;
                        if (isCorePopUp) {
                            const cm = target.closest('li.activity');
                            if (cm.hasClass('completion-view')) {
                                const section = (target.closest('li.section')).data('section');
                                triggerCompletionChangedEvent(section, cm.data('cmid'));
                            }
                        }
                    });

                    // When behat tests are running, for whatever reason core completion is not initialised, so we do it here.
                    coreManualCompletion.init();
                });
            },
            /**
             *
             * @param {number} sectionNum
             * @param {number} cmid
             */
            triggerCompletionChangedEvent: function(sectionNum, cmid) {
                triggerCompletionChangedEvent(sectionNum, cmid);
            },
            updateTileInformation: function(sectionNumbers) {
                try {
                    updateTileInformation(sectionNumbers);
                } catch (err) {
                    require(["core/log"], function(log) {
                        log.debug(err);
                    });
                }
            },
            updateSectionsInfo: function(sections, overallcomplete, overalloutof) {
                updateSectionsInfo(sections, overallcomplete, overalloutof);
            }
        };
    }
);
