<?php
// This file is part of the Studyplan plugin for Moodle
//
// 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 <https://www.gnu.org/licenses/>.
/**
 * View study plans - teacher view and student view
 * @package    local_treestudyplan
 * @copyright  2023 P.M. Kuipers
 * @license    https://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once("../../config.php");

use local_treestudyplan\contextinfo;
use local_treestudyplan\courseservice;

require_once($CFG->libdir.'/weblib.php');

$systemcontext = context_system::instance();

$PAGE->set_url("/local/treestudyplan/view-plan.php", []);
require_login();

// Figure out the context (category or system, based on either category or context parameter).
$categoryid = optional_param('categoryid', 0, PARAM_INT); // Category id.
$contextid = optional_param('contextid', 0, PARAM_INT); // Context id.
if ($categoryid > 0) {
    $studyplancontext = context_coursecat::instance($categoryid);

} else if ($contextid > 0) {
    $studyplancontext = context::instance_by_id($contextid);
    if (in_array($studyplancontext->contextlevel, [CONTEXT_SYSTEM, CONTEXT_COURSECAT])) {
        $categoryid = $studyplancontext->instanceid;
    } else {
        $studyplancontext = $systemcontext;
    }
} else {
    // If no context is selected, find the first available one.
    $availablecontexts = courseservice::list_available_categories("view");
    $contextid = 1; // Fallback to system context.
    foreach ($availablecontexts as $ctx) {
        if ($ctx["studyplancount"] > 0) {
            $contextid = $ctx["context_id"];
            break;
        }
    }
    // Reload page with selected category.
    $url = new \moodle_url('/local/treestudyplan/view-plan.php', ["contextid" => $contextid]);
    header('Location: '.$url->out(false), true, 302);
    exit;
}

$ci = new contextinfo($studyplancontext);
$contextname = $ci->pathstr();

$PAGE->set_pagelayout('base');
$PAGE->set_title(get_string('view_plan', 'local_treestudyplan')." - ".$contextname);
$PAGE->set_heading(get_string('view_plan', 'local_treestudyplan')." - ".$contextname);

if ($studyplancontext->id > 1) {
    navigation_node::override_active_url(new moodle_url('/course/index.php', ['categoryid' => $categoryid ]));
    $PAGE->navbar->add(get_string('view_plan', 'local_treestudyplan'));

    // Coursecat context.
    $cat = \core_course_category::get($studyplancontext->instanceid, IGNORE_MISSING, true); // We checck visibility later.
} else {
    // System context.
    $cat = \core_course_category::top();
}

if (!$cat->is_uservisible()) {
    throw new \moodle_exception(
        "error:cannotviewcategory",
        "local_treestudyplan",
        "/local/treestudyplan/view_plan.php",
        $contextname
    );
}

if (!has_capability('local/treestudyplan:viewuserreports', $studyplancontext)) {
    throw new \moodle_exception(
        "error:nostudyplanviewaccess",
        "local_treestudyplan",
        "/local/treestudyplan/view_plan.php",
        $contextname
    );
}

// Load javascripts and specific css.
$PAGE->requires->css(new moodle_url($CFG->wwwroot.'/local/treestudyplan/css/bootstrap-vue/bootstrap-vue.css'));
if ($CFG->debugdeveloper) {
    $PAGE->requires->css(new moodle_url($CFG->wwwroot.'/local/treestudyplan/css/devstyles.css'));
}
$PAGE->requires->js_call_amd('local_treestudyplan/page-view-plan', 'init', [$studyplancontext->id, $categoryid]);

/**
 * Shortcut function to provide translations
 *
 * @param mixed $str Translation key
 * @param null|string[] $param Parameters to pass to translation
 * @param string $plugin Location to search for translation strings
 * @return string Translation of key
 */
function t($str, $param = null, $plugin = 'local_treestudyplan') {
    print get_string($str, $plugin, $param);
}

print $OUTPUT->header();
$text = (object)[
    'loading' => t("loading", null, "core"),
    'back' => t('back'),
    'studyplan_select' => t("studyplan_select"),
    'selectstudent_btn' => t('selectstudent_btn'),
    'showoverview' => t("showoverview"),
    'studyplan_noneselected' => t("studyplan_noneselected"),
];
print <<<END
<div id='root'>
    <div class='vue-loader' v-show='false'>
        <div class="spinner-border text-primary" role="status">
            <span class="sr-only">Loading...</span>
        </div>
    </div>
    <div v-cloak>
        <div v-if='!activestudyplan && usedcontexts' class='ml-3 mb-3 s-context-selector'>
            <b-form-select text='{$contextname}' :value="contextid" @change='switchContext'
                :class="(!(usedcontexts.length)) ? 'text-primary' : ''">
                <b-form-select-option v-if='!(usedcontexts.length)' :value="contextid"
                    :class="'text-primary'">
                    <span>{$text->loading}...</span></b-form-select-option>
                <b-form-select-option v-for='ctx in usedcontexts' :key='ctx.id' :value="ctx.context_id"
                    :class="(ctx.studyplancount > 0) ? 'font-weight-bold' : ''"
                ><span v-for="(p, i) in ctx.category.path"><span v-if="i>0"> / </span>{{ p }}</span>
                 <span>({{ ctx.studyplancount }})</span></b-form-select-option>
            </b-form-select>
            <div v-if="!(usedcontexts.length)"
                style="position: relative; top: 0.3rem; width: 1.2rem; height: 1.2rem; font-size: 0.7rem;"
                class="spinner-border text-primary" role="status"></div>
        </div>
        <h3 v-else>{$contextname}</h3>
        <div class="m-buttonbar" style="margin-bottom: 1em;">
            <template v-if="displayedstudyplan">
                <a href='#' @click.prevent='closeStudyplan'
                    ><i style='font-size: 150%;' class='fa fa-chevron-left'></i> {$text->back}</a>
                <span>{$text->studyplan_select}</span>&nbsp;
                <b-form-select lazy :text='dropdown_title' :value='displayedstudyplan.id'>
                    <b-form-select-option
                        v-for='(studyplan, planindex) in studyplans'
                        :key='studyplan.id'
                        @click='selectStudyplan(studyplan)'
                        :value='studyplan.id'
                        >{{ studyplan.name }}</b-form-select-option>
                </b-form-select>&nbsp;
                <s-studyplan-details
                    v-model="displayedstudyplan"
                    v-if="displayedstudyplan.description"
                ></s-studyplan-details>
                <div class="flex-grow-1"><!-- Spacer to align student selector right --></div>
                <div>
                    <span><?php t('selectstudent_btn') ?></span>
                    <s-prevnext-selector
                        :options="associatedstudents"
                        title="firstname"
                        v-model="selectedstudent"
                        defaultselectable
                        grouped
                        optionsfield='users'
                        arrows
                        @change="showStudentView"
                        class="ml-2"
                        variant="primary"
                        >
                        <template v-slot="{value}">{{value.firstname}} {{value.lastname}}</template>
                        <template #defaultlabel><span class='text-primary'>{$text->showoverview}</span></template>
                    </s-prevnext-selector>
                </div>
            </template>
        </div>
        <div class='t-studyplan-container'>
            <h2 v-if='displayedstudyplan&& selectedstudent'
                >{{selectedstudent.firstname}} {{selectedstudent.lastname}} - {{displayedstudyplan.name}}</h2>
            <h2 v-else-if='displayedstudyplan'>{$text->showoverview} - {{displayedstudyplan.name}}</h2>
            <r-studyplan v-if='!loadingstudyplan && displayedstudyplan'
                         v-model='displayedstudyplan' :teachermode='!selectedstudent'
                ></r-studyplan>
            <div v-else-if='loadingstudyplan' class="spinner-border text-primary" role="status">
                <span class="sr-only">Loading...</span>
            </div>
            <div v-else class='t-studyplan-notselected'>
                <p>{$text->studyplan_noneselected}</p>
                <b-card-group deck>
                    <s-studyplan-card
                        v-for='(studyplan, planindex) in studyplans'
                        :key='studyplan.id'
                        v-model='studyplans[planindex]'
                        open
                        @open='selectStudyplan(studyplan)'
                        ></s-studyplan-card>
                </b-card-group>
            </div>
        </div>
    </div>
</div>
END;

print $OUTPUT->footer();