<template>
	<div :class="{ 'is-loading': taskCollectionService.loading}" class="loader-container is-max-width-desktop list-view">
		<div class="filter-container" v-if="list.isSavedFilter && !list.isSavedFilter()">
			<div class="items">
				<div class="search">
					<div :class="{ 'hidden': !showTaskSearch }" class="field has-addons">
						<div class="control has-icons-left has-icons-right">
							<input
								@blur="hideSearchBar()"
								@keyup.enter="searchTasks"
								class="input"
								placeholder="Search"
								type="text"
								v-focus
								v-model="searchTerm"/>
							<span class="icon is-left">
								<icon icon="search"/>
							</span>
						</div>
						<div class="control">
							<button
								:class="{'is-loading': taskCollectionService.loading}"
								@click="searchTasks"
								class="button has-no-shadow is-primary">
								Search
							</button>
						</div>
					</div>
					<button @click="showTaskSearch = !showTaskSearch" class="button" v-if="!showTaskSearch">
						<span class="icon">
							<icon icon="search"/>
						</span>
					</button>
				</div>
				<button @click.prevent.stop="showTaskFilter = !showTaskFilter" class="button">
					<span class="icon is-small">
						<icon icon="filter"/>
					</span>
					Filters
				</button>
			</div>
			<filter-popup
				@change="loadTasks(1)"
				:visible="showTaskFilter"
				v-model="params"
			/>
		</div>

		<div class="field task-add" v-if="!list.isArchived && canWrite && list.id > 0">
			<div class="field is-grouped">
				<p :class="{ 'is-loading': taskService.loading}" class="control has-icons-left is-expanded">
					<input
						:class="{ 'disabled': taskService.loading}"
						@keyup.enter="addTask()"
						class="input"
						placeholder="Add a new task..."
						type="text"
						v-focus
						v-model="newTaskText"/>
					<span class="icon is-small is-left">
						<icon icon="tasks"/>
					</span>
				</p>
				<p class="control">
					<button :disabled="newTaskText.length === 0" @click="addTask()" class="button is-primary">
						<span class="icon is-small">
							<icon icon="plus"/>
						</span>
						Add
					</button>
				</p>
			</div>
			<p class="help is-danger" v-if="showError && newTaskText === ''">
				Please specify a list title.
			</p>
		</div>

		<p class="list-is-empty-notice" v-if="tasks.length === 0">
			This list is currently empty.
		</p>

		<div class="columns">
			<div class="column">
				<div :class="{'short': isTaskEdit}" class="tasks" v-if="tasks && tasks.length > 0">
					<single-task-in-list
						:disabled="!canWrite"
						:key="t.id"
						:the-task="t"
						@taskUpdated="updateTasks"
						task-detail-route="task.detail"
						v-for="t in tasks"
					>
						<div @click="editTask(t.id)" class="icon settings" v-if="!list.isArchived && canWrite">
							<icon icon="pencil-alt"/>
						</div>
					</single-task-in-list>
				</div>
			</div>
			<div class="column is-4" v-if="isTaskEdit">
				<div class="card taskedit">
					<header class="card-header">
						<p class="card-header-title">
							Edit Task
						</p>
						<a @click="isTaskEdit = false" class="card-header-icon">
							<span class="icon">
								<icon icon="angle-right"/>
							</span>
						</a>
					</header>
					<div class="card-content">
						<div class="content">
							<edit-task :task="taskEditTask"/>
						</div>
					</div>
				</div>
			</div>
		</div>

		<nav
			aria-label="pagination"
			class="pagination is-centered"
			role="navigation"
			v-if="taskCollectionService.totalPages > 1">
			<router-link
				:disabled="currentPage === 1"
				:to="getRouteForPagination(currentPage - 1)"
				class="pagination-previous"
				tag="button">
				Previous
			</router-link>
			<router-link
				:disabled="currentPage === taskCollectionService.totalPages"
				:to="getRouteForPagination(currentPage + 1)"
				class="pagination-next"
				tag="button">
				Next page
			</router-link>
			<ul class="pagination-list">
				<template v-for="(p, i) in pages">
					<li :key="'page'+i" v-if="p.isEllipsis"><span class="pagination-ellipsis">&hellip;</span></li>
					<li :key="'page'+i" v-else>
						<router-link
							:aria-label="'Goto page ' + p.number"
							:class="{'is-current': p.number === currentPage}"
							:to="getRouteForPagination(p.number)"
							class="pagination-link">
							{{ p.number }}
						</router-link>
					</li>
				</template>
			</ul>
		</nav>

		<!-- This router view is used to show the task popup while keeping the kanban board itself -->
		<transition name="modal">
			<router-view/>
		</transition>

	</div>
</template>

<script>
import TaskService from '../../../services/task'
import TaskModel from '../../../models/task'
import LabelTaskService from '../../../services/labelTask'
import LabelService from '../../../services/label'
import LabelTask from '../../../models/labelTask'
import LabelModel from '../../../models/label'

import EditTask from '../../../components/tasks/edit-task'
import SingleTaskInList from '../../../components/tasks/partials/singleTaskInList'
import taskList from '../../../components/tasks/mixins/taskList'
import {saveListView} from '@/helpers/saveListView'
import Rights from '../../../models/rights.json'
import {mapState} from 'vuex'
import FilterPopup from '@/components/list/partials/filter-popup'

export default {
	name: 'List',
	data() {
		return {
			taskService: TaskService,
			isTaskEdit: false,
			taskEditTask: TaskModel,
			newTaskText: '',

			showError: false,
			labelTaskService: LabelTaskService,
			labelService: LabelService,
		}
	},
	mixins: [
		taskList,
	],
	components: {
		FilterPopup,
		SingleTaskInList,
		EditTask,
	},
	created() {
		this.taskService = new TaskService()
		this.labelService = new LabelService()
		this.labelTaskService = new LabelTaskService()

		// Save the current list view to local storage
		// We use local storage and not vuex here to make it persistent across reloads.
		saveListView(this.$route.params.listId, this.$route.name)
	},
	computed: mapState({
		canWrite: state => state.currentList.maxRight > Rights.READ,
		list: state => state.currentList,
	}),
	methods: {
		// This function initializes the tasks page and loads the first page of tasks
		initTasks(page, search = '') {
			this.taskEditTask = null
			this.isTaskEdit = false
			this.loadTasks(page, search)
		},
		addTask() {
			if (this.newTaskText === '') {
				this.showError = true
				return
			}
			this.showError = false

			let task = new TaskModel({title: this.newTaskText, listId: this.$route.params.listId})
			this.taskService.create(task)
				.then(task => {
					this.tasks.push(task)
					this.sortTasks()
					this.newTaskText = ''

					// Check if the task has words starting with ~ in the title and make them to labels
					const parts = task.title.split(' ~')
					// The first element will always contain the title, even if there is no occurrence of ~
					if (parts.length > 1) {

						// First, create an unresolved promise for each entry in the array to wait
						// until all labels are added to update the task title once again
						let labelAddings = []
						let labelAddsToWaitFor = []
						parts.forEach((p, index) => {
							if (index < 1) {
								return
							}

							labelAddsToWaitFor.push(new Promise((resolve, reject) => {
								labelAddings.push({resolve: resolve, reject: reject})
							}))
						})

						// Then do everything that is involved in finding, creating and adding the label to the task
						parts.forEach((p, index) => {
							if (index < 1) {
								return
							}

							// The part up until the next space
							const labelTitle = p.split(' ')[0]

							// Don't create an empty label
							if (labelTitle === '') {
								return
							}

							// Check if the label exists
							this.labelService.getAll({}, {s: labelTitle})
								.then(res => {
									// Label found, use it
									if (res.length > 0 && res[0].title === labelTitle) {
										const labelTask = new LabelTask({
											taskId: task.id,
											labelId: res[0].id,
										})
										this.labelTaskService.create(labelTask)
											.then(result => {
												task.labels.push(res[0])

												// Remove the label text from the task title
												task.title = task.title.replace(` ~${labelTitle}`, '')

												// Make the promise done (the one with the index 0 does not exist)
												labelAddings[index - 1].resolve(result)
											})
											.catch(e => {
												this.error(e, this)
											})
									} else {
										// label not found, create it
										const label = new LabelModel({title: labelTitle})
										this.labelService.create(label)
											.then(res => {
												const labelTask = new LabelTask({
													taskId: task.id,
													labelId: res.id,
												})
												this.labelTaskService.create(labelTask)
													.then(result => {
														task.labels.push(res)

														// Remove the label text from the task title
														task.title = task.title.replace(` ~${labelTitle}`, '')

														// Make the promise done (the one with the index 0 does not exist)
														labelAddings[index - 1].resolve(result)
													})
													.catch(e => {
														this.error(e, this)
													})
											})
											.catch(e => {
												this.error(e, this)
											})
									}
								})
								.catch(e => {
									this.error(e, this)
								})
						})

						// This waits to update the task until all labels have been added and the title has
						// been modified to remove each label text
						Promise.all(labelAddsToWaitFor)
							.then(() => {
								this.taskService.update(task)
									.then(updatedTask => {
										this.updateTasks(updatedTask)
									})
									.catch(e => {
										this.error(e, this)
									})
							})
					}
				})
				.catch(e => {
					this.error(e, this)
				})
		},
		editTask(id) {
			// Find the selected task and set it to the current object
			let theTask = this.getTaskById(id) // Somehow this does not work if we directly assign this to this.taskEditTask
			this.taskEditTask = theTask
			this.isTaskEdit = true
		},
		getTaskById(id) {
			for (const t in this.tasks) {
				if (this.tasks[t].id === parseInt(id)) {
					return this.tasks[t]
				}
			}
			return {} // FIXME: This should probably throw something to make it clear to the user noting was found
		},
		updateTasks(updatedTask) {
			for (const t in this.tasks) {
				if (this.tasks[t].id === updatedTask.id) {
					this.$set(this.tasks, t, updatedTask)
					break
				}
			}
			this.sortTasks()
		},
	},
}
</script>