<template>
	<modal
		class="edit-news-modal"
		:title="newsId ? 'Edit News' : 'Create News'"
		:size="'wide'"
		:split="true"
	>
		<template #body>
			<div class="left-section">
				<p><strong>Markdown</strong></p>
				<textarea v-model="markdown"></textarea>
			</div>
			<div class="right-section">
				<p><strong>Preview</strong></p>
				<div
					class="news-item"
					id="preview"
					v-html="sanitize(marked(markdown))"
				></div>
			</div>
		</template>
		<template #footer>
			<div>
				<p class="control select">
					<select v-model="status">
						<option value="draft">Draft</option>
						<option value="published" selected>Publish</option>
					</select>
				</p>

				<p class="is-expanded checkbox-control">
					<label class="switch">
						<input
							type="checkbox"
							id="show-to-new-users"
							v-model="showToNewUsers"
						/>
						<span class="slider round"></span>
					</label>

					<label for="show-to-new-users">
						<p>Show to new users</p>
					</label>
				</p>

				<save-button
					ref="saveButton"
					v-if="newsId"
					@clicked="newsId ? update(false) : create(false)"
				/>

				<save-button
					ref="saveAndCloseButton"
					default-message="Save and close"
					@clicked="newsId ? update(true) : create(true)"
				/>
				<div class="right" v-if="createdAt > 0">
					<span>
						By
						<user-id-to-username
							:user-id="createdBy"
							:alt="createdBy"
							:link="true"
						/> </span
					>&nbsp;<span :title="new Date(createdAt)">
						{{
							formatDistance(createdAt, new Date(), {
								addSuffix: true
							})
						}}
					</span>
				</div>
			</div>
		</template>
	</modal>
</template>

<script>
import { mapActions, mapGetters, mapState } from "vuex";
import { marked } from "marked";
import { sanitize } from "dompurify";
import Toast from "toasters";
import { formatDistance } from "date-fns";

import UserIdToUsername from "@/components/UserIdToUsername.vue";
import ws from "@/ws";
import SaveButton from "../SaveButton.vue";
import Modal from "../Modal.vue";

export default {
	components: { Modal, SaveButton, UserIdToUsername },
	props: {
		newsId: { type: String, default: "" },
		sector: { type: String, default: "admin" }
	},
	data() {
		return {
			markdown:
				"# Header\n## Sub-Header\n- **So**\n- _Many_\n- ~Points~\n\nOther things you want to say and [link](https://example.com).\n\n### Sub-Sub-Header\n> Oh look, a quote!\n\n`lil code`\n\n```\nbig code\n```\n",
			status: "published",
			showToNewUsers: false,
			createdBy: null,
			createdAt: 0
		};
	},
	computed: {
		...mapState("modals/editNews", { news: state => state.news }),
		...mapGetters({ socket: "websockets/getSocket" })
	},
	mounted() {
		marked.use({
			renderer: {
				table(header, body) {
					return `<table class="table">
					<thead>${header}</thead>
					<tbody>${body}</tbody>
					</table>`;
				}
			}
		});

		ws.onConnect(this.init);
	},
	methods: {
		init() {
			if (this.newsId) {
				this.socket.dispatch(`news.getNewsFromId`, this.newsId, res => {
					if (res.status === "success") {
						const {
							markdown,
							status,
							showToNewUsers,
							createdBy,
							createdAt
						} = res.data.news;
						this.markdown = markdown;
						this.status = status;
						this.showToNewUsers = showToNewUsers;
						this.createdBy = createdBy;
						this.createdAt = createdAt;
					} else {
						new Toast("News with that ID not found.");
						this.closeModal("editNews");
					}
				});
			}
		},
		marked,
		sanitize,
		getTitle() {
			let title = "";
			const preview = document.getElementById("preview");

			// validate existence of h1 for the page title

			if (preview.childNodes.length === 0) return "";

			if (preview.childNodes[0].tagName !== "H1") {
				for (
					let node = 0;
					node < preview.childNodes.length;
					node += 1
				) {
					if (preview.childNodes[node].tagName) {
						if (preview.childNodes[node].tagName === "H1")
							title = preview.childNodes[node].innerText;

						break;
					}
				}
			} else title = preview.childNodes[0].innerText;

			return title;
		},
		create(close) {
			if (this.markdown === "")
				return new Toast("News item cannot be empty.");

			const title = this.getTitle();
			if (!title)
				return new Toast(
					"Please provide a title (heading level 1) at the top of the document."
				);

			return this.socket.dispatch(
				"news.create",
				{
					title,
					markdown: this.markdown,
					status: this.status,
					showToNewUsers: this.showToNewUsers
				},
				res => {
					new Toast(res.message);
					if (res.status === "success" && close)
						this.closeModal("editNews");
				}
			);
		},
		update(close) {
			if (this.markdown === "")
				return new Toast("News item cannot be empty.");

			const title = this.getTitle();
			if (!title)
				return new Toast(
					"Please provide a title (heading level 1) at the top of the document."
				);

			return this.socket.dispatch(
				"news.update",
				this.newsId,
				{
					title,
					markdown: this.markdown,
					status: this.status,
					showToNewUsers: this.showToNewUsers
				},
				res => {
					new Toast(res.message);
					if (res.status === "success" && close)
						this.closeModal("editNews");
				}
			);
		},
		formatDistance,
		...mapActions("modalVisibility", ["closeModal"]),
		...mapActions("modals/editNews", [
			"editNews",
			"addChange",
			"removeChange"
		])
	}
};
</script>

<style lang="less">
.edit-news-modal .modal-card .modal-card-foot .right {
	column-gap: 5px;
}
</style>

<style lang="less" scoped>
.night-mode {
	.edit-news-modal .modal-card .modal-card-body textarea,
	.edit-news-modal .modal-card .modal-card-body #preview {
		border-color: var(--grey-3);
	}

	.edit-news-modal .modal-card .modal-card-body textarea {
		background-color: var(--dark-grey);
		color: var(--white);
	}
}
.edit-news-modal .modal-card .modal-card-body {
	.left-section,
	.right-section {
		padding: 10px;
	}

	textarea {
		border: 0;
		outline: none;
		resize: none;
		font-size: 16px;
	}

	#preview {
		word-break: break-all;
		overflow: auto;
		box-shadow: 0;
	}

	textarea,
	#preview {
		padding: 5px;
		border: 1px solid var(--light-grey-3) !important;
		border-radius: @border-radius;
		height: calc(100vh - 280px);
		width: 100%;
	}
}

.edit-news-modal .modal-card .modal-card-foot {
	.control {
		margin-bottom: 0 !important;
	}

	.right {
		line-height: 36px;
		column-gap: 0;
	}
}
</style>
