<template>
	<Subtitle value="Documents" />
	<Subtitle :value="patient_info.name" />
	<div class="row">
		<div class="selector col-12" :class="{ 'col-xl-4': selection }">
			<div class="card mb-3 shadow">
				<div class="card-header d-flex justify-content-between align-items-center">
					<span><template v-if="resultset.length > 0">{{resultset.length}}<template v-if="has_more">+</template></template><template v-else-if="is_loading">Loading</template><template v-else>No</template> record{{resultset.length == 1 ? '' : 's'}}</span>
					<router-link :to="'/patient/' + patient_dfn + '/document/new'">
						<svg xmlns="http://www.w3.org/2000/svg" fill="currentColor" viewBox="0 0 16 16" style="width: 1.25em; height: 1.25em; vertical-align: text-bottom;">
							<path d="M14 1a1 1 0 0 1 1 1v12a1 1 0 0 1-1 1H2a1 1 0 0 1-1-1V2a1 1 0 0 1 1-1h12zM2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2z"/>
							<path d="M8 4a.5.5 0 0 1 .5.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3A.5.5 0 0 1 8 4z"/>
						</svg>
					</router-link>
				</div>
				<ul class="scroller list-group list-group-flush" :class="{ 'list-skinny': selection }" ref="scroller">
					<router-link v-for="item in resultset" :to="'/patient/' + patient_dfn + '/document/' + item.IEN" replace custom v-slot="{ navigate, href }">
						<li :key="item" class="record list-group-item" :class="{ 'active': selection == item.IEN }" :title="datetimestring(strptime_vista(item.time)) + '\n' + item.title + '\n' + item.location + '\n' + item.author.byline" @click="navigate">
							<div class="row">
								<div class="cell col-4"><router-link :to="href" replace>{{datestring(strptime_vista(item.time))}}</router-link></div>
								<div class="cell col-8"><template v-if="item.status == 'unsigned'">✱</template>{{item.title}}</div>
								<div class="cell secondary col-7 col-lg-4 col-xl-7">{{item.location}}</div>
								<div class="cell secondary col-5 col-lg-8 col-xl-5">{{item.author.byline}}</div>
							</div>
						</li>
					</router-link>
					<li class="bottom list-group-item" ref="bottom" />
				</ul>
			</div>
		</div>
		<div v-if="selection == 'new'" class="col-12 col-xl-8">
			<ViewDocNew :client="client" :dfn="patient_dfn" :datetime="datetimestring(new Date())" @cancel="() => $router.replace({ path: '/patient/' + patient_dfn + '/document' })" @submit="doc_create" />
		</div>
		<div v-else-if="selection" class="detail col-12 col-xl-8" ref="detail">
			<ViewDocView :client="client" :dfn="patient_dfn" :ien="selection" @sign="doc_sign_prompt" @delete="doc_delete" @cancel="() => $router.replace({ path: '/patient/' + patient_dfn + '/document' })" />
		</div>
	</div>
	<ModalPromptSignatureCode :client="client" v-model:show="show_signature" @submit="doc_sign" label="Sign Document" />
</template>

<style scoped>
	div.selector {
		position: sticky;
		top: 1.15rem;
		z-index: 1;
	}
	ul.scroller.list-skinny {
		max-height: 25vh;
		overflow-y: auto;
	}
	li.record {
		cursor: default;
		border-top: 1px solid #dee2e6;
		padding: 0.25rem 0.75rem;
		scroll-margin-top: 3.6875rem;
	}
	li.record:nth-child(even) {
		background-color: rgba(0, 0, 0, 0.05);
	}
	ul.scroller.list-skinny li.record {
		scroll-margin-top: 0;
	}
	li.record a {
		color: inherit;
	}
	li.record.active {
		color: #fff;
		background-color: #0d6efd;
	}
	li.bottom {
		overflow-anchor: none;
	}
	div.cell {
		overflow: hidden;
		text-overflow: ellipsis;
		white-space: nowrap;
	}
	a.close {
		cursor: default;
		text-decoration: none;
	}
	div.detail /deep/ .card-body {
		scroll-margin-top: calc(3.6875rem + 2.5625rem + 25vh);
		font-family: monospace;
		white-space: pre-wrap;
	}
	@media (min-width: 1200px) {
		div.selector {
			position: static;
		}
		ul.scroller.list-skinny {
			max-height: 75vh;
		}
		div.cell.secondary {
			font-size: 0.8em;
		}
		div.detail /deep/ .card-body {
			max-height: 75vh;
			scroll-margin-top: 0;
			overflow-y: auto;
		}
	}
</style>

<script>
	import { debounce, strptime_vista } from './util.mjs';

	import Subtitle from './Subtitle.vue';
	import ViewDocNew from './ViewDocNew.vue';
	import ViewDocView from './ViewDocView.vue';
	import ModalPromptSignatureCode from './ModalPromptSignatureCode.vue';

	const SZ_WINDOW = 100;

	export default {
		components: {
			Subtitle, ViewDocNew, ViewDocView, ModalPromptSignatureCode
		},
		props: {
			client: Object,
			sensitive: Boolean,
			patient_dfn: String,
			patient_info: Object
		},
		data() {
			return {
				dfn: null,
				has_more: '',
				is_loading: false,
				rs_unsigned: [],
				rs_signed: [],
				selection: null,
				show_signature: false,
				observer_scroller: null,
				observer_viewport: null
			};
		},
		computed: {
			resultset() {
				return this.rs_unsigned.concat(this.rs_signed);
			}
		},
		watch: {
			'$route.params.tiu_da': {
				async handler(value) {
					this.selection = value;
				}, immediate: true
			}
		},
		methods: {
			strptime_vista,
			datestring(date) {
				return date.toLocaleDateString('sv-SE');
			},
			datetimestring(date) {
				return date.toLocaleDateString('sv-SE') + ' ' + date.toLocaleTimeString('en-GB');
			},
			async load_more() {
				try {
					this.is_loading = true;
					if((this.client) && (this.patient_dfn)) {
						if(this.dfn != this.patient_dfn) {
							this.dfn = this.patient_dfn;
							this.has_more = '';
							this.rs_signed = [];
						}
						var res = await client.TIU_DOCUMENTS_BY_CONTEXT(3, 1, this.patient_dfn, -1, -1, 0, SZ_WINDOW, 'D', 1, 0, 1, this.has_more);
						if((res) && (res.length > 0)) {
							res = res.slice();
							var last = res[res.length - 1];
							if((last.title == 'SHOW MORE') && (!last.author) && (!last.visit)) {
								this.has_more = last.IEN;
								res.splice(res.length - 1, 1);
							}
							if(this.rs_signed.length > 0) Array.prototype.push.apply(this.rs_signed, res);
							else this.rs_signed = res;
						}
					} else {
						this.dfn = null;
						this.has_more = '';
						this.rs_signed = [];
					}
				} catch(ex) {
					console.warn(ex);
				} finally {
					this.is_loading = false;
				}
			},
			async load_unsigned() {
				this.rs_unsigned = [];
				this.rs_unsigned = await client.TIU_DOCUMENTS_BY_CONTEXT(3, 2, this.patient_dfn, 0, 0, 0, 0, 'D', 1, 0, 1, '');
			},
			async reload() {
				this.dfn = null;
				await client.TIU_DOCUMENTS_BY_CONTEXT_FLUSH(3, 2, this.patient_dfn, 0, 0, 0, 0, 'D', 1, 0, 1, '');
				await this.load_unsigned();
				await client.TIU_DOCUMENTS_BY_CONTEXT_FLUSH(3, 1, this.patient_dfn, -1, -1, 0, SZ_WINDOW, 'D', 1, 0, 1, '');
				await this.load_more();
			},
			async doc_create(params) {
				var vstr = params.location.datetime ? ('' + params.location.IEN + ';' + params.location.datetime + ';A') : ('' + params.location.IEN + ';' + params.datetime + ';E');
				var res = await this.client.TIU_CREATE_RECORD(this.patient_dfn, params.title, '', '', '', { '".01"': params.title, '"1202"': params.author, '"1301"': params.datetime, '"1205"': params.location.IEN }, vstr, '1');
				if(res) {
					this.reload();
					this.$router.replace({ path: '/patient/' + this.patient_dfn + '/document/' + res, query: { edit: '' } });
				} else {
					console.error('Unable to create document', params, res);
					window.alert('Unable to create document.');
				}
			},
			doc_sign_prompt(ien) {
				this.show_signature = true;
			},
			async doc_sign(code) {
				var selection = this.selection;
				if((selection) & (code)) {
					this.show_signature = false;
					await this.client.TIU_SIGN_RECORD(selection, ' ' + code + ' ');
					this.reload();
					this.selection = null;
					await this.$nextTick();
					this.selection = selection;
				}
			},
			async doc_delete(ien) {
				if(window.confirm('Delete this document?')) {
					var vstr = await this.client.ORWPCE_NOTEVSTR(ien);
					if(vstr) await this.client.ORWPCE_DELETE(vstr, this.patient_dfn);
					await this.client.TIU_DELETE_RECORD(ien);
					this.reload();
					if(this.selection == ien) {
						this.selection = null;
						this.$router.replace({ path: '/patient/' + this.patient_dfn + '/document' });
					}
				}
			}
		},
		created() {
			this.$watch(
				() => (this.client, this.patient_dfn, {}),
				debounce(() => { this.load_more(); this.load_unsigned(); }, 500),
				{ immediate: true }
			);
			this.$watch(
				() => (this.client, this.selection, {}),
				async function() {
					if(this.$refs.scroller) {
						if(this.selection) {	// scroll to selected item
							if(this.selection != 'new') {
								await this.$nextTick();
								var active = this.$refs.scroller.querySelectorAll(':scope > .active');
								if(active.length > 0) (Element.prototype.scrollIntoViewIfNeeded || Element.prototype.scrollIntoView).call(active[0]);
								if(this.$refs.detail) {	// scroll to top of detail panel
									this.$refs.detail.scrollIntoView();
									this.$refs.detail.scrollTop = 0;
								}
							}
						} else { // scroll to topmost item
							var offset = this.$refs.scroller.getBoundingClientRect().top;
							for(var children = this.$refs.scroller.children, count = children.length, i = 0; i < count; ++i) if(children[i].getBoundingClientRect().top >= offset) {
								await this.$nextTick();
								var behavior = document.documentElement.style.scrollBehavior;
								document.documentElement.style.scrollBehavior = 'auto';	// inhibit Bootstrap smooth scrolling
								children[i].scrollIntoView();
								document.documentElement.style.scrollBehavior = behavior;
								break;
							}
						}
					}
				},
				{ immediate: true }
			);
		},
		mounted() {
			this.observer_scroller = new IntersectionObserver(([entry]) => { if((entry.isIntersecting) && (this.selection) && (this.has_more) && (!this.is_loading)) this.load_more(); }, { root: this.$refs.scroller, rootMargin: '25%' });
			this.observer_scroller.observe(this.$refs.bottom);
			this.observer_viewport = new IntersectionObserver(([entry]) => { if((entry.isIntersecting) && (!this.selection) && (this.has_more) && (!this.is_loading)) this.load_more(); }, { rootMargin: '25%' });
			this.observer_viewport.observe(this.$refs.bottom);
		},
		destroyed() {
			if(this.observer_viewport) this.observer_viewport.disconnect();
			if(this.observer_scroller) this.observer_scroller.disconnect();
		}
	};
</script>
