<!--
SPDX-FileCopyrightText: syuilo and other misskey contributors
SPDX-License-Identifier: AGPL-3.0-only
-->

<template>
<div>
	<div :class="$style.label" @click="focus"><slot name="label"></slot></div>
	<div :class="{ [$style.disabled]: disabled, [$style.focused]: focused, [$style.tall]: tall, [$style.pre]: pre }" style="position: relative;">
		<textarea
			ref="inputEl"
			v-model="v"
			v-adaptive-border
			:class="[$style.textarea, { _monospace: code }]"
			:disabled="disabled"
			:required="required"
			:readonly="readonly"
			:placeholder="placeholder"
			:pattern="pattern"
			:autocomplete="autocomplete"
			:spellcheck="spellcheck"
			@focus="focused = true"
			@blur="focused = false"
			@keydown="onKeydown($event)"
			@input="onInput"
		></textarea>
	</div>
	<div :class="$style.caption"><slot name="caption"></slot></div>
	<button v-if="mfmPreview" style="font-size: 0.85em;" class="_textButton" type="button" @click="preview = !preview">{{ i18n.ts.preview }}</button>
	<div v-if="mfmPreview" v-show="preview" v-panel :class="$style.mfmPreview">
		<Mfm :text="v"/>
	</div>

	<MkButton v-if="manualSave && changed" primary :class="$style.save" @click="updated"><i class="ph-floppy-disk ph-bold ph-lg"></i> {{ i18n.ts.save }}</MkButton>
</div>
</template>

<script lang="ts" setup>
import { onMounted, onUnmounted, nextTick, ref, watch, computed, toRefs, shallowRef } from 'vue';
import { debounce } from 'throttle-debounce';
import MkButton from '@/components/MkButton.vue';
import { i18n } from '@/i18n.js';
import { Autocomplete, SuggestionType } from '@/scripts/autocomplete.js';

const props = defineProps<{
	modelValue: string | null;
	required?: boolean;
	readonly?: boolean;
	disabled?: boolean;
	pattern?: string;
	placeholder?: string;
	autofocus?: boolean;
	autocomplete?: string;
	mfmAutocomplete?: boolean | SuggestionType[],
	mfmPreview?: boolean;
	spellcheck?: boolean;
	debounce?: boolean;
	manualSave?: boolean;
	code?: boolean;
	tall?: boolean;
	pre?: boolean;
}>();

const emit = defineEmits<{
	(ev: 'change', _ev: KeyboardEvent): void;
	(ev: 'keydown', _ev: KeyboardEvent): void;
	(ev: 'enter'): void;
	(ev: 'update:modelValue', value: string): void;
}>();

const { modelValue, autofocus } = toRefs(props);
const v = ref<string>(modelValue.value ?? '');
const focused = ref(false);
const changed = ref(false);
const invalid = ref(false);
const filled = computed(() => v.value !== '' && v.value != null);
const inputEl = shallowRef<HTMLTextAreaElement>();
const preview = ref(false);
let autocompleteWorker: Autocomplete | null = null;

const focus = () => inputEl.value?.focus();
const onInput = (ev) => {
	changed.value = true;
	emit('change', ev);
};
const onKeydown = (ev: KeyboardEvent) => {
	if (ev.isComposing || ev.key === 'Process' || ev.keyCode === 229) return;

	emit('keydown', ev);

	if (ev.code === 'Enter') {
		emit('enter');
	}

	if (props.code && ev.key === 'Tab') {
		const pos = inputEl.value?.selectionStart ?? 0;
		const posEnd = inputEl.value?.selectionEnd ?? v.value.length;
		v.value = v.value.slice(0, pos) + '\t' + v.value.slice(posEnd);
		nextTick(() => {
			inputEl.value?.setSelectionRange(pos + 1, pos + 1);
		});
		ev.preventDefault();
	}
};

const updated = () => {
	changed.value = false;
	emit('update:modelValue', v.value ?? '');
};

const debouncedUpdated = debounce(1000, updated);

watch(modelValue, newValue => {
	v.value = newValue ?? '';
});

watch(v, () => {
	if (!props.manualSave) {
		if (props.debounce) {
			debouncedUpdated();
		} else {
			updated();
		}
	}

	invalid.value = inputEl.value?.validity.badInput ?? true;
});

onMounted(() => {
	nextTick(() => {
		if (autofocus.value) {
			focus();
		}
	});

	if (props.mfmAutocomplete && inputEl.value) {
		autocompleteWorker = new Autocomplete(inputEl.value, v, props.mfmAutocomplete === true ? undefined : props.mfmAutocomplete);
	}
});

onUnmounted(() => {
	if (autocompleteWorker) {
		autocompleteWorker.detach();
	}
});
</script>

<style lang="scss" module>
.label {
	font-size: 0.85em;
	padding: 0 0 8px 0;
	user-select: none;

	&:empty {
		display: none;
	}
}

.caption {
	font-size: 0.85em;
	padding: 8px 0 0 0;
	color: var(--fgTransparentWeak);

	&:empty {
		display: none;
	}
}

.textarea {
	appearance: none;
	-webkit-appearance: none;
	display: block;
	width: 100%;
	min-width: 100%;
	max-width: 100%;
	min-height: 130px;
	margin: 0;
	padding: 12px;
	font: inherit;
	font-weight: normal;
	font-size: 1em;
	color: var(--fg);
	background: var(--panel);
	border: solid 1px var(--panel);
	border-radius: var(--radius-sm);
	outline: none;
	box-shadow: none;
	box-sizing: border-box;
	transition: border-color 0.1s ease-out;

	&:hover {
		border-color: var(--inputBorderHover) !important;
	}
}

.focused {
	> .textarea {
		border-color: var(--accent) !important;
	}
}

.disabled {
	opacity: 0.7;
	cursor: not-allowed !important;

	> .textarea {
		cursor: not-allowed !important;
	}
}

.tall {
	> .textarea {
		min-height: 200px;
	}
}

.pre {
	> .textarea {
		white-space: pre;
	}
}

.save {
	margin: 8px 0 0 0;
}

.mfmPreview {
  padding: 12px;
  border-radius: var(--radius);
  box-sizing: border-box;
  min-height: 130px;
	pointer-events: none;
}
</style>
