feat: add chain tools workflow

web/src/app.css

@@ -154,3 +154,71 @@ input.control[type='number'] {
 	white-space: nowrap;
 	border: 0;
 }
+
+.tool-stage {
+	display: grid;
+	grid-template-columns: repeat(2, minmax(0, 1fr));
+	gap: var(--space-4);
+	padding: var(--space-4);
+	align-items: start;
+	width: 100%;
+}
+
+.tool-stage.single {
+	grid-template-columns: 1fr;
+}
+
+.tool-stage .cell {
+	min-width: 0;
+	display: flex;
+	flex-direction: column;
+	gap: var(--space-2);
+}
+
+.tool-stage .cell + .cell {
+	border-left: 1px solid var(--border);
+	padding-left: var(--space-4);
+}
+
+.cell-media {
+	flex: 1;
+	display: flex;
+	flex-direction: column;
+	align-items: center;
+	justify-content: center;
+	min-height: 14rem;
+	position: relative;
+	width: 100%;
+}
+
+.chain-stack {
+	display: flex;
+	flex-direction: column;
+	gap: var(--space-3);
+	margin-top: var(--space-4);
+}
+
+.actions-row {
+	display: flex;
+	gap: var(--space-1);
+	align-items: stretch;
+	width: 100%;
+}
+
+.actions-row > button {
+	flex: 1;
+	min-width: 0;
+}
+
+@media (max-width: 48rem) {
+	.tool-stage {
+		grid-template-columns: 1fr;
+	}
+
+	.tool-stage .cell + .cell {
+		border-left: none;
+		padding-left: 0;
+		border-top: 1px solid var(--border);
+		padding-top: var(--space-4);
+	}
+}

web/src/lib/components/ToolPage.svelte

@@ -2,7 +2,13 @@
 	import { imageInfo, type ImageInfo } from '$lib/core/analyze';
 	import { decodeFile, isSupportedImage, unsupportedImageMessage } from '$lib/core/io';
 	import type { PixelImage } from '$lib/core/types';
-	import { defaultParams, sanitizeParams, type ToolEntry } from '$lib/registry';
+	import { defaultParams, getTool, outputOf, sanitizeParams, type ToolEntry } from '$lib/registry';
+	import { newStepId, type PipelineStep } from '$lib/tools/pipeline';
+	import DownloadButton from './DownloadButton.svelte';
+	import ParamForm from './ParamForm.svelte';
+	import Preview from './Preview.svelte';
+	import ToolSearch from './search/ToolSearch.svelte';
+	import ChainToolBlock from './chain/ChainToolBlock.svelte';
 	import { createAutoRunner } from '$lib/tools/auto-run';
 	import ParamsCard from './tool/ParamsCard.svelte';
 	import ResultCard from './tool/ResultCard.svelte';
@@ -22,11 +28,47 @@
 	let info = $state<ImageInfo | null>(null);
 	let errorText = $state('');
 	let values = $state<Record<string, any>>({});
+	let chain = $state<PipelineStep[]>([]);
+	let chainResults = $state<(PixelImage | null)[]>([]);
+	let lastRunChainJson = '';
 
 	const isInfo = $derived(tool.resultType === 'info');
 	const isSourceless = $derived(tool.sourceMode === 'none');
 	const isTextSource = $derived(tool.sourceMode === 'text');
 	const sanitized = $derived(sanitizeParams(tool, values));
+	const canChainBase = $derived(
+		(tool.resultType ?? 'image') === 'image' && tool.sourceMode !== 'text'
+	);
+	const hasFilledSteps = $derived(chain.some((step) => step.toolId !== ''));
+
+	function addChainStep() {
+		chain.push({ id: newStepId(), toolId: '', values: {} });
+	}
+
+	function removeChainStep(index: number) {
+		chain.splice(index, 1);
+		chainResults = [];
+	}
+
+	function removeChain() {
+		chain.length = 0;
+		chainResults = [];
+	}
+
+	function toggleChain() {
+		if (chain.length > 0) {
+			removeChain();
+		} else {
+			addChainStep();
+		}
+	}
+
+	function applyChainTool(index: number, toolId: string) {
+		const stepTool = getTool(toolId);
+		if (!stepTool || !chain[index]) return;
+		chain[index].toolId = toolId;
+		chain[index].values = defaultParams(stepTool);
+	}
 
 	const runner = createAutoRunner();
 	let hasLastRun = false;
@@ -91,6 +133,7 @@
 		hasLastRun = true;
 		lastRunSource = source;
 		lastRunValuesJson = JSON.stringify(sanitized);
+		lastRunChainJson = JSON.stringify(chain);
 		try {
 			let next: PixelImage | null = null;
 			let nextText: string | null = null;
@@ -116,6 +159,26 @@
 			result = next;
 			previewResult = nextPreview;
 			textResult = nextText;
+
+			const collected: (PixelImage | null)[] = [];
+			let current: PixelImage | null = next ?? source;
+			for (let i = 0; i < chain.length; i++) {
+				const step = chain[i];
+				const stepTool = step.toolId === '' ? undefined : getTool(step.toolId);
+				if (!current || !stepTool?.run) {
+					collected.push(null);
+					continue;
+				}
+				try {
+					current = await stepTool.run(current, sanitizeParams(stepTool, step.values));
+				} catch (e) {
+					const message = e instanceof Error ? e.message : String(e);
+					throw new Error(`Шаг ${i + 1} (${stepTool.title}): ${message}`);
+				}
+				if (!runner.isCurrent(token)) return;
+				collected.push(current);
+			}
+			chainResults = collected;
 			status = 'loaded';
 		} catch (e) {
 			if (!runner.isCurrent(token)) return;
@@ -125,7 +188,15 @@
 
 	$effect(() => {
 		const valuesJson = JSON.stringify(sanitized);
-		if (hasLastRun && source === lastRunSource && valuesJson === lastRunValuesJson) return;
+		const chainJson = JSON.stringify(chain);
+		if (
+			hasLastRun &&
+			source === lastRunSource &&
+			valuesJson === lastRunValuesJson &&
+			chainJson === lastRunChainJson
+		) {
+			return;
+		}
 		if (!source && !isSourceless) return;
 		if (isInfo) return;
 		return runner.schedule(() => void runTool());
@@ -178,7 +249,7 @@
 		<div class="error-banner" role="alert">{errorText}</div>
 	{/if}
 
-	<div class="stage panel" class:single={isSourceless}>
+	<div class="panel tool-stage" class:single={isSourceless}>
 		{#if !isSourceless}
 			<div class="cell">
 				{#if isTextSource && !source}
@@ -206,20 +277,60 @@
 				{info}
 				{isInfo}
 				params={sanitized}
-				{textResult}
+				textResult={textResult}
 				onDownloadError={showError}
+				onChainToggle={canChainBase ? toggleChain : undefined}
+				hasChain={chain.length > 0}
 			/>
 		</div>
 	</div>
 
 	{#if (source || isSourceless) && !isInfo}
+		<div class="base-params">
 			<ParamsCard
 				params={tool.params}
 				bind:values
 				{pipetteTargetId}
 				onPipetteToggle={handlePipetteToggle}
 			/>
+		</div>
 	{/if}
+
+	<div class="chain-stack">
+		{#each chain as step, index (step.id)}
+			{#if step.toolId === ''}
+				<div class="panel empty-slot">
+					<header>
+						<h3 class="heading-section">Шаг {index + 1}</h3>
+						<button
+							type="button"
+							class="remove-step"
+							aria-label="Убрать шаг"
+							onclick={() => removeChainStep(index)}
+						>
+							✕
+						</button>
+					</header>
+					<ToolSearch onSelect={(id) => applyChainTool(index, id)} />
+				</div>
+			{:else if getTool(step.toolId)}
+				{@const stepTool = getTool(step.toolId)!}
+				<ChainToolBlock
+					index={index}
+					tool={stepTool}
+					bind:values={step.values}
+					input={index === 0 ? result : (chainResults[index - 1] ?? null)}
+					result={chainResults[index] ?? null}
+					busy={status === 'processing'}
+					isLast={index === chain.length - 1}
+					onRemove={() => removeChainStep(index)}
+					onError={showError}
+					onAddStep={addChainStep}
+					onRemoveChain={removeChain}
+				/>
+			{/if}
+		{/each}
+	</div>
 </section>
 
 <style>
@@ -236,37 +347,40 @@
 		margin-bottom: var(--space-3);
 	}
 
-	.stage {
-		display: grid;
-		grid-template-columns: repeat(2, minmax(0, 1fr));
-		gap: var(--space-4);
-		padding: var(--space-4);
+	.base-params {
+		margin-top: var(--space-4);
 	}
 
-	.stage.single {
-		grid-template-columns: 1fr;
+	.empty-slot {
+		padding: var(--space-3);
 	}
 
-	.cell {
-		min-width: 0;
+	.empty-slot header {
 		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: var(--space-2);
+		margin-bottom: var(--space-2);
 	}
 
-	.cell + .cell {
-		border-left: 1px solid var(--border);
-		padding-left: var(--space-4);
+	.empty-slot h3 {
+		margin: 0;
 	}
 
-	@media (max-width: 48rem) {
-		.stage {
-			grid-template-columns: 1fr;
+	.remove-step {
+		width: 1.6rem;
+		height: 1.6rem;
+		padding: 0;
+		border: 1px solid var(--border);
+		border-radius: var(--radius-s);
+		background: var(--surface);
+		color: var(--text-muted);
+		line-height: 1;
+		cursor: pointer;
 	}
 
-		.cell + .cell {
-			border-left: none;
-			padding-left: 0;
-			border-top: 1px solid var(--border);
-			padding-top: var(--space-4);
-		}
+	.remove-step:hover {
+		border-color: var(--danger);
+		color: var(--danger);
 	}
 </style>

web/src/lib/components/chain/ChainToolBlock.svelte

@@ -0,0 +1,147 @@
+<script lang="ts">
+	import { outputOf, sanitizeParams, type ToolEntry } from '$lib/registry';
+	import type { PixelImage } from '$lib/core/types';
+	import DownloadButton from '../DownloadButton.svelte';
+	import Button from '../ui/Button.svelte';
+	import EmptyState from '../ui/EmptyState.svelte';
+	import ParamsCard from '../tool/ParamsCard.svelte';
+	import Preview from '../Preview.svelte';
+
+	interface Props {
+		index: number;
+		tool: ToolEntry;
+		values: Record<string, any>;
+		input: PixelImage | null;
+		result: PixelImage | null;
+		busy: boolean;
+		isLast: boolean;
+		onRemove: () => void;
+		onError: (e: unknown) => void;
+		onAddStep: () => void;
+		onRemoveChain: () => void;
+	}
+
+	let {
+		index,
+		tool,
+		values = $bindable(),
+		input,
+		result,
+		busy,
+		isLast,
+		onRemove,
+		onError,
+		onAddStep,
+		onRemoveChain
+	}: Props = $props();
+
+	const format = $derived(outputOf(tool));
+	const safeParams = $derived(sanitizeParams(tool, values));
+</script>
+
+<div class="block">
+	<header>
+		<h3 class="heading-section">Шаг {index + 1}: {tool.title}</h3>
+		<button
+			type="button"
+			class="remove"
+			aria-label="Убрать шаг"
+			title="Убрать шаг"
+			onclick={onRemove}
+		>
+			✕
+		</button>
+	</header>
+
+	<div class="tool-stage panel">
+		<div class="cell">
+			<h4 class="heading-section">Вход</h4>
+			<div class="cell-media">
+				<Preview image={input} />
+			</div>
+		</div>
+		<div class="cell">
+			<h4 class="heading-section">Результат</h4>
+			{#if busy && !result}
+				<div class="cell-media">
+					<EmptyState title="Обработка…" hint="Выполняется шаг цепочки" />
+				</div>
+			{:else}
+				<div class="cell-media">
+					<Preview image={result} />
+					{#if busy}
+						<span class="recalc" aria-live="polite">Пересчёт…</span>
+					{/if}
+				</div>
+				<div class="actions-row">
+					<DownloadButton
+						image={result}
+						format={format}
+						baseName="{index + 1}-{tool.id}"
+						params={safeParams}
+						{onError}
+					/>
+					<Button variant="secondary" fullWidth onclick={isLast ? onAddStep : onRemoveChain}>
+						{isLast ? '⛓ Следующий инструмент' : '✂ Оборвать цепочку'}
+					</Button>
+				</div>
+			{/if}
+		</div>
+	</div>
+
+	<ParamsCard params={tool.params} bind:values />
+</div>
+
+<style>
+	.block {
+		display: flex;
+		flex-direction: column;
+		gap: var(--space-2);
+	}
+
+	header {
+		display: flex;
+		align-items: center;
+		justify-content: space-between;
+		gap: var(--space-2);
+	}
+
+	h3 {
+		margin: 0;
+	}
+
+	.remove {
+		width: 1.6rem;
+		height: 1.6rem;
+		padding: 0;
+		border: 1px solid var(--border);
+		border-radius: var(--radius-s);
+		background: var(--surface);
+		color: var(--text-muted);
+		line-height: 1;
+		cursor: pointer;
+		transition:
+			border-color var(--transition-fast),
+			color var(--transition-fast);
+	}
+
+	.remove:hover {
+		border-color: var(--danger);
+		color: var(--danger);
+	}
+
+	h4 {
+		margin-bottom: var(--space-1);
+	}
+
+	.recalc {
+		position: absolute;
+		top: var(--space-2);
+		right: var(--space-2);
+		padding: 2px var(--space-2);
+		border-radius: var(--radius-s);
+		background: color-mix(in srgb, var(--accent) 12%, var(--surface));
+		color: var(--accent);
+		font-size: var(--text-xs);
+	}
+</style>

web/src/lib/components/search/ToolSearch.svelte

@@ -2,11 +2,10 @@
 	import { isChainable, TOOLS } from '$lib/registry';
 
 	interface Props {
-		size?: 'hero' | 'compact';
 		onSelect: (toolId: string) => void;
 	}
 
-	let { size = 'hero', onSelect }: Props = $props();
+	let { onSelect }: Props = $props();
 
 	const candidates = TOOLS.filter(isChainable);
 
@@ -51,7 +50,7 @@
 			}
 		}
 		found.sort((a, b) => b.score - a.score || a.title.localeCompare(b.title));
-		return found.slice(0, size === 'hero' ? 12 : 8);
+		return found.slice(0, 12);
 	});
 
 	function choose(id: string) {
@@ -79,7 +78,7 @@
 	}
 </script>
 
-<div class="search {size}">
+<div class="search">
 	<input
 		type="search"
 		bind:value={query}
@@ -120,25 +119,16 @@
 	.search {
 		position: relative;
 		width: 100%;
-		max-width: var(--control-max-width);
-	}
-
-	.hero {
 		max-width: 36rem;
 		margin: 0 auto;
 	}
 
 	input {
 		width: 100%;
-		padding: var(--space-2) var(--space-3);
+		padding: var(--space-3) var(--space-4);
 		border: 1px solid var(--border);
 		border-radius: var(--radius-m);
 		background: var(--surface);
-		font-size: var(--text-l);
-	}
-
-	.hero input {
-		padding: var(--space-3) var(--space-4);
 		font-size: var(--text-xl);
 		text-align: center;
 	}
@@ -163,6 +153,7 @@
 		box-shadow: var(--shadow-card);
 		max-height: 24rem;
 		overflow-y: auto;
+		text-align: left;
 	}
 
 	li button {

web/src/lib/components/tool/ParamsCard.svelte

@@ -25,7 +25,6 @@
 
 <style>
 	.root {
-		margin-top: var(--space-4);
 		padding: var(--space-4);
 	}
 

web/src/lib/components/tool/ResultCard.svelte

@@ -1,5 +1,6 @@
 <script lang="ts">
 	import CheckboxField from '../ui/CheckboxField.svelte';
+	import Button from '../ui/Button.svelte';
 	import DownloadButton from '../DownloadButton.svelte';
 	import EmptyState from '../ui/EmptyState.svelte';
 	import InfoPanel from '../InfoPanel.svelte';
@@ -22,6 +23,8 @@
 		isInfo: boolean;
 		params: Record<string, unknown>;
 		textResult: string | null;
+		onChainToggle?: () => void;
+		hasChain?: boolean;
 		onDownloadError: (e: unknown) => void;
 	}
 
@@ -36,6 +39,8 @@
 		isInfo,
 		params,
 		textResult,
+		onChainToggle,
+		hasChain = false,
 		onDownloadError
 	}: Props = $props();
 
@@ -81,6 +86,7 @@
 				<span class="recalc" aria-live="polite">Пересчёт…</span>
 			{/if}
 		</div>
+		<div class="actions-row">
 			<DownloadButton
 				image={result}
 				format={outputOf(tool)}
@@ -88,6 +94,12 @@
 				{params}
 				onError={onDownloadError}
 			/>
+			{#if onChainToggle}
+				<Button variant="secondary" fullWidth onclick={onChainToggle}>
+					{hasChain ? '✂ Оборвать цепочку' : '⛓ Следующий инструмент'}
+				</Button>
+			{/if}
+		</div>
 	{/if}
 </div>
 

web/src/routes/+page.svelte

@@ -18,7 +18,7 @@
 	<section class="hero">
 		<h1>Что делаем с изображением?</h1>
 		<p class="lead text-muted">Найдите инструмент — все операции выполняются локально в браузере.</p>
-		<ToolSearch size="hero" onSelect={(id) => (selectedId = id)} />
+		<ToolSearch onSelect={(id) => (selectedId = id)} />
 	</section>
 {:else}
 	<section class="workbench">