import test from 'node:test';
import assert from 'node:assert/strict';
import { EditorHistory, createBlock, locate, insertBlock, duplicateBlock, moveBlock, upgradeDocument, effectiveDesign, setDesign, insertPreset, insertRow, blockPath, insertMedia, setEffect, isPluginBlock, blockLabel, blockIcon, canContain, isContainer, setStyle, effectiveStyle, hoverStyle, resetStyleDevice, clearStyle, copyStyle } from '../public/assets/editor-model.js';
import { readFile } from 'node:fs/promises';
import { designCss } from '../scripts/build-design.mjs';

function fixture() { return { schemaVersion: 1, title: 'Page', description: 'Description', blocks: [{ id: 's1', type: 'section', children: [{ id: 'h1', type: 'heading', props: { text: 'Hello', level: 1 } }, { id: 't1', type: 'text', props: { text: 'Body' } }] }, { id: 's2', type: 'section', children: [] }] }; }

test('typing coalesces into one undo and redo; saved state tracks content, not stack length', () => {
  const history = new EditorHistory(fixture());
  history.change(doc => doc.title = 'New', 'title');
  history.change(doc => doc.title = 'New title', 'title');
  assert.equal(history.past.length, 1);
  history.undo(); assert.equal(history.document.title, 'Page'); assert.equal(history.dirty, false);
  history.redo(); assert.equal(history.document.title, 'New title'); assert.equal(history.dirty, true);
  history.markSaved(history.document); assert.equal(history.dirty, false);
  history.undo(); assert.equal(history.dirty, true);
  history.redo(); assert.equal(history.dirty, false);
});

test('new edit after undo drops redo and source snapshots remain immutable', () => {
  const original = fixture(); const history = new EditorHistory(original);
  history.change(doc => locate(doc.blocks, 't1').block.props.text = 'changed');
  history.undo(); history.change(doc => doc.title = 'Branch');
  assert.equal(history.future.length, 0); assert.equal(original.title, 'Page');
  assert.equal(locate(original.blocks, 't1').block.props.text, 'Body');
});

test('add into selected container, add after leaf, and duplicate assigns fresh IDs recursively', () => {
  const document = fixture();
  const id = insertBlock(document, 'text', 's2'); assert.equal(locate(document.blocks, id).parent.id, 's2');
  const after = insertBlock(document, 'button', 't1'); assert.equal(document.blocks[0].children[2].id, after);
  const copy = duplicateBlock(document, 's1');
  const copied = locate(document.blocks, copy).block;
  assert.notEqual(copied.children[0].id, 'h1'); assert.equal(copied.children[0].props.level, 2);
  assert.equal(document.blocks[0].children[0].props.level, 1);
});

test('moving prevents self/descendant cycles and supports cross-container moves', () => {
  const document = fixture();
  assert.equal(moveBlock(document, 's1', 'h1', true), false);
  assert.equal(moveBlock(document, 's1', 's1', true), false);
  assert.equal(moveBlock(document, 'h1', 't1', true), false);
  assert.equal(moveBlock(document, 't1', 's2', true), true);
  assert.equal(locate(document.blocks, 't1').parent.id, 's2');
  assert.equal(moveBlock(document, 's2', 's1'), true);
  assert.equal(document.blocks[0].id, 's2');
});

test('history persists exact block document after add, move, delete, undo and JSON reload', () => {
  const history = new EditorHistory(fixture());
  const id = history.change(doc => insertBlock(doc, 'image', 's2'));
  history.change(doc => moveBlock(doc, id, 't1'));
  const saved = structuredClone(history.document);
  history.change(doc => { const target = locate(doc.blocks, id); target.siblings.splice(target.index, 1); });
  history.undo(); assert.deepEqual(history.document, saved);
  const loaded = new EditorHistory(JSON.parse(JSON.stringify(history.document)));
  assert.deepEqual(loaded.document, saved); assert.equal(loaded.dirty, false);
  assert.throws(() => createBlock('unknown'));
});

test('v1 to v2 migration preserves all content and IDs, is idempotent and rejects future versions', () => {
  const original = fixture(); const migrated = upgradeDocument(structuredClone(original));
  assert.deepEqual(migrated, { ...original, schemaVersion: 2 });
  assert.deepEqual(upgradeDocument(structuredClone(migrated)), migrated);
  assert.throws(() => upgradeDocument({ ...original, schemaVersion: 999 }));
  assert.equal(original.schemaVersion, 1);
});

test('responsive inheritance, reset, migration undo, and reload preserve distinct device values', () => {
  const history = new EditorHistory(fixture());
  history.change(doc => setDesign(doc, 'h1', 'desktop', 'fontSize', 'hero'));
  assert.equal(history.document.schemaVersion, 2);
  const heading = () => locate(history.document.blocks, 'h1').block;
  assert.deepEqual(effectiveDesign(heading(), 'mobile', 'fontSize'), { value: 'hero', source: 'desktop' });
  history.undo(); assert.deepEqual(history.document, fixture()); history.redo();
  history.change(doc => setDesign(doc, 'h1', 'tablet', 'fontSize', 'display'));
  history.change(doc => setDesign(doc, 'h1', 'mobile', 'fontSize', 'title'));
  assert.equal(effectiveDesign(heading(), 'desktop', 'fontSize').value, 'hero');
  assert.equal(effectiveDesign(heading(), 'mobile', 'fontSize').value, 'title');
  history.change(doc => setDesign(doc, 'h1', 'mobile', 'fontSize', ''));
  assert.deepEqual(effectiveDesign(heading(), 'mobile', 'fontSize'), { value: 'display', source: 'tablet' });
  history.undo(); assert.equal(effectiveDesign(heading(), 'mobile', 'fontSize').value, 'title');
  assert.deepEqual(JSON.parse(JSON.stringify(history.document)), history.document);
});

test('presets insert after containing section, keep a single H1, unique IDs, and undo atomically', () => {
  const history = new EditorHistory(fixture());
  for (const name of ['intro', 'columns', 'cta']) {
    const id = history.change(doc => insertPreset(doc, name, 'h1'));
    assert.equal(history.document.blocks[1].id, id);
    assert.deepEqual(blockPath(history.document.blocks, 'h1').map(block => block.id), ['s1', 'h1']);
  }
  const nodes = [];
  const visit = blocks => blocks.forEach(block => { nodes.push(block); visit(block.children || []); });
  visit(history.document.blocks);
  assert.equal(new Set(nodes.map(block => block.id)).size, nodes.length);
  assert.equal(nodes.filter(block => block.type === 'heading' && block.props.level === 1).length, 1);
  history.undo(); history.undo(); history.undo(); assert.deepEqual(history.document, fixture());
});

test('committed CSS matches the shared validated token manifest', async () => {
  const tokens = JSON.parse(await readFile(new URL('../public/assets/design-tokens.json', import.meta.url), 'utf8'));
  assert.equal(await readFile(new URL('../public/assets/design.css', import.meta.url), 'utf8'), designCss(tokens));
});

test('v3 media and effects keep originals, gallery restrictions, and atomic undo', () => {
  const history = new EditorHistory(fixture());
  const media = { id: 'a'.repeat(32), alt: 'Landscape', variants: [{src: '/media/a/480.webp', width: 480, height: 320}] };
  const gallery = history.change(doc => insertMedia(doc, 's2', [media, media]));
  assert.equal(history.document.schemaVersion, 3);
  const children = locate(history.document.blocks, gallery).block.children;
  assert.equal(children.length, 2); assert.notEqual(children[0].id, children[1].id);
  assert.equal(moveBlock(history.document, 'h1', gallery, true), false);
  assert.equal(moveBlock(history.document, 'h1', children[0].id), false);
  const text = history.change(doc => insertBlock(doc, 'text', children[0].id));
  assert.notEqual(locate(history.document.blocks, text).parent?.id, gallery);
  history.undo();
  history.change(doc => setEffect(doc, gallery, 'shadow', 'soft'));
  history.change(doc => setDesign(doc, gallery, 'mobile', 'columns', 'one'));
  assert.equal(history.document.schemaVersion, 3);
  history.undo(); history.undo(); history.undo(); assert.deepEqual(history.document, fixture());
});

test('plugin blocks stay movable and intact while the editor refuses to fill or edit them', () => {
  const plugin = { id: 'p1', type: 'acme.slider', props: { slides: [{ headline: 'From the plugin' }] }, children: [{ id: 'pc1', type: 'text', props: { text: 'Nested' } }] };
  const start = { schemaVersion: 4, title: 'Page', description: 'Description', blocks: [{ id: 's1', type: 'section', children: [{ id: 'h1', type: 'heading', props: { text: 'Hello', level: 1 } }] }, structuredClone(plugin)] };
  const history = new EditorHistory(structuredClone(start));

  assert.equal(isPluginBlock(plugin), true);
  assert.equal(isPluginBlock({ type: 'section' }), false);
  for (const type of ['Acme.Slider', 'acme.', '.slider', 'acme/slider', 'section']) assert.equal(isPluginBlock({ type }), false, type);
  assert.equal(blockLabel(plugin), 'Baustein acme.slider');
  assert.equal(blockIcon(plugin), '❔');
  assert.equal(blockLabel({ type: 'section' }), 'Sektion');

  // Nothing may be dropped into a block whose layout contract the core does not know.
  assert.equal(canContain(plugin, { type: 'text' }), false);
  assert.equal(isContainer(plugin), false);
  assert.equal(moveBlock(history.document, 'h1', 'p1', true), false);
  assert.throws(() => createBlock('acme.slider'), /Unbekannter Block/);

  // Moving and duplicating preserve the stored block including its unknown props and children.
  assert.equal(history.change(doc => moveBlock(doc, 'p1', 's1', true)), true);
  assert.equal(locate(history.document.blocks, 'p1').parent.id, 's1');
  const copy = history.change(doc => duplicateBlock(doc, 'p1'));
  const duplicate = locate(history.document.blocks, copy).block;
  assert.notEqual(duplicate.id, 'p1');
  assert.notEqual(duplicate.children[0].id, 'pc1');
  assert.deepEqual(duplicate.props, plugin.props);
  assert.deepEqual(locate(history.document.blocks, 'p1').block.props, plugin.props);

  // A full undo must restore the plugin block byte for byte.
  history.undo(); history.undo();
  assert.deepEqual(history.document, start);
  assert.equal(upgradeDocument(history.document, 4).schemaVersion, 4);
  assert.deepEqual(JSON.parse(JSON.stringify(history.document)).blocks.find(b => b.id === 'p1'), plugin);
});

test('the post list block carries only its filter, lifts the schema to v5 and undoes atomically', () => {
  const history = new EditorHistory(fixture());
  const id = history.change(doc => insertBlock(doc, 'postlist', 's2'));
  const block = locate(history.document.blocks, id).block;

  // Content is the filter and the count; the posts themselves are added when the page is served.
  assert.deepEqual(block.props, { count: 3, category: '', tag: '' });
  assert.equal(block.children, undefined);
  assert.equal(history.document.schemaVersion, 5);

  // Nothing can be nested inside it, and it does not swallow a following block.
  assert.equal(canContain(block, { type: 'text' }), false);
  const text = history.change(doc => insertBlock(doc, 'text', id));
  assert.notEqual(locate(history.document.blocks, text).parent?.id, id);

  history.undo(); history.undo();
  assert.deepEqual(history.document, fixture());
  assert.equal(history.document.schemaVersion, 1);
});

test('v6 containers accept only their own children and an accordion starts with one entry', () => {
  const history = new EditorHistory(fixture());
  const accordion = history.change(doc => insertBlock(doc, 'accordion', 's2'));
  const block = locate(history.document.blocks, accordion).block;

  assert.equal(history.document.schemaVersion, 6);
  // An empty accordion would render as nothing, so it comes with one entry.
  assert.equal(block.children.length, 1);
  assert.equal(block.children[0].type, 'accordionitem');
  assert.deepEqual(block.children[0].props, { title: 'Eine Frage', open: false });

  // Only accordion entries go into an accordion, and an entry goes nowhere else.
  assert.equal(canContain(block, { type: 'text' }), false);
  assert.equal(canContain(block, { type: 'accordionitem' }), true);
  assert.equal(canContain({ type: 'section', children: [] }, { type: 'accordionitem' }), false);
  assert.equal(canContain(block.children[0], { type: 'text' }), true);

  // A logo strip takes images only, like a gallery.
  const logos = history.change(doc => insertBlock(doc, 'logos', 's2'));
  const strip = locate(history.document.blocks, logos).block;
  assert.equal(canContain(strip, { type: 'image' }), true);
  assert.equal(canContain(strip, { type: 'iconcard' }), false);

  // Leaf blocks stay leaves and keep their defaults.
  // Two statements on purpose: history.change() replaces the document, so reading
  // history.document.blocks in the same expression would search the previous snapshot.
  const statId = history.change(doc => insertBlock(doc, 'stat', 's2'));
  const stat = locate(history.document.blocks, statId).block;
  assert.equal(stat.children, undefined);
  assert.deepEqual(stat.props, { value: '15+', label: 'Jahre Erfahrung' });

  history.undo(); history.undo(); history.undo();
  assert.deepEqual(history.document, fixture());
});

test('a new tab group starts with two tabs and accepts nothing but tabs', () => {
  const history = new EditorHistory(fixture());
  const id = history.change(doc => insertBlock(doc, 'tabs', 's2'));
  const group = locate(history.document.blocks, id).block;

  assert.equal(history.document.schemaVersion, 7);
  // One tab is not a tab group, and the enhancement needs at least two to do anything.
  assert.equal(group.children.length, 2);
  assert.deepEqual(group.children.map(c => c.type), ['tabitem', 'tabitem']);
  assert.notEqual(group.children[0].id, group.children[1].id);
  assert.deepEqual(group.children[0].props, { title: 'Neuer Tab' });

  assert.equal(canContain(group, { type: 'tabitem' }), true);
  assert.equal(canContain(group, { type: 'text' }), false);
  assert.equal(canContain({ type: 'section', children: [] }, { type: 'tabitem' }), false);
  assert.equal(canContain({ type: 'accordion', children: [] }, { type: 'tabitem' }), false);
  // A tab itself holds ordinary content.
  assert.equal(canContain(group.children[0], { type: 'text' }), true);

  history.undo();
  assert.deepEqual(history.document, fixture());
});

test('free styles inherit from the wider device, reset individually and leave no skeleton', () => {
  const history = new EditorHistory(fixture());
  history.change(doc => setStyle(doc, 's1', 'desktop', 'fontSize', '42px'));
  history.change(doc => setStyle(doc, 's1', 'desktop', 'padding', '80px', { side: 'top' }));
  history.change(doc => setStyle(doc, 's1', 'desktop', 'color', '#ffffff', { hover: true }));
  history.change(doc => setStyle(doc, 's1', 'mobile', 'fontSize', '28px'));
  const block = () => locate(history.document.blocks, 's1').block;

  assert.equal(history.document.schemaVersion, 10);
  // Tablet has no own value, so it inherits the desktop one; mobile keeps its own.
  assert.deepEqual(effectiveStyle(block(), 'tablet', 'fontSize'), { value: '42px', source: 'desktop' });
  assert.deepEqual(effectiveStyle(block(), 'mobile', 'fontSize'), { value: '28px', source: 'mobile' });
  assert.deepEqual(effectiveStyle(block(), 'desktop', 'padding', 'top'), { value: '80px', source: 'desktop' });
  assert.equal(hoverStyle(block(), 'desktop', 'color'), '#ffffff');

  // Clearing one value makes it inherit again and removes the now empty container.
  history.change(doc => setStyle(doc, 's1', 'mobile', 'fontSize', ''));
  assert.equal(block().style.mobile, undefined);
  assert.deepEqual(effectiveStyle(block(), 'mobile', 'fontSize'), { value: '42px', source: 'desktop' });

  // Copying carries the styling over without sharing objects.
  history.change(doc => copyStyle(doc, 's1', 's2'));
  const copy = locate(history.document.blocks, 's2').block;
  assert.deepEqual(copy.style, block().style);
  assert.notEqual(copy.style, block().style);

  history.change(doc => clearStyle(doc, 's1'));
  assert.equal(block().style, undefined);

  // Every step is one history entry, so undoing all of them restores the original document.
  for (let i = 0; i < 7; i++) history.undo();
  assert.deepEqual(history.document, fixture());
});

test('a row arrives with its columns, inside the selected container', () => {
  const history = new EditorHistory(fixture());

  // With a section selected, the row becomes a child of it - that is where people expect it.
  const rowId = history.change(doc => insertRow(doc, 3, 's1'));
  const row = locate(history.document.blocks, rowId);
  assert.equal(row.block.type, 'row');
  assert.equal(row.parent.id, 's1');
  assert.equal(row.block.children.length, 3);
  assert.ok(row.block.children.every(child => child.type === 'column'));
  assert.equal(row.block.layout.design.desktop.columns, 'three');
  assert.equal(row.block.layout.design.mobile.columns, 'one');
  // Column counts live in the design tokens, which need schema v2.
  assert.ok(history.document.schemaVersion >= 2);

  // With a heading selected, the row is placed after it rather than inside it.
  const second = history.change(doc => insertRow(doc, 2, 'h1'));
  const placed = locate(history.document.blocks, second);
  assert.equal(placed.parent.id, 's1');
  assert.equal(placed.siblings[placed.index - 1].id, 'h1');
  assert.equal(placed.block.children.length, 2);

  // Out of range counts are clamped instead of producing nonsense. Two statements, because
  // history.change replaces the document: reading blocks in the same expression reads the old one.
  const wideId = history.change(doc => insertRow(doc, 99, 's2'));
  assert.equal(locate(history.document.blocks, wideId).block.children.length, 6);
  const narrowId = history.change(doc => insertRow(doc, 0, 's2'));
  assert.equal(locate(history.document.blocks, narrowId).block.children.length, 2, 'An unusable number falls back to two.');

  // Each insertion is one history entry.
  for (let i = 0; i < 4; i++) history.undo();
  assert.deepEqual(history.document, fixture());
});

test('the hero preset assembles a full screen section that centres its content', () => {
  const history = new EditorHistory(fixture());
  const id = history.change(doc => insertPreset(doc, 'hero', 's1'));
  const hero = locate(history.document.blocks, id).block;

  assert.equal(hero.type, 'section');
  assert.equal(hero.layout.width, 'full', 'Edge to edge, or it is not full screen.');
  // dvh, not vh: on a phone 100vh is taller than the screen.
  assert.equal(hero.style.desktop.minHeight, '100dvh');
  assert.equal(hero.style.mobile.minHeight, '80dvh');
  assert.equal(hero.style.desktop.display, 'flex');
  assert.equal(hero.style.desktop.alignItems, 'center');
  assert.equal(hero.style.desktop.backgroundSize, 'cover');
  assert.ok(hero.style.desktop.overlayOpacity > 0, 'An overlay, so text stays readable on a photo.');
  assert.deepEqual(hero.children.map(child => child.type), ['heading', 'text', 'button']);
  assert.equal(hero.children[0].props.level, 1);
  // Free styles need schema v10.
  assert.ok(history.document.schemaVersion >= 10);

  history.undo();
  assert.deepEqual(history.document, fixture());
});