import { edge, node } from '../lib/builders.mjs';
import { LANES, pickAssetType } from './lib/scaffold.mjs';

/**
 * Font assets (#74): uploaded like a picture – picked from what the server holds through "+ → Font",
 * or dropped onto the editor – and worn by a text object through its Font row. No font means the
 * editor's own typeface, which is also what a reference that no longer resolves falls back to.
 *
 * The seed puts two DejaVu faces on the server without making assets of them: this step makes them.
 * Everything lives in its own lane (`__gm.lookAt`), because symbols draw above objects and the
 * origin is crowded by what the earlier steps left behind.
 */
const LANE = LANES.font;
const TEXT_ASSET = 'ft-text';
const TEXT_OBJECT = 'ft-obj';
/** The two files the seed uploads, told apart by their exact size rather than by their name. */
const SERIF_BYTES = 380660;
const MONO_BYTES = 343140;
/** How many pixels across the text a check reads. */
const SAMPLE = 120;
const RED_SHADER = {
  id: 'ft-red',
  type: 'shader',
  name: 'Red glyphs',
  props: {},
  graph: {
    nodes: [
      node('ft-red-color', 'ShaderColor', 0, 0, { value: 0xe63c3c }),
      node('ft-red-out', 'ShaderOutput', 260, 0),
    ],
    edges: [edge('ft-red-e1', 'ft-red-color', 'color', 'ft-red-out', 'color')],
  },
};

export async function font(t) {
  const { check, sleep, json, evaluate, mutate, click, clickText, locate, press, play, stop, shot, showTab } =
    t;
  const { select } = t;
  const assetsOfType = (type) =>
    json(`__gm.state.project.assets.filter((a) => a.type === ${JSON.stringify(type)})
      .map((a) => ({ id: a.id, name: a.name, file: a.file }))`);
  const info = () => json(`__gm.textInfo(${JSON.stringify(TEXT_OBJECT)})`);
  /** The overlay is drawn last, so a menu entry wins over a row of the asset list saying the same. */
  const clickLast = async (text) => {
    const p = await locate(text, true);
    await click(p.x, p.y);
  };
  /** A face arrives over the network, so what it changes is awaited rather than slept for. */
  const waitFor = async (read, done, tries = 20) => {
    let value = await read();
    for (let i = 0; i < tries && !done(value); i++) {
      await sleep(150);
      value = await read();
    }
    return value;
  };

  await press('Escape');
  await evaluate('document.activeElement instanceof HTMLElement && document.activeElement.blur()');
  await evaluate('__gm.state.select(null)');
  await showTab('scene');

  // 30a. What the server holds, straight from the API: the two files the seed put there.
  // `evaluate`, not `json`: the latter stringifies the promise itself rather than what it yields.
  const stored = await evaluate(`fetch('/game-maker/api/index.php?r=fonts').then((r) => r.json())`);
  const serif = stored.find((item) => item.bytes === SERIF_BYTES);
  const mono = stored.find((item) => item.bytes === MONO_BYTES);
  check(
    'the server holds the two seeded typefaces, named by their content',
    Boolean(serif && mono) && /^[a-f0-9]{12}\/[a-f0-9]{64}\.ttf$/.test(serif.file),
    JSON.stringify({ serif: serif?.file, mono: mono?.file, count: stored.length }),
  );
  if (!serif || !mono) return;
  // The hash says nothing, so the name the file was uploaded under is kept beside it (#83).
  check(
    'the listing carries the name each file was uploaded under',
    serif.name === 'DejaVuSerif.ttf' && mono.name === 'DejaVuSansMono.ttf',
    JSON.stringify({ serif: serif.name, mono: mono.name }),
  );

  // 30b. "+ → Font" offers them; a font is picked rather than created empty, like a texture.
  await evaluate('__gm.console.clear()');
  await clickText('+');
  await pickAssetType(t, 'Font');
  await sleep(500);
  const picker = await json('__gm.fontPicker()');
  check(
    'the + menu opens the font picker on what the server holds, none of it in the project yet',
    Boolean(picker) && picker.files.includes(serif.file) && picker.used.length === 0,
    JSON.stringify(picker),
  );
  // A row the project does not wear yet is captioned by the file's own name (#83); without it
  // there was nothing to read but its byte count.
  check(
    'a row nobody wears yet is captioned with the name the file was uploaded under',
    picker.captions[picker.files.indexOf(serif.file)] === 'DejaVuSerif.ttf',
    JSON.stringify(picker.captions),
  );
  await shot('30-font-picker');
  // A row is a container holding its background, not a Graphics with children: Pixi v8 warns
  // about the latter, and the warning is the only sign that the rows are built the wrong way.
  const logged = await json('__gm.console.lines()');
  check(
    'building the rows draws no complaint from Pixi',
    !logged.some((line) => /Deprecation/i.test(JSON.stringify(line))),
    JSON.stringify(logged.slice(0, 3)),
  );
  const row = await json(`__gm.fontPickerRow(${JSON.stringify(serif.file)})`);
  await click(row.x, row.y);
  await clickText('Use font');
  const fonts = await assetsOfType('font');
  check(
    'picking a row makes a font asset of that file, named after the file rather than "Font"',
    fonts.length === 1 && fonts[0].file === serif.file && fonts[0].name === 'DejaVuSerif',
    JSON.stringify(fonts),
  );
  if (fonts.length !== 1) return;
  const fontId = fonts[0].id;
  // Renamed away from "Font": the inspector row is called that too, and a lookup by text would
  // find the asset's row in the panel instead of the row being tested.
  await mutate(`__gm.state.project.assets.find((a) => a.id === ${JSON.stringify(fontId)}).name = 'Bookish'`);

  // 30c. A text in its own lane, drawn in the editor's own typeface while it wears no font.
  await mutate(`
    const project = __gm.state.project;
    project.assets.push({ id: ${JSON.stringify(TEXT_ASSET)}, type: 'text', name: 'Title',
      props: { enabled: true, scale: 1, rotation: 0, mirrorX: false, mirrorY: false,
        text: 'Handgloves', font: '', fontSize: 48, color: 0xffffff, align: 'center' } });
    __gm.state.activeScene.objects.push({ id: ${JSON.stringify(TEXT_OBJECT)}, assetId: ${JSON.stringify(TEXT_ASSET)},
      name: '', position: { x: 0, y: ${LANE}, z: 0 }, editorOffset: { x: 0, y: 0 },
      overrides: {}, parentId: '', instanceEdits: {} });
    __gm.lookAt(0, ${LANE});`);
  const plain = await info();
  check(
    'a text wearing no font is drawn in the editor’s own typeface',
    Boolean(plain) && !plain.family.startsWith('gm-font-') && plain.width > 0,
    JSON.stringify(plain),
  );
  if (!plain) return;

  // 30d. Wearing the font, chosen the way a user chooses it: the Font row of the text object.
  await select({ kind: 'object', holderId: 'scene1', objectIds: [TEXT_OBJECT], objectId: TEXT_OBJECT });
  // The label is no anchor on its own: the assets panel has a row per font. Parent and Shader (#169)
  // say "None" as well, so the Font row's dropdown is the "None" at its height.
  const fontRow = await json("__gm.inspectorField('Font', true)");
  const nones = await evaluate(`(() => {
    const out = [];
    const walk = (node) => {
      if (!node.visible) return;
      if (node.text === 'None') out.push(Math.round(node.getBounds().y + node.getBounds().height / 2));
      for (const child of node.children ?? []) walk(child);
    };
    walk(__gm.app.stage);
    return out;
  })()`);
  check(
    'a text has a Font row, and it reads None',
    Boolean(fontRow) && nones.some((y) => Math.abs(y - fontRow.y) < 12),
    JSON.stringify({ fontRow, nones }),
  );
  await click(fontRow.x, fontRow.y);
  await clickLast('Bookish (font)');
  const chosen = await json(
    `__gm.state.activeScene.objects.find((o) => o.id === ${JSON.stringify(TEXT_OBJECT)}).overrides.font`,
  );
  const worn = await waitFor(info, (value) => Boolean(value?.family.startsWith('gm-font-')));
  check(
    'picking it in the Font row redraws the text in that face, and it reflows',
    chosen === fontId && Boolean(worn) && worn.width !== plain.width,
    JSON.stringify({ chosen, plain, worn }),
  );
  await shot('30-font-scene');
  // The asset's own inspector is where a font is looked at; it has nothing else to show.
  await select({ kind: 'asset', assetId: fontId });
  await shot('30-font-asset');

  // 30e. The game draws through the same path, so the face is in play as well. The camera frames
  //      the origin, so the text has to leave its lane for as long as the game runs.
  const place = (expression) =>
    mutate(`
      const scene = __gm.state.activeScene;
      const cam = scene.objects.find((o) => o.id === 'o3').position;
      const text = scene.objects.find((o) => o.id === ${JSON.stringify(TEXT_OBJECT)});
      Object.assign(text.position, ${expression});`);
  await place('{ x: cam.x, y: cam.y }');
  await play();
  await sleep(600);
  const played = await json(`__gm.gameTextInfo(${JSON.stringify(TEXT_OBJECT)})`);
  check(
    'the running game draws the text in the same face',
    Boolean(played?.family.startsWith('gm-font-')) && played.family === worn?.family,
    JSON.stringify(played),
  );
  await stop();
  await place(`{ x: 0, y: ${LANE} }`);

  // 30f. An id that no longer resolves is no font at all – the text falls back rather than vanishing.
  await mutate(
    `__gm.state.activeScene.objects.find((o) => o.id === ${JSON.stringify(TEXT_OBJECT)}).overrides.font = 'no-such-asset'`,
  );
  const dangling = await waitFor(info, (value) => !value?.family.startsWith('gm-font-'));
  check(
    'a dangling font id falls back to the editor’s own typeface, at the width from before',
    dangling?.family === plain.family && dangling?.width === plain.width,
    JSON.stringify(dangling),
  );

  // 30g. Dropping a font file onto the editor uploads it and makes an asset named after the file.
  const dropped = await evaluate(`
    (async () => {
      const bytes = await fetch('/game-maker/data/fonts/${mono.file}').then((r) => r.arrayBuffer());
      const file = new File([bytes], 'DejaVuSansMono.ttf', { type: 'font/ttf' });
      const data = new DataTransfer();
      data.items.add(file);
      const canvas = document.querySelector('canvas');
      canvas.dispatchEvent(new DragEvent('drop', { dataTransfer: data, bubbles: true, cancelable: true }));
      return file.size;
    })()`);
  await waitFor(
    () => assetsOfType('font'),
    (list) => list.length === 2,
  );
  const both = await assetsOfType('font');
  check(
    'a dropped typeface is uploaded and becomes an asset named after the file',
    dropped === MONO_BYTES &&
      both.length === 2 &&
      both.some((a) => a.file === mono.file && a.name === 'DejaVuSansMono'),
    JSON.stringify({ dropped, both, notice: await json('__gm.state.notice') }),
  );

  // 30h. A text wears a shader like a sprite (#169), picked in its own Shader row. The graph paints
  //      every glyph pixel one red and keeps the text's alpha, so no white may survive it.
  const overrides = `__gm.state.activeScene.objects.find((o) => o.id === ${JSON.stringify(TEXT_OBJECT)}).overrides`;
  await mutate(`
    Object.assign(${overrides}, { font: ${JSON.stringify(fontId)} });
    __gm.state.project.assets.push(${JSON.stringify(RED_SHADER)});`);
  await waitFor(info, (value) => Boolean(value?.family.startsWith('gm-font-')));
  /** A run of pixels across the middle of the text, where every glyph is cut. */
  const rowAcross = async (view = 'objectRect') => {
    const r = await json(`__gm.${view}(${JSON.stringify(TEXT_OBJECT)})`);
    return r ? json(`__gm.pixelRow(${Math.round(r.x - SAMPLE / 2)}, ${Math.round(r.y)}, ${SAMPLE})`) : [];
  };
  const channels = (hex) => [1, 3, 5].map((i) => parseInt(hex.slice(i, i + 2), 16));
  // Red is counted by hue, not by the exact colour: drawn small, a glyph's pixels blend into the background.
  const reddish = (hex) => {
    const [r, g, b] = channels(hex);
    return r > 0x60 && r > 2 * g && r > 2 * b;
  };
  const summary = (row) => ({
    red: row.filter(reddish).length,
    white: row.filter((hex) => channels(hex).every((c) => c > 0xd0)).length,
  });
  const white = summary(await rowAcross());
  await select({ kind: 'object', holderId: 'scene1', objectIds: [TEXT_OBJECT], objectId: TEXT_OBJECT });
  const shaderRow = await json("__gm.inspectorField('Shader', true)");
  const noShader = await locate('None', true);
  check(
    'a text has a Shader row below its own, and it reads None',
    Boolean(shaderRow) && Math.abs(noShader.y - shaderRow.y) < 12 && white.white > 0 && white.red === 0,
    JSON.stringify({ shaderRow, noShader, white }),
  );
  await click(shaderRow.x, shaderRow.y);
  await clickLast('Red glyphs (shader)');
  const redInfo = await info();
  const red = summary(await rowAcross());
  check(
    'picking a shader draws the text through it: its glyphs red, none of them white',
    redInfo?.shader === RED_SHADER.id && red.red > 0 && red.white === 0,
    JSON.stringify({ redInfo, red }),
  );
  await shot('30-font-text-shader');

  // 30i. New content is rasterised anew, and the shader stays on it.
  await mutate(`${overrides}.text = 'Handgloves Handgloves'`);
  const longer = await info();
  const redLonger = summary(await rowAcross());
  check(
    'changing the text keeps the shader on the new glyphs',
    longer?.shader === RED_SHADER.id &&
      longer.width > redInfo.width &&
      redLonger.red > 0 &&
      redLonger.white === 0,
    JSON.stringify({ longer, redLonger }),
  );

  // 30i-ii. A shader's Padding gives a text room around its rectangle (#69), in the text's own
  //         units. The graph fills the whole quad here, so the margin shows as red left of the text.
  const shaderGraph = `__gm.state.project.assets.find((a) => a.id === ${JSON.stringify(RED_SHADER.id)}).graph`;
  const filled = (padding) =>
    mutate(`
      const graph = ${shaderGraph};
      graph.nodes = graph.nodes.filter((n) => n.id !== 'ft-red-full');
      graph.edges = graph.edges.filter((e) => e.id !== 'ft-red-e2');
      graph.nodes.push(${JSON.stringify(node('ft-red-full', 'ShaderNumber', 0, 160, { value: 1 }))});
      graph.edges.push(${JSON.stringify(edge('ft-red-e2', 'ft-red-full', 'value', 'ft-red-out', 'alpha'))});
      Object.assign(graph.nodes.find((n) => n.id === 'ft-red-out').params, { edge: 'transparent', padding: ${padding} });`);
  // The red run on the row through the text: where the filled quad begins and ends on screen.
  const redSpan = async () => {
    const r = await json(`__gm.objectRect(${JSON.stringify(TEXT_OBJECT)})`);
    const from = Math.max(0, Math.round(r.x) - 600);
    const row = await json(`__gm.pixelRow(${from}, ${Math.round(r.y)}, 1200)`);
    const red = row.map(reddish);
    return {
      first: from + red.indexOf(true),
      last: from + red.lastIndexOf(true),
      unit: r.w / (await info()).width,
    };
  };
  await evaluate('__gm.state.select(null)');
  await filled(0);
  const textTight = await redSpan();
  await filled(6);
  const textRoomy = await redSpan();
  await shot('30-font-text-padding');
  const reach = 6 * textTight.unit;
  check(
    'a padded shader draws six units past the text’s rectangle on either side, and none further',
    textTight.last > textTight.first &&
      Math.abs(textTight.first - textRoomy.first - reach) <= 2 &&
      Math.abs(textRoomy.last - textTight.last - reach) <= 2,
    JSON.stringify({ textTight, textRoomy, reach }),
  );
  // 30i-iii. A shader's Vertex output moves a text's corners as it does a sprite's (#79), in the
  //          text's own units: six of them to the right, and the filled quad stands six further on.
  await filled(0);
  await mutate(`
    const graph = ${shaderGraph};
    graph.nodes.push(${JSON.stringify(node('ft-red-by', 'ShaderNumber', 0, 320, { value: 6 }))});
    graph.nodes.push(${JSON.stringify(node('ft-red-vout', 'ShaderVertexOutput', 260, 320, { subdivisions: 4 }))});
    graph.edges.push(${JSON.stringify(edge('ft-red-e3', 'ft-red-by', 'value', 'ft-red-vout', 'x'))});`);
  const textMoved = await redSpan();
  check(
    'a Vertex output fed 6 draws the text six units to the right of where it stands',
    Math.abs(textMoved.first - textTight.first - reach) <= 2 &&
      Math.abs(textMoved.last - textTight.last - reach) <= 2,
    JSON.stringify({ textTight, textMoved, reach }),
  );
  await mutate(`
    const graph = ${shaderGraph};
    graph.nodes = graph.nodes.filter((n) => !['ft-red-full', 'ft-red-by', 'ft-red-vout'].includes(n.id));
    graph.edges = graph.edges.filter((e) => !['ft-red-e2', 'ft-red-e3'].includes(e.id));
    Object.assign(graph.nodes.find((n) => n.id === 'ft-red-out').params, { edge: 'clamp', padding: 0 });`);

  // 30j. The game draws a text through the same picture, shader included. In front of everything:
  //      in the chained run, earlier steps leave pictures of their own at the camera.
  await place('{ x: cam.x, y: cam.y, z: 1000 }');
  await play();
  await sleep(600);
  const playedShaded = await json(`__gm.gameTextInfo(${JSON.stringify(TEXT_OBJECT)})`);
  const playedPixels = await rowAcross('gameRect');
  const playedRow = summary(playedPixels);
  check(
    'the running game draws the text through its shader as well',
    playedShaded?.shader === RED_SHADER.id && playedRow.red > 0 && playedRow.white === 0,
    JSON.stringify({
      playedShaded,
      playedRow,
      rect: await json(`__gm.gameRect(${JSON.stringify(TEXT_OBJECT)})`),
      scale: await json('__gm.gameScale()'),
      playedPixels,
    }),
  );
  await stop();
  await place(`{ x: 0, y: ${LANE}, z: 0 }`);

  // 30k. The font's Filter (#169 comment): Nearest rasterises a pixel per unit and magnifies without
  //      smoothing. At scale 4 a sharp glyph is blocks of four screen pixels, a smooth one blends
  //      its edges – so the shortest run of one colour inside the row tells them apart.
  // Nothing selected: the outline of a selected text would cross the row with runs of its own.
  await mutate(`Object.assign(${overrides}, { shader: '', text: 'Hg', fontSize: 16, scale: 4 })`);
  await evaluate('__gm.state.select(null)');
  // The scene's grid shows through where the text is transparent, in runs of its own, so everything
  // darker than the glyphs counts as one background.
  const shortestRun = (pixels) => {
    const row = pixels.map((hex) => (channels(hex)[0] > 0x60 ? hex : 'background'));
    const runs = [];
    let length = 1;
    for (let i = 1; i < row.length; i++) {
      if (row[i] === row[i - 1]) length++;
      else {
        runs.push(length);
        length = 1;
      }
    }
    // The first and the last run are cut off by the ends of the row.
    return Math.min(...runs.slice(1));
  };
  const smoothInfo = await info();
  const smoothRow = await rowAcross();
  const smoothRun = shortestRun(smoothRow);
  await select({ kind: 'asset', assetId: fontId });
  const filterRow = await json("__gm.inspectorField('Filter', true)");
  const linear = await locate('Linear', true);
  check(
    'a font has a Filter row, Linear by default, and its text blends the edges of its glyphs',
    Boolean(filterRow) && Math.abs(linear.y - filterRow.y) < 12 && smoothInfo?.smooth && smoothRun <= 2,
    JSON.stringify({ filterRow, linear, smoothInfo, smoothRun, smoothRow }),
  );
  await click(filterRow.x, filterRow.y);
  await clickLast('Nearest');
  const filter = await json(
    `__gm.state.project.assets.find((a) => a.id === ${JSON.stringify(fontId)}).props.filter`,
  );
  const sharpInfo = await info();
  const sharpRow = await rowAcross();
  const sharpRun = shortestRun(sharpRow);
  check(
    'Nearest draws its text a pixel per unit, magnified in blocks',
    filter === 'nearest' && sharpInfo?.smooth === false && sharpInfo.resolution === 1 && sharpRun >= 3,
    JSON.stringify({ filter, sharpInfo, sharpRun, sharpRow }),
  );
  await shot('30-font-nearest');

  // 30k-ii. …and its texels are hard: rasterised finer and cut at half coverage, so no glyph edge is
  //         left half covered – Chrome on Windows smooths canvas text sideways, whatever the filter.
  //         The fixture's face is no pixel font, so rasterised 1:1 its edges would be half covered here too.
  check(
    'Nearest leaves no half-covered texel in the text, the smooth face does',
    smoothInfo?.partial > 0 && sharpInfo?.partial === 0,
    JSON.stringify({ smooth: smoothInfo?.partial, sharp: sharpInfo?.partial }),
  );

  // 30l. The step takes back everything it made, so the steps after it see the fixture again.
  await mutate(`
    const gone = new Set([${JSON.stringify(TEXT_ASSET)}, ${JSON.stringify(RED_SHADER.id)},
      ...${JSON.stringify(both.map((a) => a.id))}]);
    const project = __gm.state.project;
    project.assets = project.assets.filter((a) => !gone.has(a.id));
    __gm.state.activeScene.objects = __gm.state.activeScene.objects.filter(
      (o) => o.id !== ${JSON.stringify(TEXT_OBJECT)});
    __gm.state.select(null);
    __gm.lookAt(0, 0);`);
  check(
    'the step leaves nothing of its own behind',
    (await assetsOfType('font')).length === 0 && (await info()) === null,
    JSON.stringify(await assetsOfType('font')),
  );
}