import { colourDistance } from '../lib/harness.mjs';
import { inView } from './lib/scaffold.mjs';

/**
 * Uploading a picture and wearing it. Runs last because it adds an asset and repaints the
 * scene; the checks that count assets live in earlier steps.
 */

/** Paints a four-quadrant PNG in the page and pastes it. The quadrants make the mapping readable. */
const PASTE_IMAGE = `(async () => {
  const canvas = document.createElement('canvas');
  canvas.width = 64;
  canvas.height = 48;
  const g = canvas.getContext('2d');
  g.fillStyle = '#e63c3c'; g.fillRect(0, 0, 32, 24);
  g.fillStyle = '#3cc85a'; g.fillRect(32, 0, 32, 24);
  g.fillStyle = '#466ef0'; g.fillRect(0, 24, 32, 24);
  g.fillStyle = '#f5f5f5'; g.fillRect(32, 24, 32, 24);
  const blob = await new Promise((resolve) => canvas.toBlob(resolve, 'image/png'));
  const transfer = new DataTransfer();
  transfer.items.add(new File([blob], 'pasted.png', { type: 'image/png' }));
  window.dispatchEvent(new ClipboardEvent('paste', { clipboardData: transfer, bubbles: true }));
})()`;

/**
 * A second, plainly different picture. Its only job is to exist on the server under a hash of
 * its own, so the picker has something to offer that the project does not already wear.
 */
const PASTE_SPARE = `(async () => {
  const canvas = document.createElement('canvas');
  canvas.width = 24;
  canvas.height = 24;
  const g = canvas.getContext('2d');
  g.fillStyle = '#ffcc00'; g.fillRect(0, 0, 24, 24);
  g.fillStyle = '#202020'; g.fillRect(6, 6, 12, 12);
  const blob = await new Promise((resolve) => canvas.toBlob(resolve, 'image/png'));
  const transfer = new DataTransfer();
  transfer.items.add(new File([blob], 'spare.png', { type: 'image/png' }));
  window.dispatchEvent(new ClipboardEvent('paste', { clipboardData: transfer, bubbles: true }));
})()`;

export async function textures(t) {
  const { check, sleep, json, evaluate, shot, mutate, press } = t;
  const { api, click, clickText, doubleClick, locate, undo, play, stop } = t;

  // The previous step leaves a picker open and a text field focused, and paste is deliberately
  // ignored while an input has focus, so that Ctrl+V inside a field still edits text.
  await press('Escape');
  await evaluate('document.activeElement instanceof HTMLElement && document.activeElement.blur()');
  await sleep(200);

  // 12a. Pasting an image imports it: uploaded, stored under its hash, and made an asset.
  await evaluate(PASTE_IMAGE);
  await sleep(2500);

  const imported = await json(
    "__gm.state.project.assets.filter((a) => a.type === 'texture').map((a) => ({ id: a.id, name: a.name, file: a.file, w: a.width, h: a.height }))",
  );
  check('pasting an image creates a texture asset', imported.length === 1, JSON.stringify(imported));
  const texture = imported[0] ?? {};
  check(
    'the file is named after its content hash',
    /^[a-f0-9]{64}\.png$/.test(texture.file ?? ''),
    String(texture.file),
  );
  check(
    'the pixel size comes back from the server',
    texture.w === 64 && texture.h === 48,
    JSON.stringify({ w: texture.w, h: texture.h }),
  );

  // 12b. Importing the same picture again reuses the asset: the server hands back the file it
  //      already has, since the name is the content hash.
  await evaluate(PASTE_IMAGE);
  await sleep(2500);
  const again = await json(
    "__gm.state.project.assets.filter((a) => a.type === 'texture').map((a) => a.file)",
  );
  check(
    'the same image imported twice stays one asset on one file',
    again.length === 1,
    JSON.stringify(again),
  );
  check(
    'and the notice says it was already there',
    (await json('__gm.state.notice')) === 'That image is already in the project.',
    JSON.stringify(await json('__gm.state.notice')),
  );

  // 12c. The picture is actually drawn – a sprite wearing it is no longer one flat colour.
  // On a fresh white sprite of its own, so the sample does not depend on eleven steps of edits
  // to the fixture. Cloned rather than written as a literal: a literal missed `editorOffset`,
  // which sent the position to NaN and culled the object without an error.
  await mutate(`
    const project = __gm.state.project;
    const sprite = structuredClone(project.assets.find((a) => a.type === 'sprite'));
    sprite.id = 'tex-sprite';
    sprite.name = 'Textured';
    sprite.props = { ...sprite.props, width: 160, height: 120, color: 0xffffff, texture: ${JSON.stringify(texture.id)} };
    project.assets.push(sprite);

    const scene = __gm.state.activeScene;
    const object = structuredClone(scene.objects.find((o) => o.id === 'otext'));
    object.id = 'otex';
    object.name = 'Textured';
    object.assetId = 'tex-sprite';
    object.overrides = {};
    object.position = { ...object.position, z: 900 };
    scene.objects.push(object);
    __gm.state.select(null)`);
  await sleep(1200);

  const box = await json("__gm.objectRect('otex')");
  check('the textured sprite is on screen', Boolean(box) && box.w > 8, JSON.stringify(box));
  if (box) {
    // The quadrants sit at the corners of the sprite's box; sample well inside each one.
    const at = async (fx, fy) =>
      json(`__gm.pixelAt(${Math.round(box.x + fx * box.w)}, ${Math.round(box.y + fy * box.h)})`);
    const [topLeft, topRight, bottomLeft, bottomRight] = [
      await at(-0.3, -0.3),
      await at(0.3, -0.3),
      await at(-0.3, 0.3),
      await at(0.3, 0.3),
    ];
    const sampled = { topLeft, topRight, bottomLeft, bottomRight };
    check(
      'each quadrant of the picture lands where the picture has it',
      colourDistance(topLeft, '#e63c3c') < 60 &&
        colourDistance(topRight, '#3cc85a') < 60 &&
        colourDistance(bottomLeft, '#466ef0') < 60 &&
        colourDistance(bottomRight, '#f5f5f5') < 60,
      JSON.stringify(sampled),
    );
    check(
      'the sprite is a picture rather than one flat colour',
      new Set(Object.values(sampled)).size === 4,
      JSON.stringify(sampled),
    );
    await shot('32-textured-sprite');

    // 19b-i. Switching the Filter property takes effect at once, without a reload. Read off the
    // screen rather than off `scaleMode`, because the GPU sampler can miss a correctly assigned value.
    const enlarge = (w, h) => `
      const sprite = __gm.state.project.assets.find((a) => a.id === 'tex-sprite');
      sprite.props.width = ${w};
      sprite.props.height = ${h}`;
    await mutate(enlarge(320, 240));
    await sleep(600);
    const wide = await json("__gm.objectRect('otex')");
    // Sampled in the upper half so the line crosses only the red/green border, not the corner
    // where all four quadrants meet.
    const acrossBorder = async () => {
      const y = Math.round(wide.y - wide.h * 0.25);
      const points = [];
      for (let dx = -2; dx <= 2; dx++) {
        points.push(await json(`__gm.pixelAt(${Math.round(wide.x + dx)}, ${y})`));
      }
      return points;
    };
    // Pixels plus what the driver has, so a failure says whether the model, the GPU sampler or the
    // measurement is wrong.
    const sample = async (value) => {
      await mutate(
        `__gm.state.project.assets.find((a) => a.id === ${JSON.stringify(texture.id)}).props.filter = ${JSON.stringify(value)}`,
      );
      await sleep(600);
      const pixels = await acrossBorder();
      return { pixels, filter: await json(`__gm.textureFilter(${JSON.stringify(texture.file)})`) };
    };

    const hard = await sample('nearest');
    const pure = (c) => colourDistance(c, '#e63c3c') < 60 || colourDistance(c, '#3cc85a') < 60;
    check(
      'nearest filtering keeps the border between two quadrants hard',
      hard.pixels.every(pure),
      JSON.stringify(hard),
    );

    const soft = await sample('linear');
    // The drift proves the switch: with a hung one, "some pixel is blended" alone would pass. Measured:
    // a working switch drifts 425, a hung one 0, and 30 even if every channel were off by two.
    const drift = hard.pixels.reduce((sum, c, i) => sum + colourDistance(c, soft.pixels[i]), 0);
    check(
      'switching the filter back to linear blends the border without a reload',
      soft.pixels.some((c) => !pure(c)) && drift > 150,
      JSON.stringify({ drift, nearest: hard, linear: soft }),
    );
    await shot('33-texture-filter-smooth');

    // 12c-ii. A shader draws in the sprite's own pass (#77) and samples the texture itself. At a
    // camera zoom that puts the picture on a fractional pixel grid, it must find the very same
    // nearest-filtered border as the plain draw. Measured in play, where the camera's zoom is the
    // world scale; one play per setting, since the play world is built from the project when it starts.
    await mutate(
      `__gm.state.project.assets.find((a) => a.id === ${JSON.stringify(texture.id)}).props.filter = 'nearest'`,
    );
    const placed = await json(
      "(() => { const o = __gm.state.activeScene.objects.find((o) => o.id === 'otex'); return { x: o.position.x, y: o.position.y }; })()",
    );
    await mutate(`
      const o = __gm.state.activeScene.objects.find((o) => o.id === 'otex');
      o.position.x = 0; o.position.y = 0;
      __gm.state.project.assets.find((a) => a.id === 'cam').props.zoom = 1.37`);
    const played = async (patch) => {
      await mutate(
        `Object.assign(__gm.state.project.assets.find((a) => a.id === 'tex-sprite').props, ${JSON.stringify(patch)})`,
      );
      await play();
      await sleep(500);
      const rect = await json("__gm.gameRect('otex')");
      const y = Math.round(rect.y - rect.h * 0.25);
      const pixels = [];
      for (let dx = -3; dx <= 3; dx++)
        pixels.push(await json(`__gm.pixelAt(${Math.round(rect.x + dx)}, ${y})`));
      await stop();
      return { pixels, scale: rect.w / 320 };
    };
    const bare = await played({ shader: '' });
    const filtered = await played({ shader: 'adjust-colors' });
    const darkened = await played({ shader: 'adjust-colors', brightness: 0.5 });
    check(
      'at a fractional camera zoom the nearest border is still hard in play',
      Number.isInteger(bare.scale) === false && bare.pixels.every(pure),
      JSON.stringify(bare),
    );
    check(
      'a neutral shader draws the very same pixels there: the shader does not resample',
      JSON.stringify(filtered.pixels) === JSON.stringify(bare.pixels),
      JSON.stringify({ bare: bare.pixels, filtered: filtered.pixels }),
    );
    // Without this, "the same" could also mean the shader never ran on that path.
    check(
      'and the shader does run on that path: brightness 0.5 darkens every one of them',
      darkened.pixels.every((c, i) => colourDistance(c, bare.pixels[i]) > 100 && !pure(c)),
      JSON.stringify(darkened),
    );
    // The sprite's picture is a mesh next to its node: put under the Graphics instead, Pixi warns
    // once per page, through `groupCollapsed`, which the panel mirrors since step 27b-ii.
    const complaints = (await json('__gm.console.lines()')).filter((line) => /Deprecation/.test(line.text));
    check('drawing sprites this way raises no Pixi deprecation warning', complaints.length === 0, complaints);
    await mutate(`
      const o = __gm.state.activeScene.objects.find((o) => o.id === 'otex');
      o.position.x = ${placed.x}; o.position.y = ${placed.y};
      __gm.state.project.assets.find((a) => a.id === 'cam').props.zoom = 1;
      const sprite = __gm.state.project.assets.find((a) => a.id === 'tex-sprite');
      sprite.props.shader = ''; delete sprite.props.brightness;
      __gm.state.project.assets.find((a) => a.id === ${JSON.stringify(texture.id)}).props.filter = 'linear'`);
    await mutate(enlarge(160, 120));

    // 12d. The colour multiplies the picture, so a tinted white quadrant stops being white.
    await mutate("__gm.state.project.assets.find((a) => a.id === 'tex-sprite').props.color = 0x3366ff");
    await sleep(600);
    const tinted = await at(0.3, 0.3);
    check(
      'the sprite colour tints the picture',
      colourDistance(tinted, '#f5f5f5') > 100 && colourDistance(tinted, '#3366ff') < 90,
      JSON.stringify({ was: bottomRight, tinted }),
    );

    // 12e. A reference that no longer resolves falls back to the plain colour instead of failing.
    await mutate("__gm.state.project.assets.find((a) => a.id === 'tex-sprite').props.texture = 'gone'");
    await sleep(600);
    const fallback = await at(0.3, 0.3);
    check(
      'a dangling texture falls back to the plain colour',
      colourDistance(fallback, '#3366ff') < 60,
      JSON.stringify({ fallback }),
    );
  }

  // 12e-ii. A texture field offers pictures only (#143). Since #97 an animation is played, not worn,
  //         so the Texture row of a sprite no longer lists one, and an animation id left in the
  //         field by an older project reads as dangling rather than passing for a picture.
  await mutate(`
    __gm.state.project.assets.push(
      { id: 'tex-anim', type: 'animation', name: 'Walk', props: {}, root: '', tracks: [] });
    const worn = __gm.state.project.assets.find((a) => a.id === 'tex-sprite').props;
    window.__texBefore = worn.texture;
    worn.texture = 'tex-anim';
    __gm.state.select({ kind: 'asset', assetId: 'tex-sprite' })`);
  await sleep(400);
  const textureField = await json("__gm.inspectorField('Texture', true)");
  const dangling = await json("__gm.locateAll('tex-anim?')");
  check(
    'an animation id in the Texture row reads as a dangling reference',
    Boolean(textureField) && dangling.length === 1 && Math.abs(dangling[0].y - textureField.y) < 12,
    JSON.stringify({ textureField, dangling }),
  );
  await click(textureField.x, textureField.y);
  await sleep(300);
  const offered = (await json('__gm.menuRows()')) ?? [];
  check(
    'the Texture row offers the picture and no animation',
    offered.includes(texture.name) && !offered.some((row) => row?.includes('(animation)') || row === 'Walk'),
    JSON.stringify(offered),
  );
  await press('Escape');
  await mutate(`
    const assets = __gm.state.project.assets;
    assets.splice(assets.findIndex((a) => a.id === 'tex-anim'), 1);
    assets.find((a) => a.id === 'tex-sprite').props.texture = window.__texBefore;
    __gm.state.select(null)`);
  await sleep(300);

  // 12f. "+ → Texture" offers the pictures the server already holds, unreferenced ones included:
  //      paste a second picture, undo the asset (the file stays), then pick that file in the dialog.
  await evaluate(PASTE_SPARE);
  await sleep(2500);
  const two = await json("__gm.state.project.assets.filter((a) => a.type === 'texture').map((a) => a.file)");
  const spare = two[1] ?? '';
  check(
    'a second picture is stored under a hash of its own',
    two.length === 2 && spare !== two[0],
    JSON.stringify(two),
  );

  await undo();
  const afterUndo = await json(
    "__gm.state.project.assets.filter((a) => a.type === 'texture').map((a) => a.file)",
  );
  check(
    'undoing the import leaves the file on the server with no asset naming it',
    afterUndo.length === 1 && !afterUndo.includes(spare),
    JSON.stringify(afterUndo),
  );

  await evaluate('__gm.console.clear()');
  await clickText('+');
  // By position, not by text: the menu entry "Texture" shares its label with the centre tab, and
  // `locate` would hand back whichever it walked into first.
  const entry = await locate('Texture', true);
  await click(entry.x, entry.y);
  await sleep(1500);
  const picker = await json('__gm.imagePicker()');
  const stored = (await api('textures')).map((item) => item.file);
  check(
    'the Texture entry opens the image picker instead of the file dialog',
    picker !== null,
    JSON.stringify(picker),
  );
  check(
    'it offers exactly the files the server holds',
    JSON.stringify(picker?.files ?? []) === JSON.stringify(stored),
    JSON.stringify({ shown: picker?.files.length, stored: stored.length }),
  );
  check(
    'the picture the project wears is marked as already in it, the dropped one is not',
    (picker?.used ?? []).includes(texture.file) && !(picker?.used ?? []).includes(spare),
    JSON.stringify(picker?.used),
  );
  // The caption: what the project calls a picture it wears, otherwise the name the file was
  // uploaded under (#83). Before that a file nobody wore read as its pixel size and nothing else.
  const captionOf = (file) => (picker?.captions ?? [])[(picker?.files ?? []).indexOf(file)];
  check(
    'an unused file is captioned by its original name, a used one by its asset name',
    captionOf(spare) === 'spare.png' && captionOf(texture.file) === texture.name,
    JSON.stringify({ spare: captionOf(spare), used: captionOf(texture.file), asset: texture.name }),
  );
  await shot('34-image-picker');
  // A tile 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 tiles are built the wrong way.
  const tileComplaints = (await json('__gm.console.lines()')).filter((line) =>
    /Deprecation/i.test(JSON.stringify(line)),
  );
  check('building the tiles draws no complaint from Pixi', tileComplaints.length === 0, tileComplaints);

  // Scrolled into view first: the server holds every picture ever uploaded, so on a long-lived
  // one the spare's tile sits below the dialog's fold, where a click lands on nothing.
  const tileOf = (file) =>
    inView(t, '__gm.imagePickerRect()', `__gm.imagePickerTile(${JSON.stringify(file)})`);
  const tile = await tileOf(spare);
  await click(tile.x, tile.y);
  check(
    'clicking a tile picks that image',
    (await json('__gm.imagePicker()'))?.selected === spare,
    JSON.stringify(await json('__gm.imagePicker()')),
  );
  await shot('35-image-picked');

  await clickText('Use image');
  await sleep(600);
  const adopted = await json(
    "__gm.state.project.assets.filter((a) => a.type === 'texture').map((a) => ({ name: a.name, file: a.file, w: a.width, h: a.height }))",
  );
  check('the dialog closes on the pick', (await json('__gm.imagePicker()')) === null);
  check(
    'the picked file becomes a texture asset, sized from the server record',
    adopted.length === 2 && adopted[1]?.file === spare && adopted[1]?.w === 24 && adopted[1]?.h === 24,
    JSON.stringify(adopted),
  );
  check(
    'and it is named after the file it was uploaded as, not "Texture"',
    adopted[1]?.name === 'spare',
    JSON.stringify(adopted.map((a) => a.name)),
  );

  // 12g. The name beside the file, straight against the API: uploading the same bytes again under
  //      a new name renames it (the user's rule), a path is stripped to its last part, and an
  //      upload carrying no name at all leaves the known one alone rather than erasing it.
  const renamed = await evaluate(`(async () => {
    const bytes = await fetch('/game-maker/data/textures/${spare}').then((r) => r.blob());
    const post = (query) => fetch('/game-maker/api/index.php?r=textures' + query,
      { method: 'POST', headers: { 'Content-Type': 'image/png' }, body: bytes }).then((r) => r.json());
    const evil = await post('&name=' + encodeURIComponent('../../evil/renamed.png'));
    const nameless = await post('');
    await post('&name=spare.png');
    return { evil: evil.name, file: evil.file, nameless: nameless.name };
  })()`);
  check(
    'a second upload renames the file, a path is stripped, and a nameless upload keeps the name',
    renamed.evil === 'renamed.png' && renamed.file === spare && renamed.nameless === 'renamed.png',
    JSON.stringify(renamed),
  );
  check(
    'and the notice says it was added rather than imported',
    (await json('__gm.state.notice')) === 'Added the image to the project.',
    JSON.stringify(await json('__gm.state.notice')),
  );
  // Bytes that are no picture are the caller's mistake: a 422 that says so, not a server error.
  const refusedUpload = await evaluate(`fetch('/game-maker/api/index.php?r=textures&name=x.png',
    { method: 'POST', headers: { 'Content-Type': 'image/png' }, body: 'hello' })
    .then(async (r) => ({ status: r.status, error: (await r.json()).error }))`);
  check(
    'bytes that are no picture are turned away with 422, not a server error',
    refusedUpload.status === 422 && refusedUpload.error === 'Not a readable image',
    JSON.stringify(refusedUpload),
  );

  // Reusing a file already in the project must not make a second asset on it – two assets on one
  // picture would disagree about its filter.
  await clickText('+');
  const entryAgain = await locate('Texture', true);
  await click(entryAgain.x, entryAgain.y);
  await sleep(1500);
  const reopened = await json('__gm.imagePicker()');
  check(
    'the adopted file is marked as in the project when the dialog is opened again',
    (reopened?.used ?? []).includes(spare),
    JSON.stringify(reopened?.used),
  );
  const sameTile = await tileOf(spare);
  await doubleClick(sameTile.x, sameTile.y);
  await sleep(600);
  const afterSecondPick = await json(
    `__gm.state.project.assets.filter((a) => a.file === ${JSON.stringify(spare)}).length`,
  );
  check(
    'double-clicking a picture the project already has keeps it at one asset',
    afterSecondPick === 1 && (await json('__gm.state.notice')) === 'That image is already in the project.',
    JSON.stringify({ assets: afterSecondPick, notice: await json('__gm.state.notice') }),
  );

  // Back to one texture asset, the way the later steps expect the fixture.
  await undo();
  check(
    'undo takes the adopted asset back out',
    (await json("__gm.state.project.assets.filter((a) => a.type === 'texture').length")) === 1,
  );

  // 12g. Right-clicking a texture asset makes a sprite wearing it at the picture's pixel size.
  const entryText = 'Create sprite from texture';
  const spriteRow = await json("__gm.assetRow('crate')");
  await click(spriteRow.x, spriteRow.y, 'right');
  check(
    'a sprite asset does not offer making a sprite from it',
    (await json(`__gm.locate(${JSON.stringify(entryText)}, false)`)) === null,
  );
  await press('Escape');

  const spritesBefore = await json("__gm.state.project.assets.filter((a) => a.type === 'sprite').length");
  const textureRow = await json(`__gm.assetRow(${JSON.stringify(texture.id)})`);
  await click(textureRow.x, textureRow.y, 'right');
  const createEntry = await json(`__gm.locate(${JSON.stringify(entryText)}, false)`);
  check('a texture asset offers making a sprite from it', createEntry !== null);
  if (createEntry) {
    await click(createEntry.x, createEntry.y);
    const made = await json(`(() => {
      const s = __gm.state.selection;
      const a = s && s.kind === 'asset' ? __gm.state.project.assets.find((x) => x.id === s.assetId) : null;
      return a ? { type: a.type, name: a.name, props: a.props } : null;
    })()`);
    check(
      'the new sprite is selected and wears the texture at its pixel size',
      made?.type === 'sprite' &&
        made.props.texture === texture.id &&
        made.props.width === 64 &&
        made.props.height === 48,
      JSON.stringify(made),
    );
    check('it is named after the texture', made?.name === `${texture.name} 2`, JSON.stringify(made?.name));
    await shot('35b-sprite-from-texture');
    await undo();
    check(
      'undo takes the new sprite back out',
      (await json("__gm.state.project.assets.filter((a) => a.type === 'sprite').length")) === spritesBefore,
    );
  }
  // Saved before the next step: one that navigates would hang at the unsaved-changes prompt.
  await t.saved();
}