import { LANES, MAKE_OBJECT } from './lib/scaffold.mjs';

/** Draw order: symbols always above sprites, `z` above hierarchy order. */
export async function drawing(t) {
  const { check, json, shot, click, drag, locate, typeText, press, undo, mutate, select, object } = t;
  const orderOfCrates = () => json(`__gm.drawOrder().filter(id => id === 'o1' || id === 'o2')`);

  // 5a. Symbols stay on top: put the camera first in the hierarchy (drawn first) and a crate
  //     right on top of its icon → the icon must still be drawn above the sprite.
  await mutate(`
    const objs = __gm.state.activeScene.objects;
    const cam = objs.splice(objs.findIndex(o => o.id === 'o3'), 1)[0];
    objs.unshift(cam);
    const crate = objs.find(o => o.id === 'o1');
    crate.position.x = 0; crate.position.y = 0;
    __gm.state.select(null)`);
  const layers = await json(`[__gm.layerOf('o3'), __gm.layerOf('o1'), __gm.layerOf('o2')]`);
  check(
    'camera symbol is drawn in the overlay layer above sprites',
    JSON.stringify(layers) === '["overlay","objects","objects"]',
    JSON.stringify(layers),
  );
  await shot('13-symbol-on-top');

  // 5b. Z-order: put both crates on the origin. With equal z the hierarchy order wins
  //     (o1 before o2 → o2 on top); raising o1's z draws it above o2; undo restores it.
  await mutate(
    `const o2 = __gm.state.activeScene.objects.find(o => o.id === 'o2'); o2.position.x = 0; o2.position.y = 0`,
  );
  check(
    'equal z keeps hierarchy order',
    JSON.stringify(await orderOfCrates()) === '["o1","o2"]',
    JSON.stringify(await orderOfCrates()),
  );
  await select({ kind: 'object', holderId: 'scene1', objectId: 'o1' });
  const zLabel = await locate('Z');
  await click(zLabel.x + 160, zLabel.y); // plain click → text editing with everything selected
  await typeText('5');
  await press('Enter');
  check(
    'Z field sets position.z',
    (await object('o1')).position.z === 5,
    `z=${(await object('o1')).position.z}`,
  );
  check(
    'higher z is drawn on top',
    JSON.stringify(await orderOfCrates()) === '["o2","o1"]',
    JSON.stringify(await orderOfCrates()),
  );
  await shot('14-z-order');
  await undo();
  check('undo restores z', (await object('o1')).position.z === 0, `z=${(await object('o1')).position.z}`);

  // 5c. The symbols are the asset panel's icons, white in a dark outline and without a plate
  //     behind them: one of each in a lane of its own, the pixels read on a grid over each icon
  //     (±12 world units round its centre). Each must show white and the outline, and none of the
  //     colours the symbols had before.
  const PLACED = { 's-beh': 'mover', 's-box': 's-box-a', 's-rb': 's-rb-a', 's-cam': 'cam', 's-pt': 's-pt-a' };
  const ids = Object.keys(PLACED);
  await mutate(`
    const p = __gm.state.project;
    const scene = __gm.state.activeScene;
    ${MAKE_OBJECT}
    p.assets.push(
      { id: 's-box-a', type: 'container', name: 's-box-a', props: { enabled: true }, objects: [] },
      { id: 's-rb-a', type: 'rigidbody', name: 's-rb-a', props: { bodyType: 'static' } },
      { id: 's-pt-a', type: 'particles', name: 's-pt-a', props: {}, graph: { nodes: [], edges: [] } },
    );
    Object.entries(${JSON.stringify(PLACED)}).forEach(([id, assetId], i) => {
      const o = make(id, assetId, '', ${LANES.symbols}, id);
      o.position.x = (i - 2) * 120;
      scene.objects.push(o);
    });
    __gm.state.select(null);
    __gm.lookAt(0, ${LANES.symbols});`);
  const looks = await json(`(() => {
    const zoom = __gm.objectRect('s-beh').w / 28;
    const old = ['#b066ff', '#3fb8c9', '#4fd18b', '#c26a1f'];
    const rgb = (c) => [1, 3, 5].map((i) => parseInt(c.slice(i, i + 2), 16));
    const near = (a, b, max) => Math.hypot(...rgb(a).map((v, i) => v - rgb(b)[i])) < max;
    return ${JSON.stringify(ids)}.map((id) => {
      const icon = __gm.sceneIcon(id);
      const seen = { id, white: 0, outline: 0, old: [] };
      for (let dx = -12; dx <= 12; dx += 1.5)
        for (let dy = -12; dy <= 12; dy += 1.5) {
          const got = __gm.pixelAt(Math.floor(icon.screen.x + dx * zoom), Math.floor(icon.screen.y + dy * zoom));
          if (got === '#ffffff') seen.white++;
          // The outline is thin, so at this zoom it is mostly an edge pixel blended into the
          // background (#111216 and the like), rarely the exact #0b0c0f.
          else if (near(got, '#0b0c0f', 20)) seen.outline++;
          else if (old.includes(got)) seen.old.push(got);
        }
      return seen;
    });
  })()`);
  const wrong = looks.filter((s) => s.white < 4 || s.outline < 4 || s.old.length > 0);
  check(
    'every symbol draws its icon white in a dark outline, in none of the old colours',
    wrong.length === 0,
    JSON.stringify(wrong.length ? wrong : looks.map((s) => `${s.id} ${s.white}/${s.outline}`)),
  );
  await shot('15-symbols');
  await mutate(`
    const p = __gm.state.project;
    const scene = __gm.state.activeScene;
    scene.objects = scene.objects.filter((o) => !${JSON.stringify(ids)}.includes(o.id));
    p.assets = p.assets.filter((a) => !['s-box-a', 's-rb-a', 's-pt-a'].includes(a.id));
    __gm.lookAt(0, 0);`);

  // 5d. A pan only moves the camera: no collect and no redraw of every shape per move. What it
  //     leaves on screen – the crate, its outline, the grid – must be what a full redraw draws, and
  //     an object panned back into view must be drawn again.
  await select({ kind: 'object', holderId: 'scene1', objectId: 'o1' });
  const vr = await json('__gm.viewportRect()');
  const cx = Math.round(vr.x + vr.w / 2);
  const cy = Math.round(vr.y + vr.h / 2);
  const info = () => json('__gm.viewportInfo()');
  const rows = () =>
    json(`(() => {
      const r = __gm.objectRect('o1');
      const x = Math.round(r.x - r.w / 2 - 20);
      return [r.y, r.y - r.h / 2 - 2, r.y + r.h / 2 + 2].map((y) => __gm.pixelRow(x, Math.round(y), Math.round(r.w + 40)).join());
    })()`);
  const sameAsRedraw = async () => {
    const panned = await rows();
    await json('(__gm.viewportRedraw(), true)');
    const fresh = await rows();
    return panned.filter((row, i) => row !== fresh[i]).length;
  };
  const before = await info();
  await drag(cx, cy, cx + 36, cy + 24, { steps: 12, button: 'middle' });
  const after = await info();
  const moves = after.cameraMoves - before.cameraMoves;
  const redraws = after.redraws - before.redraws;
  check(
    'a pan moves the camera without redrawing the scene',
    moves >= 8 && redraws <= 4,
    `${moves} camera moves, ${redraws} redraws in 12 steps`,
  );
  const offAfterPan = await sameAsRedraw();
  check('a panned view draws what a full redraw draws', offAfterPan === 0, `${offAfterPan} of 3 rows differ`);
  // Far enough that the crate's right edge passes the view's left one.
  const crate = await json(`__gm.objectRect('o1')`);
  const away = Math.round(crate.x + crate.w / 2 - vr.x + 20);
  await drag(cx, cy, cx - away, cy, { steps: 12, button: 'middle' });
  const gone = !(await json('__gm.drawOrder()')).includes('o1');
  const back0 = await info();
  // Pressed inside the view again: a press out over the panel would pan nothing.
  await drag(cx, cy, cx + away, cy, { steps: 12, button: 'middle' });
  const back = await info();
  const shown = (await json('__gm.drawOrder()')).includes('o1');
  const offAfterReturn = await sameAsRedraw();
  check(
    'an object panned out of view and back is drawn again',
    gone && shown && back.redraws > back0.redraws && offAfterReturn === 0,
    `gone=${gone} shown=${shown} redraws=${back.redraws - back0.redraws} rowsOff=${offAfterReturn}`,
  );
  await shot('15b-panned');
  await mutate(`__gm.state.select(null); __gm.lookAt(0, 0)`);
}