import { describe, expect, it } from 'vitest';
import { isKeptVariable } from '../../src/core/model/Asset';
import { findAssetOf, findGraphAsset, type Project } from '../../src/core/model/Project';
import { runTool, type ToolHost } from '../../src/editor/agent/agentTools';
import { makeSpriteScene, type SceneFixture } from '../helpers';
import { hostFor, text } from './agentTestHost';

/** Copying nodes through the agent's tools (#434). */

/**
 * Behavior Walk, placed by hand: a key held moving its owner, a Variables node reading `speed`
 * (kept), a group round key and move, a comment above the Variables node, and a group round the
 * owner alone.
 */
async function walkAndRun(fixture: SceneFixture, host: ToolHost) {
  const steps = [
    { command: 'create_asset', args: { type: 'behavior', name: 'Walk' }, as: 'walk' },
    { command: 'create_asset', args: { type: 'behavior', name: 'Run' }, as: 'run' },
    { command: 'add_variable', args: { asset: '$walk', key: 'speed', kind: 'number' } },
    { command: 'set_variable_kept', args: { asset: '$walk', key: 'speed', kept: true } },
    { command: 'add_node', args: { asset: '$walk', node: 'OnKeyHeld', x: 0, y: 0 }, as: 'key' },
    {
      command: 'add_node',
      args: { asset: '$walk', node: 'Move', params: { dx: -200 }, x: 300, y: 0 },
      as: 'move',
    },
    { command: 'add_node', args: { asset: '$walk', node: 'Owner', x: 0, y: 400 }, as: 'owner' },
    { command: 'add_node', args: { asset: '$walk', node: 'Variables', x: 0, y: 700 }, as: 'vars' },
    { command: 'add_port', args: { asset: '$walk', node: '$vars', key: 'speed' } },
    {
      command: 'connect',
      args: { asset: '$walk', from: { node: '$key', port: 'exec' }, to: { node: '$move', port: 'exec' } },
    },
    {
      command: 'connect',
      args: { asset: '$walk', from: { node: '$key', port: 'dt' }, to: { node: '$move', port: 'dt' } },
    },
    {
      command: 'connect',
      args: {
        asset: '$walk',
        from: { node: '$owner', port: 'object' },
        to: { node: '$move', port: 'object' },
      },
    },
    { command: 'add_group', args: { asset: '$walk', nodes: ['$key', '$move'], title: 'Walk' } },
    { command: 'add_group', args: { asset: '$walk', nodes: ['$owner'], title: 'Who' } },
    { command: 'add_comment', args: { asset: '$walk', nodes: ['$vars'], text: 'How fast' } },
  ];
  const result = await runTool('run_commands', { steps, label: 'walk' }, host);
  expect(result.isError, text(result)).toBeFalsy();
  const walk = findAssetOf(fixture.project, assetNamed(fixture, 'Walk'), 'behavior')!;
  const run = findAssetOf(fixture.project, assetNamed(fixture, 'Run'), 'behavior')!;
  const id = (type: string) => walk.graph.nodes.find((node) => node.type === type)!.id;
  return { walk, run, key: id('OnKeyHeld'), move: id('Move'), owner: id('Owner'), vars: id('Variables') };
}

/** The project as JSON, an empty list of groups or comments as none – undo leaves one, as for Add group. */
function plain(project: Project): string {
  return JSON.stringify(project, (key, value: unknown) =>
    (key === 'groups' || key === 'notes') && Array.isArray(value) && value.length === 0 ? undefined : value,
  );
}

function assetNamed(fixture: SceneFixture, name: string): string {
  return fixture.project.assets.find((asset) => asset.name === name)!.id;
}

describe('copy_nodes', () => {
  it('copies nodes into another behavior with their links, groups, comments and variables', async () => {
    const fixture = makeSpriteScene('Hero');
    const { host } = hostFor(fixture);
    const { walk, run, key, move, vars } = await walkAndRun(fixture, host);
    const before = plain(fixture.project);

    const steps = [
      { command: 'copy_nodes', args: { from: walk.id, nodes: [key, move, vars], to: run.id }, as: 'copy' },
      { command: 'add_node', args: { asset: run.id, node: 'Owner' }, as: 'owner' },
      {
        command: 'connect',
        args: {
          asset: run.id,
          from: { node: '$owner', port: 'object' },
          to: { node: `$copy.${move}`, port: 'object' },
        },
      },
    ];
    const result = await runTool('run_commands', { steps, label: 'copy' }, host);
    expect(result.isError, text(result)).toBeFalsy();

    const graph = findGraphAsset(fixture.project, run.id)!.graph;
    expect(graph.nodes.map((node) => node.type)).toEqual(['OnKeyHeld', 'Move', 'Variables', 'Owner']);
    const [copiedKey, copiedMove, copiedVars] = graph.nodes;
    expect(copiedMove!.params.dx).toBe(-200);
    expect(copiedVars!.ports).toEqual([{ key: 'speed', kind: 'number' }]);
    // The link from the Owner left behind stays behind; the one drawn after the copy is there.
    expect(graph.edges.map((e) => `${e.from.node}.${e.from.port}>${e.to.node}.${e.to.port}`)).toEqual([
      `${copiedKey!.id}.exec>${copiedMove!.id}.exec`,
      `${copiedKey!.id}.dt>${copiedMove!.id}.dt`,
      `${graph.nodes[3]!.id}.object>${copiedMove!.id}.object`,
    ]);
    expect((graph.groups ?? []).map((group) => group.text)).toEqual(['Walk']);
    expect((graph.notes ?? []).map((note) => note.text)).toEqual(['How fast']);

    const { step, ...made } = (result.structuredContent as { made: Record<string, unknown>[] }).made[0]!;
    expect(step).toBe(1);
    expect(made).toMatchObject({
      id: copiedKey!.id,
      [key]: copiedKey!.id,
      [move]: copiedMove!.id,
      [vars]: copiedVars!.id,
    });
    // The first node's copy, three copies by their originals, the group and the comment.
    expect(Object.keys(made)).toHaveLength(6);

    const runNow = findAssetOf(fixture.project, run.id, 'behavior')!;
    expect(runNow.variables.map((v) => [v.key, v.kind])).toEqual([['speed', 'number']]);
    expect(isKeptVariable(runNow, 'speed')).toBe(true);
    // The originals are untouched.
    expect(walk.graph.nodes).toHaveLength(4);

    await runTool('undo', {}, host);
    expect(plain(fixture.project)).toBe(before);
  });

  it('keeps the layout of a copy placed by hand, its top left where it is told', async () => {
    const fixture = makeSpriteScene('Hero');
    const { host } = hostFor(fixture);
    const { walk, key, move } = await walkAndRun(fixture, host);
    const [from, to] = [key, move].map((nodeId) => walk.graph.nodes.find((n) => n.id === nodeId)!);
    const steps = [{ command: 'copy_nodes', args: { from: walk.id, nodes: [move, key], x: 2000, y: 900 } }];
    const result = await runTool('run_commands', { steps, label: 'copy' }, host);
    expect(result.isError, text(result)).toBeFalsy();

    const [copiedKey, copiedMove] = walk.graph.nodes.slice(4);
    const group = walk.graph.groups!.find((g) => g.text === 'Walk' && g.x >= 2000)!;
    expect(Math.min(copiedKey!.x, group.x)).toBe(2000);
    expect(Math.min(copiedKey!.y, group.y)).toBe(900);
    expect(copiedMove!.x - copiedKey!.x).toBe(to!.x - from!.x);
    expect(copiedMove!.y - copiedKey!.y).toBe(to!.y - from!.y);
    // The comment is about the Variables node left behind, the second group about the Owner.
    expect(walk.graph.notes).toHaveLength(1);
    expect(walk.graph.groups).toHaveLength(3);
    // The copy of the first node given answers to "$copy" alone.
    const made = (result.structuredContent as { made: Record<string, string>[] }).made[0]!;
    expect(made.id).toBe(copiedMove!.id);
  });

  it('refuses nodes the other graph cannot hold, and a variable of another kind there', async () => {
    const fixture = makeSpriteScene('Hero');
    const { host } = hostFor(fixture);
    const { walk, run, key, vars } = await walkAndRun(fixture, host);
    const made = await runTool(
      'run_commands',
      {
        steps: [
          { command: 'create_asset', args: { type: 'shader', name: 'Glow' } },
          { command: 'add_variable', args: { asset: run.id, key: 'speed', kind: 'text' } },
        ],
        label: 'more',
      },
      host,
    );
    expect(made.isError, text(made)).toBeFalsy();
    const before = JSON.stringify(fixture.project);
    const shader = assetNamed(fixture, 'Glow');

    const intoShader = await runTool(
      'run_commands',
      { steps: [{ command: 'copy_nodes', args: { from: walk.id, nodes: [key], to: shader } }], label: 'x' },
      host,
    );
    expect(intoShader.isError).toBe(true);
    expect(text(intoShader)).toContain(`Glow cannot hold`);
    expect(text(intoShader)).toContain(`(${key}) – leave them out`);

    const clash = await runTool(
      'run_commands',
      { steps: [{ command: 'copy_nodes', args: { from: walk.id, nodes: [vars], to: run.id } }], label: 'x' },
      host,
    );
    expect(clash.isError).toBe(true);
    expect(text(clash)).toContain('"speed" is a number in Walk but a text in Run');
    expect(JSON.stringify(fixture.project)).toBe(before);
  });
});