import { describe, expect, it } from 'vitest';
import { type Command, CommandError } from '../../src/core/commands/Command';
import { findGraphAsset } from '../../src/core/model/Project';
import { argProblem } from '../../src/editor/agent/argCheck';
import { runTool, type ToolHost, type ToolResult } from '../../src/editor/agent/agentTools';
import type { AgentView } from '../../src/editor/agent/agentView';
import { COMMANDS } from '../../src/editor/agent/commandCatalog';
import { NODE_STEP } from '../../src/editor/agent/editPlan';
import TOOLS from '../../src/editor/agent/tools.json';
import { makeBehavior, makeSpriteScene, type SceneFixture } from '../helpers';

/** What an agent changes and reads through the tools (#429, stage 2). */

function hostFor(fixture: SceneFixture, deleteAnswer: string | null = null) {
  const asked: string[][] = [];
  const host: ToolHost = {
    view: () => ({ play: 'editing' }) as AgentView,
    screenshot: () => Promise.resolve({ data: '', width: 0, height: 0 }),
    project: () => fixture.project,
    execute: (command: Command) => {
      try {
        fixture.stack.execute(command);
        return null;
      } catch (error) {
        if (error instanceof CommandError) return error.message;
        throw error;
      }
    },
    confirmDeletes: (ids) => {
      asked.push([...ids]);
      return Promise.resolve(deleteAnswer);
    },
    open: () => null,
    select: () => null,
    play: () => null,
    undo: () => {
      const label = fixture.stack.undoLabel;
      if (label !== null) fixture.stack.undo();
      return label;
    },
    redo: () => {
      const label = fixture.stack.redoLabel;
      if (label !== null) fixture.stack.redo();
      return label;
    },
  };
  return { host, asked };
}

const text = (result: ToolResult) =>
  result.content.map((item) => (item.type === 'text' ? item.text : '')).join('\n');

/** An object that walks left while the left arrow is held: behavior, placement, three nodes, three edges. */
function walkLeft(fixture: SceneFixture) {
  return [
    { command: 'create_asset', args: { type: 'behavior', name: 'Walk' }, as: 'walk' },
    {
      command: 'place_asset',
      args: { in: fixture.sceneId, asset: fixture.spriteId, x: 100, y: 50 },
      as: 'player',
    },
    {
      command: 'place_asset',
      args: { in: fixture.sceneId, asset: '$walk', x: 100, y: 50, parent: '$player' },
    },
    {
      command: 'add_node',
      args: { asset: '$walk', node: 'OnKeyHeld', params: { key: 'ArrowLeft' } },
      as: 'key',
    },
    { command: 'add_node', args: { asset: '$walk', node: 'Move', params: { dx: -200 } }, as: 'move' },
    { command: 'add_node', args: { asset: '$walk', node: 'Owner' }, as: 'owner' },
    {
      command: 'connect',
      args: { asset: '$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' },
      },
    },
  ];
}

describe('run_commands', () => {
  it('builds an object with a behavior in one call, as one undo step that takes all of it back', async () => {
    const fixture = makeSpriteScene('Hero');
    const { host } = hostFor(fixture);
    const before = JSON.stringify(fixture.project);
    const result = await runTool('run_commands', { steps: walkLeft(fixture), label: 'walk left' }, host);
    expect(result.isError).toBeFalsy();
    expect(fixture.stack.undoLabel).toBe('Agent: walk left');

    const behavior = fixture.project.assets.find((asset) => asset.name === 'Walk')!;
    const graph = findGraphAsset(fixture.project, behavior.id)!.graph;
    expect(graph.nodes.map((node) => node.type)).toEqual(['OnKeyHeld', 'Move', 'Owner']);
    expect(graph.nodes[0]!.params.key).toBe('ArrowLeft');
    expect(graph.nodes[1]!.params.dx).toBe(-200);
    expect(graph.edges.map((edge) => `${edge.from.port}>${edge.to.port}`)).toEqual([
      'exec>exec',
      'dt>dt',
      'object>object',
    ]);
    const scene = fixture.sceneOf();
    const [player, walk] = scene.objects;
    expect(walk).toMatchObject({ assetId: behavior.id, parentId: player!.id });
    expect(text(result)).toContain(`Step 1 made {"id":"${behavior.id}"}`);

    const after = JSON.stringify(fixture.project);
    expect(text(await runTool('undo', {}, host))).toBe('Undone: Agent: walk left.');
    expect(JSON.stringify(fixture.project)).toBe(before);
    await runTool('redo', {}, host);
    expect(JSON.stringify(fixture.project)).toBe(after);
  });

  it('places nodes given no place side by side, right of those the graph has', async () => {
    const fixture = makeSpriteScene();
    const behavior = makeBehavior(fixture, 'Jump');
    const { host } = hostFor(fixture);
    await runTool(
      'run_commands',
      { steps: [{ command: 'add_node', args: { asset: behavior.id, node: 'OnStart', x: 40, y: 80 } }] },
      host,
    );
    await runTool(
      'run_commands',
      {
        steps: [
          { command: 'add_node', args: { asset: behavior.id, node: 'Owner' } },
          { command: 'add_node', args: { asset: behavior.id, node: 'Move' } },
        ],
      },
      host,
    );
    expect(behavior.graph.nodes.map(({ x, y }) => [x, y])).toEqual([
      [40, 80],
      [40 + NODE_STEP, 80],
      [40 + 2 * NODE_STEP, 80],
    ]);
  });

  it('changes nothing when a step fails, and names the step and why', async () => {
    const fixture = makeSpriteScene();
    const { host } = hostFor(fixture);
    const before = JSON.stringify(fixture.project);
    const steps = walkLeft(fixture);
    steps[7] = {
      command: 'connect',
      args: { asset: '$walk', from: { node: '$key', port: 'dt' }, to: { node: '$move', port: 'exec' } },
    };
    const result = await runTool('run_commands', { steps }, host);
    expect(result.isError).toBe(true);
    expect(text(result)).toBe('Nothing was changed. Step 8 (connect): Cannot connect number to exec');
    expect(JSON.stringify(fixture.project)).toBe(before);
    expect(fixture.stack.canUndo).toBe(true); // the fixture's own two assets, nothing of the agent's
    expect(fixture.stack.undoLabel).not.toMatch(/^Agent/);
  });

  it('checks every step’s arguments against its command, and refuses an unknown command or node', async () => {
    const fixture = makeSpriteScene();
    const behavior = makeBehavior(fixture);
    const { host } = hostFor(fixture);
    const one = async (step: object) => text(await runTool('run_commands', { steps: [step] }, host));
    expect(await one({ command: 'rename_asset', args: { asset: fixture.spriteId } })).toBe(
      'Nothing was changed. Step 1 (rename_asset): args.name is missing',
    );
    expect(await one({ command: 'create_asset', args: { type: 'texture', name: 'T' } })).toMatch(
      /Step 1 \(create_asset\): args\.type has to be one of scene, /,
    );
    expect(await one({ command: 'teleport', args: {} })).toMatch(/Step 1 \(teleport\): no such command/);
    expect(await one({ command: 'add_node', args: { asset: behavior.id, node: 'Fly' } })).toMatch(
      /Step 1 \(add_node\): A behavior graph has no node "Fly" – look it up with catalog/,
    );
    expect(
      await one({ command: 'rename_asset', args: { asset: fixture.spriteId, name: 'X', colour: 1 } }),
    ).toMatch(/args has no colour/);
    expect(text(await runTool('run_commands', { steps: [] }, host))).toBe(
      'arguments.steps needs at least 1 item(s)',
    );
  });

  it('finds a node by its label too, and keeps a typed-in input value as given', async () => {
    const fixture = makeSpriteScene();
    const behavior = makeBehavior(fixture);
    const { host } = hostFor(fixture);
    await runTool(
      'run_commands',
      { steps: [{ command: 'add_node', args: { asset: behavior.id, node: 'on key held' } }] },
      host,
    );
    expect(behavior.graph.nodes.map((node) => node.type)).toEqual(['OnKeyHeld']);
  });

  it('asks the user before deleting an asset that was there, and does nothing on a no', async () => {
    const fixture = makeSpriteScene();
    const no = hostFor(fixture, 'The user said no; nothing was changed.');
    const deleting = { steps: [{ command: 'delete_asset', args: { asset: fixture.spriteId } }] };
    const refused = await runTool('run_commands', deleting, no.host);
    expect(no.asked).toEqual([[fixture.spriteId]]);
    expect(text(refused)).toBe('The user said no; nothing was changed.');
    expect(fixture.project.assets.some((asset) => asset.id === fixture.spriteId)).toBe(true);

    const yes = hostFor(fixture);
    await runTool('run_commands', deleting, yes.host);
    expect(fixture.project.assets.some((asset) => asset.id === fixture.spriteId)).toBe(false);

    // What the agent made in the same call is its own to take away again.
    const own = hostFor(fixture);
    await runTool(
      'run_commands',
      {
        steps: [
          { command: 'create_asset', args: { type: 'sprite', name: 'Tmp' }, as: 'tmp' },
          { command: 'delete_asset', args: { asset: '$tmp' } },
        ],
      },
      own.host,
    );
    expect(own.asked).toEqual([]);
  });

  it('refuses a name for a step that makes nothing, or a part a step did not make', async () => {
    const fixture = makeSpriteScene();
    const { host } = hostFor(fixture);
    const rename = { command: 'rename_asset', args: { asset: fixture.spriteId, name: 'A' }, as: 'r' };
    expect(text(await runTool('run_commands', { steps: [rename] }, host))).toMatch(
      /Step 1 \(rename_asset\): makes nothing a later step could call "r"/,
    );
    const steps = [
      { command: 'create_asset', args: { type: 'sprite', name: 'S' }, as: 's' },
      { command: 'rename_asset', args: { asset: '$s.closing', name: 'T' } },
    ];
    expect(text(await runTool('run_commands', { steps }, host))).toMatch(
      /Step 2 \(rename_asset\): "\$s.closing": that step made no closing/,
    );
  });
});

describe('reading', () => {
  it('get_graph lists each node’s ports as they are, and the edges', async () => {
    const fixture = makeSpriteScene();
    const { host } = hostFor(fixture);
    await runTool('run_commands', { steps: walkLeft(fixture) }, host);
    const walk = fixture.project.assets.find((asset) => asset.name === 'Walk')!;
    const graph = (await runTool('get_graph', { asset: walk.id }, host)).structuredContent as {
      nodes: { type: string; inputs: { key: string; type: string }[] }[];
      edges: unknown[];
    };
    expect(graph.edges).toHaveLength(3);
    expect(graph.nodes.find((node) => node.type === 'Move')!.inputs.map((port) => port.key)).toEqual([
      'exec',
      'object',
      'dx',
      'dy',
      'scale',
      'dt',
    ]);
  });

  it('get_asset counts a graph instead of spelling it out, and names a scene’s objects', async () => {
    const fixture = makeSpriteScene('Hero');
    const { host } = hostFor(fixture);
    await runTool('run_commands', { steps: walkLeft(fixture) }, host);
    const walk = fixture.project.assets.find((asset) => asset.name === 'Walk')!;
    const asset = (await runTool('get_asset', { asset: walk.id }, host)).structuredContent as Record<
      string,
      unknown
    >;
    expect(asset.graph).toEqual({ nodes: 3, edges: 3, read: 'get_graph' });
    const scene = (await runTool('get_asset', { asset: fixture.sceneId }, host)).structuredContent as {
      objects: { name: string }[];
    };
    expect(scene.objects.map((object) => object.name)).toEqual(['Hero', 'Walk']);
    expect(text(await runTool('get_asset', { asset: 'nope' }, host))).toMatch(/There is no asset nope/);
  });

  it('list_assets filters by type and name', async () => {
    const fixture = makeSpriteScene('Hero');
    makeBehavior(fixture, 'Jump');
    const { host } = hostFor(fixture);
    const listed = (query: Record<string, unknown>) =>
      runTool('list_assets', query, host).then(
        (r) => (r.structuredContent as { assets: { name: string }[] }).assets,
      );
    expect((await listed({})).map((asset) => asset.name)).toEqual(['Level', 'Hero', 'Jump']);
    expect((await listed({ type: 'behavior' })).map((asset) => asset.name)).toEqual(['Jump']);
    expect((await listed({ query: 'he' })).map((asset) => asset.name)).toEqual(['Hero']);
  });

  it('the node catalog of a graph answers a search in full, and lists every node without one', async () => {
    const fixture = makeSpriteScene();
    const behavior = makeBehavior(fixture);
    const { host } = hostFor(fixture);
    const nodes = async (query?: string) =>
      (
        (await runTool('catalog', { topic: 'nodes', asset: behavior.id, ...(query ? { query } : {}) }, host))
          .structuredContent as { nodes: { id: string; inputs?: unknown[]; settings?: { key: string }[] }[] }
      ).nodes;
    const found = await nodes('key held');
    expect(found[0]).toMatchObject({ id: 'OnKeyHeld', inputs: [] });
    expect(found[0]!.settings!.map((setting) => setting.key)).toContain('key');
    const all = await nodes();
    expect(all.some((entry) => entry.id === 'Move')).toBe(true);
    expect(all[0]!.inputs).toBeUndefined();
    expect(text(await runTool('catalog', { topic: 'nodes' }, host))).toMatch(/Name the graph asset/);
  });
});

describe('the catalog', () => {
  it('has every command once, each with arguments the check understands', async () => {
    const names = COMMANDS.map((command) => command.name);
    expect(new Set(names).size).toBe(names.length);
    for (const command of COMMANDS) {
      expect(command.args).toMatchObject({ type: 'object', additionalProperties: false });
      expect(argProblem(command.args, {})).toMatch(/is missing|^null$/);
    }
    const fixture = makeSpriteScene();
    const listed = (await runTool('catalog', { topic: 'commands' }, hostFor(fixture).host))
      .structuredContent as {
      commands: { name: string }[];
    };
    expect(listed.commands.map((command) => command.name)).toEqual(names);
  });

  it('the tools are the ones the relay lists, each with a schema', () => {
    expect(TOOLS.map((tool) => tool.name)).toEqual([
      'get_view',
      'screenshot',
      'list_assets',
      'get_asset',
      'get_graph',
      'catalog',
      'run_commands',
      'open',
      'select',
      'play',
      'undo',
      'redo',
    ]);
    for (const tool of TOOLS)
      expect(tool.inputSchema).toMatchObject({ type: 'object', additionalProperties: false });
  });
});

describe('argProblem', () => {
  it('names the place of the first problem', () => {
    const schema = {
      type: 'object' as const,
      properties: {
        at: { type: 'array' as const, items: { type: 'integer' as const, minimum: 0 } },
        kind: { type: 'string' as const, enum: ['a', 'b'] },
      },
      required: ['kind'],
      additionalProperties: false as const,
    };
    expect(argProblem(schema, { kind: 'a', at: [1, 2] })).toBeNull();
    expect(argProblem(schema, { kind: 'c' })).toBe('arguments.kind has to be one of a, b');
    expect(argProblem(schema, { kind: 'a', at: [1, -1] })).toBe('arguments.at[1] has to be 0 or more');
    expect(argProblem(schema, { kind: 'a', at: [1.5] })).toBe('arguments.at[0] has to be a whole number');
    expect(argProblem(schema, [])).toBe('arguments has to be an object');
  });
});