import { type Command, CommandError } from '../../src/core/commands/Command';
import type { ToolHost, ToolResult } from '../../src/editor/agent/agentTools';
import type { AgentView } from '../../src/editor/agent/agentView';
import type { StepTarget } from '../../src/editor/agent/commandCatalog';
import type { SceneFixture } from '../helpers';

/** The editor behind the agent's tools, as the tests drive it: the fixture's project and undo stack. */
export function hostFor(fixture: SceneFixture, deleteAnswer: string | null = null, follows = false) {
  const asked: string[][] = [];
  const shown: StepTarget[] = [];
  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;
    },
    follows: () => follows,
    show: (focus) => shown.push(focus),
  };
  return { host, asked, shown };
}

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