import { describe, expect, it } from 'vitest';
import { applyOutlineFallbacks, changeOutlineType } from '@openmaic/generation';
import type { SceneOutline } from '@/lib/types/generation';

const base: SceneOutline = {
  id: 'a',
  type: 'slide',
  title: 'Photosynthesis',
  description: 'How plants make food',
  keyPoints: ['light', 'water', 'CO2'],
  order: 1,
};

describe('changeOutlineType', () => {
  it('seeds widget config when switching to interactive', () => {
    const r = changeOutlineType(base, 'interactive');
    expect(r.type).toBe('interactive');
    expect(r.widgetType).toBe('simulation');
    expect(r.widgetOutline?.concept).toBe('Photosynthesis');
  });

  it('seeds pblConfig from shared fields when switching to pbl', () => {
    const r = changeOutlineType(base, 'pbl');
    expect(r.type).toBe('pbl');
    expect(r.pblConfig?.projectTopic).toBe('Photosynthesis');
    expect(r.pblConfig?.projectDescription).toBe('How plants make food');
    expect(r.pblConfig?.targetSkills).toEqual(['light', 'water', 'CO2']);
  });

  it('strips foreign config when switching away', () => {
    const interactive = changeOutlineType(base, 'interactive');
    const slide = changeOutlineType(interactive, 'slide');
    expect(slide.type).toBe('slide');
    expect(slide.widgetType).toBeUndefined();
    expect(slide.widgetOutline).toBeUndefined();
  });

  it('seeds default quizConfig when switching to quiz', () => {
    const r = changeOutlineType(base, 'quiz');
    expect(r.quizConfig).toEqual({
      questionCount: 3,
      difficulty: 'medium',
      questionTypes: ['single'],
    });
  });

  it('keeps an existing valid pblConfig instead of overwriting', () => {
    const withPbl = changeOutlineType(
      {
        ...base,
        type: 'pbl',
        pblConfig: {
          projectTopic: 'Custom',
          projectDescription: 'd',
          targetSkills: ['x'],
          scenarioRoleplay: true,
          scenarioBrief: 'A realistic conversation.',
        },
      },
      'pbl',
    );
    expect(withPbl.pblConfig?.projectTopic).toBe('Custom');
    expect(withPbl.pblConfig?.scenarioRoleplay).toBe(true);
    expect(withPbl.pblConfig?.scenarioBrief).toBe('A realistic conversation.');
  });

  it('preserves shared fields', () => {
    const r = changeOutlineType(base, 'pbl');
    expect(r.id).toBe('a');
    expect(r.title).toBe('Photosynthesis');
    expect(r.order).toBe(1);
  });

  // The bug-fix invariant: editor-produced interactive/pbl outlines must survive
  // applyOutlineFallbacks (which otherwise degrades config-less ones to slide).
  it('produces outlines that survive applyOutlineFallbacks', () => {
    expect(applyOutlineFallbacks(changeOutlineType(base, 'interactive'), true).type).toBe(
      'interactive',
    );
    expect(applyOutlineFallbacks(changeOutlineType(base, 'pbl'), true).type).toBe('pbl');
  });

  it('preserves an existing procedural-skill widget config instead of downgrading it', () => {
    const proc = changeOutlineType(
      {
        ...base,
        type: 'interactive',
        widgetType: 'procedural-skill',
        widgetOutline: {
          concept: 'Brake repair',
          procedureType: 'repair',
          steps: ['loosen', 'replace'],
        },
      },
      'interactive',
    );
    expect(proc.widgetType).toBe('procedural-skill');
    expect(proc.widgetOutline?.steps).toEqual(['loosen', 'replace']);
  });

  it('is a no-op when the type is unchanged (preserves non-seeded fields)', () => {
    const interactive: SceneOutline = {
      ...base,
      type: 'interactive',
      widgetType: 'simulation',
      widgetOutline: { concept: 'X' },
      interactiveConfig: { conceptName: 'X', conceptOverview: 'o', designIdea: 'd' },
    };
    // Same reference back — re-selecting the current type touches nothing.
    expect(changeOutlineType(interactive, 'interactive')).toBe(interactive);

    const partialPbl: SceneOutline = {
      ...base,
      type: 'pbl',
      pblConfig: { projectTopic: '', projectDescription: 'keep me', targetSkills: ['s'] },
    };
    const r = changeOutlineType(partialPbl, 'pbl');
    expect(r.pblConfig?.projectDescription).toBe('keep me');
    expect(r.pblConfig?.targetSkills).toEqual(['s']);
  });

  it('dedupes and caps seeded pbl targetSkills', () => {
    const many = changeOutlineType(
      { ...base, keyPoints: ['a', 'a', 'b', 'c', 'd', 'e', 'f', 'g'] },
      'pbl',
    );
    expect(many.pblConfig?.targetSkills).toEqual(['a', 'b', 'c', 'd', 'e', 'f']);
  });
});