export type TeachingLesson = {
  kind?: 'practical' | 'theory';
  id: string;
  group: string;
  title: string;
  summary: string;
  intro: {
    scenario: string;
    startingPoint: string[];
    outcome: string;
  };
  objectives: string[];
  concepts: { title: string; body: string }[];
  steps: {
    title: string;
    body: string;
    expected: string;
    explanation: string;
    code?: string;
    lang?: string;
    filename?: string;
  }[];
  checks: string[];
  pitfalls: { symptom: string; cause: string; fix: string }[];
  exercise: { task: string; hint: string; answer: string };
  refs: { label: string; url: string }[];
  demo?: 'http' | 'async' | 'protocol';
  interview?: {
    question: string;
    answer: string;
    followUps: string[];
  };
  production?: {
    scenario: string;
    decisions: string[];
    failureDrill: string;
    acceptance: string[];
  };
};
export type ReviewItem = {
  id: string;
  title: string;
  prompt: string;
  checkpoints: string[];
  misconception: string;
  revisit: { lessonId: string; label: string }[];
};
export type ReviewLesson = {
  kind: 'review';
  id: string;
  group: string;
  title: string;
  summary: string;
  sourceModule: string;
  intro: {
    scenario: string;
    startingPoint: string[];
    outcome: string;
  };
  questions: ReviewItem[];
  challenges: ReviewItem[];
  mastery: { id: string; text: string; evidence: string }[];
};
export type Lesson = TeachingLesson | ReviewLesson;
export type Video = {
  type: 'file' | 'link';
  url: string;
  title?: string;
  captions?: string;
};