import type { Lesson, TopicsConfig, Topic, Section } from '../types/lesson';

const modules = import.meta.glob('../../../content/**/*.json', { eager: true });

function getModule<T>(path: string): T | null {
  const entry = modules[path];
  if (!entry) return null;
  // Vite eager imports have a `default` property for JSON files
  const mod = entry as { default?: T } & T;
  return mod.default ?? (entry as T);
}

export function getSections(): Section[] {
  const config = getModule<TopicsConfig>('../../../content/topics.json');
  return config?.sections ?? [];
}

export function getTopics(): Topic[] {
  const config = getModule<TopicsConfig>('../../../content/topics.json');
  return config?.topics ?? [];
}

export function getLesson(topicId: string, lessonId: string): Lesson | null {
  // Try common path patterns
  const paths = [
    `../../../content/${topicId}/${lessonId}.json`,
    `../../../content/lessons/${topicId}/${lessonId}.json`,
    `../../../content/${topicId}/lessons/${lessonId}.json`,
  ];

  for (const path of paths) {
    const lesson = getModule<Lesson>(path);
    if (lesson) return lesson;
  }

  // Fallback: search through all modules for matching lesson
  for (const [path, mod] of Object.entries(modules)) {
    if (path.endsWith('.json') && !path.endsWith('topics.json')) {
      const data = (mod as { default?: Lesson }).default ?? (mod as Lesson);
      if (data.id === lessonId && data.topicId === topicId) {
        return data;
      }
    }
  }

  return null;
}

export function getLessonsForTopic(topicId: string): Lesson[] {
  const lessons: Lesson[] = [];

  for (const [path, mod] of Object.entries(modules)) {
    if (path.endsWith('.json') && !path.endsWith('topics.json')) {
      const data = (mod as { default?: Lesson }).default ?? (mod as Lesson);
      if (data.topicId === topicId) {
        lessons.push(data);
      }
    }
  }

  return lessons;
}