import type { TaskItem } from "../types.ts";
import { CommandError } from "../cli/errors.ts";

export function parseTasks(content: string): TaskItem[] {
  const tasks: TaskItem[] = [];
  const lines = content.split(/\r?\n/);
  for (const line of lines) {
    const match = line.match(/^[\s]*- \[([ xX])\] (.*)$/);
    if (match) {
      tasks.push({
        checked: match[1] !== " ",
        text: match[2],
      });
    }
  }
  return tasks;
}

export class TaskFormatError extends CommandError {
  constructor(message: string) {
    super(message);
    this.name = this.constructor.name;
  }
}

export function validateTaskFormat(content: string): void {
  const tasks = parseTasks(content);
  if (tasks.length === 0) {
    throw new TaskFormatError("task.md 必须包含至少一个 checkbox 项");
  }
  for (const task of tasks) {
    if (task.text.trim() === "") {
      throw new TaskFormatError("task.md 中每个 checkbox 项必须有非空描述");
    }
  }
}