"""统一解析调度器，负责根据输入类型选择合适的 reader 进行解析。"""

import argparse
import sys
from typing import List, Optional, Tuple

from scripts.core.exceptions import FileDetectionError, ReaderNotFoundError
from scripts.core.markdown import (
    normalize_markdown_whitespace,
    remove_markdown_images,
)
from scripts.readers import BaseReader


def parse_input(
    input_path: str,
    readers: List[BaseReader],
) -> Tuple[Optional[str], List[str]]:
    """
    统一解析入口函数，遍历 readers 选择合适的 reader 进行解析。

    返回: (content, failures)
    - content: 成功时返回 Markdown 内容，失败时返回 None
    - failures: 各解析器的失败原因列表
    """
    if not input_path:
        raise FileDetectionError("输入路径不能为空")

    for reader in readers:
        if reader.supports(input_path):
            return reader.parse(input_path)

    raise ReaderNotFoundError(f"未找到支持的 reader: {input_path}")


def process_content(content: str) -> str:
    """处理解析后的 Markdown 内容"""
    content = remove_markdown_images(content)
    content = normalize_markdown_whitespace(content)
    return content


def output_result(
    content: str,
    args: argparse.Namespace,
) -> None:
    """根据命令行参数输出结果"""
    if args.count:
        print(len(content.replace("\n", "")))
    elif args.lines:
        print(len(content.split("\n")))
    elif args.titles:
        from scripts.core.markdown import extract_titles

        titles = extract_titles(content)
        for title in titles:
            print(title)
    elif args.title_content:
        from scripts.core.markdown import extract_title_content

        title_content = extract_title_content(content, args.title_content)
        if title_content is None:
            print(f"错误: 未找到标题 '{args.title_content}'")
            sys.exit(1)
        print(title_content, end="")
    elif args.search:
        from scripts.core.markdown import search_markdown

        search_result = search_markdown(content, args.search, args.context)
        if search_result is None:
            print(f"错误: 正则表达式无效或未找到匹配: '{args.search}'")
            sys.exit(1)
        print(search_result, end="")
    else:
        print(content, end="")