import os
from flask import Blueprint, jsonify, current_app, send_from_directory
from ..services.markdown_service import (
    convert_markdown_to_html, wrap_with_styles,
    save_html, copy_images
)

bp = Blueprint("markdown", __name__)

@bp.route("/<course_id>-<filename>-markdown", methods=["GET"])
def convert_md(course_id, filename):
    md_file_path = os.path.join(current_app.config["MARKDOWN_DIR"], course_id, f"{filename}.md")

    if not os.path.exists(md_file_path):
        return jsonify({"error": "Markdown file not found"}), 404

    # 转换 markdown -> html
    html = convert_markdown_to_html(md_file_path)
    html_with_styles = wrap_with_styles(html)

    # 保存 HTML 文件到 static
    html_output_path = os.path.join(current_app.config["STATIC_DIR"], f"{filename}.html")
    save_html(html_with_styles, html_output_path)

    # 拷贝图片资源
    image_source = os.path.join(current_app.config["MARKDOWN_DIR"], course_id, current_app.config["IMAGE_DIR"], filename)
    image_target = os.path.join(current_app.config["STATIC_DIR"], current_app.config["IMAGE_DIR"], filename)
    copy_images(image_source, image_target)

    return jsonify({"html_url": f"/static/{filename}.html"})

# 提供静态文件访问
@bp.route("/static/<path:filename>")
def serve_static(filename):
    return send_from_directory(current_app.config["STATIC_DIR"], filename)