"""静态页面与资源文件服务。"""

from __future__ import annotations

from http import HTTPStatus
from http.server import BaseHTTPRequestHandler
from pathlib import Path

from group_system.config import STATIC_DIR

CONTENT_TYPES = {
    ".html": "text/html; charset=utf-8",
    ".htm": "text/html; charset=utf-8",
    ".css": "text/css; charset=utf-8",
    ".js": "text/javascript; charset=utf-8",
    ".mjs": "text/javascript; charset=utf-8",
    ".svg": "image/svg+xml",
    ".png": "image/png",
}


def send_text(handler: BaseHTTPRequestHandler, status: int, text: str) -> None:
    body = text.encode("utf-8")
    handler.send_response(status)
    handler.send_header("Content-Type", "text/plain; charset=utf-8")
    handler.send_header("Content-Length", str(len(body)))
    handler.end_headers()
    handler.wfile.write(body)


def serve_file(handler: BaseHTTPRequestHandler, path: Path) -> None:
    path = path if path.is_absolute() else STATIC_DIR / path
    if not path.is_file():
        send_text(handler, HTTPStatus.NOT_FOUND, "Not Found")
        return
    content_type = CONTENT_TYPES.get(path.suffix.lower(), "application/octet-stream")
    content = path.read_bytes()
    handler.send_response(HTTPStatus.OK)
    handler.send_header("Content-Type", content_type)
    handler.send_header("Content-Length", str(len(content)))
    handler.send_header("Cache-Control", "no-cache")
    handler.end_headers()
    handler.wfile.write(content)