#!/bin/bash
# GiteaHubSync CGI 入口：把控制面板（127.0.0.1:8899）代理到飞牛同源路径下，
# 使桌面图标 iframe 可以直接打开面板（避免 http/https 混合内容问题）。
# 完整转发 HTTP 方法、Content-Type 与请求体（POST /api/toggle、/api/sync 等）。
PANEL="http://127.0.0.1:8899"
APP_SLUG="GiteaHubSync"

URI_NO_QUERY="${REQUEST_URI%%\?*}"
REL_PATH="/"
case "$URI_NO_QUERY" in
    *index.cgi*) REL_PATH="${URI_NO_QUERY#*index.cgi}" ;;
esac
REL_PATH="${REL_PATH#/}"
[ -z "$REL_PATH" ] && REL_PATH="/"
case "$REL_PATH" in /*) ;; *) REL_PATH="/$REL_PATH" ;; esac

METHOD="${REQUEST_METHOD:-GET}"
CTYPE="${CONTENT_TYPE:-application/json}"

HDR="$(mktemp)"; BODY="$(mktemp)"; INBODY=""
CURL_ARGS=(-s -m 120 -X "$METHOD" -H "Content-Type: $CTYPE")
case "$METHOD" in
    POST|PUT|PATCH)
        CL="${CONTENT_LENGTH:-0}"
        if [ "$CL" -gt 0 ] 2>/dev/null; then
            INBODY="$(mktemp)"
            head -c "$CL" > "$INBODY"
            CURL_ARGS+=(--data-binary "@$INBODY")
        fi
        ;;
esac

curl "${CURL_ARGS[@]}" -D "$HDR" -o "$BODY" "${PANEL}${REL_PATH}"
rc=$?
[ -n "$INBODY" ] && rm -f "$INBODY"
if [ $rc -ne 0 ]; then
    rm -f "$HDR" "$BODY"
    printf 'Status: 503 Service Unavailable\r\n'
    printf 'Content-Type: text/html; charset=utf-8\r\n\r\n'
    printf '<html><body style="font-family:sans-serif;padding:40px"><h3>同步服务未运行</h3><p>请到飞牛 应用中心 → 已安装 → GiteaHubSync 中启动应用。</p></body></html>\n'
    exit 0
fi

CTYPE_OUT="$(grep -i '^content-type:' "$HDR" | head -1 | cut -d' ' -f2 | tr -d '\r')"
[ -z "$CTYPE_OUT" ] && CTYPE_OUT="text/html; charset=utf-8"
printf 'Content-Type: %s\r\n' "$CTYPE_OUT"
printf 'Cache-Control: no-store\r\n'
printf '\r\n'
case "$CTYPE_OUT" in
    text/html*)
        # 注入 <base>，让页面里的相对路径 API 请求落在本 CGI 前缀下
        sed "s|<head>|<head><base href=\"/cgi/ThirdParty/${APP_SLUG}/index.cgi/\">|" "$BODY"
        ;;
    *)
        cat "$BODY"
        ;;
esac
rm -f "$HDR" "$BODY"
exit 0