"""Cloud Hypervisor REST API 传输（叶子模块，不依赖
cloud.sandbox，避免循环导入）。

只用标准库 raw HTTP over Unix socket，无第三方依赖。
"""

import json
import os
import socket


def _unix_socket_api(socket_path, method, path, payload=None):
    """Cloud Hypervisor REST API 的默认传输：标准库 raw HTTP
    over Unix socket（无第三方依赖）。返回 (status, body)，
    body 能解析 JSON 时为 dict，否则为原文本。socket 不存在
    或连接失败时 raise RuntimeError（调用方据此判 api 超时
    /失败，不编造 200）。"""
    if not os.path.exists(socket_path):
        raise RuntimeError("api socket 不存在：%s" % socket_path)
    body = b""
    if payload is not None:
        body = json.dumps(payload).encode("utf-8")
    req_lines = ["%s /api/v1%s HTTP/1.1" % (method, path),
                 "Host: localhost",
                 "Accept: application/json",
                 "Content-Type: application/json",
                 "Content-Length: %d" % len(body),
                 "Connection: close", "", ""]
    raw = "\r\n".join(req_lines).encode("utf-8") + body
    sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
    sock.settimeout(5)
    try:
        sock.connect(socket_path)
        sock.sendall(raw)
        chunks = []
        # feat-chv-fix（P1-6）：读超时不再当“响应结束”。
        # 先读满响应头，再按 Content-Length 读满体部；超时、
        # 提前关流、体部短于 Content-Length 一律 RuntimeError
        # （调用方判 api_timeout / 传输失败），绝不解析半截
        # 响应。chunked 与无 Content-Length 响应明确拒绝
        # （Cloud Hypervisor REST 不应发 chunked；无长度则
        # 无法证完整性）。
        buf = b""
        header_end = None
        timed_out = False
        while header_end is None:
            try:
                data = sock.recv(65536)
            except socket.timeout:
                timed_out = True
                break
            if not data:
                break
            buf += data
            header_end = buf.find(b"\r\n\r\n")
        if timed_out or header_end is None:
            raise RuntimeError("CHV API 响应头不完整（超时或提前关流）")
        header = buf[:header_end].decode("utf-8", errors="replace")
        body = buf[header_end + 4:]
        content_length = None
        is_chunked = False
        for line in header.split("\r\n")[1:]:
            if ":" not in line:
                continue
            name, value = line.split(":", 1)
            name = name.strip().lower()
            value = value.strip()
            if name == "content-length":
                try:
                    content_length = int(value)
                except ValueError:
                    raise RuntimeError("CHV API Content-Length 非法")
            elif name == "transfer-encoding" \
                    and "chunked" in value.lower():
                is_chunked = True
        if is_chunked:
            raise RuntimeError("CHV API 响应为 chunked，拒绝解析")
        if content_length is None:
            raise RuntimeError("CHV API 响应无 Content-Length，拒绝解析")
        while len(body) < content_length:
            try:
                data = sock.recv(65536)
            except socket.timeout:
                raise RuntimeError(
                    "CHV API 响应体截断：已收 %d / 需 %d 字节"
                    % (len(body), content_length))
            if not data:
                raise RuntimeError(
                    "CHV API 响应体截断：已收 %d / 需 %d 字节"
                    % (len(body), content_length))
            body += data
        body = body[:content_length]
    finally:
        sock.close()
    text = header + "\r\n\r\n" + body.decode("utf-8", errors="replace")
    status = 0
    if text.startswith("HTTP/"):
        try:
            status = int(text.split()[1])
        except (IndexError, ValueError):
            status = 0
    body_text = body.decode("utf-8", errors="replace")
    try:
        parsed = json.loads(body_text) if body_text.strip() else {}
    except ValueError:
        parsed = body_text
    return status, parsed


def normalize_api_result(result):
    """API 调用归一化：fake api_client 可返回 (status, body)
    或 {"status":..., "body":...} 或带 .status 的对象，本
    函数统一成 (status:int, body)。"""
    if isinstance(result, tuple) and len(result) == 2:
        return int(result[0]), result[1]
    if isinstance(result, dict):
        status = result.get("status", result.get("status_code"))
        body = result.get("body", result)
        return (int(status) if status is not None else 0), body
    status = getattr(result, "status", None) \
        or getattr(result, "status_code", None)
    return (int(status) if status is not None else 0), result