"""MCP 手机控制 Server（M0：设备列表/截图/点击/滑动）。

运行：MCP_ALLOW_WRITE=1 python -m mcp_server.mcp_server
客户端：Streamable HTTP @ http://<host>:8033/mcp
"""
import base64
import io
import logging

from fastmcp import FastMCP
from PIL import Image

from mcp_server import audit, config
from mcp_server.platform_client import PlatformClient, PlatformError

logging.basicConfig(level=logging.INFO,
                    format="%(asctime)s %(levelname)s [%(name)s] %(message)s")
_log = logging.getLogger("mcp")

S = config.Settings()

# 坐标空间缓存：serial -> (display_w, display_h, native_w, native_h)
# de_screenshot 返回的图与 de_tap/de_swipe 的坐标同一空间（display），
# server 按比例换算为设备原生坐标（模型只感知截图坐标系，不感知原生分辨率）。
_coord = {}
audit.init(S.audit_file)

mcp = FastMCP("mobile-control")
_platform = None


def platform():
    """惰性初始化平台客户端（启动即登录，失败明确报错）。"""
    global _platform
    if _platform is None:
        _platform = PlatformClient(S.platform_url, S.platform_user,
                                   S.platform_pass, S.platform_timeout)
    return _platform


def _check_serial(serial):
    """白名单校验：未配置时限制为平台设备池（enabled）设备。"""
    if not serial:
        raise PlatformError("invalid_param", "缺少 serial")
    if S.allowed_serials and serial not in S.allowed_serials:
        raise PlatformError("device_not_allowed", f"设备 {serial} 不在白名单")
    return serial


def _check_write():
    if not S.allow_write:
        raise PlatformError("write_disabled", "写操作未启用（MCP_ALLOW_WRITE=1 开启）")


def _to_native(serial, x, y):
    """截图坐标 → 设备原生坐标（按最近一次截图的比例换算）。"""
    c = _coord.get(serial)
    if not c:
        raise PlatformError("invalid_param",
                            "请先对该设备执行 de_screenshot（需要建立坐标空间）")
    dw, dh, nw, nh = c
    return (round(x * nw / dw), round(y * nh / dh))


def _err(e: PlatformError):
    return {"ok": False, "error": {"code": e.code, "message": e.message}}


def _ok(data):
    return {"ok": True, "data": data}


@mcp.tool()
def de_list_devices() -> dict:
    """列出可控制设备：serial/在线状态/型号/任务状态/前台 App。

    返回 [{serial, model, online, task_job, worker_status, foreground_app}]。
    """
    try:
        devs = platform().list_devices()
    except PlatformError as e:
        return _err(e)
    out = []
    for d in devs:
        out.append({
            "serial": d.get("serial"),
            "model": d.get("model") or d.get("device_name") or "",
            "online": bool(d.get("present")),
            "task_job": d.get("task_job") or "",
            "worker_status": d.get("worker_status") or "idle",
            "foreground_app": d.get("foreground_app") or "",
        })
    audit.audit("de_list_devices", "", "", f"{len(out)} 台")
    return _ok(out)


@mcp.tool()
def de_screenshot(serial: str) -> dict:
    """截取设备屏幕并返回图像（image/jpeg，宽 ≤540px）。

    同时返回 {width, height, screen_state}。多模态客户端可直接看图。
    """
    try:
        serial = _check_serial(serial)
        jpeg, screen_state = platform().screenshot(serial)
        img = Image.open(io.BytesIO(jpeg))
        w, h = img.size
        if w > S.screenshot_width:
            ratio = S.screenshot_width / w
            img = img.resize((S.screenshot_width, int(h * ratio)))
        buf = io.BytesIO()
        img.convert("RGB").save(buf, "JPEG", quality=S.jpeg_quality)
        data = base64.b64encode(buf.getvalue()).decode()
        # 记录坐标空间（display=返回图尺寸，native=设备原生），供 tap/swipe 换算
        nw, nh = platform().screen_size(serial)
        _coord[serial] = (img.size[0], img.size[1], nw, nh)
    except PlatformError as e:
        return _err(e)
    except Exception as e:
        return _err(PlatformError("platform_unavailable", f"截图处理失败: {e}"))
    audit.audit("de_screenshot", serial, f"{w}x{h}", "ok")
    dw, dh, nw, nh = _coord[serial]
    return _ok({"image": {"type": "image", "data": data,
                          "mimeType": "image/jpeg"},
                "width": dw, "height": dh,
                "native_size": {"width": nw, "height": nh},
                "screen_state": screen_state})


@mcp.tool()
def de_tap(serial: str, x: int, y: int) -> dict:
    """点击设备屏幕指定坐标。

    坐标空间 = de_screenshot 返回的图像坐标（display 空间）——先截图拿到
    native_size 后再点击，server 自动换算为设备原生坐标。
    """
    try:
        _check_write()
        serial = _check_serial(serial)
        if x < 0 or y < 0:
            raise PlatformError("invalid_param", "坐标不能为负")
        nx, ny = _to_native(serial, x, y)
        platform().tap(serial, nx, ny)
    except PlatformError as e:
        return _err(e)
    audit.audit("de_tap", serial, f"({x},{y})->native({nx},{ny})", "ok")
    return _ok({"action": "tap", "serial": serial, "x": x, "y": y})


@mcp.tool()
def de_swipe(serial: str, x1: int, y1: int, x2: int, y2: int,
             duration: float = 0.2) -> dict:
    """在设备屏幕上滑动（坐标空间同 de_tap：截图坐标，server 换算原生）。"""
    try:
        _check_write()
        serial = _check_serial(serial)
        nx1, ny1 = _to_native(serial, x1, y1)
        nx2, ny2 = _to_native(serial, x2, y2)
        platform().swipe(serial, nx1, ny1, nx2, ny2, duration)
    except PlatformError as e:
        return _err(e)
    audit.audit("de_swipe", serial, f"({x1},{y1})->({x2},{y2})", "ok")
    return _ok({"action": "swipe", "serial": serial})


_KEYS = ("back", "home", "recent", "menu", "power", "volume_up",
         "volume_down", "enter", "delete", "search", "camera")


@mcp.tool()
def de_wake(serial: str) -> dict:
    """点亮设备屏幕并解锁（熄屏时先调用它再截图）。"""
    try:
        _check_write()
        serial = _check_serial(serial)
        platform().wake(serial)
    except PlatformError as e:
        return _err(e)
    audit.audit("de_wake", serial, "", "ok")
    return _ok({"action": "wake", "serial": serial})


@mcp.tool()
def de_press_key(serial: str, key: str) -> dict:
    """按设备按键：back/home/recent/menu/power/enter/delete 等。"""
    try:
        _check_write()
        serial = _check_serial(serial)
        if key not in _KEYS:
            raise PlatformError("invalid_param", f"不支持的按键: {key}（可选 {_KEYS}）")
        platform().press_key(serial, key)
    except PlatformError as e:
        return _err(e)
    audit.audit("de_press_key", serial, key, "ok")
    return _ok({"action": "press_key", "serial": serial, "key": key})


def main():
    _log.info("MCP mobile-control 启动: allow_write=%s port=%s",
              S.allow_write, S.http_port)
    mcp.run(transport="http", host=S.http_host, port=S.http_port)


if __name__ == "__main__":
    main()