"""PDD 任务页的事件绑定。

把 `pdd_ui.py` 里控件的信号，接到查询、任务引擎等实际动作上。

改动本文件前必读 `client/AGENTS.md`。以下几条最容易踩：

- **禁止在 Qt 主线程做任何阻塞的事**：Admin 请求、uiautomator2/ADB 调用、
  `time.sleep()`、轮询、大 XML 解析、批量写文件。做了界面就会卡死转圈。
- 长任务统一用 `QObject` + `moveToThread` 的 Worker 写法，
  模板照抄 `docs/client/02-architecture.md` §5.1。
  **不要**用 `QThread` 子类、`QRunnable` 或 Python 的 `threading`。
- 后台结果只能通过**信号**回到主线程，Worker 里一行界面代码都不许有。
- 窗口关闭时要断开信号并置标志位，否则迟到的后台结果会访问
  已经销毁的控件、直接崩溃。做法见同文档 §5.2。
- 数据库读写走 Repository，**不要在这里拼业务 SQL**。
- “获取任务”会真的去操作手机采集商品；“搜索”只读本地数据库。
  两者必须分开，不得共用入口。
- 普通成功不弹窗，更新界面即可；可恢复错误用 `InfoBar`
  （模板见 `docs/client/05-ui-specification.md` §9.1）；
  只有必须让用户当场做决定时才用模态对话框。
"""

from typing import Dict, Optional

from PyQt5.QtCore import QCoreApplication, QObject, QThread, pyqtSignal, pyqtSlot
from qfluentwidgets import InfoBar, InfoBarPosition

from .admin_gateway import (
    AdminGatewayError,
    AdminTask,
    ClientInfo,
    AdminGateway,
)
from .collect_task_service import CollectServiceFactory, CollectTaskService
from .current_client_service import CurrentClientService
from .http_admin_gateway import DEFAULT_ADMIN_BASE_URL, HttpAdminGateway
from .pdd_ui import PDDTaskPage, TaskRow
from .selected_android_device_service import SelectedAndroidDeviceService
from .settings_repository import SettingsRepository
from .task_models import (
    NewClaimedTask,
    TaskFilters,
    TaskStatus,
    TaskSummary,
    TaskType,
)
from .task_repository import TaskRepository
from .task_detail_view import TaskDetailWindow


TASK_TYPE_BY_TEXT = {
    "采集": TaskType.COLLECT,
    "采购": TaskType.PURCHASE,
}

TASK_STATUS_BY_TEXT = {
    "待执行": TaskStatus.CLAIMED,
    "执行中": TaskStatus.RUNNING,
    "结果待提交": TaskStatus.RESULT_PENDING,
    "等待重试": TaskStatus.RETRY_WAIT,
    "需要人工处理": TaskStatus.MANUAL_REVIEW,
    "已完成": TaskStatus.SUCCEEDED,
    "失败": TaskStatus.FAILED,
    "已取消": TaskStatus.CANCELLED,
}

TASK_TYPE_TEXT = {
    TaskType.COLLECT: "采集",
    TaskType.PURCHASE: "采购",
}

TASK_STATUS_TEXT = {
    TaskStatus.CLAIMED: "待执行",
    TaskStatus.RUNNING: "执行中",
    TaskStatus.RESULT_PENDING: "结果待提交",
    TaskStatus.RETRY_WAIT: "等待重试",
    TaskStatus.MANUAL_REVIEW: "需要人工处理",
    TaskStatus.SUCCEEDED: "已完成",
    TaskStatus.FAILED: "失败",
    TaskStatus.CANCELLED: "已取消",
}


def admin_task_to_new_claimed_task(task: AdminTask) -> NewClaimedTask:
    """把 Admin 任务显式映射为本地任务，避免字段名自动展开出错。"""

    if task.task_type is not TaskType.COLLECT:
        raise ValueError(f"任务 {task.task_id} 不是采集任务")

    payload = dict(task.payload)
    goods_url = payload.get("goods_url")
    goods_id = payload.get("goods_id")
    if not isinstance(goods_url, str) or not goods_url.strip():
        raise ValueError("payload.goods_url 不能为空")
    if goods_id is not None and not isinstance(goods_id, str):
        raise ValueError("payload.goods_id 必须是文本")

    original_task = {
        "id": task.task_id,
        "type": task.task_type.value,
        "version": task.version,
        "priority": task.priority,
        "payload": payload,
        "created_at": task.created_at,
        "updated_at": task.updated_at,
    }
    return NewClaimedTask(
        remote_task_id=task.task_id,
        task_type=task.task_type,
        goods_url=goods_url,
        goods_id=goods_id.strip() if isinstance(goods_id, str) else None,
        priority=task.priority,
        version=task.version,
        admin_payload=original_task,
    )


class ClaimTaskWorker(QObject):
    """在后台补交或执行至多一条采集任务。"""

    noTask = pyqtSignal()
    taskSaved = pyqtSignal(str)
    duplicateTask = pyqtSignal(str)
    localSaveFailed = pyqtSignal(str, str)
    failed = pyqtSignal(str)
    outcome = pyqtSignal(str, str, str)
    completed = pyqtSignal()

    def __init__(
        self,
        gateway: AdminGateway,
        task_repository: TaskRepository,
        client_service: CurrentClientService,
        android_device_service: SelectedAndroidDeviceService,
        collect_service_factory: Optional[CollectServiceFactory] = None,
    ) -> None:
        super().__init__()
        self._gateway = gateway
        self._task_repository = task_repository
        self._client_service = client_service
        self._android_device_service = android_device_service
        self._cancelled = False
        self._collect_service_factory = collect_service_factory

    def cancel(self) -> None:
        """阻止尚未开始的领取；已领取的任务仍必须保存到本地。"""

        self._cancelled = True

    @pyqtSlot()
    def run(self) -> None:
        try:
            if self._cancelled:
                return
            client_settings = self._client_service.load()
            if not client_settings.client_id:
                self.failed.emit("请先在设置页保存当前设备号和设备名")
                return
            android_serial = self._android_device_service.load()

            result = CollectTaskService(
                self._gateway,
                self._task_repository,
                ClientInfo(
                    client_settings.client_id,
                    client_settings.client_name,
                ),
                android_serial or "",
                cancelled=lambda: self._cancelled,
                collect_service_factory=self._collect_service_factory,
            ).execute_one()
            if not self._cancelled or result.kind == "cancelled":
                self.outcome.emit(result.kind, result.message, result.task_id)
        except AdminGatewayError as exc:
            if not self._cancelled:
                request_hint = (
                    f"，请求编号：{exc.request_id}" if exc.request_id else ""
                )
                self.failed.emit(f"{exc}{request_hint}")
        except Exception as exc:
            if not self._cancelled:
                self.failed.emit(f"执行采集任务失败：{exc}")
        finally:
            self.completed.emit()


class PDDTaskPageEvent(QObject):
    """把 PDD 页面只读操作连接到本地任务 Repository。"""

    def __init__(
        self,
        page: PDDTaskPage,
        repository: Optional[TaskRepository] = None,
        parent=None,
        claim_gateway: Optional[AdminGateway] = None,
        settings_repository: Optional[SettingsRepository] = None,
        collect_service_factory: Optional[CollectServiceFactory] = None,
    ):
        super().__init__(parent or page)
        self._page = page
        self._repository = repository or TaskRepository()
        self._filters = TaskFilters()
        self._closing = False
        self._claim_busy = False
        self._claim_thread: Optional[QThread] = None
        self._claim_worker: Optional[ClaimTaskWorker] = None
        self._detail_windows: Dict[str, TaskDetailWindow] = {}
        self._collect_service_factory = collect_service_factory

        try:
            self._repository.recover_interrupted_work()
        except AttributeError:
            # 测试用的只读 Repository 可以不实现恢复接口。
            pass

        settings = settings_repository or SettingsRepository()
        self._client_service = CurrentClientService(settings)
        self._selected_android_device_service = SelectedAndroidDeviceService(
            settings
        )
        self._claim_gateway = claim_gateway
        self._claim_gateway_error = ""
        if self._claim_gateway is None:
            base_url = settings.get("admin.base_url", DEFAULT_ADMIN_BASE_URL)
            timeout_value = settings.get("admin.request_timeout_seconds", 3.0)
            try:
                timeout_seconds = float(timeout_value)
                self._claim_gateway = HttpAdminGateway(
                    base_url if isinstance(base_url, str) else "",
                    timeout_seconds=timeout_seconds,
                    client_id=self._client_service.load().client_id,
                )
            except (TypeError, ValueError) as exc:
                self._claim_gateway_error = str(exc)

        page.searchRequested.connect(self.search_tasks)
        page.refreshRequested.connect(self.refresh_tasks)
        page.autoFetchRequested.connect(self._request_claim_task)
        page.detailRequested.connect(self.show_task_detail)
        page.taskModel.loadMoreRequested.connect(self._load_page)
        page.autoFetchButton.setText("获取任务")
        page.destroyed.connect(self.shutdown)
        application = QCoreApplication.instance()
        if application is not None:
            application.aboutToQuit.connect(self.shutdown)

    def load_initial_tasks(self) -> None:
        """应用启动后读取第一页本地任务。"""

        self._reload()

    def search_tasks(self, values: Dict[str, str]) -> None:
        """把界面中文筛选值转换成领域筛选，并重新查询。"""

        self._filters = TaskFilters(
            task_type=TASK_TYPE_BY_TEXT.get(values.get("task_type", "全部")),
            status=TASK_STATUS_BY_TEXT.get(values.get("status", "全部")),
            keyword=values.get("keyword", "").strip(),
        )
        self._reload()

    def refresh_tasks(self) -> None:
        """使用当前筛选条件刷新列表。"""

        self._reload()

    @pyqtSlot()
    def _request_claim_task(self) -> None:
        """启动一次后台领取；重复点击和关闭期间直接忽略。"""

        if self._closing or self._claim_busy:
            return
        if self._claim_gateway_error or self._claim_gateway is None:
            message = self._claim_gateway_error or "Admin 领取服务未初始化"
            self._page.set_engine_status(f"领取失败：{message}")
            self._show_claim_error("领取任务失败", message)
            return

        self._claim_busy = True
        self._page.autoFetchButton.setEnabled(False)
        self._page.set_engine_status("正在处理一条采集任务，请稍候…")

        thread = QThread(self)
        worker = ClaimTaskWorker(
            self._claim_gateway,
            self._repository,
            self._client_service,
            self._selected_android_device_service,
            self._collect_service_factory,
        )
        worker.moveToThread(thread)
        thread.started.connect(worker.run)
        worker.noTask.connect(self._on_no_claimed_task)
        worker.taskSaved.connect(self._on_claimed_task_saved)
        worker.duplicateTask.connect(self._on_duplicate_claimed_task)
        worker.localSaveFailed.connect(self._on_claimed_task_save_failed)
        worker.failed.connect(self._on_claim_failed)
        worker.outcome.connect(self._on_collect_outcome)
        worker.completed.connect(thread.quit)
        worker.completed.connect(worker.deleteLater)
        thread.finished.connect(thread.deleteLater)
        thread.finished.connect(self._on_claim_thread_finished)
        self._claim_thread = thread
        self._claim_worker = worker
        thread.start()

    @pyqtSlot()
    def _on_no_claimed_task(self) -> None:
        if not self._closing:
            self._page.set_engine_status("暂无可领取的采集任务")

    @pyqtSlot(str)
    def _on_claimed_task_saved(self, task_id: str) -> None:
        if self._closing:
            return
        self._page.set_engine_status(
            f"已领取任务 {task_id}，已保存到本地任务列表"
        )
        self._reload()

    @pyqtSlot(str)
    def _on_duplicate_claimed_task(self, task_id: str) -> None:
        if not self._closing:
            self._page.set_engine_status(
                f"任务 {task_id} 本地已有，未重复保存"
            )

    @pyqtSlot(str, str)
    def _on_claimed_task_save_failed(self, task_id: str, message: str) -> None:
        if not self._closing:
            content = (
                f"任务 {task_id} 已在服务端领取，但本地保存失败：{message}。"
                "请记下这个任务号联系维护者。"
            )
            self._page.set_engine_status(content)
            self._show_claim_error("本地任务保存失败", content)

    @pyqtSlot(str)
    def _on_claim_failed(self, message: str) -> None:
        if not self._closing:
            content = message or "领取任务失败，请稍后重试"
            self._page.set_engine_status(content)
            self._show_claim_error("领取任务失败", content)

    @pyqtSlot(str, str, str)
    def _on_collect_outcome(self, kind: str, message: str, _task_id: str) -> None:
        if self._closing:
            return
        self._page.set_engine_status(message)
        self._reload()
        if kind in {"result_pending", "manual_review", "failed"}:
            self._show_claim_error("采集任务需要处理", message)

    def _show_claim_error(self, title: str, content: str) -> None:
        """显示不会自动消失的可恢复错误，同时保留底部状态文字。"""

        InfoBar.error(
            title=title,
            content=content,
            isClosable=True,
            duration=-1,
            position=InfoBarPosition.TOP_RIGHT,
            parent=self._page,
        )

    @pyqtSlot()
    def _on_claim_thread_finished(self) -> None:
        self._claim_worker = None
        self._claim_thread = None
        self._claim_busy = False
        if not self._closing:
            self._page.autoFetchButton.setText("获取任务")
            self._page.autoFetchButton.setEnabled(True)

    def _reload(self) -> None:
        self._page.begin_task_reload()
        self._page.taskModel.fetchMore()

    def _load_page(self, offset: int, limit: int) -> None:
        try:
            summaries = self._repository.list_tasks(
                filters=self._filters,
                limit=limit,
                offset=offset,
            )
        except Exception:
            self._page.set_load_error("无法读取本地任务，请检查数据库后重试。")
            return

        rows = [summary_to_row(summary) for summary in summaries]
        self._page.append_task_page(rows, has_more=len(rows) == limit)

    @pyqtSlot(str)
    def show_task_detail(self, task_id: str) -> None:
        """读取本地完整任务，并打开一个非模态详情窗口。"""

        if self._closing or not task_id:
            return
        current = self._detail_windows.get(task_id)
        if current is not None:
            current.showNormal()
            current.raise_()
            current.activateWindow()
            return

        try:
            detail = self._repository.get_task(task_id)
        except Exception:
            InfoBar.error(
                title="无法打开任务详情",
                content="无法读取本地任务，请检查数据库后重试。",
                isClosable=True,
                duration=-1,
                position=InfoBarPosition.TOP_RIGHT,
                parent=self._page,
            )
            return
        if detail is None:
            InfoBar.warning(
                title="任务不存在",
                content=f"本地找不到任务 {task_id}，请刷新任务列表。",
                isClosable=True,
                duration=5000,
                position=InfoBarPosition.TOP_RIGHT,
                parent=self._page,
            )
            return

        window = TaskDetailWindow(detail, self._page.window())
        window.closed.connect(self._on_detail_closed)
        self._detail_windows[task_id] = window
        window.show()
        window.raise_()
        window.activateWindow()

    @pyqtSlot(str)
    def _on_detail_closed(self, task_id: str) -> None:
        self._detail_windows.pop(task_id, None)
        if not self._closing:
            self._page.taskTable.setFocus()

    @pyqtSlot()
    def shutdown(self) -> None:
        """窗口关闭时停止新的领取，并等待已领取任务完成本地保存。"""

        if self._closing:
            return
        self._closing = True

        for window in list(self._detail_windows.values()):
            window.close()
        self._detail_windows.clear()

        worker = self._claim_worker
        thread = self._claim_thread
        if worker is not None:
            try:
                worker.cancel()
                signal_slots = (
                    (worker.noTask, self._on_no_claimed_task),
                    (worker.taskSaved, self._on_claimed_task_saved),
                    (worker.duplicateTask, self._on_duplicate_claimed_task),
                    (
                        worker.localSaveFailed,
                        self._on_claimed_task_save_failed,
                    ),
                    (worker.failed, self._on_claim_failed),
                    (worker.outcome, self._on_collect_outcome),
                )
            except RuntimeError:
                signal_slots = ()
            for signal, slot in signal_slots:
                try:
                    signal.disconnect(slot)
                except (TypeError, RuntimeError):
                    pass

        if thread is not None and thread.isRunning():
            thread.quit()
            # uiautomator2/ADB 的单次调用可能需要数秒才返回。先通过
            # cancelled 标志让采集在下一个安全点退出，再等待工作线程收尾，
            # 避免窗口销毁时出现 "QThread destroyed while running"。
            thread.wait(60_000)


def summary_to_row(summary: TaskSummary) -> TaskRow:
    """把领域摘要转换成只供表格显示的轻量行。"""

    return TaskRow(
        remote_task_id=summary.remote_task_id,
        task_type=TASK_TYPE_TEXT[summary.task_type],
        goods_id=summary.goods_id or "",
        title=summary.title or "",
        color=summary.target_color or "",
        size=summary.target_size or "",
        price_cents=summary.price_cent,
        quantity=summary.quantity,
        status=TASK_STATUS_TEXT[summary.status],
        updated_at=summary.updated_at,
    )