"""Task table models for GUI tabs."""

from __future__ import annotations

from .widgets import *
class TaskTableModel(QAbstractTableModel):
    """Table model for task rows shared by workflow tabs."""

    HEADERS = ["账号", "别名", "商品ID", "阶段"]

    STAGE_TEXT = {
        "imported": "待采集",
        "collected": "已采集",
        "generated": "已生成",
        "applied": "已更新",
    }

    STATUS_TEXT = {
        "running": "处理中",
        "failed": "失败",
        "skipped": "略过",
        "cancelled": "已取消",
    }
    PRODUCT_UNAVAILABLE_MARKERS = (
        "商品失效",
        "please input correct product id",
        "商品不存在",
        "商品已删除",
        "商品已下架",
        "無效商品",
        "无效商品",
        "無權限",
        "无权限",
        "product not found",
        "item not found",
        "invalid product",
        "invalid item",
    )

    def __init__(self, parent=None):
        super().__init__(parent)
        self.tasks = []
        self.all_tasks = []
        self.account_by_alias = {}
        self.filter_mode = "all"

    def set_tasks(self, tasks, accounts):
        self.beginResetModel()
        self.all_tasks = list(tasks)
        self.account_by_alias = {
            str(account.alias).strip(): account
            for account in accounts
            if str(account.alias).strip()
        }
        self.tasks = self._filtered_tasks()
        self.endResetModel()

    def set_filter_mode(self, mode):
        self.beginResetModel()
        self.filter_mode = mode if mode in {"all", "unmatched"} else "all"
        self.tasks = self._filtered_tasks()
        self.endResetModel()

    def _filtered_tasks(self):
        if self.filter_mode == "unmatched":
            return [task for task in self.all_tasks if self.is_unmatched(task)]
        return list(self.all_tasks)

    def rowCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.tasks)

    def columnCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.HEADERS)

    def headerData(self, section, orientation, role=Qt.DisplayRole):
        if role != Qt.DisplayRole:
            return None
        if orientation == Qt.Horizontal and 0 <= section < len(self.HEADERS):
            return self.HEADERS[section]
        return section + 1 if orientation == Qt.Vertical else None

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid():
            return None
        task = self.tasks[index.row()]
        if role == Qt.DisplayRole:
            return self._display_value(task, index.column())
        if role == Qt.ForegroundRole and index.column() == 3:
            return self._stage_color(task)
        if role == Qt.ToolTipRole:
            if self.is_unmatched(task):
                return "别名未匹配账号，采集时将略过"
            error = getattr(task, "last_error", "") or ""
            if error:
                return str(error)
        return None

    def flags(self, index):
        if not index.isValid():
            return Qt.NoItemFlags
        return Qt.ItemIsEnabled | Qt.ItemIsSelectable

    def task_at(self, row):
        if row < 0 or row >= len(self.tasks):
            return None
        return self.tasks[row]

    def is_unmatched(self, task) -> bool:
        return str(task.alias).strip() not in self.account_by_alias

    def unmatched_count(self) -> int:
        return sum(1 for task in self.all_tasks if self.is_unmatched(task))

    def _account_name(self, task) -> str:
        account = self.account_by_alias.get(str(task.alias).strip())
        if account is not None:
            return account.account_name
        return task.account_name or ""

    def _is_product_unavailable(self, task) -> bool:
        if getattr(task, "status", "") != "failed":
            return False
        error = str(getattr(task, "last_error", "") or "").lower()
        return bool(error) and any(marker.lower() in error for marker in self.PRODUCT_UNAVAILABLE_MARKERS)

    def _stage_text(self, task) -> str:
        if self.is_unmatched(task):
            return "略过"
        if self._is_product_unavailable(task):
            return "商品失效"
        if task.status in self.STATUS_TEXT and task.status != "pending":
            return self.STATUS_TEXT[task.status]
        return self.STAGE_TEXT.get(task.stage, task.stage)

    def _stage_color(self, task):
        if self.is_unmatched(task):
            return _qcolor(COLOR_MUTED)
        base_color = _status_base_color(getattr(task, "status", None))
        if base_color is not None:
            return _qcolor(base_color)
        if getattr(task, "stage", None) in {"collected", "generated", "applied"}:
            return _qcolor(COLOR_SUCCESS)
        return _qcolor(COLOR_PENDING)

    def _display_value(self, task, column):
        values = [
            self._account_name(task),
            task.alias,
            task.item_id,
            self._stage_text(task),
        ]
        return values[column] if 0 <= column < len(values) else None


class GenerateTaskTableModel(QAbstractTableModel):
    """Table model for Tab 2 generation candidates."""

    HEADERS = ["店铺", "商品ID", "旧标题", "新标题", "状态"]

    STATUS_TEXT = {
        "running": "处理中",
        "failed": "失败",
        "skipped": "略过",
        "cancelled": "已取消",
    }

    STAGE_TEXT = {
        "imported": "未采集",
        "collected": "待生成",
        "generated": "已生成",
        "applied": "已更新",
    }

    def __init__(self, parent=None, db_path=None, status_callback=None):
        super().__init__(parent)
        self.tasks = []
        self.account_by_alias = {}
        self.db_path = db_path
        self.status_callback = status_callback
        self.last_edit_error = None

    def set_tasks(self, tasks, accounts):
        self.beginResetModel()
        self.tasks = list(tasks)
        self.account_by_alias = {
            str(account.alias).strip(): account
            for account in accounts
            if str(account.alias).strip()
        }
        self.endResetModel()

    def rowCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.tasks)

    def columnCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.HEADERS)

    def headerData(self, section, orientation, role=Qt.DisplayRole):
        if role != Qt.DisplayRole:
            return None
        if orientation == Qt.Horizontal and 0 <= section < len(self.HEADERS):
            return self.HEADERS[section]
        return section + 1 if orientation == Qt.Vertical else None

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid():
            return None
        task = self.tasks[index.row()]
        if role in (Qt.DisplayRole, Qt.EditRole):
            return self._display_value(task, index.column())
        if role == Qt.ForegroundRole and index.column() == 4:
            return self._status_color(task)
        if role == Qt.ToolTipRole:
            if index.column() == 3 and self._can_edit_title(task):
                return "双击可微调新标题，只修改本地待更新内容"
            if task.last_error:
                return task.last_error
        return None

    def setData(self, index, value, role=Qt.EditRole):
        if role != Qt.EditRole or not index.isValid() or index.column() != 3:
            return False
        task = self.tasks[index.row()]
        if not self._can_edit_title(task):
            self._set_status("该任务不能修改新标题")
            return False
        title = str(value or "").strip()
        if title == str(task.new_title or ""):
            return True
        try:
            db.update_generated_title(task.id, title, path=self.db_path)
            updated = db.get_task(task.id, path=self.db_path)
        except Exception as exc:
            self.last_edit_error = str(exc)
            self._set_status(f"新标题修改失败：{exc}")
            return False
        self.tasks[index.row()] = updated
        self.last_edit_error = None
        self.dataChanged.emit(index, index, [Qt.DisplayRole, Qt.EditRole, Qt.ToolTipRole])
        self._set_status(f"已修改新标题：商品 {task.item_id}")
        return True

    def flags(self, index):
        if not index.isValid():
            return Qt.NoItemFlags
        flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable
        if index.column() == 3 and self._can_edit_title(self.tasks[index.row()]):
            flags |= Qt.ItemIsEditable
        return flags

    def _can_edit_title(self, task):
        return (
            getattr(task, "stage", None) == "generated"
            and getattr(task, "status", None) != "running"
            and int(getattr(task, "committed", 0) or 0) == 0
            and bool(getattr(task, "new_title", None))
        )

    def _set_status(self, message):
        if self.status_callback is not None:
            self.status_callback(message)

    def task_at(self, row):
        if row < 0 or row >= len(self.tasks):
            return None
        return self.tasks[row]

    def account_name_for(self, task):
        return self._account_name(task)

    def _account_name(self, task):
        account = self.account_by_alias.get(str(task.alias).strip())
        if account is not None:
            return account.account_name
        return task.account_name or task.alias or ""

    def _status_text(self, task):
        if task.status in self.STATUS_TEXT and task.status != "pending":
            return self.STATUS_TEXT[task.status]
        return self.STAGE_TEXT.get(task.stage, task.stage)

    def _status_color(self, task):
        base_color = _status_base_color(getattr(task, "status", None))
        if base_color is not None:
            return _qcolor(base_color)
        if getattr(task, "stage", None) in {"generated", "applied"}:
            return _qcolor(COLOR_SUCCESS)
        return _qcolor(COLOR_PENDING)

    def _display_value(self, task, column):
        values = [
            self._account_name(task),
            task.item_id,
            task.old_title or "",
            task.new_title or "",
            self._status_text(task),
        ]
        return values[column] if 0 <= column < len(values) else None


class ApplyTaskTableModel(QAbstractTableModel):
    """Table model for Tab 3 update candidates."""

    HEADERS = ["店铺", "商品ID", "新标题", "新封面", "阶段", "结果"]

    STATUS_TEXT = {
        "running": "处理中",
        "failed": "失败",
        "skipped": "略过",
        "cancelled": "已取消",
        "pending": "待更新",
        "success": "成功",
    }

    def __init__(self, parent=None):
        super().__init__(parent)
        self.tasks = []
        self.account_by_alias = {}

    def set_tasks(self, tasks, accounts):
        self.beginResetModel()
        self.tasks = list(tasks)
        self.account_by_alias = {
            str(account.alias).strip(): account
            for account in accounts
            if str(account.alias).strip()
        }
        self.endResetModel()

    def rowCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.tasks)

    def columnCount(self, parent=QModelIndex()):
        return 0 if parent.isValid() else len(self.HEADERS)

    def headerData(self, section, orientation, role=Qt.DisplayRole):
        if role != Qt.DisplayRole:
            return None
        if orientation == Qt.Horizontal and 0 <= section < len(self.HEADERS):
            return self.HEADERS[section]
        return section + 1 if orientation == Qt.Vertical else None

    def data(self, index, role=Qt.DisplayRole):
        if not index.isValid():
            return None
        task = self.tasks[index.row()]
        if role == Qt.DisplayRole:
            return self._display_value(task, index.column())
        if role == Qt.ForegroundRole:
            if index.column() == 4:
                return self._stage_color(task)
            if index.column() == 5:
                return self._result_color(task)
        if role == Qt.ToolTipRole and task.last_error:
            return task.last_error
        return None

    def flags(self, index):
        if not index.isValid():
            return Qt.NoItemFlags
        return Qt.ItemIsEnabled | Qt.ItemIsSelectable

    def task_at(self, row):
        if row < 0 or row >= len(self.tasks):
            return None
        return self.tasks[row]

    def account_name_for(self, task):
        account = self.account_by_alias.get(str(task.alias).strip())
        if account is not None:
            return account.account_name
        return task.account_name or task.alias or ""

    def _display_value(self, task, column):
        values = [
            self.account_name_for(task),
            task.item_id,
            task.new_title or "",
            os.path.basename(task.new_cover_path or ""),
            self._stage_text(task),
            self._result_text(task),
        ]
        return values[column] if 0 <= column < len(values) else None

    def _stage_text(self, task):
        if task.stage == "generated":
            return "待更新"
        if task.stage == "applied":
            return "已更新"
        return task.stage

    def _result_text(self, task):
        if task.status == "success" and task.stage == "generated":
            return "待更新"
        return self.STATUS_TEXT.get(task.status, task.status)

    def _stage_color(self, task):
        if getattr(task, "stage", None) == "applied":
            return _qcolor(COLOR_SUCCESS)
        return _qcolor(COLOR_PENDING)

    def _result_color(self, task):
        base_color = _status_base_color(getattr(task, "status", None))
        if base_color is not None:
            return _qcolor(base_color)
        if getattr(task, "status", None) == "pending":
            return _qcolor(COLOR_PENDING)
        if getattr(task, "status", None) == "success" and getattr(task, "stage", None) == "generated":
            return _qcolor(COLOR_PENDING)
        if getattr(task, "stage", None) == "applied" or getattr(task, "status", None) == "success":
            return _qcolor(COLOR_SUCCESS)
        return _qcolor(COLOR_PENDING)