"""
Conditional block widget for the AutoScript orchestration dialog.
"""
from PySide6.QtCore import Slot
from PySide6.QtWidgets import (
    QComboBox,
    QGroupBox,
    QHBoxLayout,
    QLabel,
    QPushButton,
    QSizePolicy,
    QVBoxLayout,
    QWidget,
)

from gui.ALAutoScriptOrchDialog._widgets import (
    ActionStepFrame,
    ConditionRowFrame,
)


class ConditionalBlock(QGroupBox):

    def __init__(
        self,
        blockIndex: int,
        varMgr = None,
        parent = None
    ):

        super().__init__(parent)
        self.blockIndex = blockIndex
        self._varMgr = varMgr
        self._actionWidgets = []
        self._conditionRows = []

        self.setupUi()
        self.connectSignals()
        self.addInitialConditionRow()


    def setupUi(
        self
    ):

        self.setUpdatesEnabled(False)
        self.setStyleSheet(
            "QGroupBox { font-weight: bold; border: 1px solid #ccc; "
            "margin-top: 5px; padding-top: 5px; }"
        )
        self.setSizePolicy(QSizePolicy.Preferred, QSizePolicy.Fixed)
        mainLayout = QVBoxLayout(self)
        mainLayout.setSpacing(6)
        mainLayout.setContentsMargins(8, 8, 8, 8)

        headerLayout = QHBoxLayout()
        headerLayout.setSpacing(8)
        self.typeCombo = QComboBox(self)
        self.typeCombo.addItem("IF", "IF")
        self.typeCombo.addItem("ELSE IF", "ELSE IF")
        self.typeCombo.addItem("ELSE", "ELSE")
        self.typeCombo.setFixedHeight(25)
        if self.blockIndex == 0:
            self.typeCombo.setEnabled(False)
        headerLayout.addWidget(QLabel("类型:", self))
        headerLayout.addWidget(self.typeCombo)
        headerLayout.addStretch()
        self.deleteBlockBtn = QPushButton("删除此块", self)
        self.deleteBlockBtn.setStyleSheet("color: red;")
        self.deleteBlockBtn.setFixedHeight(25)
        headerLayout.addWidget(self.deleteBlockBtn)
        mainLayout.addLayout(headerLayout)

        self.conditionWidget = QWidget(self)
        self.conditionWidget.setSizePolicy(
            QSizePolicy.Preferred, QSizePolicy.Preferred
        )
        condLayout = QVBoxLayout(self.conditionWidget)
        condLayout.setContentsMargins(4, 4, 4, 4)
        condLayout.setSpacing(6)

        self.condRowsLayout = QVBoxLayout()
        self.condRowsLayout.setSpacing(4)
        condLayout.addLayout(self.condRowsLayout)
        self.addCondBtn = QPushButton("+ 添加条件", self.conditionWidget)
        self.addCondBtn.setFixedHeight(25)
        condLayout.addWidget(self.addCondBtn)
        mainLayout.addWidget(self.conditionWidget)
        self.actionLabel = QLabel("执行步骤:", self)
        self.actionLabel.setFixedHeight(25)
        mainLayout.addWidget(self.actionLabel)
        self.actionsLayout = QVBoxLayout()
        self.actionsLayout.setSpacing(4)
        mainLayout.addLayout(self.actionsLayout)
        self.addActionBtn = QPushButton("+ 添加执行步骤", self)
        self.addActionBtn.setFixedHeight(25)
        mainLayout.addWidget(self.addActionBtn)
        self.setUpdatesEnabled(True)


    def connectSignals(
        self
    ):

        self.typeCombo.currentIndexChanged.connect(self.onTypeChanged)
        self.addCondBtn.clicked.connect(self.addConditionRow)
        self.addActionBtn.clicked.connect(self.addActionStep)


    def addInitialConditionRow(
        self
    ):

        row = ConditionRowFrame(
            self._varMgr, self.blockIndex,
            isFirst=True, parent=self
        )
        self._conditionRows.append(row)
        self.condRowsLayout.addWidget(row)


    def addConditionRow(
        self
    ):

        row = ConditionRowFrame(
            self._varMgr, self.blockIndex,
            isFirst=False, parent=self
        )
        row.deleteBtn.clicked.connect(lambda: self.removeConditionRow(row))
        self._conditionRows.append(row)
        self.condRowsLayout.addWidget(row)


    def removeConditionRow(
        self,
        row: ConditionRowFrame
    ):

        if row in self._conditionRows and len(self._conditionRows) > 1:
            self._conditionRows.remove(row)
            self.condRowsLayout.removeWidget(row)
            row.hide()
            row.deleteLater()


    def addActionStep(
        self
    ):

        step = ActionStepFrame(self._varMgr, self.blockIndex, parent=self)
        step.deleteBtn.clicked.connect(lambda: self.removeActionStep(step))
        self._actionWidgets.append(step)
        self.actionsLayout.addWidget(step)


    def removeActionStep(
        self,
        step: ActionStepFrame
    ):

        if step in self._actionWidgets:
            self._actionWidgets.remove(step)
            self.actionsLayout.removeWidget(step)
            step.hide()
            step.deleteLater()

    @Slot(int)
    def onTypeChanged(
        self,
        _idx
    ):

        isCond = self.typeCombo.currentData() in ("IF", "ELSE IF")
        self.conditionWidget.setVisible(isCond)
        self.actionLabel.setText(
            "执行步骤:" if isCond else "ELSE 执行步骤:"
        )


    def getBlockType(
        self
    ) -> str:

        return self.typeCombo.currentData()


    def getConditionRows(
        self
    ):

        return list(self._conditionRows)


    def getActionSteps(
        self
    ):

        return list(self._actionWidgets)


    def countActionSteps(
        self
    ) -> int:

        return len(self._actionWidgets)


    def toScriptLines(
        self
    ) -> list:

        blockType = self.getBlockType()
        lines = []

        if blockType in ("IF", "ELSE IF"):
            condTexts = [
                r.toConditionText() for r in self._conditionRows if r.toConditionText()
            ]
            if not condTexts:
                condTexts = [".TRUE."]

            if len(condTexts) == 1:
                combined = condTexts[0]
            else:
                parts = []
                for i, ct in enumerate(condTexts):
                    if i > 0:
                        logic = self._conditionRows[i].getLogic() or ".AND."
                        parts.append(f" {logic} ")
                    parts.append(f"({ct})")
                combined = "".join(parts)
            if blockType == "IF":
                lines.append(f"IF({combined}) THEN")
            else:
                lines.append(f"ELSE IF({combined}) THEN")
        else:
            lines.append("ELSE")
        for step in self._actionWidgets:
            scriptLine = step.toScriptLine()
            if scriptLine:
                lines.append(scriptLine)
        return lines


    def refreshVarCombos(
        self
    ):

        for row in self._conditionRows:
            row.refreshVarCombos()
        for step in self._actionWidgets:
            step.refreshVarCombos()


    def setPrevBlockType(
        self,
        prevType: str | None
    ):

        model = self.typeCombo.model()
        if model is None:
            return
        for data in ("ELSE IF", "ELSE"):
            idx = self.typeCombo.findData(data)
            if idx < 0:
                continue
            item = model.item(idx)
            shouldEnable = prevType != "ELSE"
            item.setEnabled(shouldEnable)
        if prevType == "ELSE" and self.typeCombo.currentData() in ("ELSE IF", "ELSE"):
            self.typeCombo.setCurrentIndex(0)