from copy import deepcopy
from uuid import uuid4

from PySide6.QtCore import Qt
from PySide6.QtWidgets import QDialog, QDialogButtonBox, QListWidgetItem, QMessageBox

from bedit.core.model import Component, Port
from bedit.core.port_types import PortTypeRegistry
from bedit.gui.generated.ui_port_options_dialog import Ui_PortOptionsDialog


PORT_ROLE = Qt.ItemDataRole.UserRole


class PortOptionsDialog(QDialog):
    """Unified editor for a component's typed, oriented ports."""

    def __init__(self, component: Component, parent=None, *, read_only: bool = False) -> None:
        super().__init__(parent)
        self.ui = Ui_PortOptionsDialog()
        self.ui.setupUi(self)
        self.setWindowTitle(f"Port Options — {component.name}")
        self.ports: list[tuple[Port, str]] = [
            *((deepcopy(port), "input") for port in component.inputs),
            *((deepcopy(port), "output") for port in component.outputs),
        ]
        self._loading = False
        self.ui.typeCombo.clear()
        for port_type in PortTypeRegistry.all():
            self.ui.typeCombo.addItem(port_type.display_name, port_type.id)
        self.ui.orientationCombo.setItemData(0, "input")
        self.ui.orientationCombo.setItemData(1, "output")
        self.ui.portList.currentRowChanged.connect(self._load_current)
        self.ui.addPortButton.clicked.connect(self.add_port)
        self.ui.removePortButton.clicked.connect(self.remove_port)
        self.ui.nameEdit.textEdited.connect(self._store_current)
        self.ui.typeCombo.currentIndexChanged.connect(self._store_current)
        self.ui.orientationCombo.currentIndexChanged.connect(self._store_current)
        self.ui.portSplitter.setSizes([250, 370])
        if read_only:
            self.ui.addPortButton.setEnabled(False)
            self.ui.removePortButton.setEnabled(False)
            self.ui.nameEdit.setReadOnly(True)
            self.ui.typeCombo.setEnabled(False)
            self.ui.orientationCombo.setEnabled(False)
            self.ui.buttonBox.button(QDialogButtonBox.StandardButton.Ok).setText("Close")
            self.ui.buttonBox.button(QDialogButtonBox.StandardButton.Cancel).hide()
        self._rebuild_list(0 if self.ports else -1)

    @property
    def inputs(self) -> list[Port]:
        return [port for port, orientation in self.ports if orientation == "input"]

    @property
    def outputs(self) -> list[Port]:
        return [port for port, orientation in self.ports if orientation == "output"]

    def _rebuild_list(self, row: int = -1) -> None:
        self.ui.portList.clear()
        for port, orientation in self.ports:
            item = QListWidgetItem(f"{port.name}   [{orientation}, {port.type}]")
            item.setData(PORT_ROLE, port.id)
            self.ui.portList.addItem(item)
        self.ui.portList.setCurrentRow(min(row, len(self.ports) - 1))
        self._update_enabled()

    def _load_current(self, row: int) -> None:
        self._loading = True
        enabled = 0 <= row < len(self.ports)
        if enabled:
            port, orientation = self.ports[row]
            self.ui.nameEdit.setText(port.name)
            self.ui.typeCombo.setCurrentIndex(self.ui.typeCombo.findData(port.type))
            self.ui.orientationCombo.setCurrentIndex(self.ui.orientationCombo.findData(orientation))
        else:
            self.ui.nameEdit.clear()
        self._loading = False
        self._update_enabled()

    def _update_enabled(self) -> None:
        enabled = self.ui.portList.currentRow() >= 0
        self.ui.removePortButton.setEnabled(enabled)
        self.ui.nameEdit.setEnabled(enabled)
        self.ui.typeCombo.setEnabled(enabled)
        self.ui.orientationCombo.setEnabled(enabled)

    def _store_current(self) -> None:
        row = self.ui.portList.currentRow()
        if self._loading or not (0 <= row < len(self.ports)):
            return
        port, _orientation = self.ports[row]
        port.name = self.ui.nameEdit.text()
        port.type = self.ui.typeCombo.currentData()
        self.ports[row] = (port, self.ui.orientationCombo.currentData())
        self.ui.portList.item(row).setText(
            f"{port.name}   [{self.ports[row][1]}, {port.type}]"
        )

    def add_port(self) -> None:
        port = Port(
            id=f"port-{uuid4().hex[:8]}",
            name=f"Port {len(self.ports) + 1}",
            properties={"iconPosition": {"x": 0.0, "y": 0.0}},
            type="signal",
        )
        self.ports.append((port, "input"))
        self._rebuild_list(len(self.ports) - 1)
        self.ui.nameEdit.selectAll()
        self.ui.nameEdit.setFocus()

    def remove_port(self) -> None:
        row = self.ui.portList.currentRow()
        if row >= 0:
            self.ports.pop(row)
            self._rebuild_list(min(row, len(self.ports) - 1))

    def accept(self) -> None:
        self._store_current()
        if any(not port.name.strip() for port, _orientation in self.ports):
            QMessageBox.warning(self, "Invalid port", "Every port must have a name.")
            return
        super().accept()