from pathlib import Path
import calendar

from PyQt6 import QtWidgets
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QDialog, QFileDialog, QTreeWidgetItem
from PyQt6.QtGui import QCloseEvent

from warchron.view.ui.ui_main_window import Ui_MainWindow
from warchron.view.ui.ui_player_dialog import Ui_playerDialog
from warchron.view.ui.ui_war_dialog import Ui_warDialog
from warchron.view.ui.ui_campaign_dialog import Ui_campaignDialog

ROLE_TYPE = Qt.ItemDataRole.UserRole
ROLE_ID = Qt.ItemDataRole.UserRole + 1

class View(QtWidgets.QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(View, self).__init__(parent)
        self.setupUi(self)
        self.on_close_callback = None
        self.on_selection_changed = None
        self.on_add_campaign = None
        self.on_add_round = None
        self.warsTree.currentItemChanged.connect(self._emit_selection_changed)
        self.addCampaignBtn.clicked.connect(self._on_add_campaign_clicked)
        self.addRoundBtn.clicked.connect(self._on_add_round_clicked)

    def _emit_selection_changed(self, current, previous):
        if not self.on_tree_selection_changed:
            return
        if not current:
            self.on_tree_selection_changed(None)
            return
        self.on_tree_selection_changed({
            "type": current.data(0, ROLE_TYPE),
            "id": current.data(0, ROLE_ID),
        })
        
    def _on_add_campaign_clicked(self):
        if self.on_add_campaign:
            self.on_add_campaign()

    def _on_add_round_clicked(self):
        if self.on_add_round:
            self.on_add_round()

    def closeEvent(self, event: QCloseEvent):
        if self.on_close_callback:
            proceed = self.on_close_callback()
            if not proceed:
                event.ignore()
                return
        event.accept()

    def ask_open_file(self) -> Path | None:
        filename, _ = QFileDialog.getOpenFileName(
            self,
            "Open war history",
            "",
            "WarChron files (*.json)"
        )
        return Path(filename) if filename else None

    def ask_save_file(self) -> Path | None:
        filename, _ = QFileDialog.getSaveFileName(
            self,
            "Save war history",
            "",
            "WarChron files (*.json)"
        )
        return Path(filename) if filename else None

    def display_players(self, players: list):
        table = self.playersTable
        table.setRowCount(len(players))
        for row, player in enumerate(players):
            table.setItem(row, 0, QtWidgets.QTableWidgetItem(player.name))
            table.setItem(row, 1, QtWidgets.QTableWidgetItem(player.id))
        table.resizeColumnsToContents()

    def display_wars(self, wars: list):
        tree = self.warsTree
        tree.clear()
        tree.setColumnCount(1)
        tree.setHeaderLabels(["Wars"])
        for war in wars:
            war_item = QTreeWidgetItem([f"{war.name} ({war.year})"])
            war_item.setData(0, ROLE_TYPE, "war")
            war_item.setData(0, ROLE_ID, war.id)
            tree.addTopLevelItem(war_item)
            for camp in war.get_all_campaigns():
                camp_item = QTreeWidgetItem([f"{camp.name} ({calendar.month_name[camp.month]})"])
                camp_item.setData(0, ROLE_TYPE, "campaign")
                camp_item.setData(0, ROLE_ID, camp.id)
                war_item.addChild(camp_item)
                for index, rnd in enumerate(camp.get_all_rounds(), start=1):
                    rnd_item = QTreeWidgetItem([f"Round {index}"])
                    rnd_item.setData(0, ROLE_TYPE, "round")
                    rnd_item.setData(0, ROLE_ID, rnd.id)
                    camp_item.addChild(rnd_item)
        tree.expandAll()

    def get_selected_tree_item(self):
        item = self.warsTree.currentItem()
        if not item:
            return None
        return {
            "type": item.data(0, ROLE_TYPE),
            "id": item.data(0, ROLE_ID)
        }

    def set_add_campaign_enabled(self, enabled: bool):
        self.addCampaignBtn.setEnabled(enabled)

    def set_add_round_enabled(self, enabled: bool):
        self.addRoundBtn.setEnabled(enabled)

class PlayerDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_playerDialog()
        self.ui.setupUi(self)

    def get_player_name(self) -> str:
        return self.ui.playerName.text().strip()

class WarDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_warDialog()
        self.ui.setupUi(self)

    def get_war_name(self) -> str:
        return self.ui.warName.text().strip()

class CampaignDialog(QDialog):
    def __init__(self, parent=None):
        super().__init__(parent)
        self.ui = Ui_campaignDialog()
        self.ui.setupUi(self)

    def get_campaign_name(self) -> str:
        return self.ui.campaignName.text().strip()