from pathlib import Path

from PyQt6.QtWidgets import QMessageBox, QDialog
from warchron.model.model import Model
from warchron.view.view import View

from warchron.view.view import PlayerDialog, WarDialog, CampaignDialog

class Controller:
    def __init__(self, model: Model, view: View):
        self.model = model
        self.view = view
        self.current_file: Path | None = None
        self.selected_war_id = None
        self.selected_campaign_id = None
        self.selected_round_id = None
        self.view.on_close_callback = self.on_app_close
        self.is_dirty = False
        self.__connect()
        self.refresh_players_view()
        self.refresh_wars_view()
        self.update_window_title()
        self.update_actions_state()
        self.view.on_tree_selection_changed = self.on_tree_selection_changed
        self.view.on_add_campaign = self.add_campaign
        self.view.on_add_round = self.add_round

    def __connect(self):
        self.view.actionExit.triggered.connect(self.view.close)
        self.view.actionNew.triggered.connect(self.new)
        self.view.actionOpen.triggered.connect(self.open_file)
        self.view.actionSave.triggered.connect(self.save)
        self.view.actionSave_as.triggered.connect(self.save_as)
        self.view.addPlayerBtn.clicked.connect(self.add_player)
        self.view.addWarBtn.clicked.connect(self.add_war)

    def on_app_close(self) -> bool:
        if self.is_dirty:
            reply = QMessageBox.question(
                self.view,
                "Unsaved changes",
                "You have unsaved changes. Do you want to save before quitting?",
                QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No | QMessageBox.StandardButton.Cancel
            )
            if reply == QMessageBox.StandardButton.Yes:
                self.save()
            elif reply == QMessageBox.StandardButton.Cancel:
                return False
        return True
    
    def new(self):
        if self.is_dirty:
            reply = QMessageBox.question(
                self.view,
                "Unsaved changes",
                "Discard current campaign?",
                QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
            )
            if reply != QMessageBox.StandardButton.Yes:
                return
        self.model.new()
        self.current_file = None
        self.is_dirty = False
        self.refresh_players_view()
        self.refresh_wars_view()
        self.update_window_title()

    def open_file(self):
        if self.is_dirty:
            reply = QMessageBox.question(
                self.view,
                "Unsaved changes",
                "Discard current campaign?",
                QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No
            )
            if reply != QMessageBox.StandardButton.Yes:
                return
        path = self.view.ask_open_file()
        if not path:
            return
        self.model.load(path)
        self.current_file = path
        self.is_dirty = False
        self.refresh_players_view()
        self.refresh_wars_view()
        self.update_window_title()
   
    def save(self):
        if not self.current_file:
            self.save_as()
            return
        self.model.save(self.current_file)
        self.is_dirty = False
        self.update_window_title()

    def save_as(self):
        path = self.view.ask_save_file()
        if not path:
            return
        self.current_file = path
        self.model.save(path)
        self.is_dirty = False
        self.update_window_title()

    def update_window_title(self):
        base = "WarChron"
        if self.current_file:
            base += f" - {self.current_file.name}"
        else:
            base += f" - New file"
        if self.is_dirty:
            base = base + " *"
        self.view.setWindowTitle(base)

    def refresh_players_view(self):
        players = self.model.get_all_players()
        self.view.display_players(players)

    def refresh_wars_view(self):
        wars = self.model.get_all_wars()
        self.view.display_wars(wars)

    def on_tree_selection_changed(self, selection):
        self.selected_war_id = None
        self.selected_campaign_id = None
        self.selected_round_id = None
        if selection:
            if selection["type"] == "war":
                self.selected_war_id = selection["id"]
            elif selection["type"] == "campaign":
                self.selected_campaign_id = selection["id"]
            elif selection["type"] == "round":
                self.selected_round_id = selection["id"]
        self.update_actions_state()

    def update_actions_state(self):
        self.view.set_add_campaign_enabled(self.selected_war_id is not None)
        self.view.set_add_round_enabled(self.selected_campaign_id is not None)

    def add_player(self):   
        dialog = PlayerDialog(self.view)
        result = dialog.exec()  # modal blocking dialog
        if result == QDialog.DialogCode.Accepted:
            name = dialog.get_player_name()
            if not name:
                QMessageBox.warning(
                    self.view,
                    "Invalid name",
                    "Player name cannot be empty."
                )
                return
            self.model.add_player(name)
            self.is_dirty = True
            self.refresh_players_view()
            self.update_window_title() 
        
    def add_war(self):   
        dialog = WarDialog(self.view)
        result = dialog.exec()  # modal blocking dialog
        if result == QDialog.DialogCode.Accepted:
            name = dialog.get_war_name()
            if not name:
                QMessageBox.warning(
                    self.view,
                    "Invalid name",
                    "War name cannot be empty."
                )
                return
            self.model.add_war(name)
            self.is_dirty = True
            self.refresh_wars_view()
            self.update_window_title() 

    def add_campaign(self):
        if not self.selected_war_id:
            return
        dialog = CampaignDialog(self.view)
        if dialog.exec() != QDialog.DialogCode.Accepted:
            return
        name = dialog.get_campaign_name()
        if not name:
            return
        self.model.add_campaign(self.selected_war_id, name)
        self.is_dirty = True
        self.refresh_wars_view()
        self.update_window_title()

    def add_round(self):
        if not self.selected_campaign_id:
            return
        self.model.add_round(self.selected_campaign_id)
        self.is_dirty = True
        self.refresh_wars_view()
        self.update_window_title()