import json
import os

from PyQt6.QtWidgets import (
    QApplication, QMainWindow, QWidget, QVBoxLayout,
    QHBoxLayout, QSlider, QComboBox, QLabel, QPushButton,
    QSizePolicy, QSpinBox, QLineEdit, QInputDialog, QFrame,
    QCheckBox, QMessageBox
)


BASE_DIR = os.path.dirname(os.path.abspath(__file__))
PRESETS_DIR = os.path.join(BASE_DIR, "presets")
PRESETS_FILE = os.path.join(PRESETS_DIR, "presets.json")
os.makedirs(PRESETS_DIR, exist_ok=True)


def load_presets_file():
    if os.path.exists(PRESETS_FILE):
        with open(PRESETS_FILE, "r") as f:
            return json.load(f)
    return {"__last_used__": None, "presets": {}}

def save_presets_file(data):
    with open(PRESETS_FILE, "w") as f:
        json.dump(data, f, indent=2)

def ensure_preset_structure(presets):
    if "presets" not in presets:
        return {"__last_used__": None, "presets": presets}
    return presets

def on_preset_selected(menu_presets: QComboBox, app_window: QMainWindow, ready: bool, loaded_presets: dict):

    selectedOption = menu_presets.currentText()

    if ready and selectedOption and selectedOption in loaded_presets["presets"]:
        loaded_presets["__last_used__"] = selectedOption
        save_presets_file(loaded_presets)
        app_window.apply_preset(loaded_presets["presets"][selectedOption])

def save_preset(app_window: QMainWindow, menu_presets: QComboBox, loaded_presets: dict):

    selectedOption = menu_presets.currentText()

    if not selectedOption or selectedOption not in loaded_presets["presets"]:
        app_window.save_preset_as()  # not self
        return
    loaded_presets["presets"][selectedOption] = app_window._build_preset_data(selectedOption)  # not self
    loaded_presets["__last_used__"] = selectedOption
    save_presets_file(loaded_presets)
    app_window._show_save_status()  # not self
    print(f"Saved preset: {selectedOption}")

def save_preset_as(app_window: QMainWindow, menu_presets: QComboBox, loaded_presets: dict):

    print(f"save as button tapped")  

    selectedOption = menu_presets.currentText()

    selectedOption, ok = QInputDialog.getText(app_window, "Save As", "Preset name:")
    if not ok or not selectedOption.strip():
        return
    selectedOption = selectedOption.strip()
    loaded_presets["presets"][selectedOption] = app_window._build_preset_data(selectedOption)
    loaded_presets["__last_used__"] = selectedOption
    save_presets_file(loaded_presets)
    app_window.refresh_preset_combo()
    menu_presets.setCurrentText(selectedOption)
    app_window._show_save_status()
    print(f"Saved preset as: {selectedOption}")

    
def delete_preset(app_window: QMainWindow, menu_presets: QComboBox, loaded_presets: dict):

    selectedOption = menu_presets.currentText()

    selectedOption = menu_presets.currentText()

    if not selectedOption or selectedOption not in loaded_presets["presets"]:
        return
    
    msg = QMessageBox(app_window)
    msg.setWindowTitle("Remove Preset")
    msg.setText(f'Are you sure you want to remove "{selectedOption}"?')
    msg.setIcon(QMessageBox.Icon.NoIcon)
    msg.setStandardButtons(QMessageBox.StandardButton.Yes | QMessageBox.StandardButton.No)
    reply = msg.exec()

    if reply != QMessageBox.StandardButton.Yes:
        return
    
    del loaded_presets["presets"][selectedOption]

    if loaded_presets["__last_used__"] == selectedOption:
        loaded_presets["__last_used__"] = None
        
    save_presets_file(loaded_presets)
    app_window.refresh_preset_combo()
    print(f"Deleted preset: {selectedOption}")