from core.Constants import Constants

from PyQt6.QtWidgets import QApplication, QDialog, QVBoxLayout, QHBoxLayout, QLabel, QPushButton, QFrame, QScrollArea
from PyQt6.QtCore import Qt, QSize
from PyQt6.QtGui import QIcon, QFont, QColor, QPalette, QPixmap, QPainter
import sys

APP_VERSION = Constants.DB_VERSION_THIS_APP_WANTS

class DatabaseConflictDialog(QDialog):
    WIPE = 1
    MOVE_DB = 2
    EXIT = 3
    
    def __init__(self, check: dict, parent=None):
        super().__init__(parent)
        self.setWindowTitle("Database Recovery")
        self.setModal(True)
        self.user_choice = self.EXIT
        self.setMinimumWidth(550)
        self.setMinimumHeight(400)
        self.setMaximumWidth(750)
        self.setMaximumHeight(600)
        
        # Modern dark theme
        self.setStyleSheet("""
            DatabaseConflictDialog {
                background: qlineargradient(x1:0, y1:0, x2:1, y2:1,
                    stop:0 #0f172a, stop:1 #1e293b);
            }
        """)
        
        main_layout = QVBoxLayout()
        main_layout.setContentsMargins(0, 0, 0, 0)
        main_layout.setSpacing(0)
        
        # Header with gradient and icon
        header = QFrame()
        header.setStyleSheet("""
            QFrame {
                background: qlineargradient(x1:0, y1:0, x2:1, y2:0,
                    stop:0 #3b82f6, stop:1 #1e40af);
                border: none;
            }
        """)
        header.setFixedHeight(100)
        header_layout = QHBoxLayout()
        header_layout.setContentsMargins(30, 20, 30, 20)
        
        # Warning icon (using unicode)
        icon_label = QLabel("⚠️")
        icon_label.setFont(QFont("Segoe UI", 48))
        header_layout.addWidget(icon_label, 0, Qt.AlignmentFlag.AlignLeft | Qt.AlignmentFlag.AlignVCenter)
        
        # Title
        title_layout = QVBoxLayout()
        title_layout.setSpacing(5)
        title = QLabel("Database Compatibility")
        title.setFont(QFont("Segoe UI", 18, QFont.Weight.Bold))
        title.setStyleSheet("color: white;")
        title_layout.addWidget(title)
        
        subtitle = QLabel("Your App version and Database don't match")
        subtitle.setFont(QFont("Segoe UI", 11))
        subtitle.setStyleSheet("color: rgba(255, 255, 255, 0.8);")
        title_layout.addWidget(subtitle)
        
        header_layout.addLayout(title_layout, 1)
        header.setLayout(header_layout)
        main_layout.addWidget(header)
        
        # Content area with scroll support
        content = QFrame()
        content.setStyleSheet("""
            QFrame {
                background: #1e293b;
                border: none;
            }
        """)
        content_layout = QVBoxLayout()
        content_layout.setContentsMargins(0, 0, 0, 0)
        content_layout.setSpacing(0)
        
        # Scrollable area for dynamic content
        scroll_area = QScrollArea()
        scroll_area.setWidgetResizable(True)
        scroll_area.setStyleSheet("""
            QScrollArea {
                background: #1e293b;
                border: none;
            }
            QScrollBar:vertical {
                background: #1e293b;
                width: 12px;
            }
            QScrollBar::handle:vertical {
                background: #475569;
                border-radius: 6px;
                min-height: 20px;
            }
            QScrollBar::handle:vertical:hover {
                background: #64748b;
            }
            QScrollBar::add-line:vertical, QScrollBar::sub-line:vertical {
                border: none;
            }
        """)
        
        # Inner scrollable widget
        scroll_widget = QFrame()
        scroll_widget.setStyleSheet("background: #1e293b; border: none;")
        scroll_layout = QVBoxLayout()
        scroll_layout.setContentsMargins(40, 30, 40, 30)
        scroll_layout.setSpacing(15)
        
        # Main message
        message = QLabel(check["message"])
        message.setFont(QFont("Segoe UI", 12))
        message.setStyleSheet("color: #e2e8f0; line-height: 1.6;")
        message.setWordWrap(True)
        scroll_layout.addWidget(message)
        
        # Version info
        if check.get("db_version"):
            info_frame = QFrame()
            info_frame.setStyleSheet("""
                QFrame {
                    background: rgba(59, 130, 246, 0.1);
                    border: 1px solid rgba(59, 130, 246, 0.3);
                    border-radius: 6px;
                }
            """)
            info_layout = QVBoxLayout()
            info_layout.setContentsMargins(15, 12, 15, 12)
            info_layout.setSpacing(5)
            
            app_ver = QLabel(f"App is looking for database version: {APP_VERSION}")
            app_ver.setFont(QFont("Segoe UI", 10))
            app_ver.setStyleSheet("color: #94a3b8;")
            info_layout.addWidget(app_ver)
            
            db_ver = QLabel(f"Your Actual Database version: {check['db_version']}")
            db_ver.setFont(QFont("Segoe UI", 10))
            db_ver.setStyleSheet("color: #94a3b8;")
            info_layout.addWidget(db_ver)
            
            info_frame.setLayout(info_layout)
            scroll_layout.addWidget(info_frame)
        
        scroll_layout.addStretch()
        scroll_widget.setLayout(scroll_layout)
        scroll_area.setWidget(scroll_widget)
        content_layout.addWidget(scroll_area, 1)
        
        content.setLayout(content_layout)
        main_layout.addWidget(content, 1)
        
        # Button area
        button_area = QFrame()
        button_area.setStyleSheet("""
            QFrame {
                background: #0f172a;
                border-top: 1px solid #334155;
            }
        """)
        button_layout = QVBoxLayout()
        button_layout.setContentsMargins(40, 20, 40, 20)
        button_layout.setSpacing(12)
        
        if check["status"] == "version_mismatch":
            btn_backup = self._create_button(
                "Create a Fresh Database. Then restart (recommended)",
                "primary",
                "✅"
            )
            btn_backup.clicked.connect(self.on_wipe_create)
            button_layout.addWidget(btn_backup)
            
            btn_different = self._create_button(
                "Move the Stale Database for Debug Purposes",
                "secondary",
                "📁"
            )
            btn_different.clicked.connect(self.on_move_db)
            button_layout.addWidget(btn_different)
        
        btn_exit = self._create_button(
            "Exit App without action.",
            "danger",
            "❌"
        )
        btn_exit.clicked.connect(self.on_exit)
        button_layout.addWidget(btn_exit)
        
        button_area.setLayout(button_layout)
        main_layout.addWidget(button_area)
        
        self.setLayout(main_layout)
    
    def _create_button(self, text, style_type, icon):
        """Create a styled button"""
        btn = QPushButton(f"  {icon}  {text}")
        btn.setFont(QFont("Segoe UI", 11, QFont.Weight.Medium))
        btn.setFixedHeight(45)
        btn.setCursor(Qt.CursorShape.PointingHandCursor)
        
        if style_type == "primary":
            btn.setStyleSheet("""
                QPushButton {
                    background: qlineargradient(x1:0, y1:0, x2:1, y2:0,
                        stop:0 #3b82f6, stop:1 #2563eb);
                    color: white;
                    border: none;
                    border-radius: 6px;
                    font-weight: 600;
                }
                QPushButton:hover {
                    background: qlineargradient(x1:0, y1:0, x2:1, y2:0,
                        stop:0 #2563eb, stop:1 #1d4ed8);
                }
                QPushButton:pressed {
                    background: #1d4ed8;
                }
            """)
        elif style_type == "secondary":
            btn.setStyleSheet("""
                QPushButton {
                    background: #334155;
                    color: #e2e8f0;
                    border: 1px solid #475569;
                    border-radius: 6px;
                    font-weight: 600;
                }
                QPushButton:hover {
                    background: #475569;
                    border: 1px solid #64748b;
                }
                QPushButton:pressed {
                    background: #1e293b;
                }
            """)
        elif style_type == "danger":
            btn.setStyleSheet("""
                QPushButton {
                    background: #64748b;
                    color: #e2e8f0;
                    border: 1px solid #475569;
                    border-radius: 6px;
                    font-weight: 600;
                }
                QPushButton:hover {
                    background: #ef4444;
                    border: 1px solid #dc2626;
                }
                QPushButton:pressed {
                    background: #dc2626;
                }
            """)
        
        return btn
    
    def on_wipe_create(self):
        self.user_choice = self.WIPE
        self.accept()
    
    def on_move_db(self):
        self.user_choice = self.MOVE_DB
        self.accept()
    
    def on_exit(self):
        self.user_choice = self.EXIT
        self.reject()

def show_recovery_dialog(check: dict):
    """Show recovery dialog as standalone app and return user choice"""
    app = QApplication.instance() or QApplication(sys.argv)
    dialog = DatabaseConflictDialog(check)
    dialog.exec()
    return dialog.user_choice