# tabs/review_tab.py
import random
from PyQt6.QtWidgets import (
    QWidget, QVBoxLayout, QHBoxLayout, QLabel, 
    QLineEdit, QPushButton, QTableWidget, QTableWidgetItem, 
    QHeaderView, QFormLayout, QMessageBox
)
from PyQt6.QtCore import Qt, pyqtSlot
import database

class ReviewTab(QWidget):
    def __init__(self, parent=None):
        super().__init__(parent)
        
        # Master cache of records loaded from the database
        self.all_cached_records = []
        
        # Primary Layout
        main_layout = QVBoxLayout(self)
        main_layout.setContentsMargins(30, 20, 30, 20)
        main_layout.setSpacing(15)
        
        # --- SECTION 1: TOP REGION (Source Context & Tags) ---
        top_container = QWidget()
        top_layout = QFormLayout(top_container)
        top_layout.setLabelAlignment(Qt.AlignmentFlag.AlignRight)
        top_layout.setSpacing(10)
        
        self.txt_review_context = QLineEdit()
        self.txt_review_context.setPlaceholderText("Filter deck by context (e.g., Camino 2027)...")
        self.txt_review_context.setStyleSheet("padding: 6px; font-size: 14px;")
        self.txt_review_context.textChanged.connect(self.handle_live_filter)
        
        self.txt_review_tags = QLineEdit()
        self.txt_review_tags.setPlaceholderText("Filter deck by tags (e.g., verb, greeting)...")
        self.txt_review_tags.setStyleSheet("padding: 6px; font-size: 14px;")
        self.txt_review_tags.textChanged.connect(self.handle_live_filter)
        
        top_layout.addRow(QLabel("<b>Source Context:</b>"), self.txt_review_context)
        top_layout.addRow(QLabel("<b>Tags:</b>"), self.txt_review_tags)
        
        main_layout.addWidget(top_container)
        
        # --- SECTION 2: MIDDLE REGION (Translations Table View) ---
        self.table = QTableWidget()
        self.table.setColumnCount(2)
        self.table.setHorizontalHeaderLabels(["English Phrase", "Spanish Translation"])
        self.table.setSelectionBehavior(QTableWidget.SelectionBehavior.SelectRows)
        self.table.setEditTriggers(QTableWidget.EditTrigger.NoEditTriggers)
        
        # Format table header behaviors to stretch beautifully
        header = self.table.horizontalHeader()
        header.setSectionResizeMode(0, QHeaderView.ResizeMode.Stretch)
        header.setSectionResizeMode(1, QHeaderView.ResizeMode.Stretch)
        
        main_layout.addWidget(self.table)
        
        # --- SECTION 3: BOTTOM REGION (Action Control Panel) ---
        bottom_layout = QHBoxLayout()
        bottom_layout.setSpacing(15)
        
        self.btn_generate_deck = QPushButton("🗂️ Generate Deck")
        self.btn_generate_deck.setCursor(Qt.CursorShape.PointingHandCursor)
        self.btn_generate_deck.setStyleSheet("""
            QPushButton { 
                background-color: #27AE60; 
                color: white; 
                font-weight: bold; 
                font-size: 14px; 
                padding: 10px 22px; 
                border-radius: 5px; 
            }
            QPushButton:hover { background-color: #219653; }
        """)
        self.btn_generate_deck.clicked.connect(self.generate_deck_action)
        
        self.btn_generate_video = QPushButton("🎬 Generate Video")
        self.btn_generate_video.setCursor(Qt.CursorShape.PointingHandCursor)
        self.btn_generate_video.setStyleSheet("""
            QPushButton { 
                background-color: #2980B9; 
                color: white; 
                font-weight: bold; 
                font-size: 14px; 
                padding: 10px 22px; 
                border-radius: 5px; 
            }
            QPushButton:hover { background-color: #1F618D; }
        """)
        self.btn_generate_video.clicked.connect(self.generate_video_action)
        
        bottom_layout.addWidget(self.btn_generate_deck)
        bottom_layout.addWidget(self.btn_generate_video)
        bottom_layout.addStretch()
        
        main_layout.addLayout(bottom_layout)
        
        # Populate initial table layout on startup
        self.reload_review_pool()

    @pyqtSlot()
    def reload_review_pool(self):
        """Fetches consolidated text entries from the database and initializes cache."""
        try:
            self.all_cached_records = database.get_all_translations_explicit()
            self.handle_live_filter()
        except Exception as e:
            print(f"Error initializing flashcard display: {e}")

    @pyqtSlot()
    def handle_live_filter(self):
        """Filters the display table row contents matching current Context and Tags criteria."""
        self.table.blockSignals(True)
        self.table.setRowCount(0)
        
        filter_ctx = self.txt_review_context.text().lower().strip()
        filter_tag = self.txt_review_tags.text().lower().strip()
        
        visible_row_index = 0
        for row in self.all_cached_records:
            val_ctx = (row["source_context"] or "").lower()
            val_tag = (row["tags"] or "").lower()
            
            # Show row if it satisfies both filter boxes
            if (filter_ctx in val_ctx) and (filter_tag in val_tag):
                self.table.insertRow(visible_row_index)
                
                item_en = QTableWidgetItem(row["en_text"])
                item_es = QTableWidgetItem(row["es_text"])
                
                self.table.setItem(visible_row_index, 0, item_en)
                self.table.setItem(visible_row_index, 1, item_es)
                
                visible_row_index += 1
                
        self.table.blockSignals(False)

    @pyqtSlot()
    def generate_deck_action(self):
        """Placeholder function execution trigger for processing deck compiler passes."""
        QMessageBox.information(
            self, 
            "Deck Compiler Active", 
            f"Compiling a custom Anki training deck container using the {self.table.rowCount()} visible filtered rows."
        )

    @pyqtSlot()
    def generate_video_action(self):
        """Placeholder function execution trigger for media compiler production automation."""
        QMessageBox.information(
            self, 
            "Media Generator Active", 
            f"Initiating background video asset production using the {self.table.rowCount()} visible phrases."
        )