"""
ScanOrg101.py - Enhanced file scanning and organization module
"""

# flake8: noqa: E501

import os
import concurrent.futures
from collections import deque
import time
from PyQt6.QtCore import Qt, QThread, QSortFilterProxyModel, pyqtSignal
from dbman import FireflyDB
from metaextract import MetadataExtractor, mutagen
from archiver import ArchiveExtractor


# Directory Filter Proxy Model
class DirectoryFilterProxyModel(QSortFilterProxyModel):
    def __init__(self):
        super().__init__()
        self.setFilterCaseSensitivity(Qt.CaseSensitivity.CaseInsensitive)
        self.setFilterKeyColumn(0)

    def filterAcceptsRow(self, source_row, source_parent):
        source_model = self.sourceModel()
        if source_model is None:
            return False

        index = source_model.index(source_row, 0, source_parent)

        if hasattr(source_model, "isDir"):
            return source_model.isDir(index)  # type: ignore
        return False


# File Filter Proxy Model
class FileFilterProxyModel(QSortFilterProxyModel):
    def __init__(self):
        super().__init__()
        self.setFilterCaseSensitivity(Qt.CaseSensitivity.CaseInsensitive)
        self.setFilterKeyColumn(0)
        self.allowed_extensions = [
            ".zip",
            ".mp3",
            ".wav",
            ".flac",
            ".mid",
            ".midi",
            ".aiff",
            ".aif",
            ".aifc",
            ".au",
            ".snd",
            ".wv",
            ".wma",
            ".m4a",
            ".7z",
            ".rar",
        ]

    def filterAcceptsRow(self, source_row, source_parent):
        source_model = self.sourceModel()
        if source_model is None:
            return False

        index = source_model.index(source_row, 0, source_parent)

        if hasattr(source_model, "isDir") and source_model.isDir(index):  # type: ignore
            return True

        if hasattr(source_model, "fileName"):
            return source_model.fileName(index).endswith(  # type: ignore
                tuple(self.allowed_extensions)
            )

        return False


# Enhanced File Scanner with optimizations
class FileScanner(QThread):
    items_found = pyqtSignal(list)  # Now emits batches of items
    scan_complete = pyqtSignal()
    progress_update = pyqtSignal(int)
    directory_scanned = pyqtSignal(str)  # New signal for lazy loading

    def __init__(self, path, batch_size=500, max_workers=4):
        """
        Initialize the file scanner with performance optimizations

        Args:
            path: Starting path to scan
            batch_size: Number of items to collect before emitting a batch
            max_workers: Maximum number of parallel scanning threads
        """
        super().__init__()
        self.path = path
        self.stop_requested = False
        self.cache = {}
        self.scanned_directories = (
            set()
        )  # Track which directories have been scanned
        self.batch_size = batch_size
        self.max_workers = max_workers
        self.allowed_extensions = {
            ".mid",
            ".midi",
            ".mp3",
            ".wav",
            ".ogg",
            ".flac",
            ".aac",
            ".m4a",
            ".wma",
            ".flp",
            ".als",
            ".logic",
            ".logicx",
            ".ptx",
            ".pts",
            ".cpr",
            ".rpp",
            ".reason",
            ".sng",
            ".ardour",
            ".bwproject",
            ".zip",
            ".7z",
            ".rar",
        }

    def run(self):
        """Main thread run method - only scans the root path initially"""
        # Check cache first
        if self.path in self.cache:
            self.items_found.emit(self.cache[self.path])
            self.scan_complete.emit()
            return

        # Only scan the top level directory initially (lazy loading)
        self.scan_single_directory(self.path)
        self.scan_complete.emit()

    def scan_directory_recursive(self, path):
        """
        Recursively scan a directory - used when explicitly requesting
        a full scan of all subdirectories
        """
        if path in self.cache:
            return self.cache[path]

        items = []
        batch = []
        dirs_to_scan = deque([path])  # type: ignore

        # For progress estimation
        start_time = time.time()  # type: ignore
        progress_update_interval = 0.2  # seconds
        last_update_time = start_time
        entries_processed = 0

        # Estimate total number of items
        try:
            sample_count = len(list(os.scandir(path)))
            estimated_total = sample_count * 10  # Simple heuristic
        except (PermissionError, OSError):
            estimated_total = 1000  # Fallback estimate

        with concurrent.futures.ThreadPoolExecutor(
            max_workers=self.max_workers
        ) as executor:
            futures = {}

            while dirs_to_scan and not self.stop_requested:
                # Process directories in parallel
                while dirs_to_scan and len(futures) < self.max_workers:
                    dir_path = dirs_to_scan.popleft()
                    if dir_path not in self.scanned_directories:
                        futures[
                            executor.submit(
                                self.scan_single_directory_helper, dir_path
                            )
                        ] = dir_path

                # Process completed directories
                for future in list(
                    concurrent.futures.as_completed(futures.keys())
                ):
                    dir_path = futures.pop(future)

                    try:
                        dir_items, subdirs = future.result()
                        entries_processed += len(dir_items)

                        # Add results to our list
                        items.extend(dir_items)
                        batch.extend(dir_items)

                        # Add subdirectories to our queue
                        dirs_to_scan.extend(subdirs)

                        # Mark directory as scanned
                        self.scanned_directories.add(dir_path)
                        self.directory_scanned.emit(dir_path)

                        # Emit batch if it's full
                        if len(batch) >= self.batch_size:
                            self.items_found.emit(batch)
                            batch = []

                        # Update progress periodically
                        current_time = time.time()  # type: ignore
                        if (
                            current_time - last_update_time
                            > progress_update_interval
                        ):
                            # Simple progress estimation
                            progress = min(
                                99,
                                int(entries_processed / estimated_total * 100),
                            )
                            self.progress_update.emit(progress)
                            last_update_time = current_time
                    except Exception as e:
                        print(f"Error scanning directory {dir_path}: {e}")

            # Emit any remaining items in the final batch
            if batch and not self.stop_requested:
                self.items_found.emit(batch)

        # Store in cache
        self.cache[path] = items
        self.progress_update.emit(100)  # Final update
        return items

    def scan_single_directory(self, path):
        """
        Scan a single directory without recursion - supports lazy loading
        """
        if self.stop_requested:
            return []

        if path in self.cache:
            items = self.cache[path]
            self.items_found.emit(items)
            return items

        try:
            items = []
            with os.scandir(path) as entries:
                for entry in entries:
                    if self.stop_requested:
                        break

                    if entry.is_dir():
                        # For directories, just add them to the list
                        # but don't scan them yet (lazy loading)
                        items.append((entry.path, True))
                    elif entry.is_file() and entry.name.lower().endswith(
                        tuple(self.allowed_extensions)
                    ):
                        items.append((entry.path, False))

            # Store in cache and emit
            self.cache[path] = items
            self.items_found.emit(items)
            self.scanned_directories.add(path)
            self.directory_scanned.emit(path)
            self.progress_update.emit(100)  # Show complete for this directory
            return items
        except PermissionError:
            print(f"Permission denied: {path}")
            return []
        except OSError as e:
            print(f"Error accessing {path}: {e}")
            return []

    def scan_single_directory_helper(self, path):
        """Helper method for parallel directory scanning"""
        items = []
        subdirs = []

        try:
            with os.scandir(path) as entries:
                for entry in entries:
                    if self.stop_requested:
                        break

                    if entry.is_dir():
                        items.append((entry.path, True))
                        subdirs.append(entry.path)
                    elif entry.is_file() and entry.name.lower().endswith(
                        tuple(self.allowed_extensions)
                    ):
                        items.append((entry.path, False))
        except (PermissionError, OSError) as e:
            print(f"Error accessing {path}: {e}")

        return items, subdirs

    def request_directory_scan(self, path):
        """Request a scan of a specific directory (for lazy loading)"""
        if path in self.scanned_directories:
            return

        items = self.scan_single_directory(path)
        return items

    def request_full_scan(self):
        """Request a full recursive scan of all subdirectories"""
        items = self.scan_directory_recursive(self.path)
        self.scan_complete.emit()
        return items

    def stop(self):
        self.stop_requested = True


# Main Organizer class
class Organizer:

    def __init__(
        self, use_db=False, db_host="localhost", db_port=6379, db_password=None
    ):
        self.file_list = []
        self.dir_list = []
        self.scanner = None
        self.metadata_extractor = None
        self.archive_extractor = None

        # Signals for UI updates
        self.on_scan_complete = None
        self.on_progress_update = None
        self.on_metadata_complete = None

        # Database integration - use FireflyDB from dbman.py
        self.use_db = use_db
        self.db_manager = FireflyDB()
        if use_db:
            self.db_manager.connect_to(use_db, db_host, db_port, db_password)
            self.db = self.db_manager.db
        else:
            self.db = None

    def close(self):
        """Close database connection when done"""
        if hasattr(self, "db_manager"):
            self.db_manager.close()
            self.db = None

    def start_scan(self, path):
        """Start scanning a directory for files"""
        self.file_list.clear()
        self.dir_list.clear()

        self.scanner = FileScanner(path)
        self.scanner.items_found.connect(self.add_items)
        self.scanner.scan_complete.connect(self.scan_finished)

        # Connect progress signal if handler exists
        if self.on_progress_update:
            self.scanner.progress_update.connect(self.on_progress_update)

        self.scanner.start()

    def add_items(self, items):
        """Process items found during scanning"""
        for path, is_dir in items:
            if is_dir:
                self.dir_list.append(path)
            else:
                self.file_list.append(path)

    def scan_finished(self):
        """Handle scan completion"""
        print(
            f"Scan complete. Found {len(self.dir_list)} directories\
            and {len(self.file_list)} files."
        )
        if self.on_scan_complete:
            self.on_scan_complete()

    def stop_scan(self):
        """Stop the current scan operation"""
        if self.scanner:
            self.scanner.stop()
            self.scanner.wait()

    def extract_metadata(self):
        """Extract metadata from audio files using MetadataExtractor from metaextract.py"""
        if not self.file_list:
            print("No files to extract metadata from")
            return

        # Verify database connection if enabled
        if self.use_db and self.db:
            if not self.db_manager.verify_database_connection():
                print(
                    "Warning: Database verification failed, continuing without database"
                )
                self.use_db = False
                self.db = None

        # Use MetadataExtractor from metaextract.py
        self.metadata_extractor = MetadataExtractor(self.file_list)
        self.metadata_extractor.metadata_extracted.connect(
            self.process_metadata
        )
        self.metadata_extractor.extraction_complete.connect(
            self.metadata_extraction_complete
        )

        # Connect progress signal if handler exists
        if self.on_progress_update:
            self.metadata_extractor.progress_update.connect(
                self.on_progress_update
            )

        # Set the callback for metadata completion
        self.metadata_extractor.on_metadata_complete = (
            self.on_metadata_complete
        )

        self.metadata_extractor.start()

    def process_metadata(self, metadata):
        """Process extracted metadata using FireflyDB from dbman.py"""
        # Use the database manager to process metadata
        if hasattr(self, "db_manager"):
            self.db_manager.process_metadata(metadata)

        # Also update local sets for UI display
        if "artist" in metadata and metadata["artist"]:
            if not hasattr(self, "artists"):
                self.artists = set()
            self.artists.add(metadata["artist"])

        if "album" in metadata and metadata["album"]:
            if not hasattr(self, "albums"):
                self.albums = set()
            self.albums.add(metadata["album"])

        if "genre" in metadata and metadata["genre"]:
            if not hasattr(self, "genres"):
                self.genres = set()
            self.genres.add(metadata["genre"])

        if "year" in metadata and metadata["year"]:
            if not hasattr(self, "years"):
                self.years = set()
            self.years.add(metadata["year"])

    def metadata_extraction_complete(self):
        """Handle metadata extraction completion"""
        print(
            f"Metadata extraction complete. Artists: {len(getattr(self, 'artists', []))}, "
            f"Albums: {len(getattr(self, 'albums', []))}, Genres: {len(getattr(self, 'genres', []))}, "
            f"Years: {len(getattr(self, 'years', []))}"
        )

    def extract_archive(self, archive_path, extraction_dir):
        """Extract an archive to specified directory using ArchiveExtractor from archiver.py"""
        if not os.path.isfile(archive_path):
            print(f"Error: Archive file {archive_path} does not exist")
            return False

        if not os.path.isdir(extraction_dir):
            print(
                f"Error: Extraction directory {extraction_dir} does not exist"
            )
            return False

        print(f"Extracting archive {archive_path} to {extraction_dir}")

        # Create an ArchiveExtractor instance from archiver.py
        self.archive_extractor = ArchiveExtractor(archive_path, extraction_dir)

        # Connect signals
        if self.on_progress_update:
            self.archive_extractor.extraction_progress.connect(
                self.on_progress_update
            )

        # Define completion handler
        def on_extraction_complete(extracted_files):
            print(
                f"Archive extraction complete. Extracted {len(extracted_files)} files."
            )
            # Add extracted files to our file list if they match our criteria
            for file_path in extracted_files:
                if os.path.isfile(file_path) and any(
                    file_path.lower().endswith(ext)
                    for ext in [
                        ".mp3",
                        ".wav",
                        ".flac",
                        ".m4a",
                        ".wma",
                        ".mid",
                        ".midi",
                    ]
                ):
                    self.file_list.append(file_path)

            # Automatically extract metadata from audio files if enabled
            audio_files = [
                f
                for f in extracted_files
                if any(
                    f.lower().endswith(ext)
                    for ext in [
                        ".mp3",
                        ".wav",
                        ".flac",
                        ".m4a",
                        ".wma",
                        ".mid",
                        ".midi",
                    ]
                )
            ]

            if audio_files and self.use_db:
                print(
                    f"Found {len(audio_files)} audio files in archive, extracting metadata..."
                )
                temp_extractor = MetadataExtractor(audio_files)
                temp_extractor.metadata_extracted.connect(
                    self.process_metadata
                )
                temp_extractor.start()

        # Connect completion signal
        self.archive_extractor.extraction_complete.connect(
            on_extraction_complete
        )

        # Define error handler
        def on_extraction_error(error_message):
            print(f"Archive extraction error: {error_message}")

        # Connect error signal
        self.archive_extractor.extraction_error.connect(on_extraction_error)

        # Start extraction
        self.archive_extractor.start()
        return True

    def extract_archive_to_directory(
        self, archive_path, target_directory=None
    ):
        """Extract an archive to a specified directory or to a subdirectory in the same location"""
        if not os.path.isfile(archive_path):
            print(f"Error: Archive file {archive_path} does not exist")
            return False

        # If no target directory is specified, create one based on the archive name
        if not target_directory:
            archive_name = os.path.splitext(os.path.basename(archive_path))[0]
            target_directory = os.path.join(
                os.path.dirname(archive_path), archive_name
            )

            # Create the directory if it doesn't exist
            if not os.path.exists(target_directory):
                try:
                    os.makedirs(target_directory)
                    print(f"Created directory {target_directory}")
                except OSError as e:
                    print(f"Error creating directory {target_directory}: {e}")
                    return False

        return self.extract_archive(archive_path, target_directory)

    def has_metadata_in_db(self, file_path):
        """Check if metadata for a file already exists in the database"""
        if not self.use_db or not self.db:
            return False

        try:
            # Delegate to the db_manager
            return self.db_manager.has_metadata_in_db(file_path)
        except Exception as e:
            print(f"Error checking metadata in database: {e}")
            return False

    def get_metadata_from_db(self, file_path):
        """Retrieve metadata for a file from the database"""
        if not self.use_db or not self.db:
            return None

        try:
            # Delegate to the db_manager
            return self.db_manager.get_metadata_from_db(file_path)
        except Exception as e:
            print(f"Error retrieving metadata from database: {e}")
            return None

    def store_metadata(self, metadata):
        """Store audio file metadata in the database"""
        if not self.use_db or not self.db:
            print("Database usage is disabled, not storing metadata")
            return False

        try:
            # Delegate to the db_manager
            return self.db_manager.store_metadata(metadata)
        except Exception as e:
            print(f"Error storing metadata in database: {e}")
            import traceback

            traceback.print_exc()
            return False