"""Command module for basic-memory sync operations."""

import asyncio
from collections import defaultdict
from dataclasses import dataclass
from pathlib import Path
from typing import List, Dict

import typer
from loguru import logger
from rich.console import Console
from rich.tree import Tree

from basic_memory import db
from basic_memory.cli.app import app
from basic_memory.config import config
from basic_memory.db import DatabaseType
from basic_memory.markdown import EntityParser
from basic_memory.markdown.markdown_processor import MarkdownProcessor
from basic_memory.repository import (
    EntityRepository,
    ObservationRepository,
    RelationRepository,
)
from basic_memory.repository.search_repository import SearchRepository
from basic_memory.services import EntityService, FileService
from basic_memory.services.link_resolver import LinkResolver
from basic_memory.services.search_service import SearchService
from basic_memory.sync import SyncService, FileChangeScanner
from basic_memory.sync.utils import SyncReport
from basic_memory.sync.watch_service import WatchService

console = Console()


@dataclass
class ValidationIssue:
    file_path: str
    error: str


async def get_sync_service(db_type=DatabaseType.FILESYSTEM):  # pragma: no cover
    """Get sync service instance with all dependencies."""
    async with db.engine_session_factory(db_path=config.database_path, db_type=db_type) as (
        engine,
        session_maker,
    ):
        entity_parser = EntityParser(config.home)
        markdown_processor = MarkdownProcessor(entity_parser)
        file_service = FileService(config.home, markdown_processor)

        # Initialize repositories
        entity_repository = EntityRepository(session_maker)
        observation_repository = ObservationRepository(session_maker)
        relation_repository = RelationRepository(session_maker)
        search_repository = SearchRepository(session_maker)

        # Initialize services
        search_service = SearchService(search_repository, entity_repository, file_service)
        link_resolver = LinkResolver(entity_repository, search_service)

        # Initialize scanner
        file_change_scanner = FileChangeScanner(entity_repository)

        # Initialize services
        entity_service = EntityService(
            entity_parser,
            entity_repository,
            observation_repository,
            relation_repository,
            file_service,
            link_resolver,
        )

        # Create sync service
        sync_service = SyncService(
            scanner=file_change_scanner,
            entity_service=entity_service,
            entity_parser=entity_parser,
            entity_repository=entity_repository,
            relation_repository=relation_repository,
            search_service=search_service,
        )

        return sync_service


def group_issues_by_directory(issues: List[ValidationIssue]) -> Dict[str, List[ValidationIssue]]:
    """Group validation issues by directory."""
    grouped = defaultdict(list)
    for issue in issues:
        dir_name = Path(issue.file_path).parent.name
        grouped[dir_name].append(issue)
    return dict(grouped)


def display_sync_summary(knowledge: SyncReport):
    """Display a one-line summary of sync changes."""
    total_changes = knowledge.total_changes
    if total_changes == 0:
        console.print("[green]Everything up to date[/green]")
        return

    # Format as: "Synced X files (A new, B modified, C moved, D deleted)"
    changes = []
    new_count = len(knowledge.new)
    mod_count = len(knowledge.modified)
    move_count = len(knowledge.moves)
    del_count = len(knowledge.deleted)

    if new_count:
        changes.append(f"[green]{new_count} new[/green]")
    if mod_count:
        changes.append(f"[yellow]{mod_count} modified[/yellow]")
    if move_count:
        changes.append(f"[blue]{move_count} moved[/blue]")
    if del_count:
        changes.append(f"[red]{del_count} deleted[/red]")

    console.print(f"Synced {total_changes} files ({', '.join(changes)})")


def display_detailed_sync_results(knowledge: SyncReport):
    """Display detailed sync results with trees."""
    if knowledge.total_changes == 0:
        console.print("\n[green]Everything up to date[/green]")
        return

    console.print("\n[bold]Sync Results[/bold]")

    if knowledge.total_changes > 0:
        knowledge_tree = Tree("[bold]Knowledge Files[/bold]")
        if knowledge.new:
            created = knowledge_tree.add("[green]Created[/green]")
            for path in sorted(knowledge.new):
                checksum = knowledge.checksums.get(path, "")
                created.add(f"[green]{path}[/green] ({checksum[:8]})")
        if knowledge.modified:
            modified = knowledge_tree.add("[yellow]Modified[/yellow]")
            for path in sorted(knowledge.modified):
                checksum = knowledge.checksums.get(path, "")
                modified.add(f"[yellow]{path}[/yellow] ({checksum[:8]})")
        if knowledge.moves:
            moved = knowledge_tree.add("[blue]Moved[/blue]")
            for old_path, new_path in sorted(knowledge.moves.items()):
                checksum = knowledge.checksums.get(new_path, "")
                moved.add(f"[blue]{old_path}[/blue] → [blue]{new_path}[/blue] ({checksum[:8]})")
        if knowledge.deleted:
            deleted = knowledge_tree.add("[red]Deleted[/red]")
            for path in sorted(knowledge.deleted):
                deleted.add(f"[red]{path}[/red]")
        console.print(knowledge_tree)


async def run_sync(verbose: bool = False, watch: bool = False):
    """Run sync operation."""
    sync_service = await get_sync_service()

    # Start watching if requested
    if watch:
        watch_service = WatchService(
            sync_service=sync_service,
            file_service=sync_service.entity_service.file_service,
            config=config,
        )
        await watch_service.handle_changes(config.home)
        await watch_service.run()  # pragma: no cover
    else:
        # one time sync
        knowledge_changes = await sync_service.sync(config.home)
        # Display results
        if verbose:
            display_detailed_sync_results(knowledge_changes)
        else:
            display_sync_summary(knowledge_changes)  # pragma: no cover


@app.command()
def sync(
    verbose: bool = typer.Option(
        False,
        "--verbose",
        "-v",
        help="Show detailed sync information.",
    ),
    watch: bool = typer.Option(
        False,
        "--watch",
        "-w",
        help="Start watching for changes after sync.",
    ),
) -> None:
    """Sync knowledge files with the database."""
    try:
        # Run sync
        asyncio.run(run_sync(verbose=verbose, watch=watch))

    except Exception as e:  # pragma: no cover
        if not isinstance(e, typer.Exit):
            logger.exception("Sync failed")
            typer.echo(f"Error during sync: {e}", err=True)
            raise typer.Exit(1)
        raise