"""Status command for basic-memory CLI."""

import json
from typing import Set, Dict
from typing import Annotated, Optional

from mcp.server.fastmcp.exceptions import ToolError
import typer
from loguru import logger
from rich.console import Console
from rich.panel import Panel
from rich.tree import Tree

from basic_memory.cli.app import app
from basic_memory.cli.commands.routing import force_routing, validate_routing_flags
from basic_memory.config import ConfigManager
from basic_memory.mcp.async_client import get_client
from basic_memory.mcp.clients import ProjectClient
from basic_memory.schemas import SyncReportResponse
from basic_memory.mcp.project_context import get_active_project

# Create rich console
console = Console()


def add_files_to_tree(
    tree: Tree, paths: Set[str], style: str, checksums: Dict[str, str] | None = None
):
    """Add files to tree, grouped by directory."""
    # Group by directory
    by_dir = {}
    for path in sorted(paths):
        parts = path.split("/", 1)
        dir_name = parts[0] if len(parts) > 1 else ""
        file_name = parts[1] if len(parts) > 1 else parts[0]
        by_dir.setdefault(dir_name, []).append((file_name, path))

    # Add to tree
    for dir_name, files in sorted(by_dir.items()):
        if dir_name:
            branch = tree.add(f"[bold]{dir_name}/[/bold]")
        else:
            branch = tree

        for file_name, full_path in sorted(files):
            if checksums and full_path in checksums:
                checksum_short = checksums[full_path][:8]
                branch.add(f"[{style}]{file_name}[/{style}] ({checksum_short})")
            else:
                branch.add(f"[{style}]{file_name}[/{style}]")


def group_changes_by_directory(changes: SyncReportResponse) -> Dict[str, Dict[str, int]]:
    """Group changes by directory for summary view."""
    by_dir = {}
    for change_type, paths in [
        ("new", changes.new),
        ("modified", changes.modified),
        ("deleted", changes.deleted),
    ]:
        for path in paths:
            dir_name = path.split("/", 1)[0]
            by_dir.setdefault(dir_name, {"new": 0, "modified": 0, "deleted": 0, "moved": 0})
            by_dir[dir_name][change_type] += 1

    # Handle moves - count in both source and destination directories
    for old_path, new_path in changes.moves.items():
        old_dir = old_path.split("/", 1)[0]
        new_dir = new_path.split("/", 1)[0]
        by_dir.setdefault(old_dir, {"new": 0, "modified": 0, "deleted": 0, "moved": 0})
        by_dir.setdefault(new_dir, {"new": 0, "modified": 0, "deleted": 0, "moved": 0})
        by_dir[old_dir]["moved"] += 1
        if old_dir != new_dir:
            by_dir[new_dir]["moved"] += 1

    return by_dir


def build_directory_summary(counts: Dict[str, int]) -> str:
    """Build summary string for directory changes."""
    parts = []
    if counts["new"]:
        parts.append(f"[green]+{counts['new']} new[/green]")
    if counts["modified"]:
        parts.append(f"[yellow]~{counts['modified']} modified[/yellow]")
    if counts["moved"]:
        parts.append(f"[blue]↔{counts['moved']} moved[/blue]")
    if counts["deleted"]:
        parts.append(f"[red]-{counts['deleted']} deleted[/red]")
    return " ".join(parts)


def display_changes(
    project_name: str, title: str, changes: SyncReportResponse, verbose: bool = False
):
    """Display changes using Rich for better visualization."""
    tree = Tree(f"{project_name}: {title}")

    if changes.total == 0 and not changes.skipped_files:
        tree.add("No changes")
        console.print(Panel(tree, expand=False))
        return

    if verbose:
        # Full file listing with checksums
        if changes.new:
            new_branch = tree.add("[green]New Files[/green]")
            add_files_to_tree(new_branch, changes.new, "green", changes.checksums)
        if changes.modified:
            mod_branch = tree.add("[yellow]Modified[/yellow]")
            add_files_to_tree(mod_branch, changes.modified, "yellow", changes.checksums)
        if changes.moves:
            move_branch = tree.add("[blue]Moved[/blue]")
            for old_path, new_path in sorted(changes.moves.items()):
                move_branch.add(f"[blue]{old_path}[/blue] → [blue]{new_path}[/blue]")
        if changes.deleted:
            del_branch = tree.add("[red]Deleted[/red]")
            add_files_to_tree(del_branch, changes.deleted, "red")
        if changes.skipped_files:
            skip_branch = tree.add("[red]! Skipped (Circuit Breaker)[/red]")
            for skipped in sorted(changes.skipped_files, key=lambda x: x.path):
                skip_branch.add(
                    f"[red]{skipped.path}[/red] "
                    f"(failures: {skipped.failure_count}, reason: {skipped.reason})"
                )
    else:
        # Show directory summaries
        by_dir = group_changes_by_directory(changes)
        for dir_name, counts in sorted(by_dir.items()):
            summary = build_directory_summary(counts)
            if summary:  # Only show directories with changes
                tree.add(f"[bold]{dir_name}/[/bold] {summary}")

        # Show skipped files summary in non-verbose mode
        if changes.skipped_files:
            skip_count = len(changes.skipped_files)
            tree.add(
                f"[red]! {skip_count} file{'s' if skip_count != 1 else ''} "
                f"skipped due to repeated failures[/red]"
            )

    console.print(Panel(tree, expand=False))


async def run_status(
    project: Optional[str] = None,
) -> tuple[str, SyncReportResponse]:
    """Fetch sync status of files vs database.

    Returns (project_name, sync_report) for the caller to render.
    """
    # Resolve default project so get_client() can route per-project
    project = project or ConfigManager().default_project

    async with get_client(project_name=project) as client:
        project_item = await get_active_project(client, project, None)
        sync_report = await ProjectClient(client).get_status(project_item.external_id)
        return project_item.name, sync_report


@app.command()
def status(
    project: Annotated[
        Optional[str],
        typer.Option(help="The project name."),
    ] = None,
    verbose: bool = typer.Option(False, "--verbose", "-v", help="Show detailed file information"),
    json_output: bool = typer.Option(False, "--json", help="Output in JSON format"),
    local: bool = typer.Option(
        False, "--local", help="Force local API routing (ignore cloud mode)"
    ),
    cloud: bool = typer.Option(False, "--cloud", help="Force cloud API routing"),
):
    """Show sync status between files and database.

    Use --json for machine-readable output.
    Use --local to force local routing when cloud mode is enabled.
    Use --cloud to force cloud routing when cloud mode is disabled.
    """
    from basic_memory.cli.commands.command_utils import run_with_cleanup

    try:
        validate_routing_flags(local, cloud)
        # Trigger: no explicit routing flag provided
        # Why: status scans the local filesystem — cloud routing would use the
        #      Docker-internal path stored in the cloud database, which doesn't
        #      exist locally.
        # Outcome: default to local routing unless --cloud was explicitly requested.
        if not local and not cloud:
            local = True
        with force_routing(local=local, cloud=cloud):
            project_name, sync_report = run_with_cleanup(run_status(project))

        if json_output:
            print(json.dumps(sync_report.model_dump(mode="json"), indent=2, default=str))
        else:
            display_changes(project_name, "Status", sync_report, verbose)
    except (ValueError, ToolError) as e:
        if json_output:
            print(json.dumps({"error": str(e)}, indent=2))
        else:
            console.print(f"[red]Error: {e}[/red]")
        raise typer.Exit(code=1)
    except typer.Exit:
        raise
    except Exception as e:
        logger.error(f"Error checking status: {e}")
        if json_output:
            print(json.dumps({"error": str(e)}, indent=2))
        else:
            typer.echo(f"Error checking status: {e}", err=True)
        raise typer.Exit(code=1)  # pragma: no cover