# =================== AIPass ====================
# Name: memory.py
# Description: Entry point CLI for drone @memory
# Version: 1.0.0
# Created: 2026-03-08
# Modified: 2026-03-08
# =============================================

"""
Memory System - Central Memory Archive & Rollover System

PURPOSE: Manages memory rollover, archival, and retrieval across all AIPass branches.

ARCHITECTURE:
- Entry point auto-discovers modules
- Modules orchestrate workflow by calling handlers
- Handlers implement domain-specific business logic
"""

import os
import sys
import time
import signal

from pathlib import Path
from typing import List, Any
import importlib

if sys.platform == "win32":
    os.environ.setdefault("PYTHONUTF8", "1")
    for _stream in (sys.stdout, sys.stderr):
        _reconfigure = getattr(_stream, "reconfigure", None)
        if _reconfigure is not None:
            _reconfigure(encoding="utf-8", errors="replace")

from rich.panel import Panel
from rich import box
from rich.table import Table

from aipass.prax import logger
from aipass.cli.apps.modules import console, error

# =============================================================================
# INFRASTRUCTURE SETUP
# =============================================================================

# Package name for module discovery (relative imports within this package)
_PACKAGE_BASE = "aipass.memory.apps.modules"


# =============================================================================
# INTROSPECTION DISPLAY
# =============================================================================


def print_introspection():
    """Display discovered modules and status"""
    console.print()
    console.print("[bold cyan]Memory - Central Memory Archive System[/bold cyan]")
    console.print()
    console.print("[dim]Manages memory rollover and archival across AIPass branches[/dim]")
    console.print()

    # Discover modules
    modules = discover_modules()

    console.print(f"[bold cyan]Discovered Modules:[/bold cyan] {len(modules)}")
    console.print()

    for module in modules:
        module_name = module.__name__.split(".")[-1]
        console.print(f"  [cyan]*[/cyan] {module_name}")

    if not modules:
        console.print("  [dim]No modules discovered yet[/dim]")

    console.print()
    console.print("[dim]Run 'drone @memory --help' for usage information[/dim]")
    console.print()


# =============================================================================
# HELP SYSTEM
# =============================================================================


def print_help():
    """Display Rich-formatted help"""

    console.print()
    console.print(
        Panel.fit(
            "[bold cyan]Memory - Central Memory Archive System[/bold cyan]\n"
            "[dim]Vector search, memory rollover, and fragmented memory for AIPass[/dim]",
            border_style="cyan",
            box=box.ROUNDED,
        )
    )
    console.print()

    # What is Memory section
    what_content = (
        "Memory is the [bold]central memory archive[/bold] that:\n\n"
        "  [green]>[/green] Provides semantic search across all branch memories\n"
        "  [green]>[/green] Archives memories when branches hit rollover limits"
    )
    console.print(
        Panel(what_content, title="[bold cyan]What is Memory?[/bold cyan]", border_style="dim", box=box.ROUNDED)
    )
    console.print()

    console.print("[bold cyan]AVAILABLE COMMANDS:[/bold cyan]")
    console.print()

    # Commands table showing actual drone commands
    table = Table(show_header=True, header_style="bold cyan", border_style="dim")
    table.add_column("Command", style="green")
    table.add_column("Description", style="dim")

    # Core commands — only those with backing modules
    table.add_row("rollover", "Show rollover module introspection")
    table.add_row("rollover run", "Execute memory rollover")
    table.add_row("rollover status", "Show rollover statistics")
    table.add_row("rollover check", "Dry run — check what needs rollover")
    table.add_row("rollover sync-lines", "Update line count metadata")
    table.add_row("rollover push", "⚠ Reset ALL per_branch limits to defaults (system-wide)")
    table.add_row("search <query>", "Semantic search across all branch memories")
    table.add_row("symbolic <subcommand>", "Symbolic/fragmented memory extraction and search")
    table.add_row("templates <subcommand>", "Living template push, diff, and status")
    table.add_row("pool process", "Process pool files + check/run rollover")
    table.add_row("pool status", "Show pool file count, config, vector stats")
    table.add_row("verify <plan_label>", "Check if a plan is vectorized in ChromaDB")
    table.add_row("lint [@branch]", "Audit .trinity entries for over-limit violations (read-only)")
    table.add_row("watch", "Start memory watcher (auto-rollover on changes)")

    console.print(table)

    console.print()
    console.print("-" * 70)
    console.print()

    console.print("[bold cyan]USAGE:[/bold cyan]")
    console.print()
    console.print("  [bold]Via Drone (recommended):[/bold]")
    console.print('    [dim]drone @memory search "performance patterns"[/dim]')
    console.print("    [dim]drone @memory rollover status[/dim]")
    console.print("    [dim]drone @memory rollover run[/dim]")
    console.print()
    console.print("  [bold]Direct execution:[/bold]")
    console.print('    [dim]drone @memory search "query"[/dim]')
    console.print("    [dim]drone @memory rollover run[/dim]")
    console.print()
    console.print("-" * 70)
    console.print()

    console.print("[bold cyan]SEARCH OPTIONS:[/bold cyan]")
    console.print()
    console.print("  [cyan]--branch BRANCH[/cyan]    Filter by branch (e.g., SEEDGO, CLI)")
    console.print("  [cyan]--type TYPE[/cyan]        Filter by memory type (observations, local)")
    console.print("  [cyan]--n N[/cyan]              Number of results (default: 5)")
    console.print()
    console.print("  [bold]Example:[/bold]")
    console.print('    [dim]drone @memory search "registry bugs" --branch SEEDGO --n 10[/dim]')
    console.print()
    console.print("-" * 70)
    console.print()

    console.print("[bold cyan]WATCH MODE:[/bold cyan]")
    console.print()
    console.print("  [bold]Start memory file watcher:[/bold]")
    console.print("    [dim]drone @memory watch[/dim]")
    console.print("    [dim]Monitors all branches, auto-rolls when limit exceeded[/dim]")
    console.print("    [dim]Press Ctrl+C to stop[/dim]")
    console.print()

    console.print("-" * 70)
    console.print()

    console.print(
        "Commands: search, rollover [run|status|check|sync-lines|push], lint,"
        " pool [process|status], symbolic, templates, verify, watch"
    )
    console.print()


# =============================================================================
# MODULE DISCOVERY
# =============================================================================

MODULES_DIR = Path(__file__).parent / "modules"


def discover_modules() -> List[Any]:
    """
    Auto-discover modules in modules/ directory

    Pattern: Any .py file in modules/ that implements handle_command()
    gets automatically discovered and registered.

    Returns:
        List of module objects with handle_command() method
    """
    modules = []

    if not MODULES_DIR.exists():
        return modules

    for file_path in MODULES_DIR.glob("*.py"):
        if file_path.name.startswith("_"):  # Skip __init__.py, __pycache__, etc.
            continue

        module_name = f"{_PACKAGE_BASE}.{file_path.stem}"

        try:
            module = importlib.import_module(module_name)

            # Duck typing: If it has handle_command(), it's a module
            if hasattr(module, "handle_command"):
                modules.append(module)
                logger.info(f"[memory] Discovered module: {module_name}")
        except Exception as e:
            logger.error(f"[memory] Failed to load module {module_name}: {e}")

    return modules


def route_command(command: str, args: List[str], modules: List[Any]) -> bool:
    """
    Route command to appropriate module

    Pattern: Each module's handle_command() returns True if it handled the command

    Args:
        command: Command name (e.g., 'rollover', 'search', 'status')
        args: Additional arguments
        modules: List of discovered modules

    Returns:
        True if command was handled, False otherwise
    """
    # Built-in commands handled by entry point
    if command == "watch":
        start_watch()
        return True

    if command == "push":
        return route_command("rollover", ["push"], modules)

    for module in modules:
        try:
            if module.handle_command(command, args):
                return True
        except Exception as e:
            logger.error(f"[memory] Module {module.__name__} error: {e}")

    return False


# =============================================================================
# WATCH MODE
# =============================================================================


def start_watch() -> None:
    """
    Start memory watcher - monitors branch memory files for auto-rollover

    Watches all branches from AIPASS_REGISTRY.json. When entry counts
    exceed v2 limits, automatically triggers rollover.

    Press Ctrl+C to stop.
    """
    from ..handlers.monitor.memory_watcher import (  # type: ignore[import-not-found]
        start_memory_watcher,
        stop_memory_watcher,
    )
    from ..handlers.monitor.detector import get_rollover_stats  # type: ignore[import-not-found]

    # Signal handler for graceful shutdown
    def signal_handler(sig, frame):
        """Handle SIGINT for graceful watcher shutdown."""
        console.print("\n")
        console.print("[dim]Stopping watcher...[/dim]")
        stop_memory_watcher()
        console.print("[green]>[/green] Watcher stopped")
        sys.exit(0)

    signal.signal(signal.SIGINT, signal_handler)

    console.print()
    console.print(Panel.fit("[bold cyan]Memory - Watch Mode[/bold cyan]", border_style="cyan", box=box.ROUNDED))
    console.print()

    # Start the watcher
    result = start_memory_watcher()

    if not result.get("success"):
        error(f"Failed to start watcher: {result.get('error')}")
        return

    console.print(f"[green]>[/green] Watching {result.get('count', 0)} branch directories")
    console.print("[dim]Auto-rollover enabled when files exceed limits[/dim]")
    console.print("[dim]Press Ctrl+C to stop[/dim]")
    console.print()

    # Show initial status
    stats = get_rollover_stats()
    if stats.get("success"):
        ready = stats.get("files_ready", 0)
        total = stats.get("files_checked", 0)
        status_marker = "[red]![/red]" if ready > 0 else "[green]OK[/green]"
        console.print(f"{status_marker} Current: {total} files monitored, {ready} ready for rollover")
        console.print()

    # Keep running until Ctrl+C
    console.print("[dim]Watcher active. Waiting for file changes...[/dim]")
    while True:
        time.sleep(1)


# =============================================================================
# MAIN ENTRY POINT
# =============================================================================


def main():
    """Main entry point - routes commands or shows help"""

    # Parse arguments
    args = sys.argv[1:]

    # Show introspection when run without arguments
    if len(args) == 0:
        print_introspection()
        return

    # Version flag
    if args[0] in ["--version", "-V"]:
        console.print("memory v1.0.0")
        return

    # Show help only for explicit help flags
    if args[0] in ["--help", "-h", "help"]:
        print_help()
        return

    # Command provided - try to route to modules
    modules = discover_modules()
    command = args[0]
    remaining_args = args[1:] if len(args) > 1 else []

    if remaining_args and remaining_args[0] in ["--help", "-h"]:
        remaining_args = ["--help"]
        for module in modules:
            if module.handle_command(command, remaining_args):
                return
        print_help()
        return

    if route_command(command, remaining_args, modules):
        return  # Module handled it successfully
    else:
        console.print()
        error(f"Unknown command: {command}", suggestion="Run 'drone @memory --help' for available commands")
        console.print()
        return


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        logger.info("[memory] Operation cancelled by user (KeyboardInterrupt)")
        console.print("\n\nOperation cancelled by user")
        sys.exit(0)
    except Exception as e:
        logger.error(f"[memory] Entry point error: {e}", exc_info=True)
        error(str(e))
        sys.exit(1)