#!/usr/bin/env python3
"""
CLI entry point: manage Arma 3 Server junction/symlink links for downloaded mods.

Usage:
    python link_mods.py status  --group shared
    python link_mods.py link    --group shared
    python link_mods.py unlink  --group shared

Omit --group to list available groups.
"""

import argparse
import sys

from arma_modlist_tools.compat import fix_console_encoding
from arma_modlist_tools.config import load_config
from arma_modlist_tools.linker import get_link_status, link_group, unlink_group, create_junction, remove_junction

fix_console_encoding()


def _available_groups(cfg) -> list[str]:
    if not cfg.downloads.is_dir():
        return []
    return sorted(p.name for p in cfg.downloads.iterdir() if p.is_dir())


def _print_separator(width: int = 60) -> None:
    print("  " + "-" * width)


# ---------------------------------------------------------------------------
# Subcommands
# ---------------------------------------------------------------------------

def cmd_status(cfg, group: str) -> None:
    group_dir = cfg.downloads / group
    if not group_dir.is_dir():
        print(f"ERROR: group folder not found: {group_dir}")
        sys.exit(1)

    status = get_link_status(group_dir, cfg.arma_dir)

    print()
    print(f"  Group  : {group}")
    print(f"  Path   : {group_dir}")
    print(f"  Arma   : {cfg.arma_dir}")
    print()
    print(f"  {'Mod':<50}  Status")
    _print_separator()

    for s in status:
        icon = "[LINKED]" if s["is_linked"] else "[------]"
        print(f"  {s['name']:<50}  {icon}")

    linked = sum(1 for s in status if s["is_linked"])
    print()
    print(f"  {linked} / {len(status)} linked")
    print()


def cmd_link(cfg, group: str) -> None:
    group_dir = cfg.downloads / group
    if not group_dir.is_dir():
        print(f"ERROR: group folder not found: {group_dir}")
        sys.exit(1)

    status = get_link_status(group_dir, cfg.arma_dir)
    if not status:
        print(f"No @Mod folders found in {group_dir}")
        sys.exit(0)

    print()
    print(f"  Linking group: {group}  ->  {cfg.arma_dir}")
    print()

    linked = already_linked = failed = 0

    for s in status:
        if s["is_linked"]:
            print(f"  [=] {s['name']:<48}  already linked")
            already_linked += 1
            continue
        if s["link_path"].exists():
            print(f"  [!] {s['name']:<48}  SKIP — path exists, not a junction")
            failed += 1
            continue
        ok = create_junction(s["link_path"], s["source_path"])
        if ok:
            print(f"  [+] {s['name']:<48}  linked")
            linked += 1
        else:
            print(f"  [X] {s['name']:<48}  FAILED")
            failed += 1

    print()
    print(f"  Done: {linked} linked, {already_linked} already linked, {failed} failed")
    print()


def cmd_unlink(cfg, group: str, yes: bool = False) -> None:
    group_dir = cfg.downloads / group
    if not group_dir.is_dir():
        print(f"ERROR: group folder not found: {group_dir}")
        sys.exit(1)

    status = get_link_status(group_dir, cfg.arma_dir)
    linked_count = sum(1 for s in status if s["is_linked"])

    if linked_count == 0:
        print(f"\n  Nothing to unlink — 0 active links in group '{group}'.\n")
        sys.exit(0)

    print()
    print(f"  WARNING: This will remove {linked_count} link(s) from Arma 3 Server:")
    print(f"    {cfg.arma_dir}")
    print(f"    Group: {group}  ({linked_count} linked mod(s))")
    print()

    if yes:
        print("  (--yes flag set — skipping confirmation)")
    else:
        choice = input("  Continue? [y/N]: ").strip().lower()
        if choice not in ("y", "yes"):
            print("  Aborted.\n")
            sys.exit(0)

    print()

    unlinked = not_linked = failed = 0

    for s in status:
        if not s["is_linked"]:
            print(f"  [=] {s['name']:<48}  not linked")
            not_linked += 1
            continue
        ok, err = remove_junction(s["link_path"])
        if ok:
            print(f"  [-] {s['name']:<48}  unlinked")
            unlinked += 1
        else:
            print(f"  [X] {s['name']:<48}  FAILED: {err}")
            failed += 1

    print()
    print(f"  Done: {unlinked} removed, {not_linked} not linked"
          + (f", {failed} failed" if failed else ""))
    print()


# ---------------------------------------------------------------------------
# Entry point
# ---------------------------------------------------------------------------

def main() -> None:
    cfg = load_config()

    parser = argparse.ArgumentParser(
        description="Manage Arma 3 Server junction/symlink links for downloaded mods."
    )
    parser.add_argument("command", choices=["status", "link", "unlink"])
    parser.add_argument("--group", "-g", metavar="GROUP")
    parser.add_argument("--yes", "-y", action="store_true",
                        help="Skip confirmation prompt (for non-interactive use)")
    args = parser.parse_args()

    if not args.group:
        groups = _available_groups(cfg)
        if groups:
            print(f"\nAvailable groups in '{cfg.downloads}':")
            for g in groups:
                print(f"  {g}")
            print(f"\nUsage: python link_mods.py {args.command} --group <GROUP>\n")
        else:
            print(f"No groups found in '{cfg.downloads}'. Run fetch_mods.py first.")
        sys.exit(0)

    if args.command == "status":
        cmd_status(cfg, args.group)
    elif args.command == "link":
        cmd_link(cfg, args.group)
    elif args.command == "unlink":
        cmd_unlink(cfg, args.group, yes=args.yes)


if __name__ == "__main__":
    main()