"""What the node hosts: groups, their directories (roots) and their keys."""

import sys
from pathlib import Path

from meshbay_node.cli.api import _daemon_api, _resolve_group
from meshbay_node.config import DEFAULT_CONFIG_PATH, load_config


def group(args) -> None:
    if args.subcommand in (None, "list"):
        # Milestone 14.2.
        cfg = load_config(args.config or DEFAULT_CONFIG_PATH)
        out = _daemon_api(cfg, "/api/groups")
        groups = out.get("groups", [])
        if not groups:
            print("no groups hosted — add one with: "
                  "meshbay-node group add <name> --dir <path>")
            return
        for g in groups:
            key = "GEK" if g.get("has_gek") else "NO KEY"
            print(f"  {g['name']}  [{g['visibility']}/{g.get('join_policy')}]  "
                  f"{key}  {g['file_count']} file(s)  "
                  f"{g.get('peers', 0)} peer(s)")
            print(f"      {g['id']}")
            for r in g.get("roots", []):
                flags = []
                if r.get("writable"):
                    flags.append("rw")
                else:
                    flags.append("ro")
                if r.get("removable"):
                    flags.append("removable")
                if r.get("ejected"):
                    flags.append("ejected")
                flag_str = f" ({', '.join(flags)})" if flags else ""
                live = "" if r.get("available", True) else "  [UNAVAILABLE]"
                print(f"      root {r['name']}{flag_str}{live}")
            if not g.get("has_gek"):
                print(f"      give it a key:  meshbay-node gek init "
                      f"--group {g['name']}")
        return

    if args.subcommand == "remove":
        if not args.target:
            print("usage: meshbay-node group remove <name>")
            sys.exit(1)
        cfg = load_config(args.config or DEFAULT_CONFIG_PATH)
        if not args.yes:
            answer = input(f"Remove group '{args.target}' from this node? [y/N] ")
            if answer.lower() not in ("y", "yes"):
                print("cancelled")
                return
        out = _daemon_api(cfg, "/api/groups/detach", method="POST",
                          body={"name": args.target})
        print(f"{out['name']} ({out['group_id'][:8]}) removed from {out['config']}")
        print()
        print("Restart the daemon to stop hosting it:")
        print("  meshbay-node restart-daemon")
        return

    if args.subcommand != "add":
        print("usage: meshbay-node group list|add|remove <name>")
        sys.exit(1)
    if not args.target or not args.dir:
        print("usage: meshbay-node group add <name> --dir <path> "
              "[--no-writable]")
        print()
        print("The group must already exist on the hub and be yours. This")
        print("only tells the node to host it, and picks its first")
        print("directory, which accepts uploads unless --no-writable.")
        print("Add more with:  meshbay-node root add <path> [--writable]")
        sys.exit(1)

    cfg = load_config(args.config or DEFAULT_CONFIG_PATH)
    # Writable unless the operator says otherwise: a brand-new group that
    # cannot receive a single file until its owner finds a second command
    # is not a working group. Every root added *later* is read-only by
    # default, which is the opposite rule and the right one there.
    writable = args.writable is not False
    body = {"name": args.target, "shared_dir": args.dir,
            "writable": writable}
    out = _daemon_api(cfg, "/api/groups/attach", method="POST", body=body)
    print(f"{out['name']} ({out['group_id'][:8]}) added to {out['config']}")
    print(f"  shared_dir   {out['shared_dir']}"
          f"  ({'read-write' if writable else 'read-only'})")
    print()
    print("Tell the daemon to re-read its config, then give the group a key:")
    print("  meshbay-node reload")
    print(f"  meshbay-node gek init --group {out['name']}")
    print()
    print("The key is this group's own — members of your other groups cannot")
    print("read it, and joining one says nothing about the other.")
    return


def root(args) -> None:
    cfg = load_config(args.config or DEFAULT_CONFIG_PATH)
    sub = args.subcommand or "list"
    group_id = _resolve_group(cfg, args.group)

    if sub == "list":
        out = _daemon_api(cfg, "/api/groups")
        group = next((g for g in out.get("groups", [])
                      if g["id"] == group_id), None)
        if not group:
            print(f"group {group_id[:8]} not hosted on this node")
            sys.exit(1)
        roots = group.get("roots", [])
        if not roots:
            print("no roots configured")
            print(f"add one:  meshbay-node root add /path/to/dir --group {group_id}")
            return
        for r in roots:
            flags = []
            if r.get("writable"):
                flags.append("rw")
            else:
                flags.append("ro")
            if r.get("removable"):
                flags.append("removable")
            if r.get("ejected"):
                flags.append("EJECTED")
            avail = "available" if r.get("available", True) else "UNAVAILABLE"
            flags.append(avail)
            print(f"  {r['name']:<20} {', '.join(flags)}")
            print(f"    {r.get('path', '?')}")
        return

    if sub == "add":
        path = args.target
        if not path:
            print("usage: meshbay-node root add <path> [--name NAME] "
                  "[--writable] [--removable] [--group NAME]")
            sys.exit(1)
        body = {
            "path": path,
            "name": args.name or Path(path).name,
            "writable": args.writable if args.writable is not None else True,
            "removable": bool(args.removable),
        }
        _daemon_api(cfg, f"/api/groups/{group_id}/roots",
                    method="POST", body=body)
        w = "rw" if body["writable"] else "ro"
        rm = ", removable" if body["removable"] else ""
        print(f"added root {body['name']} → {path} ({w}{rm})")
        print("reload the daemon to start indexing:")
        print("  meshbay-node reload")
        return

    if sub == "remove":
        name = args.target
        if not name:
            print("usage: meshbay-node root remove <name> [--group NAME]")
            sys.exit(1)
        if not args.yes:
            print(f"Remove root '{name}' from group {group_id[:8]}?")
            print("Files on disk are untouched; only the node config changes.")
            if input("remove? [y/N] ").strip().lower() not in ("y", "yes"):
                print("cancelled")
                return
        _daemon_api(cfg, f"/api/groups/{group_id}/roots/{name}",
                    method="DELETE")
        print(f"removed root {name}")
        print("reload the daemon to apply:")
        print("  meshbay-node reload")
        return

    if sub == "set":
        name = args.target
        if not name:
            print("usage: meshbay-node root set <name> "
                  "[--writable|--no-writable] "
                  "[--removable|--no-removable] [--group NAME]")
            sys.exit(1)
        body = {}
        if args.writable is not None:
            body["writable"] = args.writable
        if args.removable is not None:
            body["removable"] = args.removable
        if not body:
            print("nothing to change — pass --writable/--no-writable "
                  "or --removable/--no-removable")
            sys.exit(1)
        _daemon_api(cfg, f"/api/groups/{group_id}/roots/{name}",
                    method="PATCH", body=body)
        changes = ", ".join(f"{k}={v}" for k, v in body.items())
        print(f"updated root {name}: {changes}")
        return

    if sub == "eject":
        name = args.target
        if not name:
            print("usage: meshbay-node root eject <name> [--group NAME]")
            sys.exit(1)
        _daemon_api(cfg, f"/api/groups/{group_id}/roots/{name}/eject",
                    method="PUT")
        print(f"ejected root {name} — files are hidden until plugged back")
        return

    if sub == "plug":
        name = args.target
        if not name:
            print("usage: meshbay-node root plug <name> [--group NAME]")
            sys.exit(1)
        _daemon_api(cfg, f"/api/groups/{group_id}/roots/{name}/plug",
                    method="PUT")
        print(f"plugged root {name} — files are visible again")
        return

    print("usage: meshbay-node root list|add|remove|set|eject|plug [name] "
          "[--group NAME]")
    sys.exit(1)


def gek(args) -> None:
    # `gek-init` is the original spelling and still works. `gek rotate` is
    # the one that matters after a revocation: the ex-member holds the
    # current key and nothing else takes it from them.
    sub = "init" if args.command == "gek-init" else (args.subcommand or "init")
    if sub not in ("init", "rotate"):
        print("usage: meshbay-node gek init|rotate [--group NAME]")
        sys.exit(1)

    cfg = load_config(args.config or DEFAULT_CONFIG_PATH)
    group_id = _resolve_group(cfg, args.group)

    if sub == "rotate" and not args.yes:
        print("Rotating replaces this group's key.")
        print("  · every member re-receives it automatically on their next connect")
        print("  · anyone revoked keeps the OLD key and loses access to new content")
        print("  · content already downloaded stays readable to whoever has it")
        if input("rotate now? [y/N] ").strip().lower() not in ("y", "yes"):
            print("cancelled")
            return

    out = _daemon_api(cfg, f"/api/groups/{group_id}/gek"
                           f"{'?rotate=true' if sub == 'rotate' else ''}",
                      method="POST", timeout=60)

    verb = "rotated" if out.get("rotated") else "ready"
    print(f"GEK {verb} for {group_id}")
    print(f"  {out.get('authorized_members', 0)} authorized member(s) — each "
          f"receives the key on connect")
    for err in out.get("errors") or []:
        print(f"  ! {err}")
    return