"""Credential-pool auth subcommands."""

from __future__ import annotations

from getpass import getpass
import math
import time
from types import SimpleNamespace
import uuid

from agent.credential_pool import (
    AUTH_TYPE_API_KEY,
    AUTH_TYPE_OAUTH,
    CUSTOM_POOL_PREFIX,
    SOURCE_MANUAL,
    STATUS_EXHAUSTED,
    STRATEGY_FILL_FIRST,
    STRATEGY_ROUND_ROBIN,
    STRATEGY_RANDOM,
    STRATEGY_LEAST_USED,
    SUPPORTED_POOL_STRATEGIES,
    PooledCredential,
    _normalize_custom_pool_name,
    get_pool_strategy,
    label_from_token,
    list_custom_pool_providers,
    load_pool,
    _exhausted_ttl,
)
import hermes_cli.auth as auth_mod
from hermes_cli.auth import PROVIDER_REGISTRY
from hermes_constants import OPENROUTER_BASE_URL


# Providers that support OAuth login in addition to API keys.
_OAUTH_CAPABLE_PROVIDERS = {"anthropic", "nous", "openai-codex"}


def _get_custom_provider_names() -> list:
    """Return list of (display_name, pool_key) tuples for custom_providers in config."""
    try:
        from hermes_cli.config import load_config

        config = load_config()
    except Exception:
        return []
    custom_providers = config.get("custom_providers")
    if not isinstance(custom_providers, list):
        return []
    result = []
    for entry in custom_providers:
        if not isinstance(entry, dict):
            continue
        name = entry.get("name")
        if not isinstance(name, str) or not name.strip():
            continue
        pool_key = f"{CUSTOM_POOL_PREFIX}{_normalize_custom_pool_name(name)}"
        result.append((name.strip(), pool_key))
    return result


def _resolve_custom_provider_input(raw: str) -> str | None:
    """If raw input matches a custom_providers entry name (case-insensitive), return its pool key."""
    normalized = (raw or "").strip().lower().replace(" ", "-")
    if not normalized:
        return None
    # Direct match on 'custom:name' format
    if normalized.startswith(CUSTOM_POOL_PREFIX):
        return normalized
    for display_name, pool_key in _get_custom_provider_names():
        if _normalize_custom_pool_name(display_name) == normalized:
            return pool_key
    return None


def _normalize_provider(provider: str) -> str:
    normalized = (provider or "").strip().lower()
    if normalized in {"or", "open-router"}:
        return "openrouter"
    # Check if it matches a custom provider name
    custom_key = _resolve_custom_provider_input(normalized)
    if custom_key:
        return custom_key
    return normalized


def _provider_base_url(provider: str) -> str:
    if provider == "openrouter":
        return OPENROUTER_BASE_URL
    if provider.startswith(CUSTOM_POOL_PREFIX):
        from agent.credential_pool import _get_custom_provider_config

        cp_config = _get_custom_provider_config(provider)
        if cp_config:
            return str(cp_config.get("base_url") or "").strip()
        return ""
    pconfig = PROVIDER_REGISTRY.get(provider)
    return pconfig.inference_base_url if pconfig else ""


def _oauth_default_label(provider: str, count: int) -> str:
    return f"{provider}-oauth-{count}"


def _api_key_default_label(count: int) -> str:
    return f"api-key-{count}"


def _display_source(source: str) -> str:
    return source.split(":", 1)[1] if source.startswith("manual:") else source


def _format_exhausted_status(entry) -> str:
    if entry.last_status != STATUS_EXHAUSTED:
        return ""
    code = f" ({entry.last_error_code})" if entry.last_error_code else ""
    if not entry.last_status_at:
        return f" exhausted{code}"
    remaining = max(0, int(math.ceil((entry.last_status_at + _exhausted_ttl(entry.last_error_code)) - time.time())))
    if remaining <= 0:
        return f" exhausted{code} (ready to retry)"
    minutes, seconds = divmod(remaining, 60)
    hours, minutes = divmod(minutes, 60)
    if hours:
        wait = f"{hours}h {minutes}m"
    elif minutes:
        wait = f"{minutes}m {seconds}s"
    else:
        wait = f"{seconds}s"
    return f" exhausted{code} ({wait} left)"


def auth_add_command(args) -> None:
    provider = _normalize_provider(getattr(args, "provider", ""))
    if provider not in PROVIDER_REGISTRY and provider != "openrouter" and not provider.startswith(CUSTOM_POOL_PREFIX):
        raise SystemExit(f"Unknown provider: {provider}")

    requested_type = str(getattr(args, "auth_type", "") or "").strip().lower()
    if requested_type in {AUTH_TYPE_API_KEY, "api-key"}:
        requested_type = AUTH_TYPE_API_KEY
    if not requested_type:
        if provider.startswith(CUSTOM_POOL_PREFIX):
            requested_type = AUTH_TYPE_API_KEY
        else:
            requested_type = AUTH_TYPE_OAUTH if provider in {"anthropic", "nous", "openai-codex"} else AUTH_TYPE_API_KEY

    pool = load_pool(provider)

    if requested_type == AUTH_TYPE_API_KEY:
        token = (getattr(args, "api_key", None) or "").strip()
        if not token:
            token = getpass("Paste your API key: ").strip()
        if not token:
            raise SystemExit("No API key provided.")
        default_label = _api_key_default_label(len(pool.entries()) + 1)
        label = (getattr(args, "label", None) or "").strip()
        if not label:
            label = input(f"Label (optional, default: {default_label}): ").strip() or default_label
        entry = PooledCredential(
            provider=provider,
            id=uuid.uuid4().hex[:6],
            label=label,
            auth_type=AUTH_TYPE_API_KEY,
            priority=0,
            source=SOURCE_MANUAL,
            access_token=token,
            base_url=_provider_base_url(provider),
        )
        pool.add_entry(entry)
        print(f'Added {provider} credential #{len(pool.entries())}: "{label}"')
        return

    if provider == "anthropic":
        from agent import anthropic_adapter as anthropic_mod

        creds = anthropic_mod.run_hermes_oauth_login_pure()
        if not creds:
            raise SystemExit("Anthropic OAuth login did not return credentials.")
        label = (getattr(args, "label", None) or "").strip() or label_from_token(
            creds["access_token"],
            _oauth_default_label(provider, len(pool.entries()) + 1),
        )
        entry = PooledCredential(
            provider=provider,
            id=uuid.uuid4().hex[:6],
            label=label,
            auth_type=AUTH_TYPE_OAUTH,
            priority=0,
            source=f"{SOURCE_MANUAL}:hermes_pkce",
            access_token=creds["access_token"],
            refresh_token=creds.get("refresh_token"),
            expires_at_ms=creds.get("expires_at_ms"),
            base_url=_provider_base_url(provider),
        )
        pool.add_entry(entry)
        print(f'Added {provider} OAuth credential #{len(pool.entries())}: "{entry.label}"')
        return

    if provider == "nous":
        creds = auth_mod._nous_device_code_login(
            portal_base_url=getattr(args, "portal_url", None),
            inference_base_url=getattr(args, "inference_url", None),
            client_id=getattr(args, "client_id", None),
            scope=getattr(args, "scope", None),
            open_browser=not getattr(args, "no_browser", False),
            timeout_seconds=getattr(args, "timeout", None) or 15.0,
            insecure=bool(getattr(args, "insecure", False)),
            ca_bundle=getattr(args, "ca_bundle", None),
            min_key_ttl_seconds=max(60, int(getattr(args, "min_key_ttl_seconds", 5 * 60))),
        )
        label = (getattr(args, "label", None) or "").strip() or label_from_token(
            creds.get("access_token", ""),
            _oauth_default_label(provider, len(pool.entries()) + 1),
        )
        entry = PooledCredential.from_dict(provider, {
            **creds,
            "label": label,
            "auth_type": AUTH_TYPE_OAUTH,
            "source": f"{SOURCE_MANUAL}:device_code",
            "base_url": creds.get("inference_base_url"),
        })
        pool.add_entry(entry)
        print(f'Added {provider} OAuth credential #{len(pool.entries())}: "{entry.label}"')
        return

    if provider == "openai-codex":
        creds = auth_mod._codex_device_code_login()
        label = (getattr(args, "label", None) or "").strip() or label_from_token(
            creds["tokens"]["access_token"],
            _oauth_default_label(provider, len(pool.entries()) + 1),
        )
        entry = PooledCredential(
            provider=provider,
            id=uuid.uuid4().hex[:6],
            label=label,
            auth_type=AUTH_TYPE_OAUTH,
            priority=0,
            source=f"{SOURCE_MANUAL}:device_code",
            access_token=creds["tokens"]["access_token"],
            refresh_token=creds["tokens"].get("refresh_token"),
            base_url=creds.get("base_url"),
            last_refresh=creds.get("last_refresh"),
        )
        pool.add_entry(entry)
        print(f'Added {provider} OAuth credential #{len(pool.entries())}: "{entry.label}"')
        return

    raise SystemExit(f"`hermes auth add {provider}` is not implemented for auth type {requested_type} yet.")


def auth_list_command(args) -> None:
    provider_filter = _normalize_provider(getattr(args, "provider", "") or "")
    if provider_filter:
        providers = [provider_filter]
    else:
        providers = sorted({
            *PROVIDER_REGISTRY.keys(),
            "openrouter",
            *list_custom_pool_providers(),
        })
    for provider in providers:
        pool = load_pool(provider)
        entries = pool.entries()
        if not entries:
            continue
        current = pool.peek()
        print(f"{provider} ({len(entries)} credentials):")
        for idx, entry in enumerate(entries, start=1):
            marker = "  "
            if current is not None and entry.id == current.id:
                marker = "← "
            status = _format_exhausted_status(entry)
            source = _display_source(entry.source)
            print(f"  #{idx}  {entry.label:<20} {entry.auth_type:<7} {source}{status} {marker}".rstrip())
        print()


def auth_remove_command(args) -> None:
    provider = _normalize_provider(getattr(args, "provider", ""))
    index = int(getattr(args, "index"))
    pool = load_pool(provider)
    removed = pool.remove_index(index)
    if removed is None:
        raise SystemExit(f"No credential #{index} for provider {provider}.")
    print(f"Removed {provider} credential #{index} ({removed.label})")


def auth_reset_command(args) -> None:
    provider = _normalize_provider(getattr(args, "provider", ""))
    pool = load_pool(provider)
    count = pool.reset_statuses()
    print(f"Reset status on {count} {provider} credentials")


def _interactive_auth() -> None:
    """Interactive credential pool management when `hermes auth` is called bare."""
    # Show current pool status first
    print("Credential Pool Status")
    print("=" * 50)

    auth_list_command(SimpleNamespace(provider=None))
    print()

    # Main menu
    choices = [
        "Add a credential",
        "Remove a credential",
        "Reset cooldowns for a provider",
        "Set rotation strategy for a provider",
        "Exit",
    ]
    print("What would you like to do?")
    for i, choice in enumerate(choices, 1):
        print(f"  {i}. {choice}")

    try:
        raw = input("\nChoice: ").strip()
    except (EOFError, KeyboardInterrupt):
        return

    if not raw or raw == str(len(choices)):
        return

    if raw == "1":
        _interactive_add()
    elif raw == "2":
        _interactive_remove()
    elif raw == "3":
        _interactive_reset()
    elif raw == "4":
        _interactive_strategy()


def _pick_provider(prompt: str = "Provider") -> str:
    """Prompt for a provider name with auto-complete hints."""
    known = sorted(set(list(PROVIDER_REGISTRY.keys()) + ["openrouter"]))
    custom_names = _get_custom_provider_names()
    if custom_names:
        custom_display = [name for name, _key in custom_names]
        print(f"\nKnown providers: {', '.join(known)}")
        print(f"Custom endpoints: {', '.join(custom_display)}")
    else:
        print(f"\nKnown providers: {', '.join(known)}")
    try:
        raw = input(f"{prompt}: ").strip()
    except (EOFError, KeyboardInterrupt):
        raise SystemExit()
    return _normalize_provider(raw)


def _interactive_add() -> None:
    provider = _pick_provider("Provider to add credential for")
    if provider not in PROVIDER_REGISTRY and provider != "openrouter" and not provider.startswith(CUSTOM_POOL_PREFIX):
        raise SystemExit(f"Unknown provider: {provider}")

    # For OAuth-capable providers, ask which type
    if provider in _OAUTH_CAPABLE_PROVIDERS:
        print(f"\n{provider} supports both API keys and OAuth login.")
        print("  1. API key (paste a key from the provider dashboard)")
        print("  2. OAuth login (authenticate via browser)")
        try:
            type_choice = input("Type [1/2]: ").strip()
        except (EOFError, KeyboardInterrupt):
            return
        if type_choice == "2":
            auth_type = "oauth"
        else:
            auth_type = "api_key"
    else:
        auth_type = "api_key"

    auth_add_command(SimpleNamespace(
        provider=provider, auth_type=auth_type, label=None, api_key=None,
        portal_url=None, inference_url=None, client_id=None, scope=None,
        no_browser=False, timeout=None, insecure=False, ca_bundle=None,
    ))


def _interactive_remove() -> None:
    provider = _pick_provider("Provider to remove credential from")
    pool = load_pool(provider)
    if not pool.has_credentials():
        print(f"No credentials for {provider}.")
        return

    # Show entries with indices
    for i, e in enumerate(pool.entries(), 1):
        exhausted = _format_exhausted_status(e)
        print(f"  #{i}  {e.label:25s} {e.auth_type:10s} {e.source}{exhausted}")

    try:
        raw = input("Remove # (or blank to cancel): ").strip()
    except (EOFError, KeyboardInterrupt):
        return
    if not raw:
        return

    try:
        index = int(raw)
    except ValueError:
        print("Invalid number.")
        return

    auth_remove_command(SimpleNamespace(provider=provider, index=index))


def _interactive_reset() -> None:
    provider = _pick_provider("Provider to reset cooldowns for")

    auth_reset_command(SimpleNamespace(provider=provider))


def _interactive_strategy() -> None:
    provider = _pick_provider("Provider to set strategy for")
    current = get_pool_strategy(provider)
    strategies = [STRATEGY_FILL_FIRST, STRATEGY_ROUND_ROBIN, STRATEGY_LEAST_USED, STRATEGY_RANDOM]

    print(f"\nCurrent strategy for {provider}: {current}")
    print()
    descriptions = {
        STRATEGY_FILL_FIRST: "Use first key until exhausted, then next",
        STRATEGY_ROUND_ROBIN: "Cycle through keys evenly",
        STRATEGY_LEAST_USED: "Always pick the least-used key",
        STRATEGY_RANDOM: "Random selection",
    }
    for i, s in enumerate(strategies, 1):
        marker = " ←" if s == current else ""
        print(f"  {i}. {s:15s} — {descriptions.get(s, '')}{marker}")

    try:
        raw = input("\nStrategy [1-4]: ").strip()
    except (EOFError, KeyboardInterrupt):
        return
    if not raw:
        return

    try:
        idx = int(raw) - 1
        strategy = strategies[idx]
    except (ValueError, IndexError):
        print("Invalid choice.")
        return

    from hermes_cli.config import load_config, save_config
    cfg = load_config()
    pool_strategies = cfg.get("credential_pool_strategies") or {}
    if not isinstance(pool_strategies, dict):
        pool_strategies = {}
    pool_strategies[provider] = strategy
    cfg["credential_pool_strategies"] = pool_strategies
    save_config(cfg)
    print(f"Set {provider} strategy to: {strategy}")


def auth_command(args) -> None:
    action = getattr(args, "auth_action", "")
    if action == "add":
        auth_add_command(args)
        return
    if action == "list":
        auth_list_command(args)
        return
    if action == "remove":
        auth_remove_command(args)
        return
    if action == "reset":
        auth_reset_command(args)
        return
    # No subcommand — launch interactive mode
    _interactive_auth()