from __future__ import annotations

import json
import os
import stat
import time
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any

from yuxi.utils.logging_config import logger


@dataclass
class SetupWizardStep:
    step_id: str
    title: str = ""
    description: str = ""
    required: bool = True
    completed: bool = False
    config_key: str = ""
    config_value: Any = None


@dataclass
class SetupWizardState:
    steps: list[SetupWizardStep] = field(default_factory=list)
    current_step: int = 0

    @property
    def is_complete(self) -> bool:
        return all(s.completed for s in self.steps if s.required)

    @property
    def current(self) -> SetupWizardStep | None:
        if 0 <= self.current_step < len(self.steps):
            return self.steps[self.current_step]
        return None

    def advance(self) -> None:
        if self.current_step < len(self.steps):
            self.steps[self.current_step].completed = True
        self.current_step += 1

    def to_config(self) -> dict[str, Any]:
        config: dict[str, Any] = {}
        for step in self.steps:
            if step.config_key and step.config_value is not None:
                config[step.config_key] = step.config_value
        return config


def create_setup_wizard_steps(config: dict[str, Any] | None = None) -> list[SetupWizardStep]:
    existing = config or {}
    return [
        SetupWizardStep(
            step_id="username",
            title="Bot Username",
            description="Enter your Twitch bot username (lowercase). "
            "This must match the username associated with your Twitch application.",
            required=True,
            completed=bool(existing.get("bot_username")),
            config_key="bot_username",
        ),
        SetupWizardStep(
            step_id="token",
            title="Access Token",
            description="Enter your Twitch IRC access token (oauth:...) or leave blank to use "
            "TWITCH_ACCESS_TOKEN / OPENCLAW_TWITCH_ACCESS_TOKEN env var. "
            "Get it from https://twitchtokengenerator.com/ with scopes: "
            "chat:read, chat:edit, channel:read:subscriptions, moderator:read:followers",
            required=True,
            completed=bool(existing.get("access_token")),
            config_key="access_token",
        ),
        SetupWizardStep(
            step_id="client_id",
            title="Client ID",
            description="Enter your Twitch application Client ID. "
            "Create a Twitch application at https://dev.twitch.tv/console/apps",
            required=True,
            completed=bool(existing.get("client_id")),
            config_key="client_id",
        ),
        SetupWizardStep(
            step_id="client_secret",
            title="Client Secret (Optional)",
            description="Enter your Twitch application Client Secret for EventSub and token refresh. "
            "Required for EventSub events (follows, subs, raids, etc.) and automatic token rotation.",
            required=False,
            completed=bool(existing.get("client_secret")),
            config_key="client_secret",
        ),
        SetupWizardStep(
            step_id="channels",
            title="Channels",
            description="Enter channels to join (comma-separated, e.g. channel1,channel2). "
            "Do NOT include the # prefix — it will be added automatically.",
            required=True,
            completed=bool(existing.get("channels")),
            config_key="channels",
        ),
        SetupWizardStep(
            step_id="refresh_token",
            title="Refresh Token (Optional)",
            description="Enter a refresh token for automatic token rotation, or leave blank to skip. "
            "Required scopes for token refresh: channel:read:subscriptions, chat:read, chat:edit",
            required=False,
            completed=bool(existing.get("refresh_token")),
            config_key="refresh_token",
        ),
        SetupWizardStep(
            step_id="dm_policy",
            title="DM Policy",
            description="DM/whisper policy: 'open' (allow all) or 'pairing' (require approval). Default: 'pairing'",
            required=False,
            completed=bool(existing.get("dm_policy")),
            config_key="dm_policy",
        ),
        SetupWizardStep(
            step_id="group_access",
            title="Group Access Policy",
            description="Group access policy: open / allowlist / disabled / mention_only. Default: 'open'. "
            "'open' = respond to all messages; 'allowlist' = only respond to allowed users; "
            "'mention_only' = only respond when @mentioned",
            required=True,
            completed=bool(existing.get("group_policy")),
            config_key="group_policy",
        ),
        SetupWizardStep(
            step_id="allowed_roles",
            title="Allowed Roles",
            description="Allowed roles for responses (comma-separated): moderator,owner,vip,subscriber,all. "
            "Default: all",
            required=False,
            completed=bool(existing.get("allowedRoles")),
            config_key="allowedRoles",
        ),
        SetupWizardStep(
            step_id="silent",
            title="Silent Mode (ACTION)",
            description="Send messages as /me ACTION instead of normal PRIVMSG. "
            "Type 'yes' to enable, or leave blank for default (no).",
            required=False,
            completed="silent" in existing,
            config_key="silent",
        ),
        SetupWizardStep(
            step_id="probe_timeout",
            title="Probe Timeout (ms)",
            description="Timeout for health probe API calls in milliseconds. Default: 10000 (10s). "
            "Increase if your Twitch API calls are slow.",
            required=False,
            completed=bool(existing.get("probe_timeout_ms")),
            config_key="probe_timeout_ms",
        ),
    ]


def setup_wizard_to_config(state: SetupWizardState) -> dict[str, Any]:
    return state.to_config()


class TwitchSetupWizard:
    def __init__(self, config: dict[str, Any] | None = None):
        self._config = config or {}
        self._state = SetupWizardState()
        self._account_id: str = ""
        self._disabled = False
        self._build_steps()

    def _build_steps(self) -> None:
        self._state.steps = create_setup_wizard_steps(self._config)

    def resolve_account_id(self, account_id: str | None = None) -> str:
        self._account_id = account_id or "default"
        logger.info(f"[TwitchSetup] Resolved account ID: {self._account_id}")
        return self._account_id

    def prompt_username(self, username: str) -> bool:
        if not username or not username.strip():
            logger.warning("[TwitchSetup] Bot username cannot be empty")
            return False
        self._config["bot_username"] = username.strip().lower()
        self._mark_completed("username")
        logger.info(f"[TwitchSetup] Bot username: {self._config['bot_username']}")
        return True

    def prompt_token(self, access_token: str) -> bool:
        token = access_token.strip()
        if not token:
            import os

            env_token = os.environ.get("TWITCH_ACCESS_TOKEN", "") or os.environ.get("OPENCLAW_TWITCH_ACCESS_TOKEN", "")
            if env_token:
                self._config["access_token"] = env_token
                logger.info("[TwitchSetup] Using token from environment variable")
            else:
                logger.warning("[TwitchSetup] No access token provided and no env var found")
                return False
        else:
            from .token_utils import ensure_oauth_prefix

            self._config["access_token"] = ensure_oauth_prefix(token)
        self._mark_completed("token")
        logger.info("[TwitchSetup] Access token configured")
        return True

    def prompt_client_id(self, client_id: str) -> bool:
        if not client_id or not client_id.strip():
            logger.warning("[TwitchSetup] Client ID cannot be empty")
            return False
        self._config["client_id"] = client_id.strip()
        self._mark_completed("client_id")
        logger.info(f"[TwitchSetup] Client ID: {self._config['client_id']}")
        return True

    def prompt_client_secret(self, client_secret: str = "") -> bool:
        if client_secret and client_secret.strip():
            self._config["client_secret"] = client_secret.strip()
            logger.info("[TwitchSetup] Client secret configured")
        else:
            logger.info("[TwitchSetup] Client secret skipped (EventSub and token refresh disabled)")
        self._mark_completed("client_secret")
        return True

    def prompt_channels(self, channels_input: str | list[str]) -> bool:
        if isinstance(channels_input, str):
            channels = [c.strip().lower() for c in channels_input.split(",") if c.strip()]
        else:
            channels = channels_input

        if not channels:
            logger.warning("[TwitchSetup] At least one channel is required")
            return False

        self._config["channels"] = channels
        self._mark_completed("channels")
        logger.info(f"[TwitchSetup] Channels: {channels}")
        return True

    def prompt_refresh_token(self, refresh_token: str = "") -> bool:
        if refresh_token and refresh_token.strip():
            self._config["refresh_token"] = refresh_token.strip()
            logger.info("[TwitchSetup] Refresh token configured")
        else:
            logger.info("[TwitchSetup] Refresh token skipped (manual rotation only)")
        self._mark_completed("refresh_token")
        return True

    def prompt_dm_policy(self, policy: str = "pairing") -> bool:
        valid = {"open", "pairing"}
        policy = policy.strip().lower()
        if policy not in valid:
            logger.warning(f"[TwitchSetup] Invalid DM policy '{policy}', must be one of {valid}")
            return False
        self._config["dm_policy"] = policy
        self._mark_completed("dm_policy")
        logger.info(f"[TwitchSetup] DM policy: {policy}")
        return True

    def prompt_group_access(self, policy: str = "open") -> bool:
        valid = {"open", "allowlist", "disabled", "mention_only"}
        policy = policy.strip().lower()
        if policy not in valid:
            logger.warning(f"[TwitchSetup] Invalid group policy '{policy}', must be one of {valid}")
            return False
        self._config["group_policy"] = policy
        self._mark_completed("group_access")
        logger.info(f"[TwitchSetup] Group access policy: {policy}")
        return True

    def prompt_allowed_roles(self, roles_input: str | list[str] = "all") -> bool:
        if isinstance(roles_input, str):
            roles = [r.strip().lower() for r in roles_input.split(",") if r.strip()]
        else:
            roles = roles_input

        valid_roles = {"moderator", "owner", "vip", "subscriber", "all"}
        filtered = [r for r in roles if r in valid_roles]
        if not filtered:
            logger.warning("[TwitchSetup] No valid roles specified, defaulting to 'all'")
            filtered = ["all"]

        self._config["allowedRoles"] = filtered
        self._mark_completed("allowed_roles")
        logger.info(f"[TwitchSetup] Allowed roles: {filtered}")
        return True

    def prompt_silent(self, silent_input: str = "") -> bool:
        silent = silent_input.strip().lower() in ("yes", "true", "1", "y", "on")
        self._config["silent"] = silent
        self._mark_completed("silent")
        logger.info(f"[TwitchSetup] Silent mode (ACTION): {silent}")
        return True

    def prompt_probe_timeout(self, timeout_input: str | int = 10000) -> bool:
        if isinstance(timeout_input, str):
            timeout_input = timeout_input.strip()
            if not timeout_input:
                self._config["probe_timeout_ms"] = 10000
                self._mark_completed("probe_timeout")
                return True
            try:
                timeout = int(timeout_input)
            except ValueError:
                logger.warning(f"[TwitchSetup] Invalid probe timeout: {timeout_input}")
                return False
        else:
            timeout = timeout_input

        if timeout < 1000:
            logger.warning("[TwitchSetup] Probe timeout too small, minimum 1000ms")
            return False
        self._config["probe_timeout_ms"] = timeout
        self._mark_completed("probe_timeout")
        logger.info(f"[TwitchSetup] Probe timeout: {timeout}ms")
        return True

    def finalize(self) -> dict[str, Any]:
        if self._disabled:
            return {"enabled": False}
        validation = self._validate_config()
        return {
            "enabled": True,
            "account_id": self._account_id or "default",
            "config": dict(self._config),
            "validation": validation,
            "finalized_at": time.time(),
        }

    def finalize_and_write(self, storage_path: str | None = None) -> dict[str, Any]:
        result = self.finalize()
        if storage_path:
            try:
                config_path = Path(storage_path) / "twitch_config.json"
                config_path.parent.mkdir(parents=True, exist_ok=True)
                config_path.write_text(
                    json.dumps(result["config"], indent=2, ensure_ascii=False),
                    encoding="utf-8",
                )
                try:
                    os.chmod(config_path, stat.S_IRUSR | stat.S_IWUSR)
                except OSError:
                    logger.warning(f"[TwitchSetup] Failed to set file permissions for {config_path}")
                result["storage"] = {
                    "path": str(config_path),
                    "success": True,
                    "warning": "Config contains sensitive credentials. Ensure file permissions are restricted.",
                }
                logger.info(f"[TwitchSetup] Config written to {config_path} (permissions restricted)")
            except Exception as e:
                result["storage"] = {"path": str(storage_path), "success": False, "error": str(e)}
                logger.error(f"[TwitchSetup] Failed to write config: {e}")
        else:
            result["storage"] = {"mode": "memory", "success": True}
        return result

    def _validate_config(self) -> dict[str, Any]:
        errors: list[str] = []
        warnings: list[str] = []

        if not self._config.get("bot_username"):
            errors.append("bot_username is required")
        if not self._config.get("access_token"):
            errors.append("access_token is required")
        if not self._config.get("client_id"):
            errors.append("client_id is required")
        if not self._config.get("channels"):
            errors.append("at least one channel is required")

        group_policy = self._config.get("group_policy", "open")
        if group_policy not in {"open", "allowlist", "disabled", "mention_only"}:
            errors.append(f"invalid group_policy: {group_policy}")

        dm_policy = self._config.get("dm_policy", "pairing")
        if dm_policy not in {"open", "pairing"}:
            warnings.append(f"unknown dm_policy '{dm_policy}', defaulting to 'pairing'")

        if not self._config.get("client_secret"):
            warnings.append("no client_secret — EventSub and token refresh disabled")

        if not self._config.get("refresh_token"):
            warnings.append("no refresh_token — manual token rotation required")

        return {
            "valid": len(errors) == 0,
            "errors": errors,
            "warnings": warnings,
        }

    def disable(self) -> dict[str, Any]:
        self._disabled = True
        logger.info("[TwitchSetup] Account disabled")
        return {"enabled": False}

    def _mark_completed(self, step_id: str) -> None:
        for step in self._state.steps:
            if step.step_id == step_id:
                step.completed = True
                step.config_value = self._config.get(step.config_key)
                break

    @property
    def state(self) -> SetupWizardState:
        return self._state

    @property
    def config(self) -> dict[str, Any]:
        return dict(self._config)