from __future__ import annotations

import logging
from typing import Any

logger = logging.getLogger(__name__)

WIZARD_STEPS = [
    {
        "step": 0,
        "title": "Bot Installation Guide",
        "description": (
            "Before configuring the adapter, install a Talk bot on your Nextcloud server.\n\n"
            "Run this command as an administrator on your Nextcloud server:\n\n"
            "```bash\n"
            "occ talk:bot:install <bot_name> <bot_secret> <bot_url>\n"
            "```\n\n"
            "Example:\n```bash\n"
            'occ talk:bot:install "ForcePilot Bot" my_secret_key https://your-server.example.com\n'
            "```\n\n"
            "After installation, use the bot username and the secret as app_password in Step 2."
        ),
        "field": None,
        "required": False,
    },
    {
        "step": 1,
        "title": "Nextcloud Instance URL",
        "description": "Enter the base URL of your Nextcloud server (e.g., https://cloud.example.com).",
        "field": "server_url",
        "required": True,
    },
    {
        "step": 2,
        "title": "Bot Credentials",
        "description": (
            "Enter the bot username and application password. "
            "Create an app password in Nextcloud at Settings > Security.\n\n"
            "Environment variables (alternative to config):\n"
            "- `NEXTCLOUD_TALK_BOT_USER` for bot_user\n"
            "- `NEXTCLOUD_TALK_APP_PASSWORD` or `NEXTCLOUD_TALK_API_PASSWORD` for app_password"
        ),
        "fields": ["bot_user", "app_password"],
        "required": True,
        "preferredEnvVar": {
            "app_password": "NEXTCLOUD_TALK_API_PASSWORD",
        },
    },
    {
        "step": 3,
        "title": "API Credentials (Optional)",
        "description": "Optionally provide separate API credentials for room/peer queries. Leave blank to reuse bot credentials.",
        "fields": ["api_user", "api_password"],
        "required": False,
    },
    {
        "step": 4,
        "title": "DM Policy",
        "description": "Choose how the bot handles direct messages: open (anyone), pairing (require admin approval), allowlist (specified users only), or disabled.",
        "field": "dm_policy",
        "required": True,
        "options": [
            {"value": "open", "label": "Open - anyone can message the bot"},
            {"value": "pairing", "label": "Pairing - users must be approved by admin"},
            {"value": "allowlist", "label": "Allowlist - only specified users"},
            {"value": "disabled", "label": "Disabled - no DMs allowed"},
        ],
    },
    {
        "step": 5,
        "title": "Allow From",
        "description": "Configure allowed user IDs and room tokens. Format: nc:{user_id} for users.",
        "field": "allow_from",
        "required": False,
    },
]


def generate_wizard_steps() -> list[dict[str, Any]]:
    return WIZARD_STEPS


def validate_step(step_num: int, data: dict[str, Any]) -> dict[str, Any]:
    step = next((s for s in WIZARD_STEPS if s["step"] == step_num), None)
    if not step:
        return {"valid": False, "error": f"Unknown step: {step_num}"}

    errors: list[str] = []

    if step_num == 1:
        server_url = data.get("server_url", "").strip()
        if step["required"] and not server_url:
            errors.append("Server URL is required")
        elif server_url and not (server_url.startswith("https://") or server_url.startswith("http://")):
            errors.append("Server URL must start with https:// or http://")

    elif step_num == 2:
        bot_user = data.get("bot_user", "").strip()
        app_password = data.get("app_password", "").strip()
        if not bot_user:
            errors.append("Bot username is required")
        if not app_password:
            errors.append("App password is required")

    elif step_num == 3:
        pass

    elif step_num == 4:
        dm_policy = data.get("dm_policy", "").strip()
        valid_policies = {"open", "pairing", "allowlist", "disabled"}
        if dm_policy and dm_policy not in valid_policies:
            errors.append(f"DM policy must be one of: {', '.join(sorted(valid_policies))}")

    elif step_num == 5:
        allow_from = data.get("allow_from", [])
        if isinstance(allow_from, list):
            for entry in allow_from:
                if not isinstance(entry, str) or not entry.startswith("nc:"):
                    errors.append(f"Each allow_from entry must start with 'nc:', got: {entry}")

    if errors:
        return {"valid": False, "errors": errors}
    return {"valid": True}


def build_config_from_wizard(wizard_data: dict[str, Any]) -> dict[str, Any]:
    config: dict[str, Any] = {
        "server_url": wizard_data.get("server_url", "").rstrip("/"),
        "bot_user": wizard_data.get("bot_user", ""),
        "app_password": wizard_data.get("app_password", ""),
        "dm_policy": wizard_data.get("dm_policy", "pairing"),
        "try_websocket": True,
    }

    api_user = wizard_data.get("api_user", "")
    if api_user:
        config["api_user"] = api_user
    api_password = wizard_data.get("api_password", "")
    if api_password:
        config["api_password"] = api_password

    allow_from = wizard_data.get("allow_from", [])
    if allow_from:
        config["allow_from"] = allow_from

    return config