from __future__ import annotations

import hashlib
import hmac
import json
import logging
from typing import Any

logger = logging.getLogger(__name__)


def derive_interaction_secret(bot_token: str) -> str:
    return hmac.new(
        key=b"openclaw-mattermost-interactions",
        msg=bot_token.encode(),
        digestmod=hashlib.sha256,
    ).hexdigest()


def generate_interaction_token(context: dict, account_id: str | None = None) -> str:
    secret = derive_interaction_secret(_get_interaction_secret(account_id))
    canonical = canonicalize_interaction_context(context)
    payload = json.dumps(canonical, sort_keys=True)
    return hmac.new(
        key=secret.encode(),
        msg=payload.encode(),
        digestmod=hashlib.sha256,
    ).hexdigest()


def verify_interaction_token(context: dict, token: str, account_id: str | None = None) -> bool:
    expected = generate_interaction_token(context, account_id)
    return hmac.compare_digest(expected, token)


def canonicalize_interaction_context(value) -> object:
    if isinstance(value, list):
        return [canonicalize_interaction_context(v) for v in value]
    if isinstance(value, dict):
        return {
            k: canonicalize_interaction_context(v)
            for k, v in sorted(value.items())
            if v is not None
        }
    return value


def _get_interaction_secret(account_id: str | None) -> str:
    import os

    if account_id:
        key = f"MATTERMOST_INTERACTION_SECRET_{account_id.upper()}"
        return os.environ.get(key, "") or os.environ.get("MATTERMOST_BOT_TOKEN", "")
    return os.environ.get("MATTERMOST_BOT_TOKEN", "")


def sanitize_action_id(action_id: str) -> str:
    return action_id.replace("-", "").replace("_", "")


def build_button_props(
    callback_url: str,
    account_id: str | None,
    channel_id: str,
    buttons: list[dict],
    text: str | None = None,
) -> dict | None:
    flattened = _flatten_buttons(buttons)
    if not flattened:
        return None

    mattermost_buttons = []
    for btn in flattened:
        btn_id = btn.get("id") or btn.get("callback_data")
        btn_name = btn.get("text") or btn.get("name") or btn.get("label")
        if not btn_id or not btn_name:
            continue

        context = (btn.get("context") or {}).copy()
        context["__openclaw_channel_id"] = channel_id

        mattermost_buttons.append({
            "id": sanitize_action_id(btn_id),
            "name": btn_name,
            "type": "button",
            "style": btn.get("style", "default"),
            "integration": {
                "url": f"{callback_url}/{account_id}",
                "context": {
                    **context,
                    "_token": generate_interaction_token(context, account_id),
                },
            },
        })

    if not mattermost_buttons:
        return None

    return {
        "attachments": [{
            "text": text or "",
            "actions": mattermost_buttons,
        }],
    }


def _flatten_buttons(buttons: list[dict]) -> list[dict]:
    flattened: list[dict] = []
    for item in buttons:
        if isinstance(item, dict) and "buttons" in item:
            flattened.extend(item["buttons"])
        elif isinstance(item, list):
            flattened.extend(item)
        else:
            flattened.append(item)
    return flattened


async def handle_interaction_callback(
    body: dict, account_id: str, allowed_source_ips: list[str],
) -> dict:
    context = body.get("context", {})
    token = context.pop("_token", None)
    if not token:
        return {"status": "error", "reason": "missing_token"}

    if not verify_interaction_token(context, token, account_id):
        return {"status": "error", "reason": "invalid_token"}

    action_id = body.get("action_id", "")
    channel_id = context.get("__openclaw_channel_id", "")
    user_id = body.get("user_id", "")
    post_id = body.get("post_id", "")

    return {
        "status": "ok",
        "action_id": action_id,
        "channel_id": channel_id,
        "user_id": user_id,
        "post_id": post_id,
        "context": context,
    }


def build_dialog(
    trigger_id: str,
    url: str,
    title: str,
    *,
    introduction_text: str = "",
    elements: list[dict] | None = None,
    submit_label: str = "提交",
    notify_on_cancel: bool = False,
    callback_id: str = "openclaw_dialog",
) -> dict:
    return {
        "trigger_id": trigger_id,
        "url": url,
        "dialog": {
            "callback_id": callback_id,
            "title": title,
            "introduction_text": introduction_text,
            "elements": elements or [],
            "submit_label": submit_label,
            "notify_on_cancel": notify_on_cancel,
        },
    }


async def open_dialog(client, dialog_payload: dict) -> dict:
    return await client._request("POST", "/actions/dialogs/open", body=dialog_payload)


def build_select_element(
    name: str,
    label: str,
    options: list[dict[str, str]],
    *,
    optional: bool = False,
    default: str = "",
    help_text: str = "",
) -> dict:
    return {
        "display_name": label,
        "name": name,
        "type": "select",
        "options": [
            {"text": opt["text"], "value": opt["value"]}
            for opt in options
        ],
        "optional": optional,
        "default": default,
        "help_text": help_text,
    }


def build_text_element(
    name: str,
    label: str,
    *,
    subtype: str = "text",
    optional: bool = False,
    default: str = "",
    placeholder: str = "",
    help_text: str = "",
    min_length: int = 0,
    max_length: int = 0,
) -> dict:
    element: dict[str, Any] = {
        "display_name": label,
        "name": name,
        "type": "text",
        "subtype": subtype,
        "optional": optional,
        "default": default,
        "placeholder": placeholder,
        "help_text": help_text,
    }
    if min_length > 0:
        element["min_length"] = min_length
    if max_length > 0:
        element["max_length"] = max_length
    return element


def build_attachment(
    *,
    fallback: str = "",
    color: str = "",
    pretext: str = "",
    author_name: str = "",
    author_icon: str = "",
    author_link: str = "",
    title: str = "",
    title_link: str = "",
    text: str = "",
    fields: list[dict[str, Any]] | None = None,
    image_url: str = "",
    thumb_url: str = "",
    footer: str = "",
    footer_icon: str = "",
    actions: list[dict] | None = None,
) -> dict:
    attachment: dict[str, Any] = {}
    if fallback:
        attachment["fallback"] = fallback
    if color:
        attachment["color"] = color
    if pretext:
        attachment["pretext"] = pretext
    if author_name:
        attachment["author_name"] = author_name
        if author_icon:
            attachment["author_icon"] = author_icon
        if author_link:
            attachment["author_link"] = author_link
    if title:
        attachment["title"] = title
        if title_link:
            attachment["title_link"] = title_link
    if text:
        attachment["text"] = text
    if fields:
        attachment["fields"] = [
            {"title": f.get("title", ""), "value": f.get("value", ""), "short": f.get("short", True)}
            for f in fields
        ]
    if image_url:
        attachment["image_url"] = image_url
    if thumb_url:
        attachment["thumb_url"] = thumb_url
    if footer:
        attachment["footer"] = footer
        if footer_icon:
            attachment["footer_icon"] = footer_icon
    if actions:
        attachment["actions"] = actions
    return attachment