from __future__ import annotations

import re
import unicodedata

from sqlalchemy.ext.asyncio import AsyncSession

from shared.contracts.dtos import MarketPlaceDTO
from shared.infrastructure.actions import call_action, ActionError
from services import blog_service


class MarketError(ValueError):
    """Base error for market service operations."""


def slugify(value: str, max_len: int = 255) -> str:
    if value is None:
        value = ""
    value = unicodedata.normalize("NFKD", value)
    value = value.encode("ascii", "ignore").decode("ascii")
    value = value.lower()
    value = value.replace("/", "-")
    value = re.sub(r"[^a-z0-9]+", "-", value)
    value = re.sub(r"-{2,}", "-", value)
    value = value.strip("-")[:max_len].strip("-")
    return value or "market"


async def create_market(sess: AsyncSession, post_id: int, name: str) -> MarketPlaceDTO:
    name = (name or "").strip()
    if not name:
        raise MarketError("Market name must not be empty.")
    slug = slugify(name)

    post = await blog_service.get_post_by_id(sess, post_id)
    if not post:
        raise MarketError(f"Post {post_id} does not exist.")

    if not post.is_page:
        raise MarketError("Markets can only be created on pages, not posts.")

    check = await call_action("relations", "can-relate", payload={
        "relation_type": "page->market", "from_id": post_id,
    })
    if not check.get("allowed"):
        raise MarketError(check.get("reason", "Cannot create market for this page."))

    try:
        result = await call_action("market", "create-marketplace", payload={
            "container_type": "page", "container_id": post_id,
            "name": name, "slug": slug,
        })
        return MarketPlaceDTO(**result)
    except ActionError as e:
        raise MarketError(str(e)) from e


async def soft_delete_market(sess: AsyncSession, post_slug: str, market_slug: str) -> bool:
    post = await blog_service.get_post_by_slug(sess, post_slug)
    if not post:
        return False

    try:
        result = await call_action("market", "soft-delete-marketplace", payload={
            "container_type": "page", "container_id": post.id, "slug": market_slug,
        })
        return result.get("deleted", False)
    except ActionError:
        return False