from __future__ import annotations

import re
from typing import Any

from .classify import SECTION_ORDER
from .models import NewsItem


def validate_report_markdown(markdown: str, items: list[NewsItem]) -> dict[str, Any]:
    return validate_markdown(markdown, items)


def validate_markdown(markdown: str, items: list[NewsItem]) -> dict[str, Any]:
    blocking_errors: list[str] = []
    auto_fixes: list[str] = []
    warnings: list[dict[str, str]] = []

    if not items:
        blocking_errors.append("no_items")
    if len((markdown or "").strip()) < 80:
        blocking_errors.append("markdown_too_short")
    if items and "## " not in markdown:
        blocking_errors.append("no_sections")
    if re.search(r"\{[^{}]*\}", markdown or ""):
        blocking_errors.append("json_fragment_detected")
    if "> >" in (markdown or ""):
        auto_fixes.append("double_blockquote_detected")
    if re.search(r"\[\d+\]|\[N\]", markdown or ""):
        auto_fixes.append("reference_marker_detected")

    for item in items:
        if not item.url:
            warnings.append({"type": "missing_url", "item_id": item.id})
        if item.section not in SECTION_ORDER:
            blocking_errors.append("invalid_section")
            break

    return {
        "item_count": len(items),
        "section_count": len({item.section for item in items if item.section}),
        "markdown_length": len(markdown or ""),
        "auto_fixes": auto_fixes,
        "warnings": warnings,
        "blocking_errors": blocking_errors,
    }