from __future__ import annotations

import html
import itertools
from typing import Iterable

from .models import EvidenceItem

_counter = itertools.count(1)


def reset_evidence_counter() -> None:
    global _counter
    _counter = itertools.count(1)


def make_evidence(
    *,
    category: str,
    finding: str,
    source_name: str,
    source_url: str,
    source_type: str,
    resolution_or_scope: str,
    confidence: str,
    limitation: str,
    design_implication: str,
    verification_needed: str,
    output_label: str,
) -> EvidenceItem:
    if confidence not in {"high", "medium", "low"}:
        raise ValueError(f"Invalid confidence: {confidence}")
    if output_label not in {
        "computed",
        "public_data",
        "cad_derived",
        "user_input",
        "ai_interpretation",
        "site_visit_required",
        "professional_verification_required",
    }:
        raise ValueError(f"Invalid output label: {output_label}")
    return EvidenceItem(
        id=f"E{next(_counter):03d}",
        category=category,
        finding=finding,
        source_name=source_name,
        source_url=source_url,
        source_type=source_type,
        resolution_or_scope=resolution_or_scope,
        confidence=confidence,  # type: ignore[arg-type]
        limitation=limitation,
        design_implication=design_implication,
        verification_needed=verification_needed,
        output_label=output_label,  # type: ignore[arg-type]
    )


def evidence_to_markdown_table(items: Iterable[EvidenceItem]) -> str:
    rows = list(items)
    if not rows:
        return "_No evidence rows were generated._"
    header = (
        "| ID | Category | Finding | Source | Confidence | Limitation | "
        "Design implication | Verify on site |\n"
        "|---|---|---|---|---|---|---|---|"
    )
    body = []
    for item in rows:
        source = _md(item.source_name)
        if item.source_url:
            source = f"[{source}]({item.source_url})"
        body.append(
            "| {id} | {category} | {finding} | {source} | {confidence} | "
            "{limitation} | {implication} | {verify} |".format(
                id=_md(item.id),
                category=_md(item.category),
                finding=_md(item.finding),
                source=source,
                confidence=_md(item.confidence),
                limitation=_md(item.limitation),
                implication=_md(item.design_implication),
                verify=_md(item.verification_needed),
            )
        )
    return header + "\n" + "\n".join(body)


def evidence_to_dataframe_rows(items: Iterable[EvidenceItem]) -> list[dict[str, str]]:
    return [
        {
            "ID": item.id,
            "Category": item.category,
            "Finding": item.finding,
            "Source": item.source_name,
            "Source URL": item.source_url,
            "Type": item.source_type,
            "Scope / resolution": item.resolution_or_scope,
            "Confidence": item.confidence,
            "Limitation": item.limitation,
            "Design implication": item.design_implication,
            "Verify": item.verification_needed,
            "Label": item.output_label,
        }
        for item in items
    ]


def evidence_to_html_table(items: Iterable[EvidenceItem]) -> str:
    rows = list(items)
    if not rows:
        return "<div class='evidence-shell'><p>No evidence rows were generated.</p></div>"
    body = []
    for item in rows:
        source = html.escape(item.source_name or "Not available")
        if item.source_url:
            safe_url = html.escape(item.source_url, quote=True)
            source = f"<a href='{safe_url}' target='_blank' rel='noopener noreferrer'>{source}</a>"
        body.append(
            "<tr>"
            f"<td class='evidence-id'>{html.escape(item.id)}</td>"
            f"<td>{html.escape(item.category)}</td>"
            f"<td>{html.escape(item.finding)}</td>"
            f"<td>{source}<small>{html.escape(item.source_type)}</small></td>"
            f"<td><span class='confidence confidence-{html.escape(item.confidence)}'>{html.escape(item.confidence)}</span></td>"
            f"<td>{html.escape(item.resolution_or_scope)}</td>"
            f"<td>{html.escape(item.limitation)}</td>"
            f"<td>{html.escape(item.design_implication)}</td>"
            f"<td>{html.escape(item.verification_needed)}</td>"
            "</tr>"
        )
    return (
        "<div class='evidence-shell'>"
        "<div class='evidence-header'>"
        "<div><span>Evidence Audit</span><strong>Every board claim must trace to a source, calculation, or verification rule.</strong></div>"
        f"<b>{len(rows)} rows</b>"
        "</div>"
        "<div class='evidence-scroll'>"
        "<table class='evidence-html-table'>"
        "<thead><tr>"
        "<th>ID</th><th>Category</th><th>Finding</th><th>Source</th><th>Confidence</th>"
        "<th>Scope</th><th>Limitation</th><th>Design implication</th><th>Verify</th>"
        "</tr></thead>"
        "<tbody>"
        + "".join(body)
        + "</tbody></table></div></div>"
    )


def _md(text: object) -> str:
    escaped = html.escape("" if text is None else str(text))
    return escaped.replace("|", "\\|").replace("\n", " ")