"""
Agent Document Check Routes — Multi-URL document verification.

The user provides explicit URLs + document types. No crawling needed.
Each document is loaded, expanded (accordions/tabs), text extracted,
and checked against its type-specific legal checklist.

POST /api/compliance/agent/doc-check
"""

import asyncio
import logging
import os
import uuid as _uuid
from datetime import datetime, timezone

import httpx
from fastapi import APIRouter
from pydantic import BaseModel

from compliance.services.dsi_document_checker import (
    check_document_completeness, classify_document_type,
)
from compliance.services.smtp_sender import send_email

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/compliance/agent", tags=["agent"])

CONSENT_TESTER_URL = "http://bp-compliance-consent-tester:8094"


class DocCheckEntry(BaseModel):
    doc_type: str  # dse, agb, impressum, cookie, widerruf, other
    label: str
    url: str


class DocCheckRequest(BaseModel):
    entries: list[DocCheckEntry]
    recipient: str = "dsb@breakpilot.local"
    check_cookie_banner: bool = False


class CheckItem(BaseModel):
    id: str
    label: str
    passed: bool
    severity: str
    matched_text: str = ""
    level: int = 1
    parent: str | None = None
    skipped: bool = False


class DocCheckResult(BaseModel):
    label: str
    url: str
    doc_type: str
    word_count: int = 0
    completeness_pct: int = 0
    correctness_pct: int = 0
    checks: list[CheckItem] = []
    findings_count: int = 0
    error: str = ""


class DocCheckResponse(BaseModel):
    results: list[DocCheckResult]
    cookie_banner_result: dict | None = None
    total_documents: int
    total_findings: int
    email_status: str = ""
    checked_at: str


# In-memory job store for async processing
_doc_check_jobs: dict[str, dict] = {}


class DocCheckStartResponse(BaseModel):
    check_id: str
    status: str = "running"


class DocCheckStatusResponse(BaseModel):
    check_id: str
    status: str
    progress: str = ""
    result: DocCheckResponse | None = None
    error: str = ""


@router.post("/doc-check")
async def start_doc_check(req: DocCheckRequest):
    """Start async multi-URL document check."""
    check_id = str(_uuid.uuid4())[:8]
    _doc_check_jobs[check_id] = {"status": "running", "progress": "Pruefung gestartet...", "result": None, "error": ""}
    asyncio.create_task(_run_doc_check(check_id, req))
    return DocCheckStartResponse(check_id=check_id, status="running")


@router.get("/doc-check/{check_id}")
async def get_doc_check_status(check_id: str):
    """Poll document check status."""
    job = _doc_check_jobs.get(check_id)
    if not job:
        return {"check_id": check_id, "status": "not_found"}
    return DocCheckStatusResponse(
        check_id=check_id, status=job["status"],
        progress=job.get("progress", ""), result=job.get("result"),
        error=job.get("error", ""),
    )


async def _run_doc_check(check_id: str, req: DocCheckRequest):
    """Background task: check each document."""
    try:
        results: list[DocCheckResult] = []
        total_findings = 0

        for i, entry in enumerate(req.entries):
            _doc_check_jobs[check_id]["progress"] = (
                f"Dokument {i+1}/{len(req.entries)}: {entry.label}..."
            )

            doc_results = await _check_single_document(entry)
            results.extend(doc_results)
            total_findings += sum(r.findings_count for r in doc_results)

        # Optional: Cookie banner check on first URL
        cookie_result = None
        if req.check_cookie_banner and req.entries:
            _doc_check_jobs[check_id]["progress"] = "Cookie-Banner wird geprueft..."
            cookie_result = await _check_cookie_banner(req.entries[0].url)

        # Build email report
        _doc_check_jobs[check_id]["progress"] = "Report wird erstellt..."
        summary = _build_report(results, cookie_result)
        email_result = send_email(
            recipient=req.recipient,
            subject=f"[DOKUMENTEN-PRUEFUNG] {len(results)} Dokumente geprueft",
            body_html=f"<pre>{summary}</pre>",
        )

        response = DocCheckResponse(
            results=results,
            cookie_banner_result=cookie_result,
            total_documents=len(results),
            total_findings=total_findings,
            email_status=email_result.get("status", "failed"),
            checked_at=datetime.now(timezone.utc).isoformat(),
        )

        _doc_check_jobs[check_id]["status"] = "completed"
        _doc_check_jobs[check_id]["result"] = response
        _doc_check_jobs[check_id]["progress"] = "Fertig"

    except Exception as e:
        logger.error("Doc check %s failed: %s", check_id, e)
        _doc_check_jobs[check_id]["status"] = "failed"
        _doc_check_jobs[check_id]["error"] = str(e)[:500]


async def _check_single_document(entry: DocCheckEntry) -> list[DocCheckResult]:
    """Load a single URL, expand content, extract text, split into sections,
    and check each section against its type-specific checklist.

    Returns multiple results if the page contains sub-documents
    (e.g. Cookies section, Social Media section on a DSI page).
    """
    try:
        async with httpx.AsyncClient(timeout=90.0) as client:
            resp = await client.post(
                f"{CONSENT_TESTER_URL}/dsi-discovery",
                json={"url": entry.url, "max_documents": 1},
            )
            if resp.status_code != 200:
                return [DocCheckResult(
                    label=entry.label, url=entry.url, doc_type=entry.doc_type,
                    error=f"Seite nicht erreichbar (HTTP {resp.status_code})",
                )]

            data = resp.json()
            docs = data.get("documents", [])

            doc_text = ""
            word_count = 0
            if docs:
                doc_text = docs[0].get("full_text", "") or docs[0].get("text_preview", "")
                word_count = docs[0].get("word_count", 0)

            if not doc_text or len(doc_text) < 50:
                return [DocCheckResult(
                    label=entry.label, url=entry.url, doc_type=entry.doc_type,
                    error="Kein Text extrahierbar",
                )]

            # Split text into sections and check each
            sections = _split_into_sections(doc_text, entry.label, entry.url)
            all_results: list[DocCheckResult] = []

            # Main document check (full text against primary type)
            main_result = _run_checklist(doc_text, entry.doc_type, entry.label, entry.url, word_count)

            # Control Library deep check — DISABLED until doc-check-specific
            # Master Controls with binary pass/fail criteria are available.
            # See: zeroclaw/INSTRUCTION-master-controls-for-doc-check.md
            # Code: compliance/services/rag_document_checker.py (ready to re-enable)

            all_results.append(main_result)

            # Sub-section checks (auto-detected from headings)
            for section in sections:
                if section["word_count"] < 100:
                    continue
                sub_result = _run_checklist(
                    section["text"], section["doc_type"],
                    section["title"], entry.url,
                    section["word_count"],
                )
                all_results.append(sub_result)

            return all_results

    except Exception as e:
        logger.warning("Doc check failed for %s: %s", entry.url, e)
        return [DocCheckResult(
            label=entry.label, url=entry.url, doc_type=entry.doc_type,
            error=str(e)[:200],
        )]


def _run_checklist(text: str, doc_type: str, label: str, url: str, word_count: int = 0) -> DocCheckResult:
    """Run checklist against text and return structured result."""
    findings = check_document_completeness(text, doc_type, label, url)

    all_checks: list[CheckItem] = []
    completeness = 0
    correctness = 0
    for f in findings:
        if "SCORE" in f.get("code", ""):
            for c in f.get("all_checks", []):
                all_checks.append(CheckItem(
                    id=c["id"], label=c["label"], passed=c["passed"],
                    severity=c["severity"], matched_text=c.get("matched_text", ""),
                    level=c.get("level", 1),
                    parent=c.get("parent"),
                    skipped=c.get("skipped", False),
                ))
            completeness = f.get("completeness_pct", 0)
            correctness = f.get("correctness_pct", 0)

    non_score = [f for f in findings if "SCORE" not in f.get("code", "")]
    return DocCheckResult(
        label=label, url=url, doc_type=doc_type,
        word_count=word_count or len(text.split()),
        completeness_pct=completeness,
        correctness_pct=correctness,
        checks=all_checks, findings_count=len(non_score),
    )


# Section heading patterns → document type mapping
# ONLY sections that are genuinely separate document types with their own checklists.
# Everything else (Social Media, Betroffenenrechte, Dienste von Drittanbietern)
# is part of the parent DSI and inherits its checks.
SECTION_TYPE_MAP = [
    (r"^cookie", "cookie"),
    (r"widerrufsrecht|widerrufsbelehrung", "widerruf"),
    (r"^impressum$", "impressum"),
    (r"^(?:agb|allgemeine geschäftsbedingungen|nutzungsbedingungen)$", "agb"),
    # DSFA MUST be checked BEFORE social_media (both can contain "Social Media")
    (r"datenschutzfolge|dsfa|risikoanalyse", "dsfa"),
    (r"^social\s*media$", "social_media"),  # Standalone heading "Social Media" = DSE
    (r"datenschutzerkl(?:ae|ä)rung.*social|datenschutz\s+f(?:ue|ü)r\s+social", "social_media"),
]


def _split_into_sections(text: str, parent_label: str, url: str) -> list[dict]:
    """Split document text at major headings into sub-sections.

    Detects sections like 'Cookies', 'Social Media', 'Dienste von Drittanbietern'
    and classifies each by document type for separate checking.
    """
    import re as _re
    sections = []

    # Split by lines that look like headings (short, followed by longer content)
    lines = text.split("\n")
    current_heading = ""
    current_text = []

    for line in lines:
        stripped = line.strip()
        # Detect heading: short line (< 80 chars), not empty, followed by content
        is_heading = (
            5 < len(stripped) < 80
            and not stripped.endswith(".")
            and not stripped.endswith(",")
            and stripped[0].isupper()
        )

        if is_heading and current_heading and len("\n".join(current_text)) > 200:
            # Save previous section
            sec_text = "\n".join(current_text)
            sec_type = _classify_section(current_heading)
            if sec_type and sec_type != "skip":
                sections.append({
                    "title": f"{parent_label} > {current_heading}",
                    "text": sec_text,
                    "doc_type": sec_type,
                    "word_count": len(sec_text.split()),
                })

        if is_heading:
            current_heading = stripped
            current_text = []
        else:
            current_text.append(line)

    # Last section
    if current_heading and len("\n".join(current_text)) > 200:
        sec_text = "\n".join(current_text)
        sec_type = _classify_section(current_heading)
        if sec_type and sec_type != "skip":
            sections.append({
                "title": f"{parent_label} > {current_heading}",
                "text": sec_text,
                "doc_type": sec_type,
                "word_count": len(sec_text.split()),
            })

    return sections


# Headings to skip — sub-sections of other documents, not standalone
SKIP_HEADINGS = {
    "nutzungskonzept social media",  # Internal concept, no legal checklist
    "risikoabwägung und datenschutzfolgenabschätzung",  # Sub-section of DSFA
    "risikoabwaegung und datenschutzfolgenabschaetzung",
}


def _classify_section(heading: str) -> str | None:
    """Classify a section heading into a document type."""
    import re as _re
    heading_lower = heading.lower().strip()
    # Skip known sub-sections
    if heading_lower in SKIP_HEADINGS:
        return None
    for pattern, doc_type in SECTION_TYPE_MAP:
        if _re.search(pattern, heading_lower):
            return doc_type
    return None


async def _check_cookie_banner(url: str) -> dict | None:
    """Run cookie banner consent test on a URL."""
    try:
        async with httpx.AsyncClient(timeout=120.0) as client:
            resp = await client.post(
                f"{CONSENT_TESTER_URL}/scan",
                json={"url": url, "timeout_per_phase": 8},
            )
            if resp.status_code == 200:
                return resp.json()
    except Exception as e:
        logger.warning("Cookie banner check failed: %s", e)
    return None


def _build_report(results: list[DocCheckResult], cookie_result: dict | None) -> str:
    """Build email report."""
    parts = [
        "DOKUMENTEN-PRUEFUNG",
        f"Dokumente geprueft: {len(results)}",
        "",
    ]
    for r in results:
        status = "OK" if r.completeness_pct == 100 else "LUECKENHAFT" if r.completeness_pct >= 50 else "MANGELHAFT"
        if r.error:
            status = "FEHLER"
        detail = f", Korrektheit {r.correctness_pct}%" if r.correctness_pct else ""
        parts.append(f"[{status}] {r.label} ({r.completeness_pct}%{detail}, {r.word_count} Woerter)")

        for check in r.checks:
            if check.skipped:
                continue
            icon = "+" if check.passed else "!!"
            indent = "    " if check.level == 2 else "  "
            parts.append(f"{indent}[{icon}] {check.label}")

        if r.error:
            parts.append(f"  FEHLER: {r.error}")
        parts.append("")

    if cookie_result:
        parts.extend([
            "Cookie-Banner Pruefung:",
            f"  Banner erkannt: {cookie_result.get('banner_detected', False)}",
            f"  Anbieter: {cookie_result.get('banner_provider', 'unbekannt')}",
        ])
        violations = cookie_result.get("banner_checks", {}).get("violations", [])
        if violations:
            for v in violations[:10]:
                parts.append(f"  [!!] {v.get('text', '')[:80]}")
        else:
            parts.append("  Keine Verstoesse erkannt.")

    return "\n".join(parts)