"""
Agent Analyze Routes — combined endpoint that fetches a URL, classifies it,
assesses DSGVO compliance, and sends a notification email.

POST /api/compliance/agent/analyze
"""

import logging
import re
import os
from datetime import datetime, timezone

import httpx
from fastapi import APIRouter
from pydantic import BaseModel

from compliance.services.smtp_sender import send_email

logger = logging.getLogger(__name__)

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

SDK_URL = os.environ.get("AI_SDK_URL", "http://bp-compliance-ai-sdk:8090")
TENANT_ID = "9282a473-5c95-4b3a-bf78-0ecc0ec71d3e"
USER_ID = "00000000-0000-0000-0000-000000000001"

ESCALATION_ROLES = {
    "E0": "Kein Handlungsbedarf",
    "E1": "Teamleitung Datenschutz",
    "E2": "Datenschutzbeauftragter (DSB)",
    "E3": "DSB + Rechtsabteilung",
}

SDK_HEADERS = {
    "Content-Type": "application/json",
    "X-Tenant-ID": TENANT_ID,
    "X-User-ID": USER_ID,
}


class AnalyzeRequest(BaseModel):
    url: str
    recipient: str = "dsb@breakpilot.local"


class AnalyzeResponse(BaseModel):
    url: str
    classification: str
    risk_level: str
    risk_score: float
    escalation_level: str
    responsible_role: str
    findings: list[str]
    required_controls: list[str]
    summary: str
    email_status: str
    analyzed_at: str


@router.post("/analyze", response_model=AnalyzeResponse)
async def analyze_url(req: AnalyzeRequest):
    """Fetch URL, classify, assess compliance, and notify responsible role."""
    async with httpx.AsyncClient(timeout=60.0) as client:
        # Step 1: Fetch and clean
        text = await _fetch_and_clean(client, req.url)

        # Step 2: Classify via SDK LLM
        classification = await _classify(client, text)

        # Step 3: Assess via UCCA
        assessment = await _assess(client, text, classification)

        # Step 4: Determine role
        esc_level = assessment.get("escalation_level", "E0")
        role = ESCALATION_ROLES.get(esc_level, ESCALATION_ROLES["E0"])

        # Step 5: Build summary
        findings = assessment.get("triggered_rules", [])
        controls = assessment.get("required_controls", [])
        summary = _build_summary(req.url, classification, assessment, role)

        # Step 6: Send notification
        email_result = send_email(
            recipient=req.recipient,
            subject=f"Compliance-Finding: {classification} — {req.url[:60]}",
            body_html=f"<div>{summary}</div>",
        )

    return AnalyzeResponse(
        url=req.url,
        classification=classification,
        risk_level=assessment.get("risk_level", "unknown"),
        risk_score=assessment.get("risk_score", 0),
        escalation_level=esc_level,
        responsible_role=role,
        findings=findings if isinstance(findings, list) else [str(findings)],
        required_controls=controls if isinstance(controls, list) else [str(controls)],
        summary=summary,
        email_status=email_result.get("status", "failed"),
        analyzed_at=datetime.now(timezone.utc).isoformat(),
    )


async def _fetch_and_clean(client: httpx.AsyncClient, url: str) -> str:
    """Fetch URL and strip HTML to plain text."""
    resp = await client.get(url, follow_redirects=True, headers={
        "User-Agent": "BreakPilot-Compliance-Agent/1.0",
    })
    html = resp.text
    # Strip script/style blocks, then all tags
    clean = re.sub(r"<(script|style)[^>]*>.*?</\1>", "", html, flags=re.DOTALL | re.IGNORECASE)
    clean = re.sub(r"<[^>]+>", " ", clean)
    clean = re.sub(r"&nbsp;", " ", clean)
    clean = re.sub(r"\s+", " ", clean).strip()
    return clean[:4000]


async def _classify(client: httpx.AsyncClient, text: str) -> str:
    """Classify document type via SDK LLM chat."""
    try:
        resp = await client.post(f"{SDK_URL}/sdk/v1/llm/chat", headers=SDK_HEADERS, json={
            "messages": [
                {"role": "system", "content": (
                    "Klassifiziere das Dokument in GENAU EINE Kategorie: "
                    "privacy_policy, cookie_banner, terms_of_service, imprint, dpa, other. "
                    "Antworte NUR mit dem Kategorienamen, nichts anderes."
                )},
                {"role": "user", "content": text[:2000]},
            ],
        })
        data = resp.json()
        raw = data.get("response", data.get("content", "other")).strip().lower()
        for cat in ["privacy_policy", "cookie_banner", "terms_of_service", "imprint", "dpa"]:
            if cat in raw:
                return cat
        return "other"
    except Exception as e:
        logger.warning("Classification failed: %s", e)
        return "other"


async def _assess(client: httpx.AsyncClient, text: str, classification: str) -> dict:
    """Run UCCA assessment via SDK."""
    try:
        resp = await client.post(f"{SDK_URL}/sdk/v1/ucca/assess", headers=SDK_HEADERS, json={
            "use_case_text": text[:3000],
            "domain": classification,
            "data_categories": ["personal_data", "tracking", "cookies", "third_party_sharing"],
        })
        return resp.json()
    except Exception as e:
        logger.warning("Assessment failed: %s", e)
        return {"risk_level": "unknown", "risk_score": 0, "escalation_level": "E0"}


def _build_summary(url: str, classification: str, assessment: dict, role: str) -> str:
    """Build a German manager summary."""
    risk = assessment.get("risk_level", "unbekannt")
    score = assessment.get("risk_score", 0)
    findings = assessment.get("triggered_rules", [])
    controls = assessment.get("required_controls", [])

    findings_text = "\n".join(f"- {f}" for f in findings[:5]) if findings else "Keine"
    controls_text = "\n".join(f"- {c}" for c in controls[:5]) if controls else "Keine"

    return (
        f"Dokumenttyp: {classification}\n"
        f"Quelle: {url}\n"
        f"Risikobewertung: {risk} ({score}/100)\n"
        f"Zustaendig: {role}\n\n"
        f"Findings:\n{findings_text}\n\n"
        f"Erforderliche Massnahmen:\n{controls_text}"
    )