"""
Compliance Extraction & Generation.

Functions for extracting checkpoints from legal text chunks,
generating controls, and creating remediation measures.
"""

import re
import hashlib
import logging
from typing import Dict, List, Optional

from compliance_models import Checkpoint, Control, Measure

logger = logging.getLogger(__name__)


def extract_checkpoints_from_chunk(chunk_text: str, payload: Dict) -> List[Checkpoint]:
    """
    Extract checkpoints/requirements from a chunk of text.

    Uses pattern matching to find requirement-like statements.
    """
    checkpoints = []
    regulation_code = payload.get("regulation_code", "UNKNOWN")
    regulation_name = payload.get("regulation_name", "Unknown")
    source_url = payload.get("source_url", "")
    chunk_id = hashlib.md5(chunk_text[:100].encode()).hexdigest()[:8]

    # Patterns for different requirement types
    patterns = [
        # BSI-TR patterns
        (r'([OT]\.[A-Za-z_]+\d*)[:\s]+(.+?)(?=\n[OT]\.|$)', 'bsi_requirement'),
        # Article patterns (GDPR, AI Act, etc.)
        (r'(?:Artikel|Art\.?)\s+(\d+)(?:\s+Abs(?:atz)?\.?\s*(\d+))?\s*[-\u2013:]\s*(.+?)(?=\n|$)', 'article'),
        # Numbered requirements
        (r'\((\d+)\)\s+(.+?)(?=\n\(\d+\)|$)', 'numbered'),
        # "Der Verantwortliche muss" patterns
        (r'(?:Der Verantwortliche|Die Aufsichtsbeh\u00f6rde|Der Auftragsverarbeiter)\s+(muss|hat|soll)\s+(.+?)(?=\.\s|$)', 'obligation'),
        # "Es ist erforderlich" patterns
        (r'(?:Es ist erforderlich|Es muss gew\u00e4hrleistet|Es sind geeignete)\s+(.+?)(?=\.\s|$)', 'requirement'),
    ]

    for pattern, pattern_type in patterns:
        matches = re.finditer(pattern, chunk_text, re.MULTILINE | re.DOTALL)
        for match in matches:
            if pattern_type == 'bsi_requirement':
                req_id = match.group(1)
                description = match.group(2).strip()
                title = req_id
            elif pattern_type == 'article':
                article_num = match.group(1)
                paragraph = match.group(2) or ""
                title_text = match.group(3).strip()
                req_id = f"{regulation_code}-Art{article_num}"
                if paragraph:
                    req_id += f"-{paragraph}"
                title = f"Art. {article_num}" + (f" Abs. {paragraph}" if paragraph else "")
                description = title_text
            elif pattern_type == 'numbered':
                num = match.group(1)
                description = match.group(2).strip()
                req_id = f"{regulation_code}-{num}"
                title = f"Anforderung {num}"
            else:
                # Generic requirement
                description = match.group(0).strip()
                req_id = f"{regulation_code}-{chunk_id}-{len(checkpoints)}"
                title = description[:50] + "..." if len(description) > 50 else description

            # Skip very short matches
            if len(description) < 20:
                continue

            checkpoint = Checkpoint(
                id=req_id,
                regulation_code=regulation_code,
                regulation_name=regulation_name,
                article=title if 'Art' in title else None,
                title=title,
                description=description[:500],
                original_text=description,
                chunk_id=chunk_id,
                source_url=source_url
            )
            checkpoints.append(checkpoint)

    return checkpoints


def generate_control_for_checkpoints(
    checkpoints: List[Checkpoint],
    domain_counts: Dict[str, int],
) -> Optional[Control]:
    """
    Generate a control that covers the given checkpoints.

    This is a simplified version - in production this would use the AI assistant.
    """
    if not checkpoints:
        return None

    # Group by regulation
    regulation = checkpoints[0].regulation_code

    # Determine domain based on content
    all_text = " ".join([cp.description for cp in checkpoints]).lower()

    domain = "gov"  # Default
    if any(kw in all_text for kw in ["verschl\u00fcssel", "krypto", "encrypt", "hash"]):
        domain = "crypto"
    elif any(kw in all_text for kw in ["zugang", "access", "authentif", "login", "benutzer"]):
        domain = "iam"
    elif any(kw in all_text for kw in ["datenschutz", "personenbezogen", "privacy", "einwilligung"]):
        domain = "priv"
    elif any(kw in all_text for kw in ["entwicklung", "test", "code", "software"]):
        domain = "sdlc"
    elif any(kw in all_text for kw in ["\u00fcberwach", "monitor", "log", "audit"]):
        domain = "aud"
    elif any(kw in all_text for kw in ["ki", "k\u00fcnstlich", "ai", "machine learning", "model"]):
        domain = "ai"
    elif any(kw in all_text for kw in ["betrieb", "operation", "verf\u00fcgbar", "backup"]):
        domain = "ops"
    elif any(kw in all_text for kw in ["cyber", "resilience", "sbom", "vulnerab"]):
        domain = "cra"

    # Generate control ID
    domain_count = domain_counts.get(domain, 0) + 1
    control_id = f"{domain.upper()}-{domain_count:03d}"

    # Create title from first checkpoint
    title = checkpoints[0].title
    if len(title) > 100:
        title = title[:97] + "..."

    # Create description
    description = f"Control f\u00fcr {regulation}: " + checkpoints[0].description[:200]

    # Pass criteria
    pass_criteria = f"Alle {len(checkpoints)} zugeh\u00f6rigen Anforderungen sind erf\u00fcllt und dokumentiert."

    # Implementation guidance
    guidance = f"Implementiere Ma\u00dfnahmen zur Erf\u00fcllung der Anforderungen aus {regulation}. "
    guidance += f"Dokumentiere die Umsetzung und f\u00fchre regelm\u00e4\u00dfige Reviews durch."

    # Determine if automated
    is_automated = any(kw in all_text for kw in ["automat", "tool", "scan", "test"])

    control = Control(
        id=control_id,
        domain=domain,
        title=title,
        description=description,
        checkpoints=[cp.id for cp in checkpoints],
        pass_criteria=pass_criteria,
        implementation_guidance=guidance,
        is_automated=is_automated,
        automation_tool="CI/CD Pipeline" if is_automated else None,
        priority="high" if "muss" in all_text or "erforderlich" in all_text else "medium"
    )

    return control


def generate_measure_for_control(control: Control) -> Measure:
    """Generate a remediation measure for a control."""
    measure_id = f"M-{control.id}"

    # Determine deadline based on priority
    deadline_days = {
        "critical": 30,
        "high": 60,
        "medium": 90,
        "low": 180
    }.get(control.priority, 90)

    # Determine responsible team
    responsible = {
        "priv": "Datenschutzbeauftragter",
        "iam": "IT-Security Team",
        "sdlc": "Entwicklungsteam",
        "crypto": "IT-Security Team",
        "ops": "Operations Team",
        "aud": "Compliance Team",
        "ai": "AI/ML Team",
        "cra": "IT-Security Team",
        "gov": "Management"
    }.get(control.domain, "Compliance Team")

    measure = Measure(
        id=measure_id,
        control_id=control.id,
        title=f"Umsetzung: {control.title[:50]}",
        description=f"Implementierung und Dokumentation von {control.id}: {control.description[:100]}",
        responsible=responsible,
        deadline_days=deadline_days,
        status="pending"
    )

    return measure