"""Auth-Router: Magic-Link-Login und Nutzerverwaltung."""
import logging
from datetime import datetime, timedelta
from fastapi import APIRouter, Depends, HTTPException, Request, status
from models import (
    MagicLinkRequest,
    MagicLinkResponse,
    VerifyTokenRequest,
    VerifyCodeRequest,
    TokenResponse,
    UserMeResponse,
)
from auth import (
    create_token,
    get_current_user,
    generate_magic_token,
    generate_magic_code,
)
from database import db_dependency
from config import TIMEZONE, MAGIC_LINK_EXPIRE_MINUTES, MAGIC_LINK_BASE_URL
from email_utils.sender import send_email
from email_utils.templates import magic_link_login_email
from email_utils.rate_limiter import magic_link_limiter, verify_code_limiter
import aiosqlite

logger = logging.getLogger("osint.auth")

router = APIRouter(prefix="/api/auth", tags=["auth"])


@router.post("/magic-link", response_model=MagicLinkResponse)
async def request_magic_link(
    data: MagicLinkRequest,
    request: Request,
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Magic Link anfordern. Sendet E-Mail mit Link + Code."""
    email = data.email.lower().strip()
    ip = request.client.host if request.client else "unknown"

    # Rate-Limit pruefen
    allowed, reason = magic_link_limiter.check(email, ip)
    if not allowed:
        logger.warning(f"Rate-Limit fuer {email} von {ip}: {reason}")
        # Trotzdem 200 zurueckgeben (kein Information-Leak)
        return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")

    # Nutzer suchen
    cursor = await db.execute(
        """SELECT u.id, u.email, u.username, u.role, u.organization_id, u.is_active,
                  o.is_active as org_active, o.slug as org_slug
           FROM users u
           JOIN organizations o ON o.id = u.organization_id
           WHERE LOWER(u.email) = ?""",
        (email,),
    )
    user = await cursor.fetchone()

    if not user:
        magic_link_limiter.record(email, ip)
        return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")

    if not user["is_active"]:
        magic_link_limiter.record(email, ip)
        return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")

    if not user["org_active"]:
        magic_link_limiter.record(email, ip)
        return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")

    # Lizenz pruefen
    from services.license_service import check_license
    lic = await check_license(db, user["organization_id"])
    if lic.get("status") == "org_disabled":
        magic_link_limiter.record(email, ip)
        return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")

    # Token + Code generieren
    token = generate_magic_token()
    code = generate_magic_code()
    expires_at = (datetime.now(TIMEZONE) + timedelta(minutes=MAGIC_LINK_EXPIRE_MINUTES)).strftime('%Y-%m-%d %H:%M:%S')

    # Alte ungenutzte Magic Links fuer diese E-Mail invalidieren
    await db.execute(
        "UPDATE magic_links SET is_used = 1 WHERE email = ? AND is_used = 0",
        (email,),
    )

    # Neuen Magic Link speichern
    await db.execute(
        """INSERT INTO magic_links (email, token, code, purpose, user_id, expires_at, ip_address)
           VALUES (?, ?, ?, 'login', ?, ?, ?)""",
        (email, token, code, user["id"], expires_at, ip),
    )
    await db.commit()

    # E-Mail senden
    link = f"{MAGIC_LINK_BASE_URL}/?token={token}"
    subject, html = magic_link_login_email(user["email"].split("@")[0], code, link)
    await send_email(email, subject, html)

    magic_link_limiter.record(email, ip)
    return MagicLinkResponse(message="Wenn ein Konto existiert, wurde eine E-Mail gesendet.")


@router.post("/verify", response_model=TokenResponse)
async def verify_magic_link(
    data: VerifyTokenRequest,
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Magic Link verifizieren (Token aus URL)."""
    cursor = await db.execute(
        """SELECT ml.*, u.username, u.email, u.role, u.organization_id, u.is_active,
                  o.slug as org_slug, o.is_active as org_active
           FROM magic_links ml
           JOIN users u ON u.id = ml.user_id
           JOIN organizations o ON o.id = u.organization_id
           WHERE ml.token = ? AND ml.is_used = 0""",
        (data.token,),
    )
    ml = await cursor.fetchone()

    if not ml:
        raise HTTPException(status_code=400, detail="Ungueltiger oder bereits verwendeter Link")

    # Ablauf pruefen
    now = datetime.now(TIMEZONE)
    expires = datetime.fromisoformat(ml["expires_at"])
    if expires.tzinfo is None:
        expires = expires.replace(tzinfo=TIMEZONE)
    if now > expires:
        raise HTTPException(status_code=400, detail="Link abgelaufen. Bitte neuen Link anfordern.")

    if not ml["is_active"] or not ml["org_active"]:
        raise HTTPException(status_code=403, detail="Konto oder Organisation deaktiviert")

    # Magic Link als verwendet markieren
    await db.execute("UPDATE magic_links SET is_used = 1 WHERE id = ?", (ml["id"],))

    # Letzten Login aktualisieren
    await db.execute(
        "UPDATE users SET last_login_at = ? WHERE id = ?",
        (now.isoformat(), ml["user_id"]),
    )
    await db.commit()

    # JWT erstellen
    token = create_token(
        user_id=ml["user_id"],
        username=ml["username"],
        email=ml["email"],
        role=ml["role"],
        tenant_id=ml["organization_id"],
        org_slug=ml["org_slug"],
    )

    return TokenResponse(
        access_token=token,
        username=ml["username"],
    )


@router.post("/verify-code", response_model=TokenResponse)
async def verify_magic_code(
    data: VerifyCodeRequest,
    request: Request,
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Magic Code verifizieren (6-stelliger Code + E-Mail)."""
    email = data.email.lower().strip()
    ip = request.client.host if request.client else "unknown"

    # Brute-Force-Schutz: Fehlversuche pruefen
    allowed, reason = verify_code_limiter.check(email, ip)
    if not allowed:
        logger.warning(f"Verify-Code Rate-Limit fuer {email} von {ip}: {reason}")
        # Bei Sperre alle offenen Magic Links fuer diese E-Mail invalidieren
        await db.execute(
            "UPDATE magic_links SET is_used = 1 WHERE email = ? AND is_used = 0",
            (email,),
        )
        await db.commit()
        raise HTTPException(status_code=429, detail=reason)

    cursor = await db.execute(
        """SELECT ml.*, u.username, u.email as user_email, u.role, u.organization_id, u.is_active,
                  o.slug as org_slug, o.is_active as org_active
           FROM magic_links ml
           JOIN users u ON u.id = ml.user_id
           JOIN organizations o ON o.id = u.organization_id
           WHERE LOWER(ml.email) = ? AND ml.code = ? AND ml.is_used = 0
           ORDER BY ml.created_at DESC LIMIT 1""",
        (email, data.code),
    )
    ml = await cursor.fetchone()

    if not ml:
        verify_code_limiter.record_failure(email, ip)
        logger.warning(f"Fehlgeschlagener Code-Versuch fuer {email} von {ip}")
        raise HTTPException(status_code=400, detail="Ungueltiger Code")

    # Ablauf pruefen
    now = datetime.now(TIMEZONE)
    expires = datetime.fromisoformat(ml["expires_at"])
    if expires.tzinfo is None:
        expires = expires.replace(tzinfo=TIMEZONE)
    if now > expires:
        raise HTTPException(status_code=400, detail="Code abgelaufen. Bitte neuen Code anfordern.")

    if not ml["is_active"] or not ml["org_active"]:
        raise HTTPException(status_code=403, detail="Konto oder Organisation deaktiviert")

    # Magic Link als verwendet markieren
    await db.execute("UPDATE magic_links SET is_used = 1 WHERE id = ?", (ml["id"],))

    # Letzten Login aktualisieren
    await db.execute(
        "UPDATE users SET last_login_at = ? WHERE id = ?",
        (now.isoformat(), ml["user_id"]),
    )
    await db.commit()

    # Fehlversuche-Zaehler nach Erfolg zuruecksetzen
    verify_code_limiter.clear(email)

    token = create_token(
        user_id=ml["user_id"],
        username=ml["username"],
        email=ml["user_email"],
        role=ml["role"],
        tenant_id=ml["organization_id"],
        org_slug=ml["org_slug"],
    )

    return TokenResponse(
        access_token=token,
        username=ml["username"],
    )


@router.get("/me", response_model=UserMeResponse)
async def get_me(
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Aktuellen Nutzer mit Org-Info abfragen."""
    # Org-Name laden
    org_name = ""
    if current_user.get("tenant_id"):
        cursor = await db.execute(
            "SELECT name FROM organizations WHERE id = ?",
            (current_user["tenant_id"],),
        )
        org = await cursor.fetchone()
        if org:
            org_name = org["name"]

    # Lizenzstatus laden
    license_info = {}
    if current_user.get("tenant_id"):
        from services.license_service import check_license
        license_info = await check_license(db, current_user["tenant_id"])

    # Credits-Daten laden
    credits_total = None
    credits_remaining = None
    credits_percent_used = None
    if current_user.get("tenant_id"):
        lic_cursor = await db.execute(
            "SELECT credits_total, credits_used, cost_per_credit FROM licenses WHERE organization_id = ? AND status = 'active' ORDER BY id DESC LIMIT 1",
            (current_user["tenant_id"],))
        lic_row = await lic_cursor.fetchone()
        if lic_row and lic_row["credits_total"]:
            credits_total = lic_row["credits_total"]
            credits_used = lic_row["credits_used"] or 0
            credits_remaining = max(0, int(credits_total - credits_used))
            credits_percent_used = round(min(100, (credits_used / credits_total) * 100), 1) if credits_total > 0 else 0

    return UserMeResponse(
        id=current_user["id"],
        username=current_user["username"],
        email=current_user.get("email", ""),
        credits_total=credits_total,
        credits_remaining=credits_remaining,
        credits_percent_used=credits_percent_used,
        role=current_user["role"],
        org_name=org_name,
        org_slug=current_user.get("org_slug", ""),
        tenant_id=current_user.get("tenant_id"),
        license_status=license_info.get("status", "unknown"),
        license_type=license_info.get("license_type", ""),
        read_only=license_info.get("read_only", False),
    )