"""Sources-Router: Quellenverwaltung (Multi-Tenant)."""
import logging
from collections import defaultdict
from fastapi import APIRouter, Depends, HTTPException, status
from models import SourceCreate, SourceUpdate, SourceResponse, DiscoverRequest, DiscoverResponse, DiscoverMultiResponse, DomainActionRequest
from auth import get_current_user
from database import db_dependency, refresh_source_counts
from source_rules import discover_source, discover_all_feeds, evaluate_feeds_with_claude, _extract_domain, _detect_category, domain_to_display_name, _DOMAIN_ALIASES
import aiosqlite

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

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

SOURCE_UPDATE_COLUMNS = {"name", "url", "domain", "source_type", "category", "status", "notes"}


def _check_source_ownership(source: dict, username: str):
    """Prueft ob der Nutzer die Quelle bearbeiten/loeschen darf.

    System-Quellen (auto-entdeckt) duerfen von jedem bearbeitet werden.
    Nutzer-Quellen nur vom Ersteller.
    """
    added_by = source.get("added_by", "")
    if added_by and added_by != "system" and added_by != username:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Nur der Ersteller kann diese Quelle bearbeiten",
        )


@router.get("", response_model=list[SourceResponse])
async def list_sources(
    source_type: str = None,
    category: str = None,
    source_status: str = None,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Alle Quellen auflisten (global + org-spezifisch)."""
    tenant_id = current_user.get("tenant_id")

    # Global (tenant_id=NULL) + eigene Org
    query = "SELECT * FROM sources WHERE (tenant_id IS NULL OR tenant_id = ?)"
    params = [tenant_id]

    if source_type:
        query += " AND source_type = ?"
        params.append(source_type)
    if category:
        query += " AND category = ?"
        params.append(category)
    if source_status:
        query += " AND status = ?"
        params.append(source_status)

    query += " ORDER BY source_type, category, name"
    cursor = await db.execute(query, params)
    rows = await cursor.fetchall()
    results = []
    for row in rows:
        d = dict(row)
        d["is_global"] = d.get("tenant_id") is None
        results.append(d)
    return results


@router.get("/stats")
async def get_source_stats(
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Aggregierte Quellen-Statistiken (global + eigene Org)."""
    tenant_id = current_user.get("tenant_id")

    cursor = await db.execute("""
        SELECT
            source_type,
            COUNT(*) as count,
            SUM(article_count) as total_articles
        FROM sources
        WHERE status = 'active' AND (tenant_id IS NULL OR tenant_id = ?)
        GROUP BY source_type
    """, (tenant_id,))
    rows = await cursor.fetchall()

    stats = {
        "rss_feed": {"count": 0, "articles": 0},
        "web_source": {"count": 0, "articles": 0},
        "telegram_channel": {"count": 0, "articles": 0},
        "excluded": {"count": 0, "articles": 0},
    }
    for row in rows:
        st = row["source_type"]
        if st in stats:
            stats[st]["count"] = row["count"]
            stats[st]["articles"] = row["total_articles"] or 0

    cursor = await db.execute(
        "SELECT COUNT(*) as cnt FROM articles WHERE tenant_id = ?",
        (tenant_id,),
    )
    total_row = await cursor.fetchone()

    return {
        "by_type": stats,
        "total_sources": sum(s["count"] for s in stats.values()),
        "total_articles": total_row["cnt"],
    }


@router.post("/discover", response_model=DiscoverResponse)
async def discover_source_endpoint(
    data: DiscoverRequest,
    current_user: dict = Depends(get_current_user),
):
    """RSS-Feed, Name, Kategorie und Domain einer URL automatisch erkennen."""
    try:
        result = await discover_source(data.url)
        return result
    except Exception as e:
        logger.error(f"Discovery fehlgeschlagen: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail="Discovery fehlgeschlagen")


@router.post("/discover-multi", response_model=DiscoverMultiResponse)
async def discover_multi_endpoint(
    data: DiscoverRequest,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Findet ALLE RSS-Feeds einer Domain, bewertet sie mit Claude und legt relevante als Quellen an."""
    tenant_id = current_user.get("tenant_id")
    try:
        multi = await discover_all_feeds(data.url)
        domain = multi["domain"]
        category = multi["category"]

        if not multi["feeds"]:
            single = await discover_source(data.url)
            sources = []
            if single.get("rss_url"):
                cursor = await db.execute(
                    "SELECT id FROM sources WHERE url = ?", (single["rss_url"],)
                )
                existing = await cursor.fetchone()
                if not existing:
                    cursor = await db.execute(
                        """INSERT INTO sources (name, url, domain, source_type, category, status, added_by, tenant_id)
                           VALUES (?, ?, ?, ?, ?, 'active', ?, ?)""",
                        (single["name"], single["rss_url"], single["domain"],
                         single["source_type"], single["category"], current_user["username"], tenant_id),
                    )
                    await db.commit()
                    cursor = await db.execute("SELECT * FROM sources WHERE id = ?", (cursor.lastrowid,))
                    row = await cursor.fetchone()
                    sources.append(dict(row))

            return DiscoverMultiResponse(
                domain=single.get("domain", domain),
                category=single.get("category", category),
                added_count=len(sources),
                skipped_count=1 if not sources and single.get("rss_url") else 0,
                total_found=1 if single.get("rss_url") else 0,
                sources=sources,
                fallback_single=True,
            )

        relevant_feeds = await evaluate_feeds_with_claude(domain, multi["feeds"])

        cursor = await db.execute("SELECT url FROM sources WHERE url IS NOT NULL")
        existing_urls = {row["url"] for row in await cursor.fetchall()}

        new_ids = []
        skipped = 0
        for feed in relevant_feeds:
            if feed["url"] in existing_urls:
                skipped += 1
                continue

            cursor = await db.execute(
                """INSERT INTO sources (name, url, domain, source_type, category, status, added_by, tenant_id)
                   VALUES (?, ?, ?, 'rss_feed', ?, 'active', ?, ?)""",
                (feed["name"], feed["url"], domain, category, current_user["username"], tenant_id),
            )
            new_ids.append(cursor.lastrowid)
            existing_urls.add(feed["url"])

        cursor = await db.execute(
            "SELECT id FROM sources WHERE LOWER(domain) = ? AND source_type = 'web_source'",
            (domain.lower(),),
        )
        if not await cursor.fetchone():
            cursor = await db.execute(
                """INSERT INTO sources (name, url, domain, source_type, category, status, added_by, tenant_id)
                   VALUES (?, ?, ?, 'web_source', ?, 'active', ?, ?)""",
                (domain_to_display_name(domain), f"https://{domain}", domain, category, current_user["username"], tenant_id),
            )
            new_ids.append(cursor.lastrowid)

        await db.commit()

        added_sources = []
        if new_ids:
            placeholders = ",".join("?" for _ in new_ids)
            cursor = await db.execute(
                f"SELECT * FROM sources WHERE id IN ({placeholders}) ORDER BY id",
                new_ids,
            )
            added_sources = [dict(row) for row in await cursor.fetchall()]

        return DiscoverMultiResponse(
            domain=domain,
            category=category,
            added_count=len(added_sources),
            skipped_count=skipped,
            total_found=len(multi["feeds"]),
            sources=added_sources,
            fallback_single=False,
        )

    except Exception as e:
        logger.error(f"Multi-Discovery fehlgeschlagen: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail="Multi-Discovery fehlgeschlagen")


@router.post("/rediscover-existing")
async def rediscover_existing_endpoint(
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Einmalige Migration: Bestehende RSS-Quellen nach zusaetzlichen Feeds durchsuchen."""
    tenant_id = current_user.get("tenant_id")
    try:
        cursor = await db.execute(
            "SELECT * FROM sources WHERE source_type = 'rss_feed' AND status = 'active' AND (tenant_id IS NULL OR tenant_id = ?)",
            (tenant_id,),
        )
        existing_sources = [dict(row) for row in await cursor.fetchall()]

        domains = defaultdict(list)
        for src in existing_sources:
            if src["domain"]:
                domains[src["domain"]].append(src)

        cursor = await db.execute("SELECT url FROM sources WHERE url IS NOT NULL")
        existing_urls = {row["url"] for row in await cursor.fetchall()}

        domains_processed = 0
        feeds_added = 0
        feeds_skipped = 0

        for domain, sources in domains.items():
            domains_processed += 1
            base_url = f"https://{domain}"

            try:
                multi = await discover_all_feeds(base_url)
                if not multi["feeds"]:
                    continue

                relevant_feeds = await evaluate_feeds_with_claude(domain, multi["feeds"])
                category = _detect_category(domain)

                for feed in relevant_feeds:
                    if feed["url"] in existing_urls:
                        feeds_skipped += 1
                        continue

                    await db.execute(
                        """INSERT INTO sources (name, url, domain, source_type, category, status, added_by, tenant_id)
                           VALUES (?, ?, ?, 'rss_feed', ?, 'active', ?, ?)""",
                        (feed["name"], feed["url"], domain, category, current_user["username"], tenant_id),
                    )
                    existing_urls.add(feed["url"])
                    feeds_added += 1

                await db.commit()
            except Exception as e:
                logger.warning(f"Rediscovery fuer {domain} fehlgeschlagen: {e}")
                continue

        return {
            "domains_processed": domains_processed,
            "feeds_added": feeds_added,
            "feeds_skipped": feeds_skipped,
        }

    except Exception as e:
        logger.error(f"Rediscovery fehlgeschlagen: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail="Rediscovery fehlgeschlagen")


@router.get("/my-exclusions")
async def get_my_exclusions(
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Gibt die vom aktuellen User ausgeschlossenen Domains zurück."""
    user_id = current_user["id"]
    cursor = await db.execute(
        "SELECT domain, notes, created_at FROM user_excluded_domains WHERE user_id = ? ORDER BY domain",
        (user_id,),
    )
    rows = await cursor.fetchall()
    return [dict(row) for row in rows]


@router.post("/block-domain")
async def block_domain(
    data: DomainActionRequest,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Domain fuer den aktuellen User ausschließen (per-User, nicht org-weit)."""
    user_id = current_user["id"]
    domain = data.domain.lower().strip()

    # Pruefen ob bereits ausgeschlossen
    cursor = await db.execute(
        "SELECT id FROM user_excluded_domains WHERE user_id = ? AND domain = ?",
        (user_id, domain),
    )
    existing = await cursor.fetchone()

    if existing:
        if data.notes:
            await db.execute(
                "UPDATE user_excluded_domains SET notes = ? WHERE id = ?",
                (data.notes, existing["id"]),
            )
            await db.commit()
        return {"domain": domain, "status": "already_excluded"}

    await db.execute(
        "INSERT INTO user_excluded_domains (user_id, domain, notes) VALUES (?, ?, ?)",
        (user_id, domain, data.notes),
    )
    await db.commit()

    return {"domain": domain, "status": "excluded"}


@router.post("/unblock-domain")
async def unblock_domain(
    data: DomainActionRequest,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Domain-Ausschluss fuer den aktuellen User aufheben."""
    user_id = current_user["id"]
    domain = data.domain.lower().strip()

    cursor = await db.execute(
        "DELETE FROM user_excluded_domains WHERE user_id = ? AND domain = ?",
        (user_id, domain),
    )
    removed = cursor.rowcount
    await db.commit()

    return {"domain": domain, "removed": removed > 0}


@router.delete("/domain/{domain}")
async def delete_domain(
    domain: str,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Alle Quellen einer Domain loeschen (nur org-eigene, nicht globale)."""
    tenant_id = current_user.get("tenant_id")
    domain_lower = domain.lower().strip()

    cursor = await db.execute(
        "SELECT * FROM sources WHERE LOWER(domain) = ? AND tenant_id = ?",
        (domain_lower, tenant_id),
    )
    rows = await cursor.fetchall()

    if not rows:
        raise HTTPException(status_code=404, detail="Keine Quellen fuer diese Domain gefunden")

    username = current_user["username"]
    for row in rows:
        source = dict(row)
        if source["added_by"] == "system":
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail="Domain enthaelt System-Quellen, die nicht geloescht werden koennen",
            )
        if source["added_by"] and source["added_by"] != username:
            raise HTTPException(
                status_code=status.HTTP_403_FORBIDDEN,
                detail="Domain enthaelt Quellen anderer Nutzer",
            )

    await db.execute(
        "DELETE FROM sources WHERE LOWER(domain) = ? AND tenant_id = ?",
        (domain_lower, tenant_id),
    )
    await db.commit()

    return {
        "domain": domain_lower,
        "deleted_count": len(rows),
    }


@router.post("", response_model=SourceResponse, status_code=status.HTTP_201_CREATED)
async def create_source(
    data: SourceCreate,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Neue Quelle hinzufuegen (org-spezifisch)."""
    tenant_id = current_user.get("tenant_id")

    # Domain normalisieren (Subdomain-Aliase auflösen, aus URL extrahieren)
    domain = data.domain
    if not domain and data.url:
        domain = _extract_domain(data.url)
    if domain:
        domain = _DOMAIN_ALIASES.get(domain.lower(), domain.lower())

    # Duplikat-Prüfung 1: gleiche URL bereits vorhanden? (tenant-übergreifend)
    if data.url:
        cursor = await db.execute(
            "SELECT id, name FROM sources WHERE url = ? AND status = 'active'",
            (data.url,),
        )
        existing = await cursor.fetchone()
        if existing:
            raise HTTPException(
                status_code=status.HTTP_409_CONFLICT,
                detail=f"Feed-URL bereits vorhanden: {existing['name']} (ID {existing['id']})",
            )

    # Duplikat-Prüfung 2: Domain bereits vorhanden? (tenant-übergreifend)
    if domain:
        cursor = await db.execute(
            "SELECT id, name, source_type FROM sources WHERE LOWER(domain) = ? AND status = 'active' AND (tenant_id IS NULL OR tenant_id = ?) LIMIT 1",
            (domain.lower(), tenant_id),
        )
        domain_existing = await cursor.fetchone()
        if domain_existing:
            if data.source_type == "web_source":
                raise HTTPException(
                    status_code=status.HTTP_409_CONFLICT,
                    detail=f"Web-Quelle für '{domain}' bereits vorhanden: {domain_existing['name']}",
                )
            if not data.url:
                raise HTTPException(
                    status_code=status.HTTP_409_CONFLICT,
                    detail=f"Domain '{domain}' bereits als Quelle vorhanden: {domain_existing['name']}. Für einen neuen RSS-Feed bitte die Feed-URL angeben.",
                )

    cursor = await db.execute(
        """INSERT INTO sources (name, url, domain, source_type, category, status, notes, added_by, tenant_id)
           VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)""",
        (
            data.name,
            data.url,
            domain,
            data.source_type,
            data.category,
            data.status,
            data.notes,
            current_user["username"],
            tenant_id,
        ),
    )
    await db.commit()

    cursor = await db.execute("SELECT * FROM sources WHERE id = ?", (cursor.lastrowid,))
    row = await cursor.fetchone()
    return dict(row)


@router.put("/{source_id}", response_model=SourceResponse)
async def update_source(
    source_id: int,
    data: SourceUpdate,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Quelle bearbeiten."""
    cursor = await db.execute("SELECT * FROM sources WHERE id = ?", (source_id,))
    row = await cursor.fetchone()
    if not row:
        raise HTTPException(status_code=404, detail="Quelle nicht gefunden")

    if row["tenant_id"] is None:
        raise HTTPException(status_code=403, detail="Grundquellen koennen nur ueber die Verwaltung bearbeitet werden")

    _check_source_ownership(dict(row), current_user["username"])

    updates = {}
    for field, value in data.model_dump(exclude_none=True).items():
        if field not in SOURCE_UPDATE_COLUMNS:
            continue
        # Domain normalisieren
        if field == "domain" and value:
            value = _DOMAIN_ALIASES.get(value.lower(), value.lower())
        updates[field] = value

    if not updates:
        return dict(row)

    set_clause = ", ".join(f"{k} = ?" for k in updates)
    values = list(updates.values()) + [source_id]

    await db.execute(f"UPDATE sources SET {set_clause} WHERE id = ?", values)
    await db.commit()

    cursor = await db.execute("SELECT * FROM sources WHERE id = ?", (source_id,))
    row = await cursor.fetchone()
    return dict(row)


@router.delete("/{source_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_source(
    source_id: int,
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Quelle loeschen."""
    cursor = await db.execute("SELECT * FROM sources WHERE id = ?", (source_id,))
    row = await cursor.fetchone()
    if not row:
        raise HTTPException(status_code=404, detail="Quelle nicht gefunden")

    if row["tenant_id"] is None:
        raise HTTPException(status_code=403, detail="Grundquellen koennen nicht geloescht werden")

    _check_source_ownership(dict(row), current_user["username"])

    await db.execute("DELETE FROM sources WHERE id = ?", (source_id,))
    await db.commit()




@router.post("/telegram/validate")
async def validate_telegram_channel(
    data: dict,
    current_user: dict = Depends(get_current_user),
):
    """Prueft ob ein Telegram-Kanal erreichbar ist und gibt Kanalinfo zurueck."""
    channel_id = data.get("channel_id", "").strip()
    if not channel_id:
        raise HTTPException(status_code=400, detail="channel_id ist erforderlich")

    try:
        from feeds.telegram_parser import TelegramParser
        parser = TelegramParser()
        result = await parser.validate_channel(channel_id)
        if result:
            return result
        raise HTTPException(status_code=404, detail="Kanal nicht erreichbar oder nicht gefunden")
    except HTTPException:
        raise
    except Exception as e:
        logger.error("Telegram-Validierung fehlgeschlagen: %s", e, exc_info=True)
        raise HTTPException(status_code=500, detail="Telegram-Validierung fehlgeschlagen")


@router.post("/refresh-counts")
async def trigger_refresh_counts(
    current_user: dict = Depends(get_current_user),
    db: aiosqlite.Connection = Depends(db_dependency),
):
    """Artikelzaehler fuer alle Quellen neu berechnen."""
    await refresh_source_counts(db)
    return {"status": "ok"}