from sqlalchemy.orm import Session
from database import InstagramAccount, InstagramPost
from utils.boxapi_client import get_media, BoxAPIError
from utils.parser_fast import parse_boxapi_items_fast
from utils.seen_store import filter_unseen, mark_seen
from utils.s3_uploader import upload_media_from_url
from schemas import ScrapeRequest, ScrapedPost
from typing import List
from datetime import datetime


def scrape_and_store(db: Session, req: ScrapeRequest) -> List[ScrapedPost]:
    try:
        # 1) one BoxAPI call (fast) — we keep this single round trip
        # Ask for more to offset duplicates
        raw_items, log_path = get_media(req.username, max(req.max_count, 12))
    except BoxAPIError as e:
        print(f"❌ BoxAPI error: {e}")
        return []

    if not raw_items:
        return []

    # 2) normalize quickly
    normalized = parse_boxapi_items_fast(raw_items)

    # 3) apply cursor filter if provided (safe, optional)
    since_ts = getattr(req, "since_taken_at", None)
    if since_ts:
        try:
            since_ts = int(since_ts)
            normalized = [n for n in normalized if (n.get("taken_at") or 0) > since_ts]
        except Exception:
            # If since_taken_at is invalid, ignore it
            pass

    # 4) filter already-seen
    ids_in_order = [n["ig_post_id"] for n in normalized if n.get("ig_post_id")]
    unseen_ids = set(filter_unseen(req.username, ids_in_order))

    unseen = [n for n in normalized if n["ig_post_id"] in unseen_ids]

    # 5) take the next N unseen (newest first already)
    batch = unseen[:req.max_count]

    # 6) mark them seen (only what we return)
    mark_seen(req.username, [b["ig_post_id"] for b in batch])

    # 7) Get or create InstagramAccount
    account = db.query(InstagramAccount).filter_by(username=req.username).first()
    if not account:
        account = InstagramAccount(
            username=req.username,
            seller_id=req.seller_id,
            is_active=True,
            last_synced=None
        )
        db.add(account)
        db.commit()
        db.refresh(account)

    result: List[ScrapedPost] = []
    new_post_count = 0

    for item in batch:
        post_id = item["ig_post_id"]
        
        # Check if already in database
        if db.query(InstagramPost).filter_by(ig_post_id=post_id).first():
            continue

        # Filter media URLs to avoid duplicates (especially for videos)
        media_urls = list(item.get("remote_urls", []))

        if item["media_type"] == "video":
            thumb = (item.get("thumbnail_url") or "").strip()
            def is_video(u: str) -> bool:
                base = u.split("?", 1)[0].lower()
                return base.endswith((".mp4", ".mov", ".m4v", ".webm"))
            # keep only real video URLs; drop image covers and anything equal to the thumbnail
            media_urls = [u for u in media_urls if is_video(u) and u != thumb]

        # Upload remote URLs to S3 (optional - can be done async later)
        uploaded_urls: List[str] = []
        for remote_url in media_urls:
            try:
                local_url = upload_media_from_url(remote_url, str(req.seller_id), f"{post_id}/")
                if local_url:
                    uploaded_urls.append(local_url)
            except Exception as e:
                print(f"⚠️ Error uploading media: {e}")
                continue

        # Upload thumbnail (optional)
        final_thumbnail = item["thumbnail_url"]
        if item["thumbnail_url"]:
            try:
                thumb_uploaded = upload_media_from_url(item["thumbnail_url"], str(req.seller_id), f"{post_id}/thumbnail")
                if thumb_uploaded:
                    final_thumbnail = thumb_uploaded
            except Exception as e:
                print(f"⚠️ Failed to upload thumbnail: {e}")

        # Save to DB
        post_entry = InstagramPost(
            ig_post_id=post_id,
            account_id=account.id,
            media_type=item["media_type"],
            caption=item["caption"],
            thumbnail_url=final_thumbnail,
            local_media=uploaded_urls,  # Use filtered S3 URLs
            created_at=datetime.fromtimestamp(item["taken_at"]),
        )
        db.add(post_entry)
        db.commit()

        result.append(ScrapedPost(
            ig_post_id=post_id,
            media_type=item["media_type"],
            caption=item["caption"],
            thumbnail_url=final_thumbnail,
            local_media=uploaded_urls,  # Use filtered S3 URLs
            created_at=datetime.fromtimestamp(item["taken_at"])
        ))

        new_post_count += 1
        if new_post_count >= req.max_count:
            break

    return result