# --- imports ---
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
# use optimized uploaders; keep the generic fallback as well
from utils.s3_uploader import (
    upload_media_from_url,
    upload_image_from_url_optimized,
    upload_video_from_url_optimized,
)
from schemas import ScrapeRequest, ScrapedPost
from typing import List
from datetime import datetime


def scrape_and_store(db: Session, req: ScrapeRequest) -> List[ScrapedPost]:
    try:
        raw_items, log_path = get_media(req.username, max(req.max_count, 30))
    except BoxAPIError as e:
        print(f"❌ BoxAPI error: {e}")
        return []

    if not raw_items:
        return []

    normalized = parse_boxapi_items_fast(raw_items)

    # optional cursor filter
    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:
            pass

    # filter 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]

    # pick next N
    batch = unseen[:req.max_count]
    mark_seen(req.username, [b["ig_post_id"] for b in batch])

    # ensure account
    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 = str(item["ig_post_id"])          # ENSURE clean, no slashes
        seller_id = str(req.seller_id)

        # skip if already saved
        if db.query(InstagramPost).filter_by(ig_post_id=post_id).first():
            continue

        # media URL list (normalized parser gives remote_urls)
        media_urls = list(item.get("remote_urls", []))

        # If this is a video post, keep only true video 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"))
            media_urls = [u for u in media_urls if is_video(u) and u != thumb]

        # Upload media to S3 (optimized path)
        uploaded_urls: List[str] = []
        for remote_url in media_urls:
            try:
                if item["media_type"] == "video":
                    # optimized 480p H.264 CRF23 (+faststart)
                    url = upload_video_from_url_optimized(remote_url, seller_id, post_id)
                elif item["media_type"] in ("image", "carousel"):
                    # carousel items may be images; optimize to WebP
                    url = upload_image_from_url_optimized(remote_url, seller_id, post_id)
                    if url is None:
                        # some carousels include videos; try generic fallback
                        url = upload_media_from_url(remote_url, seller_id, post_id)
                else:
                    # unknown → generic detection/fallback
                    url = upload_media_from_url(remote_url, seller_id, post_id)

                if url:
                    uploaded_urls.append(url)
            except Exception as e:
                print(f"⚠️ Error uploading media: {e}")
                continue

        # Upload/optimize thumbnail (if present)
        final_thumbnail = item.get("thumbnail_url") or None
        if final_thumbnail:
            try:
                thumb_url = upload_image_from_url_optimized(final_thumbnail, seller_id, post_id)
                if thumb_url:
                    final_thumbnail = thumb_url
                else:
                    # fallback to generic (no optimize)
                    alt = upload_media_from_url(final_thumbnail, seller_id, post_id)
                    if alt:
                        final_thumbnail = alt
            except Exception as e:
                print(f"⚠️ Failed to upload thumbnail: {e}")

        # Save
        created_at = datetime.fromtimestamp(item["taken_at"]) if item.get("taken_at") else datetime.utcnow()
        post_entry = InstagramPost(
            ig_post_id=post_id,
            account_id=account.id,
            media_type=item["media_type"],
            caption=item.get("caption"),
            thumbnail_url=final_thumbnail,
            local_media=uploaded_urls,
            created_at=created_at,
        )
        db.add(post_entry)
        db.commit()

        result.append(ScrapedPost(
            ig_post_id=post_id,
            media_type=item["media_type"],
            caption=item.get("caption"),
            thumbnail_url=final_thumbnail,
            local_media=uploaded_urls,
            created_at=created_at,
        ))

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

    return result