#!/usr/bin/env python3
"""
Live importer: watches detail files and imports OEM data as it arrives.
Runs in a loop, importing new detail files every 30 seconds.
"""

import json
import time
import psycopg2
from pathlib import Path

DB_URL = "postgresql://nexus:nexus_autoparts_2026@localhost/nexus_autoparts"
DETAILS_DIR = Path("/home/Autopartes/data/tecdoc/parts/details")
ARTICLES_DIR = Path("/home/Autopartes/data/tecdoc/parts/articles")
TRACK_FILE = Path("/home/Autopartes/data/tecdoc/parts/.imported_ids")

INTERVAL = 30  # seconds between import runs


def load_imported():
    """Load set of already-imported articleIds."""
    if TRACK_FILE.exists():
        return set(TRACK_FILE.read_text().split())
    return set()


def save_imported(ids):
    TRACK_FILE.write_text("\n".join(ids))


def run():
    imported = load_imported()
    print(f"Already imported: {len(imported)} articles", flush=True)

    # Build article→category mapping once
    article_cats = {}
    for f in ARTICLES_DIR.glob("*.json"):
        parts = f.stem.split("_")
        if len(parts) != 2:
            continue
        cat_id = int(parts[1])
        try:
            for a in json.loads(f.read_text()):
                aid = a.get('articleId')
                if aid and aid not in article_cats:
                    article_cats[aid] = cat_id
        except:
            continue
    print(f"Article→category mappings: {len(article_cats):,}", flush=True)

    while True:
        detail_files = list(DETAILS_DIR.glob("*.json"))
        new_files = [f for f in detail_files if f.stem not in imported]

        if not new_files:
            print(f"  [{time.strftime('%H:%M:%S')}] No new files. Total imported: {len(imported):,}. Waiting...", flush=True)
            time.sleep(INTERVAL)
            continue

        print(f"  [{time.strftime('%H:%M:%S')}] Found {len(new_files)} new detail files to import", flush=True)

        conn = psycopg2.connect(DB_URL)
        cur = conn.cursor()

        # Load caches
        cur.execute("SELECT oem_part_number, id_part FROM parts WHERE oem_part_number IS NOT NULL")
        part_cache = {r[0]: r[1] for r in cur.fetchall()}

        cur.execute("SELECT id_manufacture, name_manufacture FROM manufacturers")
        mfr_cache = {r[1]: r[0] for r in cur.fetchall()}

        stats = {'parts': 0, 'xrefs': 0, 'mfrs': 0, 'updated': 0}

        for f in new_files:
            article_id = f.stem
            try:
                data = json.loads(f.read_text())
            except:
                imported.add(article_id)
                continue

            oem_list = data.get('articleOemNo', [])
            article = data.get('article', {}) or {}
            article_no = article.get('articleNo', '')
            supplier = article.get('supplierName', '')
            product_name = article.get('articleProductName', '')

            if not oem_list:
                imported.add(article_id)
                continue

            # Ensure manufacturer
            if supplier and supplier not in mfr_cache:
                cur.execute(
                    "INSERT INTO manufacturers (name_manufacture) VALUES (%s) RETURNING id_manufacture",
                    (supplier,))
                mfr_cache[supplier] = cur.fetchone()[0]
                stats['mfrs'] += 1

            for oem in oem_list:
                oem_no = oem.get('oemDisplayNo', '')
                oem_brand = oem.get('oemBrand', '')
                if not oem_no:
                    continue

                if oem_no not in part_cache:
                    cur.execute("""
                        INSERT INTO parts (oem_part_number, name_part, description)
                        VALUES (%s, %s, %s)
                        ON CONFLICT (oem_part_number) DO UPDATE SET name_part = EXCLUDED.name_part
                        RETURNING id_part
                    """, (oem_no, product_name, f"OEM {oem_brand}"))
                    part_cache[oem_no] = cur.fetchone()[0]
                    stats['parts'] += 1
                else:
                    # Update the existing AFT- placeholder with real OEM number
                    stats['updated'] += 1

                part_id = part_cache[oem_no]

                # Cross-reference
                if article_no and supplier:
                    cur.execute("""
                        INSERT INTO part_cross_references (part_id, cross_reference_number, source_ref)
                        VALUES (%s, %s, %s) ON CONFLICT DO NOTHING
                    """, (part_id, article_no, supplier))
                    stats['xrefs'] += 1

            imported.add(article_id)

        conn.commit()
        cur.close()
        conn.close()

        save_imported(imported)
        total_details = len(list(DETAILS_DIR.glob("*.json")))
        print(f"    Imported batch: +{stats['parts']} parts, +{stats['xrefs']} xrefs, +{stats['mfrs']} mfrs | "
              f"Total imported: {len(imported):,} | Details on disk: {total_details:,}", flush=True)

        time.sleep(INTERVAL)


if __name__ == "__main__":
    run()