"""Create minimal landing zone seed files so SQLMesh models can run before real data arrives.

Each seed contains one null/empty record that is filtered out by the staging model's
WHERE clause. Seeds live in the 1970/01 epoch so they're never confused with real data.

Usage:
    uv run python scripts/init_landing_seeds.py [--landing-dir data/landing]

Idempotent: skips existing files.
"""

import argparse
import gzip
import json
from pathlib import Path


def create_seed(dest: Path, content: bytes, *, compress: bool = True) -> None:
    """Write content to a seed file atomically. Skips if the file already exists.

    compress=True (default) writes gzipped content, suitable for all landing zone
    files. compress=False writes raw bytes — required for files consumed by DuckDB
    ST_Read (e.g. GeoJSON), which cannot read .gz files.
    """
    if dest.exists():
        return
    dest.parent.mkdir(parents=True, exist_ok=True)
    tmp = dest.with_suffix(dest.suffix + ".tmp")
    if compress:
        with gzip.open(tmp, "wb") as f:
            f.write(content)
    else:
        tmp.write_bytes(content)
    tmp.rename(dest)
    print(f"  created: {dest}")


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--landing-dir", default="data/landing", type=Path)
    args = parser.parse_args()
    base: Path = args.landing_dir

    seeds = {
        # --- Playtomic tenants ---
        # JSONL: one null tenant (filtered by WHERE tenant_id IS NOT NULL)
        "playtomic/1970/01/tenants.jsonl.gz":
            b'{"tenant_id":null}\n',
        # Blob: empty tenants array
        "playtomic/1970/01/tenants.json.gz":
            json.dumps({"tenants": [], "count": 0}).encode(),

        # --- Playtomic availability (morning) ---
        # JSONL: one null venue (filtered by WHERE tenant_id IS NOT NULL)
        "playtomic/1970/01/availability_1970-01-01.jsonl.gz":
            b'{"tenant_id":null,"date":"1970-01-01","captured_at_utc":"1970-01-01T00:00:00Z","slots":null}\n',
        # Blob: empty venues array
        "playtomic/1970/01/availability_1970-01-01.json.gz":
            json.dumps({"date": "1970-01-01", "captured_at_utc": "1970-01-01T00:00:00Z",
                        "venue_count": 0, "venues": []}).encode(),

        # --- Playtomic recheck ---
        # JSONL: one null venue (filtered by WHERE tenant_id IS NOT NULL)
        "playtomic/1970/01/availability_1970-01-01_recheck_00.jsonl.gz":
            b'{"tenant_id":null,"date":"1970-01-01","captured_at_utc":"1970-01-01T00:00:00Z","recheck_hour":0,"slots":null}\n',
        # Blob: empty venues array (old format, kept for transition)
        "playtomic/1970/01/availability_1970-01-01_recheck_00.json.gz":
            json.dumps({"date": "1970-01-01", "captured_at_utc": "1970-01-01T00:00:00Z",
                        "recheck_hour": 0, "venues": []}).encode(),

        # --- GeoNames ---
        # JSONL: one null city (filtered by WHERE geoname_id IS NOT NULL)
        "geonames/1970/01/cities_global.jsonl.gz":
            b'{"geoname_id":null}\n',
        # Blob: empty rows array
        "geonames/1970/01/cities_global.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),

        # --- Overpass tennis ---
        # JSONL: one null element (filtered by WHERE type IS NOT NULL)
        "overpass_tennis/1970/01/courts.jsonl.gz":
            b'{"type":null,"id":null}\n',
        # Blob: empty elements array
        "overpass_tennis/1970/01/courts.json.gz":
            json.dumps({"version": 0.6, "elements": []}).encode(),

        # --- Overpass padel (unchanged format) ---
        "overpass/1970/01/courts.json.gz":
            json.dumps({"version": 0.6, "elements": []}).encode(),

        # --- Eurostat ---
        "eurostat/1970/01/urb_cpop1.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
        "eurostat/1970/01/ilc_di03.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
        "eurostat/1970/01/nama_10r_2hhinc.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
        "census_usa/1970/01/acs5_state_income.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
        "eurostat_city_labels/1970/01/cities_codelist.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),

        # --- National statistics ---
        "ons_uk/1970/01/lad_population.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
        "census_usa/1970/01/acs5_places.json.gz":
            json.dumps({"rows": [], "count": 0}).encode(),
    }

    # Uncompressed seeds — required for files consumed by ST_Read (cannot read .gz)
    uncompressed_seeds = {
        # Empty NUTS-2 boundary placeholder so stg_nuts2_boundaries can run before
        # the real file is downloaded via scripts/download_gisco_nuts.py.
        # ST_Read on an empty FeatureCollection returns 0 rows (graceful degradation:
        # all locations fall back to country-level income until the real file lands).
        "gisco/1970/01/nuts2_boundaries.geojson":
            b'{"type":"FeatureCollection","features":[]}',
    }

    print(f"Initialising landing seeds in: {base}")
    for rel_path, content in seeds.items():
        create_seed(base / rel_path, content)
    for rel_path, content in uncompressed_seeds.items():
        create_seed(base / rel_path, content, compress=False)
    print("Done.")


if __name__ == "__main__":
    main()
