"""
test_db_snapshot.py — unit tests for sfm/db_snapshot.py (snapshot/restore
helpers behind the /db/snapshot, /db/waveforms/recent.zip, /db/restore routes).

Run:
    python -m pytest tests/test_db_snapshot.py -v
"""
from __future__ import annotations
import os
import sys
import sqlite3
from pathlib import Path

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))


def _make_db(path: Path, rows: int = 3) -> None:
    conn = sqlite3.connect(str(path))
    conn.execute("CREATE TABLE t (id INTEGER PRIMARY KEY, v TEXT)")
    conn.executemany("INSERT INTO t (v) VALUES (?)", [(f"row{i}",) for i in range(rows)])
    conn.commit()
    conn.close()


def _seed_event(db_path: Path, serial: str, fn: str, ts: str) -> None:
    conn = sqlite3.connect(str(db_path))
    conn.execute(
        "INSERT INTO events (id, serial, waveform_key, timestamp, "
        "blastware_filename, a5_pickle_filename, sidecar_filename, false_trigger) "
        "VALUES (?, ?, ?, ?, ?, ?, ?, 0)",
        (f"id-{fn}", serial, fn[:8], ts, fn, f"{fn}.a5.pkl", f"{fn}.sfm.json"),
    )
    conn.commit()
    conn.close()


def test_snapshot_db_produces_queryable_copy(tmp_path):
    from sfm.db_snapshot import snapshot_db
    src = tmp_path / "src.db"
    _make_db(src, rows=5)
    dest = tmp_path / "snap.db"
    out = snapshot_db(src, dest)
    assert out == dest and dest.exists()
    conn = sqlite3.connect(str(dest))
    n = conn.execute("SELECT COUNT(*) FROM t").fetchone()[0]
    conn.close()
    assert n == 5