#!/usr/bin/env python3
"""Store batch run results into a SQLite database.

Reads the aggregate JSON report written by the batch runner and inserts
all camera-level + summary data. Safe to run multiple times — uses
(date, location, camera_id) as the unique key, so re-runs update
existing rows instead of duplicating.

Usage:
    python3 store_results.py /path/to/output/counts_2026-06-10.json --location kandang-atas
    python3 store_results.py /path/to/output/counts_2026-06-10.json --db /var/lib/chickens.db
"""

from __future__ import annotations

import argparse
import json
import sqlite3
import sys
from pathlib import Path


CREATE_TABLE = """
CREATE TABLE IF NOT EXISTS batch_runs (
    id         INTEGER PRIMARY KEY AUTOINCREMENT,
    date       TEXT    NOT NULL,
    location   TEXT    NOT NULL,
    camera_id  TEXT    NOT NULL,
    total_entered      INTEGER NOT NULL DEFAULT 0,
    frames_processed   INTEGER NOT NULL DEFAULT 0,
    elapsed_seconds    REAL    NOT NULL DEFAULT 0.0,
    stopped_reason     TEXT    NOT NULL DEFAULT '',
    source_video       TEXT    NOT NULL DEFAULT '',
    generated_at       TEXT    NOT NULL DEFAULT '',
    UNIQUE(date, location, camera_id)
)
"""

INSERT_SQL = """
INSERT INTO batch_runs
    (date, location, camera_id, total_entered, frames_processed,
     elapsed_seconds, stopped_reason, source_video, generated_at)
VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
ON CONFLICT(date, location, camera_id) DO UPDATE SET
    total_entered     = excluded.total_entered,
    frames_processed   = excluded.frames_processed,
    elapsed_seconds    = excluded.elapsed_seconds,
    stopped_reason     = excluded.stopped_reason,
    source_video       = excluded.source_video,
    generated_at       = excluded.generated_at
"""

SUMMARY_QUERY = """
SELECT
    date,
    location,
    COUNT(*)                         AS camera_count,
    SUM(total_entered)               AS total_chickens,
    SUM(elapsed_seconds)             AS total_seconds,
    ROUND(SUM(elapsed_seconds) / 60.0, 1) AS total_minutes
FROM batch_runs
WHERE date = ? AND location = ?
GROUP BY date, location
"""


def store_report(report_path: str, location: str, db_path: str) -> None:
    with open(report_path) as f:
        report = json.load(f)

    date = report["date"]
    cameras = report["cameras"]
    generated_at = report.get("generated_at", "")

    Path(db_path).parent.mkdir(parents=True, exist_ok=True)
    conn = sqlite3.connect(db_path)
    conn.execute("PRAGMA journal_mode=WAL")
    conn.execute(CREATE_TABLE)

    rows = 0
    for camera_id, entry in cameras.items():
        if entry.get("skipped"):
            continue
        conn.execute(INSERT_SQL, (
            date, location, camera_id,
            entry.get("total_entered", 0),
            entry.get("frames_processed", 0),
            entry.get("elapsed_seconds", 0),
            entry.get("stopped_reason", ""),
            entry.get("source_video", ""),
            generated_at,
        ))
        rows += 1

    conn.commit()

    # print summary
    row = conn.execute(SUMMARY_QUERY, (date, location)).fetchone()
    if row:
        print(f"\n[db] {row[0]} | {row[1]} | {row[2]} cameras | "
              f"{row[3]} chickens | {row[4]:.0f}s ({row[5]} min)")

    # also print per-camera breakdown
    cur = conn.execute(
        "SELECT camera_id, total_entered, elapsed_seconds "
        "FROM batch_runs WHERE date=? AND location=? ORDER BY camera_id",
        (date, location))
    for cam_id, count, secs in cur:
        print(f"  {cam_id}: {count} chickens, {secs:.0f}s")

    conn.close()
    print(f"\n[db] wrote {rows} rows to {db_path}")


def main():
    parser = argparse.ArgumentParser(
        description="Store batch run results into SQLite")
    parser.add_argument("report", help="Path to counts_YYYY-MM-DD.json")
    parser.add_argument("--location", required=True, help="Location name (e.g. kandang-atas)")
    parser.add_argument("--db", default="chicken_counts.db", help="SQLite database path")
    args = parser.parse_args()

    if not Path(args.report).exists():
        print(f"error: report not found: {args.report}", file=sys.stderr)
        sys.exit(1)

    store_report(args.report, args.location, args.db)


if __name__ == "__main__":
    main()