import sys
import os
import sqlite3
import subprocess
from urllib.parse import urlparse

BATCH_SIZE = 100000  # Insert in chunks of 100k to save RAM

# Embedded schema to make the script standalone[span_1](start_span)[span_1](end_span)
SCHEMA_SQL = """
-- 1. The Payload Table (Standard ROWID table)
-- 'id' becomes a direct alias for the SQLite rowid.
CREATE TABLE payload_data (
    id INTEGER PRIMARY KEY,
    json_record TEXT
);

-- 2. The Lookup Table (WITHOUT ROWID)
-- Clustered directly by SURT for extremely fast prefix/exact lookups.
CREATE TABLE surt_lookup (
    surt TEXT,
    capture_time INTEGER,
    payload_id INTEGER,
    PRIMARY KEY (surt, capture_time)
) WITHOUT ROWID;
"""

if len(sys.argv) < 2:
    print("Usage: uv run import_cdx.py <file-or-url>")
    sys.exit(1)

source = sys.argv[1]

# --- 1. Parse File Info and Compression ---
parsed_url = urlparse(source)
original_file_name = os.path.basename(parsed_url.path)

# Determine compression based strictly on the parsed path
is_zst = original_file_name.endswith('.zst')

# --- 2. Determine Database Name ---
if is_zst:
    base_name = original_file_name[:-4]
else:
    base_name = original_file_name

db_name = f"{base_name}.db"
print(f"Input source: {source}")
print(f"Target database: {db_name}")

# --- 3. Initialize Database and Schema ---
if not os.path.exists(db_name):
    print(f"Initializing {db_name} with embedded schema...")
    init_conn = sqlite3.connect(db_name)
    init_conn.executescript(SCHEMA_SQL)
    init_conn.close()

# --- 4. Setup Streaming Pipeline (curl/cat -> zstdcat) ---
is_url = source.startswith("http://") or source.startswith("https://")

fetch_process = None
decompress_process = None

if is_url:
    fetch_process = subprocess.Popen(["curl", "-sL", source], stdout=subprocess.PIPE)
    raw_stream = fetch_process.stdout
else:
    raw_stream = open(source, "rb")

if is_zst:
    decompress_process = subprocess.Popen(["zstdcat"], stdin=raw_stream, stdout=subprocess.PIPE)
    stream = decompress_process.stdout
else:
    stream = raw_stream

# --- 5. Process and Insert Data ---
connection = sqlite3.connect(db_name)
cursor = connection.cursor()

cursor.execute("PRAGMA journal_mode = WAL;")
cursor.execute("PRAGMA synchronous = NORMAL;")

cursor.execute("SELECT IFNULL(MAX(id), 0) FROM payload_data")
current_id = cursor.fetchone()[0]

payload_batch = []
lookup_batch = []

# Variables to track the last seen record for deduplication
last_surt = None
last_capture_time = None

cursor.execute("BEGIN TRANSACTION;")

print("Importing data (with duplicate filtering)...")
for line_bytes in stream:
    line = line_bytes.decode('utf-8', errors='replace').strip()
    if not line:
        continue

    parts = line.split(' ', 2)
    if len(parts) != 3:
        continue

    surt = parts[0]
    try:
        capture_time = int(parts[1])
    except ValueError:
        continue
    json_record = parts[2]

    # Deduplication check: skip if it matches the previous row's keys
    if surt == last_surt and capture_time == last_capture_time:
        continue

    # Update trackers for the next iteration
    last_surt = surt
    last_capture_time = capture_time

    current_id += 1

    payload_batch.append((current_id, json_record))
    lookup_batch.append((surt, capture_time, current_id))

    if len(payload_batch) >= BATCH_SIZE:
        cursor.executemany("INSERT INTO payload_data (id, json_record) VALUES (?, ?)", payload_batch)
        cursor.executemany("INSERT INTO surt_lookup (surt, capture_time, payload_id) VALUES (?, ?, ?)", lookup_batch)

        payload_batch.clear()
        lookup_batch.clear()
        print(f"Inserted up to ID {current_id} in {db_name}...")

# Cleanup leftover batch
if payload_batch:
    cursor.executemany("INSERT INTO payload_data (id, json_record) VALUES (?, ?)", payload_batch)
    cursor.executemany("INSERT INTO surt_lookup (surt, capture_time, payload_id) VALUES (?, ?, ?)", lookup_batch)

connection.commit()
connection.close()

# Close processes and files safely
if decompress_process:
    decompress_process.wait()
if fetch_process:
    fetch_process.wait()
elif not is_url:
    raw_stream.close()

print(f"Import fully complete for {db_name}!")