#!/usr/bin/env python3
"""Sync canonical control tables between production and local DB.

Modes:
    --pull    Production → Local (initial sync, full table copy)
    --push    Local → Production (incremental, only new obligation_candidates)
    --loop    Run --push every N minutes (default 60)

Usage:
    python3 sync_db.py --pull                    # Full sync production → local
    python3 sync_db.py --push                    # Push new obligations to production
    python3 sync_db.py --loop 60                 # Push every 60 minutes
    python3 sync_db.py --pull --tables canonical_controls  # Only one table
"""
import argparse
import json
import os
import sys
import time
import urllib.parse

import io

import psycopg2
import psycopg2.extras
import psycopg2.extensions

# Register JSON adapter so dicts are automatically converted to JSONB
psycopg2.extensions.register_adapter(dict, psycopg2.extras.Json)

# ── DB Config ────────────────────────────────────────────────────────

PROD_URL = os.environ.get(
    "PROD_DATABASE_URL",
    "postgresql://postgres:GmyFD3wnU1NrKBdpU1nwLdE8MLts0A0eez8L5XXdvUCe05lWnWfVp3C6JJ8Yrmt2"
    "@46.225.100.82:54321/postgres?sslmode=require",
)
LOCAL_URL = os.environ.get(
    "LOCAL_DATABASE_URL",
    "postgresql://breakpilot:breakpilot123@localhost:5432/breakpilot_db",
)

SCHEMA = "compliance"

# Tables to sync (production → local)
SYNC_TABLES = [
    "canonical_control_frameworks",
    "canonical_control_licenses",
    "canonical_control_sources",
    "canonical_control_categories",
    "canonical_blocked_sources",
    "canonical_controls",
    "canonical_control_mappings",
    "canonical_processed_chunks",
    "canonical_generation_jobs",
    "control_patterns",
    "crosswalk_matrix",
    "obligation_extractions",
    "obligation_candidates",
]


def connect(url, label="DB"):
    parsed = urllib.parse.urlparse(url)
    params = dict(urllib.parse.parse_qsl(parsed.query))
    conn = psycopg2.connect(
        host=parsed.hostname,
        port=parsed.port or 5432,
        user=parsed.username,
        password=parsed.password,
        dbname=parsed.path.lstrip("/"),
        sslmode=params.get("sslmode", "prefer"),
        options=f"-c search_path={SCHEMA},public",
        keepalives=1,
        keepalives_idle=30,
        keepalives_interval=10,
        keepalives_count=5,
    )
    conn.autocommit = False
    print(f"  Connected to {label} ({parsed.hostname}:{parsed.port or 5432})")
    return conn


def get_columns(cur, table):
    cur.execute(f"""
        SELECT column_name FROM information_schema.columns
        WHERE table_schema = '{SCHEMA}' AND table_name = '{table}'
        ORDER BY ordinal_position
    """)
    return [r[0] for r in cur.fetchall()]


def pull_table(prod_conn, local_conn, table):
    """Copy entire table from production to local via SELECT + INSERT."""
    prod_cur = prod_conn.cursor()
    local_cur = local_conn.cursor()

    # Check table exists on production
    prod_cur.execute(f"""
        SELECT 1 FROM pg_tables
        WHERE schemaname = '{SCHEMA}' AND tablename = '{table}'
    """)
    if not prod_cur.fetchone():
        print(f"    SKIP {table} — not found on production")
        return 0

    # Drop local table
    local_cur.execute(f"DROP TABLE IF EXISTS {SCHEMA}.{table} CASCADE")
    local_conn.commit()

    # Build simple CREATE TABLE (no constraints, no defaults — just for data)
    prod_cur.execute(f"""
        SELECT column_name, data_type, udt_name, character_maximum_length
        FROM information_schema.columns
        WHERE table_schema = '{SCHEMA}' AND table_name = '{table}'
        ORDER BY ordinal_position
    """)
    col_defs = prod_cur.fetchall()

    parts = []
    col_names = []
    jsonb_cols = set()
    for name, dtype, udt, max_len in col_defs:
        col_names.append(name)
        if dtype == "ARRAY":
            type_map = {
                "_text": "text[]", "_varchar": "varchar[]",
                "_int4": "integer[]", "_uuid": "uuid[]",
                "_jsonb": "jsonb[]", "_float8": "float8[]",
            }
            sql_type = type_map.get(udt, f"{udt.lstrip('_')}[]")
        elif dtype == "USER-DEFINED" and udt == "jsonb":
            sql_type = "jsonb"
            jsonb_cols.add(name)
        elif dtype == "USER-DEFINED":
            sql_type = udt
        elif dtype == "jsonb":
            sql_type = "jsonb"
            jsonb_cols.add(name)
        elif max_len:
            sql_type = f"{dtype}({max_len})"
        else:
            sql_type = dtype
        parts.append(f'"{name}" {sql_type}')

    ddl = f"CREATE TABLE {SCHEMA}.{table} ({', '.join(parts)})"
    local_cur.execute(ddl)
    local_conn.commit()

    # Fetch all rows from production
    col_list = ", ".join(f'"{c}"' for c in col_names)
    prod_cur.execute(f"SELECT {col_list} FROM {SCHEMA}.{table}")
    rows = prod_cur.fetchall()

    if rows:
        # Wrap dict/list values in Json for JSONB columns
        adapted_rows = []
        for row in rows:
            adapted = []
            for i, val in enumerate(row):
                if col_names[i] in jsonb_cols and isinstance(val, (dict, list)):
                    adapted.append(psycopg2.extras.Json(val))
                else:
                    adapted.append(val)
            adapted_rows.append(tuple(adapted))

        placeholders = ", ".join(["%s"] * len(col_names))
        insert_sql = f'INSERT INTO {SCHEMA}.{table} ({col_list}) VALUES ({placeholders})'
        psycopg2.extras.execute_batch(local_cur, insert_sql, adapted_rows, page_size=500)
        local_conn.commit()

    print(f"    {table}: {len(rows)} rows")
    return len(rows)


def pull(tables=None):
    """Full sync: production → local."""
    print("\n=== PULL: Production → Local ===\n")

    prod_conn = connect(PROD_URL, "Production")
    local_conn = connect(LOCAL_URL, "Local")

    # Ensure schema exists
    local_cur = local_conn.cursor()
    local_cur.execute(f"CREATE SCHEMA IF NOT EXISTS {SCHEMA}")
    local_conn.commit()

    sync_list = tables if tables else SYNC_TABLES
    total = 0

    for table in sync_list:
        try:
            count = pull_table(prod_conn, local_conn, table)
            total += count
        except Exception as e:
            print(f"    ERROR {table}: {e}")
            local_conn.rollback()
            prod_conn.rollback()

    print(f"\n  Total: {total} rows synced")
    prod_conn.close()
    local_conn.close()


def push():
    """Incremental push: new obligation_candidates local → production."""
    print(f"\n=== PUSH: Local → Production ({time.strftime('%H:%M:%S')}) ===\n")

    local_conn = connect(LOCAL_URL, "Local")
    prod_conn = connect(PROD_URL, "Production")

    local_cur = local_conn.cursor()
    prod_cur = prod_conn.cursor()

    # Find obligation_candidates in local that don't exist in production
    # Use candidate_id as the unique key
    local_cur.execute(f"""
        SELECT candidate_id FROM {SCHEMA}.obligation_candidates
    """)
    local_ids = {r[0] for r in local_cur.fetchall()}

    if not local_ids:
        print("  No obligation_candidates in local DB")
        local_conn.close()
        prod_conn.close()
        return 0

    # Check which already exist on production
    prod_cur.execute(f"""
        SELECT candidate_id FROM {SCHEMA}.obligation_candidates
    """)
    prod_ids = {r[0] for r in prod_cur.fetchall()}

    new_ids = local_ids - prod_ids
    if not new_ids:
        print(f"  All {len(local_ids)} obligations already on production")
        local_conn.close()
        prod_conn.close()
        return 0

    print(f"  {len(new_ids)} new obligations to push (local: {len(local_ids)}, prod: {len(prod_ids)})")

    # Get columns
    columns = get_columns(local_cur, "obligation_candidates")
    col_list = ", ".join(columns)
    placeholders = ", ".join(["%s"] * len(columns))

    # Fetch new rows from local
    id_list = ", ".join(f"'{i}'" for i in new_ids)
    local_cur.execute(f"""
        SELECT {col_list} FROM {SCHEMA}.obligation_candidates
        WHERE candidate_id IN ({id_list})
    """)
    rows = local_cur.fetchall()

    # Insert into production
    insert_sql = f"INSERT INTO {SCHEMA}.obligation_candidates ({col_list}) VALUES ({placeholders}) ON CONFLICT DO NOTHING"
    psycopg2.extras.execute_batch(prod_cur, insert_sql, rows, page_size=100)
    prod_conn.commit()

    print(f"  Pushed {len(rows)} obligations to production")

    local_conn.close()
    prod_conn.close()
    return len(rows)


def loop(interval_min):
    """Run push every N minutes."""
    print(f"\n=== SYNC LOOP — Push every {interval_min} min ===")
    print(f"  Started at {time.strftime('%Y-%m-%d %H:%M:%S')}")
    print(f"  Press Ctrl+C to stop\n")

    while True:
        try:
            pushed = push()
            if pushed:
                print(f"  Next sync in {interval_min} min...")
        except Exception as e:
            print(f"  SYNC ERROR: {e}")
        time.sleep(interval_min * 60)


def main():
    parser = argparse.ArgumentParser(description="Sync canonical control tables")
    parser.add_argument("--pull", action="store_true", help="Production → Local (full copy)")
    parser.add_argument("--push", action="store_true", help="Local → Production (new obligations)")
    parser.add_argument("--loop", type=int, metavar="MIN", help="Push every N minutes")
    parser.add_argument("--tables", nargs="+", help="Only sync specific tables (with --pull)")
    args = parser.parse_args()

    if not any([args.pull, args.push, args.loop]):
        parser.print_help()
        return

    if args.pull:
        pull(args.tables)

    if args.push:
        push()

    if args.loop:
        loop(args.loop)


if __name__ == "__main__":
    main()