#!/usr/bin/env python3
"""
Migrate data from SQLite databases to PostgreSQL.

Usage (from repo root):
    docker compose run --rm bot python3 scripts/migrate_sqlite_to_pg.py

Or locally (PostgreSQL must be reachable):
    DATABASE_URL=postgresql://bot:botpass@localhost:5432/botdb python3 scripts/migrate_sqlite_to_pg.py

SQLite sources expected in ./db/:
    economy.sqlite3     → user_balances, deposits, loans, transactions, taxes,
                          economy_settings, daily_activity, central_bank, penis_stats
    bets.sqlite3        → bets
    chat_history.sqlite3→ chat_history, chat_state, talk_history, talk_state
    penis_stats.sqlite3 → (legacy) length column → user_balances.balance + penis_stats
"""

import os
import sqlite3
import sys
from pathlib import Path

import psycopg2
import psycopg2.extras

DB_DIR = Path(os.getenv("SQLITE_DIR", "/db"))
DATABASE_URL = os.getenv("DATABASE_URL", "postgresql://bot:botpass@postgres:5432/botdb")

ECONOMY_DB = DB_DIR / "economy.sqlite3"
BETS_DB = DB_DIR / "bets.sqlite3"
CHAT_DB = DB_DIR / "chat_history.sqlite3"
PENIS_LEGACY_DB = DB_DIR / "penis_stats.sqlite3"


def open_sqlite(path: Path) -> sqlite3.Connection | None:
    if not path.exists():
        print(f"  [skip] {path} not found")
        return None
    conn = sqlite3.connect(path)
    conn.row_factory = sqlite3.Row
    return conn


def migrate_economy(pg: psycopg2.extensions.connection) -> None:
    src = open_sqlite(ECONOMY_DB)
    if src is None:
        return

    cur = pg.cursor()

    # --- user_balances ---
    rows = src.execute("SELECT * FROM user_balances").fetchall()
    print(f"  user_balances: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO user_balances (user_id, balance, daily_income, last_daily_reset, created_at)
            VALUES (%s, %s, %s, %s, %s)
            ON CONFLICT (user_id) DO UPDATE SET
                balance        = EXCLUDED.balance,
                daily_income   = EXCLUDED.daily_income,
                last_daily_reset = EXCLUDED.last_daily_reset
        """, (
            r["user_id"],
            r["balance"],
            r["daily_income"],
            r["last_daily_reset"] or None,
            r["created_at"] or None,
        ))

    # --- deposits ---
    rows = src.execute("SELECT * FROM deposits").fetchall()
    print(f"  deposits: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO deposits (id, user_id, amount, interest_rate, created_at, matures_at, is_active)
            VALUES (%s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["user_id"], r["amount"], r["interest_rate"],
            r["created_at"] or None, r["matures_at"] or None,
            bool(r["is_active"]),
        ))
    _reset_sequence(cur, "deposits", "id")

    # --- loans ---
    rows = src.execute("SELECT * FROM loans").fetchall()
    print(f"  loans: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO loans (id, user_id, amount, interest_rate, created_at, due_at, is_repaid)
            VALUES (%s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["user_id"], r["amount"], r["interest_rate"],
            r["created_at"] or None, r["due_at"] or None,
            bool(r["is_repaid"]),
        ))
    _reset_sequence(cur, "loans", "id")

    # --- transactions ---
    rows = src.execute("SELECT * FROM transactions").fetchall()
    print(f"  transactions: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO transactions (id, from_user_id, to_user_id, amount, transaction_type, description, created_at)
            VALUES (%s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["from_user_id"], r["to_user_id"], r["amount"],
            r["transaction_type"], r["description"], r["created_at"] or None,
        ))
    _reset_sequence(cur, "transactions", "id")

    # --- taxes ---
    rows = src.execute("SELECT * FROM taxes").fetchall()
    print(f"  taxes: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO taxes (id, user_id, amount, tax_date, created_at)
            VALUES (%s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["user_id"], r["amount"],
            r["tax_date"] or None, r["created_at"] or None,
        ))
    _reset_sequence(cur, "taxes", "id")

    # --- economy_settings ---
    rows = src.execute("SELECT * FROM economy_settings").fetchall()
    print(f"  economy_settings: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO economy_settings (key, value, updated_at)
            VALUES (%s, %s, %s)
            ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value
        """, (r["key"], r["value"], r["updated_at"] if "updated_at" in r.keys() else None))

    # --- daily_activity ---
    rows = src.execute("SELECT * FROM daily_activity").fetchall()
    print(f"  daily_activity: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO daily_activity (id, user_id, activity_date, message_count, last_activity_time, created_at)
            VALUES (%s, %s, %s, %s, %s, %s)
            ON CONFLICT (user_id, activity_date) DO UPDATE SET
                message_count      = EXCLUDED.message_count,
                last_activity_time = EXCLUDED.last_activity_time
        """, (
            r["id"], r["user_id"],
            r["activity_date"] or None, r["message_count"],
            r["last_activity_time"] or None, r["created_at"] or None,
        ))
    _reset_sequence(cur, "daily_activity", "id")

    # --- central_bank ---
    rows = src.execute("SELECT * FROM central_bank").fetchall()
    print(f"  central_bank: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO central_bank (id, capital, total_taxes_collected,
                total_inflation_adjustments, total_emissions, last_updated)
            VALUES (%s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO UPDATE SET
                capital                      = EXCLUDED.capital,
                total_taxes_collected        = EXCLUDED.total_taxes_collected,
                total_inflation_adjustments  = EXCLUDED.total_inflation_adjustments,
                total_emissions              = EXCLUDED.total_emissions,
                last_updated                 = EXCLUDED.last_updated
        """, (
            r["id"], r["capital"],
            r["total_taxes_collected"], r["total_inflation_adjustments"],
            r["total_emissions"], r["last_updated"] or None,
        ))

    # --- penis_stats (new schema: user_id, display_name, last_used_ts) ---
    try:
        rows = src.execute("SELECT * FROM penis_stats").fetchall()
        print(f"  penis_stats: {len(rows)} rows")
        cols = rows[0].keys() if rows else []
        for r in rows:
            if "last_used_ts" in cols:
                cur.execute("""
                    INSERT INTO penis_stats (user_id, display_name, last_used_ts)
                    VALUES (%s, %s, %s)
                    ON CONFLICT (user_id) DO UPDATE SET
                        display_name = EXCLUDED.display_name,
                        last_used_ts = EXCLUDED.last_used_ts
                """, (r["user_id"], r["display_name"], r["last_used_ts"]))
            else:
                # old schema without last_used_ts
                cur.execute("""
                    INSERT INTO penis_stats (user_id, display_name)
                    VALUES (%s, %s)
                    ON CONFLICT (user_id) DO UPDATE SET display_name = EXCLUDED.display_name
                """, (r["user_id"], r.get("display_name", "")))
    except sqlite3.OperationalError as e:
        print(f"  [warn] penis_stats in economy.sqlite3: {e}")

    src.close()
    pg.commit()
    print("  economy.sqlite3 done")


def migrate_legacy_penis(pg: psycopg2.extensions.connection) -> None:
    """Old penis_stats.sqlite3 had a `length` column — map it to user_balances.balance."""
    src = open_sqlite(PENIS_LEGACY_DB)
    if src is None:
        return

    cur = pg.cursor()
    try:
        rows = src.execute("SELECT user_id, length, display_name FROM penis_stats").fetchall()
    except sqlite3.OperationalError:
        rows = src.execute("SELECT * FROM penis_stats").fetchall()

    print(f"  penis_stats.sqlite3 (legacy): {len(rows)} rows")
    for r in rows:
        uid = r["user_id"]
        length = r["length"] if "length" in r.keys() else 0.0
        name = r["display_name"] if "display_name" in r.keys() else ""
        last_ts = r["last_used_ts"] if "last_used_ts" in r.keys() else None

        # upsert into user_balances; don't overwrite if already migrated from economy.sqlite3
        cur.execute("""
            INSERT INTO user_balances (user_id, balance)
            VALUES (%s, %s)
            ON CONFLICT (user_id) DO NOTHING
        """, (uid, float(length)))

        cur.execute("""
            INSERT INTO penis_stats (user_id, display_name, last_used_ts)
            VALUES (%s, %s, %s)
            ON CONFLICT (user_id) DO UPDATE SET
                display_name = EXCLUDED.display_name,
                last_used_ts = COALESCE(EXCLUDED.last_used_ts, penis_stats.last_used_ts)
        """, (uid, name, last_ts))

    src.close()
    pg.commit()
    print("  penis_stats.sqlite3 done")


def migrate_bets(pg: psycopg2.extensions.connection) -> None:
    src = open_sqlite(BETS_DB)
    if src is None:
        return

    cur = pg.cursor()

    rows = src.execute("SELECT * FROM bets").fetchall()
    print(f"  bets: {len(rows)} rows")
    cols = rows[0].keys() if rows else []
    for r in rows:
        cur.execute("""
            INSERT INTO bets (id, user_id, match_id, sport, home_team, away_team,
                chosen_team, amount, odds, status, payout, created_ts, resolved_ts)
            VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["user_id"], r["match_id"], r["sport"],
            r["home_team"], r["away_team"], r["chosen_team"],
            r["amount"], r["odds"], r["status"],
            r["payout"] if "payout" in cols else 0,
            r["created_ts"] if "created_ts" in cols else None,
            r["resolved_ts"] if "resolved_ts" in cols else None,
        ))
    _reset_sequence(cur, "bets", "id")

    src.close()
    pg.commit()
    print("  bets.sqlite3 done")


def migrate_chat(pg: psycopg2.extensions.connection) -> None:
    src = open_sqlite(CHAT_DB)
    if src is None:
        return

    cur = pg.cursor()

    # --- chat_history ---
    rows = src.execute("SELECT * FROM chat_history").fetchall()
    print(f"  chat_history: {len(rows)} rows")
    cols = rows[0].keys() if rows else []
    for r in rows:
        cur.execute("""
            INSERT INTO chat_history (id, chat_id, role, name, text, created_at)
            VALUES (%s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["chat_id"], r["role"], r["name"], r["text"],
            r["created_at"] if "created_at" in cols else 0,
        ))
    _reset_sequence(cur, "chat_history", "id")

    # --- chat_state ---
    rows = src.execute("SELECT * FROM chat_state").fetchall()
    print(f"  chat_state: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO chat_state (chat_id, key, value)
            VALUES (%s, %s, %s)
            ON CONFLICT (chat_id, key) DO UPDATE SET value = EXCLUDED.value
        """, (r["chat_id"], r["key"], r["value"]))

    # --- talk_history ---
    rows = src.execute("SELECT * FROM talk_history").fetchall()
    print(f"  talk_history: {len(rows)} rows")
    cols = rows[0].keys() if rows else []
    for r in rows:
        cur.execute("""
            INSERT INTO talk_history (id, chat_id, user_id, role, name, text, created_at)
            VALUES (%s, %s, %s, %s, %s, %s, %s)
            ON CONFLICT (id) DO NOTHING
        """, (
            r["id"], r["chat_id"], r["user_id"], r["role"], r["name"], r["text"],
            r["created_at"] if "created_at" in cols else 0,
        ))
    _reset_sequence(cur, "talk_history", "id")

    # --- talk_state ---
    rows = src.execute("SELECT * FROM talk_state").fetchall()
    print(f"  talk_state: {len(rows)} rows")
    for r in rows:
        cur.execute("""
            INSERT INTO talk_state (chat_id, user_id, key, value)
            VALUES (%s, %s, %s, %s)
            ON CONFLICT (chat_id, user_id, key) DO UPDATE SET value = EXCLUDED.value
        """, (r["chat_id"], r["user_id"], r["key"], r["value"]))

    src.close()
    pg.commit()
    print("  chat_history.sqlite3 done")


def _reset_sequence(cur, table: str, col: str) -> None:
    """Reset SERIAL sequence to max(col) so future inserts don't collide."""
    cur.execute(f"SELECT setval(pg_get_serial_sequence('{table}', '{col}'), COALESCE(MAX({col}), 1)) FROM {table}")


def main() -> None:
    print(f"Connecting to PostgreSQL: {DATABASE_URL}")
    try:
        pg = psycopg2.connect(DATABASE_URL)
    except psycopg2.OperationalError as e:
        print(f"ERROR: cannot connect to PostgreSQL: {e}", file=sys.stderr)
        sys.exit(1)

    pg.autocommit = False

    print("\n=== economy.sqlite3 ===")
    migrate_economy(pg)

    print("\n=== penis_stats.sqlite3 (legacy) ===")
    migrate_legacy_penis(pg)

    print("\n=== bets.sqlite3 ===")
    migrate_bets(pg)

    print("\n=== chat_history.sqlite3 ===")
    migrate_chat(pg)

    pg.close()
    print("\nMigration complete.")


if __name__ == "__main__":
    main()