// Copyright (C) 2024 Riften Labs AS
//
// This software is licensed under the GNU Affero General Public License (AGPL), version 3.0 or later.
// A copy of the license can be found in the LICENSE file or at https://www.gnu.org/licenses/agpl-3.0.html

use std::sync::Arc;

use anyhow::Result;
use bitcoin_hashes::hex::ToHex;
use bitcoincash::BlockHash;
use rusqlite::{params, Connection};

pub mod config;
pub mod header;
pub mod mempool;
pub mod pool;
pub mod tx;
pub mod utxo_funding;
pub mod utxo_spending;

pub type DBPool = Arc<r2d2::Pool<r2d2_sqlite::SqliteConnectionManager>>;

pub fn prepare_tables(conn: &Connection) {
    tx::create_table(conn);
    utxo_funding::create_table(conn);
    utxo_spending::create_table(conn);

    conn.execute(
        "CREATE TABLE config (
        key TEXT PRIMARY KEY,
        value TEXT
    )",
        [],
    )
    .unwrap();

    conn.execute(
        "CREATE TABLE headers (
            key TEXT PRIMARY KEY,
            height INT,
            header BLOB
        )",
        [],
    )
    .unwrap();

    // Keep track of what was the initial deployment of a Cauldron
    pool::create_table(conn);
    // Indexes for list_by_volume
    conn.execute(
        "CREATE INDEX idx_utxo_funding_join ON utxo_funding(new_utxo_hash, sats, token_id);",
        [],
    )
    .unwrap();
    conn.execute("CREATE INDEX idx_utxo_funding_tvl_highest ON utxo_funding(token_id, new_utxo_hash, sats, token_amount);", []).unwrap();
}

pub fn delete_entries_for_block(tx: &Connection, blockhash: &BlockHash) -> Result<bool> {
    let mut stmt = tx.prepare(
        "DELETE FROM utxo_funding
    WHERE txid IN (
        SELECT txid FROM tx WHERE blockhash = ?
    )",
    )?;
    let mut rows_deleted = stmt.execute(params![blockhash.to_hex()])?;

    let mut stmt = tx.prepare(
        "DELETE FROM utxo_spending
    WHERE txid IN (
        SELECT txid FROM utxo_funding WHERE txid IN (
            SELECT txid FROM tx WHERE blockhash = ?
        )
    )",
    )?;
    rows_deleted += stmt.execute(params![blockhash.to_hex()])?;

    // remaining tables should clear themselves due to foregn keys usage

    Ok(rows_deleted != 0)
}