// Copyright (C) 2025 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 crate::db::cauldron::pool::{get_token_volume_sats, get_total_volume_sats};
use crate::db::DB;
use crate::rpc::err::{db_error, ApiResult};
use crate::timeutil::time_now;
use rocket::get;
use rocket::serde::json::{json, Json, Value};
use rocket::State;

/// Gives total volume for all tokens in a time period.
/// Status: Stable
///
/// - start: Unix timestamp for start of period (optional, defaults to 24 hours ago)
/// - end: Unix timestamp for end of period (optional, defaults to now)
///
/// **Response Example:**
///
/// ```json
/// {
///     "total_volume_sats": 1459676788,
///     "period_start": 1640995200,
///     "period_end": 1641081600
/// }
/// ```
#[get("/volume?<start>&<end>")]
pub fn volume_all(start: Option<usize>, end: Option<usize>, conn: &State<DB>) -> ApiResult<Value> {
    let db = conn.cauldron_r.get().map_err(db_error)?;

    let end_timestamp = end.unwrap_or_else(|| time_now() as usize);

    let start_timestamp = start.unwrap_or_else(|| {
        end_timestamp.saturating_sub(86400) // 24 hours ago
    });

    let total_volume = get_total_volume_sats(&db, start_timestamp as u64, end_timestamp as u64)
        .map_err(db_error)?;

    Ok(Json(json!({
        "total_volume_sats": total_volume,
        "period_start": start_timestamp,
        "period_end": end_timestamp
    })))
}

/// Gives volume for a specific token in a time period.
/// Status: Stable
///
/// - token: Token identifier / category.
/// - start: Unix timestamp for start of period (optional, defaults to 24 hours ago)
/// - end: Unix timestamp for end of period (optional, defaults to now)
///
/// **Response Example:**
///
/// ```json
/// {
///     "volume_sats": 1459676788,
///     "volume_tokens": 12345,
///     "token_id": "b79bfc8246b5fc4707e7c7dedcb6619ef1ab91f494a790c20b0f4c422ed95b92",
///     "period_start": 1640995200,
///     "period_end": 1641081600
/// }
/// ```
#[get("/volume/<token>?<start>&<end>")]
pub fn volume_token(
    token: &str,
    start: Option<usize>,
    end: Option<usize>,
    conn: &State<DB>,
) -> ApiResult<Value> {
    let db = conn.cauldron_r.get().map_err(db_error)?;

    let end_timestamp = end.unwrap_or_else(|| time_now() as usize);

    let start_timestamp = start.unwrap_or_else(|| {
        end_timestamp.saturating_sub(86400) // 24 hours ago
    });

    let (sats_volume, token_volume) =
        get_token_volume_sats(&db, start_timestamp as u64, end_timestamp as u64, token)
            .map_err(db_error)?;

    Ok(Json(json!({
        "volume_sats": sats_volume,
        "volume_tokens": token_volume,
        "token_id": token,
        "period_start": start_timestamp,
        "period_end": end_timestamp
    })))
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::db::cauldron::pool::{
        create_table, dummy_init_seq, insert_new_pool, insert_pool_history_entry,
    };
    use crate::db::cauldron::tx::{create_table as create_tx_table, insert_block_tx};
    use crate::db::cauldron::utxo_funding::create_table as create_utxo_funding_table;
    use crate::utiltest::mock_db_pool;
    use bitcoin_hashes::hex::ToHex;
    use bitcoin_hashes::Hash;
    use bitcoincash::{BlockHash, PubkeyHash, TokenID, Txid};
    use riftenlabs_defi::cauldron::ParsedContract;
    use riftenlabs_defi::chainutil::OutPointHash;
    use rusqlite::Connection;

    fn setup_mock_db(conn: &Connection) {
        create_tx_table(conn);
        create_table(conn);
        create_utxo_funding_table(conn);
        dummy_init_seq();
    }

    #[test]
    fn test_volume_all() {
        let mock_db = mock_db_pool(setup_mock_db);
        let write_conn = mock_db.cauldron_w.get().unwrap();

        // Insert test data
        let owner_pkh =
            PubkeyHash::from_hash(bitcoin_hashes::hash160::Hash::from_slice(&[0xca; 20]).unwrap());
        let block_zero =
            BlockHash::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0x00; 32]).unwrap());
        let current_time = time_now() as u64;

        // Create test pool and history entries
        let utxo =
            OutPointHash::from_hash(bitcoin_hashes::sha256::Hash::from_slice(&[0xda; 32]).unwrap());
        let token_id =
            TokenID::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0xdb; 32]).unwrap());
        let txid = Txid::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0xdc; 32]).unwrap());

        let cauldron = ParsedContract {
            pkh: owner_pkh,
            is_withdrawn: false,
            spent_utxo_hash: OutPointHash::from_hash(
                bitcoin_hashes::sha256::Hash::from_slice(&[0x00; 32]).unwrap(),
            ),
            new_utxo_hash: Some(utxo),
            new_utxo_txid: Some(txid),
            new_utxo_n: Some(0),
            token_id: Some(token_id),
            sats: Some(1000),
            token_amount: Some(100),
        };

        insert_new_pool(&write_conn, &cauldron).unwrap();
        insert_block_tx(
            &write_conn,
            &txid,
            &block_zero,
            current_time.try_into().unwrap(),
        )
        .unwrap();

        // Insert pool history entry with volume
        insert_pool_history_entry(
            &write_conn,
            &utxo,
            &cauldron,
            Some(current_time),
            Some(current_time),
            500, // sats_delta for trading activity
            50,  // token_delta for trading activity
        )
        .unwrap();

        // Test volume calculation
        let result =
            get_total_volume_sats(&write_conn, current_time - 3600, current_time + 3600).unwrap();
        assert_eq!(result, 500);
    }

    #[test]
    fn test_volume_token() {
        let mock_db = mock_db_pool(setup_mock_db);
        let write_conn = mock_db.cauldron_w.get().unwrap();

        // Insert test data
        let owner_pkh =
            PubkeyHash::from_hash(bitcoin_hashes::hash160::Hash::from_slice(&[0xca; 20]).unwrap());
        let block_zero =
            BlockHash::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0x00; 32]).unwrap());
        let current_time = time_now() as u64;

        // Create test pool and history entries
        let utxo =
            OutPointHash::from_hash(bitcoin_hashes::sha256::Hash::from_slice(&[0xda; 32]).unwrap());
        let token_id =
            TokenID::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0xdb; 32]).unwrap());
        let txid = Txid::from_hash(bitcoin_hashes::sha256d::Hash::from_slice(&[0xdc; 32]).unwrap());

        let cauldron = ParsedContract {
            pkh: owner_pkh,
            is_withdrawn: false,
            spent_utxo_hash: OutPointHash::from_hash(
                bitcoin_hashes::sha256::Hash::from_slice(&[0x00; 32]).unwrap(),
            ),
            new_utxo_hash: Some(utxo),
            new_utxo_txid: Some(txid),
            new_utxo_n: Some(0),
            token_id: Some(token_id),
            sats: Some(1000),
            token_amount: Some(100),
        };

        insert_new_pool(&write_conn, &cauldron).unwrap();
        insert_block_tx(
            &write_conn,
            &txid,
            &block_zero,
            current_time.try_into().unwrap(),
        )
        .unwrap();

        // Insert pool history entry with volume
        insert_pool_history_entry(
            &write_conn,
            &utxo,
            &cauldron,
            Some(current_time),
            Some(current_time),
            500, // sats_delta for trading activity
            50,  // token_delta for trading activity
        )
        .unwrap();

        // Test token-specific volume calculation
        let (sats_volume, token_volume) = get_token_volume_sats(
            &write_conn,
            current_time - 3600,
            current_time + 3600,
            &token_id.to_hex(),
        )
        .unwrap();
        assert_eq!(sats_volume, 500);
        assert_eq!(token_volume, 50);
    }
}