/* This file is part of DarkFi (https://dark.fi)
 *
 * Copyright (C) 2020-2024 Dyne.org foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use std::{fs, sync::Arc};

use url::Url;

use darkfi::{rpc::client::RpcClient, util::path::expand_path, Error, Result};

/// Error codes
pub mod error;
use error::{WalletDbError, WalletDbResult};

/// darkfid JSON-RPC related methods
pub mod rpc;

/// Payment methods
pub mod transfer;

/// Swap methods
pub mod swap;

/// Token methods
pub mod token;

/// CLI utility functions
pub mod cli_util;

/// Wallet functionality related to Money
pub mod money;

/// Wallet functionality related to Dao
pub mod dao;

/// Wallet functionality related to Deployooor
pub mod deploy;

/// Wallet functionality related to transactions history
pub mod txs_history;

/// Wallet functionality related to scanned blocks
pub mod scanned_blocks;

/// Wallet database operations handler
pub mod walletdb;
use walletdb::{WalletDb, WalletPtr};

/// CLI-util structure
pub struct Drk {
    /// Wallet database operations handler
    pub wallet: WalletPtr,
    /// JSON-RPC client to execute requests to darkfid daemon
    pub rpc_client: Option<RpcClient>,
    /// Flag indicating if fun stuff are enabled
    pub fun: bool,
}

impl Drk {
    pub async fn new(
        wallet_path: String,
        wallet_pass: String,
        endpoint: Option<Url>,
        ex: Arc<smol::Executor<'static>>,
        fun: bool,
    ) -> Result<Self> {
        // Initialize wallet
        let wallet_path = expand_path(&wallet_path)?;
        if !wallet_path.exists() {
            if let Some(parent) = wallet_path.parent() {
                fs::create_dir_all(parent)?;
            }
        }
        let Ok(wallet) = WalletDb::new(Some(wallet_path), Some(&wallet_pass)) else {
            return Err(Error::DatabaseError(format!("{}", WalletDbError::InitializationFailed)));
        };

        // Initialize rpc client
        let rpc_client = if let Some(endpoint) = endpoint {
            Some(RpcClient::new(endpoint, ex).await?)
        } else {
            None
        };

        Ok(Self { wallet, rpc_client, fun })
    }

    /// Initialize wallet with tables for `Drk`.
    pub async fn initialize_wallet(&self) -> WalletDbResult<()> {
        // Initialize wallet schema
        self.wallet.exec_batch_sql(include_str!("../wallet.sql"))?;

        Ok(())
    }

    /// Auxiliary function to completely reset wallet state.
    pub async fn reset(&self) -> WalletDbResult<()> {
        println!("Resetting full wallet state");
        self.reset_scanned_blocks()?;
        self.reset_money_tree().await?;
        self.reset_money_smt()?;
        self.reset_money_coins()?;
        self.reset_mint_authorities()?;
        self.reset_dao_trees().await?;
        self.reset_daos().await?;
        self.reset_dao_proposals().await?;
        self.reset_dao_votes()?;
        self.reset_tx_history()?;
        println!("Successfully reset full wallet state");
        Ok(())
    }

    /// Auxiliary function to reset `walletdb` inverse cache state.
    /// Additionally, set current trees state inverse queries.
    /// We keep the entire trees state as two distinct inverse queries,
    /// since we execute per transaction call, so we don't have to update
    /// them on each iteration.
    pub async fn reset_inverse_cache(&self) -> Result<()> {
        // Reset `walletdb` inverse cache
        if let Err(e) = self.wallet.clear_inverse_cache() {
            return Err(Error::DatabaseError(format!(
                "[reset_inverse_cache] Clearing wallet inverse cache failed: {e:?}"
            )))
        }

        // Grab current money tree state query and insert it into inverse cache
        let query = self.get_money_tree_state_query().await?;
        if let Err(e) = self.wallet.cache_inverse(query) {
            return Err(Error::DatabaseError(format!(
                "[reset_inverse_cache] Inserting money query into inverse cache failed: {e:?}"
            )))
        }

        // Grab current DAO trees state query and insert it into inverse cache
        let query = self.get_dao_trees_state_query().await?;
        if let Err(e) = self.wallet.cache_inverse(query) {
            return Err(Error::DatabaseError(format!(
                "[reset_inverse_cache] Inserting DAO query into inverse cache failed: {e:?}"
            )))
        }

        Ok(())
    }

    /// Auxiliary function to store current `walletdb` inverse cache
    /// in scanned blocks information for provided block height and hash.
    /// Additionally, clear `walletdb` inverse cache state.
    pub fn store_inverse_cache(&self, height: u32, hash: &str) -> Result<()> {
        // Grab current inverse state rollback query
        let rollback_query = match self.wallet.grab_inverse_cache_block() {
            Ok(q) => q,
            Err(e) => {
                return Err(Error::DatabaseError(format!(
                    "[store_inverse_cache] Creating rollback query failed: {e:?}"
                )))
            }
        };

        // Store it as a scanned blocks information record
        if let Err(e) = self.put_scanned_block_record(height, hash, &rollback_query) {
            return Err(Error::DatabaseError(format!(
                "[store_inverse_cache] Inserting scanned blocks information record failed: {e:?}"
            )))
        };

        // Reset `walletdb` inverse cache
        if let Err(e) = self.wallet.clear_inverse_cache() {
            return Err(Error::DatabaseError(format!(
                "[store_inverse_cache] Clearing wallet inverse cache failed: {e:?}"
            )))
        };

        Ok(())
    }
}