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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
// This file is part of Frontier.
//
// Copyright (c) 2021-2022 Parity Technologies (UK) Ltd.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.

mod mapping_db;
mod meta_db;
//#[cfg(test)]
//mod tests;
pub(crate) mod utils;

use std::{path::PathBuf, str::FromStr, sync::Arc};

use clap::ValueEnum;
use ethereum_types::H256;
use serde::Deserialize;
// Substrate
use sc_cli::{PruningParams, SharedParams};
use sp_api::ProvideRuntimeApi;
use sp_blockchain::HeaderBackend;
use sp_runtime::traits::Block as BlockT;

use self::{
    mapping_db::{MappingDb, MappingKey, MappingValue},
    meta_db::{MetaDb, MetaKey, MetaValue},
};

/// Cli tool to interact with the Frontier backend db
#[derive(Debug, Clone, clap::Parser)]
pub struct FrontierDbCmd {
    /// Specify the operation to perform.
    ///
    /// Can be one of `create | read | update | delete`.
    #[arg(value_enum, ignore_case = true, required = true)]
    pub operation: Operation,

    /// Specify the column to query.
    ///
    /// Can be one of `meta | block | transaction`.
    #[arg(value_enum, ignore_case = true, required = true)]
    pub column: Column,

    /// Specify the key to either read or write.
    #[arg(short('k'), long, required = true)]
    pub key: String,

    /// Specify the value to write.
    ///
    /// - When `Some`, path to file.
    /// - When `None`, read from stdin.
    ///
    /// In any case, payload must be serializable to a known type.
    #[arg(long)]
    pub value: Option<PathBuf>,

    /// Shared parameters
    #[command(flatten)]
    pub shared_params: SharedParams,

    #[allow(missing_docs)]
    #[command(flatten)]
    pub pruning_params: PruningParams,
}

#[derive(ValueEnum, Debug, Clone)]
pub enum Operation {
    Create,
    Read,
    Update,
    Delete,
}

#[derive(ValueEnum, Debug, Clone)]
pub enum Column {
    Meta,
    Block,
    Transaction,
}

#[derive(Debug, Deserialize)]
#[serde(untagged)]
pub enum DbValue<H> {
    Meta(MetaValue<H>),
    Mapping(MappingValue<H>),
}

impl FrontierDbCmd {
    pub fn run<C, B: BlockT>(
        &self,
        client: Arc<C>,
        backend: Arc<fc_db::kv::Backend<B>>,
    ) -> sc_cli::Result<()>
    where
        C: ProvideRuntimeApi<B>,
        C::Api: fp_rpc::EthereumRuntimeRPCApi<B>,
        C: HeaderBackend<B>,
    {
        match self.column {
            Column::Meta => {
                // New meta db handler
                let meta_db = MetaDb::new(self, backend);
                // Maybe get a MetaKey
                let key = MetaKey::from_str(&self.key)?;
                // Maybe get a MetaValue
                let value = match utils::maybe_deserialize_value::<B>(
                    &self.operation,
                    self.value.as_ref(),
                )? {
                    Some(DbValue::Meta(value)) => Some(value),
                    None => None,
                    _ => return Err(format!("Unexpected `{:?}` value", self.value).into()),
                };
                // Run the query
                meta_db.query(&key, &value)?
            },
            Column::Block | Column::Transaction => {
                // New mapping db handler
                let mapping_db = MappingDb::new(self, client, backend);
                // Maybe get a MappingKey
                let key = MappingKey::EthBlockOrTransactionHash(
                    H256::from_str(&self.key).expect("H256 provided key"),
                );
                // Maybe get a MappingValue
                let value = match utils::maybe_deserialize_value::<B>(
                    &self.operation,
                    self.value.as_ref(),
                )? {
                    Some(DbValue::Mapping(value)) => Some(value),
                    None => None,
                    _ => return Err(format!("Unexpected `{:?}` value", self.value).into()),
                };
                // Run the query
                mapping_db.query(&self.column, &key, &value)?
            },
        }
        Ok(())
    }
}

impl sc_cli::CliConfiguration for FrontierDbCmd {
    fn shared_params(&self) -> &SharedParams {
        &self.shared_params
    }

    fn pruning_params(&self) -> Option<&PruningParams> {
        Some(&self.pruning_params)
    }
}