// Copyright 2022 IOTA Stiftung
// SPDX-License-Identifier: Apache-2.0

//! In this example we will create an alias output.
//!
//! Rename `.env.example` to `.env` first, then run the command:
//! ```sh
//! cargo run --release --example alias [ALIAS AMOUNT]
//! ```

use iota_sdk::{
    client::{api::GetAddressesOptions, request_funds_from_faucet, secret::SecretManager, Client, Result},
    types::block::{
        output::{
            feature::{IssuerFeature, MetadataFeature, SenderFeature},
            unlock_condition::{GovernorAddressUnlockCondition, StateControllerAddressUnlockCondition},
            AliasId, AliasOutputBuilder, Output, OutputId,
        },
        payload::Payload,
    },
};

#[tokio::main]
async fn main() -> Result<()> {
    // This example uses secrets in environment variables for simplicity which should not be done in production.
    // Configure your own mnemonic in the ".env" file. Since the output amount cannot be zero, the seed must contain
    // non-zero balance.
    dotenvy::dotenv().ok();

    for var in ["NODE_URL", "MNEMONIC", "FAUCET_URL", "EXPLORER_URL"] {
        std::env::var(var).expect(&format!(".env variable '{var}' is undefined, see .env.example"));
    }

    // Create a node client.
    let client = Client::builder()
        .with_node(&std::env::var("NODE_URL").unwrap())?
        .finish()
        .await?;

    let secret_manager = SecretManager::try_from_mnemonic(std::env::var("MNEMONIC").unwrap())?;

    let token_supply = client.get_token_supply().await?;

    let address = secret_manager
        .generate_ed25519_addresses(GetAddressesOptions::from_client(&client).await?.with_range(0..1))
        .await?[0];

    println!(
        "Requesting funds (waiting 15s): {}",
        request_funds_from_faucet(&std::env::var("FAUCET_URL").unwrap(), &address).await?,
    );
    tokio::time::sleep(std::time::Duration::from_secs(15)).await;

    //////////////////////////////////
    // create new alias output
    //////////////////////////////////
    let alias_amount = std::env::args()
        .nth(1)
        .map(|s| s.parse::<u64>().unwrap())
        .unwrap_or(1_000_000u64);
    let alias_output_builder = AliasOutputBuilder::new_with_amount(alias_amount, AliasId::null())
        .add_feature(SenderFeature::new(address))
        .add_feature(MetadataFeature::new([1, 2, 3])?)
        .add_immutable_feature(IssuerFeature::new(address))
        .add_unlock_condition(StateControllerAddressUnlockCondition::new(address))
        .add_unlock_condition(GovernorAddressUnlockCondition::new(address));

    let outputs = [alias_output_builder.clone().finish_output(token_supply)?];

    let block = client
        .build_block()
        .with_secret_manager(&secret_manager)
        .with_outputs(outputs)?
        .finish()
        .await?;

    println!(
        "Transaction with new alias output sent: {}/block/{}",
        std::env::var("EXPLORER_URL").unwrap(),
        block.id()
    );
    let _ = client.retry_until_included(&block.id(), None, None).await?;

    //////////////////////////////////
    // create second transaction with the actual AliasId (BLAKE2b-256 hash of the Output ID that created the alias)
    //////////////////////////////////
    let alias_output_id = get_alias_output_id(block.payload().unwrap())?;
    let alias_id = AliasId::from(&alias_output_id);
    let outputs = [alias_output_builder
        .with_alias_id(alias_id)
        .with_state_index(1)
        .finish_output(token_supply)?];

    let block = client
        .build_block()
        .with_secret_manager(&secret_manager)
        .with_input(alias_output_id.into())?
        .with_outputs(outputs)?
        .finish()
        .await?;

    println!(
        "Block with alias id set sent: {}/block/{}",
        std::env::var("EXPLORER_URL").unwrap(),
        block.id()
    );
    let _ = client.retry_until_included(&block.id(), None, None).await?;
    Ok(())
}

// helper function to get the output id for the first alias output
fn get_alias_output_id(payload: &Payload) -> Result<OutputId> {
    match payload {
        Payload::Transaction(tx_payload) => {
            for (index, output) in tx_payload.essence().as_regular().outputs().iter().enumerate() {
                if let Output::Alias(_alias_output) = output {
                    return Ok(OutputId::new(tx_payload.id(), index.try_into().unwrap())?);
                }
            }
            panic!("No alias output in transaction essence")
        }
        _ => panic!("No tx payload"),
    }
}