use {
    solana_program::{
        account_info::{next_account_info, AccountInfo},
        entrypoint::ProgramResult, 
        msg, 
        program::invoke,
    },
    spl_token::{
        instruction as token_instruction,
    },
    spl_associated_token_account::{
        instruction as associated_token_account_instruction,
    },
    mpl_token_metadata::{
        instruction as mpl_instruction,
    },
};


pub fn mint_to(
    accounts: &[AccountInfo],
) -> ProgramResult {

    let accounts_iter = &mut accounts.iter();

    let mint_account = next_account_info(accounts_iter)?;
    let metadata_account = next_account_info(accounts_iter)?;
    let edition_account = next_account_info(accounts_iter)?;
    let mint_authority = next_account_info(accounts_iter)?;
    let associated_token_account = next_account_info(accounts_iter)?;
    let payer = next_account_info(accounts_iter)?;
    let rent = next_account_info(accounts_iter)?;
    let _system_program = next_account_info(accounts_iter)?;
    let token_program = next_account_info(accounts_iter)?;
    let associated_token_program = next_account_info(accounts_iter)?;
    let token_metadata_program = next_account_info(accounts_iter)?;

    if associated_token_account.lamports() == 0 {
        msg!("Creating associated token account...");
        invoke(
            &associated_token_account_instruction::create_associated_token_account(
                &payer.key,
                &payer.key,
                &mint_account.key,
            ),
            &[
                mint_account.clone(),
                associated_token_account.clone(),
                payer.clone(),
                token_program.clone(),
                associated_token_program.clone(),
            ]
        )?;
    } else {
        msg!("Associated token account exists.");
    }
    msg!("Associated Token Address: {}", associated_token_account.key);

    // Mint the NFT to the user's wallet
    //
    msg!("Minting NFT to associated token account...");
    invoke(
        &token_instruction::mint_to(
            &token_program.key,
            &mint_account.key,
            &associated_token_account.key,
            &mint_authority.key,
            &[&mint_authority.key],
            1,
        )?,
        &[
            mint_account.clone(),
            mint_authority.clone(),
            associated_token_account.clone(),
            token_program.clone(),
        ],
    )?;

    // We can make this a Limited Edition NFT through Metaplex,
    //      which will disable minting by setting the Mint & Freeze Authorities to the
    //      Edition Account.
    //
    msg!("Creating edition account...");
    msg!("Edition account address: {}", edition_account.key);
    invoke(
        &mpl_instruction::create_master_edition_v3(
            *token_metadata_program.key,        // Program ID
            *edition_account.key,               // Edition
            *mint_account.key,                  // Mint
            *mint_authority.key,                // Update Authority
            *mint_authority.key,                // Mint Authority
            *metadata_account.key,              // Metadata
            *payer.key,                         // Payer
            Some(1),                            // Max Supply
        ),
        &[
            edition_account.clone(),
            metadata_account.clone(),
            mint_account.clone(),
            mint_authority.clone(),
            payer.clone(),
            token_metadata_program.clone(),
            rent.clone(),
        ]
    )?;

    // If we don't use Metaplex Editions, we must disable minting manually
    //
    // -------------------------------------------------------------------
    // msg!("Disabling future minting of this NFT...");
    // invoke(
    //     &token_instruction::set_authority(
    //         &token_program.key, 
    //         &mint_account.key, 
    //         None, 
    //         token_instruction::AuthorityType::MintTokens, 
    //         &mint_authority.key,
    //         &[&mint_authority.key],
    //     )?,
    //     &[
    //         mint_account.clone(),
    //         mint_authority.clone(),
    //         token_program.clone(),
    //     ],
    // )?;
    // invoke(
    //     &token_instruction::set_authority(
    //         &token_program.key, 
    //         &mint_account.key, 
    //         None, 
    //         token_instruction::AuthorityType::FreezeAccount, 
    //         &mint_authority.key,
    //         &[&mint_authority.key],
    //     )?,
    //     &[
    //         mint_account.clone(),
    //         mint_authority.clone(),
    //         token_program.clone(),
    //     ],
    // )?;

    msg!("NFT minted successfully.");

    Ok(())
}