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use {
    crate::{state::*, errors::ErrorCode},
    anchor_lang::{prelude::*}
};
use spl_token::instruction::AuthorityType;
use anchor_spl::{
    token::{self, Token, Mint, SetAuthority},
};

#[derive(Accounts)]
pub struct CloseMintManagerCtx<'info> {
    #[account(constraint = mint_manager.token_managers == 0 @ ErrorCode::OutstandingTokens)]
    pub mint_manager: Account<'info, MintManager>, 
    #[account(mut, 
        constraint = mint.freeze_authority.unwrap() == mint_manager.key() @ ErrorCode::InvalidFreezeAuthority,
        close = freeze_authority,
    )]
    pub mint: Account<'info, Mint>,
    #[account(constraint = mint_manager.initializer == freeze_authority.key() @ ErrorCode::InvalidFreezeAuthority)]
    pub freeze_authority: Signer<'info>,
    pub payer: Signer<'info>,
    pub token_program: Program<'info, Token>,
}

pub fn handler(ctx: Context<CloseMintManagerCtx>) -> Result<()> {
    // get PDA seeds to sign with
    let mint = ctx.accounts.mint.key();
    let mint_manager_seeds = &[MINT_MANAGER_SEED.as_bytes(), mint.as_ref(), &[ctx.accounts.mint_manager.bump]];
    let mint_manager_signer = &[&mint_manager_seeds[..]];

    // set freeze authority of mint back to original
    let cpi_accounts = SetAuthority {
        account_or_mint: ctx.accounts.freeze_authority.to_account_info(),
        current_authority: ctx.accounts.mint_manager.to_account_info(),
    };
    let cpi_program = ctx.accounts.token_program.to_account_info();
    let cpi_context = CpiContext::new(cpi_program, cpi_accounts).with_signer(mint_manager_signer);
    token::set_authority(cpi_context, AuthorityType::FreezeAccount, Some(ctx.accounts.freeze_authority.key()))?;
    return Ok(())
}