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use {
    crate::parse_token::UiAccountState,
    spl_token_2022::{
        extension::{self, BaseState, ExtensionType, StateWithExtensions},
        solana_program::pubkey::Pubkey,
    },
};

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase", tag = "extension", content = "state")]
pub enum UiExtension {
    Uninitialized,
    TransferFeeConfig(UiTransferFeeConfig),
    TransferFeeAmount(UiTransferFeeAmount),
    MintCloseAuthority(UiMintCloseAuthority),
    ConfidentialTransferMint,    // Implementation of extension state to come
    ConfidentialTransferAccount, // Implementation of extension state to come
    DefaultAccountState(UiDefaultAccountState),
    ImmutableOwner,
    MemoTransfer(UiMemoTransfer),
    UnparseableExtension,
}

pub fn parse_extension<S: BaseState>(
    extension_type: &ExtensionType,
    account: &StateWithExtensions<S>,
) -> UiExtension {
    match &extension_type {
        ExtensionType::Uninitialized => UiExtension::Uninitialized,
        ExtensionType::TransferFeeConfig => account
            .get_extension::<extension::transfer_fee::TransferFeeConfig>()
            .map(|&extension| UiExtension::TransferFeeConfig(extension.into()))
            .unwrap_or(UiExtension::UnparseableExtension),
        ExtensionType::TransferFeeAmount => account
            .get_extension::<extension::transfer_fee::TransferFeeAmount>()
            .map(|&extension| UiExtension::TransferFeeAmount(extension.into()))
            .unwrap_or(UiExtension::UnparseableExtension),
        ExtensionType::MintCloseAuthority => account
            .get_extension::<extension::mint_close_authority::MintCloseAuthority>()
            .map(|&extension| UiExtension::MintCloseAuthority(extension.into()))
            .unwrap_or(UiExtension::UnparseableExtension),
        ExtensionType::ConfidentialTransferMint => UiExtension::ConfidentialTransferMint,
        ExtensionType::ConfidentialTransferAccount => UiExtension::ConfidentialTransferAccount,
        ExtensionType::DefaultAccountState => account
            .get_extension::<extension::default_account_state::DefaultAccountState>()
            .map(|&extension| UiExtension::DefaultAccountState(extension.into()))
            .unwrap_or(UiExtension::UnparseableExtension),
        ExtensionType::ImmutableOwner => UiExtension::ImmutableOwner,
        ExtensionType::MemoTransfer => account
            .get_extension::<extension::memo_transfer::MemoTransfer>()
            .map(|&extension| UiExtension::MemoTransfer(extension.into()))
            .unwrap_or(UiExtension::UnparseableExtension),
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiTransferFee {
    pub epoch: u64,
    pub maximum_fee: u64,
    pub transfer_fee_basis_points: u16,
}

impl From<extension::transfer_fee::TransferFee> for UiTransferFee {
    fn from(transfer_fee: extension::transfer_fee::TransferFee) -> Self {
        Self {
            epoch: u64::from(transfer_fee.epoch),
            maximum_fee: u64::from(transfer_fee.maximum_fee),
            transfer_fee_basis_points: u16::from(transfer_fee.transfer_fee_basis_points),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiTransferFeeConfig {
    pub transfer_fee_config_authority: Option<String>,
    pub withdraw_withheld_authority: Option<String>,
    pub withheld_amount: u64,
    pub older_transfer_fee: UiTransferFee,
    pub newer_transfer_fee: UiTransferFee,
}

impl From<extension::transfer_fee::TransferFeeConfig> for UiTransferFeeConfig {
    fn from(transfer_fee_config: extension::transfer_fee::TransferFeeConfig) -> Self {
        let transfer_fee_config_authority: Option<Pubkey> =
            transfer_fee_config.transfer_fee_config_authority.into();
        let withdraw_withheld_authority: Option<Pubkey> =
            transfer_fee_config.withdraw_withheld_authority.into();

        Self {
            transfer_fee_config_authority: transfer_fee_config_authority
                .map(|pubkey| pubkey.to_string()),
            withdraw_withheld_authority: withdraw_withheld_authority
                .map(|pubkey| pubkey.to_string()),
            withheld_amount: u64::from(transfer_fee_config.withheld_amount),
            older_transfer_fee: transfer_fee_config.older_transfer_fee.into(),
            newer_transfer_fee: transfer_fee_config.newer_transfer_fee.into(),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiTransferFeeAmount {
    pub withheld_amount: u64,
}

impl From<extension::transfer_fee::TransferFeeAmount> for UiTransferFeeAmount {
    fn from(transfer_fee_amount: extension::transfer_fee::TransferFeeAmount) -> Self {
        Self {
            withheld_amount: u64::from(transfer_fee_amount.withheld_amount),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiMintCloseAuthority {
    pub close_authority: Option<String>,
}

impl From<extension::mint_close_authority::MintCloseAuthority> for UiMintCloseAuthority {
    fn from(mint_close_authority: extension::mint_close_authority::MintCloseAuthority) -> Self {
        let authority: Option<Pubkey> = mint_close_authority.close_authority.into();
        Self {
            close_authority: authority.map(|pubkey| pubkey.to_string()),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiDefaultAccountState {
    pub account_state: UiAccountState,
}

impl From<extension::default_account_state::DefaultAccountState> for UiDefaultAccountState {
    fn from(default_account_state: extension::default_account_state::DefaultAccountState) -> Self {
        let account_state =
            spl_token_2022::state::AccountState::try_from(default_account_state.state)
                .unwrap_or_default();
        Self {
            account_state: account_state.into(),
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiMemoTransfer {
    pub require_incoming_transfer_memos: bool,
}

impl From<extension::memo_transfer::MemoTransfer> for UiMemoTransfer {
    fn from(memo_transfer: extension::memo_transfer::MemoTransfer) -> Self {
        Self {
            require_incoming_transfer_memos: memo_transfer.require_incoming_transfer_memos.into(),
        }
    }
}