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use crate::{parse_account_data::ParseAccountError, StringAmount};
use solana_sdk::{
    clock::{Epoch, Slot},
    pubkey::Pubkey,
};
use solana_vote_program::vote_state::{BlockTimestamp, Lockout, VoteState};

pub fn parse_vote(data: &[u8]) -> Result<VoteAccountType, ParseAccountError> {
    let mut vote_state = VoteState::deserialize(data).map_err(ParseAccountError::from)?;
    let epoch_credits = vote_state
        .epoch_credits()
        .iter()
        .map(|(epoch, credits, previous_credits)| UiEpochCredits {
            epoch: *epoch,
            credits: credits.to_string(),
            previous_credits: previous_credits.to_string(),
        })
        .collect();
    let votes = vote_state
        .votes
        .iter()
        .map(|lockout| UiLockout {
            slot: lockout.slot,
            confirmation_count: lockout.confirmation_count,
        })
        .collect();
    let authorized_voters = vote_state
        .authorized_voters()
        .iter()
        .map(|(epoch, authorized_voter)| UiAuthorizedVoters {
            epoch: *epoch,
            authorized_voter: authorized_voter.to_string(),
        })
        .collect();
    let prior_voters = vote_state
        .prior_voters()
        .buf()
        .iter()
        .filter(|(pubkey, _, _)| pubkey != &Pubkey::default())
        .map(
            |(authorized_pubkey, epoch_of_last_authorized_switch, target_epoch)| UiPriorVoters {
                authorized_pubkey: authorized_pubkey.to_string(),
                epoch_of_last_authorized_switch: *epoch_of_last_authorized_switch,
                target_epoch: *target_epoch,
            },
        )
        .collect();
    Ok(VoteAccountType::Vote(UiVoteState {
        node_pubkey: vote_state.node_pubkey.to_string(),
        authorized_withdrawer: vote_state.authorized_withdrawer.to_string(),
        commission: vote_state.commission,
        votes,
        root_slot: vote_state.root_slot,
        authorized_voters,
        prior_voters,
        epoch_credits,
        last_timestamp: vote_state.last_timestamp,
    }))
}

/// A wrapper enum for consistency across programs
#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase", tag = "type", content = "info")]
pub enum VoteAccountType {
    Vote(UiVoteState),
}

/// A duplicate representation of VoteState for pretty JSON serialization
#[derive(Debug, Serialize, Deserialize, Default, PartialEq)]
#[serde(rename_all = "camelCase")]
pub struct UiVoteState {
    node_pubkey: String,
    authorized_withdrawer: String,
    commission: u8,
    votes: Vec<UiLockout>,
    root_slot: Option<Slot>,
    authorized_voters: Vec<UiAuthorizedVoters>,
    prior_voters: Vec<UiPriorVoters>,
    epoch_credits: Vec<UiEpochCredits>,
    last_timestamp: BlockTimestamp,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
struct UiLockout {
    slot: Slot,
    confirmation_count: u32,
}

impl From<&Lockout> for UiLockout {
    fn from(lockout: &Lockout) -> Self {
        Self {
            slot: lockout.slot,
            confirmation_count: lockout.confirmation_count,
        }
    }
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
struct UiAuthorizedVoters {
    epoch: Epoch,
    authorized_voter: String,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
struct UiPriorVoters {
    authorized_pubkey: String,
    epoch_of_last_authorized_switch: Epoch,
    target_epoch: Epoch,
}

#[derive(Debug, Serialize, Deserialize, PartialEq)]
#[serde(rename_all = "camelCase")]
struct UiEpochCredits {
    epoch: Epoch,
    credits: StringAmount,
    previous_credits: StringAmount,
}

#[cfg(test)]
mod test {
    use super::*;
    use solana_vote_program::vote_state::VoteStateVersions;

    #[test]
    fn test_parse_vote() {
        let vote_state = VoteState::default();
        let mut vote_account_data: Vec<u8> = vec![0; VoteState::size_of()];
        let versioned = VoteStateVersions::new_current(vote_state);
        VoteState::serialize(&versioned, &mut vote_account_data).unwrap();
        let expected_vote_state = UiVoteState {
            node_pubkey: Pubkey::default().to_string(),
            authorized_withdrawer: Pubkey::default().to_string(),
            ..UiVoteState::default()
        };
        assert_eq!(
            parse_vote(&vote_account_data).unwrap(),
            VoteAccountType::Vote(expected_vote_state)
        );

        let bad_data = vec![0; 4];
        assert!(parse_vote(&bad_data).is_err());
    }
}