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use crate::{
    block::{self, Block},
    chaintypes::ChainLength,
    date::BlockDate,
    fragment::{Contents, ContentsBuilder, Fragment},
    header::{BlockVersion, Header},
    key::Hash,
    testing::data::LeaderPair,
    testing::{data::StakePool, TestGen},
};
use chain_time::TimeEra;

pub struct GenesisPraosBlockBuilder {
    date: Option<BlockDate>,
    chain_length: Option<ChainLength>,
    parent_id: Option<Hash>,
    contents_builder: ContentsBuilder,
}

impl Default for GenesisPraosBlockBuilder {
    fn default() -> Self {
        Self::new()
    }
}

impl GenesisPraosBlockBuilder {
    pub fn new() -> Self {
        GenesisPraosBlockBuilder {
            date: None,
            chain_length: None,
            parent_id: None,
            contents_builder: ContentsBuilder::new(),
        }
    }

    pub fn with_parent(&mut self, parent: &Header) -> &mut Self {
        self.with_parent_id(parent.hash());
        self.with_date(parent.block_date());
        self.with_chain_length(parent.chain_length());
        self
    }

    pub fn with_parent_id(&mut self, parent_id: Hash) -> &mut Self {
        self.parent_id = Some(parent_id);
        self
    }

    pub fn with_date(&mut self, date: BlockDate) -> &mut Self {
        self.date = Some(date);
        self
    }

    pub fn with_chain_length(&mut self, chain_length: ChainLength) -> &mut Self {
        self.chain_length = Some(chain_length);
        self
    }

    pub fn with_fragment(&mut self, fragment: Fragment) -> &mut Self {
        self.contents_builder.push(fragment);
        self
    }

    pub fn with_fragments(&mut self, fragments: Vec<Fragment>) -> &mut Self {
        for fragment in fragments {
            self.with_fragment(fragment);
        }
        self
    }

    pub fn build(&self, stake_pool: &StakePool, time_era: &TimeEra) -> Block {
        if self.date.is_none() || self.chain_length.is_none() || self.parent_id.is_none() {
            panic!("date,chain_length or hash is not set");
        }
        let vrf_proof = TestGen::vrf_proof(stake_pool);
        let contents: Contents = self.contents_builder.clone().into();
        block::builder(BlockVersion::KesVrfproof, contents, |builder| {
            Ok::<_, ()>(
                builder
                    .set_parent(
                        &self.parent_id.unwrap(),
                        self.chain_length.unwrap().increase(),
                    )
                    .set_date(self.date.unwrap().next(time_era))
                    .into_genesis_praos_builder()
                    .unwrap()
                    .set_consensus_data(&stake_pool.id(), &vrf_proof)
                    .sign_using(stake_pool.kes().private_key())
                    .generalize(),
            )
        })
        .unwrap()
    }
}

pub struct BftBlockBuilder {
    date: Option<BlockDate>,
    chain_length: Option<ChainLength>,
    parent_id: Option<Hash>,
    contents_builder: ContentsBuilder,
}

impl Default for BftBlockBuilder {
    fn default() -> Self {
        Self::new()
    }
}

impl BftBlockBuilder {
    pub fn new() -> Self {
        Self {
            date: None,
            chain_length: None,
            parent_id: None,
            contents_builder: ContentsBuilder::new(),
        }
    }

    pub fn with_parent(&mut self, parent: &Header) -> &mut Self {
        self.with_parent_id(parent.hash());
        self.with_date(parent.block_date());
        self.with_chain_length(parent.chain_length());
        self
    }

    pub fn with_parent_id(&mut self, parent_id: Hash) -> &mut Self {
        self.parent_id = Some(parent_id);
        self
    }

    pub fn with_date(&mut self, date: BlockDate) -> &mut Self {
        self.date = Some(date);
        self
    }

    pub fn with_chain_length(&mut self, chain_length: ChainLength) -> &mut Self {
        self.chain_length = Some(chain_length);
        self
    }

    pub fn with_fragment(&mut self, fragment: Fragment) -> &mut Self {
        self.contents_builder.push(fragment);
        self
    }

    pub fn with_fragments(&mut self, fragments: Vec<Fragment>) -> &mut Self {
        for fragment in fragments {
            self.with_fragment(fragment);
        }
        self
    }

    pub fn build(&self, leader: &LeaderPair, time_era: &TimeEra) -> Block {
        if self.date.is_none() || self.chain_length.is_none() || self.parent_id.is_none() {
            panic!("date,chain_length or hash is not set");
        }
        let contents: Contents = self.contents_builder.clone().into();
        block::builder(BlockVersion::Ed25519Signed, contents, |header_builder| {
            Ok::<_, ()>(
                header_builder
                    .set_parent(&self.parent_id.unwrap(), self.chain_length.unwrap())
                    .set_date(self.date.unwrap().next(time_era))
                    .into_bft_builder()
                    .unwrap()
                    .sign_using(&leader.key())
                    .generalize(),
            )
        })
        .unwrap()
    }
}