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use super::{
    block::Header,
    scalars::{
        Address,
        Bytes32,
        HexString,
        MessageId,
        TransactionId,
        U64,
    },
};
use crate::query::MessageQueryContext;
use anyhow::anyhow;
use async_graphql::{
    connection::{
        Connection,
        EmptyFields,
    },
    Context,
    Enum,
    Object,
};
use fuel_core_storage::iter::IntoBoxedIter;
use fuel_core_types::entities;

pub struct Message(pub(crate) entities::message::Message);

#[Object]
impl Message {
    async fn message_id(&self) -> MessageId {
        self.0.id().into()
    }

    async fn amount(&self) -> U64 {
        self.0.amount.into()
    }

    async fn sender(&self) -> Address {
        self.0.sender.into()
    }

    async fn recipient(&self) -> Address {
        self.0.recipient.into()
    }

    async fn nonce(&self) -> U64 {
        self.0.nonce.into()
    }

    async fn data(&self) -> HexString {
        self.0.data.clone().into()
    }

    async fn da_height(&self) -> U64 {
        self.0.da_height.as_u64().into()
    }

    async fn status(&self) -> MessageStatus {
        self.0.status.into()
    }
}

#[derive(Enum, Copy, Clone, Eq, PartialEq)]
#[graphql(remote = "entities::message::MessageStatus")]
pub enum MessageStatus {
    Unspent,
    Spent,
}

#[derive(Default)]
pub struct MessageQuery {}

#[Object]
impl MessageQuery {
    async fn messages(
        &self,
        ctx: &Context<'_>,
        #[graphql(desc = "address of the owner")] owner: Option<Address>,
        first: Option<i32>,
        after: Option<String>,
        last: Option<i32>,
        before: Option<String>,
    ) -> async_graphql::Result<Connection<MessageId, Message, EmptyFields, EmptyFields>>
    {
        let query = MessageQueryContext(ctx.data_unchecked());
        crate::schema::query_pagination(after, before, first, last, |start, direction| {
            let start = *start;

            let messages = if let Some(owner) = owner {
                // Rocksdb doesn't support reverse iteration over a prefix
                if matches!(last, Some(last) if last > 0) {
                    return Err(anyhow!(
                        "reverse pagination isn't supported for this resource"
                    )
                    .into())
                }

                query
                    .owned_messages(&owner.0, start.map(Into::into), direction)
                    .into_boxed()
            } else {
                query
                    .all_messages(start.map(Into::into), direction)
                    .into_boxed()
            };

            let messages = messages.map(|result| {
                result
                    .map(|message| (message.id().into(), message.into()))
                    .map_err(Into::into)
            });

            Ok(messages)
        })
        .await
    }

    async fn message_proof(
        &self,
        ctx: &Context<'_>,
        transaction_id: TransactionId,
        message_id: MessageId,
    ) -> async_graphql::Result<Option<MessageProof>> {
        let data = MessageQueryContext(ctx.data_unchecked());
        Ok(
            crate::query::message_proof(&data, transaction_id.into(), message_id.into())?
                .map(MessageProof),
        )
    }
}

pub struct MessageProof(pub(crate) entities::message::MessageProof);

#[Object]
impl MessageProof {
    async fn proof_set(&self) -> Vec<Bytes32> {
        self.0
            .proof_set
            .iter()
            .cloned()
            .map(Bytes32::from)
            .collect()
    }

    async fn proof_index(&self) -> U64 {
        self.0.proof_index.into()
    }

    async fn sender(&self) -> Address {
        self.0.sender.into()
    }

    async fn recipient(&self) -> Address {
        self.0.recipient.into()
    }

    async fn nonce(&self) -> Bytes32 {
        self.0.nonce.into()
    }

    async fn amount(&self) -> U64 {
        self.0.amount.into()
    }

    async fn data(&self) -> HexString {
        self.0.data.clone().into()
    }

    async fn signature(&self) -> super::scalars::Signature {
        self.0.signature.into()
    }

    async fn header(&self) -> Header {
        Header(self.0.header.clone())
    }
}

impl From<entities::message::Message> for Message {
    fn from(message: entities::message::Message) -> Self {
        Message(message)
    }
}