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use scylla::frame::value::ValueList;
use scylla::query::Query;
use scylla::{Bytes, IntoTypedRows};
use scylla::{CachingSession, QueryResult};

use crate::errors::CharybdisError;
use crate::iterator::CharybdisModelIterator;
use crate::model::BaseModel;
use crate::stream::CharybdisModelStream;

pub trait Find: BaseModel {
    async fn find(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError>;

    async fn find_first(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
    ) -> Result<Self, CharybdisError>;

    async fn find_paged(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
        page_size: Option<Bytes>,
    ) -> Result<(CharybdisModelIterator<Self>, Option<Bytes>), CharybdisError>;

    async fn find_by_primary_key_value(session: &CachingSession, value: impl ValueList)
        -> Result<Self, CharybdisError>;

    async fn find_by_partition_key_value(
        session: &CachingSession,
        value: impl ValueList,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError>;

    async fn find_first_by_partition_key_value(
        session: &CachingSession,
        value: impl ValueList,
    ) -> Result<Self, CharybdisError>;

    async fn find_by_primary_key(&self, session: &CachingSession) -> Result<Self, CharybdisError>;

    async fn find_by_partition_key(
        &self,
        session: &CachingSession,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError>;
}

impl<T: BaseModel> Find for T {
    // find iter
    async fn find(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError> {
        let query = Query::new(query);

        let rows = session.execute_iter(query, values).await?.into_typed();

        Ok(CharybdisModelStream::from(rows))
    }

    async fn find_first(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
    ) -> Result<Self, CharybdisError> {
        let result: QueryResult = session.execute(query, values).await?;
        let typed_row: Self = result.first_row_typed()?;

        Ok(typed_row)
    }

    async fn find_paged(
        session: &CachingSession,
        query: &'static str,
        values: impl ValueList,
        paging_state: Option<Bytes>,
    ) -> Result<(CharybdisModelIterator<Self>, Option<Bytes>), CharybdisError> {
        let res = session.execute_paged(query, values, paging_state).await?;
        let paging_state = res.paging_state.clone();
        let rows = res.rows()?;
        let typed_rows = CharybdisModelIterator::from(rows.into_typed());

        Ok((typed_rows, paging_state))
    }

    async fn find_by_primary_key_value(
        session: &CachingSession,
        value: impl ValueList,
    ) -> Result<Self, CharybdisError> {
        let result: QueryResult = session.execute(Self::FIND_BY_PRIMARY_KEY_QUERY, value).await?;

        let res = result.first_row_typed()?;

        Ok(res)
    }

    async fn find_by_partition_key_value(
        session: &CachingSession,
        value: impl ValueList,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError> {
        let rows = session
            .execute_iter(Self::FIND_BY_PARTITION_KEY_QUERY, value)
            .await?
            .into_typed::<Self>();

        Ok(CharybdisModelStream::from(rows))
    }

    async fn find_first_by_partition_key_value(
        session: &CachingSession,
        value: impl ValueList,
    ) -> Result<Self, CharybdisError> {
        let result: QueryResult = session.execute(Self::FIND_BY_PARTITION_KEY_QUERY, value).await?;

        let res = result.first_row_typed()?;

        Ok(res)
    }

    /// Preferred way to find by partition key, as keys will be in correct order
    async fn find_by_primary_key(&self, session: &CachingSession) -> Result<Self, CharybdisError> {
        let primary_key_values = self
            .primary_key_values()
            .map_err(|e| CharybdisError::SerializeValuesError(e, Self::DB_MODEL_NAME.to_string()))?;

        let result: QueryResult = session
            .execute(Self::FIND_BY_PRIMARY_KEY_QUERY, &primary_key_values)
            .await?;

        let res = result.first_row_typed()?;

        Ok(res)
    }

    /// Preferred way to find by partition key, as keys will be in correct order
    async fn find_by_partition_key(
        &self,
        session: &CachingSession,
    ) -> Result<CharybdisModelStream<Self>, CharybdisError> {
        let partition_key_values = self
            .partition_key_values()
            .map_err(|e| CharybdisError::SerializeValuesError(e, Self::DB_MODEL_NAME.to_string()))?;

        let rows = session
            .execute_iter(Self::FIND_BY_PARTITION_KEY_QUERY, partition_key_values)
            .await?
            .into_typed::<Self>();

        Ok(CharybdisModelStream::from(rows))
    }
}