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use bson::RawDocumentBuf;

use crate::{
    cmap::{conn::PinnedConnectionHandle, Command, RawCommandResponse, StreamDescription},
    concern::WriteConcern,
    cursor::CursorSpecification,
    error::{Error, Result},
    operation::{CursorBody, Operation, RunCommand},
    options::RunCursorCommandOptions,
    selection_criteria::SelectionCriteria,
};

#[derive(Debug, Clone)]
pub(crate) struct RunCursorCommand<'conn> {
    run_command: RunCommand<'conn>,
    options: Option<RunCursorCommandOptions>,
}

impl<'conn> RunCursorCommand<'conn> {
    pub(crate) fn new(
        run_command: RunCommand<'conn>,
        options: Option<RunCursorCommandOptions>,
    ) -> Result<Self> {
        Ok(Self {
            run_command,
            options,
        })
    }
}

impl<'conn> Operation for RunCursorCommand<'conn> {
    type O = CursorSpecification;
    type Command = RawDocumentBuf;

    const NAME: &'static str = "run_cursor_command";

    fn build(&mut self, description: &StreamDescription) -> Result<Command<Self::Command>> {
        self.run_command.build(description)
    }

    fn serialize_command(&mut self, cmd: Command<Self::Command>) -> Result<Vec<u8>> {
        self.run_command.serialize_command(cmd)
    }

    fn extract_at_cluster_time(
        &self,
        response: &bson::RawDocument,
    ) -> Result<Option<bson::Timestamp>> {
        self.run_command.extract_at_cluster_time(response)
    }

    fn handle_error(&self, error: Error) -> Result<Self::O> {
        Err(error)
    }

    fn selection_criteria(&self) -> Option<&SelectionCriteria> {
        self.run_command.selection_criteria()
    }

    fn is_acknowledged(&self) -> bool {
        self.run_command.is_acknowledged()
    }

    fn write_concern(&self) -> Option<&WriteConcern> {
        self.run_command.write_concern()
    }

    fn supports_read_concern(&self, description: &StreamDescription) -> bool {
        self.run_command.supports_read_concern(description)
    }

    fn supports_sessions(&self) -> bool {
        self.run_command.supports_sessions()
    }

    fn retryability(&self) -> crate::operation::Retryability {
        self.run_command.retryability()
    }

    fn update_for_retry(&mut self) {
        self.run_command.update_for_retry()
    }

    fn pinned_connection(&self) -> Option<&PinnedConnectionHandle> {
        self.run_command.pinned_connection()
    }

    fn name(&self) -> &str {
        self.run_command.name()
    }

    fn handle_response(
        &self,
        response: RawCommandResponse,
        description: &StreamDescription,
    ) -> Result<Self::O> {
        let cursor_response: CursorBody = response.body()?;

        let comment = match &self.options {
            Some(options) => options.comment.clone(),
            None => None,
        };

        Ok(CursorSpecification::new(
            cursor_response.cursor,
            description.server_address.clone(),
            self.options.as_ref().and_then(|opts| opts.batch_size),
            self.options.as_ref().and_then(|opts| opts.max_time),
            comment,
        ))
    }
}