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use crate::{
    bson::{doc, Document},
    cmap::{Command, RawCommandResponse, StreamDescription},
    cursor::CursorSpecification,
    error::Result,
    operation::{append_options, OperationWithDefaults},
    options::ListIndexesOptions,
    selection_criteria::{ReadPreference, SelectionCriteria},
    Namespace,
};

use super::{CursorBody, Retryability};

#[cfg(test)]
mod test;

pub(crate) struct ListIndexes {
    ns: Namespace,
    options: Option<ListIndexesOptions>,
}

impl ListIndexes {
    pub(crate) fn new(ns: Namespace, options: Option<ListIndexesOptions>) -> Self {
        ListIndexes { ns, options }
    }

    #[cfg(test)]
    pub(crate) fn empty() -> Self {
        Self {
            ns: Namespace {
                db: String::new(),
                coll: String::new(),
            },
            options: None,
        }
    }
}

impl OperationWithDefaults for ListIndexes {
    type O = CursorSpecification;
    type Command = Document;

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

    fn build(&mut self, _description: &StreamDescription) -> Result<Command> {
        let mut body = doc! {
            "listIndexes": self.ns.coll.clone(),
        };
        if let Some(size) = self.options.as_ref().and_then(|o| o.batch_size) {
            body.insert("cursor", doc! { "batchSize": size });
        }
        append_options(&mut body, self.options.as_ref())?;

        Ok(Command::new(
            Self::NAME.to_string(),
            self.ns.db.clone(),
            body,
        ))
    }

    fn handle_response(
        &self,
        raw_response: RawCommandResponse,
        description: &StreamDescription,
    ) -> Result<Self::O> {
        let response: CursorBody = raw_response.body()?;
        Ok(CursorSpecification::new(
            response.cursor,
            description.server_address.clone(),
            self.options.as_ref().and_then(|o| o.batch_size),
            self.options.as_ref().and_then(|o| o.max_time),
            None,
        ))
    }

    fn selection_criteria(&self) -> Option<&SelectionCriteria> {
        Some(SelectionCriteria::ReadPreference(ReadPreference::Primary)).as_ref()
    }

    fn retryability(&self) -> Retryability {
        Retryability::Read
    }
}