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use super::proto::{ReplEntryV1, ReplRefreshContext};
use crate::prelude::*;

impl<'a> QueryServerReadTransaction<'a> {
    // Given a consumers state, calculate the differential of changes they
    // need to be sent to bring them to the equivalent state.

    // We use the RUV or Cookie to determine if:
    // * The consumer requires a full-reinit.
    // * Which entry attr-states need to be sent, if any

    #[instrument(level = "debug", skip_all)]
    pub fn supplier_provide_changes(&mut self) -> Result<(), OperationError> {
        Ok(())
    }

    #[instrument(level = "debug", skip_all)]
    pub fn supplier_provide_refresh(&mut self) -> Result<ReplRefreshContext, OperationError> {
        // Get the current schema. We use this for attribute and entry filtering.
        let schema = self.get_schema();

        // A refresh must provide
        //
        // * the current domain version
        let domain_version = self.d_info.d_vers;
        let domain_uuid = self.d_info.d_uuid;

        // * the domain uuid
        // * the set of schema entries
        // * the set of non-schema entries
        // - We must exclude certain entries and attributes!
        //   * schema defines what we exclude!

        let schema_filter = filter!(f_or!([
            f_eq("class", PVCLASS_ATTRIBUTETYPE.clone()),
            f_eq("class", PVCLASS_CLASSTYPE.clone()),
        ]));

        let meta_filter = filter!(f_or!([
            f_eq("uuid", PVUUID_DOMAIN_INFO.clone()),
            f_eq("uuid", PVUUID_SYSTEM_INFO.clone()),
            f_eq("uuid", PVUUID_SYSTEM_CONFIG.clone()),
        ]));

        let entry_filter = filter!(f_and!([
            f_pres("class"),
            f_andnot(f_or(vec![
                // These are from above!
                f_eq("class", PVCLASS_ATTRIBUTETYPE.clone()),
                f_eq("class", PVCLASS_CLASSTYPE.clone()),
                f_eq("uuid", PVUUID_DOMAIN_INFO.clone()),
                f_eq("uuid", PVUUID_SYSTEM_INFO.clone()),
                f_eq("uuid", PVUUID_SYSTEM_CONFIG.clone()),
            ])),
        ]));

        let schema_entries = self
            .internal_search(schema_filter)
            .map(|ent| {
                ent.into_iter()
                    .map(|e| ReplEntryV1::new(e.as_ref(), schema))
                    .collect()
            })
            .map_err(|e| {
                error!("Failed to access schema entries");
                e
            })?;

        let meta_entries = self
            .internal_search(meta_filter)
            .map(|ent| {
                ent.into_iter()
                    .map(|e| ReplEntryV1::new(e.as_ref(), schema))
                    .collect()
            })
            .map_err(|e| {
                error!("Failed to access meta entries");
                e
            })?;

        let entries = self
            .internal_search(entry_filter)
            .map(|ent| {
                ent.into_iter()
                    .map(|e| ReplEntryV1::new(e.as_ref(), schema))
                    .collect()
            })
            .map_err(|e| {
                error!("Failed to access entries");
                e
            })?;

        Ok(ReplRefreshContext::V1 {
            domain_version,
            domain_uuid,
            schema_entries,
            meta_entries,
            entries,
        })
    }
}