ic-query 0.2.28

//! Module: nns::proposals::report::cache::reports
//!
//! Responsibility: build NNS proposal cache list and status reports.
//! Does not own: refresh execution, live governance calls, or text rendering.
//! Boundary: loads local complete snapshots and projects cache metadata.

use super::{
    NNS_PROPOSAL_CACHE_LIST_REPORT_SCHEMA_VERSION, NNS_PROPOSAL_CACHE_SCHEMA_VERSION,
    NNS_PROPOSAL_CACHE_STATUS_REPORT_SCHEMA_VERSION,
    attempt::read_attempt_status,
    model::{
        NnsProposalCache, NnsProposalCacheListReport, NnsProposalCacheListRequest,
        NnsProposalCacheStatusReport, NnsProposalCacheStatusRequest, NnsProposalCacheSummary,
    },
    paths::{nns_proposal_cache_paths, nns_proposal_cache_root},
};
use crate::{
    cache_file::{LoadJsonCacheErrorMapper, LoadJsonCacheRequest},
    nns::proposals::report::{NnsProposalHostError, enforce_mainnet_network},
    snapshot_cache::{SnapshotCompleteness, load_complete_snapshot},
};
use std::{io, path::PathBuf};

/// Build a local NNS proposal cache list report.
pub(in crate::nns::proposals) fn build_nns_proposal_cache_list_report(
    request: &NnsProposalCacheListRequest,
) -> Result<NnsProposalCacheListReport, NnsProposalHostError> {
    enforce_mainnet_network(&request.network)?;
    let paths = nns_proposal_cache_paths(&request.icp_root, &request.network);
    let snapshot_path = paths.snapshot_path;
    let caches = if snapshot_path.is_file() {
        vec![load_nns_proposal_cache_summary(
            snapshot_path,
            &request.network,
        )?]
    } else {
        Vec::new()
    };
    Ok(NnsProposalCacheListReport {
        schema_version: NNS_PROPOSAL_CACHE_LIST_REPORT_SCHEMA_VERSION,
        network: request.network.clone(),
        cache_root: nns_proposal_cache_root(&request.icp_root, &request.network)
            .display()
            .to_string(),
        cache_count: caches.len(),
        caches,
    })
}

/// Build a local NNS proposal cache status report.
pub(in crate::nns::proposals) fn build_nns_proposal_cache_status_report(
    request: &NnsProposalCacheStatusRequest,
) -> Result<NnsProposalCacheStatusReport, NnsProposalHostError> {
    enforce_mainnet_network(&request.network)?;
    let paths = nns_proposal_cache_paths(&request.icp_root, &request.network);
    let cache = if paths.snapshot_path.is_file() {
        Some(load_nns_proposal_cache_summary(
            paths.snapshot_path.clone(),
            &request.network,
        )?)
    } else {
        None
    };
    let latest_attempt = cache
        .as_ref()
        .and_then(|summary| summary.latest_attempt.clone())
        .or_else(|| read_attempt_status(&paths.refresh_attempt_path));
    Ok(NnsProposalCacheStatusReport {
        schema_version: NNS_PROPOSAL_CACHE_STATUS_REPORT_SCHEMA_VERSION,
        network: request.network.clone(),
        cache_root: nns_proposal_cache_root(&request.icp_root, &request.network)
            .display()
            .to_string(),
        found: cache.is_some(),
        cache,
        expected_cache_path: paths.snapshot_path.display().to_string(),
        refresh_attempt_path: paths.refresh_attempt_path.display().to_string(),
        latest_attempt,
    })
}

fn load_nns_proposal_cache_summary(
    cache_path: PathBuf,
    network: &str,
) -> Result<NnsProposalCacheSummary, NnsProposalHostError> {
    let cache = load_nns_proposal_cache(cache_path.clone(), network)?;
    Ok(nns_proposal_cache_summary(cache_path, cache))
}

fn load_nns_proposal_cache(
    cache_path: PathBuf,
    network: &str,
) -> Result<NnsProposalCache, NnsProposalHostError> {
    load_complete_snapshot(
        LoadJsonCacheRequest {
            path: cache_path,
            network,
            expected_schema_version: NNS_PROPOSAL_CACHE_SCHEMA_VERSION,
        },
        NnsProposalCacheErrors,
        incomplete_snapshot_error,
    )
}

fn nns_proposal_cache_summary(
    cache_path: PathBuf,
    cache: NnsProposalCache,
) -> NnsProposalCacheSummary {
    let attempt_path = nns_proposal_cache_paths_for_cache_path(&cache_path);
    NnsProposalCacheSummary {
        governance_canister_id: cache.metadata.governance_canister_id,
        complete: cache.completeness.is_api_exhausted(),
        row_count: cache.completeness.row_count,
        page_count: cache.completeness.page_count,
        page_size: cache.completeness.page_size,
        fetched_at: cache.fetched_at,
        source_endpoint: cache.source_endpoint,
        cache_path: cache_path.display().to_string(),
        refresh_attempt_path: attempt_path.display().to_string(),
        latest_attempt: read_attempt_status(&attempt_path),
    }
}

fn nns_proposal_cache_paths_for_cache_path(cache_path: &std::path::Path) -> PathBuf {
    cache_path.with_file_name("full.refresh-attempt.json")
}

fn incomplete_snapshot_error(completeness: &SnapshotCompleteness) -> NnsProposalHostError {
    NnsProposalHostError::IncompleteRefresh {
        pages_fetched: completeness.page_count,
        rows_fetched: completeness.row_count,
        reason: "cached NNS proposals snapshot is not complete".to_string(),
    }
}

struct NnsProposalCacheErrors;

impl LoadJsonCacheErrorMapper for NnsProposalCacheErrors {
    type Error = NnsProposalHostError;

    fn missing_cache(&self, path: PathBuf) -> Self::Error {
        NnsProposalHostError::MissingProposalCache { path }
    }

    fn read_cache(&self, path: PathBuf, source: io::Error) -> Self::Error {
        NnsProposalHostError::ReadCache { path, source }
    }

    fn parse_cache(&self, path: PathBuf, source: serde_json::Error) -> Self::Error {
        NnsProposalHostError::ParseCache { path, source }
    }

    fn unsupported_schema(&self, version: u32, expected: u32) -> Self::Error {
        NnsProposalHostError::UnsupportedCacheSchemaVersion { version, expected }
    }

    fn network_mismatch(&self, requested: String, actual: String) -> Self::Error {
        NnsProposalHostError::CacheNetworkMismatch { requested, actual }
    }
}