use bat_adapters::manifest::ManifestDriverRegistry;
use bat_core::repositories::cas_repository::CasRepository;
use bat_core::repositories::resource_repository::{ResourceQuery, ResourceRepository};
use bat_infrastructure::{
    BundleSource, FileSystemCasRepository, InMemoryResourceRepository, ResourceImportService,
};
use serde_json::json;
use tempfile::TempDir;

fn push_c_string(data: &mut Vec<u8>, value: &str) {
    data.extend_from_slice(value.as_bytes());
    data.push(0);
}

fn push_u16(data: &mut Vec<u8>, value: u16) {
    data.extend_from_slice(&value.to_be_bytes());
}

fn push_u32(data: &mut Vec<u8>, value: u32) {
    data.extend_from_slice(&value.to_be_bytes());
}

fn push_i32(data: &mut Vec<u8>, value: i32) {
    data.extend_from_slice(&value.to_be_bytes());
}

fn push_u64(data: &mut Vec<u8>, value: u64) {
    data.extend_from_slice(&value.to_be_bytes());
}

fn align(data: &mut Vec<u8>, alignment: usize) {
    let remainder = data.len() % alignment;
    if remainder != 0 {
        data.resize(data.len() + alignment - remainder, 0);
    }
}

fn synthetic_minimal_unityfs_bundle() -> Vec<u8> {
    let mut blocks_info = Vec::new();
    blocks_info.extend_from_slice(&[0; 16]);
    push_i32(&mut blocks_info, 1);
    push_u32(&mut blocks_info, 4);
    push_u32(&mut blocks_info, 4);
    push_u16(&mut blocks_info, 0);
    push_i32(&mut blocks_info, 1);
    push_u64(&mut blocks_info, 0);
    push_u64(&mut blocks_info, 4);
    push_u32(&mut blocks_info, 0);
    push_c_string(&mut blocks_info, "SYNTHETIC-GOLDEN-CAB");

    let mut data = Vec::new();
    push_c_string(&mut data, "UnityFS");
    push_u32(&mut data, 8);
    push_c_string(&mut data, "5.x.x");
    push_c_string(&mut data, "2021.3.56f2");
    push_u64(&mut data, 0);
    push_u32(&mut data, blocks_info.len() as u32);
    push_u32(&mut data, blocks_info.len() as u32);
    push_u32(&mut data, 0);
    align(&mut data, 16);
    data.extend_from_slice(&blocks_info);
    data.extend_from_slice(b"data");

    let total_size = data.len() as u64;
    let total_size_offset = b"UnityFS\0".len() + 4 + b"5.x.x\0".len() + b"2021.3.56f2\0".len();
    data[total_size_offset..total_size_offset + 8].copy_from_slice(&total_size.to_be_bytes());
    data
}

#[tokio::test]
async fn imports_synthetic_addressables_catalog_bundle_against_golden() {
    let catalog = include_bytes!("fixtures/synthetic_phase2/catalog.json");
    let manifest = ManifestDriverRegistry::with_defaults()
        .parse(catalog)
        .await
        .unwrap();

    let temp_dir = TempDir::new().unwrap();
    let cas = FileSystemCasRepository::new(temp_dir.path().join("cas"));
    let resources = InMemoryResourceRepository::new();
    let service = ResourceImportService::new(&cas, &resources);

    let report = service
        .import_manifest_bundles(
            &manifest,
            &[BundleSource::new(
                "minimal.bundle",
                synthetic_minimal_unityfs_bundle(),
            )],
        )
        .await
        .unwrap();

    assert_eq!(report.imported.len(), 1);
    assert!(cas.exists(&report.imported[0].object_id).await);

    let indexed = resources.list(ResourceQuery::all()).await.unwrap();
    let actual = json!({
        "imported": report.imported.iter().map(|imported| {
            json!({
                "bytes": imported.bytes,
                "source_path": imported.source_path,
                "unityfs": {
                    "block_count": imported.unityfs.block_count,
                    "directories": imported.unityfs.directories,
                    "directory_count": imported.unityfs.directory_count,
                    "unity_version": imported.unityfs.unity_version,
                }
            })
        }).collect::<Vec<_>>(),
        "resource_count": indexed.len(),
        "skipped": report.skipped,
    });
    let expected: serde_json::Value =
        serde_json::from_str(include_str!("golden/synthetic_phase2_import.json")).unwrap();

    assert_eq!(actual, expected);
    assert_eq!(indexed[0].entry.hash, report.imported[0].object_id);
}