// file: crates/ksp-config-lib/unit_tests/composite.rs
// version: 4

const TEST_COMPOSITE_FILENAME: &str = "examples/composite.example.json";
const TEST_COMPOSITE_FILE_ID: &str = "cfg.composite.test";

#[test]
fn fixture_composite_example_resolves_default_document_profile() {
    let engine = fixture_example_engine();
    let file_id = crate::ConfigFileId::new(TEST_COMPOSITE_FILE_ID);
    assert!(engine.is_ok(), "composite test engine should be constructible: {engine:?}");
    assert!(file_id.is_ok(), "composite test file_id should be valid: {file_id:?}");
    if let (std::result::Result::Ok(engine), std::result::Result::Ok(file_id)) = (engine, file_id) {
        let resolved = engine.load_resolved_composite(&file_id, std::option::Option::None);
        assert!(resolved.is_ok(), "fixture composite example should resolve: {resolved:?}");
        if let std::result::Result::Ok(resolved) = resolved {
            assert_eq!(resolved.profile_id(), "local_default");
            assert_eq!(resolved.selection_source(), crate::ConfigProfileSelectionSource::DefaultProfile);
            let logging = resolved.component("logging");
            assert!(logging.is_some(), "logging component should be resolved");
            if let std::option::Option::Some(logging) = logging {
                assert_eq!(logging.resolved().file_id().as_str(), crate::FILE_ID_STD_LOGGING);
                let logging_document = engine.load_validated_document(logging.resolved().file_id());
                assert!(logging_document.is_ok(), "referenced Logging document should validate: {logging_document:?}");
                if let std::result::Result::Ok(logging_document) = logging_document {
                    let default_profile = logging_document.value().get("default_profile").and_then(serde_json::Value::as_str);
                    assert_eq!(default_profile, std::option::Option::Some(logging.resolved().profile_id()));
                }
                assert_eq!(logging.resolved().selection_source(), crate::ConfigProfileSelectionSource::DefaultProfile);
                assert_eq!(logging.resolved().origin("logs_directory"), std::option::Option::Some(crate::ConfigValueOrigin::Global));
            }
        }
    }
}

#[test]
fn composite_profile_override_marks_referenced_profile_selection_as_composite() {
    let engine = fixture_example_engine();
    let file_id = crate::ConfigFileId::new(TEST_COMPOSITE_FILE_ID);
    assert!(engine.is_ok(), "composite test engine should be constructible: {engine:?}");
    assert!(file_id.is_ok(), "composite test file_id should be valid: {file_id:?}");
    if let (std::result::Result::Ok(engine), std::result::Result::Ok(file_id)) = (engine, file_id) {
        let resolved = engine.load_resolved_composite(&file_id, std::option::Option::Some("local_explicit"));
        assert!(resolved.is_ok(), "explicit composite profile should resolve: {resolved:?}");
        if let std::result::Result::Ok(resolved) = resolved {
            assert_eq!(resolved.selection_source(), crate::ConfigProfileSelectionSource::Explicit);
            let logging = resolved.component("logging");
            assert!(logging.is_some(), "logging component should be resolved");
            if let std::option::Option::Some(logging) = logging {
                assert_eq!(logging.resolved().profile_id(), "local_dev");
                assert_eq!(logging.resolved().selection_source(), crate::ConfigProfileSelectionSource::Composite);
            }
        }
    }
}

#[test]
fn unknown_composite_profile_has_profile_not_found_error() {
    let engine = fixture_example_engine();
    let file_id = crate::ConfigFileId::new(TEST_COMPOSITE_FILE_ID);
    assert!(engine.is_ok(), "composite test engine should be constructible: {engine:?}");
    assert!(file_id.is_ok(), "composite test file_id should be valid: {file_id:?}");
    if let (std::result::Result::Ok(engine), std::result::Result::Ok(file_id)) = (engine, file_id) {
        let result = engine.load_resolved_composite(&file_id, std::option::Option::Some("missing"));
        assert!(result.is_err(), "unknown composite profile must be rejected: {result:?}");
        if let std::result::Result::Err(error) = result {
            assert_eq!(error.code(), crate::ERROR_CODE_PROFILE_NOT_FOUND);
        }
    }
}

#[test]
fn unknown_referenced_file_id_is_rejected_during_composite_validation() {
    let fixture = fixture_roots("unknown-reference");
    let composite = r#"{
  "format_version": 1,
  "default_profile": "test",
  "profiles": [{
    "profile_id": "test",
    "documents": [{"component_id": "missing", "file_id": "cfg.std.missing"}]
  }]
}"#;
    let prepared = prepare_fixture(&fixture, composite);
    assert!(prepared.is_ok(), "composite fixture should be writable: {prepared:?}");
    if prepared.is_ok() {
        let engine = fixture_engine(&fixture);
        let file_id = crate::ConfigFileId::new(TEST_COMPOSITE_FILE_ID);
        assert!(engine.is_ok(), "fixture engine should be constructible: {engine:?}");
        if let (std::result::Result::Ok(engine), std::result::Result::Ok(file_id)) = (engine, file_id) {
            let result = engine.load_validated_document(&file_id);
            assert!(result.is_err(), "unknown composite reference must be rejected: {result:?}");
            if let std::result::Result::Err(error) = result {
                assert_eq!(error.code(), crate::ERROR_CODE_COMPOSITE_REFERENCE_INVALID);
            }
        }
    }
    cleanup_fixture(&fixture);
}

#[test]
fn duplicate_component_ids_are_rejected_inside_one_composite_profile() {
    let fixture = fixture_roots("duplicate-component");
    let composite = r#"{
  "format_version": 1,
  "default_profile": "test",
  "profiles": [{
    "profile_id": "test",
    "documents": [
      {"component_id": "logging", "file_id": "cfg.std.logging"},
      {"component_id": "logging", "file_id": "cfg.std.logging"}
    ]
  }]
}"#;
    let prepared = prepare_fixture(&fixture, composite);
    assert!(prepared.is_ok(), "composite fixture should be writable: {prepared:?}");
    if prepared.is_ok() {
        let engine = fixture_engine(&fixture);
        let file_id = crate::ConfigFileId::new(TEST_COMPOSITE_FILE_ID);
        assert!(engine.is_ok(), "fixture engine should be constructible: {engine:?}");
        if let (std::result::Result::Ok(engine), std::result::Result::Ok(file_id)) = (engine, file_id) {
            let result = engine.load_validated_document(&file_id);
            assert!(result.is_err(), "duplicate component_id must be rejected: {result:?}");
            if let std::result::Result::Err(error) = result {
                assert_eq!(error.code(), crate::ERROR_CODE_DOCUMENT_SEMANTIC_INVALID);
            }
        }
    }
    cleanup_fixture(&fixture);
}

fn fixture_example_engine() -> ksp_core_lib::Result<crate::ConfigDocumentEngine> {
    let workspace = workspace_root();
    let fixture_root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("unit_tests/fixtures");
    let bootstrap = crate::ConfigBootstrapOptions::from_paths(fixture_root, workspace.join("config/schemas"));
    let bootstrap = match bootstrap {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let registry = test_registry(TEST_COMPOSITE_FILENAME);
    return match registry {
        std::result::Result::Ok(value) => std::result::Result::Ok(crate::ConfigDocumentEngine::new(bootstrap, value)),
        std::result::Result::Err(error) => std::result::Result::Err(error),
    };
}

fn fixture_engine(fixture: &FixtureRoots) -> ksp_core_lib::Result<crate::ConfigDocumentEngine> {
    let bootstrap = crate::ConfigBootstrapOptions::from_paths(fixture.config.as_path(), fixture.schemas.as_path());
    let bootstrap = match bootstrap {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let registry = test_registry("composite.test.json");
    return match registry {
        std::result::Result::Ok(value) => std::result::Result::Ok(crate::ConfigDocumentEngine::new(bootstrap, value)),
        std::result::Result::Err(error) => std::result::Result::Err(error),
    };
}

fn test_registry(composite_filename: &'static str) -> ksp_core_lib::Result<crate::ConfigFileRegistry> {
    let logging = crate::registry::ConfigFileDescriptor::new(
        crate::FILE_ID_STD_LOGGING,
        crate::ConfigFileKind::Config,
        crate::DEFAULT_STD_LOGGING_FILENAME,
        std::option::Option::Some(crate::FILE_ID_SCHEMA_STD_LOGGING),
    );
    let logging = match logging {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let logging_schema = crate::registry::ConfigFileDescriptor::new(
        crate::FILE_ID_SCHEMA_STD_LOGGING,
        crate::ConfigFileKind::Schema,
        crate::DEFAULT_STD_LOGGING_SCHEMA_FILENAME,
        std::option::Option::None,
    );
    let logging_schema = match logging_schema {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let composite_schema = crate::registry::ConfigFileDescriptor::new(
        crate::FILE_ID_SCHEMA_COMPOSITE,
        crate::ConfigFileKind::Schema,
        crate::DEFAULT_COMPOSITE_SCHEMA_FILENAME,
        std::option::Option::None,
    );
    let composite_schema = match composite_schema {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    let composite = crate::registry::ConfigFileDescriptor::new(
        TEST_COMPOSITE_FILE_ID,
        crate::ConfigFileKind::Config,
        composite_filename,
        std::option::Option::Some(crate::FILE_ID_SCHEMA_COMPOSITE),
    );
    let composite = match composite {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(error) => return std::result::Result::Err(error),
    };
    return crate::build_registry([logging, logging_schema, composite_schema, composite]);
}

fn prepare_fixture(fixture: &FixtureRoots, composite: &str) -> std::io::Result<()> {
    cleanup_fixture(fixture);
    let config = std::fs::create_dir_all(fixture.config.as_path());
    if let std::result::Result::Err(error) = config {
        return std::result::Result::Err(error);
    }
    let schemas = std::fs::create_dir_all(fixture.schemas.as_path());
    if let std::result::Result::Err(error) = schemas {
        return std::result::Result::Err(error);
    }
    let workspace = workspace_root();
    let stable_logging = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("unit_tests/fixtures/std.logging.json");
    let logging = std::fs::copy(stable_logging, fixture.config.join(crate::DEFAULT_STD_LOGGING_FILENAME));
    if let std::result::Result::Err(error) = logging {
        return std::result::Result::Err(error);
    }
    let logging_schema =
        std::fs::copy(workspace.join("config/schemas/std.logging.schema.json"), fixture.schemas.join(crate::DEFAULT_STD_LOGGING_SCHEMA_FILENAME));
    if let std::result::Result::Err(error) = logging_schema {
        return std::result::Result::Err(error);
    }
    let composite_schema =
        std::fs::copy(workspace.join("config/schemas/composite.schema.json"), fixture.schemas.join(crate::DEFAULT_COMPOSITE_SCHEMA_FILENAME));
    if let std::result::Result::Err(error) = composite_schema {
        return std::result::Result::Err(error);
    }
    return std::fs::write(fixture.config.join("composite.test.json"), composite);
}

fn workspace_root() -> std::path::PathBuf {
    return std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../..");
}

struct FixtureRoots {
    root: std::path::PathBuf,
    config: std::path::PathBuf,
    schemas: std::path::PathBuf,
}

fn fixture_roots(name: &str) -> FixtureRoots {
    let root = std::env::temp_dir().join(format!("ksp-config-composite-{name}-{}", std::process::id()));
    return FixtureRoots { config: root.join("config"), schemas: root.join("schemas"), root };
}

fn cleanup_fixture(fixture: &FixtureRoots) {
    let removal = std::fs::remove_dir_all(fixture.root.as_path());
    if let std::result::Result::Err(error) = removal
        && error.kind() != std::io::ErrorKind::NotFound
    {
        eprintln!("unable to cleanup Config composite fixture {}: {error}", fixture.root.display());
    }
}