// file: crates/ksp-config-lib/unit_tests/environment.rs
// version: 5

#[test]
fn process_environment_wins_over_dotenv_and_fallback_even_when_empty() {
    let mut process = std::collections::BTreeMap::<String, String>::new();
    process.insert("KSP_LOGS_DIRECTORY".to_owned(), String::new());
    let mut dotenv = std::collections::BTreeMap::<String, String>::new();
    dotenv.insert("KSP_LOGS_DIRECTORY".to_owned(), "dotenv-logs".to_owned());
    let environment = super::ConfigEnvironment::from_maps(process, dotenv);
    let resolved = environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::Some("fallback-logs"));
    assert!(resolved.is_ok(), "process value should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), "");
    assert_eq!(resolved.source(), super::ConfigEnvironmentSource::Process);
}

#[test]
fn dotenv_wins_over_fallback_when_process_value_is_absent() {
    let process = std::collections::BTreeMap::<String, String>::new();
    let mut dotenv = std::collections::BTreeMap::<String, String>::new();
    dotenv.insert("KSP_LOGS_DIRECTORY".to_owned(), "dotenv-logs".to_owned());
    let environment = super::ConfigEnvironment::from_maps(process, dotenv);
    let resolved = environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::Some("fallback-logs"));
    assert!(resolved.is_ok(), "dotenv value should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), "dotenv-logs");
    assert_eq!(resolved.source(), super::ConfigEnvironmentSource::DotEnv);
}

#[test]
fn empty_dotenv_value_is_defined_and_beats_fallback() {
    let mut dotenv = std::collections::BTreeMap::<String, String>::new();
    dotenv.insert("KSP_LOGS_DIRECTORY".to_owned(), String::new());
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), dotenv);
    let resolved = environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::Some("fallback-logs"));
    assert!(resolved.is_ok(), "empty dotenv value should resolve");
    if let std::result::Result::Ok(resolved) = resolved {
        assert_eq!(resolved.value(), "");
        assert_eq!(resolved.source(), super::ConfigEnvironmentSource::DotEnv);
    }
}

#[test]
fn fallback_is_used_only_when_external_sources_are_absent() {
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let resolved = environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::Some("fallback-logs"));
    assert!(resolved.is_ok(), "fallback should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), "fallback-logs");
    assert_eq!(resolved.source(), super::ConfigEnvironmentSource::Fallback);
}

#[test]
fn missing_variable_without_fallback_is_a_distinct_error() {
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let resolved = environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::None);
    let error = match resolved {
        std::result::Result::Ok(_) => return,
        std::result::Result::Err(error) => error,
    };
    assert_eq!(error.code(), crate::ERROR_CODE_ENVIRONMENT_VARIABLE_MISSING);
    assert!(!error.to_string().contains("fallback-logs"));
}

#[test]
fn ksp_and_kspb_namespaces_are_supported_but_external_names_are_rejected() {
    let mut process = std::collections::BTreeMap::<String, String>::new();
    process.insert("KSP_LOGS_DIRECTORY".to_owned(), "logs".to_owned());
    let bot_variable = ["KSPB_", "TEST_KEY"].concat();
    process.insert(bot_variable.clone(), "hidden".to_owned());
    let environment = super::ConfigEnvironment::from_maps(process, std::collections::BTreeMap::new());
    assert!(environment.resolve_variable("KSP_LOGS_DIRECTORY", std::option::Option::None).is_ok());
    assert!(environment.resolve_variable(bot_variable.as_str(), std::option::Option::None).is_ok());
    let external = environment.resolve_variable("OTHER_NETWORK", std::option::Option::None);
    let error = match external {
        std::result::Result::Ok(_) => return,
        std::result::Result::Err(error) => error,
    };
    assert_eq!(error.code(), crate::ERROR_CODE_ENVIRONMENT_VARIABLE_INVALID);
}

#[test]
fn text_resolver_supports_multiple_placeholders_and_literal_fallbacks() {
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let resolved = environment.resolve_text("logs=${KSP_LOGS_DIRECTORY:-logs};second=${KSP_LOGS_DIRECTORY:-other}");
    assert!(resolved.is_ok(), "multiple placeholders should resolve");
    if let std::result::Result::Ok(resolved) = resolved {
        assert_eq!(resolved, "logs=logs;second=other");
    }
}

#[test]
fn malformed_or_nested_placeholders_are_rejected() {
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let unclosed = environment.resolve_text("${KSP_LOGS_DIRECTORY");
    let unclosed = match unclosed {
        std::result::Result::Ok(_) => return,
        std::result::Result::Err(error) => error,
    };
    assert_eq!(unclosed.code(), crate::ERROR_CODE_ENVIRONMENT_PLACEHOLDER_INVALID);
    let nested = environment.resolve_text("${KSP_LOGS_DIRECTORY:-${KSP_LOGS_DIRECTORY}}}");
    let nested = match nested {
        std::result::Result::Ok(_) => return,
        std::result::Result::Err(error) => error,
    };
    assert_eq!(nested.code(), crate::ERROR_CODE_ENVIRONMENT_PLACEHOLDER_INVALID);
}

#[test]
fn json_resolver_walks_objects_and_arrays_without_changing_keys() {
    let mut dotenv = std::collections::BTreeMap::<String, String>::new();
    dotenv.insert("KSP_LOGS_DIRECTORY".to_owned(), "runtime-logs".to_owned());
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), dotenv);
    let source = serde_json::json!({"path": "${KSP_LOGS_DIRECTORY}", "items": [1, "${KSP_LOGS_DIRECTORY}"], "enabled": true});
    let resolved = environment.resolve_json(&source);
    assert!(resolved.is_ok(), "recursive JSON resolution should succeed");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved["path"], serde_json::Value::String("runtime-logs".to_owned()));
    assert_eq!(resolved["items"][1], serde_json::Value::String("runtime-logs".to_owned()));
    assert_eq!(resolved["enabled"], serde_json::Value::Bool(true));
}

#[test]
fn dotenv_parser_supports_comments_export_quotes_empty_values_and_ignores_external_keys() {
    let path = std::path::Path::new("fixture.env");
    let content = "# comment\nexport KSP_LOGS_DIRECTORY = 'quoted logs'\nOTHER_TOOL=value\n";
    let parsed = super::parse_dotenv_content(path, content);
    assert!(parsed.is_ok(), "dotenv fixture should parse");
    let parsed = match parsed {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(parsed.get("KSP_LOGS_DIRECTORY").map(String::as_str), std::option::Option::Some("quoted logs"));
    assert!(!parsed.contains_key("OTHER_TOOL"));
}

#[test]
fn dotenv_duplicate_ksp_key_is_rejected() {
    let parsed = super::parse_dotenv_content(std::path::Path::new("fixture.env"), "KSP_LOGS_DIRECTORY=one\nKSP_LOGS_DIRECTORY=two\n");
    let error = match parsed {
        std::result::Result::Ok(_) => return,
        std::result::Result::Err(error) => error,
    };
    assert_eq!(error.code(), crate::ERROR_CODE_DOTENV_SYNTAX_INVALID);
}

#[test]
fn fake_process_collection_filters_unrelated_names_without_mutating_real_environment() {
    let values = vec![
        (std::ffi::OsString::from("KSP_LOGS_DIRECTORY"), std::ffi::OsString::from("process-logs")),
        (std::ffi::OsString::from("OTHER_TOOL"), std::ffi::OsString::from("ignored")),
    ];
    let collected = super::collect_process_environment(values);
    assert!(collected.is_ok(), "fake process environment should collect");
    let collected = match collected {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(collected.len(), 1);
    assert_eq!(collected.get("KSP_LOGS_DIRECTORY").map(String::as_str), std::option::Option::Some("process-logs"));
}

#[test]
fn logging_fixture_profile_resolves_environment_fallback_without_changing_source_profile() {
    let bootstrap = logging_fixture_bootstrap();
    assert!(bootstrap.is_ok(), "bootstrap should resolve committed roots");
    let bootstrap = match bootstrap {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let registry = crate::ConfigFileRegistry::defaults();
    assert!(registry.is_ok(), "default registry should build");
    let registry = match registry {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let engine = crate::ConfigDocumentEngine::new(bootstrap, registry);
    let file_id = crate::ConfigFileId::new(crate::FILE_ID_STD_LOGGING);
    let file_id = match file_id {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let profile = engine.load_resolved_profile(&file_id, std::option::Option::None);
    assert!(profile.is_ok(), "committed Logging profile should resolve");
    let profile = match profile {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let effective = profile.resolve_effective_environment(&environment);
    assert!(effective.is_ok(), "committed Logging environment fallback should resolve");
    let effective = match effective {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(profile.effective().get("logs_directory").and_then(serde_json::Value::as_str), std::option::Option::Some("${KSP_LOGS_DIRECTORY:-logs}"));
    assert_eq!(effective.get("logs_directory").and_then(serde_json::Value::as_str), std::option::Option::Some("logs"));
}

#[test]
fn env_example_inventory_contains_current_runtime_variable_with_preceding_comment() {
    let content = std::fs::read_to_string(workspace_root().join(crate::DEFAULT_DOTENV_EXAMPLE_PATH));
    assert!(content.is_ok(), ".env.example must be committed at workspace root");
    let content = match content {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let lines = content.lines().collect::<std::vec::Vec<&str>>();
    let mut found = false;
    for index in 0..lines.len() {
        if lines[index].starts_with("KSP_LOGS_DIRECTORY=") {
            found = true;
            assert!(index > 0, "environment entry must have a preceding comment");
            assert!(lines[index - 1].trim_start().starts_with('#'), "environment entry must be immediately preceded by a comment");
        }
    }
    assert!(found, "current Config environment variable must appear in .env.example");
}

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

fn logging_fixture_bootstrap() -> ksp_core_lib::Result<crate::ConfigBootstrapOptions> {
    let fixture_root = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("unit_tests/fixtures");
    let workspace = workspace_root();
    return crate::ConfigBootstrapOptions::from_paths(fixture_root, workspace.join("config/schemas"));
}

#[test]
fn secret_environment_value_keeps_real_value_but_redacts_safe_and_debug_views() {
    let canary = "KSP_SECRET_CANARY_91b7c6";
    let mut process = std::collections::BTreeMap::<String, String>::new();
    process.insert("KSP_SECRET_TEST_TOKEN".to_owned(), canary.to_owned());
    let environment = super::ConfigEnvironment::from_maps(process, std::collections::BTreeMap::new());
    let resolved = environment.resolve_variable("KSP_SECRET_TEST_TOKEN", std::option::Option::None);
    assert!(resolved.is_ok(), "secret process value should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), canary);
    assert_eq!(resolved.safe_value(), crate::REDACTED_CONFIG_VALUE);
    assert_eq!(resolved.sensitivity(), crate::ConfigSensitivity::Secret);
    assert_eq!(resolved.source(), super::ConfigEnvironmentSource::Process);
    let debug = format!("{resolved:?}");
    assert!(!debug.contains(canary), "Debug must not reveal the secret canary");
    assert!(debug.contains(crate::REDACTED_CONFIG_VALUE));
}

#[test]
fn detailed_text_redacts_only_secret_segments_and_keeps_ordered_provenance() {
    let secret = "secret-canary-4a62";
    let mut process = std::collections::BTreeMap::<String, String>::new();
    process.insert("KSP_PUBLIC_HOST".to_owned(), "rpc.example.test".to_owned());
    process.insert("KSP_SECRET_TOKEN".to_owned(), secret.to_owned());
    let environment = super::ConfigEnvironment::from_maps(process, std::collections::BTreeMap::new());
    let resolved = environment.resolve_text_detailed("https://${KSP_PUBLIC_HOST}/?token=${KSP_SECRET_TOKEN}");
    assert!(resolved.is_ok(), "composed secret URL should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), "https://rpc.example.test/?token=secret-canary-4a62");
    assert_eq!(resolved.safe_value(), "https://rpc.example.test/?token=********");
    assert_eq!(resolved.sensitivity(), crate::ConfigSensitivity::Secret);
    assert_eq!(resolved.provenance().len(), 4);
    assert_eq!(resolved.provenance()[0], crate::ConfigValueProvenance::DocumentLiteral);
    assert_eq!(resolved.provenance()[1].variable_name(), std::option::Option::Some("KSP_PUBLIC_HOST"));
    assert_eq!(resolved.provenance()[2], crate::ConfigValueProvenance::DocumentLiteral);
    assert_eq!(resolved.provenance()[3].variable_name(), std::option::Option::Some("KSP_SECRET_TOKEN"));
    let debug = format!("{resolved:?}");
    assert!(!debug.contains(secret), "resolved text Debug must not reveal a secret segment");
}

#[test]
fn secret_fallback_inherits_secret_sensitivity_and_is_redacted() {
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let resolved = environment.resolve_text_detailed("token=${KSP_SECRET_TOKEN:-false-secret}");
    assert!(resolved.is_ok(), "secret fallback should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value(), "token=false-secret");
    assert_eq!(resolved.safe_value(), "token=********");
    assert_eq!(resolved.sensitivity(), crate::ConfigSensitivity::Secret);
    assert_eq!(resolved.provenance()[1].environment_source(), std::option::Option::Some(super::ConfigEnvironmentSource::Fallback));
}

#[test]
fn detailed_json_preserves_safe_tree_sensitivity_and_pointer_provenance() {
    let secret = "nested-secret-canary-2d11";
    let mut dotenv = std::collections::BTreeMap::<String, String>::new();
    dotenv.insert("KSP_SECRET_TOKEN".to_owned(), secret.to_owned());
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), dotenv);
    let source = serde_json::json!({"transport": {"url": "https://host/?token=${KSP_SECRET_TOKEN}"}, "items": ["plain", 7]});
    let resolved = environment.resolve_json_detailed(&source);
    assert!(resolved.is_ok(), "detailed JSON should resolve");
    let resolved = match resolved {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(resolved.value()["transport"]["url"], serde_json::Value::String(format!("https://host/?token={secret}")));
    assert_eq!(resolved.safe_value()["transport"]["url"], serde_json::Value::String("https://host/?token=********".to_owned()));
    assert_eq!(resolved.sensitivity(), crate::ConfigSensitivity::Secret);
    let provenance = resolved.provenance_at("/transport/url");
    assert!(provenance.is_some(), "JSON pointer provenance should exist");
    if let std::option::Option::Some(provenance) = provenance {
        assert_eq!(provenance.last().and_then(crate::ConfigValueProvenance::variable_name), std::option::Option::Some("KSP_SECRET_TOKEN"));
    }
    let debug = format!("{resolved:?}");
    assert!(!debug.contains(secret), "resolved JSON Debug must not reveal a secret canary");
}

#[test]
fn detailed_fixture_profile_environment_keeps_global_origin_and_adds_environment_provenance() {
    let bootstrap = logging_fixture_bootstrap();
    let bootstrap = match bootstrap {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let registry = crate::ConfigFileRegistry::defaults();
    let registry = match registry {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let file_id = crate::ConfigFileId::new(crate::FILE_ID_STD_LOGGING);
    let file_id = match file_id {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let engine = crate::ConfigDocumentEngine::new(bootstrap, registry);
    let profile = engine.load_resolved_profile(&file_id, std::option::Option::None);
    let profile = match profile {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    let environment = super::ConfigEnvironment::from_maps(std::collections::BTreeMap::new(), std::collections::BTreeMap::new());
    let effective = profile.resolve_effective_environment_detailed(&environment);
    assert!(effective.is_ok(), "detailed committed Logging profile should resolve");
    let effective = match effective {
        std::result::Result::Ok(value) => value,
        std::result::Result::Err(_) => return,
    };
    assert_eq!(profile.origin("logs_directory"), std::option::Option::Some(crate::ConfigValueOrigin::Global));
    assert_eq!(effective.value()["logs_directory"], serde_json::Value::String("logs".to_owned()));
    assert_eq!(effective.safe_value()["logs_directory"], serde_json::Value::String("logs".to_owned()));
    assert_eq!(
        effective.provenance_at("/logs_directory").and_then(|items| return items.last()).and_then(crate::ConfigValueProvenance::variable_name),
        std::option::Option::Some("KSP_LOGS_DIRECTORY"),
    );
}