//! Security tests for design audit API endpoints
//!
//! Verifies that the design quality audit APIs are secure against:
//! - Input validation attacks
//! - DoS/resource exhaustion
//! - Information disclosure
//!
//! **Execution engine:** none
//! **Infrastructure:** none
//! **Parallelism:** safe
#![allow(clippy::unwrap_used)] // Reason: test code, panics acceptable
#![allow(clippy::cast_precision_loss)] // Reason: test metrics use usize/u64→f64 for reporting
#![allow(clippy::cast_sign_loss)] // Reason: test data uses small positive integers
#![allow(clippy::cast_possible_truncation)] // Reason: test data values are small and bounded
#![allow(clippy::cast_possible_wrap)] // Reason: test data values are small and bounded
#![allow(clippy::cast_lossless)] // Reason: test code readability
#![allow(clippy::missing_panics_doc)] // Reason: test helper functions, panics are expected
#![allow(clippy::missing_errors_doc)] // Reason: test helper functions
#![allow(missing_docs)] // Reason: test code does not require documentation
#![allow(clippy::items_after_statements)] // Reason: test helpers defined near use site
#![allow(clippy::used_underscore_binding)] // Reason: test variables prefixed with _ by convention
#![allow(clippy::needless_pass_by_value)] // Reason: test helper signatures follow test patterns

use fraiseql_server::routes::api::design::DesignAuditRequest;
use serde_json::json;

// ============================================================================
// Input Validation Tests
// ============================================================================

#[test]
fn test_design_audit_rejects_extremely_large_schema() {
    let mut large_types = vec![];
    for i in 0..10000 {
        large_types.push(format!(
            r#"{{"name": "Type{}", "fields": [{{"name": "id", "type": "ID"}}]}}"#,
            i
        ));
    }
    let large_schema = format!(r#"{{"types": [{}]}}"#, large_types.join(","));

    let parsed: serde_json::Value = serde_json::from_str(&large_schema).unwrap();
    let req = DesignAuditRequest { schema: parsed };

    // Verify the large schema was parsed correctly with all 10,000 types
    let types = req.schema.get("types").unwrap().as_array().unwrap();
    assert_eq!(types.len(), 10000, "All 10,000 types should be parsed");
    assert_eq!(types[0]["name"], "Type0");
    assert_eq!(types[9999]["name"], "Type9999");
}

#[test]
fn test_design_audit_handles_malformed_json() {
    let malformed_schema = r#"{"types": [{"name": "User", malformed}]}"#;
    let result = serde_json::from_str::<serde_json::Value>(malformed_schema);
    assert!(result.is_err(), "Malformed JSON should fail to parse");
}

#[test]
fn test_design_audit_handles_null_schema() {
    let req = DesignAuditRequest {
        schema: json!(null),
    };
    assert!(req.schema.is_null(), "Null schema should remain null");
    assert!(req.schema.get("types").is_none(), "Null schema has no types");
}

#[test]
fn test_design_audit_handles_recursive_structures() {
    let schema = json!({
        "types": [
            {"name": "User", "fields": [{"ref": "self"}]}
        ]
    });

    let req = DesignAuditRequest { schema };

    // Verify the self-referential field structure is preserved
    let fields = req.schema["types"][0]["fields"].as_array().unwrap();
    assert_eq!(fields.len(), 1);
    assert_eq!(fields[0]["ref"], "self", "Self-reference should be preserved");
}

// ============================================================================
// Resource Exhaustion & DoS Prevention
// ============================================================================

#[test]
fn test_design_audit_handles_deeply_nested_json() {
    // 128 levels of nesting (serde_json's default recursion limit)
    let mut nested = String::from(r#"{"value""#);
    for _ in 0..128 {
        nested.push_str(r#": {"value""#);
    }
    for _ in 0..128 {
        nested.push('}');
    }
    nested.push('}');

    // serde_json should reject or handle extreme nesting gracefully
    let result = serde_json::from_str::<serde_json::Value>(&nested);
    assert!(
        result.is_err(),
        "Deeply nested JSON (128+ levels) should hit serde_json's recursion limit"
    );
}

#[test]
fn test_design_audit_rejects_unicode_injection() {
    let schema = json!({
        "types": [{
            "name": "User🔓",
            "fields": [{"name": "id\u{0000}", "type": "ID"}]
        }]
    });

    let req = DesignAuditRequest { schema };

    // Verify unicode characters are preserved verbatim (no interpretation)
    let type_name = req.schema["types"][0]["name"].as_str().unwrap();
    assert!(type_name.contains('🔓'), "Unicode should be preserved, not stripped");

    let field_name = req.schema["types"][0]["fields"][0]["name"].as_str().unwrap();
    assert!(field_name.contains('\0'), "Null bytes should be preserved in JSON strings");
}

// ============================================================================
// Information Disclosure Tests
// ============================================================================

#[test]
fn test_design_audit_error_messages_dont_leak_paths() {
    let schema = json!({"types": []});
    let req = DesignAuditRequest { schema };

    let json_str = serde_json::to_string(&req.schema).unwrap();
    assert!(
        !json_str.contains("/home") && !json_str.contains("/etc") && !json_str.contains("C:\\"),
        "Serialized schema should not contain filesystem paths"
    );
}

#[test]
fn test_design_audit_sanitizes_schema_names() {
    let schema = json!({
        "types": [{
            "name": "../../../etc/passwd",
            "fields": []
        }]
    });

    let req = DesignAuditRequest { schema };

    // Path traversal in type names should be preserved as data (not interpreted)
    let name = req.schema["types"][0]["name"].as_str().unwrap();
    assert_eq!(name, "../../../etc/passwd", "Path traversal preserved as inert string data");
}

#[test]
fn test_design_audit_extra_fields_ignored_by_struct() {
    let schema = json!({
        "types": [],
        "extra1": "value",
        "extra2": {"nested": "data"},
        "extra3": [1, 2, 3]
    });

    let req = DesignAuditRequest { schema };

    // Extra fields exist in the raw JSON but shouldn't affect the audit
    assert_eq!(req.schema["types"].as_array().unwrap().len(), 0);
    assert_eq!(req.schema["extra1"], "value", "Extra fields preserved in raw JSON");
    // The key point: DesignAuditRequest only reads "types", so extras are inert
    assert!(req.schema.get("types").is_some());
}

// ============================================================================
// Authorization Tests
// ============================================================================

#[test]
fn test_design_audit_auth_fields_survive_roundtrip() {
    let schema = json!({
        "types": [{
            "name": "Admin",
            "fields": [
                {"name": "secret", "type": "String", "requires_auth": true, "required_role": "admin"}
            ]
        }]
    });

    let req = DesignAuditRequest { schema };

    // Verify auth metadata is preserved through construction
    let field = &req.schema["types"][0]["fields"][0];
    assert_eq!(field["requires_auth"], true, "Auth requirement must survive");
    assert_eq!(field["required_role"], "admin", "Role requirement must survive");

    // Verify survives JSON roundtrip
    let serialized = serde_json::to_string(&req.schema).unwrap();
    let deserialized: serde_json::Value = serde_json::from_str(&serialized).unwrap();
    assert_eq!(
        deserialized["types"][0]["fields"][0]["required_role"], "admin",
        "Auth metadata must survive serialization roundtrip"
    );
}

// ============================================================================
// Edge Cases
// ============================================================================

#[test]
fn test_design_audit_recovers_from_invalid_type_field() {
    let schema = json!({
        "types": [{
            "name": "User",
            "fields": [{"name": "id", "type": 123}]
        }]
    });

    let req = DesignAuditRequest { schema };

    // Verify the invalid type value (number instead of string) is preserved
    let type_value = &req.schema["types"][0]["fields"][0]["type"];
    assert!(type_value.is_number(), "Invalid type field should be preserved as-is");
    assert_eq!(type_value.as_i64().unwrap(), 123);
}

#[test]
fn test_design_audit_request_is_serializable() {
    let schema = json!({
        "types": [{"name": "User", "fields": []}]
    });

    let req = DesignAuditRequest { schema };

    let json_str = serde_json::to_string(&req.schema).unwrap();
    assert!(!json_str.is_empty(), "Serialized schema should not be empty");
    assert!(json_str.contains("\"types\""), "Should contain 'types' field");

    // Verify round-trip fidelity
    let reparsed: serde_json::Value = serde_json::from_str(&json_str).unwrap();
    assert_eq!(reparsed["types"][0]["name"], "User");
}
