//! Contract tests for Kaccy API
//!
//! These tests verify API contracts remain consistent across versions.
//! Contract testing ensures backward compatibility and prevents breaking changes.

#[cfg(test)]
mod contract_tests {
    use serde_json::json;

    /// Test that API response schemas match expected contracts
    #[test]
    fn test_auth_response_contract() {
        let response = json!({
            "token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9...",
            "user": {
                "user_id": "550e8400-e29b-41d4-a716-446655440000",
                "username": "alice",
                "email": "alice@example.com",
                "reputation_score": 500.0,
                "role": "user",
                "created_at": "2024-01-15T10:00:00Z"
            }
        });

        // Verify required fields exist
        assert!(response["token"].is_string());
        assert!(response["user"]["user_id"].is_string());
        assert!(response["user"]["username"].is_string());
        assert!(response["user"]["reputation_score"].is_number());
    }

    #[test]
    fn test_token_response_contract() {
        let response = json!({
            "token_id": "550e8400-e29b-41d4-a716-446655440001",
            "issuer_id": "550e8400-e29b-41d4-a716-446655440000",
            "symbol": "ALICE",
            "name": "Alice Token",
            "description": "Support Alice's creative work",
            "current_supply": 1000.0,
            "current_price_btc": 0.00001,
            "status": "active",
            "created_at": "2024-01-15T10:00:00Z"
        });

        // Verify token contract
        assert!(response["token_id"].is_string());
        assert!(response["issuer_id"].is_string());
        assert!(response["symbol"].is_string());
        assert!(response["name"].is_string());
        assert!(response["current_supply"].is_number());
        assert!(response["current_price_btc"].is_number());
        assert!(response["status"].is_string());
        assert!(response["created_at"].is_string());
    }

    #[test]
    fn test_order_response_contract() {
        let response = json!({
            "order_id": "550e8400-e29b-41d4-a716-446655440002",
            "user_id": "550e8400-e29b-41d4-a716-446655440000",
            "token_id": "550e8400-e29b-41d4-a716-446655440001",
            "order_type": "buy",
            "amount": 100.0,
            "price_btc": 0.001,
            "status": "pending",
            "btc_address": "bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh",
            "created_at": "2024-01-15T10:00:00Z"
        });

        // Verify order contract
        assert!(response["order_id"].is_string());
        assert!(response["user_id"].is_string());
        assert!(response["token_id"].is_string());
        assert!(response["order_type"].is_string());
        assert!(response["amount"].is_number());
        assert!(response["price_btc"].is_number());
        assert!(response["status"].is_string());
    }

    #[test]
    fn test_error_response_contract() {
        let response = json!({
            "error": "validation_error",
            "message": "Email is required",
            "details": null
        });

        // Verify error contract
        assert!(response["error"].is_string());
        assert!(response["message"].is_string());
        assert!(response.get("details").is_some());
    }

    #[test]
    fn test_pagination_contract() {
        let response = json!({
            "tokens": [],
            "total": 100,
            "page": 1,
            "per_page": 20
        });

        // Verify pagination contract
        assert!(response["tokens"].is_array());
        assert!(response["total"].is_number());
        assert!(response["page"].is_number());
        assert!(response["per_page"].is_number());
    }

    #[test]
    fn test_health_check_contract() {
        let response = json!({
            "status": "healthy"
        });

        assert!(response["status"].is_string());
        assert_eq!(response["status"], "healthy");
    }

    #[test]
    fn test_detailed_health_contract() {
        let response = json!({
            "status": "healthy",
            "database": "connected",
            "db_latency_ms": 5,
            "db_connections_active": 2,
            "db_connections_idle": 8
        });

        assert!(response["status"].is_string());
        assert!(response["database"].is_string());
        assert!(response["db_latency_ms"].is_number());
        assert!(response["db_connections_active"].is_number());
        assert!(response["db_connections_idle"].is_number());
    }

    /// Test API versioning contract
    #[test]
    fn test_api_version_header_contract() {
        // API should support version headers
        let version_header = "application/vnd.kaccy.v1+json";
        assert!(version_header.contains("vnd.kaccy"));
        assert!(version_header.contains("v1"));
    }

    /// Test that field types remain consistent
    #[test]
    fn test_field_type_consistency() {
        // UUIDs should be strings
        let uuid = "550e8400-e29b-41d4-a716-446655440000";
        assert!(uuid.len() == 36);
        assert!(uuid.contains('-'));

        // Timestamps should be ISO 8601
        let timestamp = "2024-01-15T10:00:00Z";
        assert!(timestamp.contains('T'));
        assert!(timestamp.contains('Z'));

        // BTC amounts should be floats
        let btc_amount: f64 = 0.00001;
        assert!(btc_amount > 0.0);
    }

    /// Test enum value contracts
    #[test]
    fn test_enum_value_contracts() {
        // Order types
        let order_types = ["buy", "sell"];
        assert!(order_types.contains(&"buy"));
        assert!(order_types.contains(&"sell"));

        // Order statuses
        let order_statuses = ["pending", "completed", "cancelled", "expired"];
        assert!(order_statuses.contains(&"pending"));
        assert!(order_statuses.contains(&"completed"));

        // User roles
        let roles = ["user", "admin"];
        assert!(roles.contains(&"user"));
        assert!(roles.contains(&"admin"));

        // Token statuses
        let token_statuses = ["active", "paused", "archived"];
        assert!(token_statuses.contains(&"active"));
    }

    /// Test that optional fields can be null
    #[test]
    fn test_optional_fields_contract() {
        let response = json!({
            "user_id": "550e8400-e29b-41d4-a716-446655440000",
            "username": "alice",
            "display_name": null,
            "bio": null,
            "avatar_url": null,
            "reputation_score": 500.0,
            "role": "user",
            "created_at": "2024-01-15T10:00:00Z"
        });

        // Optional fields should be present but can be null
        assert!(response.get("display_name").is_some());
        assert!(response.get("bio").is_some());
        assert!(response.get("avatar_url").is_some());
        assert!(response["display_name"].is_null());
    }

    /// Test backward compatibility
    #[test]
    fn test_backward_compatibility() {
        // Adding new optional fields should not break existing clients
        let old_response = json!({
            "user_id": "550e8400-e29b-41d4-a716-446655440000",
            "username": "alice",
            "reputation_score": 500.0
        });

        let new_response = json!({
            "user_id": "550e8400-e29b-41d4-a716-446655440000",
            "username": "alice",
            "reputation_score": 500.0,
            "new_optional_field": "new_value"
        });

        // Old required fields should still exist in new response
        assert_eq!(old_response["user_id"], new_response["user_id"]);
        assert_eq!(old_response["username"], new_response["username"]);
        assert_eq!(
            old_response["reputation_score"],
            new_response["reputation_score"]
        );
    }

    /// Test rate limit headers contract
    #[test]
    fn test_rate_limit_headers_contract() {
        // Rate limit headers should follow standard format
        let headers = vec![
            "X-RateLimit-Limit",
            "X-RateLimit-Remaining",
            "X-RateLimit-Reset",
        ];

        for header in headers {
            assert!(header.starts_with("X-RateLimit-"));
        }
    }

    /// Test CORS headers contract
    #[test]
    fn test_cors_headers_contract() {
        let cors_headers = vec![
            "Access-Control-Allow-Origin",
            "Access-Control-Allow-Methods",
            "Access-Control-Allow-Headers",
        ];

        for header in cors_headers {
            assert!(header.starts_with("Access-Control-"));
        }
    }

    /// Test WebSocket message contract
    #[test]
    fn test_websocket_message_contract() {
        let price_update = json!({
            "type": "price_update",
            "token_id": "550e8400-e29b-41d4-a716-446655440001",
            "price_btc": 0.00001,
            "timestamp": "2024-01-15T10:00:00Z"
        });

        assert!(price_update["type"].is_string());
        assert_eq!(price_update["type"], "price_update");
        assert!(price_update["token_id"].is_string());
        assert!(price_update["price_btc"].is_number());

        let trade_notification = json!({
            "type": "trade",
            "token_id": "550e8400-e29b-41d4-a716-446655440001",
            "amount": 100.0,
            "price_btc": 0.00001,
            "timestamp": "2024-01-15T10:00:00Z"
        });

        assert_eq!(trade_notification["type"], "trade");
        assert!(trade_notification["amount"].is_number());
    }

    /// Test commitment status values
    #[test]
    fn test_commitment_status_contract() {
        let statuses = ["pending", "submitted", "verified", "rejected"];
        assert!(statuses.contains(&"pending"));
        assert!(statuses.contains(&"verified"));
        assert!(statuses.contains(&"rejected"));
    }

    /// Test portfolio response contract
    #[test]
    fn test_portfolio_contract() {
        let portfolio = json!({
            "user_id": "550e8400-e29b-41d4-a716-446655440000",
            "holdings": [
                {
                    "token_id": "550e8400-e29b-41d4-a716-446655440001",
                    "symbol": "ALICE",
                    "balance": 100.0,
                    "current_price_btc": 0.00001,
                    "current_value_btc": 0.001,
                    "cost_basis_btc": 0.0008,
                    "profit_loss_btc": 0.0002
                }
            ],
            "total_value_btc": 0.001
        });

        assert!(portfolio["user_id"].is_string());
        assert!(portfolio["holdings"].is_array());
        assert!(portfolio["total_value_btc"].is_number());

        let holding = &portfolio["holdings"][0];
        assert!(holding["token_id"].is_string());
        assert!(holding["symbol"].is_string());
        assert!(holding["balance"].is_number());
    }
}
