versa 1.9.0-rc3

//! Core protocol types for Versa communication.
//!
//! This module contains the fundamental types used in the Versa Protocol for
//! communication between senders (merchants) and receivers (inbox providers).
//!
//! ## Key Types
//!
//! - [`VersaMode`]: Environment mode (prod/test) for Versa operations
//! - [`TransactionHandles`]: Identifiers for routing receipts to the correct receivers
//! - [`ReceiptRegistrationRequest`]/[`ReceiptRegistrationResponse`]: Receipt registration flow
//! - [`Receiver`]/[`ReceiverInstruction`]: Receiver endpoint information
//! - [`Sender`]: Merchant/sender information with branding details
//! - [`Checkout`]: Receipt checkout information for receivers
//!
//! ## Submodules
//!
//! - [`customer_registration`]: Customer email verification and registration
//! - [`webhook`]: Webhook delivery payloads and events
//! - [`misuse`]: Misuse reporting functionality

use serde::{Deserialize, Serialize};
use std::fmt;
use webhook::TransactionEvent;

pub mod customer_registration;
pub mod event;
pub mod misuse;
pub mod webhook;

use std::hash::{Hash, Hasher};

#[cfg(feature = "diesel")]
use std::io::Write;

#[cfg(feature = "diesel")]
use diesel::deserialize::{self, FromSql, FromSqlRow};
#[cfg(feature = "diesel")]
use diesel::prelude::*;
#[cfg(feature = "diesel")]
use diesel::serialize::{self, IsNull, Output, ToSql};
#[cfg(feature = "diesel")]
use diesel::{expression::AsExpression, sql_types::Text};

#[cfg(feature = "diesel")]
use diesel::mysql::{Mysql, MysqlValue};

use crate::protocol::customer_registration::HandleType;
use crate::protocol::event::{EventType, InitialEventType, UpdateEventType};

/// Receiver category classification
#[derive(Clone, Debug, Deserialize, PartialEq, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum ReceiverCategory {
  /// Expense management receivers
  Expense,
  /// Firehose data receivers
  Firehose,
  /// Duty of care receivers
  DutyOfCare,
}

/// Filter for querying receivers
#[derive(Debug, Deserialize, Serialize)]
#[serde(rename_all = "snake_case")]
pub enum ReceiverFilter {
  /// Filter by receiver categories
  Category(Vec<ReceiverCategory>),
  /// Filter by regions
  Region(Vec<String>),
}

/// Public organization information
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct PublicOrg {
  /// Organization ID
  pub id: String,
  /// Organization name
  pub name: String,
  /// Legal name if different from display name
  pub legal_name: Option<String>,
  /// URL-friendly slug
  pub slug: String,
  /// Organization website
  pub website: String,
  /// Logo URL
  pub logo: Option<String>,
  /// Brand color in hex format
  pub brand_color: Option<String>,
  /// Stock ticker symbol
  pub stock_symbol: Option<String>,
  /// Twitter handle
  pub twitter: Option<String>,
  /// International Securities Identification Number
  pub isin: Option<String>,
  /// Legal Entity Identifier
  pub lei: Option<String>,
  /// North American Industry Classification System code
  pub naics: Option<String>,
  /// VAT registration number
  pub vat_number: Option<String>,
}

/// Information about how a receiver handles transactions
#[derive(Debug, Serialize, Deserialize)]
pub struct Handling {
  /// Whether the sender is registered with this receiver
  pub sender_registered: bool,
  /// Whether the receiver is registered in the system
  pub receiver_registered: bool,
}

/// Result of a receiver query
#[derive(Debug, Serialize, Deserialize)]
pub struct ReceiverQueryResult {
  /// Organization information
  pub org: PublicOrg,
  /// Receiver category
  pub category: ReceiverCategory,
  /// Handling information if transaction handles were provided
  pub handling: Option<Handling>,
}

/// Request body for querying receivers
#[derive(Debug, Deserialize, Serialize)]
pub struct ReceiverQueryRequest {
  /// Optional filters to apply
  pub filters: Option<Vec<ReceiverFilter>>,
  /// Optional transaction handles to check handling status
  pub handles: Option<TransactionHandles>,
}

/// Response from receiver query
#[derive(Debug, Serialize, Deserialize)]
pub struct ReceiverQueryResponse {
  /// The mode of the query (prod/test)
  pub mode: VersaMode,
  /// List of receivers matching the query
  pub receivers: Vec<ReceiverQueryResult>,
}

/// Environment mode for Versa operations.
///
/// Determines whether operations are performed in production or test mode.
/// Test mode is useful for development and testing without affecting real data.
///
/// # Example
///
/// ```rust
/// use versa::protocol::VersaMode;
///
/// let mode = VersaMode::Test;
/// assert_eq!(mode.to_string(), "test");
/// ```
#[derive(Clone, Debug, Deserialize, Eq, PartialEq, Serialize)]
#[serde(rename_all = "snake_case")]
#[cfg_attr(
  feature = "diesel",
  derive(diesel::expression::AsExpression, FromSqlRow)
)]
#[cfg_attr(feature = "diesel", diesel(sql_type = Text))]
pub enum VersaMode {
  /// Production environment - real receipts and transactions
  Prod,
  /// Test environment - for development and testing
  Test,
}

pub type VersaEnv = VersaMode;

impl fmt::Display for VersaMode {
  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
    let state = match self {
      VersaMode::Prod => "prod",
      VersaMode::Test => "test",
    };
    write!(f, "{}", state)
  }
}

#[cfg(feature = "diesel")]
impl ToSql<Text, Mysql> for VersaMode {
  fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Mysql>) -> diesel::serialize::Result {
    out.write_all(&*self.to_string().as_bytes())?;
    Ok(IsNull::No)
  }
}

#[cfg(feature = "diesel")]
impl FromSql<Text, Mysql> for VersaMode {
  fn from_sql(bytes: MysqlValue<'_>) -> diesel::deserialize::Result<Self> {
    match bytes.as_bytes() {
      b"prod" => Ok(VersaMode::Prod),
      b"test" => Ok(VersaMode::Test),
      _ => Err("Unrecognized VersaMode enum variant".into()),
    }
  }
}

/// Identifiers for routing receipts to the correct receivers.
///
/// Transaction handles help the Versa registry determine which receivers
/// should get a copy of a receipt. Multiple handles can be provided to
/// ensure proper delivery.
///
/// # Example
///
/// ```rust
/// use versa::protocol::TransactionHandles;
///
/// let handles = TransactionHandles::new()
///     .with_customer_email("customer@example.com".to_string())
///     .with_merchant_user_code("USER123".to_string());
/// ```
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct TransactionHandles {
  /// Customer's email address
  pub customer_email: Option<String>,
  /// Domain of the customer's email (e.g., "example.com")
  pub customer_email_domain: Option<String>,
  /// Merchant's group code for multi-location businesses
  pub merchant_group_code: Option<String>,
  /// Merchant's user/customer code
  pub merchant_user_code: Option<String>,
  /// EXPERIMENTAL - Legacy client IDs
  pub versa_client_ids: Option<Vec<String>>,
  /// Organization IDs that should receive this receipt
  pub versa_org_ids: Option<Vec<String>>,
}

impl TransactionHandles {
  pub fn new() -> Self {
    Self {
      customer_email: None,
      customer_email_domain: None,
      merchant_group_code: None,
      merchant_user_code: None,
      versa_client_ids: None,
      versa_org_ids: None,
    }
  }

  pub fn with_customer_email(mut self, email_address: String) -> Self {
    self.customer_email = Some(email_address);
    self
  }

  pub fn with_customer_email_domain(mut self, domain: String) -> Self {
    self.customer_email_domain = Some(domain);
    self
  }

  pub fn with_merchant_group_code(mut self, group_code: String) -> Self {
    self.merchant_group_code = Some(group_code);
    self
  }

  pub fn with_merchant_user_code(mut self, user_code: String) -> Self {
    self.merchant_user_code = Some(user_code);
    self
  }

  #[deprecated(since = "0.28.0", note = "please use `with_versa_org_ids` instead")]
  pub fn with_versa_client_ids(mut self, ids: Vec<String>) -> Self {
    self.versa_client_ids = Some(ids);
    self
  }

  pub fn with_versa_org_ids(mut self, ids: Vec<String>) -> Self {
    self.versa_org_ids = Some(ids);
    self
  }

  pub fn iter(&self) -> TransactionHandlesIter<'_> {
    TransactionHandlesIter {
      handles: self,
      position: 0,
    }
  }
}

pub struct TransactionHandlesIter<'a> {
  handles: &'a TransactionHandles,
  position: usize,
}

impl<'a> Iterator for TransactionHandlesIter<'a> {
  type Item = (&'static HandleType, &'a str);

  fn next(&mut self) -> Option<Self::Item> {
    loop {
      match self.position {
        0 => {
          self.position += 1;
          if let Some(ref value) = self.handles.customer_email {
            return Some((&HandleType::CustomerEmail, value));
          }
        }
        1 => {
          self.position += 1;
          if let Some(ref value) = self.handles.customer_email_domain {
            return Some((&HandleType::CustomerEmailDomain, value));
          }
        }
        2 => {
          self.position += 1;
          if let Some(ref value) = self.handles.merchant_group_code {
            return Some((&HandleType::MerchantGroupCode, value));
          }
        }
        3 => {
          self.position += 1;
          if let Some(ref value) = self.handles.merchant_user_code {
            return Some((&HandleType::MerchantUserCode, value));
          }
        }
        _ => return None,
      }
    }
  }
}

impl<'a> IntoIterator for &'a TransactionHandles {
  type Item = (&'static HandleType, &'a str);
  type IntoIter = TransactionHandlesIter<'a>;

  fn into_iter(self) -> Self::IntoIter {
    self.iter()
  }
}
#[derive(Debug, Deserialize, Serialize)]
pub struct ClientMetadata {
  pub client_string: Option<String>,
}

/// Request to register a receipt with the Versa registry.
///
/// This is the first step in sending a receipt through Versa. The registry
/// will respond with encryption keys and receiver endpoints.
///
/// # Example
///
/// ```rust
/// use versa::protocol::{EventRegistrationRequest, TransactionHandles, event::EventType};
///
/// let request = EventRegistrationRequest {
///     event_type: Some(EventType::Receipt),
///     schema_version: "2.2.0".to_string(),
///     handles: Some(TransactionHandles::new()
///         .with_customer_email("customer@example.com".to_string())),
///     transaction_id: None,
///     client_metadata: None,
///     transaction_event_filter: None,
/// };
/// ```
#[derive(Debug, Deserialize, Serialize)]
pub struct EventRegistrationRequest {
  /// The schema version of the receipt (e.g., "2.2.0")
  pub schema_version: String,
  /// Provide as many handles as available to ensure the receipt is routed to the correct receivers
  pub handles: Option<TransactionHandles>,
  /// The Versa Transaction ID, if updating an existing receipt
  pub transaction_id: Option<String>,
  /// Client software metadata, such as the client_string
  pub client_metadata: Option<ClientMetadata>,
  /// Specify the event type for this registration. If left blank, the registry will default to 'receipt'
  pub event_type: Option<EventType>,
  /// Filter receivers by the specific transaction event data you are prepared to send
  pub transaction_event_filter: Option<TransactionEvent>,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct InitialEventRegistrationRequest {
  /// The schema version of the receipt (e.g., "2.2.0")
  pub schema_version: String,
  /// Provide as many handles as available to ensure the receipt is routed to the correct receivers
  pub handles: TransactionHandles,
  /// Client software metadata, such as the client_string
  pub client_metadata: Option<ClientMetadata>,
  /// Specify the event type for this registration
  pub event_type: InitialEventType,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct UpdateEventRegistrationRequest {
  /// The schema version of the receipt (e.g., "2.2.0")
  pub schema_version: String,
  /// The Versa Transaction ID, which is required for update events
  pub transaction_id: String,
  /// Client software metadata, such as the client_string
  pub client_metadata: Option<ClientMetadata>,
  /// Specify the event type for this registration. If left blank, the registry will default to 'receipt'
  pub event_type: UpdateEventType,
}

pub type ReceiptRegistrationRequest = EventRegistrationRequest;

/// Information about a receipt receiver.
///
/// Contains the endpoint and authentication details needed to deliver
/// receipts to a receiver. The receiver's endpoint URL and secret are
/// used to construct webhook deliveries.
#[derive(Debug, Deserialize, Serialize)]
pub struct Receiver {
  /// Versa Org ID of the receiver
  pub org_id: String,
  /// Secret key for HMAC authentication
  pub secret: String,
  /// Webhook endpoint URL
  pub endpoint_url: String,
  /// DEPRECATED: use `endpoint_url` instead
  pub address: String,
  /// DEPRECATED: use `org_id` instead
  pub client_id: String,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct ReceiverInstruction {
  pub endpoint_url: String,
  pub event_id: String,
  pub event_type: EventType,
  pub org_id: String,
  pub org_name: String,
  pub secret: String,
  /// DEPRECATED: use `endpoint_url` instead
  pub address: String,
  /// DEPRECATED: use `org_id` instead
  pub client_id: String,
}

/// A receiver object is hashed by its client_id — the receiver address, secret, and org_id are considered constant and non-configurable.
/// It is possible for a receiver to change their address and rotate their secret with the registry,
/// in which case any Receiver records returned by said registry will contain the updated values.
/// Assembling hash sets of outdated and new receiver objects could result in unexpected behavior—do not do store or cache receivers.
impl Hash for Receiver {
  fn hash<H: Hasher>(&self, state: &mut H) {
    self.org_id.hash(state);
    self.endpoint_url.hash(state);
  }
}

impl PartialEq for Receiver {
  fn eq(&self, other: &Self) -> bool {
    self.org_id == other.org_id && self.endpoint_url == other.endpoint_url
  }
}
impl Eq for Receiver {}

impl Hash for ReceiverInstruction {
  fn hash<H: Hasher>(&self, state: &mut H) {
    self.org_id.hash(state);
    self.endpoint_url.hash(state);
    self.event_id.hash(state);
  }
}

impl PartialEq for ReceiverInstruction {
  fn eq(&self, other: &Self) -> bool {
    self.event_id == other.event_id
  }
}
impl Eq for ReceiverInstruction {}

/// Response from the Versa registry after registering a receipt.
///
/// Contains all the information needed to encrypt and deliver the receipt
/// to the appropriate receivers.
///
/// # Example
///
/// ```rust
/// # use versa::protocol::ReceiptRegistrationResponse;
/// # fn example(response: ReceiptRegistrationResponse) {
/// let (encryption_key, summary, receivers) = response.ready_for_delivery();
///
/// // Use encryption_key to encrypt the receipt
/// // Deliver to each receiver in the receivers list
/// # }
/// ```
#[derive(Debug, Deserialize, Serialize)]
pub struct ReceiptRegistrationResponse {
  /// Network mode for the registration ('prod' or 'test')
  pub mode: VersaMode,
  /// Unique ID for this receipt
  pub receipt_id: String,
  /// Transaction ID for tracking
  pub transaction_id: String,
  /// List of receivers to deliver to
  pub receivers: Vec<ReceiverInstruction>,
  /// Key for encrypting the receipt; this will be retrieved by authorized receivers
  pub encryption_key: String,
  /// DEPRECATED: use `mode` instead
  pub env: VersaMode,
}

#[derive(Clone, Debug)]
pub struct ReceiptRegistrationSummary {
  pub mode: VersaMode,
  pub receipt_id: String,
  pub transaction_id: String,
}

/// Response from the Versa registry after registering a receipt.
///
/// Contains all the information needed to encrypt and deliver the receipt
/// to the appropriate receivers.
///
/// # Example
///
/// ```rust
/// # use versa::protocol::EventRegistrationResponse;
/// # fn example(response: EventRegistrationResponse) {
/// let (encryption_key, summary, receivers) = response.ready_for_delivery();
///
/// // Use encryption_key to encrypt the receipt
/// // Deliver to each receiver in the receivers list
/// # }
/// ```
#[derive(Debug, Deserialize, Serialize)]
pub struct EventRegistrationResponse {
  /// Network mode for the registration ('prod' or 'test')
  pub mode: VersaMode,
  /// Unique ID for this event
  pub event_id: String,
  /// Unique ID for this receipt
  pub receipt_id: String,
  /// Transaction ID for tracking
  pub transaction_id: String,
  /// List of receivers to deliver to
  pub receivers: Vec<ReceiverInstruction>,
  /// Key for encrypting the receipt; this will be retrieved by authorized receivers
  pub encryption_key: String,
  /// DEPRECATED: use `mode` instead
  pub env: VersaMode,
}

#[derive(Clone, Debug)]
pub struct EventRegistrationSummary {
  pub mode: VersaMode,
  pub event_id: String,
  pub receipt_id: String,
  pub transaction_id: String,
}

#[derive(Clone, Debug)]
pub struct EncryptionKey(pub String);

impl From<ReceiptRegistrationSummary> for EventRegistrationSummary {
  fn from(summary: ReceiptRegistrationSummary) -> Self {
    EventRegistrationSummary {
      mode: summary.mode,
      event_id: summary.receipt_id.clone(),
      receipt_id: summary.receipt_id,
      transaction_id: summary.transaction_id,
    }
  }
}

impl EventRegistrationResponse {
  pub fn ready_for_delivery(
    self,
  ) -> (
    EncryptionKey,
    EventRegistrationSummary,
    Vec<ReceiverInstruction>,
  ) {
    let EventRegistrationResponse {
      mode,
      event_id,
      receipt_id,
      transaction_id,
      receivers,
      encryption_key,
      env: _env,
    } = self;
    let summary = EventRegistrationSummary {
      mode,
      event_id,
      receipt_id,
      transaction_id,
    };
    (EncryptionKey(encryption_key), summary, receivers)
  }
}

impl ReceiptRegistrationResponse {
  pub fn ready_for_delivery(
    self,
  ) -> (
    EncryptionKey,
    ReceiptRegistrationSummary,
    Vec<ReceiverInstruction>,
  ) {
    let ReceiptRegistrationResponse {
      mode,
      receipt_id,
      transaction_id,
      receivers,
      encryption_key,
      env: _env,
    } = self;
    let summary = ReceiptRegistrationSummary {
      mode,
      receipt_id,
      transaction_id,
    };
    (EncryptionKey(encryption_key), summary, receivers)
  }
}

// Receiver structs

#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Address {
  pub street_address: Option<String>,
  pub city: Option<String>,
  pub region: Option<String>,
  pub country: String,
  pub postal_code: Option<String>,
  pub tz: Option<String>,
}

/// Information about the sender (merchant) of a receipt.
///
/// Contains branding and identification information that helps receivers
/// properly display and attribute receipts.
///
/// # Example
///
/// ```rust
/// use versa::protocol::Sender;
///
/// let sender = Sender {
///     org_id: "org_123".to_string(),
///     name: "Example Store".to_string(),
///     website: "https://example.com".to_string(),
///     brand_color: Some("#0066cc".to_string()),
///     legal_name: Some("Example Store Inc.".to_string()),
///     logo: Some("https://example.com/logo.png".to_string()),
///     vat_number: None,
///     address: None,
/// };
/// ```
#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Sender {
  /// Organization ID in the Versa registry
  pub org_id: String,
  /// Display name of the sender
  pub name: String,
  /// Sender's website URL
  pub website: String,
  /// Brand color in hex format (e.g., "#0066cc")
  pub brand_color: Option<String>,
  /// Legal entity name
  pub legal_name: Option<String>,
  /// Logo URL
  pub logo: Option<String>,
  /// VAT/tax number
  pub vat_number: Option<String>,
  /// Business address
  pub address: Option<Address>,
}

#[derive(Clone, Debug, Deserialize, Serialize)]
pub struct Checkout {
  pub key: String,
  pub receipt_id: String,
  pub schema_version: String,
  pub transaction_id: String,
  pub sender: Option<Sender>,
  pub handles: TransactionHandles,
  pub registered_at: i64,
  pub transaction_event_index: u8,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct Envelope {
  pub encrypted: String,
  pub nonce: String,
}

#[derive(Deserialize, Serialize)]
pub struct ReceiverPayload {
  pub sender_client_id: String,
  pub receipt_id: String,
  pub envelope: Envelope,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct CheckoutRequest {
  /// The receipt_id that came with the delivery
  pub receipt_id: String,
  /// Client software metadata, such as the client_string
  pub client_metadata: Option<ClientMetadata>,
}

#[cfg(test)]
mod tests {
  use crate::protocol::{customer_registration::HandleType, event::InitialEventType};

  #[test]
  fn test_versa_env_display() {
    use super::VersaMode;
    assert_eq!(VersaMode::Prod.to_string(), "prod");
    assert_eq!(VersaMode::Test.to_string(), "test");
  }

  #[test]
  fn test_hash_sets_of_receivers() {
    use super::Receiver;
    use std::collections::HashSet;
    let mut set = HashSet::new();
    set.insert(Receiver {
      address: "foobar".to_string(),
      endpoint_url: "https://example.com".to_string(),
      client_id: "versa_cid_xyz".to_string(),
      org_id: "org_aaa".to_string(),
      secret: "flargh".to_string(),
    });
    assert_eq!(set.len(), 1);
    set.insert(Receiver {
      address: "bazbat".to_string(),
      endpoint_url: "https://example.com".to_string(),
      client_id: "versa_cid_abc".to_string(),
      org_id: "org_aaa".to_string(),
      secret: "blargh".to_string(),
    });
    assert_eq!(set.len(), 1);
    assert!(set.into_iter().next().unwrap().org_id == "org_aaa");
  }

  #[test]
  fn test_transaction_handles_iter() {
    use super::TransactionHandles;

    let handles = TransactionHandles::new()
      .with_customer_email("test@example.com".to_string())
      .with_merchant_group_code("GROUP123".to_string())
      .with_versa_org_ids(vec!["org1".to_string(), "org2".to_string()]);

    let items: Vec<_> = handles.iter().collect();
    assert_eq!(items.len(), 2);
    assert_eq!(items[0], (&HandleType::CustomerEmail, "test@example.com"));
    assert_eq!(items[1], (&HandleType::MerchantGroupCode, "GROUP123"));
  }

  #[test]
  fn test_transaction_handles_into_iter() {
    use super::TransactionHandles;

    let handles = TransactionHandles::new()
      .with_customer_email_domain("example.com".to_string())
      .with_merchant_user_code("USER456".to_string());

    let items: Vec<_> = (&handles).into_iter().collect();
    assert_eq!(items.len(), 2);
    assert_eq!(items[0], (&HandleType::CustomerEmailDomain, "example.com"));
    assert_eq!(items[1], (&HandleType::MerchantUserCode, "USER456"));
  }

  #[test]
  fn test_initial_event_type_serializes_to_valid_event_type() {
    use super::event::{EventType, InitialEventType};
    use strum::IntoEnumIterator;

    // Test all InitialEventType variants can serialize/deserialize to EventType
    for update_event in InitialEventType::iter() {
      let serialized = serde_json::to_string(&update_event).unwrap();
      let deserialized_result: Result<EventType, _> = serde_json::from_str(&serialized);
      assert!(
        deserialized_result.is_ok(),
        "InitialEventType::{:?} failed to deserialize into EventType",
        update_event
      );
    }
  }
  #[test]
  fn test_update_event_type_serializes_to_valid_event_type() {
    use super::event::{EventType, UpdateEventType};
    use strum::IntoEnumIterator;

    // Test all UpdateEventType variants can serialize/deserialize to EventType
    for update_event in UpdateEventType::iter() {
      let serialized = serde_json::to_string(&update_event).unwrap();
      let deserialized_result: Result<EventType, _> = serde_json::from_str(&serialized);
      assert!(
        deserialized_result.is_ok(),
        "UpdateEventType::{:?} failed to deserialize into EventType",
        update_event
      );
    }
  }

  #[test]
  fn test_initial_event_type_from_conversion() {
    use super::event::{EventType, InitialEventType};
    use strum::IntoEnumIterator;

    // Test all InitialEventType variants convert to EventType
    for initial_event in InitialEventType::iter() {
      let event_type: EventType = initial_event.clone().into();
      // Verify the conversion maintains the same serialized representation
      let initial_serialized = serde_json::to_string(&initial_event).unwrap();
      let event_serialized = serde_json::to_string(&event_type).unwrap();
      assert_eq!(
        initial_serialized, event_serialized,
        "InitialEventType::{:?} conversion to EventType changed serialization",
        initial_event
      );
    }
  }

  #[test]
  fn test_update_event_type_from_conversion() {
    use super::event::{EventType, UpdateEventType};
    use strum::IntoEnumIterator;

    // Test all UpdateEventType variants convert to EventType
    for update_event in UpdateEventType::iter() {
      let event_type: EventType = update_event.clone().into();
      // Verify the conversion maintains the same serialized representation
      let update_serialized = serde_json::to_string(&update_event).unwrap();
      let event_serialized = serde_json::to_string(&event_type).unwrap();
      assert_eq!(
        update_serialized, event_serialized,
        "UpdateEventType::{:?} conversion to EventType changed serialization",
        update_event
      );
    }
  }

  #[test]
  fn test_event_registration_request_variants_serialize_correctly() {
    use super::event::UpdateEventType;
    use super::webhook::TransactionEvent;
    use super::{
      EventRegistrationRequest, InitialEventRegistrationRequest, TransactionHandles,
      UpdateEventRegistrationRequest,
    };

    // Test InitialEventRegistrationRequest serializes to EventRegistrationRequest
    let initial_request = InitialEventRegistrationRequest {
      schema_version: "2.2.0".to_string(),
      handles: TransactionHandles::new().with_customer_email("test@example.com".to_string()),
      client_metadata: None,
      event_type: InitialEventType::Receipt,
    };
    let serialized = serde_json::to_string(&initial_request).unwrap();
    let deserialized: EventRegistrationRequest = serde_json::from_str(&serialized).unwrap();
    assert_eq!(deserialized.schema_version, "2.2.0");
    assert!(deserialized.handles.is_some());
    assert!(deserialized.transaction_id.is_none());

    // Test UpdateEventRegistrationRequest serializes to EventRegistrationRequest
    let update_request = UpdateEventRegistrationRequest {
      schema_version: "2.2.0".to_string(),
      transaction_id: "txn_123".to_string(),
      client_metadata: None,
      event_type: UpdateEventType::TransitRouteStatusUpdated,
    };
    let serialized = serde_json::to_string(&update_request).unwrap();
    let deserialized: EventRegistrationRequest = serde_json::from_str(&serialized).unwrap();
    assert_eq!(deserialized.schema_version, "2.2.0");
    assert_eq!(deserialized.transaction_id, Some("txn_123".to_string()));
  }

  #[test]
  fn test_receipt_registration_summary_to_event_registration_summary() {
    use super::{EventRegistrationSummary, ReceiptRegistrationSummary, VersaMode};

    let receipt_summary = ReceiptRegistrationSummary {
      mode: VersaMode::Test,
      receipt_id: "rcpt_123".to_string(),
      transaction_id: "txn_456".to_string(),
    };

    let event_summary: EventRegistrationSummary = receipt_summary.clone().into();

    assert_eq!(event_summary.mode, VersaMode::Test);
    assert_eq!(event_summary.receipt_id, "rcpt_123");
    assert_eq!(event_summary.event_id, "rcpt_123");
    assert_eq!(event_summary.transaction_id, "txn_456");
  }
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Org {
  pub id: String,
  pub name: String,
  pub slug: String,
  pub website: String,
  pub logo: Option<String>,
  pub brand_color: Option<String>,
  pub stock_symbol: Option<String>,
  pub twitter: Option<String>,
  pub isin: Option<String>,
  pub lei: Option<String>,
  pub naics: Option<String>,
  pub vat_number: Option<String>,
  pub created: i64,
}

#[derive(Debug, Deserialize, Serialize, PartialEq, Eq)]
#[serde(rename_all = "snake_case")]
pub enum CustomerRefManagedBy {
  /// This reference was configured by the sender; if the sender deregisters it, receipts matching this handle will no longer be sent to the receiver.
  Sender,
  /// This reference was configured by the receiver; the sender cannot deregister it.
  Receiver,
  /// This reference was configured by both the sender and the receiver; if the sender deregisters it, receipts matching this handle will still be sent to the receiver, unless it is also disabled by the receiving client.
  Both,
}

/// **DEPRECATED**: This struct is deprecated and will be removed in a future version.
///
/// Response from the registry for check_registry API calls. This endpoint is being
/// deprecated as part of API simplification.
#[deprecated(
  since = "1.2.0",
  note = "The CheckRegistryResponse struct is deprecated and will be removed in a future version"
)]
#[derive(Deserialize, Serialize)]
pub struct CheckRegistryResponse {
  pub mode: VersaMode,
  /// DEPRECATED: use 'mode' instead
  pub env: VersaMode,
  pub receivers: Vec<ReceiverInfo>,
}

#[deprecated(
  since = "1.2.0",
  note = "The ReceiverInfo struct is deprecated and will be removed in a future version; use ReceiverQueryResult instead"
)]
#[derive(Debug, Deserialize, Serialize)]
pub struct ReceiverInfo {
  pub client_id: String,
  pub receiver: Option<Org>,
  pub managed_by: CustomerRefManagedBy,
}

#[derive(Debug, Deserialize, Serialize)]
pub struct AssetRegistrationResponse {
  pub asset_id: String,
}