/**
 * Represents a component that can be interpolated into translations
 * Used with react-i18next Trans component for proper i18n support (RTL, word order, etc.)
 */
export type TranslationComponent = {
  type: "link";
  href: string;
};

/**
 * Represents a translation key with optional interpolation params and components
 * Used for dynamic display titles that need to be translated with context
 * Components are used for clickable links within translations (e.g., "Rescheduled to <1>New Booking</1>")
 */
export type TranslationWithParams = {
  key: string;
  params?: Record<string, string | number>;
  components?: TranslationComponent[];
};

import type { EnrichmentDataStore, DataRequirements } from "../service/EnrichmentDataStore";

/**
 * This is agnostic of the action and is common for all actions
 */
export type BaseStoredAuditData = {
  version: number;
  fields: Record<string, unknown>;
};

export type GetDisplayJsonParams = {
  storedData: BaseStoredAuditData;
  userTimeZone: string;
};

export type GetDisplayTitleParams = {
  storedData: BaseStoredAuditData;
  userTimeZone: string;
  dbStore: EnrichmentDataStore;
};

export type GetDisplayFieldsParams = {
  storedData: BaseStoredAuditData;
  dbStore: EnrichmentDataStore;
};

/**
 * Discriminated union for display field values
 * Each variant represents a different way to render the field value
 */
export type DisplayFieldValue =
  | { type: "translationKey"; valueKey: string }
  | { type: "rawValue"; value: string }
  | { type: "rawValues"; values: string[] }
  | { type: "translationsWithParams"; valuesWithParams: TranslationWithParams[] };

export type DisplayField = {
  labelKey: string;
  fieldValue: DisplayFieldValue;
};

/**
 * Interface for Audit Action Services
 *
 * Defines the contract that all audit action services must implement.
 * Uses composition with AuditActionServiceHelper to provide common functionality
 * while maintaining runtime type safety through Zod schema validation.
 *
 * All methods use common base types at the interface level, while implementations
 * validate to their specific schemas internally.
 */
export interface IAuditActionService {
  /**
   * Current version number for this action type
   */
  readonly VERSION: number;

  /**
   * Parse given fields against latest schema and wrap with version
   * @param fields - Raw input fields (just the audit fields)
   * @returns Parsed data with version wrapper { version, fields }
   */
  getVersionedData(fields: unknown): BaseStoredAuditData;

  /**
   * Parse stored audit record (includes version wrapper)
   * Accepts data from ANY supported version (not just latest) for backward compatibility
   * @param data - Stored data from database (can be any version)
   * @returns Parsed stored data { version, fields } - version may differ from current VERSION
   */
  parseStored(data: unknown): BaseStoredAuditData;

  /**
   * Extract version number from stored data
   * @param data - Stored data from database
   * @returns Version number
   */
  getVersion(data: unknown): number;

  /**
   * Get flattened JSON data for display (fields only, no version wrapper)
   * Optional - implement only if custom display formatting is needed
   * @param params - Object containing storedData and userTimeZone
   * @param params.storedData - Parsed stored data { version, fields }
   * @param params.userTimeZone - User's timezone for datetime formatting (required)
   * @returns The fields object without version wrapper and we decide what fields to show to the client
   */
  getDisplayJson?(params: GetDisplayJsonParams): Record<string, unknown>;

  /**
   * Declare what data this action needs from DB
   * Returns identifiers to be bulk-fetched before enrichment
   * @param storedData - Parsed stored data { version, fields }
   * @returns Data requirements with arrays of identifiers to fetch
   */
  getDataRequirements(storedData: BaseStoredAuditData): DataRequirements;

  /**
   * Get the display title for the audit action
   * Returns a translation key with optional interpolation params for dynamic titles
   * (e.g., "Booking reassigned to John Doe" instead of just "Reassignment")
   * @param params - Object containing storedData and userTimeZone
   * @param params.storedData - Parsed stored data { version, fields }
   * @param params.userTimeZone - User's timezone for date formatting (required)
   * @returns Translation key with optional interpolation params
   */
  getDisplayTitle(params: GetDisplayTitleParams): Promise<TranslationWithParams>;

  /**
   * Returns additional display fields with translation keys for frontend rendering
   * Optional - implement only if custom display fields are needed
   * @param params - Object containing storedData
   * @param params.storedData - Parsed stored data { version, fields }
   * @returns Promise of array of DisplayField objects with label and discriminated value type
   */
  getDisplayFields?(params: GetDisplayFieldsParams): Promise<DisplayField[]>;

  /**
   * Migrate old version data to latest version
   *
   * Required method that validates and migrates data to latest schema version.
   * For V1-only actions, simply validates and returns with isMigrated=false.
   * For multi-version actions, checks version and transforms if needed.
   *
   * @param data - Data from task payload (any supported version)
   * @returns Migration result with status and latest data
   */
  migrateToLatest(data: unknown): {
    /**
     * True if migration was performed, false if already latest
     */
    isMigrated: boolean;
    /**
     * Always set, either migrated or original
     */
    latestData: Record<string, unknown>;
  };
}