/**
 * Support Domain - Salesforce Provider Mapper
 *
 * Transform functions to convert raw Salesforce Case records to domain types.
 */

import { supportCaseSchema, type SupportCase } from "../../schema.js";
import type { SalesforceCaseRecord } from "./raw.types.js";
import {
  getStatusDisplayLabel,
  getPriorityDisplayLabel,
  SALESFORCE_CASE_STATUS,
  SALESFORCE_CASE_PRIORITY,
} from "./raw.types.js";

// ============================================================================
// Helper Functions
// ============================================================================

/**
 * Safely coerce a value to string or return undefined
 */
function ensureString(value: unknown): string | undefined {
  if (typeof value === "string" && value.length > 0) {
    return value;
  }
  return undefined;
}

/**
 * Get current ISO timestamp
 */
function nowIsoString(): string {
  return new Date().toISOString();
}

// ============================================================================
// Transform Functions
// ============================================================================

/**
 * Transform a raw Salesforce Case record to a portal SupportCase.
 *
 * Converts Salesforce API values (often in Japanese) to portal display labels (English).
 *
 * @param record - Raw Salesforce Case record from SOQL query
 * @returns Validated SupportCase domain object
 */
export function transformSalesforceCaseToSupportCase(record: SalesforceCaseRecord): SupportCase {
  // Get raw values
  const rawStatus = ensureString(record.Status) ?? SALESFORCE_CASE_STATUS.NEW;
  const rawPriority = ensureString(record.Priority) ?? SALESFORCE_CASE_PRIORITY.MEDIUM;

  return supportCaseSchema.parse({
    id: record.Id,
    caseNumber: record.CaseNumber,
    subject: ensureString(record.Subject) ?? "",
    // Convert Japanese SF values to English display labels
    status: getStatusDisplayLabel(rawStatus),
    priority: getPriorityDisplayLabel(rawPriority),
    category: ensureString(record.Type) ?? null,
    description: ensureString(record.Description) ?? "",
    createdAt: ensureString(record.CreatedDate) ?? nowIsoString(),
    updatedAt: ensureString(record.LastModifiedDate) ?? nowIsoString(),
    closedAt: ensureString(record.ClosedDate) ?? null,
  });
}

/**
 * Transform multiple Salesforce Case records to SupportCase array.
 *
 * @param records - Array of raw Salesforce Case records
 * @returns Array of validated SupportCase domain objects
 */
export function transformSalesforceCasesToSupportCases(
  records: SalesforceCaseRecord[]
): SupportCase[] {
  return records.map(transformSalesforceCaseToSupportCase);
}

/**
 * Build the SOQL SELECT fields for Case queries.
 *
 * Standard Salesforce Case fields based on org configuration.
 * Note: Type field is not accessible via API in this org.
 *
 * @param additionalFields - Optional additional fields to include
 * @returns Array of field names for SOQL SELECT clause
 */
export function buildCaseSelectFields(additionalFields: string[] = []): string[] {
  const baseFields = [
    // Core identifiers
    "Id",
    "CaseNumber",

    // Case content
    "Subject",
    "Description",

    // Picklist fields
    "Status",
    "Priority",
    "Origin",

    // Relationships
    "AccountId",
    "ContactId",
    "OwnerId",

    // Timestamps
    "CreatedDate",
    "LastModifiedDate",
    "ClosedDate",

    // Flags
    "IsEscalated",
  ];

  return [...new Set([...baseFields, ...additionalFields])];
}

/**
 * Build a SOQL query for fetching cases for an account.
 *
 * @param accountId - Salesforce Account ID
 * @param origin - Case origin to filter by (e.g., "Portal Website")
 * @param additionalFields - Optional additional fields to include
 * @returns SOQL query string
 */
export function buildCasesForAccountQuery(
  accountId: string,
  origin: string,
  additionalFields: string[] = []
): string {
  const fields = buildCaseSelectFields(additionalFields).join(", ");
  return `
    SELECT ${fields}
    FROM Case
    WHERE AccountId = '${accountId}' AND Origin = '${origin}'
    ORDER BY CreatedDate DESC
    LIMIT 100
  `.trim();
}

/**
 * Build a SOQL query for fetching a single case by ID.
 *
 * @param caseId - Salesforce Case ID
 * @param accountId - Salesforce Account ID (for ownership validation)
 * @param origin - Case origin to filter by
 * @param additionalFields - Optional additional fields to include
 * @returns SOQL query string
 */
export function buildCaseByIdQuery(
  caseId: string,
  accountId: string,
  origin: string,
  additionalFields: string[] = []
): string {
  const fields = buildCaseSelectFields(additionalFields).join(", ");
  return `
    SELECT ${fields}
    FROM Case
    WHERE Id = '${caseId}' AND AccountId = '${accountId}' AND Origin = '${origin}'
    LIMIT 1
  `.trim();
}