/**
 * Utility functions for building API payloads
 * Simplified: Backend auto-generates participants from approvers and spectators
 */

import { FormData, RequestTemplate } from '@/hooks/useCreateRequestForm';
import {
  CreateWorkflowPayload,
  UpdateWorkflowPayload,
} from '../types/createRequest.types';
import { buildApprovalLevels } from './approvalLevelBuilders';

/**
 * Build create workflow payload
 * Backend will auto-generate participants array from approvers and spectators
 */
export function buildCreatePayload(
  formData: FormData,
  selectedTemplate: RequestTemplate | null,
  user: any
): CreateWorkflowPayload {
  // Filter out spectators who are also approvers (backend will handle validation)
  const approverEmails = new Set(
    (formData.approvers || []).map((a: any) => a?.email?.toLowerCase()).filter(Boolean)
  );
  const filteredSpectators = (formData.spectators || []).filter(
    (s: any) => s?.email && !approverEmails.has(s.email.toLowerCase())
  );

  return {
    templateId: selectedTemplate?.id || null,
    templateType: selectedTemplate?.id === 'custom' ? 'CUSTOM' : 'TEMPLATE',
    title: formData.title,
    description: formData.description,
    priorityUi: formData.priority === 'express' ? 'express' : 'standard',
    approverCount: formData.approverCount || 1,
    approvers: (formData.approvers || []).map((a: any) => ({
      userId: a?.userId || '',
      email: a?.email || '',
      name: a?.name,
      tat: a?.tat || '',
      tatType: a?.tatType || 'hours',
    })),
    spectators: filteredSpectators.map((s) => ({
      email: s?.email || '',
    })),
    // Note: participants array is auto-generated by backend
    // No need to send it from frontend
  };
}

/**
 * Build update workflow payload
 * Backend will auto-generate participants array from approvalLevels
 */
export function buildUpdatePayload(
  formData: FormData,
  user: any,
  documentsToDelete: string[]
): UpdateWorkflowPayload {
  const approvalLevels = buildApprovalLevels(
    formData.approvers || [],
    formData.approverCount || 1
  );

  return {
    title: formData.title,
    description: formData.description,
    priority: formData.priority === 'express' ? 'EXPRESS' : 'STANDARD',
    approvalLevels,
    // Note: participants array is auto-generated by backend
    deleteDocumentIds: documentsToDelete.length > 0 ? documentsToDelete : undefined,
  };
}

/**
 * Validate approvers before submission
 * Simplified: Only check for valid emails (backend handles user lookup)
 */
export function validateApproversForSubmission(
  approvers: any[],
  approverCount: number
): { valid: boolean; message?: string } {
  const approversToCheck = approvers.slice(0, approverCount);
  
  // Check if all approvers have valid emails
  const hasMissingEmails = approversToCheck.some(
    (a: any) => !a?.email || !a.email.trim()
  );

  if (hasMissingEmails) {
    return {
      valid: false,
      message: 'Please provide email addresses for all approvers.',
    };
  }

  // Validate email format
  const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
  const hasInvalidEmails = approversToCheck.some(
    (a: any) => !emailRegex.test(a?.email || '')
  );

  if (hasInvalidEmails) {
    return {
      valid: false,
      message: 'Please provide valid email addresses for all approvers.',
    };
  }

  return { valid: true };
}