"use server";

import { auth } from "@/auth";
import { prisma } from "@/lib/db/prisma";
import { Permission } from "@/generated/prisma/enums";
import { assertOwnerPermission, OwnerPermissionDeniedError } from "@/features/owner/authorization";
import { writeAuditLog } from "@/lib/audit/write-audit-log";
import {
  setOpeningHours,
  updateBusinessProfile,
  updateBusinessSettings,
} from "@/services/business/business.service";
import type { BusinessLocationInput, BusinessProfileInput, BusinessSettingsInput, OpeningHoursDayInput } from "@/services/business/business.service";

export interface BusinessActionResult {
  success: boolean;
  error?: string;
}

async function requireBusinessManager() {
  const session = await auth();
  if (!session?.user) return { staff: null, error: "You must be signed in." } as const;

  try {
    await assertOwnerPermission(session.user.id, Permission.MANAGE_BUSINESS_PROFILE);
  } catch (error) {
    if (error instanceof OwnerPermissionDeniedError) return { staff: null, error: error.message } as const;
    throw error;
  }

  const staff = await prisma.staffProfile.findUnique({ where: { userId: session.user.id } });
  if (!staff) return { staff: null, error: "You must be signed in as staff." } as const;

  return { staff, error: null } as const;
}

export async function updateBusinessProfileAction(params: {
  profile: BusinessProfileInput;
  location: BusinessLocationInput;
}): Promise<BusinessActionResult> {
  const { staff, error } = await requireBusinessManager();
  if (!staff) return { success: false, error: error ?? "Not authorized." };

  const result = await updateBusinessProfile(prisma, { businessId: staff.businessId, ...params });
  if (!result.success) {
    return { success: false, error: result.validation.issues[0]?.message ?? "Couldn't save business details." };
  }

  await writeAuditLog(prisma, {
    actorUserId: staff.userId,
    action: "BUSINESS_PROFILE_UPDATED",
    entityType: "Business",
    entityId: staff.businessId,
    metadata: { name: params.profile.name },
  });

  return { success: true };
}

export async function updateBusinessSettingsAction(settings: BusinessSettingsInput): Promise<BusinessActionResult> {
  const { staff, error } = await requireBusinessManager();
  if (!staff) return { success: false, error: error ?? "Not authorized." };

  await updateBusinessSettings(prisma, { businessId: staff.businessId, settings });

  await writeAuditLog(prisma, {
    actorUserId: staff.userId,
    action: "BUSINESS_SETTINGS_UPDATED",
    entityType: "BusinessSettings",
    entityId: staff.businessId,
  });

  return { success: true };
}

export interface OpeningHoursActionResult {
  success: boolean;
  error?: string;
  conflicts?: { id: string; customerName: string; serviceNames: string; startAt: string; staffName: string }[];
}

export async function updateOpeningHoursAction(
  days: OpeningHoursDayInput[],
  acknowledgeConflicts?: boolean,
): Promise<OpeningHoursActionResult> {
  const { staff, error } = await requireBusinessManager();
  if (!staff) return { success: false, error: error ?? "Not authorized." };

  const business = await prisma.business.findUnique({ where: { id: staff.businessId }, select: { timezone: true } });
  if (!business) return { success: false, error: "Business not found." };

  const result = await setOpeningHours(prisma, {
    businessId: staff.businessId,
    businessTimezone: business.timezone,
    days,
    acknowledgeConflicts,
  });

  if (!result.success) {
    return {
      success: false,
      error: result.validation.issues[0]?.message ?? "Couldn't save opening hours.",
      conflicts: result.conflicts.map((c) => ({
        id: c.id,
        customerName: `${c.customer.firstName} ${c.customer.lastName}`,
        serviceNames: c.services.map((s) => s.service.name).join(" + "),
        startAt: c.startAt.toISOString(),
        staffName: c.staff.user.name ?? "Staff",
      })),
    };
  }

  await writeAuditLog(prisma, {
    actorUserId: staff.userId,
    action: "BUSINESS_HOURS_UPDATED",
    entityType: "BusinessHours",
    entityId: staff.businessId,
  });

  return { success: true };
}