import { Router } from "express";
import { storage } from "../storage";
import { requireFormAdminOrPermission, type AuthenticatedRequest } from "../middleware/auth.middleware";
import { validateRequest } from "../middleware/validation.middleware";
import { updateFormSchema } from "@shared/schema";
import { formsCache } from "../utils/cache";
import { formatUserName } from "../utils/formatUserName";
import { indexFormAsync } from "./task-helpers";
import { recalculateTaskTitles } from "./shared";

export function registerFormUpdateRoutes(router: ReturnType<typeof import("express").Router>): void {
  /**
   * @swagger
   * /api/forms/{id}:
   *   put:
   *     tags: [Forms]
   *     summary: Обновить форму (admin)
   */
  router.put('/api/forms/:id',
    requireFormAdminOrPermission('forms.manage'),
    validateRequest(updateFormSchema),
    async (req: AuthenticatedRequest, res) => {
      try {
        const formId = parseInt(req.params.id);
        if (isNaN(formId)) {
          return res.status(400).json({ success: false, error: 'Неверный ID формы' });
        }

        const existingForm = await storage.getForm(formId, req.organizationId!);
        if (!existingForm) {
          return res.status(404).json({ success: false, error: 'Форма не найдена' });
        }

        const updateData = { ...req.body };

        const incomingSummary: string | undefined = updateData.aiSummary;
        const existingSummary: string = existingForm.aiSummary ?? '';

        if (incomingSummary === '' && existingSummary) {
          delete updateData.aiSummary;
        } else if (!incomingSummary && !existingSummary) {
          const [fields, statuses, transitions, orgUsers, orgRolesDesc] = await Promise.all([
            storage.getFormFields(formId, req.organizationId!),
            storage.getFormStatuses(formId, req.organizationId!),
            storage.getStatusTransitions(formId, req.organizationId!),
            storage.getUsersByOrganization(req.organizationId!),
            storage.getRoles(req.organizationId!),
          ]);
          const formName = updateData.name ?? existingForm.name ?? '';
          const tmpl = (updateData.titleTemplate ?? existingForm.titleTemplate ?? '').trim();
          const fieldNames = fields.filter(f => f.name).map(f => f.name).join(', ');
          const statusMap = new Map(statuses.map(s => [s.id, s.name]));
          const statusNames = statuses.map(s => s.name).join(', ');
          const fieldMap = new Map(fields.map(f => [f.code, f.name]));
          const userMap = new Map(orgUsers.map(u => [u.id, formatUserName(u) || u.email]));
          const roleMap = new Map(orgRolesDesc.map(r => [r.id, r.name]));

          const describeTransition = (t: typeof transitions[number]): string => {
            const from = statusMap.get(t.fromStatusId);
            const to = statusMap.get(t.toStatusId);
            if (!from || !to) return '';
            const details: string[] = [];
            if (t.actionName) details.push(`кнопка «${t.actionName}»`);
            if (t.requiredRole === 'admin') details.push('только администраторы');
            if (t.assigneeUserId) {
              const uname = userMap.get(t.assigneeUserId) || `пользователь #${t.assigneeUserId}`;
              details.push(`согласует ${uname}`);
            }
            const ac = t.assigneeConditions as Record<string, unknown>;
            if (ac) {
              const acRules = (ac.rules as Record<string, unknown>[] | undefined) || (ac.field && ac.assigneeId ? [{ fieldCode: ac.field, value: ac.value, assigneeUserId: ac.assigneeId }] : []);
              acRules.forEach((r: Record<string, unknown>) => {
                const fname = fieldMap.get(String(r.fieldCode)) || r.fieldCode;
                if (r.assigneeSource === 'role' && r.roleId) {
                  const rname = roleMap.get(Number(r.roleId)) || `роль #${r.roleId}`;
                  if (fname) details.push(`если поле «${fname}»="${r.value || '...'}" → согласует роль «${rname}»`);
                } else {
                  const uname = r.assigneeUserId ? (userMap.get(Number(r.assigneeUserId)) || `пользователь #${r.assigneeUserId}`) : '';
                  if (fname && uname) details.push(`если поле «${fname}»="${r.value || '...'}" → согласует ${uname}`);
                }
              });
              if (ac.fallbackAssigneeUserId) {
                const u = userMap.get(Number(ac.fallbackAssigneeUserId)) || `пользователь #${ac.fallbackAssigneeUserId}`;
                details.push(`по умолчанию согласует ${u}`);
              }
            }
            const cond = t.conditions as Record<string, unknown>;
            if (cond) {
              (cond.routingRules as Array<Record<string,unknown>> || []).forEach((r) => {
                const fname = fieldMap.get(r.fieldCode as unknown as string) || r.fieldCode;
                const sname = statusMap.get(Number(r.toStatusId)) || `статус #${r.toStatusId}`;
                if (fname) details.push(`если «${fname}»="${r.value}" → ${sname}`);
              });
              if (cond.defaultToStatusId) {
                const sname = statusMap.get(Number(cond.defaultToStatusId));
                if (sname) details.push(`по умолчанию → ${sname}`);
              }
              (cond.rejectRoutingRules as Array<Record<string,unknown>> || []).forEach((r) => {
                const fname = fieldMap.get(r.fieldCode as unknown as string) || r.fieldCode;
                const sname = statusMap.get(Number(r.toStatusId)) || `статус #${r.toStatusId}`;
                if (fname) details.push(`при отклонении если «${fname}»="${r.value}" → ${sname}`);
              });
            }
            if (t.rejectToStatusId) {
              const sname = statusMap.get(t.rejectToStatusId);
              if (sname) details.push(`при отклонении → ${sname}`);
            }
            const base = `${from} → ${to}`;
            return details.length ? `${base} (${details.join(', ')})` : base;
          };

          const transitionLines = transitions.map(describeTransition).filter(Boolean).join('; ');
          const parts: string[] = [];
          if (formName) parts.push(`Форма: ${formName}`);
          if (tmpl) parts.push(`Шаблон названия: ${tmpl}`);
          if (fieldNames) parts.push(`Поля: ${fieldNames}`);
          if (statusNames) parts.push(`Статусы: ${statusNames}`);
          if (transitionLines) parts.push(`Переходы: ${transitionLines}`);
          if (parts.length) updateData.aiSummary = parts.join('. ') + '.';
        }

        const updatedForm = await storage.updateForm(formId, req.organizationId!, updateData);
        formsCache.invalidatePrefix(`forms:${req.organizationId}`);
        indexFormAsync(formId, req.organizationId!).catch(() => {});

        // If titleTemplate changed, recalculate all task titles for this form
        const oldTemplate = existingForm.titleTemplate ?? '';
        const newTemplate = updateData.titleTemplate ?? '';
        let recalculation = null;
        if (oldTemplate !== newTemplate && newTemplate) {
          recalculation = await recalculateTaskTitles(formId, req.organizationId!);
        }

        let message = 'Форма обновлена';
        if (recalculation) {
          if (recalculation.errors.length > 0) {
            message += ` (названия обновлены: ${recalculation.updated} из ${recalculation.total}, ошибок: ${recalculation.errors.length})`;
          } else if (recalculation.updated > 0) {
            message += ` (названия обновлены: ${recalculation.updated} из ${recalculation.total})`;
          }
        }

        res.json({ success: true, message, form: updatedForm, recalculation });
      } catch (error) {
        console.error('Update form error:', error);
        res.status(500).json({ success: false, error: 'Ошибка при обновлении формы' });
      }
    }
  );
}