import { Router } from "express";
import { storage } from "../storage";
import { requireFormAdminOrPermission, type AuthenticatedRequest } from "../middleware/auth.middleware";
import { formsCache } from "../utils/cache";
import { indexFormWithSummaryAsync } from "./task-helpers";
import { isValidFieldType } from "@shared/field-types";

export function registerFormStructureRoutes(router: ReturnType<typeof import("express").Router>): void {
  // === FORM TABS ENDPOINTS ===

  router.get('/api/forms/:id/tabs', 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 hasManageForms = await storage.hasAppRolePermission(req.user!.appRole, ['forms.manage']);
      if (!hasManageForms) {
        const canAccess = await storage.canUserAccessForm(req.user!.id, formId, req.organizationId!, 'participate');
        if (!canAccess) {
          return res.status(403).json({ success: false, error: 'Нет доступа к этой форме' });
        }
      }
      const tabs = await storage.getFormTabsByCreationOrder(formId, req.organizationId!);
      res.json({ success: true, tabs });
    } catch (error) {
      console.error('Get form tabs error:', error);
      res.status(500).json({ success: false, error: 'Ошибка при получении вкладок формы' });
    }
  });

  router.post('/api/forms/:id/tabs',
    requireFormAdminOrPermission('forms.manage'),
    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 { tabs } = req.body;
        if (!Array.isArray(tabs)) {
          return res.status(400).json({ success: false, error: 'Вкладки должны быть массивом' });
        }
        const savedTabs = await storage.bulkSaveFormTabs(formId, req.organizationId!, tabs);
        formsCache.invalidatePrefix(`forms:${req.organizationId}`);
        res.json({ success: true, tabs: savedTabs, message: 'Вкладки сохранены' });
      } catch (error) {
        console.error('Save form tabs error:', error);
        res.status(500).json({ success: false, error: 'Ошибка при сохранении вкладок' });
      }
    }
  );

  // === FORM FIELDS ENDPOINTS ===

  /**
   * @swagger
   * /api/forms/{id}/fields:
   *   get:
   *     tags: [Forms]
   *     summary: Поля формы
   *   post:
   *     tags: [Forms]
   *     summary: Добавить поле в форму
   */
  router.get('/api/forms/:id/fields', 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 hasManageForms = await storage.hasAppRolePermission(req.user!.appRole, ['forms.manage']);
      if (!hasManageForms) {
        const canAccess = await storage.canUserAccessForm(req.user!.id, formId, req.organizationId!, 'participate');
        if (!canAccess) {
          return res.status(403).json({ success: false, error: 'Нет доступа к этой форме' });
        }
      }
      const fields = await storage.getFormFieldsByCreationOrder(formId, req.organizationId!);
      res.json({ success: true, fields });
    } catch (error) {
      console.error('Get form fields error:', error);
      res.status(500).json({ success: false, error: 'Ошибка при получении полей формы' });
    }
  });

  router.post('/api/forms/:id/fields',
    requireFormAdminOrPermission('forms.manage'),
    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 { fields } = req.body;
        if (!Array.isArray(fields)) {
          return res.status(400).json({ success: false, error: 'Поля должны быть массивом' });
        }

        const existingFields = await storage.getFormFields(formId, req.organizationId!);
        const incomingIds = fields.filter((f: Record<string, unknown>) => f.id).map((f: Record<string, unknown>) => f.id as number);
        const fieldsToDelete = existingFields.filter(existing => !incomingIds.includes(existing.id));

        if (fieldsToDelete.length > 0) {
          const tasks = await storage.getTasksByForm(formId, req.organizationId!);
          const usedFieldIds = new Set();
          for (const task of tasks) {
            const fieldValues = await storage.getTaskFieldValues(task.id, req.organizationId!);
            for (const value of fieldValues) {
              usedFieldIds.add(value.fieldId);
            }
          }
          for (const field of fieldsToDelete) {
            if (usedFieldIds.has(field.id)) {
              return res.status(400).json({
                success: false,
                error: `Невозможно удалить поле "${field.name}" - оно используется в существующих задачах. Сначала удалите значения этого поля во всех задачах.`
              });
            }
          }
        }

        const fieldIdsToDelete = fieldsToDelete.map(f => f.id);
        const normalizedFields = fields.map((f: Record<string, unknown>) => ({
          ...f,
          maxFileCount: f.maxFileCount != null && parseInt(String(f.maxFileCount)) > 0 ? parseInt(String(f.maxFileCount)) : null,
          maxFileSizeMB: f.maxFileSizeMB != null && parseInt(String(f.maxFileSizeMB)) > 0 ? parseInt(String(f.maxFileSizeMB)) : null,
        }));

        // Validate field types for new fields
        for (const field of fields as Array<Record<string, unknown>>) {
          const fieldId = field.id as number | undefined;
          const isNew = !fieldId || (typeof fieldId === 'number' && fieldId < 0);
          const fieldType = field.type as string;
          if (isNew && fieldType && !isValidFieldType(fieldType, 'form')) {
            return res.status(400).json({
              success: false,
              error: `Тип поля "${fieldType}" нельзя создать напрямую в форме. Используйте глобальные поля.`,
            });
          }
        }

        const resultFields = await storage.bulkSaveFormFields(formId, req.organizationId!, fieldIdsToDelete, normalizedFields as Parameters<typeof storage.bulkSaveFormFields>[3]);
        formsCache.invalidatePrefix(`forms:${req.organizationId}`);
        indexFormWithSummaryAsync(formId, req.organizationId!).catch(() => {});

        res.status(201).json({ success: true, message: 'Поля сохранены', fields: resultFields });
      } catch (error) {
        console.error('Save form fields error:', error);
        res.status(500).json({ success: false, error: 'Ошибка при сохранении полей' });
      }
    }
  );
}