import { storage } from "../storage";
import { authenticateToken, type AuthenticatedRequest } from "../middleware/auth.middleware";
import { tenantIsolation } from "../middleware/tenant.middleware";
import { db } from "../db";
import { dataTables } from "@shared/schema";
import { eq, and } from "drizzle-orm";

export function registerDataTableSyncRoutes(app: import("express").Express): void {
  // =====================================================
  // DATA TABLE SYNC API (для импорта/синхронизации)
  // =====================================================

  // Sync table (полная синхронизация как в Pyrus)
  app.post(['/api/tables/:tableId/sync', '/api/directories/:tableId/sync'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        
        if (!table) {
          return res.status(404).json({ error: 'Таблица не найдена' });
        }

        const role = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (!role || role === 'reader') {
          return res.status(403).json({ error: 'Нет прав для синхронизации' });
        }

        const { apply, rows } = req.body;
        if (!rows || !Array.isArray(rows)) {
          return res.status(400).json({ error: 'Строки обязательны' });
        }

        const currentRows = await storage.getDataTableRows(tableId, req.organizationId!);
        const validCurrentRows = currentRows.filter(r => Array.isArray(r.values));
        const currentRowsById = new Map(validCurrentRows.map(r => [r.id, r]));

        const normalizeValues = (values: (string | null)[] | null, columnCount: number): string[] => {
          const arr = values || [];
          const result: string[] = [];
          for (let i = 0; i < columnCount; i++) {
            const val = arr[i];
            result.push(val === null || val === undefined ? '' : String(val).trim());
          }
          return result;
        };

        const columnCount = table.columns?.length || 6;
        const makeValuesKey = (values: (string | null)[] | null) => JSON.stringify(normalizeValues(values, columnCount));

        // Detect extended format: rows contain id or parentId
        const isExtendedFormat = rows.some((r: any) => r && (r.id != null || r.parentId != null));

        if (isExtendedFormat) {
          // Parse incoming rows
          const incomingRows: {
            rawId?: number | null;
            values: string[];
            parentId?: number | null;
            position: number;
          }[] = rows.map((r: any, index: number) => ({
            rawId: r.id != null ? Number(r.id) : undefined,
            values: normalizeValues(r.values, columnCount),
            parentId: r.parentId != null ? Number(r.parentId) : null,
            position: index,
          }));

          // Resolve existing row id for each incoming row
          const incomingWithResolvedId = incomingRows.map((row) => {
            const existing = row.rawId != null ? currentRowsById.get(row.rawId) : undefined;
            return {
              ...row,
              existingId: existing ? existing.id : undefined,
            };
          });

          // Determine deleted rows: existing ids not present in incoming rows
          const incomingExistingIds = new Set(
            incomingWithResolvedId
              .filter(r => r.existingId != null)
              .map(r => r.existingId!)
          );
          const deleted = validCurrentRows
            .filter(r => !incomingExistingIds.has(r.id))
            .map(r => ({ id: r.id, values: normalizeValues(r.values, columnCount) }));
          const deletedIds = new Set(deleted.map(d => d.id));

          // Validate parent references
          const validParentIds = new Set(validCurrentRows.map(r => r.id).filter(id => !deletedIds.has(id)));
          for (const row of incomingWithResolvedId) {
            if (row.parentId != null) {
              if (!validParentIds.has(row.parentId)) {
                return res.status(400).json({ error: `Некорректный parentId ${row.parentId}: строка не найдена или будет удалена` });
              }
              if (row.existingId != null && row.parentId === row.existingId) {
                return res.status(400).json({ error: `Строка не может быть родителем самой себя (id ${row.existingId})` });
              }
            }
          }

          // Detect cycles using union-find / ancestor check
          const parentMap = new Map<number | string, number | null>();
          for (const row of incomingWithResolvedId) {
            const key = row.existingId != null ? row.existingId : `new:${row.position}`;
            parentMap.set(key, row.parentId ?? null);
          }

          const getAncestors = (start: number | string): Set<number | string> => {
            const ancestors = new Set<number | string>();
            let current: number | string | null | undefined = start;
            while (current != null) {
              if (ancestors.has(current)) break; // cycle detected
              ancestors.add(current);
              current = parentMap.get(current);
            }
            return ancestors;
          };

          for (const row of incomingWithResolvedId) {
            if (row.parentId == null) continue;
            const key = row.existingId != null ? row.existingId : `new:${row.position}`;
            const ancestors = getAncestors(row.parentId);
            if (ancestors.has(key)) {
              return res.status(400).json({ error: `Обнаружен цикл в иерархии для строки ${row.values[0] || row.position}` });
            }
          }

          // Build preview lists
          const added: { values: string[]; position: number; parentId: number | null }[] = [];
          const updated: { id: number; values: string[]; oldPosition: number; newPosition: number; parentId: number | null; oldParentId: number | null }[] = [];

          for (const row of incomingWithResolvedId) {
            if (row.existingId == null) {
              added.push({ values: row.values, position: row.position, parentId: row.parentId ?? null });
            } else {
              const existing = currentRowsById.get(row.existingId)!;
              const parentChanged = (row.parentId ?? null) !== (existing.parentId ?? null);
              const positionChanged = row.position !== existing.position;
              const valuesChanged = makeValuesKey(row.values) !== makeValuesKey(existing.values);
              if (parentChanged || positionChanged || valuesChanged) {
                updated.push({
                  id: existing.id,
                  values: row.values,
                  oldPosition: existing.position,
                  newPosition: row.position,
                  parentId: row.parentId ?? null,
                  oldParentId: existing.parentId ?? null,
                });
              }
            }
          }

          if (apply) {
            const positionUpdates = updated
              .filter(u => u.oldPosition === u.newPosition && u.oldParentId === u.parentId && makeValuesKey(u.values) === makeValuesKey(currentRowsById.get(u.id)!.values))
              .map(u => ({ id: u.id, position: u.newPosition, parentId: u.parentId }));
            const reordered = updated
              .filter(u => u.oldPosition !== u.newPosition || u.oldParentId !== u.parentId || makeValuesKey(u.values) !== makeValuesKey(currentRowsById.get(u.id)!.values))
              .map(u => ({ id: u.id, newPosition: u.newPosition, parentId: u.parentId }));

            await storage.applyDataTableSync(
              tableId,
              deleted,
              added,
              reordered,
              positionUpdates
            );
          }

          return res.json({
            apply,
            added: added.length,
            updated: updated.length,
            deleted: deleted.length,
            addedRows: added.map(r => ({ values: r.values, parentId: r.parentId })),
            updatedRows: updated.map(r => ({ id: r.id, values: r.values, oldPosition: r.oldPosition, newPosition: r.newPosition, parentId: r.parentId, oldParentId: r.oldParentId })),
            deletedRows: deleted.map(r => ({ id: r.id, values: r.values })),
          });
        }

        // Legacy format: sync by full values key
        const currentRowsByKey = new Map(validCurrentRows.map(r => [makeValuesKey(r.values), r]));
        const currentKeysSet = new Set(validCurrentRows.map(r => makeValuesKey(r.values)));
        const newKeysSet = new Set(rows.map((r: { values: string[] }) => makeValuesKey(r.values)));

        const added: { values: string[], position: number; parentId?: number | null }[] = [];
        const deleted: { id: number; values: string[] }[] = [];
        const reordered: { id: number; values: string[]; oldPosition: number; newPosition: number; parentId?: number | null }[] = [];

        rows.forEach((newRow: { values: string[] }, index: number) => {
          const key = makeValuesKey(newRow.values);
          if (!currentKeysSet.has(key)) {
            added.push({ values: newRow.values, position: index });
          } else {
            const existingRow = currentRowsByKey.get(key);
            if (existingRow && existingRow.position !== index) {
              reordered.push({
                id: existingRow.id,
                values: normalizeValues(existingRow.values, columnCount),
                oldPosition: existingRow.position,
                newPosition: index,
              });
            }
          }
        });

        for (const currentRow of validCurrentRows) {
          const key = makeValuesKey(currentRow.values);
          if (!newKeysSet.has(key)) {
            deleted.push({ id: currentRow.id, values: normalizeValues(currentRow.values, columnCount) });
          }
        }

        if (apply) {
          const positionUpdates: { id: number; position: number }[] = [];
          for (let i = 0; i < rows.length; i++) {
            const key = makeValuesKey(rows[i].values);
            const existingRow = currentRowsByKey.get(key);
            if (existingRow && !deleted.some(d => d.id === existingRow.id)) {
              positionUpdates.push({ id: existingRow.id, position: i });
            }
          }
          await storage.applyDataTableSync(
            tableId,
            deleted,
            added,
            reordered.map(r => ({ id: r.id, newPosition: r.newPosition })),
            positionUpdates
          );
        }

        res.json({
          apply,
          added: added.length,
          deleted: deleted.length,
          reordered: reordered.length,
          addedRows: added.map(r => ({ values: r.values })),
          deletedRows: deleted.map(r => ({ id: r.id, values: r.values })),
          reorderedRows: reordered.map(r => ({ values: r.values, oldPosition: r.oldPosition, newPosition: r.newPosition }))
        });
      } catch (error) {
        console.error('Sync table error:', error);
        res.status(500).json({ error: 'Ошибка синхронизации таблицы' });
      }
    }
  );

  // Diff table (частичное обновление как в Pyrus)
  app.post(['/api/tables/:tableId/diff', '/api/directories/:tableId/diff'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        
        if (!table) {
          return res.status(404).json({ error: 'Таблица не найдена' });
        }

        const role = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (!role || role === 'reader') {
          return res.status(403).json({ error: 'Нет прав для изменения' });
        }

        const { upsert, delete: deleteKeys } = req.body;

        const currentRows = await storage.getDataTableRows(tableId, req.organizationId!);

        const upsertArr = upsert && Array.isArray(upsert) ? upsert : [];
        const deleteKeysArr = deleteKeys && Array.isArray(deleteKeys) ? deleteKeys : [];

        const result = await storage.applyDataTableDiff(tableId, upsertArr, deleteKeysArr, currentRows);

        res.json({
          apply: true,
          added: result.added.map(r => ({ id: r.id, values: r.values })),
          updated: result.updated.map(r => ({ id: r.id, values: r.values })),
          deleted: result.deleted.map(r => ({ id: r.id, values: r.values }))
        });
      } catch (error) {
        console.error('Diff table error:', error);
        res.status(500).json({ error: 'Ошибка изменения таблицы' });
      }
    }
  );

  // =====================================================
  // DATA TABLE PERMISSIONS API
  // =====================================================

  // Get table permissions
  app.get(['/api/tables/:tableId/permissions', '/api/directories/:tableId/permissions'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        
        if (!table) {
          return res.status(404).json({ error: 'Таблица не найдена' });
        }

        const role = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (role !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для просмотра прав доступа' });
        }

        const permissions = await storage.getDataTablePermissions(tableId, req.organizationId!);
        res.json({ permissions, createdBy: table.createdBy });
      } catch (error) {
        console.error('Get table permissions error:', error);
        res.status(500).json({ error: 'Ошибка получения прав доступа' });
      }
    }
  );

  // Set table permission
  app.post(['/api/tables/:tableId/permissions', '/api/directories/:tableId/permissions'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        
        if (!table) {
          return res.status(404).json({ error: 'Таблица не найдена' });
        }

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для управления правами доступа' });
        }

        const { userId, role } = req.body;
        if (!userId || !role) {
          return res.status(400).json({ error: 'ID пользователя и роль обязательны' });
        }

        if (!['admin', 'editor', 'reader'].includes(role)) {
          return res.status(400).json({ error: 'Недопустимая роль' });
        }

        if (userId === table.createdBy) {
          return res.status(400).json({ error: 'Нельзя изменить права создателя таблицы' });
        }

        const permission = await storage.setDataTablePermission({ tableId, userId, role });
        res.json({ permission });
      } catch (error) {
        console.error('Set table permission error:', error);
        res.status(500).json({ error: 'Ошибка установки прав доступа' });
      }
    }
  );

  // Delete table permission
  app.delete(['/api/tables/:tableId/permissions/:userId', '/api/directories/:tableId/permissions/:userId'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const targetUserId = parseInt(req.params.userId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        
        if (!table) {
          return res.status(404).json({ error: 'Таблица не найдена' });
        }

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для управления правами доступа' });
        }

        await storage.deleteDataTablePermission(tableId, targetUserId);
        res.json({ success: true });
      } catch (error) {
        console.error('Delete table permission error:', error);
        res.status(500).json({ error: 'Ошибка удаления прав доступа' });
      }
    }
  );

  // =====================================================
  // DATA TABLE ACCESS RULES API (role-based)
  // =====================================================

  app.get(['/api/tables/:tableId/access-rules', '/api/directories/:tableId/access-rules'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        if (!table) return res.status(404).json({ error: 'Таблица не найдена' });

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для просмотра прав доступа' });
        }

        const rules = await storage.getDataTableAccessRules(tableId, req.organizationId!);
        const linkedForms = await storage.getLinkedFormsForTable(tableId, req.organizationId!);
        res.json({ rules, linkedForms });
      } catch (error) {
        console.error('Get table access rules error:', error);
        res.status(500).json({ error: 'Ошибка получения прав доступа' });
      }
    }
  );

  app.post(['/api/tables/:tableId/access-rules', '/api/directories/:tableId/access-rules'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        if (!table) return res.status(404).json({ error: 'Таблица не найдена' });

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для управления правами доступа' });
        }

        const { targetType, targetId, accessLevel } = req.body;
        if (!targetType || !targetId || !accessLevel) {
          return res.status(400).json({ error: 'targetType, targetId и accessLevel обязательны' });
        }
        if (!['user', 'role'].includes(targetType) || !['reader', 'editor', 'admin'].includes(accessLevel)) {
          return res.status(400).json({ error: 'Недопустимые значения targetType или accessLevel' });
        }

        const rule = await storage.createDataTableAccessRule({
          tableId,
          organizationId: req.organizationId!,
          targetType,
          targetId,
          accessLevel,
        });
        res.json({ rule });
      } catch (error) {
        console.error('Create table access rule error:', error);
        res.status(500).json({ error: 'Ошибка создания правила доступа' });
      }
    }
  );

  app.delete(['/api/tables/:tableId/access-rules/:ruleId', '/api/directories/:tableId/access-rules/:ruleId'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const ruleId = parseInt(req.params.ruleId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        if (!table) return res.status(404).json({ error: 'Таблица не найдена' });

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для управления правами доступа' });
        }

        await storage.deleteDataTableAccessRule(ruleId, req.organizationId!);
        res.json({ success: true });
      } catch (error) {
        console.error('Delete table access rule error:', error);
        res.status(500).json({ error: 'Ошибка удаления правила доступа' });
      }
    }
  );

  app.patch(['/api/tables/:tableId/visibility', '/api/directories/:tableId/visibility'],
    authenticateToken,
    tenantIsolation,
    async (req: AuthenticatedRequest, res) => {
      try {
        const tableId = parseInt(req.params.tableId);
        const table = await storage.getDataTable(tableId, req.organizationId!);
        if (!table) return res.status(404).json({ error: 'Таблица не найдена' });

        const currentRole = await storage.getUserTableRole(tableId, req.user!.id, table.createdBy, req.organizationId!);
        if (currentRole !== 'admin') {
          return res.status(403).json({ error: 'Нет прав для изменения настроек' });
        }

        const { visibility } = req.body;
        if (!['restricted', 'organization'].includes(visibility)) {
          return res.status(400).json({ error: 'Недопустимое значение visibility' });
        }

        const [updated] = await db.update(dataTables)
          .set({ visibility })
          .where(and(eq(dataTables.id, tableId), eq(dataTables.organizationId, req.organizationId!)))
          .returning();
        res.json({ table: updated });
      } catch (error) {
        console.error('Update table visibility error:', error);
        res.status(500).json({ error: 'Ошибка изменения видимости' });
      }
    }
  );
}