import { forms, formFields, formStatuses, tasks, taskFieldValues, dataTables, externalServices, regularTableRows, type ExternalService, type InsertExternalService, type RegularTableRow, type InsertRegularTableRow } from "@shared/schema";
import { taskRelations } from "@shared/schema";
import { db } from "../db";
import { eq, and, or, asc, isNotNull, inArray } from "drizzle-orm";
import type { RelatedTreeNode } from "../storage";
import { DataTablesCoreStorage } from "./data-tables-core.storage";
export class DataTablesStorage extends DataTablesCoreStorage {
  // Related Tasks (for task-type fields)
  async getRelatedTasks(taskId: number, organizationId: number): Promise<{
    parents: RelatedTreeNode[];
    children: RelatedTreeNode[];
  }> {
    const getTaskInfo = async (id: number) => {
      const [row] = await db
        .select({
          id: tasks.id,
          title: tasks.title,
          formId: tasks.formId,
          formName: forms.name,
          isFinal: formStatuses.isFinal,
          statusName: formStatuses.name,
          statusColor: formStatuses.color,
        })
        .from(tasks)
        .innerJoin(forms, eq(tasks.formId, forms.id))
        .leftJoin(formStatuses, eq(tasks.currentStatusId, formStatuses.id))
        .where(and(eq(tasks.id, id), eq(forms.organizationId, organizationId)));
      return row;
    };

    const buildParentTree = async (nodeId: number, pathVisited: Set<number>, depth: number): Promise<RelatedTreeNode[]> => {
      if (depth >= 10) return [];
      const rels = await db
        .select({ parentTaskId: taskRelations.parentTaskId, fieldName: formFields.name })
        .from(taskRelations)
        .leftJoin(formFields, eq(taskRelations.fieldId, formFields.id))
        .where(and(eq(taskRelations.childTaskId, nodeId), eq(taskRelations.organizationId, organizationId)));

      const result: RelatedTreeNode[] = [];
      for (const rel of rels) {
        if (pathVisited.has(rel.parentTaskId)) continue;
        const info = await getTaskInfo(rel.parentTaskId);
        if (!info) continue;
        const branchVisited = new Set(pathVisited);
        branchVisited.add(rel.parentTaskId);
        const nodes = await buildParentTree(rel.parentTaskId, branchVisited, depth + 1);
        result.push({ ...info, isFinal: info.isFinal ?? false, fieldName: rel.fieldName ?? 'Связь из чата', nodes });
      }
      return result;
    };

    const buildChildTree = async (nodeId: number, pathVisited: Set<number>, depth: number): Promise<RelatedTreeNode[]> => {
      if (depth >= 10) return [];
      const rels = await db
        .select({ childTaskId: taskRelations.childTaskId, fieldName: formFields.name })
        .from(taskRelations)
        .leftJoin(formFields, eq(taskRelations.fieldId, formFields.id))
        .where(and(eq(taskRelations.parentTaskId, nodeId), eq(taskRelations.organizationId, organizationId)));

      const result: RelatedTreeNode[] = [];
      for (const rel of rels) {
        if (pathVisited.has(rel.childTaskId)) continue;
        const info = await getTaskInfo(rel.childTaskId);
        if (!info) continue;
        const branchVisited = new Set(pathVisited);
        branchVisited.add(rel.childTaskId);
        const nodes = await buildChildTree(rel.childTaskId, branchVisited, depth + 1);
        result.push({ ...info, isFinal: info.isFinal ?? false, fieldName: rel.fieldName ?? 'Связь из чата', nodes });
      }
      return result;
    };

    const rootVisited = new Set<number>([taskId]);
    const [relParents, relChildren] = await Promise.all([
      buildParentTree(taskId, new Set(rootVisited), 0),
      buildChildTree(taskId, new Set(rootVisited), 0),
    ]);

    const [taskRow] = await db
      .select({ parentTaskId: tasks.parentTaskId })
      .from(tasks)
      .innerJoin(forms, eq(tasks.formId, forms.id))
      .where(and(eq(tasks.id, taskId), eq(forms.organizationId, organizationId)));

    let parents = relParents;
    if (taskRow?.parentTaskId) {
      const alreadyIncluded = relParents.some(p => p.id === taskRow.parentTaskId);
      if (!alreadyIncluded) {
        const info = await getTaskInfo(taskRow.parentTaskId);
        if (info) {
          const hierarchyNodes = await buildParentTree(taskRow.parentTaskId, new Set([taskId, taskRow.parentTaskId]), 0);
          parents = [
            { ...info, isFinal: info.isFinal ?? false, fieldName: 'Иерархия', nodes: hierarchyNodes },
            ...relParents,
          ];
        }
      }
    }

    const subtaskRows = await db
      .select({ id: tasks.id })
      .from(tasks)
      .innerJoin(forms, eq(tasks.formId, forms.id))
      .where(and(eq(tasks.parentTaskId, taskId), eq(forms.organizationId, organizationId)));

    let children = relChildren;

    // --- GROUP relChildren by their parentTaskId (intermediate nodes) ---
    if (relChildren.length > 0) {
      const relChildIds = relChildren.map(c => c.id);
      const relChildParentTaskIds = relChildIds.length > 0
        ? await db.select({ id: tasks.id, parentTaskId: tasks.parentTaskId })
            .from(tasks)
            .where(and(inArray(tasks.id, relChildIds), eq(forms.organizationId, organizationId)))
            .innerJoin(forms, eq(tasks.formId, forms.id))
        : [];

      const grouped = new Map<number, RelatedTreeNode[]>();
      const ungrouped: RelatedTreeNode[] = [];

      console.log('[DEBUG] relChildIds:', relChildIds, 'relChildParentTaskIds:', JSON.stringify(relChildParentTaskIds));

      for (const child of relChildren) {
        const ppt = relChildParentTaskIds.find(p => p.id === child.id)?.parentTaskId;
        console.log('[DEBUG] child.id:', child.id, 'ppt:', ppt, 'taskId:', taskId);
        if (ppt && ppt !== taskId) {
          if (!grouped.has(ppt)) grouped.set(ppt, []);
          grouped.get(ppt)!.push(child);
        } else {
          ungrouped.push(child);
        }
      }

      const newRelChildren: RelatedTreeNode[] = [...ungrouped];
      for (const [intermediateId, childNodes] of grouped) {
        const intInfo = await getTaskInfo(intermediateId);
        if (intInfo) {
          newRelChildren.push({
            ...intInfo,
            isFinal: intInfo.isFinal ?? false,
            fieldName: 'Иерархия',
            nodes: childNodes,
          });
        }
      }
      children = newRelChildren;
    }

    // --- extraChildren via parentTaskId, grouped by their task_relations parent ---
    const relChildIdsSet = new Set(children.map(c => c.id));
    const hierarchySubtasks = subtaskRows.filter(s => !relChildIdsSet.has(s.id));

    if (hierarchySubtasks.length > 0) {
      const hcIds = hierarchySubtasks.map(h => h.id);
      const hcRelationParents = hcIds.length > 0
        ? await db.select({ childTaskId: taskRelations.childTaskId, parentTaskId: taskRelations.parentTaskId, fieldName: formFields.name })
            .from(taskRelations)
            .leftJoin(formFields, eq(taskRelations.fieldId, formFields.id))
            .where(and(inArray(taskRelations.childTaskId, hcIds), eq(taskRelations.organizationId, organizationId)))
        : [];

      const extraChildren: RelatedTreeNode[] = [];
      const grouped = new Map<number, RelatedTreeNode[]>();
      const ungrouped: RelatedTreeNode[] = [];

      for (const sub of hierarchySubtasks) {
        const info = await getTaskInfo(sub.id);
        if (!info) continue;
        const subNodes = await buildChildTree(sub.id, new Set([taskId, sub.id]), 0);
        const node: RelatedTreeNode = { ...info, isFinal: info.isFinal ?? false, fieldName: 'Иерархия', nodes: subNodes };

        const rel = hcRelationParents.find(r => r.childTaskId === sub.id);
        if (rel && rel.parentTaskId !== taskId) {
          if (!grouped.has(rel.parentTaskId)) grouped.set(rel.parentTaskId, []);
          grouped.get(rel.parentTaskId)!.push(node);
        } else {
          ungrouped.push(node);
        }
      }

      for (const [intermediateId, childNodes] of grouped) {
        const intInfo = await getTaskInfo(intermediateId);
        if (intInfo) {
          extraChildren.push({
            ...intInfo,
            isFinal: intInfo.isFinal ?? false,
            fieldName: 'Связь из чата',
            nodes: childNodes,
          });
        }
      }

      children = [...children, ...ungrouped, ...extraChildren];
    }

    const ownFieldLinks = await db
      .select({
        linkedTaskId: taskFieldValues.value,
        taskRelationType: formFields.taskRelationType,
        fieldName: formFields.name,
      })
      .from(taskFieldValues)
      .innerJoin(formFields, eq(taskFieldValues.fieldId, formFields.id))
      .where(and(
        eq(taskFieldValues.taskId, taskId),
        eq(formFields.type, 'task'),
        isNotNull(formFields.taskRelationType),
      ));

    const parseLinkedId = (raw: unknown): number | null => {
      if (raw === null || raw === undefined || raw === '') return null;
      if (typeof raw === 'number') return isNaN(raw) ? null : Math.trunc(raw);
      const s = String(raw);
      try {
        const parsed = JSON.parse(s);
        const n = parseInt(String(parsed));
        return isNaN(n) ? null : n;
      } catch {
        const n = parseInt(s);
        return isNaN(n) ? null : n;
      }
    };

    const collectTreeIds = (nodes: RelatedTreeNode[]): number[] => {
      const ids: number[] = [];
      for (const node of nodes) {
        ids.push(node.id);
        ids.push(...collectTreeIds(node.nodes));
      }
      return ids;
    };

    const parentIds = new Set(collectTreeIds(parents));
    const childIds = new Set(collectTreeIds(children));

    for (const link of ownFieldLinks) {
      const linkedId = parseLinkedId(link.linkedTaskId);
      if (!linkedId) continue;
      if (link.taskRelationType === 'parent' && !parentIds.has(linkedId)) {
        const info = await getTaskInfo(linkedId);
        if (info) {
          parents = [...parents, { ...info, isFinal: info.isFinal ?? false, fieldName: link.fieldName ?? 'Связанная задача', nodes: [] }];
          parentIds.add(linkedId);
        }
      } else if (link.taskRelationType === 'child' && !childIds.has(linkedId)) {
        const info = await getTaskInfo(linkedId);
        if (info) {
          children = [...children, { ...info, isFinal: info.isFinal ?? false, fieldName: link.fieldName ?? 'Связанная задача', nodes: [] }];
          childIds.add(linkedId);
        }
      }
    }

    const taskIdStr = String(taskId);
    const taskIdJsonStr = JSON.stringify(taskIdStr);
    const inboundFieldLinksWithValue = await db
      .select({
        sourceTaskId: taskFieldValues.taskId,
        linkedTaskValue: taskFieldValues.value,
        taskRelationType: formFields.taskRelationType,
        fieldName: formFields.name,
      })
      .from(taskFieldValues)
      .innerJoin(formFields, eq(taskFieldValues.fieldId, formFields.id))
      .where(and(
        eq(formFields.type, 'task'),
        isNotNull(formFields.taskRelationType),
        or(
          eq(taskFieldValues.value, taskIdStr),
          eq(taskFieldValues.value, taskIdJsonStr),
        ),
      ));

    for (const link of inboundFieldLinksWithValue) {
      if (link.taskRelationType === 'parent' && !childIds.has(link.sourceTaskId)) {
        const info = await getTaskInfo(link.sourceTaskId);
        if (info) {
          children = [...children, { ...info, isFinal: info.isFinal ?? false, fieldName: link.fieldName ?? 'Связанная задача', nodes: [] }];
          childIds.add(link.sourceTaskId);
        }
      } else if (link.taskRelationType === 'child' && !parentIds.has(link.sourceTaskId)) {
        const info = await getTaskInfo(link.sourceTaskId);
        if (info) {
          parents = [...parents, { ...info, isFinal: info.isFinal ?? false, fieldName: link.fieldName ?? 'Связанная задача', nodes: [] }];
          parentIds.add(link.sourceTaskId);
        }
      }
    }

    return { parents, children };
  }

  // External Services
  async getExternalServices(organizationId: number): Promise<ExternalService[]> {
    return await db
      .select()
      .from(externalServices)
      .where(eq(externalServices.organizationId, organizationId))
      .orderBy(asc(externalServices.serviceName));
  }

  async getExternalService(id: number, organizationId: number): Promise<ExternalService | undefined> {
    const [service] = await db
      .select()
      .from(externalServices)
      .where(and(
        eq(externalServices.id, id),
        eq(externalServices.organizationId, organizationId)
      ));
    return service || undefined;
  }

  async getExternalServiceByType(serviceType: string, organizationId: number): Promise<ExternalService | undefined> {
    const [service] = await db
      .select()
      .from(externalServices)
      .where(and(
        eq(externalServices.serviceType, serviceType),
        eq(externalServices.organizationId, organizationId),
        eq(externalServices.isActive, true)
      ));
    return service || undefined;
  }

  async createExternalService(service: InsertExternalService): Promise<ExternalService> {
    const [created] = await db
      .insert(externalServices)
      .values(service)
      .returning();
    return created;
  }

  async updateExternalService(id: number, organizationId: number, updates: Partial<ExternalService>): Promise<ExternalService> {
    const [updated] = await db
      .update(externalServices)
      .set({ ...updates, updatedAt: new Date() })
      .where(and(
        eq(externalServices.id, id),
        eq(externalServices.organizationId, organizationId)
      ))
      .returning();
    return updated;
  }

  async deleteExternalService(id: number, organizationId: number): Promise<void> {
    await db
      .delete(externalServices)
      .where(and(
        eq(externalServices.id, id),
        eq(externalServices.organizationId, organizationId)
      ));
  }

  // === Regular Table Rows ===
  async getRegularTableRows(taskId: number, tabId: number): Promise<RegularTableRow[]> {
    return db
      .select()
      .from(regularTableRows)
      .where(and(
        eq(regularTableRows.taskId, taskId),
        eq(regularTableRows.tabId, tabId)
      ))
      .orderBy(asc(regularTableRows.position));
  }

  async getRegularTableRow(id: number, taskId: number, tabId: number): Promise<RegularTableRow | undefined> {
    const [row] = await db
      .select()
      .from(regularTableRows)
      .where(and(
        eq(regularTableRows.id, id),
        eq(regularTableRows.taskId, taskId),
        eq(regularTableRows.tabId, tabId)
      ));
    return row || undefined;
  }

  async createRegularTableRow(row: InsertRegularTableRow): Promise<RegularTableRow> {
    const existingRows = await this.getRegularTableRows(row.taskId, row.tabId);
    const maxPosition = existingRows.length > 0 
      ? Math.max(...existingRows.map(r => r.position)) 
      : -1;
    
    const [created] = await db
      .insert(regularTableRows)
      .values({
        ...row,
        position: row.position ?? maxPosition + 1,
      })
      .returning();
    return created;
  }

  async updateRegularTableRow(id: number, taskId: number, tabId: number, updates: Partial<RegularTableRow>): Promise<RegularTableRow> {
    const [updated] = await db
      .update(regularTableRows)
      .set({ ...updates, updatedAt: new Date() })
      .where(and(
        eq(regularTableRows.id, id),
        eq(regularTableRows.taskId, taskId),
        eq(regularTableRows.tabId, tabId)
      ))
      .returning();
    
    if (!updated) {
      throw new Error("Строка таблицы не найдена");
    }
    return updated;
  }

  async deleteRegularTableRow(id: number, taskId: number, tabId: number): Promise<void> {
    await db
      .delete(regularTableRows)
      .where(and(
        eq(regularTableRows.id, id),
        eq(regularTableRows.taskId, taskId),
        eq(regularTableRows.tabId, tabId)
      ));
  }
}