import { Injectable } from '@nestjs/common';
import { randomUUID } from 'node:crypto';

import type { Prisma } from '../../../../generated/prisma/client';
import type { TbankSyncAttempt } from '../../../integrations/tbank/tbank.api';
import type { InvestmentScreenDto } from './tbank-sync.dto';

import { PrismaService } from '../../../prisma/prisma.service';
export type ScreenIntent = { now: string; scope: InvestmentScreenDto };
export type ScreenProgress = {
  attempts?: Record<string, string>;
  children: string[];
  dispatched: boolean;
};
@Injectable()
export class TbankSyncRepository {
  constructor(private readonly prisma: PrismaService) {}
  reserve(
    userId: string,
    revision: string,
    scope: InvestmentScreenDto,
    runId: string,
  ) {
    return this.prisma.$transaction(async (tx) => {
      const valid = await tx.tbankConnection.updateMany({
        where: { userId, revision, invalidToken: false },
        data: { membershipRevision: { increment: 0 } },
      });
      if (!valid.count) return null;
      const scopeKey = `screen:${JSON.stringify(scope)}`;
      const key = { userId, revision, scopeKey };
      const previous = await tx.tbankSyncWork.findUnique({
        where: { userId_revision_scopeKey: key },
      });
      if (previous?.state === 'running' && previous.processRunId === runId) {
        const progress = previous.progress as ScreenProgress;
        const children = progress.children ?? [];
        if (
          !progress.dispatched ||
          (await tx.tbankSyncWork.count({
            where: { userId, revision, id: { in: children }, state: 'running' },
          }))
        ) {
          return { work: previous, launch: false };
        }
      }
      const data = {
        attemptId: randomUUID(),
        processRunId: runId,
        state: 'running',
        priority: 0,
        intent: JSON.parse(
          JSON.stringify({ scope, now: new Date().toISOString() }),
        ) as Prisma.InputJsonObject,
        progress: { children: [], dispatched: false },
        errorCode: null,
      };
      const work = await tx.tbankSyncWork.upsert({
        where: { userId_revision_scopeKey: key },
        create: { ...key, ...data, id: randomUUID() },
        update: { ...data, id: randomUUID() },
      });
      return { work, launch: true };
    });
  }

  read(userId: string, revision: string, id: string) {
    return this.prisma.$transaction(async (tx) => {
      const work = await tx.tbankSyncWork.findFirst({
        where: { userId, revision, id },
      });
      if (!work) return null;
      const progress = work.progress as ScreenProgress;
      const children = await tx.tbankSyncWork.findMany({
        where: { userId, revision, id: { in: progress.children ?? [] } },
        select: { id: true, attemptId: true, state: true, errorCode: true },
      });
      return {
        work,
        children: children.map((child) =>
          progress.attempts?.[child.id] &&
          progress.attempts[child.id] !== child.attemptId
            ? { ...child, state: 'cancelled', errorCode: null }
            : child,
        ),
        progress,
      };
    });
  }

  async progress(
    attempt: TbankSyncAttempt,
    children: string[],
    dispatched: boolean,
    errorCode: null | string = null,
  ) {
    return this.prisma.$transaction(async (tx) => {
      const previous = await tx.tbankSyncWork.findFirst({ where: attempt });
      if (!previous) return { count: 0 };
      const old = previous.progress as ScreenProgress;
      const rows = await tx.tbankSyncWork.findMany({
        where: {
          userId: attempt.userId,
          revision: attempt.revision,
          id: { in: children },
        },
        select: { id: true, attemptId: true },
      });
      const attempts = {
        ...Object.fromEntries(rows.map((row) => [row.id, row.attemptId])),
        ...old.attempts,
      };
      return tx.tbankSyncWork.updateMany({
        where: {
          ...attempt,
          state: 'running',
          connection: { invalidToken: false },
        },
        data: {
          progress: { children: [...new Set(children)], attempts, dispatched },
          ...(errorCode ? { state: 'failed', errorCode } : {}),
        },
      });
    });
  }
}