import { createHash } from "node:crypto";
import { HttpStatus, Inject, Injectable } from "@nestjs/common";
import { ErrorCode } from "@drift/contracts";
import { Prisma } from "@prisma/client";
import { DomainException } from "../common/domain.exception.js";
import { PrismaService } from "../database/prisma.service.js";
import { SafetyLockService } from "../safety/safety-lock.service.js";
import type { ResolveReportDto, SanctionDto } from "./dto.js";
import { NotificationService } from "../notification/notification.service.js";
@Injectable()
export class AdminService {
  constructor(
    @Inject(PrismaService) private readonly prisma: PrismaService,
    @Inject(SafetyLockService) private readonly locks: SafetyLockService,
    @Inject(NotificationService)
    private readonly notifications: NotificationService,
  ) {}
  async reports(
    actorId: string,
    status: "PENDING" | "REVIEWING" | "RESOLVED" | "DISMISSED" | undefined,
    limit: number,
  ) {
    const rows = await this.prisma.report.findMany({
      where: status ? { status } : {},
      orderBy: [{ createdAt: "asc" }, { id: "asc" }],
      take: limit,
    });
    await this.prisma.auditLog.create({
      data: {
        actorId,
        action: "REPORTS_QUERIED",
        entityType: "REPORT",
        metadata: { status: status ?? null, limit, resultCount: rows.length },
      },
    });
    return {
      items: rows.map((x) => ({
        id: x.id,
        status: x.status,
        reason: x.reason,
        details: x.details,
        targetSnapshot: x.targetSnapshot,
        resolution: x.resolution,
        createdAt: x.createdAt,
      })),
    };
  }
  async resolve(actorId: string, id: string, dto: ResolveReportDto) {
    if (dto.decision === "DISMISSED" && dto.sanction)
      throw new DomainException(
        ErrorCode.VALIDATION_ERROR,
        "Invalid sanction",
        HttpStatus.BAD_REQUEST,
      );
    return this.prisma.$transaction(
      async (tx) => {
        const report = await tx.report.findUnique({ where: { id } });
        if (!report)
          throw new DomainException(
            ErrorCode.NOT_FOUND,
            "Not found",
            HttpStatus.NOT_FOUND,
          );
        const accountId =
          report.reportedAccountId ??
          (report.messageId
            ? (
                await tx.message.findUnique({
                  where: { id: report.messageId },
                  select: { senderId: true },
                })
              )?.senderId
            : report.bottleId
              ? (
                  await tx.bottle.findUnique({
                    where: { id: report.bottleId },
                    select: { authorId: true },
                  })
                )?.authorId
              : report.conversationId
                ? (
                    await tx.anonymousProfile.findUnique({
                      where: {
                        publicId:
                          (
                            report.targetSnapshot as {
                              subjectPublicId?: string;
                            }
                          ).subjectPublicId ??
                          "00000000-0000-0000-0000-000000000000",
                      },
                      select: { accountId: true },
                    })
                  )?.accountId
                : undefined);
        await this.locks.lockAccounts(tx, [
          actorId,
          ...(accountId ? [accountId] : []),
        ]);
        const changed = await tx.report.updateMany({
          where: { id, status: { in: ["PENDING", "REVIEWING"] } },
          data: {
            status: dto.decision === "UPHELD" ? "RESOLVED" : "DISMISSED",
            resolution: dto.resolution,
          },
        });
        if (changed.count !== 1)
          throw new DomainException(
            ErrorCode.IDEMPOTENCY_CONFLICT,
            "Report already resolved",
            HttpStatus.CONFLICT,
          );
        const task = await tx.moderationTask.update({
          where: {
            targetType_targetId: { targetType: "REPORT", targetId: id },
          },
          data: {
            status: "COMPLETED",
            decision: dto.decision,
            result: { decision: dto.decision },
            assignedToId: actorId,
            reviewedAt: new Date(),
          },
        });
        if (dto.decision === "UPHELD" && dto.sanction && accountId)
          await this.issue(tx, actorId, accountId, dto.sanction, task.id);
        await tx.auditLog.create({
          data: {
            actorId,
            action: "REPORT_RESOLVED",
            entityType: "REPORT",
            entityId: id,
            metadata: {
              decision: dto.decision,
              sanctionType: dto.sanction?.type,
            },
          },
        });
        await this.notifications.createInApp(
          tx,
          report.reporterId,
          `report:${id}:reporter`,
          "REPORT_RESOLVED",
          { reportId: id, decision: dto.decision },
        );
        if (dto.decision === "UPHELD" && dto.sanction && accountId)
          await this.notifications.createInApp(
            tx,
            accountId,
            `report:${id}:target`,
            "ACCOUNT_ACTION",
            { type: "ACCOUNT_ACTION" },
          );
        return tx.report.findUniqueOrThrow({
          where: { id },
          select: { id: true, status: true, resolution: true },
        });
      },
      { isolationLevel: Prisma.TransactionIsolationLevel.Serializable },
    );
  }
  async sanctions(actorId: string, publicId: string, dto: SanctionDto) {
    const profile = await this.prisma.anonymousProfile.findUnique({
      where: { publicId },
    });
    if (!profile)
      throw new DomainException(
        ErrorCode.NOT_FOUND,
        "Not found",
        HttpStatus.NOT_FOUND,
      );
    return this.prisma.$transaction(async (tx) => {
      await this.locks.lockAccounts(tx, [actorId, profile.accountId]);
      const sanction = await this.issue(tx, actorId, profile.accountId, dto);
      await this.notifications.createInApp(
        tx,
        profile.accountId,
        `sanction:${sanction.id}:account-action`,
        "ACCOUNT_ACTION",
        { type: "ACCOUNT_ACTION" },
      );
      await tx.auditLog.create({
        data: {
          actorId,
          action: "SANCTION_ISSUED",
          entityType: "ACCOUNT",
          entityId: profile.accountId,
          metadata: { type: dto.type },
        },
      });
      return sanction;
    });
  }
  async moderation(actorId: string, limit: number) {
    const items = await this.prisma.moderationTask.findMany({
      where: {
        status: "COMPLETED",
        decision: "MANUAL_REVIEW",
        targetType: { in: ["PROFILE", "BOTTLE"] },
      },
      select: {
        id: true,
        targetType: true,
        targetId: true,
        riskLabels: true,
        createdAt: true,
      },
      orderBy: { createdAt: "asc" },
      take: limit,
    });
    await this.prisma.auditLog.create({
      data: {
        actorId,
        action: "MODERATION_QUERIED",
        entityType: "MODERATION_TASK",
        metadata: { limit, resultCount: items.length },
      },
    });
    return { items };
  }
  async moderate(
    actorId: string,
    id: string,
    decision: "APPROVED" | "REJECTED",
    reason: string,
  ) {
    return this.prisma.$transaction(async (tx) => {
      // Only the worker's terminal MANUAL_REVIEW result may be overridden. The
      // outbox must already be published, so no leased worker can later write
      // a stale moderation decision over the administrator's decision.
      const task = await tx.moderationTask.findUnique({ where: { id } });
      if (
        !task ||
        task.status !== "COMPLETED" ||
        task.decision !== "MANUAL_REVIEW" ||
        (task.targetType !== "BOTTLE" && task.targetType !== "PROFILE")
      )
        throw new DomainException(
          ErrorCode.IDEMPOTENCY_CONFLICT,
          "Task not awaiting manual review",
          HttpStatus.CONFLICT,
        );
      const event = await tx.outboxEvent.findFirst({
        where: {
          eventType:
            task.targetType === "BOTTLE"
              ? "BOTTLE_MODERATION_REQUESTED"
              : "PROFILE_MODERATION_REQUESTED",
          aggregateId: task.targetId,
          status: "PUBLISHED",
          payload: { path: ["taskId"], equals: task.id },
        },
      });
      if (!event)
        throw new DomainException(
          ErrorCode.IDEMPOTENCY_CONFLICT,
          "Moderation event not published",
          HttpStatus.CONFLICT,
        );
      if (task.targetType === "BOTTLE") {
        const bottle = await tx.bottle.findUnique({
          where: { id: task.targetId },
        });
        if (
          !bottle ||
          bottle.reviewStatus !== "MANUAL_REVIEW" ||
          bottle.poolStatus !== "CLOSED" ||
          task.payloadHash !==
            createHash("sha256").update(bottle.contentText).digest("hex")
        )
          throw new DomainException(
            ErrorCode.IDEMPOTENCY_CONFLICT,
            "Bottle state changed",
            HttpStatus.CONFLICT,
          );
        const updated = await tx.bottle.updateMany({
          where: {
            id: bottle.id,
            reviewStatus: "MANUAL_REVIEW",
            poolStatus: "CLOSED",
            contentText: bottle.contentText,
          },
          data: {
            reviewStatus: decision,
            poolStatus: decision === "APPROVED" ? "IN_POOL" : "CLOSED",
            approvedAt: decision === "APPROVED" ? new Date() : null,
          },
        });
        if (updated.count !== 1)
          throw new DomainException(
            ErrorCode.IDEMPOTENCY_CONFLICT,
            "Bottle state changed",
            HttpStatus.CONFLICT,
          );
      } else {
        const profile = await tx.anonymousProfile.findUnique({
          where: { id: task.targetId },
        });
        const hash =
          profile &&
          createHash("sha256")
            .update(
              JSON.stringify([
                profile.nickname,
                profile.avatarColor,
                profile.bio,
              ]),
            )
            .digest("hex");
        const version = Number(
          event.dedupeKey.slice(event.dedupeKey.lastIndexOf(":") + 1),
        );
        if (
          !profile ||
          profile.reviewStatus !== "MANUAL_REVIEW" ||
          profile.version !== version ||
          hash !== task.payloadHash
        )
          throw new DomainException(
            ErrorCode.IDEMPOTENCY_CONFLICT,
            "Profile state changed",
            HttpStatus.CONFLICT,
          );
        const updated = await tx.anonymousProfile.updateMany({
          where: { id: profile.id, reviewStatus: "MANUAL_REVIEW", version },
          data: { reviewStatus: decision },
        });
        if (updated.count !== 1)
          throw new DomainException(
            ErrorCode.IDEMPOTENCY_CONFLICT,
            "Profile state changed",
            HttpStatus.CONFLICT,
          );
      }
      const changed = await tx.moderationTask.updateMany({
        where: {
          id,
          status: "COMPLETED",
          decision: "MANUAL_REVIEW",
          payloadHash: task.payloadHash,
        },
        data: {
          decision,
          result: { decision },
          assignedToId: actorId,
          reviewedAt: new Date(),
        },
      });
      if (changed.count !== 1)
        throw new DomainException(
          ErrorCode.IDEMPOTENCY_CONFLICT,
          "Task already resolved",
          HttpStatus.CONFLICT,
        );
      await tx.auditLog.create({
        data: {
          actorId,
          action: "MODERATION_RESOLVED",
          entityType: task.targetType,
          entityId: task.targetId,
          metadata: {
            decision,
            reason,
            previousDecision: "MANUAL_REVIEW",
            eventId: event.id,
          },
        },
      });
      return { id, status: "COMPLETED", decision };
    });
  }
  private async issue(
    tx: Prisma.TransactionClient,
    actorId: string,
    accountId: string,
    dto: SanctionDto,
    moderationTaskId?: string,
  ) {
    if (
      dto.expiresAt &&
      (new Date(dto.expiresAt).getTime() <= Date.now() ||
        new Date(dto.expiresAt).getTime() >
          Date.now() + 365 * 24 * 60 * 60 * 1000)
    )
      throw new DomainException(
        ErrorCode.VALIDATION_ERROR,
        "Invalid sanction expiry",
        HttpStatus.BAD_REQUEST,
      );
    const sanction = await tx.sanction.create({
      data: {
        accountId,
        issuedById: actorId,
        moderationTaskId: moderationTaskId ?? null,
        type: dto.type,
        reason: dto.reason,
        expiresAt: dto.expiresAt ? new Date(dto.expiresAt) : null,
      },
    });
    if (dto.type === "SUSPENSION" || dto.type === "BAN") {
      await tx.account.update({
        where: { id: accountId },
        data: { tokenVersion: { increment: 1 } },
      });
      await tx.session.updateMany({
        where: { accountId, revokedAt: null },
        data: { revokedAt: new Date() },
      });
    }
    return sanction;
  }
}