import { Injectable, UnauthorizedException } from '@nestjs/common';
import { ConfigService } from '@nestjs/config';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import type { DataVisibility } from '@mento/shared';
import { BillingService } from '../billing/billing.service';
import {
  resolveAllSectionAccess,
  sectionNeedsTeamPeers,
} from '../common/data-access';
import {
  type Actor,
  normalizeDataVisibility,
  parseVisibilityScopes,
} from '../common/record-scope';
import { PrismaService } from '../prisma/prisma.service';
import { DATA_SCOPES, canViewAllRecords } from '@mento/shared';

export type JwtPayload = {
  sub: string;
  organizationId: string;
  role: string;
  impersonatorUserId?: string;
  viewAsReadOnly?: boolean;
};

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor(
    config: ConfigService,
    private readonly prisma: PrismaService,
    private readonly billing: BillingService,
  ) {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: config.get<string>('JWT_SECRET') ?? 'dev-secret',
    });
  }

  async validate(payload: JwtPayload & { typ?: string; mobile?: string; iat?: number }) {
    if (
      payload.typ === 'portal' ||
      payload.typ === 'org-select' ||
      payload.typ === 'platform-admin'
    ) {
      throw new UnauthorizedException();
    }
    if (!payload.sub || !payload.organizationId) {
      throw new UnauthorizedException();
    }

    let impersonatorUserId: string | undefined;
    let impersonatorRole: string | undefined;
    const viewAsReadOnly = Boolean(payload.viewAsReadOnly && payload.impersonatorUserId);
    if (viewAsReadOnly && payload.impersonatorUserId) {
      const ownerMembership = await this.prisma.membership.findFirst({
        where: {
          userId: payload.impersonatorUserId,
          organizationId: payload.organizationId,
          isActive: true,
          role: 'owner',
          organization: { isActive: true },
        },
        select: { userId: true, role: true },
      });
      if (!ownerMembership) {
        throw new UnauthorizedException();
      }
      impersonatorUserId = ownerMembership.userId;
      impersonatorRole = ownerMembership.role;
    }

    const user = await this.prisma.user.findUnique({
      where: { id: payload.sub },
      select: { id: true, isActive: true },
    });
    if (!user || user.isActive === false) {
      throw new UnauthorizedException();
    }
    const membership = await this.prisma.membership.findFirst({
      where: {
        userId: user.id,
        organizationId: payload.organizationId,
        isActive: true,
        organization: { isActive: true },
      },
      select: {
        organizationId: true,
        role: true,
        dataVisibility: true,
        dataVisibilityScopes: true,
        dataAccessOverride: true,
        priorArchiveEnabled: true,
        priorArchiveLens: true,
        orgRole: { select: { dataAccessPolicy: true } },
        organization: { select: { enabledModules: true, priorArchiveEnabledAt: true } },
      },
    });
    if (!membership) {
      throw new UnauthorizedException();
    }
    await this.billing.requireActiveForOrganization(membership.organizationId);

    const dataVisibility = normalizeDataVisibility(membership.dataVisibility);
    const scopeLevels = parseVisibilityScopes(membership.dataVisibilityScopes);
    const elevatedRole = canViewAllRecords(membership.role);

    let teamIds: string[] | undefined;
    const resolve = async (level: DataVisibility): Promise<string[] | null> => {
      if (elevatedRole || level === 'org') return null;
      if (level === 'own') return [user.id];
      teamIds ??= await this.teamPeerIds(membership.organizationId, user.id);
      return teamIds;
    };

    const visibleUserIds = await resolve(dataVisibility);
    const scopes: Actor['scopes'] = {};
    if (!elevatedRole) {
      for (const scope of DATA_SCOPES) {
        const level = scopeLevels[scope];
        if (!level || level === dataVisibility) continue;
        scopes[scope] = { dataVisibility: level, visibleUserIds: await resolve(level) };
      }
    }

    const deepAccess = resolveAllSectionAccess({
      role: membership.role,
      rolePolicy: membership.orgRole?.dataAccessPolicy,
      override: membership.dataAccessOverride,
      legacyVisibility: dataVisibility,
      legacyScopes: scopeLevels,
    });
    const needsTeamPeers =
      !elevatedRole &&
      (sectionNeedsTeamPeers(deepAccess.customers) ||
        sectionNeedsTeamPeers(deepAccess.leads) ||
        sectionNeedsTeamPeers(deepAccess.sales) ||
        sectionNeedsTeamPeers(deepAccess.activities) ||
        sectionNeedsTeamPeers(deepAccess.notes) ||
        sectionNeedsTeamPeers(deepAccess.routines) ||
        sectionNeedsTeamPeers(deepAccess.projects) ||
        sectionNeedsTeamPeers(deepAccess.tickets));
    if (needsTeamPeers) {
      teamIds ??= await this.teamPeerIds(membership.organizationId, user.id);
    }

    const modules = this.billing.normalizeModules(membership.organization.enabledModules);
    const priorGranted =
      modules.includes('prior_data_archive') && membership.priorArchiveEnabled;
    const priorLens = membership.priorArchiveLens === 'archive' ? 'archive' : 'current';

    return {
      userId: user.id,
      organizationId: membership.organizationId,
      role: membership.role,
      dataVisibility,
      visibleUserIds,
      scopes,
      customersAccess: deepAccess.customers,
      leadsAccess: deepAccess.leads,
      salesAccess: deepAccess.sales,
      activitiesAccess: deepAccess.activities,
      notesAccess: deepAccess.notes,
      routinesAccess: deepAccess.routines,
      projectsAccess: deepAccess.projects,
      ticketsAccess: deepAccess.tickets,
      teamPeerIds: teamIds ?? (elevatedRole ? null : [user.id]),
      priorLens: priorGranted ? priorLens : 'off',
      priorCutoff:
        priorGranted && membership.organization.priorArchiveEnabledAt
          ? membership.organization.priorArchiveEnabledAt
          : null,
      sessionStartedAt: payload.iat ? new Date(payload.iat * 1000) : new Date(),
      ...(viewAsReadOnly && impersonatorUserId
        ? {
            impersonatorUserId,
            impersonatorRole: impersonatorRole ?? 'owner',
            viewAsReadOnly: true,
          }
        : {}),
    };
  }

  private async teamPeerIds(organizationId: string, userId: string): Promise<string[]> {
    const memberships = await this.prisma.teamMember.findMany({
      where: {
        userId,
        team: { organizationId },
      },
      select: { teamId: true },
    });
    if (!memberships.length) return [userId];

    const peers = await this.prisma.teamMember.findMany({
      where: {
        teamId: { in: memberships.map((m) => m.teamId) },
      },
      select: { userId: true },
    });
    return [...new Set([userId, ...peers.map((p) => p.userId)])];
  }
}