import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import { getTempUserId } from '../common/user.util';

@Injectable()
export class WalletsService {
  constructor(private prisma: PrismaService) {}

  private userId() {
    return getTempUserId();
  }

  list() {
    return this.prisma.wallet.findMany({
      where: { userId: this.userId(), deletedAt: null },
      orderBy: { createdAt: 'asc' },
    });
  }

  create(input: { name: string; currency?: string; kind?: 'money' | 'asset'; unit?: string; initialAmount?: number; pricePerUnit?: number }) {
    const kind = input.kind ?? 'money';
    return this.prisma.wallet.create({
      data: {
        userId: this.userId(),
        name: input.name,
        kind,
        currency: kind === 'money' ? (input.currency ?? 'IDR') : null,
        unit: kind === 'asset' ? (input.unit ?? null) : null,
        initialAmount: input.initialAmount || null,
        pricePerUnit: kind === 'asset' ? (input.pricePerUnit || null) : null,
      },
    });
  }

  update(id: string, input: { name?: string; currency?: string; kind?: 'money' | 'asset'; unit?: string; initialAmount?: number; pricePerUnit?: number }) {
    const updateData: any = {};
    
    if (input.name !== undefined) updateData.name = input.name;
    if (input.kind !== undefined) {
      updateData.kind = input.kind;
      // Reset currency/unit based on kind
      if (input.kind === 'money') {
        updateData.currency = input.currency ?? 'IDR';
        updateData.unit = null;
      } else {
        updateData.unit = input.unit ?? null;
        updateData.currency = null;
      }
    } else {
      // If kind is not changing, update currency/unit as provided
      if (input.currency !== undefined) updateData.currency = input.currency;
      if (input.unit !== undefined) updateData.unit = input.unit;
    }

    // Handle initialAmount and pricePerUnit
    if (input.initialAmount !== undefined) updateData.initialAmount = input.initialAmount || null;
    if (input.pricePerUnit !== undefined) updateData.pricePerUnit = input.pricePerUnit || null;

    return this.prisma.wallet.update({
      where: { id, userId: this.userId() },
      data: updateData,
    });
  }

  delete(id: string) {
    // Soft delete by setting deletedAt
    return this.prisma.wallet.update({
      where: { id, userId: this.userId() },
      data: { deletedAt: new Date() },
    });
  }
}