/**
 * Queries de Purchase Intentions usando Prisma
 */

import { prisma } from "../app";

export type PurchaseIntentionStatus = "pending" | "accepted" | "rejected" | "expired" | "completed";
export type PaymentMethod = "pix" | "tibia_coins" | "gold_coins" | "trade";

export interface CreatePurchaseIntentionData {
  listing_id: number;
  buyer_id: number;
  payment_method: PaymentMethod;
  buyer_message?: string;
  expires_at?: Date;
}

export interface PurchaseIntention {
  intention_id: number;
  listing_id: number;
  buyer_id: number;
  payment_method: string;
  status: PurchaseIntentionStatus;
  buyer_message: string | null;
  seller_response: string | null;
  created_at: Date;
  updated_at: Date;
  expires_at: Date | null;
  accepted_at: Date | null;
  rejected_at: Date | null;
  // Relacionamentos
  listing?: {
    listing_id: number;
    item_name: string;
    seller_id: number;
  };
  buyer?: {
    user_id: number;
    username: string;
    email: string;
  };
}

/**
 * Cria uma nova intenção de compra
 */
export async function createPurchaseIntention(
  data: CreatePurchaseIntentionData
): Promise<PurchaseIntention> {
  return await prisma.purchaseIntention.create({
    data: {
      listing_id: data.listing_id,
      buyer_id: data.buyer_id,
      payment_method: data.payment_method,
      buyer_message: data.buyer_message || null,
      expires_at: data.expires_at || null,
      status: "pending",
    },
    include: {
      listing: {
        select: {
          listing_id: true,
          item_name: true,
          seller_id: true,
        },
      },
      buyer: {
        select: {
          user_id: true,
          username: true,
          email: true,
        },
      },
    },
  }) as PurchaseIntention;
}

/**
 * Busca intenções de um anúncio específico
 */
export async function getPurchaseIntentionsByListing(
  listingId: number,
  filters: { status?: PurchaseIntentionStatus; limit?: number } = {}
): Promise<PurchaseIntention[]> {
  const { status, limit = 50 } = filters;

  const where: any = { listing_id: listingId };
  if (status) {
    where.status = status;
  }

  return await prisma.purchaseIntention.findMany({
    where,
    include: {
      listing: {
        select: {
          listing_id: true,
          item_name: true,
          seller_id: true,
        },
      },
      buyer: {
        select: {
          user_id: true,
          username: true,
          email: true,
        },
      },
    },
    orderBy: { created_at: "desc" },
    take: limit,
  }) as PurchaseIntention[];
}

/**
 * Busca intenções de um comprador
 */
export async function getPurchaseIntentionsByBuyer(
  buyerId: number,
  filters: { status?: PurchaseIntentionStatus; limit?: number } = {}
): Promise<PurchaseIntention[]> {
  const { status, limit = 50 } = filters;

  const where: any = { buyer_id: buyerId };
  if (status) {
    where.status = status;
  }

  return await prisma.purchaseIntention.findMany({
    where,
    include: {
      listing: {
        select: {
          listing_id: true,
          item_name: true,
          seller_id: true,
        },
      },
      buyer: {
        select: {
          user_id: true,
          username: true,
          email: true,
        },
      },
    },
    orderBy: { created_at: "desc" },
    take: limit,
  }) as PurchaseIntention[];
}

/**
 * Busca uma intenção específica por ID
 */
export async function getPurchaseIntentionById(
  intentionId: number
): Promise<PurchaseIntention | null> {
  return await prisma.purchaseIntention.findUnique({
    where: { intention_id: intentionId },
    include: {
      listing: {
        select: {
          listing_id: true,
          item_name: true,
          seller_id: true,
        },
      },
      buyer: {
        select: {
          user_id: true,
          username: true,
          email: true,
        },
      },
    },
  }) as PurchaseIntention | null;
}

/**
 * Atualiza o status de uma intenção
 */
export async function updatePurchaseIntentionStatus(
  intentionId: number,
  status: PurchaseIntentionStatus,
  sellerResponse?: string
): Promise<PurchaseIntention> {
  const updateData: any = {
    status,
    updated_at: new Date(),
  };

  if (status === "accepted") {
    updateData.accepted_at = new Date();
    updateData.seller_response = sellerResponse || null;
  } else if (status === "rejected") {
    updateData.rejected_at = new Date();
    updateData.seller_response = sellerResponse || null;
  } else if (sellerResponse) {
    updateData.seller_response = sellerResponse;
  }

  return await prisma.purchaseIntention.update({
    where: { intention_id: intentionId },
    data: updateData,
    include: {
      listing: {
        select: {
          listing_id: true,
          item_name: true,
          seller_id: true,
        },
      },
      buyer: {
        select: {
          user_id: true,
          username: true,
          email: true,
        },
      },
    },
  }) as PurchaseIntention;
}

/**
 * Conta intenções pendentes de um anúncio
 */
export async function getPendingIntentionsCount(listingId: number): Promise<number> {
  return await prisma.purchaseIntention.count({
    where: {
      listing_id: listingId,
      status: "pending",
    },
  });
}

/**
 * Verifica se já existe uma intenção pendente para um listing+buyer
 */
export async function hasPendingIntention(
  listingId: number,
  buyerId: number
): Promise<boolean> {
  const count = await prisma.purchaseIntention.count({
    where: {
      listing_id: listingId,
      buyer_id: buyerId,
      status: "pending",
    },
  });

  return count > 0;
}