/**
 * Queries de transactions (transações do sistema de escrow)
 * Operações para a tabela transactions
 */

import { query } from "../index";

export interface Transaction {
  transaction_id: number;
  listing_id: number | null;
  buyer_id: number;
  seller_id: number;
  item_name: string;
  quantity: number;
  server_name: string;
  amount: number;
  payment_method: "pix" | "tibia_coins" | "gold_coins" | null;
  escrow_fee: number | null;
  transaction_status:
    | "pending"
    | "deposited"
    | "item_delivered"
    | "completed"
    | "disputed"
    | "cancelled"
    | "refunded";
  created_at: Date;
  deposited_at: Date | null;
  delivered_at: Date | null;
  completed_at: Date | null;
  buyer_confirmed: boolean;
  seller_confirmed: boolean;
  buyer_notes: string | null;
  seller_notes: string | null;
}

export interface CreateTransactionData {
  listing_id?: number;
  buyer_id: number;
  seller_id: number;
  item_name: string;
  quantity: number;
  server_name: string;
  amount: number;
  payment_method: "pix" | "tibia_coins" | "gold_coins";
  escrow_fee?: number;
}

export interface UpdateTransactionStatusData {
  transaction_status: Transaction["transaction_status"];
  deposited_at?: Date;
  delivered_at?: Date;
  completed_at?: Date;
  buyer_confirmed?: boolean;
  seller_confirmed?: boolean;
  buyer_notes?: string;
  seller_notes?: string;
}

/**
 * Cria uma nova transação
 */
export async function createTransaction(
  data: CreateTransactionData,
): Promise<Transaction> {
  // Calcular escrow_fee se não fornecido (2% do valor)
  const escrowFee = data.escrow_fee ?? Number((data.amount * 0.02).toFixed(2));

  const result = await query<Transaction>(
    `
    INSERT INTO transactions (
      listing_id, buyer_id, seller_id, item_name, quantity,
      server_name, amount, payment_method, escrow_fee
    )
    VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
    RETURNING *
    `,
    [
      data.listing_id || null,
      data.buyer_id,
      data.seller_id,
      data.item_name,
      data.quantity,
      data.server_name,
      data.amount,
      data.payment_method,
      escrowFee,
    ],
  );

  return result.rows[0];
}

/**
 * Busca transação por ID
 */
export async function getTransactionById(
  transactionId: number,
): Promise<Transaction | null> {
  const result = await query<Transaction>(
    `
    SELECT * FROM transactions WHERE transaction_id = $1
    `,
    [transactionId],
  );

  return result.rows[0] || null;
}

/**
 * Atualiza status da transação
 */
export async function updateTransactionStatus(
  transactionId: number,
  data: UpdateTransactionStatusData,
): Promise<Transaction | null> {
  const updates: string[] = [];
  const params: any[] = [];
  let paramIndex = 1;

  updates.push(`transaction_status = $${paramIndex}`);
  params.push(data.transaction_status);
  paramIndex++;

  if (data.deposited_at !== undefined) {
    updates.push(`deposited_at = $${paramIndex}`);
    params.push(data.deposited_at);
    paramIndex++;
  }

  if (data.delivered_at !== undefined) {
    updates.push(`delivered_at = $${paramIndex}`);
    params.push(data.delivered_at);
    paramIndex++;
  }

  if (data.completed_at !== undefined) {
    updates.push(`completed_at = $${paramIndex}`);
    params.push(data.completed_at);
    paramIndex++;
  }

  if (data.buyer_confirmed !== undefined) {
    updates.push(`buyer_confirmed = $${paramIndex}`);
    params.push(data.buyer_confirmed);
    paramIndex++;
  }

  if (data.seller_confirmed !== undefined) {
    updates.push(`seller_confirmed = $${paramIndex}`);
    params.push(data.seller_confirmed);
    paramIndex++;
  }

  if (data.buyer_notes !== undefined) {
    updates.push(`buyer_notes = $${paramIndex}`);
    params.push(data.buyer_notes);
    paramIndex++;
  }

  if (data.seller_notes !== undefined) {
    updates.push(`seller_notes = $${paramIndex}`);
    params.push(data.seller_notes);
    paramIndex++;
  }

  params.push(transactionId);
  const result = await query<Transaction>(
    `
    UPDATE transactions
    SET ${updates.join(", ")}
    WHERE transaction_id = $${paramIndex}
    RETURNING *
    `,
    params,
  );

  return result.rows[0] || null;
}

/**
 * Busca transações de um usuário (comprador ou vendedor)
 */
export async function getTransactionsByUser(
  userId: number,
  filters: {
    role?: "buyer" | "seller" | "both";
    status?: Transaction["transaction_status"];
    page?: number;
    pageSize?: number;
  } = {},
): Promise<{ transactions: Transaction[]; total: number }> {
  const { role = "both", status, page = 1, pageSize = 20 } = filters;

  const conditions: string[] = [];
  const params: any[] = [];
  let paramIndex = 1;

  if (role === "buyer") {
    conditions.push(`buyer_id = $${paramIndex}`);
  } else if (role === "seller") {
    conditions.push(`seller_id = $${paramIndex}`);
  } else {
    conditions.push(
      `(buyer_id = $${paramIndex} OR seller_id = $${paramIndex})`,
    );
  }
  params.push(userId);
  paramIndex++;

  if (status) {
    conditions.push(`transaction_status = $${paramIndex}`);
    params.push(status);
    paramIndex++;
  }

  const whereClause =
    conditions.length > 0 ? `WHERE ${conditions.join(" AND ")}` : "";

  // Contar total
  const countResult = await query<{ count: string }>(
    `SELECT COUNT(*) as count FROM transactions ${whereClause}`,
    params,
  );
  const total = parseInt(countResult.rows[0].count, 10);

  // Buscar transações
  const offset = (page - 1) * pageSize;
  const result = await query<Transaction>(
    `
    SELECT * FROM transactions
    ${whereClause}
    ORDER BY created_at DESC
    LIMIT $${paramIndex} OFFSET $${paramIndex + 1}
    `,
    [...params, pageSize, offset],
  );

  return {
    transactions: result.rows,
    total,
  };
}