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Vitess client including quill bindings.
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/*
 * Copyright 2016-2017 Dan Di Spaltro
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dispalt.vitess

import java.nio.ByteBuffer
import java.util.UUID

import com.google.common.primitives.UnsignedLong
import com.google.protobuf.ByteString
import com.youtube.vitess.proto.query.{BindVariable, BoundQuery, Type, Value}

object Proto {

  /**
    * bindQuery creates a BoundQuery from query and vars.
    */
  def bindQuery(query: String, vars: Map[String, _]): BoundQuery = {
    val m = vars.map { p =>
      (p._1, buildBindVariable(p._2))
    }
    BoundQuery(query, m)
  }

  def buildBindVariable(value: Any): BindVariable = {
    value match {
      case b: BindVariable => b
      case b: TraversableOnce[_] if b.nonEmpty =>
        val bv = BindVariable(Type.TUPLE)
        val v = b map { f =>
          typedValue(f)
        }
        bv.addAllValues(v)
      case f =>
        val tv = typedValueTuple(f)
        BindVariable(tv._1, tv._2)
    }
  }

  def typedValueTuple(obj: Any): (Type, ByteString) = {
    val p = obj match {
      case null            => (Type.NULL_TYPE, ByteString.EMPTY)
      case s: String       => (Type.VARCHAR, ByteString.copyFromUtf8(s))
      case v: Array[Byte]  => (Type.VARBINARY, ByteString.copyFrom(v))
      case n: UnsignedLong => (Type.UINT64, ByteString.copyFromUtf8(n.toString))
      case n: Float        => (Type.FLOAT64, ByteString.copyFromUtf8(n.toString))
      case n: Double       => (Type.FLOAT64, ByteString.copyFromUtf8(n.toString))
      case b: Boolean      => (Type.INT64, ByteString.copyFromUtf8(if (b) "1" else "0"))
      case b: BigDecimal =>
        val res = if (b.scale > MAX_DECIMAL_UNIT) {
          // MySQL only supports scale up to 30.
          b.setScale(MAX_DECIMAL_UNIT, BigDecimal.RoundingMode.HALF_UP)
        } else b

        Type.DECIMAL -> ByteString.copyFromUtf8(res.toString)
      case n: Number => (Type.INT64, ByteString.copyFromUtf8(n.toString))
      case n: UUID =>
        val bb = ByteBuffer.wrap(new Array[Byte](16))
        bb.putLong(n.getMostSignificantBits)
        bb.putLong(n.getLeastSignificantBits)
        (Type.BINARY, ByteString.copyFrom(bb.array()))
      case _         => throw new IllegalArgumentException("unsupported type for Value proto: " + obj.getClass)

    }
    p
  }

  def typedValue(obj: Any): Value = {
    val v = typedValueTuple(obj)
    Value(v._1, v._2)
  }

  private final val MAX_DECIMAL_UNIT = 30
}