/*
 * Copyright 2021 Google Inc. All rights reserved.
 *
 * 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.
 */

import Foundation
import XCTest
@testable import FlatBuffers

typealias Test = MyGame_Example_Test
typealias Monster = MyGame_Example_Monster
typealias Vec3 = MyGame_Example_Vec3
typealias Stat = MyGame_Example_Stat

class FlatBuffersMonsterWriterTests: XCTestCase {

  func testData() {
    let data = Data([48, 0, 0, 0, 77, 79, 78, 83, 0, 0, 0, 0, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0])
    let _data = ByteBuffer(data: data)
    readMonster(fb: _data)
  }

  func testReadFromOtherLanguages() {
    let path = FileManager.default.currentDirectoryPath
    let url = URL(fileURLWithPath: path, isDirectory: true).appendingPathComponent("monsterdata_test").appendingPathExtension("mon")
    guard let data = try? Data(contentsOf: url) else { return }
    let _data = ByteBuffer(data: data)
    readMonster(fb: _data)
  }

  func testCreateMonster() {
    let bytes = createMonster(withPrefix: false)
    XCTAssertEqual(bytes.sizedByteArray, [48, 0, 0, 0, 77, 79, 78, 83, 0, 0, 0, 0, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0])
    readMonster(fb: bytes.buffer)
    mutateMonster(fb: bytes.buffer)
    readMonster(fb: bytes.buffer)
  }

  func testCreateMonsterResizedBuffer() {
    let bytes = createMonster(withPrefix: false)
    XCTAssertEqual(bytes.sizedByteArray, [48, 0, 0, 0, 77, 79, 78, 83, 0, 0, 0, 0, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0])
    readMonster(fb: bytes.sizedBuffer)
  }

  func testCreateMonsterPrefixed() {
    let bytes = createMonster(withPrefix: true)
    XCTAssertEqual(bytes.sizedByteArray, [44, 1, 0, 0, 44, 0, 0, 0, 77, 79, 78, 83, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0])

    let newBuf = FlatBuffersUtils.removeSizePrefix(bb: bytes.buffer)
    readMonster(fb: newBuf)
  }

  func testCreateMonsterUsingCreateMonsterMethodWithNilPos() {
    var fbb = FlatBufferBuilder(initialSize: 1)
    let name = fbb.create(string: "Frodo")
    let mStart = Monster.startMonster(&fbb)
    Monster.add(name: name, &fbb)
    let root = Monster.endMonster(&fbb, start: mStart)
    fbb.finish(offset: root)
    let newMonster = Monster.getRootAsMonster(bb: fbb.sizedBuffer)
    XCTAssertNil(newMonster.pos)
    XCTAssertEqual(newMonster.name, "Frodo")
  }

  func testCreateMonsterUsingCreateMonsterMethodWithPosX() {
    var fbb = FlatBufferBuilder(initialSize: 1)
    let name = fbb.create(string: "Barney")
    let mStart = Monster.startMonster(&fbb)
    Monster.add(pos: MyGame_Example_Vec3(x: 10, y: 0, z: 0, test1: 0, test2: .blue, test3: .init()), &fbb)
    Monster.add(name: name, &fbb)
    let root = Monster.endMonster(&fbb, start: mStart)
    fbb.finish(offset: root)

    let newMonster = Monster.getRootAsMonster(bb: fbb.sizedBuffer)
    XCTAssertEqual(newMonster.pos!.x, 10)
    XCTAssertEqual(newMonster.name, "Barney")
  }

  func testReadMonsterFromUnsafePointerWithoutCopying() {
    var array: [UInt8] = [48, 0, 0, 0, 77, 79, 78, 83, 0, 0, 0, 0, 36, 0, 72, 0, 40, 0, 0, 0, 38, 0, 32, 0, 0, 0, 28, 0, 0, 0, 27, 0, 20, 0, 16, 0, 12, 0, 4, 0, 0, 0, 0, 0, 0, 0, 11, 0, 36, 0, 0, 0, 164, 0, 0, 0, 0, 0, 0, 1, 60, 0, 0, 0, 68, 0, 0, 0, 76, 0, 0, 0, 0, 0, 0, 1, 88, 0, 0, 0, 120, 0, 0, 0, 0, 0, 80, 0, 0, 0, 128, 63, 0, 0, 0, 64, 0, 0, 64, 64, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 64, 2, 0, 5, 0, 6, 0, 0, 0, 2, 0, 0, 0, 64, 0, 0, 0, 48, 0, 0, 0, 2, 0, 0, 0, 30, 0, 40, 0, 10, 0, 20, 0, 152, 255, 255, 255, 4, 0, 0, 0, 4, 0, 0, 0, 70, 114, 101, 100, 0, 0, 0, 0, 5, 0, 0, 0, 0, 1, 2, 3, 4, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 50, 0, 0, 0, 5, 0, 0, 0, 116, 101, 115, 116, 49, 0, 0, 0, 9, 0, 0, 0, 77, 121, 77, 111, 110, 115, 116, 101, 114, 0, 0, 0, 3, 0, 0, 0, 20, 0, 0, 0, 36, 0, 0, 0, 4, 0, 0, 0, 240, 255, 255, 255, 32, 0, 0, 0, 248, 255, 255, 255, 36, 0, 0, 0, 12, 0, 8, 0, 0, 0, 0, 0, 0, 0, 4, 0, 12, 0, 0, 0, 28, 0, 0, 0, 5, 0, 0, 0, 87, 105, 108, 109, 97, 0, 0, 0, 6, 0, 0, 0, 66, 97, 114, 110, 101, 121, 0, 0, 5, 0, 0, 0, 70, 114, 111, 100, 111, 0, 0, 0]
    let unpacked = array.withUnsafeMutableBytes { (memory) -> MyGame_Example_MonsterT in
      let bytes = ByteBuffer(assumingMemoryBound: memory.baseAddress!, capacity: memory.count)
      var monster = Monster.getRootAsMonster(bb: bytes)
      readFlatbufferMonster(monster: &monster)
      let unpacked = monster.unpack()
      return unpacked
    }
    readObjectApi(monster: unpacked)
  }

  func readMonster(fb: ByteBuffer) {
    var monster = Monster.getRootAsMonster(bb: fb)
    readFlatbufferMonster(monster: &monster)
    let unpacked: MyGame_Example_MonsterT? = monster.unpack()
    readObjectApi(monster: unpacked!)
    guard let buffer = unpacked?.serialize() else { fatalError("Couldnt generate bytebuffer") }
    var newMonster = Monster.getRootAsMonster(bb: buffer)
    readFlatbufferMonster(monster: &newMonster)
  }

  func createMonster(withPrefix prefix: Bool) -> FlatBufferBuilder {
    var fbb = FlatBufferBuilder(initialSize: 1)
    let names = [fbb.create(string: "Frodo"), fbb.create(string: "Barney"), fbb.create(string: "Wilma")]
    var offsets: [Offset<UOffset>] = []
    let start1 = Monster.startMonster(&fbb)
    Monster.add(name: names[0], &fbb)
    offsets.append(Monster.endMonster(&fbb, start: start1))
    let start2 = Monster.startMonster(&fbb)
    Monster.add(name: names[1], &fbb)
    offsets.append(Monster.endMonster(&fbb, start: start2))
    let start3 = Monster.startMonster(&fbb)
    Monster.add(name: names[2], &fbb)
    offsets.append(Monster.endMonster(&fbb, start: start3))

    let sortedArray = Monster.sortVectorOfMonster(offsets: offsets, &fbb)

    let str = fbb.create(string: "MyMonster")
    let test1 = fbb.create(string: "test1")
    let test2 = fbb.create(string: "test2")
    let _inv: [Byte] = [0, 1, 2, 3, 4]
    let inv = fbb.createVector(_inv)

    let fred = fbb.create(string: "Fred")
    let mon1Start = Monster.startMonster(&fbb)
    Monster.add(name: fred, &fbb)
    let mon2 = Monster.endMonster(&fbb, start: mon1Start)

    let test4 = fbb.createVector(ofStructs: [
      MyGame_Example_Test(a: 30, b: 40),
      MyGame_Example_Test(a: 10, b: 20),
    ])

    let stringTestVector = fbb.createVector(ofOffsets: [test1, test2])
    let mStart = Monster.startMonster(&fbb)
    Monster.add(pos: MyGame_Example_Vec3(x: 1, y: 2, z: 3, test1: 3, test2: .green, test3: .init(a: 5, b: 6)), &fbb)
    Monster.add(hp: 80, &fbb)
    Monster.add(name: str, &fbb)
    Monster.addVectorOf(inventory: inv, &fbb)
    Monster.add(testType: .monster, &fbb)
    Monster.add(test: mon2, &fbb)
    Monster.addVectorOf(test4: test4, &fbb)
    Monster.addVectorOf(testarrayofstring: stringTestVector, &fbb)
    Monster.add(testbool: true, &fbb)
    Monster.addVectorOf(testarrayoftables: sortedArray, &fbb)
    let end = Monster.endMonster(&fbb, start: mStart)
    Monster.finish(&fbb, end: end, prefix: prefix)
    return fbb
  }

  func mutateMonster(fb: ByteBuffer) {
    let monster = Monster.getRootAsMonster(bb: fb)
    XCTAssertFalse(monster.mutate(mana: 10))
    XCTAssertEqual(monster.testarrayoftables(at: 0)?.name, "Barney")
    XCTAssertEqual(monster.testarrayoftables(at: 1)?.name, "Frodo")
    XCTAssertEqual(monster.testarrayoftables(at: 2)?.name, "Wilma")

    // Example of searching for a table by the key
    XCTAssertNotNil(monster.testarrayoftablesBy(key: "Frodo"))
    XCTAssertNotNil(monster.testarrayoftablesBy(key: "Barney"))
    XCTAssertNotNil(monster.testarrayoftablesBy(key: "Wilma"))

    XCTAssertEqual(monster.testType, .monster)

    XCTAssertEqual(monster.mutate(inventory: 1, at: 0), true)
    XCTAssertEqual(monster.mutate(inventory: 2, at: 1), true)
    XCTAssertEqual(monster.mutate(inventory: 3, at: 2), true)
    XCTAssertEqual(monster.mutate(inventory: 4, at: 3), true)
    XCTAssertEqual(monster.mutate(inventory: 5, at: 4), true)

    for i in 0..<monster.inventoryCount {
      XCTAssertEqual(monster.inventory(at: i), Byte(i + 1))
    }

    XCTAssertEqual(monster.mutate(inventory: 0, at: 0), true)
    XCTAssertEqual(monster.mutate(inventory: 1, at: 1), true)
    XCTAssertEqual(monster.mutate(inventory: 2, at: 2), true)
    XCTAssertEqual(monster.mutate(inventory: 3, at: 3), true)
    XCTAssertEqual(monster.mutate(inventory: 4, at: 4), true)

    let vec = monster.mutablePos
    XCTAssertEqual(vec?.x, 1)
    XCTAssertTrue(vec?.mutate(x: 55.0) ?? false)
    XCTAssertTrue(vec?.mutate(test1: 55) ?? false)
    XCTAssertEqual(vec?.x, 55.0)
    XCTAssertEqual(vec?.test1, 55.0)
    XCTAssertTrue(vec?.mutate(x: 1) ?? false)
    XCTAssertEqual(vec?.x, 1)
    XCTAssertTrue(vec?.mutate(test1: 3) ?? false)
  }

  func readFlatbufferMonster(monster: inout MyGame_Example_Monster) {
    XCTAssertEqual(monster.hp, 80)
    XCTAssertEqual(monster.mana, 150)
    XCTAssertEqual(monster.name, "MyMonster")
    let pos = monster.pos
    XCTAssertEqual(pos?.x, 1)
    XCTAssertEqual(pos?.y, 2)
    XCTAssertEqual(pos?.z, 3)
    XCTAssertEqual(pos?.test1, 3)
    XCTAssertEqual(pos?.test2, .green)
    let test = pos?.test3
    XCTAssertEqual(test?.a, 5)
    XCTAssertEqual(test?.b, 6)
    XCTAssertEqual(monster.testType, .monster)
    let monster2 = monster.test(type: Monster.self)
    XCTAssertEqual(monster2?.name, "Fred")

    XCTAssertEqual(monster.mutate(mana: 10), false)

    XCTAssertEqual(monster.mana, 150)
    XCTAssertEqual(monster.inventoryCount, 5)
    var sum: Byte = 0
    for i in 0...monster.inventoryCount {
      sum += monster.inventory(at: i)
    }
    XCTAssertEqual(sum, 10)
    XCTAssertEqual(monster.test4Count, 2)

    let test0 = monster.test4(at: 0)
    let test1 = monster.test4(at: 1)
    var sum0 = 0
    var sum1 = 0
    if let a = test0?.a, let b = test0?.b {
      sum0 = Int(a) + Int(b)
    }
    if let a = test1?.a, let b = test1?.b {
      sum1 = Int(a) + Int(b)
    }
    XCTAssertEqual(sum0 + sum1, 100)

    let mutableTest0 = monster.mutableTest4(at: 0)
    let mutableTest1 = monster.mutableTest4(at: 1)
    var sum2 = 0
    var sum3 = 0
    if let a = mutableTest0?.a, let b = mutableTest0?.b {
      sum2 = Int(a) + Int(b)
    }
    if let a = mutableTest1?.a, let b = mutableTest1?.b {
      sum3 = Int(a) + Int(b)
    }
    XCTAssertEqual(sum2 + sum3, 100)

    XCTAssertEqual(monster.testarrayofstringCount, 2)
    XCTAssertEqual(monster.testarrayofstring(at: 0), "test1")
    XCTAssertEqual(monster.testarrayofstring(at: 1), "test2")
    XCTAssertEqual(monster.testbool, true)

    let array = monster.nameSegmentArray
    XCTAssertEqual(String(bytes: array ?? [], encoding: .utf8), "MyMonster")

    if 0 == monster.testarrayofboolsCount  {
      XCTAssertEqual(monster.testarrayofbools.isEmpty, true)
    } else {
      XCTAssertEqual(monster.testarrayofbools.isEmpty, false)
    }
  }

  func readObjectApi(monster: MyGame_Example_MonsterT) {
    XCTAssertEqual(monster.hp, 80)
    XCTAssertEqual(monster.mana, 150)
    XCTAssertEqual(monster.name, "MyMonster")
    let pos = monster.pos
    XCTAssertEqual(pos?.x, 1)
    XCTAssertEqual(pos?.y, 2)
    XCTAssertEqual(pos?.z, 3)
    XCTAssertEqual(pos?.test1, 3)
    XCTAssertEqual(pos?.test2, .green)
    let test = pos?.test3
    XCTAssertEqual(test?.a, 5)
    XCTAssertEqual(test?.b, 6)
    let monster2 = monster.test?.value as? MyGame_Example_MonsterT
    XCTAssertEqual(monster2?.name, "Fred")
    XCTAssertEqual(monster.mana, 150)
    monster.mana = 10
    XCTAssertEqual(monster.mana, 10)
    monster.mana = 150
    XCTAssertEqual(monster.mana, 150)

    XCTAssertEqual(monster.inventory.count, 5)
    var sum: Byte = 0
    for i in monster.inventory {
      sum += i
    }
    XCTAssertEqual(sum, 10)
    XCTAssertEqual(monster.test4.count, 2)
    let test0 = monster.test4[0]
    let test1 = monster.test4[1]
    var sum0 = 0
    var sum1 = 0
    if let a = test0?.a, let b = test0?.b {
      sum0 = Int(a) + Int(b)
    }
    if let a = test1?.a, let b = test1?.b {
      sum1 = Int(a) + Int(b)
    }
    XCTAssertEqual(sum0 + sum1, 100)
    XCTAssertEqual(monster.testbool, true)
  }
}