import Foundation

import UIKit
import XCTest

import Postbox
@testable import Postbox

private let peerId = PeerId(namespace: 1, id: 1)
private let namespace: Int32 = 1
private let authorPeerId = PeerId(namespace: 1, id: 6)
private let peer = TestPeer(id: 6, data: "abc")

private func ==(lhs: [Media], rhs: [Media]) -> Bool {
    if lhs.count != rhs.count {
        return false
    }
    
    for i in 0 ..< lhs.count {
        if !lhs[i].isEqual(rhs[i]) {
            return false
        }
    }
    return true
}

private enum Entry: Equatable, CustomStringConvertible {
    case Message(Int32, Int32, String, [Media])
    case Hole(Int32, Int32, Int32)
    
    var description: String {
        switch self {
            case let .Message(id, timestamp, text, media):
                return "Message(\(id), \(timestamp), \(text), \(media))"
            case let .Hole(min, max, timestamp):
                return "Hole(\(min), \(max), \(timestamp))"
        }
    }
}

private func ==(lhs: Entry, rhs: Entry) -> Bool {
    switch lhs {
        case let .Message(lhsId, lhsTimestamp, lhsText, lhsMedia):
            switch rhs {
                case let .Message(rhsId, rhsTimestamp, rhsText, rhsMedia):
                    return lhsId == rhsId && lhsTimestamp == rhsTimestamp && lhsText == rhsText && lhsMedia == rhsMedia
                case .Hole:
                    return false
            }
        case let .Hole(lhsMin, lhsMax, lhsMaxTimestamp):
            switch rhs {
                case .Message:
                    return false
                case let .Hole(rhsMin, rhsMax, rhsMaxTimestamp):
                    return lhsMin == rhsMin && lhsMax == rhsMax && lhsMaxTimestamp == rhsMaxTimestamp
            }
    }
}

private class TestEmbeddedMedia: Media, CustomStringConvertible {
    var id: MediaId? { return nil }
    var peerIds: [PeerId] = []
    let data: String
    
    init(data: String) {
        self.data = data
    }
    
    required init(decoder: Decoder) {
        self.data = decoder.decodeStringForKey("s")
    }
    
    func encode(encoder: Encoder) {
        encoder.encodeString(self.data, forKey: "s")
    }
    
    func isEqual(other: Media) -> Bool {
        if let other = other as? TestEmbeddedMedia {
            return self.data == other.data
        }
        return false
    }
    
    var description: String {
        return "TestEmbeddedMedia(\(self.data))"
    }
}

private class TestExternalMedia: Media {
    let id: MediaId?
    var peerIds: [PeerId] = []
    let data: String
    
    init(id: Int64, data: String) {
        self.id = MediaId(namespace: namespace, id: id)
        self.data = data
    }
    
    required init(decoder: Decoder) {
        self.id = MediaId(namespace: decoder.decodeInt32ForKey("i.n"), id: decoder.decodeInt64ForKey("i.i"))
        self.data = decoder.decodeStringForKey("s")
    }
    
    func encode(encoder: Encoder) {
        encoder.encodeInt32(self.id!.namespace, forKey: "i.n")
        encoder.encodeInt64(self.id!.id, forKey: "i.i")
        encoder.encodeString(self.data, forKey: "s")
    }
    
    func isEqual(other: Media) -> Bool {
        if let other = other as? TestExternalMedia {
            return self.id == other.id && self.data == other.data
        }
        return false
    }
    
    var description: String {
        return "TestExternalMedia(\(self.id!.id), \(self.data))"
    }
}

private class TestPeer: Peer {
    let id: PeerId
    let data: String
    
    init(id: Int32, data: String) {
        self.id = PeerId(namespace: namespace, id: id)
        self.data = data
    }
    
    required init(decoder: Decoder) {
        self.id = PeerId(namespace: decoder.decodeInt32ForKey("i.n"), id: decoder.decodeInt32ForKey("i.i"))
        self.data = decoder.decodeStringForKey("s")
    }
    
    func encode(encoder: Encoder) {
        encoder.encodeInt32(self.id.namespace, forKey: "i.n")
        encoder.encodeInt32(self.id.id, forKey: "i.i")
        encoder.encodeString(self.data, forKey: "s")
    }
    
    func isEqual(other: Peer) -> Bool {
        if let other = other as? TestPeer {
            return self.id == other.id && self.data == other.data
        }
        return false
    }
    
    var description: String {
        return "TestPeer(\(self.id.id), \(self.data))"
    }
}

private enum MediaEntry: Equatable {
    case Direct(Media, Int)
    case MessageReference(Int32)
    
    init(_ entry: DebugMediaEntry) {
        switch entry {
            case let .Direct(media, referenceCount):
                self = .Direct(media, referenceCount)
            case let .MessageReference(index):
                self = MessageReference(index.id.id)
        }
    }
}

private func ==(lhs: MediaEntry, rhs: MediaEntry) -> Bool {
    switch lhs {
        case let .Direct(lhsMedia, lhsReferenceCount):
            switch rhs {
                case let .Direct(rhsMedia, rhsReferenceCount):
                    return lhsMedia.isEqual(rhsMedia) && lhsReferenceCount == rhsReferenceCount
                case .MessageReference:
                    return false
            }
        case let .MessageReference(lhsId):
            switch rhs {
                case .Direct:
                    return false
                case let .MessageReference(rhsId):
                    return lhsId == rhsId
            }
    }
}

class MessageHistoryTableTests: XCTestCase {
    var valueBox: ValueBox?
    var path: String?
    
    var peerTable: PeerTable?
    var globalMessageIdsTable: GlobalMessageIdsTable?
    var indexTable: MessageHistoryIndexTable?
    var mediaTable: MessageMediaTable?
    var mediaCleanupTable: MediaCleanupTable?
    var historyTable: MessageHistoryTable?
    
    override class func setUp() {
        super.setUp()
        
        declareEncodable(TestEmbeddedMedia.self, f: {TestEmbeddedMedia(decoder: $0)})
        declareEncodable(TestExternalMedia.self, f: {TestExternalMedia(decoder: $0)})
        declareEncodable(TestPeer.self, f: {TestPeer(decoder: $0)})
    }
    
    override func setUp() {
        super.setUp()
        
        var randomId: Int64 = 0
        arc4random_buf(&randomId, 8)
        path = NSTemporaryDirectory().stringByAppendingString("\(randomId)")
        self.valueBox = SqliteValueBox(basePath: path!)
        
        self.globalMessageIdsTable = GlobalMessageIdsTable(valueBox: self.valueBox!, tableId: 5, namespace: namespace)
        self.indexTable = MessageHistoryIndexTable(valueBox: self.valueBox!, tableId: 1, globalMessageIdsTable: self.globalMessageIdsTable!)
        self.mediaCleanupTable = MediaCleanupTable(valueBox: self.valueBox!, tableId: 3)
        self.mediaTable = MessageMediaTable(valueBox: self.valueBox!, tableId: 2, mediaCleanupTable: self.mediaCleanupTable!)
        self.historyTable = MessageHistoryTable(valueBox: self.valueBox!, tableId: 4, messageHistoryIndexTable: self.indexTable!, messageMediaTable: self.mediaTable!)
        self.peerTable = PeerTable(valueBox: self.valueBox!, tableId: 6)
        self.peerTable!.set(peer)
    }
    
    override func tearDown() {
        super.tearDown()
        
        self.historyTable = nil
        self.indexTable = nil
        self.mediaTable = nil
        self.mediaCleanupTable = nil
        self.peerTable = nil
        
        self.valueBox = nil
        let _ = try? NSFileManager.defaultManager().removeItemAtPath(path!)
        self.path = nil
    }
    
    private func addMessage(id: Int32, _ timestamp: Int32, _ text: String = "", _ media: [Media] = []) {
        var operationsByPeerId: [PeerId: [MessageHistoryOperation]] = [:]
        self.historyTable!.addMessages([StoreMessage(id: MessageId(peerId: peerId, namespace: namespace, id: id), timestamp: timestamp, authorId: authorPeerId, text: text, attributes: [], media: media)], location: .Random, operationsByPeerId: &operationsByPeerId)
        //print("\(operationsByPeerId[peerId]!)")
    }
    
    private func addHole(id: Int32) {
        var operationsByPeerId: [PeerId: [MessageHistoryOperation]] = [:]
        self.historyTable!.addHoles([MessageId(peerId: peerId, namespace: namespace, id: id)], operationsByPeerId: &operationsByPeerId)
    }
    
    private func removeMessages(ids: [Int32]) {
        var operationsByPeerId: [PeerId: [MessageHistoryOperation]] = [:]
        self.historyTable!.removeMessages(ids.map({ MessageId(peerId: peerId, namespace: namespace, id: $0) }), operationsByPeerId: &operationsByPeerId)
        //print("\(operationsByPeerId[peerId]!)")
    }
    
    private func fillHole(id: Int32, _ fillType: HoleFillType, _ messages: [(Int32, Int32, String, [Media])]) {
        var operationsByPeerId: [PeerId: [MessageHistoryOperation]] = [:]
        self.historyTable!.fillHole(MessageId(peerId: peerId, namespace: namespace, id: id), fillType: fillType, messages: messages.map({ StoreMessage(id: MessageId(peerId: peerId, namespace: namespace, id: $0.0), timestamp: $0.1, authorId: authorPeerId, text: $0.2, attributes: [], media: $0.3) }), operationsByPeerId: &operationsByPeerId)
    }
    
    private func expectEntries(entries: [Entry]) {
        let actualEntries = self.historyTable!.debugList(peerId, peerTable: self.peerTable!).map({ entry -> Entry in
            switch entry {
                case let .RenderedMessage(message):
                    if let messagePeer = message.author {
                        if !peer.isEqual(messagePeer) {
                            XCTFail("Expected peer \(peer), actual: \(messagePeer)")
                        }
                    } else {
                        XCTFail("Expected peer \(peer), actual: nil")
                    }
                    return .Message(message.id.id, message.timestamp, message.text, message.media)
                case let .Hole(hole):
                    return .Hole(hole.min, hole.maxIndex.id.id, hole.maxIndex.timestamp)
            }
        })
        if actualEntries != entries {
            XCTFail("Expected\n\(entries)\nActual\n\(actualEntries)")
        }
    }
    
    private func expectMedia(media: [MediaEntry]) {
        let actualMedia = self.mediaTable!.debugList().map({MediaEntry($0)})
        if media != actualMedia {
            XCTFail("Expected\n\(media)\nActual\n\(actualMedia)")
        }
    }
    
    private func expectCleanupMedia(media: [Media]) {
        let actualMedia = self.mediaCleanupTable!.debugList()
        var equal = true
        if media.count != actualMedia.count {
            equal = false
        } else {
            for i in 0 ..< media.count {
                if !media[i].isEqual(actualMedia[i]) {
                    equal = false
                    break
                }
            }
        }
        
        if !equal {
            XCTFail("Expected\n\(media)\nActual\n\(actualMedia)")
        }
    }
    
    func testInsertMessageIntoEmpty() {
        addMessage(100, 100, "t100")
        addMessage(200, 200, "t200")
        
        expectEntries([.Message(100, 100, "t100", []), .Message(200, 200, "t200", [])])
    }
    
    func testInsertMessageIgnoreOverwrite() {
        addMessage(100, 100, "t100")
        addMessage(100, 200, "t200")
        
        expectEntries([.Message(100, 100, "t100", [])])
    }
    
    func testInsertMessageWithEmbeddedMedia() {
        addMessage(100, 100, "t100", [TestEmbeddedMedia(data: "abc1")])
        
        expectEntries([.Message(100, 100, "t100", [TestEmbeddedMedia(data: "abc1")])])
        expectMedia([])
    }
    
    func testInsertMessageWithExternalMedia() {
        let media = TestExternalMedia(id: 10, data: "abc1")
        addMessage(100, 100, "t100", [media])
        
        expectEntries([.Message(100, 100, "t100", [media])])
        expectMedia([.MessageReference(100)])
    }
    
    func testUnembedExternalMedia() {
        let media = TestExternalMedia(id: 10, data: "abc1")
        addMessage(100, 100, "t100", [media])
        addMessage(200, 200, "t200", [media])
        
        expectEntries([.Message(100, 100, "t100", [media]), .Message(200, 200, "t200", [media])])
        expectMedia([.Direct(media, 2)])
    }
    
    func testIgnoreOverrideExternalMedia() {
        let media = TestExternalMedia(id: 10, data: "abc1")
        let media1 = TestExternalMedia(id: 10, data: "abc2")
        addMessage(100, 100, "t100", [media])
        addMessage(200, 200, "t200", [media1])
        
        expectEntries([.Message(100, 100, "t100", [media]), .Message(200, 200, "t200", [media])])
        expectMedia([.Direct(media, 2)])
    }
    
    func testRemoveSingleMessage() {
        addMessage(100, 100, "t100", [])
        
        removeMessages([100])
        
        expectEntries([])
        expectMedia([])
    }
    
    func testRemoveMessageWithEmbeddedMedia() {
        let media = TestEmbeddedMedia(data: "abc1")
        addMessage(100, 100, "t100", [media])
        self.removeMessages([100])
        
        expectEntries([])
        expectMedia([])
        expectCleanupMedia([media])
    }
    
    func testRemoveOnlyReferenceToExternalMedia() {
        let media = TestExternalMedia(id: 10, data: "abc1")
        addMessage(100, 100, "t100", [media])
        removeMessages([100])
        
        expectEntries([])
        expectMedia([])
        expectCleanupMedia([media])
    }
    
    func testRemoveReferenceToExternalMedia() {
        let media = TestExternalMedia(id: 10, data: "abc1")
        addMessage(100, 100, "t100", [media])
        addMessage(200, 200, "t200", [media])
        removeMessages([100])
        
        expectEntries([.Message(200, 200, "t200", [media])])
        expectMedia([.Direct(media, 1)])
        expectCleanupMedia([])
        
        removeMessages([200])
        
        expectEntries([])
        expectMedia([])
        expectCleanupMedia([media])
    }
    
    func testAddHoleToEmpty() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testAddHoleToFullHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        addHole(110)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testAddMessageToFullHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        addMessage(90, 90, "m90")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
    }
    
    func testAddMessageDividingUpperHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        addMessage(90, 90, "m90")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
        addMessage(100, 100, "m100")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, 99, 100), .Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
    }
    
    func testAddMessageDividingLowerHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        addMessage(90, 90, "m90")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
        addMessage(80, 80, "m80")
        expectEntries([.Hole(1, 79, 80), .Message(80, 80, "m80", []), .Hole(81, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
    }
    
    func testAddMessageOffsettingUpperHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        
        addMessage(90, 90, "m90")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
        addMessage(91, 91, "m91")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Message(91, 91, "m91", []), .Hole(92, Int32.max, Int32.max)])
    }
    
    func testAddMessageOffsettingLowerHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        
        addMessage(90, 90, "m90")
        expectEntries([.Hole(1, 89, 90), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
        addMessage(89, 89, "m89")
        expectEntries([.Hole(1, 88, 89), .Message(89, 89, "m89", []), .Message(90, 90, "m90", []), .Hole(91, Int32.max, Int32.max)])
    }
    
    func testAddMessageOffsettingLeftmostHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        
        addMessage(1, 1, "m1")
        
        expectEntries([.Message(1, 1, "m1", []), .Hole(2, Int32.max, Int32.max)])
    }
    
    func testAddMessageRemovingLefmostHole() {
        addHole(100)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        
        addMessage(2, 2, "m2")
        expectEntries([.Hole(1, 1, 2), .Message(2, 2, "m2", []), .Hole(3, Int32.max, Int32.max)])
        
        addMessage(1, 1, "m1")
        expectEntries([.Message(1, 1, "m1", []), .Message(2, 2, "m2", []), .Hole(3, Int32.max, Int32.max)])
    }
    
    func testAddHoleLowerThanMessage() {
        addMessage(100, 100, "m100")
        addHole(1)
        
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", [])])
    }
    
    func testAddHoleHigherThanMessage() {
        addMessage(100, 100, "m100")
        addHole(200)
        
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
    }
    
    func testIgnoreHigherHole() {
        addHole(200)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
        addHole(400)
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testIgnoreHigherHoleAfterMessage() {
        addMessage(100, 100, "m100")
        addHole(200)
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
        addHole(400)
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
    }
    
    func testAddHoleBetweenMessages() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        addHole(150)
        
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, 199, 200), .Message(200, 200, "m200", [])])
    }
    
    func testFillHoleEmpty() {
        fillHole(1, .Complete, [])
        expectEntries([])
    }
    
    func testFillHoleComplete() {
        addHole(100)
        
        fillHole(1, .Complete, [(100, 100, "m100", []), (200, 200, "m200", [])])
        expectEntries([.Message(100, 100, "m100", []), .Message(200, 200, "m200", [])])
    }
    
    func testFillHoleUpperToLowerPartial() {
        addHole(100)
        
        fillHole(1, .UpperToLower, [(100, 100, "m100", []), (200, 200, "m200", [])])
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", []), .Message(200, 200, "m200", [])])
    }
    
    func testFillHoleUpperToLowerToBounds() {
        addHole(100)
        
        fillHole(1, .UpperToLower, [(1, 1, "m1", []), (200, 200, "m200", [])])
        expectEntries([.Message(1, 1, "m1", []), .Message(200, 200, "m200", [])])
    }
    
    func testFillHoleLowerToUpperToBounds() {
        addHole(100)
        
        fillHole(1, .LowerToUpper, [(100, 100, "m100", []), (Int32.max, 200, "m200", [])])
        expectEntries([.Message(100, 100, "m100", []), .Message(Int32.max, 200, "m200", [])])
    }
    
    func testFillHoleLowerToUpperPartial() {
        addHole(100)
        
        fillHole(1, .LowerToUpper, [(100, 100, "m100", []), (200, 200, "m200", [])])
        expectEntries([.Message(100, 100, "m100", []), .Message(200, 200, "m200", []), .Hole(201, Int32.max, Int32.max)])
    }
    
    func testFillHoleBetweenMessagesUpperToLower() {
        addHole(1)
        
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        
        fillHole(199, .UpperToLower, [(150, 150, "m150", [])])
        
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", []), .Hole(101, 149, 150), .Message(150, 150, "m150", []), .Message(200, 200, "m200", []), .Hole(201, Int32.max, Int32.max)])
    }
    
    func testFillHoleBetweenMessagesLowerToUpper() {
        addHole(1)
        
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        
        fillHole(199, .LowerToUpper, [(150, 150, "m150", [])])
        
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", []), .Message(150, 150, "m150", []), .Hole(151, 199, 200), .Message(200, 200, "m200", []), .Hole(201, Int32.max, Int32.max)])
    }
    
    func testFillHoleBetweenMessagesComplete() {
        addHole(1)
        
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        
        fillHole(199, .Complete, [(150, 150, "m150", [])])
        
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", []), .Message(150, 150, "m150", []), .Message(200, 200, "m200", []), .Hole(201, Int32.max, Int32.max)])
    }
    
    func testFillHoleBetweenMessagesWithMessage() {
        addMessage(200, 200, "m200")
        addMessage(202, 202, "m202")
        addHole(201)
        addMessage(201, 201, "m201")
        
        expectEntries([.Message(200, 200, "m200", []), .Message(201, 201, "m201", []), .Message(202, 202, "m202", [])])
    }
    
    func testFillHoleWithNoMessagesComplete() {
        addMessage(100, 100, "m100")
        addHole(1)
        
        fillHole(99, .Complete, [])
        
        expectEntries([.Message(100, 100, "m100", [])])
    }
    
    func testFillHoleIgnoreOverMessage() {
        addMessage(100, 100, "m100")
        addMessage(101, 101, "m101")
        
        fillHole(100, .Complete, [(90, 90, "m90", [])])
        
        expectEntries([.Message(90, 90, "m90", []), .Message(100, 100, "m100", []), .Message(101, 101, "m101", [])])
    }
    
    func testFillHoleWithOverflow() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        addHole(150)
        
        fillHole(199, .UpperToLower, [(150, 150, "m150", []), (300, 300, "m300", [])])
        
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, 149, 150), .Message(150, 150, "m150", []), .Message(200, 200, "m200", []), .Message(300, 300, "m300", [])])
    }
    
    func testIgnoreHoleOverMessageBetweenMessages() {
        addMessage(199, 199, "m199")
        addMessage(200, 200, "m200")
        addHole(200)
        
        expectEntries([.Message(199, 199, "m199", []), .Message(200, 200, "m200", [])])
    }
    
    func testMergeHoleAfterDeletingMessage() {
        addMessage(100, 100, "m100")
        addHole(1)
        addHole(200)
        
        expectEntries([.Hole(1, 99, 100), .Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
        
        removeMessages([100])
        
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testMergeHoleLowerAfterDeletingMessage() {
        addMessage(100, 100, "m100")
        addHole(1)
        addMessage(200, 200, "m200")
        
        removeMessages([100])
        
        expectEntries([.Hole(1, 199, 200), .Message(200, 200, "m200", [])])
    }
    
    func testMergeHoleUpperAfterDeletingMessage() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        addHole(300)
        
        removeMessages([200])
        
        expectEntries([.Message(100, 100, "m100", []), .Hole(101, Int32.max, Int32.max)])
    }
    
    func testExtendLowerHoleAfterDeletingMessage() {
        addMessage(100, 100, "m100")
        addHole(100)
        
        removeMessages([100])
        
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testExtendUpperHoleAfterDeletingMessage() {
        addMessage(100, 100, "m100")
        addHole(101)
        
        removeMessages([100])
        
        expectEntries([.Hole(1, Int32.max, Int32.max)])
    }
    
    func testDeleteMessageBelowMessage() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        removeMessages([100])
        
        expectEntries([.Message(200, 200, "m200", [])])
    }
    
    func testDeleteMessageAboveMessage() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        removeMessages([200])
        
        expectEntries([.Message(100, 100, "m100", [])])
    }
    
    func testDeleteMessageBetweenMessages() {
        addMessage(100, 100, "m100")
        addMessage(200, 200, "m200")
        addMessage(300, 300, "m300")
        removeMessages([200])
        
        expectEntries([.Message(100, 100, "m100", []), .Message(300, 300, "m300", [])])
    }
}