using System;
using System.Linq;
using AcDream.App.UI.Layout;
using AcDream.Core.Items;
using AcDream.Core.Player;
using Xunit;

namespace AcDream.App.Tests.UI.Layout;

/// <summary>
/// Tests for <see cref="CharacterSheetProvider"/> — the extracted character-sheet
/// assembly + raise flow (formerly private methods inside GameWindow). Covers the
/// XP-curve math against a known synthetic ExperienceTable and the single-owner
/// spend routing (table debits fire ObjectUpdated; LocalPlayerState debits fire
/// CharacterChanged).
/// </summary>
public sealed class CharacterSheetProviderTests
{
    private const uint PlayerGuid = 0x50000001u;

    /// <summary>Synthetic cumulative-XP curves. Levels band 1→2 spans 100..250.</summary>
    private static DatReaderWriter.DBObjs.ExperienceTable MakeXpTable() => new()
    {
        Levels = new ulong[] { 0, 100, 250, 450 },
        Attributes = new uint[] { 0, 10, 30, 60, 100 },
        Vitals = new uint[] { 0, 4, 12, 24 },
        TrainedSkills = new uint[] { 0, 5, 15, 30 },
        SpecializedSkills = new uint[] { 0, 8, 24, 48 },
    };

    private sealed class Harness
    {
        public ClientObjectTable Table { get; } = new();
        public LocalPlayerState Player { get; } = new();
        public CharacterSheetProvider Provider { get; }
        public (uint statId, ulong cost)? SentAttribute;
        public (uint skillId, uint credits)? SentTrain;
        public bool CanSend = true;

        public Harness()
        {
            Provider = new CharacterSheetProvider(
                Table, Player,
                playerGuid: () => PlayerGuid,
                activeToonName: () => "default",
                fallbackSheet: name => new CharacterSheet { Name = name, Level = -1 },
                canSendRaise: () => CanSend,
                sendRaiseAttribute: (statId, cost) => SentAttribute = (statId, cost),
                sendRaiseVital: (_, _) => { },
                sendRaiseSkill: (_, _) => { },
                sendTrainSkill: (skillId, credits) => SentTrain = (skillId, credits))
            {
                ExperienceTable = MakeXpTable(),
            };
        }

        /// <summary>Put the player's ClientObject in the table with live sheet properties.</summary>
        public ClientObject AddPlayerObject(long unassignedXp = 1000L)
        {
            var player = new ClientObject { ObjectId = PlayerGuid, Name = "Testy" };
            player.Properties.Ints[0x19u] = 1;        // level
            player.Properties.Int64s[1u] = 150L;      // total XP — mid 100..250 band
            player.Properties.Int64s[2u] = unassignedXp;
            Table.AddOrUpdate(player);
            return player;
        }
    }

    [Fact]
    public void BuildSheet_NoLiveData_UsesFallbackSheet()
    {
        var h = new Harness();

        var sheet = h.Provider.BuildSheet();

        Assert.Equal(-1, sheet.Level);          // fallback marker
        Assert.Equal("Player", sheet.Name);     // toon key "default" + no object → "Player"
    }

    [Fact]
    public void BuildSheet_LiveData_ComputesLevelBandAndRaiseCosts()
    {
        var h = new Harness();
        h.AddPlayerObject(unassignedXp: 777L);
        h.Player.OnAttributeUpdate(atType: 1u, ranks: 1u, start: 10u, xp: 10u); // Strength

        var sheet = h.Provider.BuildSheet();

        Assert.Equal("Testy", sheet.Name);      // live object name beats "Player"
        Assert.Equal(1, sheet.Level);
        Assert.Equal(150L, sheet.TotalXp);
        Assert.Equal(777L, sheet.UnassignedXp);
        // Level band 100..250, at 150: 100 XP to next, 1/3 through the band.
        Assert.Equal(100L, sheet.XpToNextLevel);
        Assert.Equal(1f / 3f, sheet.XpFraction, precision: 4);
        Assert.Equal(11, sheet.Strength);       // ranks + start
        // Raise x1: Attributes[2] − xpSpent = 30 − 10; x10 clamps at curve end: 100 − 10.
        Assert.Equal(20L, sheet.AttributeRaiseCosts[0]);
        Assert.Equal(90L, sheet.AttributeRaise10Costs[0]);
    }

    [Fact]
    public void BuildSheet_Skills_MapsAdvancementAndCurveCosts()
    {
        var h = new Harness();
        h.AddPlayerObject();
        h.Player.OnSkillUpdate(skillId: 6u, ranks: 1u, status: 2u, xp: 5u,
            init: 0u, resistance: 0u, lastUsed: 0, formulaBonus: 0u);   // trained
        h.Player.OnSkillUpdate(skillId: 7u, ranks: 0u, status: 0u, xp: 0u,
            init: 0u, resistance: 0u, lastUsed: 0, formulaBonus: 0u);   // inactive → excluded

        var sheet = h.Provider.BuildSheet();

        var skill = Assert.Single(sheet.Skills);
        Assert.Equal(6u, skill.Id);
        Assert.Equal("Skill 6", skill.Name);    // no SkillTable → id fallback name
        Assert.Equal(CharacterSkillAdvancementClass.Trained, skill.AdvancementClass);
        // TrainedSkills curve: x1 = 15 − 5; x10 clamps at index 3: 30 − 5.
        Assert.Equal(10L, skill.RaiseCost);
        Assert.Equal(25L, skill.Raise10Cost);
    }

    [Fact]
    public void HandleRaiseRequest_Attribute_SendsAndDebitsThroughTableEvents()
    {
        var h = new Harness();
        h.AddPlayerObject(unassignedXp: 1000L);
        h.Player.OnAttributeUpdate(atType: 1u, ranks: 1u, start: 10u, xp: 10u);
        int tableUpdates = 0;
        h.Table.ObjectUpdated += _ => tableUpdates++;

        h.Provider.HandleRaiseRequest(new CharacterStatController.RaiseRequest(
            CharacterStatController.RaiseTargetKind.Attribute, StatId: 1u, Cost: 20L, Amount: 1));

        Assert.Equal((1u, 20ul), h.SentAttribute);
        var strength = h.Player.GetAttribute(LocalPlayerState.AttributeKind.Strength);
        Assert.Equal(2u, strength!.Value.Ranks);                       // optimistic rank apply
        Assert.Equal(980L, h.Table.Get(PlayerGuid)!.Properties.GetInt64(2u)); // XP debited
        Assert.True(tableUpdates >= 1);                                // via the eventful API
    }

    [Fact]
    public void HandleRaiseRequest_Blocked_WhenCanSendIsFalse()
    {
        var h = new Harness();
        h.AddPlayerObject(unassignedXp: 1000L);
        h.Player.OnAttributeUpdate(atType: 1u, ranks: 1u, start: 10u, xp: 10u);
        h.CanSend = false;

        h.Provider.HandleRaiseRequest(new CharacterStatController.RaiseRequest(
            CharacterStatController.RaiseTargetKind.Attribute, StatId: 1u, Cost: 20L, Amount: 1));

        Assert.Null(h.SentAttribute);
        Assert.Equal(1u, h.Player.GetAttribute(LocalPlayerState.AttributeKind.Strength)!.Value.Ranks);
        Assert.Equal(1000L, h.Table.Get(PlayerGuid)!.Properties.GetInt64(2u));
    }

    [Fact]
    public void HandleRaiseRequest_TrainSkill_DebitsFirstPresentCreditProperty()
    {
        var h = new Harness();
        var player = h.AddPlayerObject();
        player.Properties.Ints[0xC0u] = 4;   // only the second id in the 0x18→0xC0→0xB5 chain
        h.Player.OnSkillUpdate(skillId: 6u, ranks: 0u, status: 1u, xp: 0u,
            init: 0u, resistance: 0u, lastUsed: 0, formulaBonus: 0u);   // untrained

        h.Provider.HandleRaiseRequest(new CharacterStatController.RaiseRequest(
            CharacterStatController.RaiseTargetKind.TrainSkill, StatId: 6u, Cost: 4L, Amount: 1));

        Assert.Equal((6u, 4u), h.SentTrain);
        Assert.Equal(2u, h.Player.GetSkill(6u)!.Value.Status);          // promoted to trained
        Assert.Equal(0, player.Properties.GetInt(0xC0u));               // credits debited
    }

    [Fact]
    public void SpendUnassignedXp_FallsBackToLocalPlayer_WhenPlayerObjectAbsent()
    {
        var h = new Harness();   // note: nothing added to the table
        var props = new PropertyBundle();
        props.Int64s[2u] = 500L;
        h.Player.OnProperties(props);
        h.Player.OnAttributeUpdate(atType: 1u, ranks: 1u, start: 10u, xp: 10u);
        int changed = 0;
        h.Player.CharacterChanged += () => changed++;

        h.Provider.HandleRaiseRequest(new CharacterStatController.RaiseRequest(
            CharacterStatController.RaiseTargetKind.Attribute, StatId: 1u, Cost: 100L, Amount: 1));

        Assert.Equal(400L, h.Player.Properties.GetInt64(2u));   // debited on the LPS side
        Assert.True(changed >= 1);                              // and CharacterChanged fired
    }
}