using AcDream.Content.CharGen;
using AcDream.Core.CharGen;
using DatReaderWriter;
using DatReaderWriter.Options;

namespace AcDream.Content.Tests.CharGen;

/// <summary>
/// Installed-DAT gate for <see cref="ChargenTableReader"/>: proves the real
/// CharGen table (portal.dat 0x0E000002) loads through the SAME
/// <see cref="DatCollectionAdapter"/> production uses and lands in a
/// plausible shape. Env-gated like the rest of Content.Tests' installed-DAT
/// suite (<see cref="ContentConformanceDats.ResolveDatDir"/>) — skips
/// cleanly (with a console note) when no DAT directory is configured,
/// matching e.g. <c>PakEquivalenceTests</c> / <c>RetailDatLoaderTests</c>.
/// </summary>
public sealed class ChargenTableReaderInstalledDatTests
{
    // ACE ACE.Entity.Enum.HeritageGroup — the four heritages CC1's spec
    // calls out by name.
    private const uint AluvianId = 1u;
    private const uint GharundimId = 2u;
    private const uint ShoId = 3u;
    private const uint ViamontianId = 4u;
    private const uint OlthoiId = 12u;
    private const uint OlthoiAcidId = 13u;

    [Fact]
    public void InstalledCharGenTable_LoadsAndHasThirteenHeritageGroups()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);

        ChargenOptions options = ChargenTableReader.Load(adapter);

        // ACE's loader comment: "11 standard player races and 2 Olthoi".
        Assert.Equal(13, options.HeritagesById.Count);
        Assert.NotEmpty(options.StarterAreas);
    }

    [Fact]
    public void InstalledCharGenTable_HasTheFourNamedHeritagesWithRetailDisplayNames()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.True(options.TryGetHeritage(AluvianId, out ChargenHeritageOptions? aluvian));
        Assert.Equal("Aluvian", aluvian!.Name);

        Assert.True(options.TryGetHeritage(GharundimId, out ChargenHeritageOptions? gharundim));
        Assert.Equal("Gharu'ndim", gharundim!.Name);

        Assert.True(options.TryGetHeritage(ShoId, out ChargenHeritageOptions? sho));
        Assert.Equal("Sho", sho!.Name);

        Assert.True(options.TryGetHeritage(ViamontianId, out ChargenHeritageOptions? viamontian));
        Assert.Equal("Viamontian", viamontian!.Name);

        Assert.True(options.TryGetHeritage(OlthoiId, out ChargenHeritageOptions? olthoi));
        Assert.True(olthoi!.IsOlthoi);
        Assert.True(options.TryGetHeritage(OlthoiAcidId, out ChargenHeritageOptions? olthoiAcid));
        Assert.True(olthoiAcid!.IsOlthoi);
    }

    [Fact]
    public void InstalledHeritages_EachHasAtLeastOneGenderWithNonEmptyAppearanceOptions()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.NotEmpty(options.HeritagesById);
        foreach (ChargenHeritageOptions heritage in options.HeritagesById.Values)
        {
            Assert.NotEmpty(heritage.GendersByKey);
            Assert.Contains(
                heritage.GendersByKey.Values,
                gender => gender.HasAnyAppearanceOptions);
        }
    }

    /// <summary>
    /// Every template's six attributes fall within retail's 10..100 range,
    /// and no template's total exceeds its heritage's AttributeCredits
    /// budget. NOT every template fully spends the budget — each of the
    /// four human heritages (and Olthoi Acid) ships an "Adventurer" template
    /// sitting at the floor (60 of a 330 budget; confirmed against the
    /// installed DAT), which is retail's "Custom" starting point delivered
    /// as a real TemplateCG entry rather than a special-cased UI-only
    /// option. Every OTHER named human template (Bow Hunter, Swashbuckler,
    /// Life Caster, War Mage, Wayfarer, Soldier) exactly exhausts its
    /// heritage's credits, and Olthoi's single "Ripper" template exactly
    /// exhausts its (much smaller, non-customizable) 60-credit budget — so
    /// SOME template somewhere fully spends its budget, even though no
    /// single heritage is guaranteed to (Olthoi Acid's only template is the
    /// unspent "Adventurer" one).
    /// </summary>
    [Fact]
    public void InstalledHeritages_EveryTemplateAttributeSpreadFitsTheAttributeBudget()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        int templatesChecked = 0;
        bool anyFullySpentAnywhere = false;
        foreach (ChargenHeritageOptions heritage in options.HeritagesById.Values)
        {
            foreach (ChargenTemplate template in heritage.Templates)
            {
                templatesChecked++;
                Assert.True(
                    ChargenAttributeMath.AreAllWithinRange(template.Attributes),
                    $"{heritage.Name}/{template.Name}: an attribute fell outside " +
                    $"{ChargenAttributeMath.AttributeMin}..{ChargenAttributeMath.AttributeMax} " +
                    $"({template.Attributes}).");
                Assert.True(
                    template.Attributes.Total <= heritage.AttributeCredits,
                    $"{heritage.Name}/{template.Name}: attribute spread totals " +
                    $"{template.Attributes.Total}, exceeding the {heritage.AttributeCredits}-credit budget.");
                anyFullySpentAnywhere |= ChargenAttributeMath.IsFullySpent(heritage.AttributeCredits, template.Attributes);
            }
        }

        Assert.True(templatesChecked > 0, "Expected at least one profession template across all heritages.");
        Assert.True(
            anyFullySpentAnywhere,
            "Expected at least one named preset template to fully spend its heritage's credit budget.");
    }

    [Fact]
    public void InstalledHeritages_PrimaryAndSecondaryStartAreaIndicesResolveIntoTheSharedList()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        int indicesChecked = 0;
        foreach (ChargenHeritageOptions heritage in options.HeritagesById.Values)
        {
            foreach (int index in heritage.PrimaryStartAreaIndices.Concat(heritage.SecondaryStartAreaIndices))
            {
                indicesChecked++;
                Assert.True(
                    options.TryGetStarterArea(index, out ChargenStarterArea? area),
                    $"{heritage.Name}: start-area index {index} does not resolve into the shared StarterAreas list.");
                Assert.False(string.IsNullOrEmpty(area!.Name));
            }
        }

        Assert.True(indicesChecked > 0, "Expected at least one heritage start-area reference.");
    }

    [Fact]
    public void InstalledHeritages_SkillCostsResolveToKnownWireSkillIds()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.True(options.TryGetHeritage(AluvianId, out ChargenHeritageOptions? aluvian));
        Assert.NotEmpty(aluvian!.SkillCostsBySkillId);
        foreach (var pair in aluvian.SkillCostsBySkillId)
        {
            Assert.Equal(pair.Key, pair.Value.SkillId);
            Assert.InRange(pair.Key, 1u, 54u);
            Assert.True(pair.Value.NormalCost >= 0);
            Assert.True(pair.Value.PrimaryCost >= 0);
        }
    }

    /// <summary>
    /// F2's completeness assertion: records EXACTLY what the installed DAT's
    /// heritage-vs-global skill-cost coverage looks like (found
    /// 2026-08-15), so <see cref="ChargenSkillCreditMath"/>'s two-tier
    /// fallback (see <see cref="AcDream.Core.CharGen.ChargenOptions.GlobalSkillCostsBySkillId"/>)
    /// has a real regression gate instead of only synthetic unit fixtures.
    /// Findings: the global SkillTable (portal.dat 0x0E000004) prices 38 of
    /// the 54 advancement skill ids; EVERY one of the 13 installed
    /// heritages ships EXACTLY one heritage-specific skill-cost override
    /// (never zero, never more), and that one override always ALSO has a
    /// global entry — no heritage in this DAT relies on a heritage-only
    /// price the global table doesn't know about. The remaining 16 skill
    /// ids are absent from BOTH tiers in every heritage — retail's genuine
    /// -1/"no cost" case (non-advancement or deprecated skill slots such as
    /// the pre-Skill-DID-remap gaps). If a future DAT drop changes any of
    /// this shape, this test should fail and get updated with the new
    /// reality, not be loosened silently.
    /// </summary>
    [Fact]
    public void InstalledHeritages_SkillCostFallbackCoversTheKnownUncostableSkillSet()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.Equal(38, options.GlobalSkillCostsBySkillId.Count);

        // Retail's -1/"no cost" case: absent from BOTH the global SkillTable
        // AND every heritage's own list in the installed DAT.
        uint[] expectedUncostableSkillIds =
            [1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 17, 25, 26, 42, 53];

        Assert.NotEmpty(options.HeritagesById);
        foreach (ChargenHeritageOptions heritage in options.HeritagesById.Values)
        {
            Assert.Single(heritage.SkillCostsBySkillId);

            var uncostable = new List<uint>();
            foreach (KeyValuePair<uint, ChargenSkillCost> pair in heritage.SkillCostsBySkillId)
            {
                Assert.True(
                    options.GlobalSkillCostsBySkillId.ContainsKey(pair.Key),
                    $"{heritage.Name}: skill {pair.Key} is heritage-only with no global fallback entry — " +
                    "new ground truth found; update this test's recorded reality.");
            }

            for (uint skillId = 1; skillId < ChargenSkillAdvancementSet.SlotCount; skillId++)
            {
                bool inHeritage = heritage.SkillCostsBySkillId.ContainsKey(skillId);
                bool inGlobal = options.GlobalSkillCostsBySkillId.ContainsKey(skillId);
                if (!inHeritage && !inGlobal)
                    uncostable.Add(skillId);
            }

            Assert.Equal(expectedUncostableSkillIds, uncostable.OrderBy(id => id));
        }
    }

    /// <summary>
    /// Campaign CC gate round 1 closeout (Group 2): pins
    /// <see cref="ChargenOptions.GlobalSkillDetailsBySkillId"/>'s real
    /// shape against the installed DAT — same 38-entry population as
    /// <see cref="ChargenOptions.GlobalSkillCostsBySkillId"/> (both read the
    /// SAME SkillTable loop), MinLevel distributed 23 at <c>&lt;= 1</c>
    /// (useable while Untrained) / 15 at exactly <c>2</c> (Trained
    /// required), per the Batch F investigation's own recorded finding, and
    /// never above 2 — <c>UpdateSkillEntry</c>'s own bucket test only ever
    /// distinguishes <c>&lt;= 1</c> from <c>&gt; 1</c>, so a MinLevel of 3
    /// would be observationally identical to 2 but is worth flagging if a
    /// future DAT drop ever introduces one.
    /// </summary>
    [Fact]
    public void InstalledSkillTable_GlobalSkillDetails_MinLevelDistributionMatchesCostCoverage()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.Equal(options.GlobalSkillCostsBySkillId.Count, options.GlobalSkillDetailsBySkillId!.Count);
        Assert.Equal(38, options.GlobalSkillDetailsBySkillId.Count);

        int useableUntrained = 0;
        int trainedRequired = 0;
        bool anyDescriptionNonEmpty = false;
        foreach (ChargenSkillDetail detail in options.GlobalSkillDetailsBySkillId.Values)
        {
            Assert.True(detail.MinLevel <= 2u, $"skill {detail.SkillId}: MinLevel {detail.MinLevel} exceeds Trained(2).");
            if (detail.MinLevel <= 1u)
                useableUntrained++;
            else
                trainedRequired++;
            anyDescriptionNonEmpty |= !string.IsNullOrEmpty(detail.Description);
        }

        Assert.Equal(23, useableUntrained);
        Assert.Equal(15, trainedRequired);
        Assert.True(anyDescriptionNonEmpty, "Expected at least one skill to carry a non-empty description.");
    }

    /// <summary>
    /// F5's strengthened installed-DAT gate. <see cref="ChargenGenderOptions.HasAnyAppearanceOptions"/>
    /// only proves an OR across eight lists for at least one gender per
    /// heritage (see <see cref="InstalledHeritages_EachHasAtLeastOneGenderWithNonEmptyAppearanceOptions"/>
    /// above). This test records the STRONGER fact actually found in the
    /// installed DAT (2026-08-15): every one of the eight
    /// <c>HasAnyAppearanceOptions</c> lists, PLUS the three color lists it
    /// deliberately excludes (<see cref="ChargenGenderOptions.HairColors"/>,
    /// <see cref="ChargenGenderOptions.EyeColors"/>,
    /// <see cref="ChargenGenderOptions.ClothingColors"/>), is non-empty for
    /// EVERY gender of EVERY one of the 13 heritages — even the sparse ones
    /// (Gear Knight and both Olthoi variants ship as few as 1-2 entries per
    /// list, but never 0). This is a fact about today's data, not a
    /// structural guarantee the DAT format enforces — the type's own doc
    /// comment still warns callers to defend against an empty list
    /// individually, and a future DAT could reintroduce a gap (e.g. a
    /// bald-only heritage's hair styles). If this test starts failing on a
    /// new DAT drop, that is this gate doing its job, not a reader bug.
    /// </summary>
    [Fact]
    public void InstalledHeritages_AppearanceOptionListsRecordedPerListCompleteness()
    {
        string? datDir = ContentConformanceDats.ResolveDatDir();
        if (datDir is null)
        {
            Console.WriteLine("SKIP: installed retail DAT directory is unavailable.");
            return;
        }

        using var dats = new DatCollection(datDir, DatAccessType.Read);
        using var adapter = new DatCollectionAdapter(dats);
        ChargenOptions options = ChargenTableReader.Load(adapter);

        Assert.NotEmpty(options.HeritagesById);
        var emptyLists = new List<string>();
        foreach (ChargenHeritageOptions heritage in options.HeritagesById.Values)
        {
            foreach (KeyValuePair<int, ChargenGenderOptions> genderPair in heritage.GendersByKey)
            {
                ChargenGenderOptions gender = genderPair.Value;
                string label = $"{heritage.Name}/{gender.Name} (heritage={heritage.HeritageId}, gender={genderPair.Key})";

                void RecordIfEmpty(string listName, int count)
                {
                    if (count == 0)
                        emptyLists.Add($"{label}: {listName}");
                }

                RecordIfEmpty(nameof(gender.HairStyles), gender.HairStyles.Count);
                RecordIfEmpty(nameof(gender.EyeStrips), gender.EyeStrips.Count);
                RecordIfEmpty(nameof(gender.NoseStrips), gender.NoseStrips.Count);
                RecordIfEmpty(nameof(gender.MouthStrips), gender.MouthStrips.Count);
                RecordIfEmpty(nameof(gender.Headgears), gender.Headgears.Count);
                RecordIfEmpty(nameof(gender.Shirts), gender.Shirts.Count);
                RecordIfEmpty(nameof(gender.Pants), gender.Pants.Count);
                RecordIfEmpty(nameof(gender.Footwear), gender.Footwear.Count);
                RecordIfEmpty(nameof(gender.HairColors), gender.HairColors.Count);
                RecordIfEmpty(nameof(gender.EyeColors), gender.EyeColors.Count);
                RecordIfEmpty(nameof(gender.ClothingColors), gender.ClothingColors.Count);
            }
        }

        Assert.Empty(emptyLists);
    }
}