using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using FluentAssertions;
using PKHeX.Core;
using Xunit;

namespace PKHeX.Tests.Simulator
{
    public class ShowdownSetTests
    {
        private const string SimulatorParse = "Set Parsing Tests";

        static ShowdownSetTests()
        {
            if (!EncounterEvent.Initialized)
                EncounterEvent.RefreshMGDB();
        }

        [Fact]
        public void SimulatorGetParse()
        {
            foreach (var setstr in Sets)
            {
                var set = new ShowdownSet(setstr).Text;
                var lines = set.Split('\n').Select(z => z.Trim());
                Assert.True(lines.All(z => setstr.Contains(z)), setstr);
            }
        }

        [Fact]
        public void SimulatorGetEncounters()
        {
            var set = new ShowdownSet(SetGlaceonUSUMTutor);
            var pk7 = new PK7 {Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves};
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.MN);
            Assert.True(!encs.Any());
            pk7.HT_Name = "PKHeX";
            encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.MN);
            var first = encs.FirstOrDefault();
            Assert.True(first != null);

            var egg = (EncounterEgg)first;
            var info = new SimpleTrainerInfo();
            var pk = egg.ConvertToPKM(info);
            Assert.True(pk.Species != set.Species);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);

            var test = EncounterMovesetGenerator.GeneratePKMs(pk7, info).ToList();
            foreach (var t in test)
            {
                var la2 = new LegalityAnalysis(t);
                Assert.True(la2.Valid);
            }
        }

        [Fact]
        public void SimulatorGetWC3()
        {
            var set = new ShowdownSet(SetROCKSMetang);
            var pk3 = new PK3 { Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves };
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk3, set.Moves, GameVersion.R);
            Assert.True(encs.Any());
            encs = EncounterMovesetGenerator.GenerateEncounters(pk3, set.Moves, GameVersion.R);
            var first = encs.FirstOrDefault();
            Assert.True(first != null);

            var wc3 = (WC3)first;
            var info = new SimpleTrainerInfo();
            var pk = wc3.ConvertToPKM(info);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);
        }

        [Fact]
        public void SimulatorGetCelebi()
        {
            var set = new ShowdownSet(SetCelebi);
            var pk7 = new PK7 { Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves };
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.X);
            Assert.True(encs.Any());
            encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.X);
            var first = encs.FirstOrDefault();
            Assert.True(first != null);

            var enc = first;
            var info = new SimpleTrainerInfo();
            var pk = enc.ConvertToPKM(info);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);
        }

        [Fact]
        public void SimulatorGetSplitBreed()
        {
            var set = new ShowdownSet(SetMunchSnorLax);
            var pk7 = new PK7 { Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves, HT_Name = "PKHeX" }; // !! specify the HT name, we need tutors for this one
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.SN).ToList();
            Assert.True(encs.Count > 0);
            Assert.True(encs.All(z => z.Species > 150));

            var info = new SimpleTrainerInfo();
            var enc = encs[0];
            var pk = enc.ConvertToPKM(info);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);
        }

        [Fact]
        public void SimulatorGetVCEgg1()
        {
            var set = new ShowdownSet(SetSlowpoke12);
            var pk7 = new PK7 { Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves, HT_Name = "PKHeX" };
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.GD).ToList();
            Assert.True(encs.Count > 0);

            var info = new SimpleTrainerInfo();
            var enc = encs[0];
            var pk = enc.ConvertToPKM(info);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);
        }

        [Fact]
        public void SimulatorGetSmeargle()
        {
            var set = new ShowdownSet(SetSmeargle);
            var pk7 = new PK7 { Species = set.Species, AltForm = set.FormIndex, Moves = set.Moves };
            var encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.MN);
            Assert.True(encs.Any());
            encs = EncounterMovesetGenerator.GenerateEncounters(pk7, set.Moves, GameVersion.MN);
            var first = encs.FirstOrDefault();
            Assert.NotNull(first);

            var enc = first;
            var info = new SimpleTrainerInfo();
            var pk = enc.ConvertToPKM(info);

            var la = new LegalityAnalysis(pk);
            Assert.True(la.Valid);
        }

        [Fact]
        public void SimulatorParseMultiple()
        {
            var text = string.Join("\r\n\r\n", Sets);
            var lines = text.Split(new[] {"\r\n", "\n"}, StringSplitOptions.None);
            var sets = ShowdownSet.GetShowdownSets(lines);
            Assert.True(sets.Count() == Sets.Length);

            sets = ShowdownSet.GetShowdownSets(Enumerable.Empty<string>());
            Assert.True(!sets.Any());

            sets = ShowdownSet.GetShowdownSets(new [] {"", "   ", " "});
            Assert.True(!sets.Any());
        }

        public static IEnumerable<object[]> PokemonGenerationTestData()
        {
            for (int i = 1; i <= 807; i++)
            {
                yield return new object[] { i };
            }
        }

        [Theory(Skip = "Feature not ready yet")]
        [MemberData(nameof(PokemonGenerationTestData))]
        public void PokemonGenerationReturnsLegalPokemon(int species)
        {
            int count = 0;
            var tr = new SimpleTrainerInfo();    
            
            var pk = new PK7 { Species = species };
            pk.Gender = pk.GetSaneGender();
            var ez = EncounterMovesetGenerator.GeneratePKMs(pk, tr);
            foreach (var e in ez)
            {
                var la = new LegalityAnalysis(e);
                la.Valid.Should().BeTrue($"Because generated Pokemon {count} for {species:000} should be valid");
                Assert.True(la.Valid);
                count++;
            }
        }

        private const string SetROCKSMetang =
@"Metang
IVs: 20 HP / 3 Atk / 26 Def / 1 SpA / 6 SpD / 8 Spe
Ability: Clear Body
Level: 30
Adamant Nature
- Take Down
- Confusion
- Metal Claw
- Refresh";

        private const string SetGlaceonUSUMTutor =
@"Glaceon (F) @ Assault Vest
IVs: 0 Atk
EVs: 252 HP / 252 SpA / 4 SpD
Ability: Ice Body
Level: 100
Shiny: Yes
Modest Nature
- Blizzard
- Water Pulse
- Shadow Ball
- Hyper Voice";

        private const string SetSmeargle =
@"Smeargle @ Focus Sash
Ability: Own Tempo
EVs: 248 HP / 8 Def / 252 Spe
Jolly Nature
- Sticky Web
- Nuzzle
- Taunt
- Whirlwind";

        private const string SetCelebi =
@"Celebi @ Toxic Orb
Ability: Natural Cure
Jolly Nature
- Recover
- Heal Bell
- Safeguard
- Hold Back";

        private const string SetNicknamedTypeNull =
@"Reliance (Type: Null) @ Eviolite
EVs: 252 HP / 4 Def / 252 SpD
Ability: Battle Armor
Careful Nature
- Facade
- Swords Dance
- Sleep Talk
- Rest";

        private const string SetMunchSnorLax =
@"Snorlax @ Choice Band
Ability: Thick Fat
Level: 50
EVs: 84 HP / 228 Atk / 180 Def / 12 SpD / 4 Spe
Adamant Nature
- Double-Edge
- High Horsepower
- Self-Destruct
- Fire Punch";

        private const string SetSlowpoke12 =
@"Threat (Slowpoke) @ Eviolite
Ability: Regenerator
Shiny: Yes
EVs: 248 HP / 252 Atk / 8 SpD
Adamant Nature
- Body Slam
- Earthquake
- Belly Drum
- Iron Tail";

        private static readonly string[] Sets =
        {
            SetGlaceonUSUMTutor,
            SetNicknamedTypeNull,
            SetMunchSnorLax,

@"Greninja @ Choice Specs
Ability: Battle Bond
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Hydro Pump
- Spikes
- Water Shuriken
- Dark Pulse",
        };
    }
}