namespace Cthangover.Tools.EntityEditor.Tests
{
    using System.Collections.Generic;
    using System.Linq;
    using System.Text.Json.Nodes;
    using Cthangover.Core.Mods.Testing;

    /// <summary>The data editors' document: files of one kind, add/copy/delete, texts, undo and what gets written.</summary>
    public class EntityDocumentTests
    {
        private const string Items = "{\n  \"Kind\": \"item\",\n  \"Items\": [\n    {\n      \"Id\": \"food/bread\",\n      \"Name\": \"items/food/bread/name\",\n      \"Cost\": 2,\n      \"heal\": 5\n    }\n  ]\n}\n";

        private static EntityDocument Load(out List<string> skipped) => EntityDocument.Load("item", "items/my_mod.json", new[]
        {
            ("items/food/bread.json", Items),
            ("characters/hero.json", "{\"Kind\": \"character\", \"Items\": [{\"Id\": \"hero\"}]}"),
            ("items/broken.json", "{\"Kind\": \"item\", \"Items\": [ {"),
            ("scenes/town.json", "{\"Name\": \"town\"}")
        }, out skipped);

        [ModTest("entity_document/load_takes_only_its_kind")]
        static void LoadTakesOnlyItsKind(ModTestContext ctx)
        {
            var document = Load(out var skipped);
            ModAssert.Equal(1, document.Records.Count, "only the item file");
            ModAssert.Equal("food/bread", document.Records[0].Id, "its entity");
            ModAssert.Equal("items/food/bread.json", document.Records[0].File, "its file");
            ModAssert.Equal(1, skipped.Count, "the broken file of this kind is reported");
            ModAssert.Equal("items/broken.json", skipped[0], "by path");
            ModAssert.Equal(0, document.ChangedFiles().Count, "nothing to write after loading");
        }

        [ModTest("entity_document/unknown_fields_survive")]
        static void UnknownFieldsSurvive(ModTestContext ctx)
        {
            var document = Load(out _);
            document.Records[0].Data["Cost"] = 3;

            var changed = document.ChangedFiles();
            ModAssert.Equal(1, changed.Count, "the changed file");
            var root = JsonNode.Parse(changed[0].Text).AsObject();
            var item = root["Items"][0].AsObject();
            ModAssert.Equal("3", item["Cost"].ToString(), "the edit");
            ModAssert.Equal("5", item["heal"].ToString(), "another mod's field is kept");
            ModAssert.Equal("item", root["Kind"].ToString(), "the kind is kept");
            ModAssert.True(changed[0].Text.EndsWith("}\n"), "LF line break at the end");
            ModAssert.Equal(Items.Replace("\"Cost\": 2", "\"Cost\": 3"), changed[0].Text, "the rest of the file is byte for byte the same");
        }

        [ModTest("entity_document/add_copy_delete")]
        static void AddCopyDelete(ModTestContext ctx)
        {
            var document = Load(out _);
            var added = document.Add(new JsonObject { ["Id"] = document.FreeId("food/bread") });
            ModAssert.Equal("food/bread_2", added.Id, "a taken id gets a number");
            ModAssert.Equal("items/my_mod.json", added.File, "new entries go to the new file");

            var copy = document.Duplicate(document.Find("food/bread"), document.FreeId("food/bread"));
            ModAssert.Equal("food/bread_3", copy.Id, "the copy gets a free id");
            ModAssert.Equal("items/food/bread.json", copy.File, "and stays in the original's file");
            ModAssert.Equal("5", copy.Data["heal"].ToString(), "with all fields");
            ModAssert.Equal("food/bread", document.Records[0].Id, "the original first");
            ModAssert.Equal("food/bread_3", document.Records[1].Id, "the copy right after it");

            document.Remove(document.Find("food/bread"));
            ModAssert.Null(document.Find("food/bread"), "removed");
            var files = document.ChangedFiles().Select(f => f.Path).OrderBy(p => p).ToList();
            ModAssert.Equal(2, files.Count, "both files are written");
            ModAssert.Equal("items/food/bread.json", files[0], "the changed one");
            ModAssert.Equal("items/my_mod.json", files[1], "the new one");
            ModAssert.True(document.ChangedFiles().First(f => f.Path == "items/my_mod.json").Text.Contains("\"Kind\": \"item\""), "a new file declares the kind");
        }

        [ModTest("entity_document/undo_restores_data_and_texts")]
        static void UndoRestoresDataAndTexts(ModTestContext ctx)
        {
            var document = Load(out _);
            document.LoadText("ru", "items/food/bread/name", "Хлеб");

            document.BeginChange();
            document.Records[0].Data["Cost"] = 9;
            document.SetText("ru", "items/food/bread/name", "Каравай");
            document.BeginChange();
            document.Add(new JsonObject { ["Id"] = "food/cake" });

            ModAssert.True(document.Undo(), "undo the add");
            ModAssert.Null(document.Find("food/cake"), "the new entry is gone");
            ModAssert.True(document.Undo(), "undo the edit");
            ModAssert.Equal("2", document.Find("food/bread").Data["Cost"].ToString(), "the cost is back");
            ModAssert.Equal("Хлеб", document.GetText("ru", "items/food/bread/name"), "the text is back");
            ModAssert.False(document.Undo(), "nothing more");
            ModAssert.Equal(0, document.ChangedFiles().Count + document.ChangedTexts().Count, "back to what is on disk");

            ModAssert.True(document.Redo(), "redo the edit");
            var texts = document.ChangedTexts();
            ModAssert.Equal(1, texts.Count, "one changed text");
            ModAssert.Equal("ru", texts[0].Language, "its language");
            ModAssert.Equal("items/food/bread/name", texts[0].Key, "its key");
            ModAssert.Equal("Каравай", texts[0].Value, "its value");

            document.MarkSaved();
            ModAssert.Equal(0, document.ChangedFiles().Count + document.ChangedTexts().Count, "nothing left after saving");
        }

        [ModTest("entity_document/validate_reports_ids")]
        static void ValidateReportsIds(ModTestContext ctx)
        {
            var document = Load(out _);
            ModAssert.Equal(0, document.Validate().Count, "a loaded mod is valid");
            document.Add(new JsonObject { ["Id"] = "FOOD/BREAD" });
            document.Add(new JsonObject { ["Name"] = "x" });

            var problems = document.Validate();
            ModAssert.Equal(2, problems.Count, "an empty id and a duplicate");
            ModAssert.Equal("tools/entity_editor/problem_id", problems[0].Key, "empty id first");
            ModAssert.Equal("tools/entity_editor/problem_duplicate", problems[1].Key, "a duplicate ignores case");
        }
    }
}