namespace NeonSprawl.Server.Game.Quests;

/// <summary>Maps <c>GET /game/world/quest-definitions</c> (NEO-115).</summary>
public static class QuestDefinitionsWorldApi
{
    public static WebApplication MapQuestDefinitionsWorldApi(this WebApplication app)
    {
        app.MapGet(
            "/game/world/quest-definitions",
            (IQuestDefinitionRegistry questRegistry) =>
            {
                var defs = questRegistry.GetDefinitionsInIdOrder();
                var quests = new List<QuestDefinitionJson>(defs.Count);
                foreach (var d in defs)
                {
                    quests.Add(
                        new QuestDefinitionJson
                        {
                            Id = d.Id,
                            DisplayName = d.DisplayName,
                            PrerequisiteQuestIds = d.PrerequisiteQuestIds,
                            Steps = MapSteps(d.Steps),
                        });
                }

                return Results.Json(
                    new QuestDefinitionsListResponse
                    {
                        SchemaVersion = QuestDefinitionsListResponse.CurrentSchemaVersion,
                        Quests = quests,
                    });
            });

        return app;
    }

    private static List<QuestStepDefinitionJson> MapSteps(IReadOnlyList<QuestStepDefRow> steps)
    {
        var list = new List<QuestStepDefinitionJson>(steps.Count);
        foreach (var step in steps)
        {
            list.Add(
                new QuestStepDefinitionJson
                {
                    Id = step.Id,
                    DisplayName = step.DisplayName,
                    Objectives = MapObjectives(step.Objectives),
                });
        }

        return list;
    }

    private static List<QuestObjectiveDefinitionJson> MapObjectives(IReadOnlyList<QuestObjectiveDefRow> objectives)
    {
        var list = new List<QuestObjectiveDefinitionJson>(objectives.Count);
        foreach (var objective in objectives)
        {
            list.Add(MapObjective(objective));
        }

        return list;
    }

    private static QuestObjectiveDefinitionJson MapObjective(QuestObjectiveDefRow objective) =>
        objective.Kind switch
        {
            "gather_item" or "inventory_has_item" => new QuestObjectiveDefinitionJson
            {
                Id = objective.Id,
                Kind = objective.Kind,
                ItemId = objective.ItemId,
                Quantity = objective.Quantity,
            },
            "craft_recipe" => new QuestObjectiveDefinitionJson
            {
                Id = objective.Id,
                Kind = objective.Kind,
                RecipeId = objective.RecipeId,
                Quantity = objective.Quantity,
            },
            "encounter_complete" => new QuestObjectiveDefinitionJson
            {
                Id = objective.Id,
                Kind = objective.Kind,
                EncounterId = objective.EncounterId,
            },
            _ => new QuestObjectiveDefinitionJson
            {
                Id = objective.Id,
                Kind = objective.Kind,
                ItemId = objective.ItemId,
                Quantity = objective.Quantity,
                RecipeId = objective.RecipeId,
                EncounterId = objective.EncounterId,
            },
        };
}