/*
Yarn Spinner is licensed to you under the terms found in the file LICENSE.md.
*/

#if !USE_UNITY_LOCALIZATION
using System.Collections.Generic;
using System.Threading;
using UnityEngine;

#nullable enable

namespace Yarn.Unity.UnityLocalization
{
    /// <summary>
    /// A line provider that uses the Unity Localization system to get localized
    /// content for Yarn lines.
    /// </summary>
    public partial class UnityLocalisedLineProvider : LineProviderBehaviour
    {
        // When Unity Localization is not installed, types like TableReference
        // no longer exist, and can't be deserialized into. This causes a loss
        // of data. To get around this, we declare a new type with the same
        // shape as TableReference to keep the data in. If and when Unity
        // Localization is added to the project, the data stored in these fields
        // is deserialized into actual TableReferences.
        [System.Serializable]
        public struct PlaceholderTableReference
        {
            [System.Serializable]
            public struct PlaceholderTableIdentifier
            {
                [SerializeField] private string m_TableCollectionName;
            }

            [SerializeField] private PlaceholderTableIdentifier m_TableReference;
        }

        [SerializeField] internal PlaceholderTableReference? stringsTable;
        [SerializeField] internal PlaceholderTableReference? assetTable;

        /// <inheritdoc/>
        public override string LocaleCode { get => "error"; set { } }

        private const string NotInstalledError = nameof(UnityLocalisedLineProvider) + "requires that the Unity Localization package is installed in the project. To fix this, install Unity Localization.";

        /// <inheritdoc/>
        public override YarnTask PrepareForLinesAsync(IEnumerable<string> lineIDs, CancellationToken cancellationToken)
        {
            Debug.LogError(NotInstalledError);
            return YarnTask.CompletedTask;
        }

        /// <inheritdoc/>
        public override void Start()
        {
            Debug.LogError(NotInstalledError);
        }

        /// <inheritdoc/>
        public override YarnTask<LocalizedLine> GetLocalizedLineAsync(Yarn.Line line, CancellationToken cancellationToken)
        {
            Debug.LogError($"{nameof(UnityLocalisedLineProvider)}: Can't create a localised line for ID {line.ID} because the Unity Localization package is not installed in this project. To fix this, install Unity Localization.");

            return YarnTask.FromResult(new LocalizedLine()
            {
                TextID = line.ID,
                RawText = $"{line.ID}: Unable to create a localised line, because the Unity Localization package is not installed in this project.",
                Substitutions = line.Substitutions,
            });
        }

        /// <inheritdoc/>
        public override void RegisterMarkerProcessor(string attributeName, Markup.IAttributeMarkerProcessor markerProcessor)
        {
            Debug.LogWarning($"Unable to add a marker processor for {attributeName}, as the Unity Localization package is not installed in this project");
        }

        /// <inheritdoc/>
        public override void DeregisterMarkerProcessor(string attributeName)
        {
            Debug.LogWarning($"Unable to remove a marker processor for {attributeName}, as the Unity Localization package is not installed in this project");
        }
    }

#if UNITY_EDITOR
    namespace Editor
    {
        using UnityEditor;
        [CustomEditor(typeof(UnityLocalisedLineProvider))]
        public class UnityLocalisedLineProviderPlaceholderEditor : Editor
        {
            public override void OnInspectorGUI()
            {
                EditorGUILayout.HelpBox("Unity Localization is not installed.", MessageType.Warning);
            }
        }
    }
#endif

}
#endif