/*************************************************************************
 * ModernUO                                                              *
 * Copyright 2019-2023 - ModernUO Development Team                       *
 * Email: hi@modernuo.com                                                *
 * File: MapLoader.cs                                                    *
 *                                                                       *
 * This program is free software: you can redistribute it and/or modify  *
 * it under the terms of the GNU General Public License as published by  *
 * the Free Software Foundation, either version 3 of the License, or     *
 * (at your option) any later version.                                   *
 *                                                                       *
 * You should have received a copy of the GNU General Public License     *
 * along with this program.  If not, see <http://www.gnu.org/licenses/>. *
 *************************************************************************/

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Text.Json;
using System.Text.Json.Serialization;
using Server.Json;
using Server.Logging;

namespace Server;

public static class MapLoader
{
    private static readonly ILogger logger = LogFactory.GetLogger(typeof(MapLoader));

    /* Here we configure all maps. Some notes:
     *
     * 1) The first 32 maps are reserved for core use.
     * 2) Map 127 is reserved for core use.
     * 3) Map 255 is reserved for core use.
     * 4) Changing or removing any predefined maps may cause server instability.
     *
     * Map definitions are modified in Data/Map Definitions/<expansion>.json:
     *  - <index> : An unreserved unique index for this map
     *  - <id> : An identification number used in client communications. For any visible maps, this value must be from 0-5
     *  - <fileIndex> : A file identification number. For any visible maps, this value must be from 0-5
     *  - <width>, <height> : Size of the map (in tiles)
     *  - <season> : Season of the map. 0 = Spring, 1 = Summer, 2 = Fall, 3 = Winter, 4 = Desolation
     *  - <name> : Reference name for the map, used in props gump, get/set commands, region loading, etc
     *  - <rules> : Rules and restrictions associated with the map. See documentation for details
     */
    [CallPriority(2)]
    public static void Configure()
    {
        var failures = new List<string>();
        var count = 0;

        var path = Path.Combine(Core.BaseDirectory, "Data/map-definitions.json");

        logger.Information("Loading Map Definitions");

        var stopwatch = Stopwatch.StartNew();
        var maps = JsonConfig.Deserialize<List<MapDefinition>>(path);
        if (maps == null)
        {
            throw new JsonException($"Failed to deserialize {path}.");
        }

        foreach (var def in maps)
        {
            try
            {
                RegisterMap(def);
                count++;
            }
            catch (Exception ex)
            {
                logger.Debug(ex, "Failed to load map definition {MapDefName} ({MapDefId})", def.Name, def.Id);
                failures.Add($"\tInvalid map definition {def.Name} ({def.Id})");
            }
        }

        stopwatch.Stop();

        if (failures.Count > 0)
        {
            logger.Warning(
                $"Loading map definitions {{Status}} ({{Count}} maps, {{FailureCount}} failures) ({{Duration:F2}} seconds){Environment.NewLine}{{Failures}}",
                "failed",
                count,
                failures.Count,
                stopwatch.Elapsed.TotalSeconds,
                failures
            );
        }
        else
        {
            logger.Information(
                "Loading map definitions {Status} ({Count} maps, {FailureCount} failures) ({Duration:F2} seconds)",
                "done",
                count,
                failures.Count,
                stopwatch.Elapsed.TotalSeconds
            );
        }
    }

    private static void RegisterMap(MapDefinition mapDefinition)
    {
        var newMap = new Map(
            mapDefinition.Id,
            mapDefinition.Index,
            mapDefinition.FileIndex,
            Math.Max(mapDefinition.Width, Map.SectorSize),
            Math.Max(mapDefinition.Height, Map.SectorSize),
            mapDefinition.Season,
            mapDefinition.Name,
            mapDefinition.Rules
        );

        Map.Maps[mapDefinition.Index] = newMap;
        Map.AllMaps.Add(newMap);
    }

    internal class MapDefinition
    {
        [JsonPropertyName("index")]
        public int Index { get; set; }

        [JsonPropertyName("id")]
        public int Id { get; set; }

        [JsonPropertyName("fileIndex")]
        public int FileIndex { get; set; }

        [JsonPropertyName("name")]
        public string Name { get; set; }

        [JsonPropertyName("width")]
        public int Width { get; set; }

        [JsonPropertyName("height")]
        public int Height { get; set; }

        [JsonPropertyName("season")]
        public int Season { get; set; }

        [JsonPropertyName("rules")]
        public MapRules Rules { get; set; }
    }
}