namespace Aeshnidae.Codex;

/// <summary>
/// Read from Settings.json in the deployed mod folder; written with defaults on first
/// run. Nothing here touches the sections' content - each mod renders its own pages.
/// </summary>
public class Settings
{
    public const string FileName = "Settings.json";

    /// <summary>
    /// The weenie the Codex is made from. 364 is retail's blank "Book": fifty pages of a
    /// thousand characters, the writable kind vendors sold - so the client already
    /// knows how to open it, page it and render it. Changing this to a book with fewer
    /// pages truncates the Codex; the contents page says how many fit.
    /// </summary>
    public uint BookWcid { get; set; } = 364;

    /// <summary>What the book is called. Also how an existing one is recognised, so rename with care.</summary>
    public string Name { get; set; } = "Aelrynth Codex";

    /// <summary>The line under the title when the book is examined.</summary>
    public string Inscription { get; set; } = "Everything the server knows about you, rewritten each time you open it.";

    /// <summary>A dat icon id to use instead of the book's own. 0 keeps the book's icon.</summary>
    public uint IconOverride { get; set; } = 0;

    /// <summary>Hand a Codex to every character that enters the world without one.</summary>
    public bool GrantOnLogin { get; set; } = true;

    /// <summary>
    /// Characters per page. Retail parchment was 1,000 and the book window was built
    /// for it; a page longer than the book's own MaxNumCharsPerPage is cut regardless.
    /// </summary>
    public int MaxCharsPerPage { get; set; } = 1000;

    /// <summary>
    /// The mods whose CodexPage is asked for pages, in book order. A mod that is off,
    /// or has no CodexPage, is skipped. /codex sections shows which answer.
    /// </summary>
    public string[] Sections { get; set; } =
    {
        "Aeshnidae.Bank",
        "Aeshnidae.SkillMastery",
        "Aeshnidae.ResonanceAuras",
        "Aeshnidae.QuestBonus",
        "Aeshnidae.Enlightenment",
        "Aeshnidae.Leaderboard",
    };

    private static readonly JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented = true,
        ReadCommentHandling = JsonCommentHandling.Skip,
        AllowTrailingCommas = true,
    };

    public static Settings Load(string modPath)
    {
        var path = Path.Combine(modPath, FileName);

        try
        {
            if (File.Exists(path))
            {
                var loaded = JsonSerializer.Deserialize<Settings>(File.ReadAllText(path), JsonOptions) ?? new Settings();
                loaded.Sections ??= Array.Empty<string>();
                return loaded;
            }

            var defaults = new Settings();
            defaults.Save(modPath);
            ModManager.Log($"[{Mod.Name}] wrote default settings to {path}");
            return defaults;
        }
        catch (Exception ex)
        {
            ModManager.Log($"[{Mod.Name}] could not read {path}, using defaults: {ex.Message}", ModManager.LogLevel.Warn);
            return new Settings();
        }
    }

    public void Save(string modPath)
    {
        try
        {
            File.WriteAllText(Path.Combine(modPath, FileName), JsonSerializer.Serialize(this, JsonOptions));
        }
        catch (Exception ex)
        {
            ModManager.Log($"[{Mod.Name}] could not save settings: {ex.Message}", ModManager.LogLevel.Error);
        }
    }
}