//
//  Game.cs
//
//  Copyright (c) František Boháček. All rights reserved.
//  Licensed under the MIT license. See LICENSE file in the project root for full license information.

using Microsoft.Extensions.Options;
using NosSmooth.Core.Stateful;
using NosSmooth.Game.Data;
using NosSmooth.Game.Data.Characters;
using NosSmooth.Game.Data.Chat;
using NosSmooth.Game.Data.Inventory;
using NosSmooth.Game.Data.Maps;
using NosSmooth.Game.Data.Mates;
using NosSmooth.Game.Data.Raids;
using NosSmooth.Game.Data.Social;

namespace NosSmooth.Game;

/// <summary>
/// Represents base nostale game class with the character, current map, friends and current raid.
/// </summary>
public class Game : IStatefulEntity
{
    private readonly GameOptions _options;
    private Map? _currentMap;

    /// <summary>
    /// Initializes a new instance of the <see cref="Game"/> class.
    /// </summary>
    /// <param name="options">The options for the game.</param>
    public Game(IOptions<GameOptions> options)
    {
        Semaphores = new GameSemaphores();
        _options = options.Value;
    }

    /// <summary>
    /// Gets the game semaphores.
    /// </summary>
    internal GameSemaphores Semaphores { get; }

    /// <summary>
    /// Gets the playing character of the client.
    /// </summary>
    public Character? Character { get; internal set; }

    /// <summary>
    /// Gets the mates of the current character.
    /// </summary>
    public Mates? Mates { get; internal set; }

    /// <summary>
    /// Gets or sets the inventory of the character.
    /// </summary>
    public Inventory? Inventory { get; internal set; }

    /// <summary>
    /// Get or sets the friends of the character.
    /// </summary>
    public IReadOnlyList<Friend>? Friends { get; internal set; }

    /// <summary>
    /// Gets or sets the skills of the player.
    /// </summary>
    public Skills? Skills { get; internal set; }

    /// <summary>
    /// Gets or sets the family.
    /// </summary>
    public Family? Family { get; internal set; }

    /// <summary>
    /// Gets or sets the group the player is in.
    /// </summary>
    public Group? Group { get; internal set; }

    /// <summary>
    /// Gets the current map of the client.
    /// </summary>
    /// <remarks>
    /// Will be null until current map packet is received.
    /// </remarks>
    public Map? CurrentMap
    {
        get => _currentMap;
        internal set { _currentMap = value; }
    }

    /// <summary>
    /// Gets the active raid the client is currently on.
    /// </summary>
    /// <remarks>
    /// May be null if there is no raid in progress.
    /// </remarks>
    public Raid? CurrentRaid { get; internal set; }

    /// <summary>
    /// Creates the mates if they are null, or updates the current mates.
    /// </summary>
    /// <param name="create">The function for creating the mates.</param>
    /// <param name="update">The function for updating the mates.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the mates.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated mates.</returns>
    internal async Task<Mates?> CreateOrUpdateMatesAsync
    (
        Func<Mates?> create,
        Func<Mates, Mates?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Mates,
            () => Mates,
            s => Mates = s,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the skills if they are null, or updates the current skills.
    /// </summary>
    /// <param name="create">The function for creating the skills.</param>
    /// <param name="update">The function for updating the skills.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the skills.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated skills.</returns>
    internal async Task<Skills?> CreateOrUpdateSkillsAsync
    (
        Func<Skills?> create,
        Func<Skills, Skills?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Skills,
            () => Skills,
            s => Skills = s,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the inventory if it is null, or updates the current inventory.
    /// </summary>
    /// <param name="create">The function for creating the inventory.</param>
    /// <param name="update">The function for updating the inventory.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the inventory.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated inventory.</returns>
    internal async Task<Inventory?> CreateOrUpdateInventoryAsync
    (
        Func<Inventory?> create,
        Func<Inventory, Inventory?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Inventory,
            () => Inventory,
            i => Inventory = i,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the family if it is null, or updates the current family.
    /// </summary>
    /// <param name="create">The function for creating the family.</param>
    /// <param name="update">The function for updating the family.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the family.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated family.</returns>
    internal async Task<Family?> CreateOrUpdateFamilyAsync
    (
        Func<Family?> create,
        Func<Family, Family?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        var family = await CreateOrUpdateAsync
        (
            GameSemaphoreType.Family,
            () => Family,
            c => Family = c,
            create,
            update,
            releaseSemaphore,
            ct
        );

        await CreateOrUpdateCharacterAsync
        (
            () => new Character
            {
                Family = family
            },
            c =>
            {
                c.Family = family;
                return c;
            },
            ct: ct
        );

        return family;
    }

    /// <summary>
    /// Creates the friends if it is null, or updates the current friends.
    /// </summary>
    /// <param name="create">The function for creating the friends.</param>
    /// <param name="update">The function for updating the friends.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the friends.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated friends.</returns>
    internal async Task<IReadOnlyList<Friend>?> CreateOrUpdateFriendsAsync
    (
        Func<IReadOnlyList<Friend>?> create,
        Func<IReadOnlyList<Friend>, IReadOnlyList<Friend>?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Friends,
            () => Friends,
            c => Friends = c,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the group if it is null, or updates the current group.
    /// </summary>
    /// <param name="create">The function for creating the group.</param>
    /// <param name="update">The function for updating the group.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the group.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated group.</returns>
    internal async Task<Group?> CreateOrUpdateGroupAsync
    (
        Func<Group?> create,
        Func<Group, Group?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Group,
            () => Group,
            c => Group = c,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the character if it is null, or updates the current character.
    /// </summary>
    /// <param name="create">The function for creating the character.</param>
    /// <param name="update">The function for updating the character.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the character.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated character.</returns>
    internal async Task<Character?> CreateOrUpdateCharacterAsync
    (
        Func<Character?> create,
        Func<Character, Character?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync
        (
            GameSemaphoreType.Character,
            () => Character,
            c => Character = c,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the map if it is null, or updates the current map.
    /// </summary>
    /// <param name="create">The function for creating the map.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the map.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated character.</returns>
    internal async Task<Map?> CreateMapAsync
    (
        Func<Map?> create,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateAsync
        (
            GameSemaphoreType.Map,
            m => CurrentMap = m,
            create,
            releaseSemaphore,
            ct
        );
    }

    /// <summary>
    /// Creates the map if it is null, or updates the current map.
    /// </summary>
    /// <param name="create">The function for creating the map.</param>
    /// <param name="update">The function for updating the map.</param>
    /// <param name="releaseSemaphore">Whether to release the semaphore used for changing the map.</param>
    /// <param name="ct">The cancellation token for cancelling the operation.</param>
    /// <returns>The updated character.</returns>
    internal async Task<Map?> CreateOrUpdateMapAsync
    (
        Func<Map?> create,
        Func<Map?, Map?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        return await CreateOrUpdateAsync<Map?>
        (
            GameSemaphoreType.Map,
            () => CurrentMap,
            m => CurrentMap = m,
            create,
            update,
            releaseSemaphore,
            ct
        );
    }

    private async Task<T> CreateAsync<T>
    (
        GameSemaphoreType type,
        Action<T> set,
        Func<T> create,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        await Semaphores.AcquireSemaphore(type, ct);

        try
        {
            var current = create();
            set(current);
            return current;
        }
        finally
        {
            if (releaseSemaphore)
            {
                Semaphores.ReleaseSemaphore(type);
            }
        }
    }

    private async Task<T?> CreateOrUpdateAsync<T>
    (
        GameSemaphoreType type,
        Func<T?> get,
        Action<T?> set,
        Func<T?> create,
        Func<T, T?> update,
        bool releaseSemaphore = true,
        CancellationToken ct = default
    )
    {
        await Semaphores.AcquireSemaphore(type, ct);

        try
        {
            var current = get();
            if (current is null)
            {
                current = create();
            }
            else
            {
                current = update(current);
            }

            set(current);
            return current;
        }
        finally
        {
            if (releaseSemaphore)
            {
                Semaphores.ReleaseSemaphore(type);
            }
        }
    }
}