// Copyright (C) 2021-present sam (starshines.gay)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

using Catalogger.Backend.Database.Models;
using Dapper;
using Remora.Discord.API;
using Remora.Rest.Core;

namespace Catalogger.Backend.Database.Repositories;

public class GuildRepository(ILogger logger, DatabaseConnection conn)
    : IDisposable,
        IAsyncDisposable
{
    private readonly ILogger _logger = logger.ForContext<GuildRepository>();

    public async Task<Guild> GetAsync(Optional<Snowflake> id) => await GetAsync(id.Value.Value);

    public async Task<Guild> GetAsync(Snowflake id) => await GetAsync(id.Value);

    public async Task<Guild> GetAsync(ulong id)
    {
        _logger.Verbose("Getting guild config for {GuildId}", id);

        var guild = await conn.QueryFirstOrDefaultAsync<Guild>(
            "select * from guilds where id = @Id",
            new { Id = id }
        );
        if (guild == null)
            throw new CataloggerError("Guild not found, was not initialized during guild create");
        return guild;
    }

    public async Task<bool> IsGuildKnown(ulong id) =>
        await conn.ExecuteScalarAsync<bool>(
            "select exists(select id from guilds where id = @Id)",
            new { Id = id }
        );

    public async Task AddGuildAsync(ulong id) =>
        await conn.ExecuteAsync(
            """
            insert into guilds (id, key_roles, banned_systems, channels)
            values (@Id, array[]::bigint[], array[]::text[], @Channels::jsonb)
            on conflict do nothing
            """,
            new { Id = id, Channels = new Guild.ChannelConfig() }
        );

    public async Task BanSystemAsync(Snowflake guildId, Snowflake userId, string hid, Guid uuid)
    {
        await conn.ExecuteAsync(
            "update guilds set banned_systems = array_cat(banned_systems, @SystemIds) where id = @GuildId",
            new { GuildId = guildId.Value, SystemIds = (string[])[hid, uuid.ToString()] }
        );

        await conn.ExecuteAsync(
            """
            insert into pluralkit_systems (system_id, user_id, guild_id)
            values (@SystemId, @UserId, @GuildId)
            on conflict (system_id, user_id, guild_id) do nothing
            """,
            new
            {
                SystemId = uuid,
                UserId = userId.Value,
                GuildId = guildId.Value,
            }
        );
    }

    public async Task UnbanSystemAsync(Snowflake guildId, Snowflake userId, string hid, Guid uuid)
    {
        await conn.ExecuteAsync(
            "update guilds set banned_systems = array_remove(array_remove(banned_systems, @Hid), @Uuid) where id = @Id",
            new
            {
                GuildId = guildId.Value,
                Hid = hid,
                Uuid = uuid.ToString(),
            }
        );

        await conn.ExecuteAsync(
            """
            delete from pluralkit_systems where system_id = @SystemId
            and user_id = @UserId
            and guild_id = @GuildId
            """,
            new
            {
                SystemId = uuid,
                UserId = userId.Value,
                GuildId = guildId.Value,
            }
        );
    }

    public async Task<Snowflake[]> GetSystemAccountsAsync(Snowflake guildId, Guid systemId)
    {
        var bannedAccounts = await conn.QueryAsync<BannedSystem>(
            "select * from pluralkit_systems where system_id = @SystemId and guild_id = @GuildId",
            new { SystemId = systemId, GuildId = guildId.Value }
        );
        return bannedAccounts.Select(s => DiscordSnowflake.New(s.UserId)).ToArray();
    }

    private record BannedSystem(Guid SystemId, ulong UserId, ulong GuildId);

    public async Task UpdateConfigAsync(Snowflake id, Guild config) =>
        await conn.ExecuteAsync(
            """
            update guilds set channels = @Channels::jsonb,
                              messages = @Messages::jsonb,
                              ignored_channels = @IgnoredChannels,
                              ignored_roles = @IgnoredRoles,
                              key_roles = @KeyRoles
                          where id = @Id
            """,
            new
            {
                Id = id.Value,
                config.Channels,
                config.Messages,
                config.IgnoredChannels,
                config.IgnoredRoles,
                config.KeyRoles,
            }
        );

    public async Task ImportConfigAsync(
        ulong id,
        Guild.ChannelConfig channels,
        Guild.MessageConfig messages,
        string[] bannedSystems,
        List<ulong> keyRoles
    ) =>
        await conn.ExecuteAsync(
            "update guilds set channels = @channels::jsonb, messages = @messages::jsonb, banned_systems = @bannedSystems, key_roles = @keyRoles where id = @id",
            new
            {
                id,
                channels,
                messages,
                bannedSystems,
                keyRoles,
            }
        );

    public void Dispose()
    {
        conn.Dispose();
        GC.SuppressFinalize(this);
    }

    public async ValueTask DisposeAsync()
    {
        await conn.DisposeAsync();
        GC.SuppressFinalize(this);
    }
}