using System;
using System.Linq;
using System.Threading.Tasks;
using Discord.Commands;
using NadekoBot.Services;
using Discord;
using NadekoBot.Services.Database.Models;
using System.Collections.Generic;
using Discord.WebSocket;
using NadekoBot.Common.Attributes;
using NadekoBot.Common.TypeReaders;
using NadekoBot.Common.TypeReaders.Models;
using NadekoBot.Db;
using NadekoBot.Modules.Administration;
using NadekoBot.Modules.Permissions.Common;
using NadekoBot.Modules.Permissions.Services;

namespace NadekoBot.Modules.Permissions
{
    public partial class Permissions : NadekoModule<PermissionService>
    {
        private readonly DbService _db;

        public Permissions(DbService db)
        {
            _db = db;
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task Verbose(PermissionAction action = null)
        {
            using (var uow = _db.GetDbContext())
            {
                var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
                if (action is null) action = new PermissionAction(!config.VerbosePermissions); // New behaviour, can toggle.
                config.VerbosePermissions = action.Value;
                await uow.SaveChangesAsync();
                _service.UpdateCache(config);
            }
            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.verbose_true).ConfigureAwait(false);
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.verbose_false).ConfigureAwait(false);
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        [UserPerm(GuildPerm.Administrator)]
        [Priority(0)]
        public async Task PermRole([Leftover] IRole role = null)
        {
            if (role != null && role == role.Guild.EveryoneRole)
                return;
            
            if (role is null)
            {
                var cache = _service.GetCacheFor(ctx.Guild.Id);
                if (!ulong.TryParse(cache.PermRole, out var roleId) ||
                    (role = ((SocketGuild)ctx.Guild).GetRole(roleId)) is null)
                {
                    await ReplyConfirmLocalizedAsync(strs.permrole_not_set).ConfigureAwait(false);
                }
                else
                {
                    await ReplyConfirmLocalizedAsync(strs.permrole(Format.Bold(role.ToString()))).ConfigureAwait(false);
                }
                return;
            }

            using (var uow = _db.GetDbContext())
            {
                var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
                config.PermissionRole = role.Id.ToString();
                uow.SaveChanges();
                _service.UpdateCache(config);
            }

            await ReplyConfirmLocalizedAsync(strs.permrole_changed(Format.Bold(role.Name))).ConfigureAwait(false);
        }

        public enum Reset { Reset };

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        [UserPerm(GuildPerm.Administrator)]
        [Priority(1)]
        public async Task PermRole(Reset _)
        {
            using (var uow = _db.GetDbContext())
            {
                var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
                config.PermissionRole = null;
                await uow.SaveChangesAsync();
                _service.UpdateCache(config);
            }

            await ReplyConfirmLocalizedAsync(strs.permrole_reset).ConfigureAwait(false);
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task ListPerms(int page = 1)
        {
            if (page < 1)
                return;

            IList<Permissionv2> perms;

            if (_service.Cache.TryGetValue(ctx.Guild.Id, out var permCache))
            {
                perms = permCache.Permissions.Source.ToList();
            }
            else
            {
                perms = Permissionv2.GetDefaultPermlist;
            }

            var startPos = 20 * (page - 1);
            var toSend = Format.Bold(GetText(strs.page(page))) + "\n\n" + string.Join("\n",
                             perms.Reverse()
                                 .Skip(startPos)
                                 .Take(20)
                                 .Select(p =>
                                 {
                                     var str =
                                         $"`{p.Index + 1}.` {Format.Bold(p.GetCommand(Prefix, (SocketGuild)ctx.Guild))}";
                                     if (p.Index == 0)
                                         str += $" [{GetText(strs.uneditable)}]";
                                     return str;
                                 }));

            await ctx.Channel.SendMessageAsync(toSend).ConfigureAwait(false);
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task RemovePerm(int index)
        {
            index -= 1;
            if (index < 0)
                return;
            try
            {
                Permissionv2 p;
                using (var uow = _db.GetDbContext())
                {
                    var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
                    var permsCol = new PermissionsCollection<Permissionv2>(config.Permissions);
                    p = permsCol[index];
                    permsCol.RemoveAt(index);
                    uow.Remove(p);
                    await uow.SaveChangesAsync();
                    _service.UpdateCache(config);
                }

                await ReplyConfirmLocalizedAsync(strs.removed(
                    index + 1,
                    Format.Code(p.GetCommand(Prefix, (SocketGuild)ctx.Guild))));
            }
            catch (IndexOutOfRangeException)
            {
                await ReplyErrorLocalizedAsync(strs.perm_out_of_range).ConfigureAwait(false);
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task MovePerm(int from, int to)
        {
            from -= 1;
            to -= 1;
            if (!(from == to || from < 0 || to < 0))
            {
                try
                {
                    Permissionv2 fromPerm;
                    using (var uow = _db.GetDbContext())
                    {
                        var config = uow.GcWithPermissionsv2For(ctx.Guild.Id);
                        var permsCol = new PermissionsCollection<Permissionv2>(config.Permissions);

                        var fromFound = from < permsCol.Count;
                        var toFound = to < permsCol.Count;

                        if (!fromFound)
                        {
                            await ReplyErrorLocalizedAsync(strs.perm_not_found(++from));
                            return;
                        }

                        if (!toFound)
                        {
                            await ReplyErrorLocalizedAsync(strs.perm_not_found(++to));
                            return;
                        }
                        fromPerm = permsCol[from];

                        permsCol.RemoveAt(from);
                        permsCol.Insert(to, fromPerm);
                        await uow.SaveChangesAsync();
                        _service.UpdateCache(config);
                    }

                    await ReplyConfirmLocalizedAsync(strs.moved_permission(
                        Format.Code(fromPerm.GetCommand(Prefix, (SocketGuild)ctx.Guild)),
                        ++from,
                        ++to));
                    
                    return;
                }
                catch (Exception e) when (e is ArgumentOutOfRangeException || e is IndexOutOfRangeException)
                {
                }
            }
            await ReplyConfirmLocalizedAsync(strs.perm_out_of_range).ConfigureAwait(false);
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task SrvrCmd(CommandOrCrInfo command, PermissionAction action)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Server,
                PrimaryTargetId = 0,
                SecondaryTarget = SecondaryPermissionType.Command,
                SecondaryTargetName = command.Name.ToLowerInvariant(),
                State = action.Value,
                IsCustomCommand = command.IsCustom,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.sx_enable(
                    Format.Code(command.Name),
                    GetText(strs.of_command)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.sx_disable(
                    Format.Code(command.Name),
                    GetText(strs.of_command)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task SrvrMdl(ModuleOrCrInfo module, PermissionAction action)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Server,
                PrimaryTargetId = 0,
                SecondaryTarget = SecondaryPermissionType.Module,
                SecondaryTargetName = module.Name.ToLowerInvariant(),
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.sx_enable(
                    Format.Code(module.Name),
                    GetText(strs.of_module)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.sx_disable(
                    Format.Code(module.Name),
                    GetText(strs.of_module)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task UsrCmd(CommandOrCrInfo command, PermissionAction action, [Leftover] IGuildUser user)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.User,
                PrimaryTargetId = user.Id,
                SecondaryTarget = SecondaryPermissionType.Command,
                SecondaryTargetName = command.Name.ToLowerInvariant(),
                State = action.Value,
                IsCustomCommand = command.IsCustom,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.ux_enable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(user.ToString())));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.ux_disable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(user.ToString())));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task UsrMdl(ModuleOrCrInfo module, PermissionAction action, [Leftover] IGuildUser user)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.User,
                PrimaryTargetId = user.Id,
                SecondaryTarget = SecondaryPermissionType.Module,
                SecondaryTargetName = module.Name.ToLowerInvariant(),
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.ux_enable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(user.ToString())));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.ux_disable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(user.ToString())));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task RoleCmd(CommandOrCrInfo command, PermissionAction action, [Leftover] IRole role)
        {
            if (role == role.Guild.EveryoneRole)
                return;

            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Role,
                PrimaryTargetId = role.Id,
                SecondaryTarget = SecondaryPermissionType.Command,
                SecondaryTargetName = command.Name.ToLowerInvariant(),
                State = action.Value,
                IsCustomCommand = command.IsCustom,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.rx_enable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(role.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.rx_disable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(role.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task RoleMdl(ModuleOrCrInfo module, PermissionAction action, [Leftover] IRole role)
        {
            if (role == role.Guild.EveryoneRole)
                return;

            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Role,
                PrimaryTargetId = role.Id,
                SecondaryTarget = SecondaryPermissionType.Module,
                SecondaryTargetName = module.Name.ToLowerInvariant(),
                State = action.Value,
            }).ConfigureAwait(false);


            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.rx_enable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(role.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.rx_disable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(role.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task ChnlCmd(CommandOrCrInfo command, PermissionAction action, [Leftover] ITextChannel chnl)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Channel,
                PrimaryTargetId = chnl.Id,
                SecondaryTarget = SecondaryPermissionType.Command,
                SecondaryTargetName = command.Name.ToLowerInvariant(),
                State = action.Value,
                IsCustomCommand = command.IsCustom,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.cx_enable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(chnl.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.cx_disable(
                    Format.Code(command.Name),
                    GetText(strs.of_command),
                    Format.Code(chnl.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task ChnlMdl(ModuleOrCrInfo module, PermissionAction action, [Leftover] ITextChannel chnl)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Channel,
                PrimaryTargetId = chnl.Id,
                SecondaryTarget = SecondaryPermissionType.Module,
                SecondaryTargetName = module.Name.ToLowerInvariant(),
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.cx_enable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(chnl.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.cx_disable(
                    Format.Code(module.Name),
                    GetText(strs.of_module),
                    Format.Code(chnl.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task AllChnlMdls(PermissionAction action, [Leftover] ITextChannel chnl)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Channel,
                PrimaryTargetId = chnl.Id,
                SecondaryTarget = SecondaryPermissionType.AllModules,
                SecondaryTargetName = "*",
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.acm_enable(
                    Format.Code(chnl.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.acm_disable(
                    Format.Code(chnl.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task AllRoleMdls(PermissionAction action, [Leftover] IRole role)
        {
            if (role == role.Guild.EveryoneRole)
                return;

            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Role,
                PrimaryTargetId = role.Id,
                SecondaryTarget = SecondaryPermissionType.AllModules,
                SecondaryTargetName = "*",
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.arm_enable(
                    Format.Code(role.Name)));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.arm_disable(
                    Format.Code(role.Name)));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task AllUsrMdls(PermissionAction action, [Leftover] IUser user)
        {
            await _service.AddPermissions(ctx.Guild.Id, new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.User,
                PrimaryTargetId = user.Id,
                SecondaryTarget = SecondaryPermissionType.AllModules,
                SecondaryTargetName = "*",
                State = action.Value,
            }).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.aum_enable(
                    Format.Code(user.ToString())));
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.aum_disable(
                    Format.Code(user.ToString())));
            }
        }

        [NadekoCommand, Aliases]
        [RequireContext(ContextType.Guild)]
        public async Task AllSrvrMdls(PermissionAction action)
        {
            var newPerm = new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.Server,
                PrimaryTargetId = 0,
                SecondaryTarget = SecondaryPermissionType.AllModules,
                SecondaryTargetName = "*",
                State = action.Value,
            };

            var allowUser = new Permissionv2
            {
                PrimaryTarget = PrimaryPermissionType.User,
                PrimaryTargetId = ctx.User.Id,
                SecondaryTarget = SecondaryPermissionType.AllModules,
                SecondaryTargetName = "*",
                State = true,
            };

            await _service.AddPermissions(ctx.Guild.Id,
                newPerm,
                allowUser).ConfigureAwait(false);

            if (action.Value)
            {
                await ReplyConfirmLocalizedAsync(strs.asm_enable).ConfigureAwait(false);
            }
            else
            {
                await ReplyConfirmLocalizedAsync(strs.asm_disable).ConfigureAwait(false);
            }
        }
    }
}