module Degenz.Admin

open System
open System.IO
open System.Reflection
open System.Threading.Tasks
open DSharpPlus
open DSharpPlus.Entities
open DSharpPlus.EventArgs
open DSharpPlus.SlashCommands
open Degenz.Messaging
open Npgsql.FSharp

type InitEmbeds =
    | Dojo = 0
    | Whitelist = 1
    | Slots = 2
    | JpegStore = 3

let handleGuildDownloadReady (_ : DiscordClient) (event : GuildDownloadCompletedEventArgs) =
    task {
        let ( _ , guild ) = event.Guilds.TryGetValue(GuildEnvironment.guildId)
        let! commands = guild.GetApplicationCommandsAsync()
        let ( _ , adminRole ) = guild.Roles.TryGetValue(GuildEnvironment.roleAdmin)

        let permission = DiscordApplicationCommandPermission(adminRole, true)
        let commands = commands |> Seq.map (fun com -> DiscordGuildApplicationCommandPermissions(com.Id, [ permission ]))
        do! guild.BatchEditApplicationCommandPermissionsAsync(commands) |> Async.AwaitTask |> Async.Ignore
        return ()
    } :> Task

let sendEmbed embed (ctx : IDiscordContext) =
    task {
        match embed with
        | InitEmbeds.Dojo -> Trainer.sendInitialEmbed ctx
        | InitEmbeds.Whitelist -> InviteTracker.sendInitialEmbed ctx
        | InitEmbeds.Slots -> SlotMachine.sendInitialEmbedFromSlashCommand ctx
        | InitEmbeds.JpegStore -> Store.sendInitialEmbed ctx
        | _ -> ()
        do! Messaging.sendSimpleResponse ctx "Sent!"
    } :> Task

let getAllReactions (msg : DiscordMessage) (ctx : IDiscordContext) : Task<DiscordUser seq> =
    task {
        let mutable listOfUsers = ResizeArray<DiscordUser>(512)

        let mutable emojiCount = 0
        for reaction in msg.Reactions do
            let mutable count = 0
            for r in 0..reaction.Count / 100 do
                let rs =
                    if count > 0 then
                        msg.GetReactionsAsync(reaction.Emoji, 100, listOfUsers.[listOfUsers.Count - 1].Id) |> Async.AwaitTask |> Async.RunSynchronously
                    else
                        msg.GetReactionsAsync(reaction.Emoji, 100) |> Async.AwaitTask |> Async.RunSynchronously
                listOfUsers.AddRange(rs)
                count <- count + 1
                let builder = DiscordFollowupMessageBuilder().AsEphemeral(true)
                builder.Content <- $"Reading {emojiCount + 1} out of {msg.Reactions.Count}: {reaction.Emoji.Name} with {reaction.Count} reactions"
                do! ctx.FollowUp builder
                do! Async.Sleep 1800
            emojiCount <- emojiCount + 1
                
        return listOfUsers
    }

let getCsvFromUsersList users =
    users
    |> List.ofSeq
    |> List.map (fun (user : DiscordUser) ->
        {| Id = user.Id ; FullName = $"{user.Username}#{user.Discriminator}" |})
    |> List.distinctBy (fun u -> u.Id)
    |> List.map (fun user -> $"{user.Id},{user.FullName}")
    |> String.concat "\n"
    |> (+) "Discord Id Num,Username\n"

let getCsvFromTotalInvites (users : {| Username : string ; DiscordId : uint64 ; TotalInvites : int |} seq) =
    users
    |> Seq.map (fun user -> $"{user.DiscordId},{user.Username},{user.TotalInvites}")
    |> String.concat "\n"
    |> (+) "Discord Id Num,Username,Total Invites\n"

let getUserInvites userIds =
    GuildEnvironment.connectionString
    |> Sql.connect
    |> Sql.parameters [ "dids" , Sql.stringArray (userIds |> Seq.toArray) ]
    |> Sql.query """
            SELECT usr.display_name, inviter, count(invite_id) AS total_invites FROM invite
            JOIN invited_user iu ON invite.id = iu.invite_id
            JOIN "user" usr ON invite.inviter = usr.discord_id
            WHERE iu.accepted = true AND inviter = ANY (@dids)
            GROUP BY inviter, usr.display_name
            ORDER BY total_invites DESC;
        """
    |> Sql.executeAsync (fun read -> {| Username = read.string "display_name" ; DiscordId = read.string "inviter" |> uint64 ; TotalInvites = read.int "total_invites" |})
    |> Async.AwaitTask

let getUsersFromMessageReactions (channel : DiscordChannel) (message : string) (ctx : IDiscordContext) =
    task {
        do! Messaging.defer ctx
        let ( result , mId ) = UInt64.TryParse(message)
        if result then 
            let! msg = channel.GetMessageAsync(message |> uint64) |> Async.AwaitTask
            let! reactions = getAllReactions msg ctx
            let csv = getCsvFromUsersList reactions
            let builder = DiscordFollowupMessageBuilder().AsEphemeral(true)
            use ms = new MemoryStream(Text.Encoding.ASCII.GetBytes(csv)) :> Stream
            let dict = Collections.Generic.Dictionary()
            dict.Add("users.csv", ms)
            builder.AddFiles(dict) |> ignore
            do! ctx.FollowUp(builder)
        else
            do! Messaging.sendSimpleResponse ctx $"The message ID provided was not a valid: {message}"
    } :> Task

let getUserInvitesFromReactions (channel : DiscordChannel) (message : string) (ctx : IDiscordContext) =
    task {
        do! Messaging.defer ctx
        let! msg = channel.GetMessageAsync(message |> uint64) |> Async.AwaitTask
        let! users = getAllReactions msg ctx
        try
        let! invites = getUserInvites (users |> Seq.map (fun u -> string u.Id))
        let csv = getCsvFromTotalInvites (invites)
        let builder = DiscordFollowupMessageBuilder().AsEphemeral(true)
        use ms = new MemoryStream(Text.Encoding.ASCII.GetBytes(csv)) :> Stream
        let dict = Collections.Generic.Dictionary()
        dict.Add("users.csv", ms)
        builder.AddFiles(dict) |> ignore
        do! ctx.FollowUp(builder)
        with ex ->
            printfn $"exception {ex.Message}"
    } :> Task

type AdminBot() =
    inherit ApplicationCommandModule ()

    let enforceAdmin  (ctx : IDiscordContext) (adminFn : IDiscordContext -> Task) =
        let isAdmin = Seq.exists (fun (role : DiscordRole) -> role.Id = GuildEnvironment.roleAdmin) (ctx.GetDiscordMember().Roles)
        if isAdmin then
            adminFn ctx
        else
            Messaging.sendSimpleResponse ctx $"You are not admin" |> Async.StartAsTask :> Task

    [<SlashCommandPermissions(Permissions.Administrator)>]
    [<SlashCommand("admin-invites", "Get total invites from a specific user", false)>]
    member this.GetAttributions (ctx : InteractionContext, [<Option("player", "The player you want to check")>] user : DiscordUser) =
        enforceAdmin (DiscordInteractionContext ctx) (InviteTracker.getInvitedUsersForId user)

    [<SlashCommandPermissions(Permissions.Administrator)>]
    [<SlashCommand("admin-whitelist-stock", "Set whitelist stock", false)>]
    member this.SetStock (ctx : InteractionContext, [<Option("amount", "Set the amount of WL available for purchase")>] amount : int64) =
        enforceAdmin (DiscordInteractionContext ctx) (InviteTracker.setCurrentWhitelistStock (int amount))

    [<SlashCommandPermissions(Permissions.Administrator)>]
    [<SlashCommand("admin-send-embed", "Set whitelist stock", false)>]
    member this.SendEmbedToChannel (ctx : InteractionContext, [<Option("embed", "Which embed to send")>] embed : InitEmbeds) =
        enforceAdmin (DiscordInteractionContext ctx) (sendEmbed embed)

    [<SlashCommandPermissions(Permissions.Administrator)>]
    [<SlashCommand("admin-get-msg-reactions", "Set whitelist stock", false)>]
    member this.GetMessageReactions (ctx : InteractionContext,
                                     [<Option("channel", "The channel where the message is")>] channel : DiscordChannel,
                                     [<Option("message-id", "The ID of the message with all the reactions")>] messageId : string) =
        enforceAdmin (DiscordInteractionContext ctx) (getUsersFromMessageReactions channel messageId)

    [<SlashCommandPermissions(Permissions.Administrator)>]
    [<SlashCommand("admin-get-invites-table", "Invites Table", false)>]
    member this.GetInvitesFromReactedMessages (ctx : InteractionContext,
                                     [<Option("channel", "The channel where the message is")>] channel : DiscordChannel,
                                     [<Option("message-id", "The ID of the message with all the reactions")>] messageId : string) =
        enforceAdmin (DiscordInteractionContext ctx) (getUserInvitesFromReactions channel messageId)