module Degenz.InviteTracker

open System.Text
open System.Threading.Tasks
open DSharpPlus
open DSharpPlus.Entities
open DSharpPlus.EventArgs
open DSharpPlus.SlashCommands
open Degenz.Messaging
open Npgsql.FSharp
open Solnet.Rpc
open Solnet.Wallet

let connStr = GuildEnvironment.connectionString
let InviteRewardAmount = 100<GBT>
let InviteLinkButtonText = "Get My Invite Link"

type Invite = {
    Code : string
    Inviter : uint64
    Count : int
}

let private mapInvite (reader : RowReader) = {
    Code = reader.string "code"
    Inviter = reader.string "inviter" |> uint64
    Count = reader.int "count"
}

let private getInvites () = async {
    let! invites =
        connStr
        |> Sql.connect
        |> Sql.query "SELECT code, inviter, count FROM invite"
        |> Sql.executeAsync mapInvite
        |> Async.AwaitTask
    return
        invites
        |> List.map (fun inv -> (inv.Code , (inv.Inviter , inv.Count)))
        |> Map.ofList
}

let private getInvitesFromUser discordId = async {
    let! invites =
        connStr
        |> Sql.connect
        |> Sql.parameters [ "did" , Sql.string (string discordId) ]
        |> Sql.query """
                SELECT code, count FROM invite
                WHERE inviter = @did AND invite.created_at > NOW() at time zone 'utc' - INTERVAL '72 HOURS'
           """
        |> Sql.executeAsync (fun read -> {
                Code = read.string "code"
                Inviter = discordId
                Count = read.int "count"
            })
        |> Async.AwaitTask
    return
        invites
        |> List.map (fun inv -> (inv.Code , (inv.Inviter , inv.Count)))
        |> Map.ofList
}

let private createInvite inviter code =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "code" , Sql.string code ; "inviter" , Sql.string (string inviter) ]
    |> Sql.query "INSERT INTO invite (code, inviter) VALUES (@code, @inviter)"
    |> Sql.executeNonQueryAsync
    |> Async.AwaitTask

let private addInvitedUser did code count =
    try
        connStr
        |> Sql.connect
        |> Sql.executeTransactionAsync [
            """
                INSERT INTO invited_user (discord_id, invite_id)
                VALUES (@did, (SELECT id FROM invite WHERE code = @code));
            """ , [ [ "@code" , Sql.string code ; "@did" , Sql.string (string did) ] ]
            "UPDATE invite SET count = @count WHERE code = @code" , [ [ "count" , Sql.int count ; "code" , Sql.string code ] ]
        ]
        |> Async.AwaitTask
        |> Async.Ignore
    with _ -> async.Zero ()

let private markInvitedAccepted did =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string did) ]
    |> Sql.query "UPDATE invited_user SET accepted = true, updated_at = timezone('utc'::text, now()) WHERE discord_id = @did"
    |> Sql.executeNonQueryAsync
    |> Async.AwaitTask

let private getInviteFromInvitedUser invitedUser =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string invitedUser) ]
    |> Sql.query """
            SELECT code, inviter, count FROM invite
            JOIN invited_user iu ON invite.id = iu.invite_id
            WHERE iu.discord_id = @did
        """
    |> Sql.executeRowAsync mapInvite
    |> Async.AwaitTask

let private removeInvitedUser did =
    try
        connStr
        |> Sql.connect
        |> Sql.parameters [ "did" , Sql.string (string did) ]
        |> Sql.query "DELETE FROM invited_user WHERE discord_id = @did"
        |> Sql.executeNonQueryAsync
        |> Async.AwaitTask
        |> Async.Ignore
    with _ -> async.Zero ()

let private checkUserAlreadyInvited userId = async {
    let! result =
        connStr
        |> Sql.connect
        |> Sql.parameters [ "did" , Sql.string (string userId) ]
        |> Sql.query """
                SELECT id FROM invited_user WHERE discord_id = @did
            """
        |> Sql.executeAsync (fun read -> read.int "id")
        |> Async.AwaitTask

    return List.isEmpty result |> not
}

let checkInviteAccepted (userId : uint64) = async {
    try
    let! result =
        connStr
        |> Sql.connect
        |> Sql.parameters [ "did" , Sql.string (string userId) ]
        |> Sql.query "SELECT accepted FROM invited_user WHERE discord_id = @did"
        |> Sql.executeRowAsync (fun read -> read.bool "accepted")
        |> Async.AwaitTask
    return result
    with ex ->
        printfn "%s %u" ex.Message userId
        return false
}

let private getInviteAttributions userId =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string userId) ]
    |> Sql.query """
            SELECT count(*) FROM invited_user
            JOIN invite ON invite.id = invited_user.invite_id
            WHERE invite.inviter = @did AND invited_user.accepted = true;
        """
    |> Sql.executeRowAsync (fun read -> read.int "count")
    |> Async.AwaitTask

let getInvitedUsers userId =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string userId) ]
    |> Sql.query """
            WITH invite AS (SELECT id FROM invite WHERE inviter = @did)
            SELECT discord_id FROM invited_user, invite
            WHERE invite.id = invited_user.invite_id AND invited_user.accepted = true
            ORDER BY invited_user.updated_at DESC, invited_user.created_at DESC LIMIT 10
        """
    |> Sql.executeAsync (fun read -> read.string "discord_id" |> uint64)
    |> Async.AwaitTask

let getInvitedUserCount userId =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string userId) ]
    |> Sql.query """
            WITH invite AS (SELECT id FROM invite WHERE inviter = @did)
            SELECT count(*) FROM invited_user, invite
            WHERE invite.id = invited_user.invite_id AND invited_user.accepted = true
        """
    |> Sql.executeRowAsync (fun read -> read.int "count")
    |> Async.AwaitTask

let addWalletAddress (userId : uint64) address =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string userId) ; "address" , Sql.string address ]
    |> Sql.query """
            UPDATE "user" SET wallet_address = @address WHERE id = @did;
        """
    |> Sql.executeNonQueryAsync
    |> Async.AwaitTask
    |> Async.Ignore

let getWalletAddress (userId : uint64) =
    connStr
    |> Sql.connect
    |> Sql.parameters [ "did" , Sql.string (string userId) ]
    |> Sql.query """
            SELECT wallet_address FROM "user" WHERE id = @did;
        """
    |> Sql.executeRowAsync (fun reader -> reader.stringOrNone "wallet_address")
    |> Async.AwaitTask

let private listServerInvites (ctx : IDiscordContext) = task {
    let! invites = ctx.GetGuild().GetInvitesAsync()
    let sb = StringBuilder()
    for invite in invites do
        sb.AppendLine($"{invite.Inviter.Username} - {invite.Code}") |> ignore
    let msg =
        DiscordInteractionResponseBuilder()
            .AsEphemeral(true)
            .WithContent("Server Invites\n" + sb.ToString())
    do! ctx.Respond(InteractionResponseType.ChannelMessageWithSource, msg)
}

let getAttributions userId (ctx : IDiscordContext) =
    task {
        let! total = getInviteAttributions(userId)
        let msg =
            DiscordInteractionResponseBuilder()
                .AsEphemeral(true)
                .WithContent($"<@{userId}> has invited {total} people")
        do! ctx.Respond(InteractionResponseType.ChannelMessageWithSource, msg)
    } :> Task

let getInvitedUsersForId (user : DiscordUser) (ctx : IDiscordContext) =
    task {
        do! Messaging.defer ctx
        let! users = getInvitedUsers user.Id
        let! total = getInvitedUserCount user.Id
        let sb = StringBuilder()
        let mutable count = 0
        for user in users do
            count <- count + 1
            sb.AppendLine($"{count}.) <@{user}>") |> ignore
        let msg =
            let str =
                if users.Length > 0 then
                    $"**Total Recruited:** `{total} Degenz`\n**Total Earned:** `{total * InviteRewardAmount} 💰$GBT`\n\n**Last 10 users recruited:**\n{sb}"
                else
                    $"You haven't recruited anyone yet, click the `{InviteLinkButtonText}` button to get your invite link and start recruiting!"
            DiscordFollowupMessageBuilder()
                .AsEphemeral(true)
                .WithContent(str)
        do! ctx.FollowUp(msg)
        let user = ctx.GetDiscordMember()
        do! Analytics.recruitedButton total user.Id user.Username (ctx.GetChannel())
    } :> Task

let clearInvites (ctx : IDiscordContext) = task {
    let! invites = ctx.GetGuild().GetInvitesAsync()
    do!
        invites
        |> Seq.map (fun invite -> invite.DeleteAsync() |> Async.AwaitTask)
        |> Async.Sequential
        |> Async.Ignore
}

// Discord doesn't have any way to tell you if the user came via an invite, the only way to tell is to compare the
// cached invites in the DB to the ones in the guild and see if any has been incremented
let private processNewUser (eventArgs : GuildMemberAddEventArgs) =
    task {
         let! guildInvites = eventArgs.Guild.GetInvitesAsync()
         let! cachedInvites = getInvites ()
         for invite in guildInvites do
             let result = cachedInvites.TryFind(invite.Code)
             match result with
             | Some (_,count) ->
                 if invite.Uses > count then
                     do! addInvitedUser eventArgs.Member.Id invite.Code invite.Uses |> Async.Ignore
                     do! Analytics.invitedUserEntered invite.Code invite.Inviter.Id eventArgs.Member.Id invite.Inviter.Username eventArgs.Member.Username
             | None -> ()
    } :> Task

let acceptInvite (guild : DiscordGuild) discordId memberName =
    task {
        match! checkInviteAccepted discordId with
        | false ->
            let! _ = markInvitedAccepted discordId |> Async.Ignore
            try
                let! invite = getInviteFromInvitedUser discordId
                let! player = DbService.tryFindPlayer invite.Inviter
                match player with
                | Some player ->
                    do! DbService.updatePlayerCurrency InviteRewardAmount player.DiscordId |> Async.Ignore
                    do! match GuildEnvironment.botClientRecruit with
                        | Some recruitBot -> async {
                            let builder = DiscordMessageBuilder()
                            builder.WithContent($"{memberName} was recruited and is now a Degen. <@{player.DiscordId}> just earned {InviteRewardAmount} 💰$GBT for their efforts!") |> ignore
                            let channel = guild.GetChannel(GuildEnvironment.channelEventsHackerBattle)
                            do! recruitBot.SendMessageAsync(channel, builder)
                                |> Async.AwaitTask
                                |> Async.Ignore
                         }
                        | None -> async.Return()
                    do! Analytics.invitedUserAccepted invite.Code player.DiscordId discordId player.Name memberName
                | None -> return ()
            with _ -> ()
        | true -> return ()
    } :> Task

let sendInitialEmbed (ctx : IDiscordContext)  =
    async {
        try
            let channel = ctx.GetGuild().GetChannel(GuildEnvironment.channelRecruitment)
            let rewardMsg = $"""
**__Win $2,000:__**
🙋 1 invite = 1 entry everyday*
🎟 $100 daily raffles till mint

**__How To Invite:__**
1️⃣ Click the green button below
2️⃣ Share your unique link with Degenz

**__Bonus__**
💰 Earn an extra 100 $GBT for every invite!

**Every invite increases your chances of winning*
"""
            let embed =
                DiscordEmbedBuilder()
                    .WithColor(DiscordColor.CornflowerBlue)
                    .WithDescription(rewardMsg)
                    .WithImageUrl("https://s8.gifyu.com/images/invite-banner-usdc.png")
                    .WithTitle("Invite Degenz")

            let builder = DiscordMessageBuilder().AddEmbed(embed)
            let btn1 = DiscordButtonComponent(ButtonStyle.Success, $"CreateGuildInvite", InviteLinkButtonText) :> DiscordComponent
            let btn2 = DiscordButtonComponent(ButtonStyle.Primary, $"ShowRecruited", $"Check My Recruits") :> DiscordComponent
            builder.AddComponents [| btn1 ; btn2 |] |> ignore

            do! GuildEnvironment.botClientRecruit.Value.SendMessageAsync(channel, builder)
                |> Async.AwaitTask
                |> Async.Ignore
        with e ->
            printfn $"Error trying to get channel Whitelist\n\n{e.Message}"
    } |> Async.RunSynchronously
    
let showWalletStatus (ctx : IDiscordContext) =
    PlayerInteractions.executePlayerAction ctx (fun player -> async {
        try
            match! getWalletAddress player.DiscordId with
            | Some address -> do! Messaging.sendFollowUpMessage ctx $"""
🚀  Mint Date: 31st May, 18:00 UTC
✅  Status: We have successfully received your wallet address: {address}"""
            | None -> do! Messaging.sendFollowUpMessage ctx "You have no submitted your wallet yet. Type `/submit`, paste your **Solana Wallet Address**, then press enter"
        with ex ->
            printfn $"{ex.Message}"
            do! Messaging.sendFollowUpMessage ctx "Something went wrong retrieving your wallet address"
    })

let sendSubmitEmbed (ctx : IDiscordContext) =
    async {
        try
            let channel = ctx.GetGuild().GetChannel(GuildEnvironment.channelSubmitWallet)
            let rewardMsg = $"Instructions for submitting wallet"
            let embed =
                DiscordEmbedBuilder()
                    .WithColor(DiscordColor.White)
                    .WithDescription(rewardMsg)
                    .WithImageUrl("https://s8.gifyu.com/images/whitelist-submit-banner22.png")
                    .WithTitle("Submit Wallet")

            let builder = DiscordMessageBuilder().AddEmbed(embed)
            let btn = DiscordButtonComponent(ButtonStyle.Success, "WalletStatus", "Check Status") :> DiscordComponent
            builder.AddComponents [| btn |] |> ignore

            do! GuildEnvironment.botClientRecruit.Value.SendMessageAsync(channel, builder)
                |> Async.AwaitTask
                |> Async.Ignore
        with e ->
            printfn $"Error trying to get channel Whitelist\n\n{e.Message}"
    } |> Async.RunSynchronously
    
let handleCreateInvite (ctx : IDiscordContext) =
    task {
        let builder = DiscordInteractionResponseBuilder().AsEphemeral(true)
        do! ctx.Respond(InteractionResponseType.DeferredChannelMessageWithSource, builder)

        let user = ctx.GetDiscordMember()

        let! code =
            task {
                let! invites = getInvitesFromUser user.Id
                match invites |> Map.toList with
                | [] ->
                    let ( result , channel ) = ctx.GetGuild().Channels.TryGetValue(GuildEnvironment.channelWelcome)
                    if result then
                        let! invite = channel.CreateInviteAsync(max_age = 259200, unique = true)

                        try do! createInvite (ctx.GetDiscordMember().Id) invite.Code |> Async.Ignore
                        with ex -> printfn "%A" ex.Message

                        return invite.Code
                    else
                        printfn "Error finding Welcome channel"
                        return ""
                | invite::_ ->
                    return invite |> fst
            }

        let msg =
            DiscordFollowupMessageBuilder()
                .WithContent($"https://discord.gg/{code}")
                .AsEphemeral(true)

        do! ctx.FollowUp(msg)
        do! Analytics.recruitLinkButton code user.Id user.Username (ctx.GetChannel())
    } :> Task
    
let handleMemberUpdated (client : DiscordClient) (event : GuildMemberUpdateEventArgs) =
    let addedRole (rolesBefore : DiscordRole seq) (rolesAfter : DiscordRole seq) =
        rolesAfter |> Seq.filter ((fun role -> rolesBefore |> Seq.exists (fun r -> role.Id = r.Id)) >> not)
    task {
        let symmetricDifference = addedRole event.RolesBefore event.RolesAfter |> Seq.toList
        match symmetricDifference with
        | [] -> ()
        | role::_ ->
            if role.Name = "Degen" then
                let (_,guild) = client.Guilds.TryGetValue(GuildEnvironment.guildId)
                do! acceptInvite guild event.Member.Id event.Member.Username |> Async.AwaitTask
        return ()
    } :> Task
    
let handleGuildMemberAdded _ (eventArgs : GuildMemberAddEventArgs) =
    task {
        let! exists = checkUserAlreadyInvited eventArgs.Member.Id
        if not exists then
            do! processNewUser eventArgs
    } :> Task

let submitWhitelist (ctx : IDiscordContext) (address : string) =
    task {
        // BtshZ7oNB5tk5pVbDpsRCziZ1qwV7SMCJq1Pe3YbHZuo
        let pubkey = PublicKey(address)
        if pubkey.IsValid() && pubkey.IsOnCurve() then
            do! addWalletAddress (ctx.GetDiscordMember().Id) address
            do! Messaging.sendSimpleResponse ctx "You provided a valid address"
        else
            do! Messaging.sendSimpleResponse ctx "This address is not valid"
        return ()
    } :> Task

type Inviter() =
    inherit ApplicationCommandModule ()

    [<SlashCommand("submit", "Submit your public wallet address")>]
    member this.SubmitAddress (ctx : InteractionContext, [<Option("address", "Wallet address")>] address : string) =
        submitWhitelist (DiscordInteractionContext ctx) address

//    [<SlashCommand("recruited", "Get total invites from a specific user")>]
//    member this.ListInvitedPeople (ctx : InteractionContext) =
//        let ictx = DiscordInteractionContext ctx :> IDiscordContext
//        getInvitedUsersForId (ictx.GetDiscordMember()) ictx

//    [<SlashCommand("invites-list", "List all the invites")>]
//    member this.ListServerInvites (ctx : InteractionContext) =
//        listServerInvites (DiscordInteractionContext ctx)

//    [<SlashCommand("invites-clear", "Get total invites from a specific user")>]
//    member this.ClearInvites (ctx : InteractionContext) =
//        clearInvites (DiscordInteractionContext ctx)