module Degenz.HackerBattle

open System
open System.Threading.Tasks
open DSharpPlus
open DSharpPlus.Entities
open DSharpPlus.EventArgs
open DSharpPlus.SlashCommands
open Degenz
open Degenz.Messaging

let checkPlayerIsAttackingThemselves defender attacker =
    match attacker.DiscordId = defender.DiscordId with
    | true -> Error "You think you're clever? You can't hack yourself, pal."
    | false -> Ok attacker

let checkAlreadyHackedTarget defender attacker =
    defender.Events
    |> Array.tryFind (fun event -> event.Adversary.Id = attacker.DiscordId && event.IsInstigator = false)
    |> function
       | Some event ->
           let cooldown = getTimeText true Game.SameTargetAttackCooldown event.Timestamp
           Error $"You can only hack the same target once every {Game.SameTargetAttackCooldown.Hours} hours, wait {cooldown} to attempt another hack on <@{defender.DiscordId}>."
       | None -> Ok attacker

let checkWeaponHasCooldown (weapon : Item) attacker =
    let cooldown = attacker.Events |> Array.tryFind (fun a -> a.ItemId = weapon.Id)
    match cooldown with
    | Some event ->
       let cooldown = getTimeText true (TimeSpan.FromMinutes(int event.Cooldown)) event.Timestamp
       Error $"{weapon.Name} is still active, it will expire in {cooldown}."
    | None -> Ok attacker

let checkHasEmptyHacks attacker =
    match Player.getHacks attacker with
    | [||] -> Error $"You currently do not have any Hacks to take 💰$GBT from others. Please go to the <#{GuildEnvironment.channelArmory}> and purchase one."
    | _ -> Ok attacker

let checkPlayerOwnsWeapon (item : Item) player =
    match player.Inventory |> Array.exists (fun i -> i.Id = item.Id) with
    | true -> Ok player
    | false -> Error $"You sold your weapon already, you cheeky bastard..."

let checkPlayerHasShieldSlotsAvailable (shield : Item) player =
    let updatedPlayer = player |> Player.removeExpiredActions
    let defenses = Player.getShieldEvents updatedPlayer
    match defenses |> Array.length >= 3 with
    | true ->
        let timestamp = defenses |> Array.rev |> Array.head |> fun a -> a.Timestamp // This should be the next expiring timestamp
        let cooldown = getTimeText true (TimeSpan.FromMinutes(int shield.Cooldown)) timestamp
        Error $"You are only allowed three shields at a time. Wait {cooldown} to add another shield"
    | false -> Ok updatedPlayer

let calculateDamage (hack : Item) (shield : Item) =
    if hack.Class = shield.Class
        then Weak
        else Strong

let runHackerBattle defender hack =
    defender
    |> Player.removeExpiredActions
    |> Player.getShieldEvents
    |> Array.map (fun dfn -> Armory.battleItems |> Array.find (fun w -> w.Id = dfn.ItemId))
    |> Array.map (calculateDamage (hack))
    |> Array.contains Weak

let updateCombatants successfulHack (attacker : PlayerData) (defender : PlayerData) (hack : Item) prize =
    let updatePlayer amount attack p =
       { p with Events = Array.append [| attack |] p.Events ; Bank = max (p.Bank + amount) 0<GBT> }
    let event isDefenderEvent = {
        ItemId = hack.Id
        Type = PlayerEventType.Hacking
        Adversary = if isDefenderEvent then attacker.basicPlayer else defender.basicPlayer
        Cooldown  = if isDefenderEvent then Game.SameTargetAttackCooldown.Minutes * 1<mins> else hack.Cooldown
        Timestamp = DateTime.UtcNow
        IsInstigator = not isDefenderEvent
        Result =
            match successfulHack , isDefenderEvent with
            | true  , true  -> PlayerEventResult.Negative
            | false , true  -> PlayerEventResult.Positive
            | true  , false -> PlayerEventResult.Positive
            | false , false -> PlayerEventResult.Negative
    }

    [ DbService.updatePlayer GuildEnvironment.pgDb <| updatePlayer  prize (event false) attacker
      DbService.updatePlayer GuildEnvironment.pgDb <| updatePlayer -prize (event true)  defender ]
    |> Async.Parallel
    |> Async.Ignore

let successfulHack (ctx : IDiscordContext) attacker defender hack =
    async {
        let finalAmount = max 0 (int defender.Bank - hack.Power) * 1<GBT>
        do! updateCombatants true attacker defender hack finalAmount

        let embed = Embeds.responseSuccessfulHack true defender.DiscordId finalAmount hack
        do! ctx.FollowUp embed |> Async.AwaitTask

        let builder = Embeds.eventSuccessfulHack ctx defender finalAmount
        let channel = ctx.GetGuild().GetChannel(GuildEnvironment.channelEventsHackerBattle)
        do! channel.SendMessageAsync(builder)
            |> Async.AwaitTask
            |> Async.Ignore
    }

let failedHack (ctx : IDiscordContext) attacker defender hack =
    async {
        let finalAmount = max 0 (int defender.Bank - hack.Power) * 1<GBT>
        let msg = $"Hack failed! {defender.Name} was able to mount a successful defense! You lost {finalAmount} $GBT!"
        do! sendFollowUpMessage ctx msg

        do! updateCombatants false attacker defender hack -finalAmount

        let builder = DiscordMessageBuilder()
        builder.WithContent($"Hacking attempt failed! <@{defender.DiscordId}> defended hack from {ctx.GetDiscordMember().Username} and took {finalAmount} $GBT from them! ") |> ignore
        let channel = (ctx.GetGuild().GetChannel(GuildEnvironment.channelEventsHackerBattle))
        do! channel.SendMessageAsync(builder)
            |> Async.AwaitTask
            |> Async.Ignore
    }

let hack (target : DiscordUser) (ctx : IDiscordContext) =
    Game.executePlayerActionWithTarget target ctx (fun attacker defender -> async {
      do! attacker
          |> Player.removeExpiredActions
          |> checkAlreadyHackedTarget defender
          >>= checkHasEmptyHacks
          >>= checkPlayerIsAttackingThemselves defender
          |> function
             | Ok atkr ->
                 let embed = Embeds.pickHack "Attack" atkr defender false
                 ctx.FollowUp(embed) |> Async.AwaitTask
             | Error msg -> sendFollowUpMessage ctx msg
    })

let handleAttack (ctx : IDiscordContext) =
    Game.executePlayerAction ctx (fun attacker -> async {
        let tokens = ctx.GetInteractionId().Split("-")
        let hackId = int tokens.[1]
        let hack = Armory.getItem hackId
        let resultId , targetId = UInt64.TryParse tokens.[2]
        let! resultTarget = DbService.tryFindPlayer GuildEnvironment.pgDb targetId

        match resultTarget , true , resultId with
        | Some defender , true , true ->
            do! attacker
                |> Player.removeExpiredActions
                |> checkAlreadyHackedTarget defender
                >>= checkPlayerOwnsWeapon hack
                >>= checkWeaponHasCooldown hack
                |> function
                   | Ok atkr ->
                       runHackerBattle defender hack
                       |> function
                          | false -> successfulHack ctx atkr defender hack
                          | true -> failedHack ctx attacker defender hack
                   | Error msg -> Messaging.sendFollowUpMessage ctx msg
        | _ -> do! Messaging.sendFollowUpMessage ctx "Error occurred processing attack"
    })

let defend (ctx : IDiscordContext) =
    Game.executePlayerAction ctx (fun player -> async {
        if Player.getShields player |> Array.length > 0 then
            let p = Player.removeExpiredActions player
            let embed = Embeds.pickDefense "Defend" p false
            do! ctx.FollowUp embed |> Async.AwaitTask
        else
            let msg = $"You currently do not have any Shields to protect yourself from hacks. Please go to the <#{GuildEnvironment.channelArmory}> and purchase one."
            do! Messaging.sendFollowUpMessage ctx msg
    })

let handleDefense (ctx : IDiscordContext) =
    Game.executePlayerAction ctx (fun player -> async {
        let tokens = ctx.GetInteractionId().Split("-")
        let shieldId = int tokens.[1]
        let shield = Armory.getItem shieldId

        do! player
            |> checkPlayerOwnsWeapon shield
            >>= checkPlayerHasShieldSlotsAvailable shield
            >>= checkWeaponHasCooldown shield
            |> handleResultWithResponse ctx (fun p -> async {
                let embed = Embeds.responseCreatedShield shield
                do! ctx.FollowUp embed |> Async.AwaitTask
                let defense = {
                    ItemId = shieldId
                    Type = PlayerEventType.Shielding
                    Result = PlayerEventResult.Positive
                    Timestamp = DateTime.UtcNow
                    Cooldown = shield.Cooldown
                    IsInstigator = true
                    Adversary = DiscordPlayer.empty
                }
                do! DbService.updatePlayer GuildEnvironment.pgDb <| { p with Events = Array.append [| defense |] p.Events  }
                    |> Async.Ignore
                let builder = DiscordMessageBuilder()
                builder.WithContent($"{ctx.GetDiscordMember().Username} has protected their system!") |> ignore
                let channel = ctx.GetGuild().GetChannel(GuildEnvironment.channelEventsHackerBattle)
                do! channel.SendMessageAsync(builder)
                    |> Async.AwaitTask
                    |> Async.Ignore
            })
    })

let arsenal (ctx : IDiscordContext) =
    Game.executePlayerAction ctx (fun player -> async {
        let updatedPlayer = Player.removeExpiredActions player
        let builder = DiscordFollowupMessageBuilder()
        let embed = DiscordEmbedBuilder()
        embed.AddField("Arsenal", Arsenal.statusFormat updatedPlayer) |> ignore
        builder.AddEmbed(embed) |> ignore
        builder.IsEphemeral <- true
        do! ctx.FollowUp(builder) |> Async.AwaitTask
        do! DbService.updatePlayer GuildEnvironment.pgDb updatedPlayer
            |> Async.Ignore
    })

let handleButtonEvent (_ : DiscordClient) (event : ComponentInteractionCreateEventArgs) =
    let eventCtx = DiscordEventContext event :> IDiscordContext
    match event.Id with
    | id when id.StartsWith("Attack")  -> handleAttack eventCtx
    | id when id.StartsWith("Defend")  -> handleDefense eventCtx
    | id when id.StartsWith("Trainer") -> Trainer.handleButtonEvent eventCtx |> Async.StartAsTask :> Task
    | id when id.StartsWith("Steal")   -> Thief.handleSteal eventCtx
    | id when id.StartsWith("RPS")     -> RockPaperScissors.handleRPS eventCtx
    | _ ->
        task {
            let builder = DiscordInteractionResponseBuilder()
            builder.IsEphemeral <- true
            builder.Content <- $"Incorrect Action identifier {eventCtx.GetInteractionId()}"
            do! eventCtx.Respond(InteractionResponseType.ChannelMessageWithSource, builder) |> Async.AwaitTask
        }

type HackerGame() =
    inherit ApplicationCommandModule ()

    let enforceChannels (ctx : IDiscordContext) (trainerFn : IDiscordContext -> Task) (battleFn : IDiscordContext -> Task) =
        match ctx.GetChannel().Id with
        | id when id = GuildEnvironment.channelTraining ->
            let hasTraineeRole = Seq.exists (fun (r : DiscordRole) -> r.Id = GuildEnvironment.roleTrainee) (ctx.GetDiscordMember().Roles)
            if hasTraineeRole then
                trainerFn ctx
            else
                task {
                    let msg = $"You're currently not in training, either go to <#{GuildEnvironment.channelBattle}> to hack for real, "
                             + "or restart training by clicking on the Pinned embed's button up top."
                    do! Messaging.sendSimpleResponse ctx msg
                }
        | id when id = GuildEnvironment.channelBattle ->
            battleFn ctx
        | _ ->
            task {
                let msg = $"You must go to <#{GuildEnvironment.channelBattle}> channel to hack, shield, or check your arsenal"
                do! Messaging.sendSimpleResponse ctx msg
            }

    [<SlashCommand("arsenal", "Get the Hacks and Shields you own, and which ones are active")>]
    member this.Arsenal (ctx : InteractionContext) =
        enforceChannels (DiscordInteractionContext ctx) (Trainer.handleArsenal) arsenal

    [<SlashCommand("hack", "Send a hack attack to another player")>]
    member this.AttackCommand (ctx : InteractionContext, [<Option("target", "The player you want to hack")>] target : DiscordUser) =
        enforceChannels (DiscordInteractionContext ctx) (Trainer.hack target) (hack target)

    [<SlashCommand("shield", "Create a passive shield that will protect you for a certain time")>]
    member this.ShieldCommand (ctx : InteractionContext) =
        enforceChannels (DiscordInteractionContext ctx) Trainer.defend defend

//    [<SlashCommand("test-autocomplete", "Create a passive defense that will last 24 hours")>]
    member this.TestAutoComplete (ctx : InteractionContext) =
        async {
            let builder = DiscordInteractionResponseBuilder()
            builder.IsEphemeral <- true
            do! ctx.Interaction.CreateResponseAsync(InteractionResponseType.ChannelMessageWithSource, builder)
                |> Async.AwaitTask
        } |> Async.StartAsTask
          :> Task