module Degenz.Store

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

let handleResultWithResponse ctx fn (player : Result<PlayerData, string>) =
   match player with
   | Ok p -> fn p
   | Error e -> async { do! sendFollowUpMessageFromCtx ctx e }

let handleResultWithResponseFromEvent event fn (player : Result<PlayerData, string>) =
   match player with
   | Ok p -> fn p
   | Error e -> async { do! sendFollowUpMessage event e }

let checkHasSufficientFunds (item : BattleItem) player =
    if player.Bank - item.Cost >= 0<GBT>
       then Ok player
       else Error $"You do not have sufficient funds to buy this item! Current balance: {player.Bank} GBT"

let checkAlreadyOwnsItem (item : BattleItem) player =
    if player.Arsenal |> Array.exists (fun w -> item.Id = w.Id)
        then Error $"You already own {item.Name}!"
        else Ok player

let checkSoldItemAlready (item : BattleItem) player =
    if player.Arsenal |> Array.exists (fun w -> item.Id = w.Id)
        then Ok player
        else Error $"{item.Name} not found in your arsenal! Looks like you sold it already."

let checkHasItemsInArsenal itemType player =
    if player.Arsenal |> Array.filter (fun i -> i.Type = itemType ) |> Array.length > 0
        then Ok player
        else Error $"You currently have no {itemType}s in your arsenal to sell!"

let statusFormat p =
    $"**Hacks:** {Player.hacks p |> battleItemFormat}\n
**Shields:** {Player.shields p |> battleItemFormat}\n
**Hack Attacks:**\n{Player.attacks p |> actionFormat}\n
**Active Shields:**\n{Player.defenses p |> actionFormat}"

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

let buy itemType (ctx : InteractionContext) =
    Game.executePlayerInteraction ctx (fun player -> async {
        let itemStore = Embeds.getBuyItemsEmbed player itemType Armory.battleItems
        do! ctx.Interaction.CreateFollowupMessageAsync(itemStore)
            |> Async.AwaitTask
            |> Async.Ignore
    })

let sell itemType (ctx : InteractionContext) =
    Game.executePlayerInteraction ctx (fun player -> async {
        match checkHasItemsInArsenal itemType player with
        | Ok _ ->
            let itemStore = Embeds.getSellItemsEmbed itemType player

            do! ctx.FollowUpAsync(itemStore)
                |> Async.AwaitTask
                |> Async.Ignore
        | Error e -> do! sendFollowUpMessageFromCtx ctx e
    })

// TODO: When you buy a shield, prompt the user to activate it
let handleBuyItem (event : ComponentInteractionCreateEventArgs) itemId =
    Game.executePlayerEvent event (fun player -> async {
        let item = Armory.battleItems |> Array.find (fun w -> w.Id = itemId)
        do! player
            |> checkHasSufficientFunds item
            >>= checkAlreadyOwnsItem item
            |> handleResultWithResponseFromEvent event (fun player -> async {
                let newBalance = player.Bank - item.Cost
                let p = { player with Bank = newBalance ; Arsenal = Array.append [| item |] player.Arsenal }
                do! DbService.updatePlayer p
                do! sendFollowUpMessage event $"Successfully purchased {item.Name}! You now have {newBalance} 💰$GBT remaining"
            })
    })

let handleSell (event : ComponentInteractionCreateEventArgs) itemId =
    Game.executePlayerEvent event (fun player -> async {
        let item = Armory.getItem itemId
        do! player
            |> checkSoldItemAlready item
            |> handleResultWithResponseFromEvent event (fun player -> async {
                let updatedPlayer = {
                    player with
                        Bank = player.Bank + item.Cost
                        Arsenal = player.Arsenal |> Array.filter (fun i -> i.Id <> itemId)
                        Actions =
                            if item.Type = ItemType.Shield
                                then player.Actions |> Array.filter (fun a -> a.ActionId <> itemId)
                                else player.Actions
                }
                do! DbService.updatePlayer updatedPlayer
                do! sendFollowUpMessage event $"Sold {item.Type} {item.Name} for {item.Cost}! Current Balance: {updatedPlayer.Bank}"
            })
    })

let handleStoreEvents (_ : DiscordClient) (event : ComponentInteractionCreateEventArgs) =
    let itemId = int <| event.Id.Split("-").[1]
    match event.Id with
    | id when id.StartsWith("Buy") -> handleBuyItem event itemId
    | id when id.StartsWith("Sell") -> handleSell event itemId
    | _ ->
        task {
            let builder = DiscordInteractionResponseBuilder()
            builder.IsEphemeral <- true
            builder.Content <- $"Incorrect Action identifier {event.Id}"
            do! event.Interaction.CreateResponseAsync(InteractionResponseType.ChannelMessageWithSource, builder)
                |> Async.AwaitTask
        }

type Store() =
    inherit ApplicationCommandModule ()

    let enforceChannel (ctx : InteractionContext) (storeFn : InteractionContext -> Task) =
        match ctx.Channel.Id with
        | id when id = GuildEnvironment.channelArmory -> storeFn ctx
        | _ ->
            task {
                let msg = $"You must go to <#{GuildEnvironment.channelArmory}> channel to buy/sell 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) = arsenal ctx

    [<SlashCommand("buy-hack", "Purchase a hack attack you can use to earn GoodBoyTokenz")>]
    member _.BuyHack (ctx : InteractionContext) = enforceChannel ctx (buy ItemType.Hack)

    [<SlashCommand("buy-shield", "Purchase a hack shield so you can protect your GoodBoyTokenz")>]
    member this.BuyShield (ctx : InteractionContext) = enforceChannel ctx (buy ItemType.Shield)

    [<SlashCommand("sell-hack", "Sell a hack for GoodBoyTokenz")>]
    member this.SellHack (ctx : InteractionContext) = enforceChannel ctx (sell ItemType.Hack)

    [<SlashCommand("sell-shield", "Sell a shield for GoodBoyTokenz")>]
    member this.SellShield (ctx : InteractionContext) = enforceChannel ctx (sell ItemType.Shield)