import Foundation
import FoundationNetworking
import DiscordBM

struct MessageHandler {
    let ctx: Gateway.MessageCreate
    let client: any DiscordClient

    static let prefix = ":"
    static let zundaGifData = try? Data(contentsOf: URL(filePath: "media/zundamone.gif"))

    func handle() async throws {
        guard !(ctx.author?.bot ?? false) else { return }
        if (ctx.content.hasPrefix(MessageHandler.prefix)) {
            let split = ctx.content.split(separator: " ")
            let command = split.first?.trimmingPrefix(MessageHandler.prefix)
            let args = split[1...]

            switch command {
                case "wow": try await handleWow(args)
                case "domath": try await Wolfram.handleMath(args, client: client, ctx: ctx)
                default: break
            }
        } else if ctx.mentions.contains(where: { $0.id == Zundamon.ownID }) {
            if ctx.content
                .replacingOccurrences(of: "<@\(Zundamon.ownID!.rawValue)>", with: "")
                .trimmingCharacters(in: .whitespacesAndNewlines)
                .count == 0,
                let zundaGif = MessageHandler.zundaGifData
            {
                try await client.createMessage(
                    channelId: ctx.channel_id,
                    payload: .init(
                        message_reference: .init(
                            type: .default,
                            message_id: ctx.id,
                            channel_id: ctx.channel_id,
                            guild_id: ctx.guild_id,
                        ),
                        files: [.init(data: .init(data: zundaGif), filename: "zundamone.gif")],
                        attachments: [.init(index: 0, filename: "zundamone.gif")],
                    )
                ).guardSuccess()
            } else {
                try await handle8Ball()
            }
        }
    }

    static let ballResponses = [
        "It is certain.",
        "It is decidedly so.",
        "Without a doubt.",
        "Yes – definitely.",
        "You may rely on it.",
        "As I see it, yes.",
        "Most likely.",
        "Outlook good.",
        "Yes.",
        "Signs point to yes.",
        "Reply hazy, try again.",
        "Ask again later.",
        "Better not tell you now.",
        "Cannot predict now.",
        "Concentrate and ask again.",
        "Don’t count on it.",
        "My reply is no.",
        "My sources say no.",
        "Outlook not so good.",
        "Very doubtful.",
        "Ui beam",
        "We are Shigure Ui",
        "We are Shigure Ux",
    ]
    func handle8Ball() async throws {
        try await client.createMessage(
            channelId: ctx.channel_id,
            payload: .init(
                content: MessageHandler.ballResponses.randomElement(),
                message_reference: .init(
                    type: .default,
                    message_id: ctx.id,
                    channel_id: ctx.channel_id,
                    guild_id: ctx.guild_id,
                ),
            )
        ).guardSuccess()
    }

    static let wows = [
        "<:wow:1477062414913634334>",
        "<:wow2:1477062432357875948>",
        "<:wow4:1477062471746588713>",
        "<:wow5:1477062452804849845>"
    ]
    func handleWow(_ args: ArraySlice<String.SubSequence>) async throws {
        try await client.createMessage(
            channelId: ctx.channel_id,
            payload: .init(
                content: MessageHandler.wows.randomElement(),
                message_reference: .init(
                    type: .default,
                    message_id: ctx.id,
                    channel_id: ctx.channel_id,
                    guild_id: ctx.guild_id,
                ),
            )
        ).guardSuccess()
    }

}