const {
    EmbedBuilder,
    ActionRowBuilder,
    ButtonBuilder,
    ButtonStyle
} = require("discord.js");

const {
    getCookieBalance,
    transferCookies,
    temporaryEphemeralReply,
    randomItem
} = require("./cookieEconomy");


/*
 * SLOT CONFIG
 */

const SLOT_BETS = [
    10,
    50,
    100,
    500,
    1000
];


const SLOT_SYMBOLS = [
    "🍒",
    "🍋",
    "🍪",
    "⭐",
    "💎"
];


/*
 * Weighted outcomes.
 */

const SLOT_OUTCOMES = [
    {
        weight: 300,
        type: "loss",
        multiplier: 0
    },

    {
        weight: 390,
        type: "pair",
        multiplier: 0.5
    },

    {
        weight: 150,
        type: "triple",
        symbol: "🍋",
        multiplier: 1.5
    },

    {
        weight: 80,
        type: "triple",
        symbol: "🍒",
        multiplier: 2
    },

    {
        weight: 45,
        type: "triple",
        symbol: "🍪",
        multiplier: 3
    },

    {
        weight: 25,
        type: "triple",
        symbol: "⭐",
        multiplier: 5
    },

    {
        weight: 10,
        type: "triple",
        symbol: "💎",
        multiplier: 10
    }
];


/*
 * ============================================================
 * MAIN MENU
 * ============================================================
 */

async function showCrumbSaucer(
    interaction
) {
    const balance =
        await getCookieBalance(
            interaction.user.id
        );


    const embed =
        buildMainMenuEmbed(
            interaction.user,
            balance
        );


    const components =
        buildMainMenuButtons();


    /*
     * Slash command:
     * reply normally.
     *
     * Button:
     * update existing menu message.
     */

    if (
        interaction.isButton()
    ) {
        return interaction.update({
            embeds: [
                embed
            ],

            components
        });
    }


    return interaction.reply({
        embeds: [
            embed
        ],

        components
    });
}


/*
 * ============================================================
 * SLOT MENU
 * ============================================================
 */

async function showSlots(
    interaction
) {
    const ownerId =
        getMenuOwner(
            interaction
        );


    if (
        ownerId !==
        interaction.user.id
    ) {
        return temporaryEphemeralReply(
            interaction,
            {
                content:
                    "This isn't your Crumb Saucer session. Open your own with `/crumbsaucer`."
            }
        );
    }


    const balance =
        await getCookieBalance(
            interaction.user.id
        );


    const embed =
        new EmbedBuilder()
            .setTitle(
                "🎰 Crumb Saucer Slots"
            )
            .setDescription(
                [
                    "Welcome to the Cookie reels.",
                    "",
                    "Choose your wager below.",
                    "",
                    "🍋 **Triple Lemon** — ×1.5",
                    "🍒 **Triple Cherry** — ×2",
                    "🍪 **Triple Cookie** — ×3",
                    "⭐ **Triple Star** — ×5",
                    "💎 **Jackpot** — ×10"
                ].join("\n")
            )
            .addFields({
                name:
                    "Your Vault",

                value:
                    `**${balance.toLocaleString()} 🍪**`
            })
            .setFooter({
                text:
                    `crumbSaucerSlots:${interaction.user.id}`
            });


    return interaction.update({
        embeds: [
            embed
        ],

        components:
            buildSlotBetButtons()
    });
}


/*
 * ============================================================
 * PLAY SLOTS
 * ============================================================
 */

async function playSlots(
    interaction,
    bet
) {
    const ownerId =
        getSlotsOwner(
            interaction
        );


    if (
        ownerId !==
        interaction.user.id
    ) {
        return temporaryEphemeralReply(
            interaction,
            {
                content:
                    "These aren't your slots. Open your own Crumb Saucer session."
            }
        );
    }


    if (
        !SLOT_BETS.includes(
            bet
        )
    ) {
        return temporaryEphemeralReply(
            interaction,
            {
                content:
                    "That wager isn't available."
            }
        );
    }


    const playerId =
        interaction.user.id;

    const vaultId =
        interaction.client.user.id;


    const [
        playerBalance,
        vaultBalance
    ] =
        await Promise.all([
            getCookieBalance(
                playerId
            ),

            getCookieBalance(
                vaultId
            )
        ]);


    if (
        playerBalance <
        bet
    ) {
        return temporaryEphemeralReply(
            interaction,
            {
                content:
                    `You need **${bet.toLocaleString()} Cookies** for that wager.`
            }
        );
    }


    /*
     * Worst-case payout is x10.
     *
     * Once the house receives the player's bet,
     * it needs another 9x available to cover
     * the complete x10 payout.
     */

    if (
        vaultBalance <
        bet * 9
    ) {
        return temporaryEphemeralReply(
            interaction,
            {
                content:
                    "The Crumb Saucer vault doesn't currently have enough Cookies to cover that wager."
            }
        );
    }


    /*
     * Take wager first.
     */

    try {
        await transferCookies(
            playerId,
            vaultId,
            bet
        );

    } catch (error) {
        if (
            error.message ===
            "INSUFFICIENT_COOKIES"
        ) {
            return temporaryEphemeralReply(
                interaction,
                {
                    content:
                        "Your Cookie balance changed before the spin could begin."
                }
            );
        }

        throw error;
    }


    /*
     * Lock the buttons while spinning.
     */

    await interaction.update({
        embeds: [
            buildSpinningEmbed(
                bet,
                generateRandomGrid(),
                "🎰 Spinning..."
            )
        ],

        components: []
    });


    /*
     * A few slow edits give a slot-machine feel
     * without hammering the Discord API.
     */

    await sleep(
        700
    );


    await interaction.editReply({
        embeds: [
            buildSpinningEmbed(
                bet,
                generateRandomGrid(),
                "🎰 The reels are moving..."
            )
        ],

        components: []
    });


    await sleep(
        700
    );


    await interaction.editReply({
        embeds: [
            buildSpinningEmbed(
                bet,
                generateRandomGrid(),
                "🎰 Almost..."
            )
        ],

        components: []
    });


    await sleep(
        700
    );


    /*
     * Actual outcome is determined only now.
     */

    const outcome =
        rollSlotOutcome();


    const grid =
        generateOutcomeGrid(
            outcome
        );


    const payout =
        Math.floor(
            bet *
            outcome.multiplier
        );


    /*
     * House pays winnings.
     *
     * The original stake was already transferred
     * to the house, so x2 means a total payout of 2x.
     */

    if (
        payout > 0
    ) {
        try {
            await transferCookies(
                vaultId,
                playerId,
                payout
            );

        } catch (error) {
            console.error(
                "CRITICAL: Crumb Saucer payout failed:",
                error
            );


            return interaction.editReply({
                embeds: [
                    new EmbedBuilder()
                        .setTitle(
                            "🎰 Crumb Saucer Error"
                        )
                        .setDescription(
                            "The reels stopped, but the payout system had a problem. Please contact an administrator."
                        )
                ],

                components:
                    buildResultButtons()
            });
        }
    }


    const [
        playerAfter,
        vaultAfter
    ] =
        await Promise.all([
            getCookieBalance(
                playerId
            ),

            getCookieBalance(
                vaultId
            )
        ]);


    const profit =
        payout -
        bet;


    const resultEmbed =
        new EmbedBuilder()
            .setTitle(
                "🎰 Crumb Saucer Slots"
            )
            .setDescription(
                [
                    buildSlotDisplay(
                        grid
                    ),
                    "",
                    `### ${getSlotResultName(outcome)}`
                ].join("\n")
            )
            .addFields(
                {
                    name:
                        "Bet",

                    value:
                        `${bet.toLocaleString()} 🍪`,

                    inline:
                        true
                },

                {
                    name:
                        "Multiplier",

                    value:
                        `×${outcome.multiplier}`,

                    inline:
                        true
                },

                {
                    name:
                        "Payout",

                    value:
                        `${payout.toLocaleString()} 🍪`,

                    inline:
                        true
                },

                {
                    name:
                        "Profit",

                    value:
                        `${profit >= 0 ? "+" : ""}${profit.toLocaleString()} 🍪`,

                    inline:
                        true
                },

                {
                    name:
                        "Your Vault",

                    value:
                        `${playerAfter.toLocaleString()} 🍪`,

                    inline:
                        true
                },

                {
                    name:
                        "House Vault",

                    value:
                        `${vaultAfter.toLocaleString()} 🍪`,

                    inline:
                        true
                }
            )
            .setFooter({
                text:
                    `crumbSaucerSlots:${interaction.user.id}`
            });


    return interaction.editReply({
        embeds: [
            resultEmbed
        ],

        components:
            buildResultButtons()
    });
}


/*
 * ============================================================
 * MAIN MENU EMBED
 * ============================================================
 */

function buildMainMenuEmbed(
    user,
    balance
) {
    return new EmbedBuilder()
        .setTitle(
            "🎰 The Crumb Saucer"
        )
        .setDescription(
            [
                `Welcome, ${user}!`,
                "",
                "Where Cookies are won, lost,",
                "and occasionally confiscated by ShaiBot.",
                "",
                "### 🎰 Slots",
                "Spin the reels and chase the Cookie jackpot.",
                "",
                "### 🏦 Vault Heist",
                "Attempt to breach ShaiBot's Cookie Vault.",
                "",
                "### 🃏 Blackjack",
                "Beat the dealer without going over 21.",
                "",
                "*More attractions coming soon...*"
            ].join("\n")
        )
        .addFields({
            name:
                "Your Vault",

            value:
                `**${balance.toLocaleString()} 🍪**`
        })
        .setFooter({
            text:
                `crumbSaucer:${user.id}`
        });
}


/*
 * ============================================================
 * BUTTONS
 * ============================================================
 */

function buildMainMenuButtons() {
    return [
        new ActionRowBuilder()
            .addComponents(
                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots"
                    )
                    .setLabel(
                        "Slots"
                    )
                    .setEmoji(
                        "🎰"
                    )
                    .setStyle(
                        ButtonStyle.Primary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerHeist"
                    )
                    .setLabel(
                        "Vault Heist"
                    )
                    .setEmoji(
                        "🏦"
                    )
                    .setStyle(
                        ButtonStyle.Danger
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerBlackjack"
                    )
                    .setLabel(
                        "Blackjack"
                    )
                    .setEmoji(
                        "🃏"
                    )
                    .setStyle(
                        ButtonStyle.Success
                    )
            )
    ];
}

function buildSlotBetButtons() {
    return [
        new ActionRowBuilder()
            .addComponents(
                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots10"
                    )
                    .setLabel(
                        "10"
                    )
                    .setEmoji(
                        "🍪"
                    )
                    .setStyle(
                        ButtonStyle.Secondary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots50"
                    )
                    .setLabel(
                        "50"
                    )
                    .setEmoji(
                        "🍪"
                    )
                    .setStyle(
                        ButtonStyle.Secondary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots100"
                    )
                    .setLabel(
                        "100"
                    )
                    .setEmoji(
                        "🍪"
                    )
                    .setStyle(
                        ButtonStyle.Primary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots500"
                    )
                    .setLabel(
                        "500"
                    )
                    .setEmoji(
                        "🍪"
                    )
                    .setStyle(
                        ButtonStyle.Primary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots1000"
                    )
                    .setLabel(
                        "1,000"
                    )
                    .setEmoji(
                        "🍪"
                    )
                    .setStyle(
                        ButtonStyle.Danger
                    )
            ),

        new ActionRowBuilder()
            .addComponents(
                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerBack"
                    )
                    .setLabel(
                        "Back to Crumb Saucer"
                    )
                    .setEmoji(
                        "◀️"
                    )
                    .setStyle(
                        ButtonStyle.Secondary
                    )
            )
    ];
}


function buildResultButtons() {
    return [
        new ActionRowBuilder()
            .addComponents(
                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerSlots"
                    )
                    .setLabel(
                        "Play Again"
                    )
                    .setEmoji(
                        "🎰"
                    )
                    .setStyle(
                        ButtonStyle.Primary
                    ),

                new ButtonBuilder()
                    .setCustomId(
                        "crumbSaucerBack"
                    )
                    .setLabel(
                        "Crumb Saucer"
                    )
                    .setEmoji(
                        "◀️"
                    )
                    .setStyle(
                        ButtonStyle.Secondary
                    )
            )
    ];
}


/*
 * ============================================================
 * SLOT LOGIC
 * ============================================================
 */

function rollSlotOutcome() {
    const totalWeight =
        SLOT_OUTCOMES.reduce(
            (
                total,
                outcome
            ) =>
                total +
                outcome.weight,

            0
        );


    let roll =
        Math.random() *
        totalWeight;


    for (
        const outcome
        of SLOT_OUTCOMES
    ) {
        roll -=
            outcome.weight;


        if (
            roll <= 0
        ) {
            return outcome;
        }
    }


    return SLOT_OUTCOMES[0];
}


function generateRandomGrid() {
    return Array.from(
        {
            length: 3
        },

        () =>
            Array.from(
                {
                    length: 3
                },

                () =>
                    randomItem(
                        SLOT_SYMBOLS
                    )
            )
    );
}


function generateOutcomeGrid(
    outcome
) {
    const grid =
        generateRandomGrid();


    /*
     * Winning middle row.
     */

    if (
        outcome.type ===
        "triple"
    ) {
        grid[1] = [
            outcome.symbol,
            outcome.symbol,
            outcome.symbol
        ];


        return grid;
    }


    /*
     * Pair.
     */

    if (
        outcome.type ===
        "pair"
    ) {
        const symbol =
            randomItem(
                SLOT_SYMBOLS
            );


        let other;


        do {
            other =
                randomItem(
                    SLOT_SYMBOLS
                );

        } while (
            other === symbol
        );


        /*
         * Randomize the location of the odd symbol.
         */

        const oddPosition =
            Math.floor(
                Math.random() *
                3
            );


        grid[1] = [
            symbol,
            symbol,
            symbol
        ];


        grid[1][
            oddPosition
        ] =
            other;


        return grid;
    }


    /*
     * Loss:
     * ensure all three center symbols differ.
     */

    let line;


    do {
        line = [
            randomItem(
                SLOT_SYMBOLS
            ),

            randomItem(
                SLOT_SYMBOLS
            ),

            randomItem(
                SLOT_SYMBOLS
            )
        ];

    } while (
        new Set(
            line
        ).size <
        3
    );


    grid[1] =
        line;


    return grid;
}


function buildSlotDisplay(
    grid
) {
    return [
        "╔═════════════╗",
        `║ ${grid[0][0]} │ ${grid[0][1]} │ ${grid[0][2]} ║`,
        `║ ${grid[1][0]} │ ${grid[1][1]} │ ${grid[1][2]} ║`,
        `║ ${grid[2][0]} │ ${grid[2][1]} │ ${grid[2][2]} ║`,
        "╚═════════════╝"
    ].join("\n");
}


function buildSpinningEmbed(
    bet,
    grid,
    status
) {
    return new EmbedBuilder()
        .setTitle(
            "🎰 Crumb Saucer Slots"
        )
        .setDescription(
            [
                buildSlotDisplay(
                    grid
                ),
                "",
                `**${status}**`
            ].join("\n")
        )
        .addFields({
            name:
                "Bet",

            value:
                `**${bet.toLocaleString()} 🍪**`
        });
}


function getSlotResultName(
    outcome
) {
    if (
        outcome.type ===
        "loss"
    ) {
        return "No luck this time.";
    }


    if (
        outcome.type ===
        "pair"
    ) {
        return "Pair!";
    }


    switch (
        outcome.symbol
    ) {
        case "🍋":
            return "🍋 Triple Lemon!";

        case "🍒":
            return "🍒 Triple Cherry!";

        case "🍪":
            return "🍪 Triple Cookie!";

        case "⭐":
            return "⭐ Triple Star!";

        case "💎":
            return "💎 JACKPOT! 💎";

        default:
            return "Winner!";
    }
}


/*
 * ============================================================
 * OWNER RESOLUTION
 * ============================================================
 */

function getMenuOwner(
    interaction
) {
    const footer =
        interaction.message
            .embeds[0]
            ?.footer
            ?.text;


    const [
        type,
        userId
    ] =
        footer
            ?.split(":")
        ??
        [];


    if (
        type !==
        "crumbSaucer"
    ) {
        return null;
    }


    return userId;
}


function getSlotsOwner(
    interaction
) {
    const footer =
        interaction.message
            .embeds[0]
            ?.footer
            ?.text;


    const [
        type,
        userId
    ] =
        footer
            ?.split(":")
        ??
        [];


    if (
        type !==
        "crumbSaucerSlots"
    ) {
        return null;
    }


    return userId;
}


function sleep(ms) {
    return new Promise(
        resolve =>
            setTimeout(
                resolve,
                ms
            )
    );
}


module.exports = {
    showCrumbSaucer,
    showSlots,
    playSlots
};