import {
    EmbedBuilder,
    AttachmentBuilder,
    ContainerBuilder,
    SectionBuilder,
    TextDisplayBuilder,
    MediaGalleryBuilder,
    MediaGalleryItemBuilder,
    ThumbnailBuilder,
    SeparatorBuilder,
    SeparatorSpacingSize,
    MessageFlags,
} from "discord.js";
import { resolveAssetUrl, isLocalAssetUrl } from "@shared/lib/assets";
import { getRarityConfig, defaultName } from "@shared/lib/rarity";
import { join } from "path";
import { existsSync } from "fs";

/**
 * Inventory entry with item details
 */
interface InventoryEntry {
    quantity: bigint | null;
    item: {
        id: number;
        name: string;
        [key: string]: any;
    };
}

/**
 * Creates an embed displaying a user's inventory
 */
export function getInventoryEmbed(items: InventoryEntry[], username: string): EmbedBuilder {
    const description = items.map(entry => {
        return `**${entry.item.name}** x${entry.quantity}`;
    }).join("\n");

    return new EmbedBuilder()
        .setTitle(`📦 ${username}'s Inventory`)
        .setDescription(description)
        .setColor(0x3498db); // Blue
}

/**
 * Creates a Components V2 message showing the result of opening a lootbox.
 * Falls back to a simple embed for non-lootbox item usage.
 */
export function getLootboxResultMessage(
    results: any[],
    item?: { name: string; iconUrl: string | null; imageUrl: string | null; usageData: any }
) {
    const files: AttachmentBuilder[] = [];
    const otherMessages: string[] = [];
    let lootResult: any = null;

    for (const res of results) {
        if (typeof res === "object" && res.type === "LOOTBOX_RESULT") {
            lootResult = res;
        } else {
            otherMessages.push(typeof res === "string" ? `• ${res}` : `• ${JSON.stringify(res)}`);
        }
    }

    // If no loot result, fall back to a simple embed (non-lootbox item usage)
    if (!lootResult) {
        const embed = new EmbedBuilder()
            .setTitle(item ? `✅ Used ${item.name}` : "✅ Item Used!")
            .setDescription(otherMessages.join("\n") || "Effect applied.")
            .setColor(0x2ecc71)
            .setTimestamp();
        return { embeds: [embed], files, components: undefined, flags: undefined };
    }

    // Determine rarity key for theming
    let rarityKey = "C";
    if (lootResult.rewardType === "ITEM" && lootResult.item) {
        rarityKey = lootResult.item.rarity || "C";
    } else if (lootResult.rewardType === "CURRENCY") {
        rarityKey = "CURRENCY";
    } else if (lootResult.rewardType === "XP") {
        rarityKey = "XP";
    } else {
        rarityKey = "NOTHING";
    }

    const config = getRarityConfig(rarityKey);
    const container = new ContainerBuilder().setAccentColor(config.color);

    // Header: lootbox name
    if (item?.name) {
        container.addTextDisplayComponents(
            new TextDisplayBuilder().setContent(`-# Opened: ${item.name}`)
        );
    }

    // Build title and description based on reward type
    let title = "";
    let description = "";

    if (lootResult.rewardType === "ITEM" && lootResult.item) {
        const i = lootResult.item;
        const amountStr = lootResult.amount > 1 ? ` ×${lootResult.amount}` : "";
        title = `${config.emoji} ${config.label} — ${i.name}${amountStr}`;
        description = i.description || "";
        description += (description ? "\n\n" : "") + `**${config.label}** · ×${lootResult.amount || 1} added to inventory`;
    } else if (lootResult.rewardType === "CURRENCY") {
        title = `${config.emoji} You found ${lootResult.amount.toLocaleString()} AU!`;
        description = "Coins have been added to your balance.";
    } else if (lootResult.rewardType === "XP") {
        title = `${config.emoji} You gained ${lootResult.amount.toLocaleString()} XP!`;
        description = "Experience has been added to your profile.";
    } else {
        title = `${config.emoji} Empty...`;
        description = lootResult.message || "You found nothing inside.";
    }

    // Main section with optional thumbnail
    const section = new SectionBuilder().addTextDisplayComponents(
        new TextDisplayBuilder().setContent(`# ${title}`),
        new TextDisplayBuilder().setContent(description)
    );

    // Thumbnail from iconUrl (use reward item's icon for ITEM, lootbox icon otherwise)
    let thumbnailUrl: string | null = null;
    const iconSource = lootResult.rewardType === "ITEM" ? lootResult.item?.iconUrl : item?.iconUrl;
    if (iconSource) {
        if (isLocalAssetUrl(iconSource)) {
            const iconPath = join(process.cwd(), "bot/assets/graphics", iconSource.replace(/^\/?assets\//, ""));
            if (existsSync(iconPath)) {
                const iconName = defaultName(iconSource);
                files.push(new AttachmentBuilder(iconPath, { name: iconName }));
                thumbnailUrl = `attachment://${iconName}`;
            }
        } else {
            thumbnailUrl = resolveAssetUrl(iconSource);
        }
    }

    if (thumbnailUrl) {
        section.setThumbnailAccessory(new ThumbnailBuilder().setURL(thumbnailUrl));
    }

    container.addSectionComponents(section);

    // Media gallery for full item art (if imageUrl differs from iconUrl)
    if (lootResult.rewardType === "ITEM" && lootResult.item) {
        const imgSource = lootResult.item.imageUrl;
        const iconSrc = lootResult.item.iconUrl;
        if (imgSource && imgSource !== iconSrc) {
            let displayImageUrl: string | null = null;
            if (isLocalAssetUrl(imgSource)) {
                const imagePath = join(process.cwd(), "bot/assets/graphics", imgSource.replace(/^\/?assets\//, ""));
                if (existsSync(imagePath)) {
                    const imageName = defaultName(imgSource);
                    if (!files.find(f => f.name === imageName)) {
                        files.push(new AttachmentBuilder(imagePath, { name: imageName }));
                    }
                    displayImageUrl = `attachment://${imageName}`;
                }
            } else {
                displayImageUrl = resolveAssetUrl(imgSource);
            }
            if (displayImageUrl) {
                container.addMediaGalleryComponents(
                    new MediaGalleryBuilder().addItems(
                        new MediaGalleryItemBuilder().setURL(displayImageUrl)
                    )
                );
            }
        }
    }

    // Other effects (non-lootbox results like temp roles, XP boosts)
    if (otherMessages.length > 0) {
        container.addSeparatorComponents(new SeparatorBuilder().setSpacing(SeparatorSpacingSize.Small));
        container.addTextDisplayComponents(
            new TextDisplayBuilder().setContent(`**Other Effects**\n${otherMessages.join("\n")}`)
        );
    }

    return {
        // TODO: remove cast once discord.js types include ContainerBuilder in MessageEditOptions
        components: [container] as any,
        files,
        flags: MessageFlags.IsComponentsV2,
        embeds: undefined,
    };
}