import { db, tickets } from "@/database";
import { getTicketByNumericId } from "@/database/queries";
import { hasManagerPermissions } from "@/utils/discord/permissions";
import { loggers } from "@/utils/logging";
import { generateTranscript } from "@/utils/tickets/transcripts";
import {
	ActionRowBuilder,
	ButtonBuilder,
	type ButtonInteraction,
	ButtonStyle,
	type ChatInputCommandInteraction,
	type Client,
	ContainerBuilder,
	type GuildMember,
	SeparatorBuilder,
	TextDisplayBuilder,
} from "discord.js";
import { eq } from "drizzle-orm";
import { PAGINATION_SIZE, getTicketContainer } from "./_shared";

const logger = loggers.interactions.child({ name: "ticket/gdpr" });

async function buildListContainerForUser(userId: string, page = 1) {
	const ticketsRes = await db
		.select()
		.from(tickets)
		.where(eq(tickets.authorId, userId));

	if (!ticketsRes || ticketsRes.length === 0) {
		const empty = new ContainerBuilder()
			.setAccentColor(0xff5a00)
			.addTextDisplayComponents(
				new TextDisplayBuilder().setContent(
					"## Your Tickets\n\nYou have no tickets.",
				),
			);
		return { container: empty, totalPages: 0, page: 1, total: 0 };
	}

	const sortedTickets = ticketsRes.sort((a, b) => {
		const dateA = a.closedAt ?? a.createdAt;
		const dateB = b.closedAt ?? b.createdAt;
		return dateB.getTime() - dateA.getTime();
	});

	const total = sortedTickets.length;
	const totalPages = Math.max(1, Math.ceil(total / PAGINATION_SIZE));
	const currentPage = Math.min(Math.max(1, page), totalPages);

	const paged = sortedTickets.slice(
		(currentPage - 1) * PAGINATION_SIZE,
		currentPage * PAGINATION_SIZE,
	);

	const tsExact = (d: string | Date) => {
		const date = new Date(d);
		return `<t:${Math.floor(date.getTime() / 1000)}:f>`;
	};
	const tsRelative = (d: string | Date) => {
		const date = new Date(d);
		return `<t:${Math.floor(date.getTime() / 1000)}:R>`;
	};

	const ticketLines = paged.map((t) => {
		let id = `**#${t.anonymousId}**`;
		if (t.closedAt) id = `~~**${id}**~~ (closed)`;

		const created = `${tsExact(t.createdAt)} (${tsRelative(t.createdAt)})`;
		const closed = t.closedAt
			? `\n  * opened ${tsExact(t.closedAt)} (${tsRelative(t.closedAt)})`
			: "";
		return `- ${id}\n  * created ${created}${closed}`;
	});

	const header = `## Your Tickets - ${total} total\n`;

	const container = new ContainerBuilder()
		.setAccentColor(0xff5a00)
		.addTextDisplayComponents(
			new TextDisplayBuilder().setContent(`${header}${ticketLines.join("\n")}`),
		)
		.addSeparatorComponents(
			new SeparatorBuilder().setDivider(false).setSpacing(1),
		);

	const controls = new ActionRowBuilder<ButtonBuilder>().addComponents(
		new ButtonBuilder()
			.setDisabled(true)
			.setLabel(`Page ${currentPage} of ${totalPages}`)
			.setStyle(ButtonStyle.Secondary)
			.setCustomId("ticket:list:page_info"),
		new ButtonBuilder()
			.setCustomId(`ticket:list:page:${Math.max(1, currentPage - 1)}`)
			.setLabel("Prev")
			.setStyle(ButtonStyle.Primary)
			.setDisabled(currentPage <= 1),
		new ButtonBuilder()
			.setCustomId(`ticket:list:page:${Math.min(totalPages, currentPage + 1)}`)
			.setLabel("Next")
			.setStyle(ButtonStyle.Primary)
			.setDisabled(currentPage >= totalPages),
	);

	const nextPage = Math.min(currentPage + 1, totalPages);
	const prevPage = Math.max(currentPage - 1, 1);
	if (nextPage !== prevPage) container.addActionRowComponents(controls);

	return { container, totalPages, page: currentPage, total };
}

export async function handleListPagination(
	_client: Client,
	interaction: ButtonInteraction,
) {
	const parts = interaction.customId.split(":");
	const pagePart = parts[3];
	const page = pagePart ? Number.parseInt(pagePart, 10) : 1;

	if (Number.isNaN(page) || page < 1) {
		try {
			await interaction.reply({
				content: "Invalid page.",
				flags: ["Ephemeral"],
			});
		} catch {}
		return;
	}

	const { container } = await buildListContainerForUser(
		interaction.user.id,
		page,
	);

	try {
		await interaction.update({ components: [container] });
	} catch (err) {
		try {
			await interaction.reply({
				content: "Could not update page, try /ticket list again.",
				flags: ["Ephemeral"],
			});
		} catch {}
		logger.error(err, "failed to update ticket list pagination");
	}
}

export async function handleList(
	_client: Client,
	interaction: ChatInputCommandInteraction,
) {
	if (!interaction.guild) {
		await interaction.reply({
			content: "❌ This command can only be used in a server.",
			flags: ["Ephemeral"],
		});
		return;
	}

	const { container } = await buildListContainerForUser(interaction.user.id, 1);

	await interaction.reply({
		components: [container],
		flags: ["IsComponentsV2", "Ephemeral"],
	});
}

export async function handleViewTicket(
	_client: Client,
	interaction: ChatInputCommandInteraction,
) {
	await interaction.deferReply();
	if (!interaction.guild) {
		await interaction.editReply({
			content: "❌ This command can only be used in a server.",
		});
		return;
	}

	const ticketId = interaction.options.getInteger("ticket_id", true);

	const { data: ticket, exists } = await getTicketByNumericId(
		interaction.guild.id,
		ticketId,
	);
	if (!exists || !ticket) {
		await interaction.editReply({
			content: `❌ Ticket with ID ${ticketId} not found.`,
		});
		return;
	}

	const isStaff = await hasManagerPermissions(
		interaction.member as GuildMember,
	);
	const isAuthor = ticket.authorId === interaction.user.id;

	if (!isStaff && !isAuthor) {
		await interaction.editReply({
			content: "❌ You don't have permission to view this ticket.",
		});
		return;
	}

	const { container, files } = await getTicketContainer(
		ticket,
		"view",
		!isStaff,
	);

	await interaction.editReply({
		components: [container],
		files: files,
		flags: ["IsComponentsV2"],
	});
}

export async function handleExport(
	_client: Client,
	interaction: ChatInputCommandInteraction,
) {
	const _tickets = await db
		.select()
		.from(tickets)
		.where(eq(tickets.authorId, interaction.user.id));

	const transcripts = await Promise.all(
		_tickets.map(async (ticket) => {
			const [transcriptText] = await generateTranscript(ticket);
			return transcriptText;
		}),
	);

	const combined = transcripts.join("\n\n\n\n");
	await interaction.reply({
		content: "Here is your exported ticket data:",
		files: [
			{
				attachment: Buffer.from(combined, "utf-8"),
				name: `tickets-export-${interaction.user.id}.txt`,
			},
		],
		flags: ["Ephemeral"],
	});
}