import { SlashCommandBuilder } from "discord.js";
import type {
	AutocompleteInteraction,
	ChatInputCommandInteraction,
	Client,
	GuildMember,
} from "discord.js";
import { ChannelType, type GuildChannel, type Role } from "discord.js";

import cfg from "@/config";
import { db, guild as guildTable, manager as managerTable } from "@/database";
import { getGuild } from "@/database/queries";
import { hasManagerPermissions } from "@/utils/discord/permissions";
import { loggers } from "@/utils/logging";
import { eq } from "drizzle-orm";

const logger = loggers.interactions.child({ name: "configCommand" });

const CONFIG_KEYS = [
	"suggestion_forum_id",
	"bug_channel_id",
	"highlights_channel_id",
	"commands_channel_id",
	"ticket_channel_id",
	"ticket_category_id",
	"ticket_message",
] as const;

function isChannelKey(key: string) {
	return key.endsWith("_id");
}

const commandData = new SlashCommandBuilder()
	.setName("config")
	.setDescription("configure bot settings for this server")
	.addSubcommand((sub) =>
		sub
			.setName("manager-role")
			.setDescription("manage roles that can manage reports/tickets")
			.addStringOption((opt) =>
				opt
					.setName("action")
					.setDescription("action to perform")
					.setRequired(true)
					.addChoices(
						{ name: "add", value: "add" },
						{ name: "remove", value: "remove" },
						{ name: "list", value: "list" },
					),
			)
			.addRoleOption((opt) => opt.setName("role").setDescription("role to add/remove")),
	)
	.addSubcommand((sub) =>
		sub
			.setName("set")
			.setDescription("set a guild configuration key")
			.addStringOption((opt) =>
				opt
					.setName("key")
					.setDescription("configuration key to set")
					.setRequired(true)
					.setAutocomplete(true),
			)
			.addChannelOption((opt) =>
				opt
					.setName("channel")
					.setDescription("channel to set (for channel keys)")
					.setRequired(false),
			)
			.addStringOption((opt) =>
				opt
					.setName("value")
					.setDescription("value to set (for non-channel keys)")
					.setRequired(false),
			),
	)
	.addSubcommand((sub) => sub.setName("view").setDescription("view current server configuration"));

async function autocomplete(interaction: AutocompleteInteraction) {
	const focused = interaction.options.getFocused(true);
	if (focused.name === "key") {
		const input = String(focused.value).toLowerCase();
		const suggestions = CONFIG_KEYS.filter((k) => k.toLowerCase().includes(input)).slice(0, 25);

		await interaction.respond(suggestions.map((s) => ({ name: s, value: s })));
	}
}

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

	const isDev = interaction.user.id === cfg.developerId;
	const isManager = hasManagerPermissions(interaction.member as GuildMember);

	if (!(isDev || isManager)) {
		await interaction.reply({
			content: "❌ You do not have permission to manage this server.",
			flags: ["Ephemeral"],
		});
		return;
	}

	const sub = interaction.options.getSubcommand();

	try {
		if (sub === "manager-role") {
			await handleManagerRole(interaction);
		} else if (sub === "set") {
			await handleSet(interaction);
		} else if (sub === "view") {
			await handleView(interaction);
		} else {
			await interaction.reply({
				content: "❌ Unknown subcommand.",
				flags: ["Ephemeral"],
			});
		}
	} catch (err) {
		logger.error(err, "Failed to execute config command");
		await interaction.reply({
			content: "❌ Failed to update configuration, please try again later.",
			flags: ["Ephemeral"],
		});
	}
}

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

	const action = interaction.options.getString("action", true);
	const role = interaction.options.getRole("role") as Role | null;
	const guildId = interaction.guild.id;

	const isDeveloper = interaction.user.id === cfg.developerId;
	const hasPerms = await hasManagerPermissions(interaction.member as GuildMember);

	if (!isDeveloper && !hasPerms) {
		await interaction.reply({
			content: "❌ You do not have manager permissions to run this action.",
			flags: ["Ephemeral"],
		});
		return;
	}

	if (action === "list") {
		const rows = await db
			.select({ roleId: managerTable.roleId })
			.from(managerTable)
			.where(eq(managerTable.guildId, guildId))
			.execute();

		if (!rows || rows.length === 0) {
			await interaction.reply({
				content: "📋 There are no manager roles configured for this server.",
				flags: ["Ephemeral"],
			});
			return;
		}

		const mentions = rows.map((r) => `\* <@&${r.roleId}>`).join("\n");
		await interaction.reply({
			content: `**📋 Manager roles**\n${mentions}`,
			flags: ["Ephemeral"],
		});
		return;
	}

	if (!role) {
		await interaction.reply({
			content: "❌ You must specify a role for this action.",
			flags: ["Ephemeral"],
		});
		return;
	}

	if (action === "add") {
		const existing = await db
			.select()
			.from(managerTable)
			.where(eq(managerTable.roleId, role.id))
			.execute();

		if (existing && existing.length > 0) {
			await interaction.reply({
				content: `❌ ${role} is already configured as a manager role.`,
				flags: ["Ephemeral"],
			});
			return;
		}

		await db
			.insert(managerTable)
			.values({
				roleId: role.id,
				guildId,
			})
			.execute();

		await interaction.reply({
			content: `✅ Added ${role} as a manager role.`,
			flags: ["Ephemeral"],
		});
		return;
	}

	if (action === "remove") {
		await db.delete(managerTable).where(eq(managerTable.roleId, role.id)).execute();

		await interaction.reply({
			content: `✅ Removed ${role} from manager roles.`,
			flags: ["Ephemeral"],
		});
		return;
	}

	await interaction.reply({
		content: "❌ unknown action.",
		flags: ["Ephemeral"],
	});
}

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

	const key = interaction.options.getString("key", true);

	// @ts-expect-error shush
	if (!CONFIG_KEYS.includes(key)) {
		await interaction.reply({
			content: "❌ Unknown configuration key.",
			flags: ["Ephemeral"],
		});
		return;
	}

	const guildId = interaction.guild.id;

	await getGuild(guildId);

	if (isChannelKey(key)) {
		const channel = interaction.options.getChannel("channel", false) as GuildChannel | null;

		if (!channel) {
			await interaction.reply({
				content: "❌ this key expects a channel - please provide a channel.",
				flags: ["Ephemeral"],
			});
			return;
		}

		const allowedTypes = [
			ChannelType.GuildText,
			ChannelType.GuildAnnouncement,
			ChannelType.GuildCategory,
		];
		if (!allowedTypes.includes(channel.type)) {
			await interaction.reply({
				content: "❌ Channel must be a text channel or category.",
				flags: ["Ephemeral"],
			});
			return;
		}

		await db
			.update(guildTable)
			.set({ [key]: channel.id })
			.where(eq(guildTable.guildId, guildId))
			.execute();

		await interaction.reply({
			content: `✅ Set \`${key}\` to <#${channel.id}>.`,
			flags: ["Ephemeral"],
		});
		return;
	}

	const value = interaction.options.getString("value", true);
	await db
		.update(guildTable)
		.set({ [key]: value })
		.where(eq(guildTable.guildId, guildId))
		.execute();

	await interaction.reply({
		content: `✅ set ${key} to \`${value}\`.`,
		flags: ["Ephemeral"],
	});
}

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

	const guildId = interaction.guild.id;
	const result = await db
		.select()
		.from(guildTable)
		.where(eq(guildTable.guildId, guildId))
		.execute();

	if (!result || result.length === 0) {
		await interaction.reply({
			content: "📋 No configuration found for this server.",
			flags: ["Ephemeral"],
		});
		return;
	}

	const row = result[0] as Record<string, string>;
	const lines = CONFIG_KEYS.map((k) => {
		const val = row[k];
		if (!val) return `- \`${k}\` - unset`;
		if (isChannelKey(k)) return `- \`${k}\` <#${val}>`;
		return `- \`${k}\` ${val}`;
	});

	await interaction.reply({
		content: `# 📋 Server Configuration\n${lines.join("\n")}`,
		flags: ["Ephemeral"],
	});
}

export default {
	data: commandData,
	execute,
	autocomplete,
};