import { prisma } from './db.js';
import { logger } from './logger.js';
import crypto from 'crypto';

export async function dispatchWebhooks(tenantId: string, event: string, data: any) {
	// Don't await this - fire and forget
	doDispatch(tenantId, event, data).catch((err) => {
		logger.error({ err, tenantId, event }, 'webhook dispatch failed');
	});
}

function isDiscordWebhook(url: string): boolean {
	return url.startsWith('https://discord.com/api/webhooks/') ||
		url.startsWith('https://discordapp.com/api/webhooks/');
}

async function getTenantBaseUrl(tenantId: string): Promise<string> {
	const hostname = await prisma.tenantHostname.findFirst({
		where: { tenantId, isPrimary: true },
		select: { hostname: true }
	});
	if (hostname) return `https://${hostname.hostname}`;
	// Fallback to any hostname
	const any = await prisma.tenantHostname.findFirst({
		where: { tenantId },
		select: { hostname: true }
	});
	return any ? `https://${any.hostname}` : '';
}

function formatDiscordPayload(event: string, data: any, baseUrl: string): object {
	const colors: Record<string, number> = {
		'card:created': 0x22c55e,   // green
		'card:updated': 0x3b82f6,   // blue
		'card:moved': 0xf59e0b,     // amber
		'card:deleted': 0xef4444,   // red
		'column:created': 0x10b981, // emerald
		'column:deleted': 0xf97316, // orange
		'board:updated': 0x8b5cf6,  // purple
	};

	const cardTitle = data.card?.title || data.cardTitle || 'Unknown';
	const cardLink = data.cardUrl && baseUrl ? `[${cardTitle}](${baseUrl}${data.cardUrl})` : cardTitle;

	let description = '';
	const fields: { name: string; value: string; inline?: boolean }[] = [];

	switch (event) {
		case 'card:created':
			description = `New card: ${cardLink}`;
			break;

		case 'card:updated':
			description = `Updated: ${cardLink}`;
			if (data.fields?.length) {
				fields.push({ name: 'Changed', value: data.fields.join(', '), inline: true });
			}
			break;

		case 'card:moved':
			description = `Moved: ${cardLink}`;
			if (data.from && data.to) {
				fields.push({ name: 'From', value: data.from, inline: true });
				fields.push({ name: 'To', value: data.to, inline: true });
			}
			break;

		case 'card:deleted':
			description = `Deleted: **${cardTitle}**`;
			break;

		case 'column:created':
			description = `New column: **${data.column?.title || 'Unknown'}**`;
			break;

		case 'column:deleted':
			description = `Deleted column \`${data.columnId}\``;
			break;

		case 'board:updated':
			description = `Board updated: **${data.board?.title || 'Unknown'}**`;
			break;
	}

	return {
		embeds: [{
			title: event.replace(':', ' ').replace(/\b\w/g, (c: string) => c.toUpperCase()),
			description,
			color: colors[event] || 0x6b7280,
			fields: fields.length > 0 ? fields : undefined,
			timestamp: new Date().toISOString(),
			footer: { text: 'Pounce' }
		}]
	};
}

async function doDispatch(tenantId: string, event: string, data: any) {
	const webhooks = await prisma.webhook.findMany({
		where: { tenantId, active: true, events: { has: event } }
	});

	logger.info({ tenantId, event, webhookCount: webhooks.length }, 'dispatching webhooks');

	if (webhooks.length === 0) return;

	// Resolve base URL once for Discord webhooks
	const hasDiscord = webhooks.some((w) => isDiscordWebhook(w.url));
	const baseUrl = hasDiscord ? await getTenantBaseUrl(tenantId) : '';

	for (const webhook of webhooks) {
		const isDiscord = isDiscordWebhook(webhook.url);

		let body: string;
		let headers: Record<string, string>;

		if (isDiscord) {
			body = JSON.stringify(formatDiscordPayload(event, data, baseUrl));
			headers = { 'Content-Type': 'application/json' };
		} else {
			body = JSON.stringify({ event, data, timestamp: new Date().toISOString() });
			const signature = crypto.createHmac('sha256', webhook.secret).update(body).digest('hex');
			headers = {
				'Content-Type': 'application/json',
				'X-Pounce-Signature': signature,
				'X-Pounce-Event': event
			};
		}

		fetch(webhook.url, { method: 'POST', headers, body })
			.then((res) => {
				if (!res.ok) {
					res.text().then((text) => {
						logger.warn({ webhookId: webhook.id, status: res.status, event, response: text.slice(0, 200) }, 'webhook delivery failed');
					});
				}
			})
			.catch((err) => {
				logger.warn({ err, webhookId: webhook.id, event }, 'webhook delivery error');
			});
	}
}