import { defineHook } from '@directus/extensions-sdk';
import { runBackfill } from '../lib/backfill';
import { recordOp } from '../lib/diagnostics';
import { replayFailureMap } from '../lib/failures';
import { buildRegistry, isImageType, loadCustomPresets } from '../lib/presets';
import { journalFailure, markRecovered, runDueRetries } from '../lib/retry';
import { readSettings } from '../lib/settings';
import { readRun } from '../lib/state';
import { warmFile } from '../lib/warmer';
import { isInWindow } from '../lib/window';

interface UploadMeta {
	key?: string;
	collection?: string;
	payload?: { type?: string | null; collection?: string };
}

export default defineHook(({ action, schedule }, { services, database, getSchema, env, logger }) => {
	action('files.upload', (meta) => {
		void warmUpload(meta as UploadMeta).catch((error) =>
			logger.error(error, 'image-previews: upload warm failed'),
		);
	});

	schedule('*/15 * * * *', () => {
		void scheduledBackfill().catch((error) =>
			logger.error(error, 'image-previews: scheduled run failed'),
		);
	});

	async function warmUpload(meta: UploadMeta): Promise<void> {
		const settings = await readSettings(env);

		if (!settings.enabled || !settings.onUpload) return;

		const fileId = meta?.key;
		const payload = meta?.payload;

		if (!fileId || !payload) return;
		if (payload.collection && payload.collection !== 'directus_files') return;
		if (!isImageType(payload.type)) return;

		const schema = await getSchema();
		const custom = await loadCustomPresets(new services['SettingsService']({ schema }));
		const presets = buildRegistry(custom, settings.presetKeys);

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

		const assets = new services['AssetsService']({ schema });
		const summary = await warmFile(assets, fileId, presets, {
			concurrency: settings.concurrency,
			formats: settings.formats,
			onResult: (result) =>
				recordOp({
					ts: Date.now(),
					fileId,
					key: result.key,
					format: result.format,
					ok: result.ok,
					ms: result.ms,
					error: result.error,
				}),
		});

		const failureRecords = await replayFailureMap(env);

		for (const result of summary.results) {
			if (result.ok) {
				await markRecovered(
					env,
					{
						file_id: fileId,
						preset_key: result.key,
						format: result.format,
						ms: result.ms,
					},
					{ records: failureRecords, logger },
				);
			} else {
				await journalFailure(
					env,
					{
						file_id: fileId,
						preset_key: result.key,
						format: result.format,
						error: result.error,
						ms: result.ms,
					},
					{ records: failureRecords, logger },
				);
			}
		}

		if (settings.debug) logger.info({ fileId, summary }, 'image-previews: warmed upload');
	}

	async function scheduledBackfill(): Promise<void> {
		const settings = await readSettings(env);

		if (!settings.enabled) return;
		if (!isInWindow(settings.windowStart, settings.windowEnd)) return;

		const run = await readRun(env);

		if (run?.running) return;

		const retryOutcome = await runDueRetries({ services, database, getSchema, env, logger }, {});

		if (retryOutcome.status === 'completed' && retryOutcome.processed > 0) {
			logger.info(retryOutcome, 'image-previews: due retries processed');
		}

		const finishedToday = run?.finishedAt
			? new Date(run.finishedAt).toDateString() === new Date().toDateString()
			: false;

		if (finishedToday && run && run.done >= run.total) return;

		logger.info('image-previews: scheduled backfill starting');

		void runBackfill({ services, database, getSchema, env, logger }, {}).catch((error) =>
			logger.error(error, 'image-previews: scheduled backfill failed'),
		);
	}
});