/**
 * Required External Modules and Interfaces
 */
import express, {Request, Response} from 'express';
import {Guid} from 'guid-typescript';
import logger from '../../../middleware/logger';
import * as ReportsAdminService from './reports.admin.service';
import * as CsvService from './csv.service';
import * as EventsAdminService from './events.admin.service';

/**
 * Router Definition
 */
export const reportsAdminRouter = express.Router();

const sendServerError = (res: Response, e: any) => {
	let errorGuid = Guid.create().toString();
	logger.error('Error handling a request: ' + e.message, {reference: errorGuid});
	res.status(500).send({
		'status': 'PROCESSING_ERROR',
		'message': 'Internal Server Error. Try again later.',
		'reference': errorGuid
	});
};

/**
 * @swagger
 * /feedback/admin/events/{eventId}/report:
 *      get:
 *          summary: Aggregated feedback report for one event
 *          description: Song-pick vote counts, song-rating averages, capped free-text list, guest book count, and newsletter sync counts.
 *          tags: [feedback-admin]
 *          parameters:
 *              - $ref: '#/components/parameters/SessionIdHeader'
 *              - $ref: '#/components/parameters/SessionKeyHeader'
 *              - in: path
 *                name: eventId
 *                required: true
 *                schema:
 *                    type: integer
 *          responses:
 *              200:
 *                  description: Success
 *              404:
 *                  description: Unknown event
 *              401:
 *                  description: Unauthorized
 */
reportsAdminRouter.get('/:eventId/report', async (req: Request, res: Response) => {
	try {
		const report = await ReportsAdminService.getReport(Number(req.params.eventId));
		if (!report) {
			res.status(404).send({status: 'NOT_FOUND'});
			return;
		}
		res.status(200).send(report);
	} catch (e: any) {
		sendServerError(res, e);
	}
});

/**
 * @swagger
 * /feedback/admin/events/{eventId}/guestbook:
 *      get:
 *          summary: Guest Book entries for one event
 *          description: Newest first, paginated.
 *          tags: [feedback-admin]
 *          parameters:
 *              - $ref: '#/components/parameters/SessionIdHeader'
 *              - $ref: '#/components/parameters/SessionKeyHeader'
 *              - in: path
 *                name: eventId
 *                required: true
 *                schema:
 *                    type: integer
 *              - in: query
 *                name: page
 *                schema:
 *                    type: integer
 *              - in: query
 *                name: pageSize
 *                schema:
 *                    type: integer
 *              - in: query
 *                name: search
 *                description: Filters entries whose name or message contains this text (case-insensitive).
 *                schema:
 *                    type: string
 *          responses:
 *              200:
 *                  description: Success
 *              401:
 *                  description: Unauthorized
 */
reportsAdminRouter.get('/:eventId/guestbook', async (req: Request, res: Response) => {
	try {
		const page = Math.max(1, Number(req.query.page) || 1);
		const pageSize = Math.min(200, Math.max(1, Number(req.query.pageSize) || 50));
		const search = typeof req.query.search === 'string' ? req.query.search : undefined;
		const result = await ReportsAdminService.getGuestBookEntries(Number(req.params.eventId), page, pageSize, search);
		res.status(200).send(result);
	} catch (e: any) {
		sendServerError(res, e);
	}
});

/**
 * @swagger
 * /feedback/admin/events/{eventId}/newsletter:
 *      get:
 *          summary: Newsletter signups for one event
 *          description: Includes sync_status, so failures can be handled manually.
 *          tags: [feedback-admin]
 *          parameters:
 *              - $ref: '#/components/parameters/SessionIdHeader'
 *              - $ref: '#/components/parameters/SessionKeyHeader'
 *              - in: path
 *                name: eventId
 *                required: true
 *                schema:
 *                    type: integer
 *          responses:
 *              200:
 *                  description: Success
 *              401:
 *                  description: Unauthorized
 */
reportsAdminRouter.get('/:eventId/newsletter', async (req: Request, res: Response) => {
	try {
		res.status(200).send(await ReportsAdminService.getNewsletterSignups(Number(req.params.eventId)));
	} catch (e: any) {
		sendServerError(res, e);
	}
});

/**
 * @swagger
 * /feedback/admin/events/{eventId}/export/responses.csv:
 *      get:
 *          summary: CSV export of all answers for one event
 *          description: Long format, one row per answer. UTF-8 BOM, `;` separator, RFC 4180 escaping, formula-injection guard.
 *          tags: [feedback-admin]
 *          parameters:
 *              - $ref: '#/components/parameters/SessionIdHeader'
 *              - $ref: '#/components/parameters/SessionKeyHeader'
 *              - in: path
 *                name: eventId
 *                required: true
 *                schema:
 *                    type: integer
 *          responses:
 *              200:
 *                  description: CSV file
 *                  content:
 *                      text/csv: {}
 *              401:
 *                  description: Unauthorized
 */
reportsAdminRouter.get('/:eventId/export/responses.csv', async (req: Request, res: Response) => {
	try {
		const eventId = Number(req.params.eventId);
		const event = await EventsAdminService.getEventAdmin(eventId);
		if (!event) {
			res.status(404).send({status: 'NOT_FOUND'});
			return;
		}
		const csv = await CsvService.buildResponsesCsv(eventId);
		res.status(200)
			.set('Content-Type', 'text/csv; charset=utf-8')
			.set('Content-Disposition', `attachment; filename="nachklang-feedback-${event.slug}.csv"`)
			.send(csv);
	} catch (e: any) {
		sendServerError(res, e);
	}
});

/**
 * @swagger
 * /feedback/admin/events/{eventId}/export/guestbook.csv:
 *      get:
 *          summary: CSV export of Guest Book entries for one event
 *          tags: [feedback-admin]
 *          parameters:
 *              - $ref: '#/components/parameters/SessionIdHeader'
 *              - $ref: '#/components/parameters/SessionKeyHeader'
 *              - in: path
 *                name: eventId
 *                required: true
 *                schema:
 *                    type: integer
 *          responses:
 *              200:
 *                  description: CSV file
 *                  content:
 *                      text/csv: {}
 *              401:
 *                  description: Unauthorized
 */
reportsAdminRouter.get('/:eventId/export/guestbook.csv', async (req: Request, res: Response) => {
	try {
		const eventId = Number(req.params.eventId);
		const event = await EventsAdminService.getEventAdmin(eventId);
		if (!event) {
			res.status(404).send({status: 'NOT_FOUND'});
			return;
		}
		const csv = await CsvService.buildGuestBookCsv(eventId);
		res.status(200)
			.set('Content-Type', 'text/csv; charset=utf-8')
			.set('Content-Disposition', `attachment; filename="nachklang-feedback-guestbook-${event.slug}.csv"`)
			.send(csv);
	} catch (e: any) {
		sendServerError(res, e);
	}
});