// This is Free Software under GNU Affero General Public License v >= 3.0
// without warranty, see README.md and license for details.
//
// SPDX-License-Identifier: AGPL-3.0-or-later
// License-Filename: LICENSES/AGPL-3.0.txt
//
// Copyright (C) 2018 by via donau
//   – Österreichische Wasserstraßen-Gesellschaft mbH
// Software engineering by Intevation GmbH
//
// Author(s):
//  * Sascha Wilde <sascha.wilde@intevation.de>
//  * Sascha Teichmann <sascha.teichmann@intevation.de>

package controllers

import (
	"database/sql"
	"net/http"
	"strings"

	"gemma.intevation.de/gemma/pkg/models"

	mw "gemma.intevation.de/gemma/pkg/middleware"
)

const (
	searchMostSQL = `SELECT search_most($1)::text`

	listBottlenecksSQL = `
SELECT COALESCE(json_agg(r),'[]')
FROM (
  SELECT
    objnam AS name,
    ST_AsGeoJSON(ST_Centroid(area))::json AS geom,
    'bottleneck' AS type
  FROM waterway.bottlenecks
  WHERE validity @> current_timestamp
ORDER BY objnam) r
`
)

func searchFeature(req *http.Request) (jr mw.JSONResult, err error) {

	s := mw.JSONInput(req).(*models.SearchRequest)

	if len(s.SearchString) == 0 {
		err = mw.JSONError{http.StatusBadRequest,
			"error: empty search string"}
		return
	}

	var result string
	err = mw.JSONConn(req).QueryRowContext(
		req.Context(),
		searchMostSQL,
		s.SearchString,
	).Scan(&result)

	if err != nil {
		return
	}

	jr.Result = strings.NewReader(result)
	return
}

func listBottlenecks(req *http.Request) (jr mw.JSONResult, err error) {

	var result string
	err = mw.JSONConn(req).QueryRowContext(
		req.Context(), listBottlenecksSQL).Scan(&result)

	switch {
	case err == sql.ErrNoRows:
		err = mw.JSONError{
			Code:    http.StatusNotFound,
			Message: "Cannot find any bottleneck.",
		}
		return
	case err != nil:
		return
	}

	jr = mw.JSONResult{Result: strings.NewReader(result)}
	return
}