'use strict';

require('../helper');

var server = require('../../lib/server')();
var assert = require('../support/assert');
var querystring = require('querystring');
var step = require('step');

describe('results-pagination', function () {
    var RESPONSE_OK = {
        statusCode: 200
    };

    // Test for https://github.com/Vizzuality/CartoDB-SQL-API/issues/85
    it("paging doesn't break x-cache-channel", function (done) {
        assert.response(server, {
            url: '/api/v1/sql?' + querystring.stringify({
            // note: select casing intentionally mixed
                q: 'selECT cartodb_id*3 FROM untitle_table_4',
                api_key: '1234',
                rows_per_page: 1,
                page: 2
            }),
            headers: { host: 'vizzuality.cartodb.com' },
            method: 'GET'
        }, RESPONSE_OK, function (err, res) {
            assert.equal(res.headers['x-cache-channel'], 'cartodb_test_user_1_db:public.untitle_table_4');
            var parsed = JSON.parse(res.body);
            assert.equal(parsed.rows.length, 1);
            done();
        });
    });

    // Test page and rows_per_page params
    it('paging', function (done) {
        var sql = 'SELECT * FROM (VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9)) t(v)';
        var pr = [[2, 3], [0, 4]]; // page and rows
        var methods = ['GET', 'POST'];
        var authorized = 0;
        var testing = 0;
        var method = 0;
        // jshint maxcomplexity:7
        var testNext = function () {
            if (testing >= pr.length) {
                if (method + 1 >= methods.length) {
                    if (authorized) {
                        done();
                        return;
                    } else {
                        authorized = 1;
                        method = 0;
                        testing = 0;
                    }
                } else {
                    testing = 0;
                    ++method;
                }
            }
            var prcur = pr[testing++];
            var page = prcur[0];
            var nrows = prcur[1];
            var data_obj = {
                q: sql,
                rows_per_page: nrows,
                page: page
            };
            if (authorized) {
                data_obj.api_key = '1234';
            }
            var data = querystring.stringify(data_obj);
            var req = {
                url: '/api/v1/sql',
                headers: { host: 'vizzuality.cartodb.com' }
            };
            if (methods[method] === 'GET') {
                req.method = 'GET';
                req.url += '?' + data;
            } else {
                req.method = 'POST';
                req.headers['Content-Type'] = 'application/x-www-form-urlencoded';
                req.data = data;
            }
            assert.response(server, req, RESPONSE_OK, function (err, res) {
                var parsed = JSON.parse(res.body);
                assert.equal(parsed.rows.length, nrows);
                for (var i = 0; i < nrows; ++i) {
                    var obt = parsed.rows[i].v;
                    var exp = page * nrows + i + 1;
                    assert.equal(obt, exp, 'Value ' + i + ' in page ' + page + ' is ' + obt + ', expected ' + exp);
                }
                testNext();
            });
        };
        testNext();
    });

    // Test paging with WITH queries
    it('paging starting with comment', function (done) {
        var sql = '-- this is a comment\n' +
                'SELECT * FROM (VALUES(1),(2),(3),(4),(5),(6),(7),(8),(9)) t(v)';
        var nrows = 3;
        var page = 2;
        assert.response(server, {
            url: '/api/v1/sql?' + querystring.stringify({
                q: sql,
                rows_per_page: nrows,
                page: page
            }),
            headers: { host: 'vizzuality.cartodb.com' },
            method: 'GET'
        }, RESPONSE_OK, function (err, res) {
            var parsed = JSON.parse(res.body);
            assert.equal(parsed.rows.length, 3);
            for (var i = 0; i < nrows; ++i) {
                var obt = parsed.rows[i].v;
                var exp = page * nrows + i + 1;
                assert.equal(obt, exp, 'Value ' + i + ' in page ' + page + ' is ' + obt + ', expected ' + exp);
            }
            done();
        });
    });

    // See http://github.com/CartoDB/CartoDB-SQL-API/issues/127
    it('SELECT INTO with paging', function (done) {
        var esc_tabname = 'test ""select into""'; // escaped ident
        step(
            function select_into () {
                var next = this;
                assert.response(server, {
                    url: '/api/v1/sql?' + querystring.stringify({
                        q: 'SELECT generate_series(1,10) InTO "' + esc_tabname + '"',
                        rows_per_page: 1,
                        page: 1,
                        api_key: 1234
                    }),
                    headers: { host: 'vizzuality.cartodb.com' },
                    method: 'GET'
                }, RESPONSE_OK, function (err, res) { next(null, res); });
            },
            function check_res_test_fake_into_1 (err) {
                assert.ifError(err);
                var next = this;
                assert.response(server, {
                    url: '/api/v1/sql?' + querystring.stringify({
                        q: 'SELECT \' INTO "c"\' FROM "' + esc_tabname + '"',
                        rows_per_page: 1,
                        page: 1,
                        api_key: 1234
                    }),
                    headers: { host: 'vizzuality.cartodb.com' },
                    method: 'GET'
                }, RESPONSE_OK, function (err, res) { next(null, res); });
            },
            function check_res_drop_table (err, res) {
                assert.ifError(err);
                var out = JSON.parse(res.body);
                assert.equal(out.total_rows, 1); // windowing works
                var next = this;
                assert.response(server, {
                    url: '/api/v1/sql?' + querystring.stringify({
                        q: 'DROP TABLE "' + esc_tabname + '"',
                        api_key: 1234
                    }),
                    headers: { host: 'vizzuality.cartodb.com' },
                    method: 'GET'
                }, RESPONSE_OK, function (err, res) { next(null, res); });
            },
            done
        );
    });
});