// Copyright 2017 Pilosa Corp.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package pql_test

import (
	"strings"
	"testing"

	"github.com/pilosa/pilosa/pql"
)

func TestScanner_Scan(t *testing.T) {
	var tests = []struct {
		name string
		s    string
		tok  pql.Token
		lit  string
		pos  pql.Pos
	}{
		// Special tokens (EOF, ILLEGAL, WS)
		{name: "EOF", s: ``, tok: pql.EOF},
		{name: "ILLEGAL", s: `#`, tok: pql.ILLEGAL, lit: `#`},
		{name: "WS/SPACE", s: ` `, tok: pql.WS, lit: " "},
		{name: "WS/TAB", s: "\t", tok: pql.WS, lit: "\t"},
		{name: "WS/NEWLINE", s: "\n", tok: pql.WS, lit: "\n"},

		{name: "ASSIGN", s: `=`, tok: pql.ASSIGN, lit: `=`},
		{name: "EQ", s: `==`, tok: pql.EQ, lit: `==`},
		{name: "NEQ", s: `!=`, tok: pql.NEQ, lit: `!=`},
		{name: "LT", s: `<`, tok: pql.LT, lit: `<`},
		{name: "LTE", s: `<=`, tok: pql.LTE, lit: `<=`},
		{name: "GT", s: `>`, tok: pql.GT, lit: `>`},
		{name: "GTE", s: `>=`, tok: pql.GTE, lit: `>=`},
		{name: "BETWEEN", s: `><`, tok: pql.BETWEEN, lit: `><`},
		{name: "COMMA", s: `,`, tok: pql.COMMA, lit: `,`},
		{name: "LPAREN", s: `(`, tok: pql.LPAREN, lit: `(`},
		{name: "RPAREN", s: `)`, tok: pql.RPAREN, lit: `)`},
		{name: "LBRACK", s: `[`, tok: pql.LBRACK, lit: `[`},
		{name: "RBRACK", s: `]`, tok: pql.RBRACK, lit: `]`},

		{name: "IDENT", s: `foo`, tok: pql.IDENT, lit: `foo`},
		{name: "INTEGER", s: `100`, tok: pql.INTEGER, lit: `100`},
		{name: "FLOAT", s: `100.3`, tok: pql.FLOAT, lit: `100.3`},

		{name: "ALL", s: `all`, tok: pql.ALL, lit: `all`},
		{name: "ALL/CASE", s: `ALL`, tok: pql.ALL, lit: `ALL`}, // case insensitive
	}

	for i, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			s := pql.NewScanner(strings.NewReader(tt.s))
			tok, pos, lit := s.Scan()
			if tt.tok != tok {
				t.Errorf("%d. %q token mismatch: exp=%q got=%q <%q>", i, tt.s, tt.tok, tok, lit)
			} else if tt.pos.Line != pos.Line || tt.pos.Char != pos.Char {
				t.Errorf("%d. %q pos mismatch: exp=%#v got=%#v", i, tt.s, tt.pos, pos)
			} else if tt.lit != lit {
				t.Errorf("%d. %q literal mismatch: exp=%q got=%q", i, tt.s, tt.lit, lit)
			}
		})
	}
}