// Adapted from https://github.com/golang/go
// Original License:
//
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the https://go.dev/LICENSE file.

package caql

import (
	"errors"
	"strconv"
	"testing"
)

type quoteTest struct {
	in  string
	out string
}

var quotetests = []quoteTest{
	{in: "\a\b\f\r\n\t\v", out: `"\a\b\f\r\n\t\v"`},
	{"\\", `"\\"`},
	{"abc\xffdef", `"abc\xffdef"`},
	{"\u263a", `"☺"`},
	{"\U0010ffff", `"\U0010ffff"`},
	{"\x04", `"\x04"`},
	// Some non-printable but graphic runes. Final column is double-quoted.
	{"!\u00a0!\u2000!\u3000!", `"!\u00a0!\u2000!\u3000!"`},
}

type unQuoteTest struct {
	in  string
	out string
}

var unquotetests = []unQuoteTest{
	{`""`, ""},
	{`"a"`, "a"},
	{`"abc"`, "abc"},
	{`"☺"`, "☺"},
	{`"hello world"`, "hello world"},
	{`"\xFF"`, "\xFF"},
	{`"\377"`, "\377"},
	{`"\u1234"`, "\u1234"},
	{`"\U00010111"`, "\U00010111"},
	{`"\U0001011111"`, "\U0001011111"},
	{`"\a\b\f\n\r\t\v\\\""`, "\a\b\f\n\r\t\v\\\""},
	{`"'"`, "'"},

	{`'a'`, "a"},
	{`'☹'`, "☹"},
	{`'\a'`, "\a"},
	{`'\x10'`, "\x10"},
	{`'\377'`, "\377"},
	{`'\u1234'`, "\u1234"},
	{`'\U00010111'`, "\U00010111"},
	{`'\t'`, "\t"},
	{`' '`, " "},
	{`'\''`, "'"},
	{`'"'`, "\""},

	{"``", ``},
	{"`a`", `a`},
	{"`abc`", `abc`},
	{"`☺`", `☺`},
	{"`hello world`", `hello world`},
	{"`\\xFF`", `\xFF`},
	{"`\\377`", `\377`},
	{"`\\`", `\`},
	{"`\n`", "\n"},
	{"`	`", `	`},
	{"` `", ` `},
	{"`a\rb`", "ab"},
}

var misquoted = []string{
	``,
	`"`,
	`"a`,
	`"'`,
	`b"`,
	`"\"`,
	`"\9"`,
	`"\19"`,
	`"\129"`,
	`'\'`,
	`'\9'`,
	`'\19'`,
	`'\129'`,
	// `'ab'`,
	`"\x1!"`,
	`"\U12345678"`,
	`"\z"`,
	"`",
	"`xxx",
	"`\"",
	`"\'"`,
	`'\"'`,
	"\"\n\"",
	"\"\\n\n\"",
	"'\n'",
}

func TestUnquote(t *testing.T) {
	t.Parallel()

	for _, tt := range unquotetests {
		if out, err := unquote(tt.in); err != nil || out != tt.out {
			t.Errorf("unquote(%#q) = %q, %v want %q, nil", tt.in, out, err, tt.out)
		}
	}

	// run the quote tests too, backward
	for _, tt := range quotetests {
		if in, err := unquote(tt.out); in != tt.in {
			t.Errorf("unquote(%#q) = %q, %v, want %q, nil", tt.out, in, err, tt.in)
		}
	}

	for _, s := range misquoted {
		if out, err := unquote(s); out != "" || !errors.Is(err, strconv.ErrSyntax) {
			t.Errorf("unquote(%#q) = %q, %v want %q, %v", s, out, err, "", strconv.ErrSyntax)
		}
	}
}