package nomino

import (
	"errors"
	"testing"

	"github.com/stretchr/testify/assert"
)

var errTest = errors.New("sorry")

func TestMake(t *testing.T) {
	genOpt := WithGenerator(func(*Config) (string, error) { return "abc", nil })
	testcases := []struct {
		name string
		opts []Option
		exp  string
	}{
		{"basic", nil, "abc.txt"},
		{"with prefix", []Option{WithPrefix("foo")}, "foo_abc.txt"},
		{"with suffix", []Option{WithSuffix("bar")}, "abc_bar.txt"},
		{"with original", []Option{WithOriginal("file")}, "abc_file.txt"},
		{"without ext", []Option{WithoutExtension()}, "abc"},
		{"with ext", []Option{WithExtension("xml")}, "abc.xml"},
		{"with sep", []Option{WithOriginal("file"), WithSeparator("---")}, "abc---file.txt"},
		{
			"with all",
			[]Option{
				WithPrefix("pre"),
				WithOriginal("file"),
				WithSuffix("suff"),
				WithExtension("svg"),
				WithSeparator("+"),
			},
			"pre+abc+file+suff.svg",
		},
	}

	for _, testcase := range testcases {
		t.Run(testcase.name, func(sub *testing.T) {
			opts := testcase.opts
			opts = append(opts, genOpt)

			conf := NewConfig(opts...)
			st, err := Make(conf)
			assert.NoError(t, err)
			assert.Equal(t, testcase.exp, st)
		})
	}
}

func TestMakeErr(t *testing.T) {
	conf := NewConfig(WithGenerator(func(*Config) (string, error) { return "foobar", errTest }))
	st, err := Make(conf)
	assert.Zero(t, st)
	assert.ErrorIs(t, err, errTest)
}

func TestMakeDoesntChangeConf(t *testing.T) {
	gen := func(c *Config) (string, error) {
		c.original = ""
		return "foo", nil
	}
	conf := NewConfig(WithGenerator(gen), WithOriginal("foobar"))
	st, err := Make(conf)
	assert.Equal(t, "foobar", conf.original)
	assert.Equal(t, "foo.txt", st)
	assert.NoError(t, err)
}

func TestMakeOptsDoesntChangeConf(t *testing.T) {
	gen := Incremental()
	conf := NewConfig(WithGenerator(gen), WithPrefix("pre"))

	st, err := Make(conf, WithOriginal("foobar"))
	assert.Equal(t, "", conf.original)
	assert.Equal(t, "pre_0_foobar.txt", st)
	assert.NoError(t, err)

	st, err = Make(conf, WithOriginal("baz"))
	assert.Equal(t, "", conf.original)
	assert.Equal(t, "pre_1_baz.txt", st)
	assert.NoError(t, err)
}