package conf

import (
	"bytes"
	"errors"
	"reflect"
	"testing"
)

func Test_trim(t *testing.T) {
	tc := []struct {
		name string
		in   string
		want string
	}{
		{
			name: "empty",
			in:   "",
			want: "",
		},
		{
			name: "comment",
			in:   "# some comment",
			want: "",
		},
		{
			name: "comment",
			in:   "#some comment",
			want: "",
		},
		{
			name: "comment",
			in:   " #some comment",
			want: "",
		},
		{
			name: "key value",
			in:   "key = value",
			want: "key = value",
		},
		{
			name: "key value with whitespace",
			in:   " key = value ",
			want: "key = value",
		},
		{
			name: "key value with whitespace",
			in:   "\tkey = value  \t",
			want: "key = value",
		},
		{
			name: "key value with whitespace",
			in:   "\tkey = value  \t\n",
			want: "key = value",
		},
		{
			name: "key value with comment",
			in:   "key = value #comment",
			want: "key = value",
		},
		{
			name: "option",
			in:   "option \n",
			want: "option",
		},
		{
			name: "option with comment",
			in:   "option # comment \n",
			want: "option",
		},
	}

	for _, c := range tc {
		t.Run(c.name, func(t *testing.T) {
			have := trim(c.in)
			if have != c.want {
				t.Errorf("want: %s, have: %s", have, c.want)
			}
		})
	}
}

func TestRead(t *testing.T) {
	tc := []struct {
		name string
		in   []byte
		res  *Conf
		err  error
	}{
		{
			name: "empty",
			in:   []byte{},
			res: &Conf{
				settings: make(map[string]string),
				options:  map[string]struct{}{},
			},
			err: nil, // if the reader is empty its not out fault
		},
		{
			name: "single key with spaces",
			in:   []byte("key = value"),
			res: &Conf{
				settings: map[string]string{
					"key": "value",
				},
				options: make(map[string]struct{}),
			},
			err: nil,
		},
		{
			name: "single key no spaces",
			in:   []byte("key=value"),
			res: &Conf{
				settings: map[string]string{
					"key": "value",
				},
				options: make(map[string]struct{}),
			},
			err: nil,
		},
		{
			name: "single key with newline",
			in:   []byte("key=value\n"),
			res: &Conf{
				settings: map[string]string{
					"key": "value",
				},
				options: make(map[string]struct{}),
			},
			err: nil,
		},
		{
			name: "single key with comment and newline",
			in:   []byte("key =value # this is a comment\n"),
			res: &Conf{
				settings: map[string]string{
					"key": "value",
				},
				options: make(map[string]struct{}),
			},
			err: nil,
		},
	}

	for _, c := range tc {
		t.Run(c.name, func(t *testing.T) {
			r := bytes.NewReader(c.in)

			conf, err := Read(r)
			if !errors.Is(err, c.err) {
				t.Fatalf("want error: %v have: %v", c.err, err)
			}

			if !reflect.DeepEqual(c.res, conf) {
				t.Fatalf("want: %+v, have: %+v", c.res, conf)
			}
		})
	}
}