package nginx

import (
	"errors"
	"strings"
	"testing"
)

func TestEachLineType(t *testing.T) {

	tests := []struct {
		Raw        string
		Components []string
		Type       LineType
	}{
		{"key value;\n", []string{"key", "value"}, ASSIGNMENT},
		{"key    value;\n", []string{"key", "value"}, ASSIGNMENT},
		{"key  \t  value;\n", []string{"key", "value"}, ASSIGNMENT},
		{"key\tvalue;\n", []string{"key", "value"}, ASSIGNMENT},
		{"ke-y value;\n", []string{"ke-y", "value"}, ASSIGNMENT},
		{"ke_y value;\n", []string{"ke_y", "value"}, ASSIGNMENT},
		{"key value;  \n", []string{"key", "value"}, ASSIGNMENT},
		{"key value;\t\n", []string{"key", "value"}, ASSIGNMENT},
		{"\tkey value;\n", []string{"key", "value"}, ASSIGNMENT},
		{"  \t  key value;\n", []string{"key", "value"}, ASSIGNMENT},

		{"include ./file/*.conf;\n", []string{"./file/*.conf"}, INCLUDE},
		{"include ./file/*.conf;  \n", []string{"./file/*.conf"}, INCLUDE},
		{"include ./file/*.conf;\t\n", []string{"./file/*.conf"}, INCLUDE},
		{"\tinclude ./file/*.conf;\n", []string{"./file/*.conf"}, INCLUDE},
		{"  \t  include ./file/*.conf;\n", []string{"./file/*.conf"}, INCLUDE},

		{"sectionname {\n}\n", []string{"sectionname"}, SECTION},
		{"section-name {\n}\n", []string{"section-name"}, SECTION},
		{"section_name {\n}\n", []string{"section_name"}, SECTION},
		{"sectionname {  \n}\n", []string{"sectionname"}, SECTION},
		{"sectionname {\t\n}\n", []string{"sectionname"}, SECTION},
		{"sectionname ~ with-args {\t\n}\n", []string{"sectionname", "~ with-args"}, SECTION},
		{"\tsectionname {\n}\n", []string{"sectionname"}, SECTION},
		{"  \t  sectionname {\n}\n", []string{"sectionname"}, SECTION},

		{"#some comment\n", []string{"some comment"}, COMMENT},
		{"#some\tcomment\n", []string{"some\tcomment"}, COMMENT},
		{"# some  comment  \n", []string{" some  comment"}, COMMENT},
		{"# some comment \t\n", []string{" some comment"}, COMMENT},
		{"\t# some comment {\n", []string{" some comment {"}, COMMENT},

		{";some comment\n", []string{"some comment"}, COLONCOMMENT},
		{"; some\tcomment\n", []string{" some\tcomment"}, COLONCOMMENT},
		{"; some   comment\n", []string{" some   comment"}, COLONCOMMENT},
		{"; some comment  \n", []string{" some comment"}, COLONCOMMENT},
		{"; some comment \t\n", []string{" some comment"}, COLONCOMMENT},
		{"\t; some comment {\n", []string{" some comment {"}, COLONCOMMENT},
	}

	for i, test := range tests {

		// 1. create reader
		decoder := NewDecoder(strings.NewReader(test.Raw))

		// 2. Decode
		receiver := new(Line)
		err := decoder.Decode(receiver)

		if err != nil {
			t.Errorf("[%d] unexpected error <%s>", i, err)
			continue
		}

		if len(receiver.Lines) != 1 {
			t.Errorf("[%d] expected only 1 element, got %d", i, len(receiver.Lines))
			continue
		}

		if receiver.Lines[0].Type != test.Type {
			t.Errorf("[%d] expected type %d, got %d", i, test.Type, receiver.Lines[0].Type)
			continue
		}

		if receiver.Lines[0].Components == nil && test.Components != nil {
			t.Errorf("[%d] expected components not to be null", i)
			continue
		}
		if len(receiver.Lines[0].Components) != len(test.Components) {
			t.Errorf("[%d] expected %d components, got %d", i, len(test.Components), len(receiver.Lines[0].Components))
			continue
		}

		// check each component individually
		for c, comp := range receiver.Lines[0].Components {
			if comp != test.Components[c] {
				t.Errorf("[%d] expected component %d to be '%s', got '%s'", i, c, test.Components[c], comp)
			}
		}

	}
}

func TestNestedSections(t *testing.T) {

	tests := []struct {
		Raw          string
		SectionChain []string
	}{

		{"a{\n}\n", []string{"a"}},
		{"a{\n\n}\n", []string{"a"}},
		{"a{\n; some comment\n}\n", []string{"a"}},
		{"a{\n; some comment\n #another comment\n}\n", []string{"a"}},
		{"a{\nb{\n}\n}\n", []string{"a", "b"}},
		{"a{\n\tb{\n\t}\n}\n", []string{"a", "b"}},
		{"a{\n\tb{\n\t\tc{\n\t\t}\n\t}\n}\n", []string{"a", "b", "c"}},
	}

	for i, test := range tests {

		// 1. create reader
		decoder := NewDecoder(strings.NewReader(test.Raw))

		// 2. Decode
		receiver := new(Line)
		err := decoder.Decode(receiver)

		if err != nil {
			t.Errorf("[%d] unexpected error <%s>", i, err)
			continue
		}

		if len(receiver.Lines) != 1 {
			t.Errorf("[%d] expected only 1 element, got %d", i, len(receiver.Lines))
			continue
		}

		if receiver.Lines[0].Type != SECTION {
			t.Errorf("[%d] expected type %d, got %d", i, SECTION, receiver.Lines[0].Type)
			continue
		}

		// check each component individually
		current := receiver.Lines
		for s, sec := range test.SectionChain {

			// check that section exists in <current>
			found := false
			for _, line := range current {

				// found
				if line.Type == SECTION && line.Components[0] == sec {
					found = true
					current = line.Lines
					break
				}
			}

			if !found {
				t.Errorf("[%d] key '%s' not found\n", i, strings.Join(test.SectionChain[:s+1], "/"))
				break
			}

		}

	}
}

func TestReceiverAndSyntaxErrors(t *testing.T) {
	tests := []struct {
		Receiver interface{}
		Input    string
		Err      error
	}{
		{new(Line), "", nil},
		{nil, "", ErrNullReceiver},
		{[]byte{}, "", ErrInvalidReceiver},

		{new(Line), "}", &LineError{0, ErrUnexpectedSectionClose}},
		{new(Line), "key valuewithoutsemicolon", &LineError{0, ErrInvalidSyntax}},
		{new(Line), "section {\nkey value;", ErrUnclosedSection},
	}

	for i, test := range tests {

		// create reader
		r := strings.NewReader(test.Input)

		// parse input
		var receiver interface{} = test.Receiver
		decoder := NewDecoder(r)
		err := decoder.Decode(receiver)
		if err == nil {
			if test.Err != nil {
				t.Errorf("[%d] expected error", i)
			}
			continue
		}

		if err.Error() != test.Err.Error() {
			t.Errorf("[%d] expected error <%s>, got <%s>", i, test.Err, err)
			continue
		}

	}
}

var readerError = errors.New("error")

type defectiveReader struct{}

func (d defectiveReader) Read(buf []byte) (int, error) {
	return 0, readerError
}
func TestReadErrors(t *testing.T) {

	// create reader
	r := &defectiveReader{}

	// parse input
	receiver := new(Line)
	decoder := NewDecoder(r)
	err := decoder.Decode(receiver)
	if err == nil {
		t.Fatalf("expected error")
	}

	if err.Error() != (&LineError{0, readerError}).Error() {
		t.Fatalf("expected error <%s>, got <%s>", &LineError{0, readerError}, err)
	}

}