package yaml

import (

	"io"

)

func yaml_insert_token(parser *yaml_parser_t, pos int, token *yaml_token_t) {

	//fmt.Println("yaml_insert_token", "pos:", pos, "typ:", token.typ, "head:", parser.tokens_head, "len:", len(parser.tokens))

	// Check if we can move the queue at the beginning of the buffer.

	if parser.tokens_head > 0 && len(parser.tokens) == cap(parser.tokens) {

		if parser.tokens_head != len(parser.tokens) {

			copy(parser.tokens, parser.tokens[parser.tokens_head:])

		}

		parser.tokens = parser.tokens[:len(parser.tokens)-parser.tokens_head]

		parser.tokens_head = 0

	}

	parser.tokens = append(parser.tokens, *token)

	if pos < 0 {

		return

	}

	copy(parser.tokens[parser.tokens_head+pos+1:], parser.tokens[parser.tokens_head+pos:])

	parser.tokens[parser.tokens_head+pos] = *token

}

// Create a new parser object.

func yaml_parser_initialize(parser *yaml_parser_t) bool {

	*parser = yaml_parser_t{

		raw_buffer: make([]byte, 0, input_raw_buffer_size),

		buffer:     make([]byte, 0, input_buffer_size),

	}

	return true

}

// Destroy a parser object.

func yaml_parser_delete(parser *yaml_parser_t) {

	*parser = yaml_parser_t{}

}

// String read handler.

func yaml_string_read_handler(parser *yaml_parser_t, buffer []byte) (n int, err error) {

	if parser.input_pos == len(parser.input) {

		return 0, io.EOF

	}

	n = copy(buffer, parser.input[parser.input_pos:])

	parser.input_pos += n

	return n, nil

}

// Reader read handler.

func yaml_reader_read_handler(parser *yaml_parser_t, buffer []byte) (n int, err error) {

	return parser.input_reader.Read(buffer)

}

// Set a string input.

func yaml_parser_set_input_string(parser *yaml_parser_t, input []byte) {

	if parser.read_handler != nil {

		panic("must set the input source only once")

	}

	parser.read_handler = yaml_string_read_handler

	parser.input = input

	parser.input_pos = 0

}

// Set a file input.

func yaml_parser_set_input_reader(parser *yaml_parser_t, r io.Reader) {

	if parser.read_handler != nil {

		panic("must set the input source only once")

	}

	parser.read_handler = yaml_reader_read_handler

	parser.input_reader = r

}

// Set the source encoding.

func yaml_parser_set_encoding(parser *yaml_parser_t, encoding yaml_encoding_t) {

	if parser.encoding != yaml_ANY_ENCODING {

		panic("must set the encoding only once")

	}

	parser.encoding = encoding

}

var disableLineWrapping = false

// Create a new emitter object.

func yaml_emitter_initialize(emitter *yaml_emitter_t) {

	*emitter = yaml_emitter_t{

		buffer:     make([]byte, output_buffer_size),

		raw_buffer: make([]byte, 0, output_raw_buffer_size),

		states:     make([]yaml_emitter_state_t, 0, initial_stack_size),

		events:     make([]yaml_event_t, 0, initial_queue_size),

	}

	if disableLineWrapping {

		emitter.best_width = -1

	}

}

// Destroy an emitter object.

func yaml_emitter_delete(emitter *yaml_emitter_t) {

	*emitter = yaml_emitter_t{}

}

// String write handler.

func yaml_string_write_handler(emitter *yaml_emitter_t, buffer []byte) error {

	*emitter.output_buffer = append(*emitter.output_buffer, buffer...)

	return nil

}

// yaml_writer_write_handler uses emitter.output_writer to write the

// emitted text.

func yaml_writer_write_handler(emitter *yaml_emitter_t, buffer []byte) error {

	_, err := emitter.output_writer.Write(buffer)

	return err

}

// Set a string output.

func yaml_emitter_set_output_string(emitter *yaml_emitter_t, output_buffer *[]byte) {

	if emitter.write_handler != nil {

		panic("must set the output target only once")

	}

	emitter.write_handler = yaml_string_write_handler

	emitter.output_buffer = output_buffer

}

// Set a file output.

func yaml_emitter_set_output_writer(emitter *yaml_emitter_t, w io.Writer) {

	if emitter.write_handler != nil {

		panic("must set the output target only once")

	}

	emitter.write_handler = yaml_writer_write_handler

	emitter.output_writer = w

}

// Set the output encoding.

func yaml_emitter_set_encoding(emitter *yaml_emitter_t, encoding yaml_encoding_t) {

	if emitter.encoding != yaml_ANY_ENCODING {

		panic("must set the output encoding only once")

	}

	emitter.encoding = encoding

}

// Set the canonical output style.

func yaml_emitter_set_canonical(emitter *yaml_emitter_t, canonical bool) {

	emitter.canonical = canonical

}

//// Set the indentation increment.

func yaml_emitter_set_indent(emitter *yaml_emitter_t, indent int) {

	if indent < 2 || indent > 9 {

		indent = 2

	}

	emitter.best_indent = indent

}

// Set the preferred line width.

func yaml_emitter_set_width(emitter *yaml_emitter_t, width int) {

	if width < 0 {

		width = -1

	}

	emitter.best_width = width

}

// Set if unescaped non-ASCII characters are allowed.

func yaml_emitter_set_unicode(emitter *yaml_emitter_t, unicode bool) {

	emitter.unicode = unicode

}

// Set the preferred line break character.

func yaml_emitter_set_break(emitter *yaml_emitter_t, line_break yaml_break_t) {

	emitter.line_break = line_break

}

///*

// * Destroy a token object.

// */

//

//YAML_DECLARE(void)

//yaml_token_delete(yaml_token_t *token)

//{

//    assert(token);  // Non-NULL token object expected.

//

//    switch (token.type)

//    {

//        case YAML_TAG_DIRECTIVE_TOKEN:

//            yaml_free(token.data.tag_directive.handle);

//            yaml_free(token.data.tag_directive.prefix);

//            break;

//

//        case YAML_ALIAS_TOKEN:

//            yaml_free(token.data.alias.value);

//            break;

//

//        case YAML_ANCHOR_TOKEN:

//            yaml_free(token.data.anchor.value);

//            break;

//

//        case YAML_TAG_TOKEN:

//            yaml_free(token.data.tag.handle);

//            yaml_free(token.data.tag.suffix);

//            break;

//

//        case YAML_SCALAR_TOKEN:

//            yaml_free(token.data.scalar.value);

//            break;

//

//        default:

//            break;

//    }

//

//    memset(token, 0, sizeof(yaml_token_t));

//}

//

///*

// * Check if a string is a valid UTF-8 sequence.

// *

// * Check 'reader.c' for more details on UTF-8 encoding.

// */

//

//static int

//yaml_check_utf8(yaml_char_t *start, size_t length)

//{

//    yaml_char_t *end = start+length;

//    yaml_char_t *pointer = start;

//

//    while (pointer < end) {

//        unsigned char octet;

//        unsigned int width;

//        unsigned int value;

//        size_t k;

//

//        octet = pointer[0];

//        width = (octet & 0x80) == 0x00 ? 1 :

//                (octet & 0xE0) == 0xC0 ? 2 :

//                (octet & 0xF0) == 0xE0 ? 3 :

//                (octet & 0xF8) == 0xF0 ? 4 : 0;

//        value = (octet & 0x80) == 0x00 ? octet & 0x7F :

//                (octet & 0xE0) == 0xC0 ? octet & 0x1F :

//                (octet & 0xF0) == 0xE0 ? octet & 0x0F :

//                (octet & 0xF8) == 0xF0 ? octet & 0x07 : 0;

//        if (!width) return 0;

//        if (pointer+width > end) return 0;

//        for (k = 1; k < width; k ++) {

//            octet = pointer[k];

//            if ((octet & 0xC0) != 0x80) return 0;

//            value = (value << 6) + (octet & 0x3F);

//        }

//        if (!((width == 1) ||

//            (width == 2 && value >= 0x80) ||

//            (width == 3 && value >= 0x800) ||

//            (width == 4 && value >= 0x10000))) return 0;

//

//        pointer += width;

//    }

//

//    return 1;

//}

//

// Create STREAM-START.

func yaml_stream_start_event_initialize(event *yaml_event_t, encoding yaml_encoding_t) {

	*event = yaml_event_t{

		typ:      yaml_STREAM_START_EVENT,

		encoding: encoding,

	}

}

// Create STREAM-END.

func yaml_stream_end_event_initialize(event *yaml_event_t) {

	*event = yaml_event_t{

		typ: yaml_STREAM_END_EVENT,

	}

}

// Create DOCUMENT-START.

func yaml_document_start_event_initialize(

	event *yaml_event_t,

	version_directive *yaml_version_directive_t,

	tag_directives []yaml_tag_directive_t,

	implicit bool,

) {

	*event = yaml_event_t{

		typ:               yaml_DOCUMENT_START_EVENT,

		version_directive: version_directive,

		tag_directives:    tag_directives,

		implicit:          implicit,

	}

}

// Create DOCUMENT-END.

func yaml_document_end_event_initialize(event *yaml_event_t, implicit bool) {

	*event = yaml_event_t{

		typ:      yaml_DOCUMENT_END_EVENT,

		implicit: implicit,

	}

}

///*

// * Create ALIAS.

// */

//

//YAML_DECLARE(int)

//yaml_alias_event_initialize(event *yaml_event_t, anchor *yaml_char_t)

//{

//    mark yaml_mark_t = { 0, 0, 0 }

//    anchor_copy *yaml_char_t = NULL

//

//    assert(event) // Non-NULL event object is expected.

//    assert(anchor) // Non-NULL anchor is expected.

//

//    if (!yaml_check_utf8(anchor, strlen((char *)anchor))) return 0

//

//    anchor_copy = yaml_strdup(anchor)

//    if (!anchor_copy)

//        return 0

//

//    ALIAS_EVENT_INIT(*event, anchor_copy, mark, mark)

//

//    return 1

//}

// Create SCALAR.

func yaml_scalar_event_initialize(event *yaml_event_t, anchor, tag, value []byte, plain_implicit, quoted_implicit bool, style yaml_scalar_style_t) bool {

	*event = yaml_event_t{

		typ:             yaml_SCALAR_EVENT,

		anchor:          anchor,

		tag:             tag,

		value:           value,

		implicit:        plain_implicit,

		quoted_implicit: quoted_implicit,

		style:           yaml_style_t(style),

	}

	return true

}

// Create SEQUENCE-START.

func yaml_sequence_start_event_initialize(event *yaml_event_t, anchor, tag []byte, implicit bool, style yaml_sequence_style_t) bool {

	*event = yaml_event_t{

		typ:      yaml_SEQUENCE_START_EVENT,

		anchor:   anchor,

		tag:      tag,

		implicit: implicit,

		style:    yaml_style_t(style),

	}

	return true

}

// Create SEQUENCE-END.

func yaml_sequence_end_event_initialize(event *yaml_event_t) bool {

	*event = yaml_event_t{

		typ: yaml_SEQUENCE_END_EVENT,

	}

	return true

}

// Create MAPPING-START.

func yaml_mapping_start_event_initialize(event *yaml_event_t, anchor, tag []byte, implicit bool, style yaml_mapping_style_t) {

	*event = yaml_event_t{

		typ:      yaml_MAPPING_START_EVENT,

		anchor:   anchor,

		tag:      tag,

		implicit: implicit,

		style:    yaml_style_t(style),

	}

}

// Create MAPPING-END.

func yaml_mapping_end_event_initialize(event *yaml_event_t) {

	*event = yaml_event_t{

		typ: yaml_MAPPING_END_EVENT,

	}

}

// Destroy an event object.

func yaml_event_delete(event *yaml_event_t) {

	*event = yaml_event_t{}

}

///*

// * Create a document object.

// */

//

//YAML_DECLARE(int)

//yaml_document_initialize(document *yaml_document_t,

//        version_directive *yaml_version_directive_t,

//        tag_directives_start *yaml_tag_directive_t,

//        tag_directives_end *yaml_tag_directive_t,

//        start_implicit int, end_implicit int)

//{

//    struct {

//        error yaml_error_type_t

//    } context

//    struct {

//        start *yaml_node_t

//        end *yaml_node_t

//        top *yaml_node_t

//    } nodes = { NULL, NULL, NULL }

//    version_directive_copy *yaml_version_directive_t = NULL

//    struct {

//        start *yaml_tag_directive_t

//        end *yaml_tag_directive_t

//        top *yaml_tag_directive_t

//    } tag_directives_copy = { NULL, NULL, NULL }

//    value yaml_tag_directive_t = { NULL, NULL }

//    mark yaml_mark_t = { 0, 0, 0 }

//

//    assert(document) // Non-NULL document object is expected.

//    assert((tag_directives_start && tag_directives_end) ||

//            (tag_directives_start == tag_directives_end))

//                            // Valid tag directives are expected.

//

//    if (!STACK_INIT(&context, nodes, INITIAL_STACK_SIZE)) goto error

//

//    if (version_directive) {

//        version_directive_copy = yaml_malloc(sizeof(yaml_version_directive_t))

//        if (!version_directive_copy) goto error

//        version_directive_copy.major = version_directive.major

//        version_directive_copy.minor = version_directive.minor

//    }

//

//    if (tag_directives_start != tag_directives_end) {

//        tag_directive *yaml_tag_directive_t

//        if (!STACK_INIT(&context, tag_directives_copy, INITIAL_STACK_SIZE))

//            goto error

//        for (tag_directive = tag_directives_start

//                tag_directive != tag_directives_end; tag_directive ++) {

//            assert(tag_directive.handle)

//            assert(tag_directive.prefix)

//            if (!yaml_check_utf8(tag_directive.handle,

//                        strlen((char *)tag_directive.handle)))

//                goto error

//            if (!yaml_check_utf8(tag_directive.prefix,

//                        strlen((char *)tag_directive.prefix)))

//                goto error

//            value.handle = yaml_strdup(tag_directive.handle)

//            value.prefix = yaml_strdup(tag_directive.prefix)

//            if (!value.handle || !value.prefix) goto error

//            if (!PUSH(&context, tag_directives_copy, value))

//                goto error

//            value.handle = NULL

//            value.prefix = NULL

//        }

//    }

//