use crate::api::{yaml_free, yaml_malloc};
use crate::externs::{memset, strcmp};
use crate::fmt::WriteToPtr;
use crate::ops::ForceMul as _;
use crate::success::{Success, FAIL, OK};
use crate::yaml::{
    yaml_anchors_t, yaml_char_t, yaml_document_t, yaml_emitter_t, yaml_event_t, yaml_mark_t,
    yaml_node_item_t, yaml_node_pair_t, yaml_node_t, YAML_ALIAS_EVENT, YAML_ANY_ENCODING,
    YAML_DOCUMENT_END_EVENT, YAML_DOCUMENT_START_EVENT, YAML_MAPPING_END_EVENT, YAML_MAPPING_NODE,
    YAML_MAPPING_START_EVENT, YAML_SCALAR_EVENT, YAML_SCALAR_NODE, YAML_SEQUENCE_END_EVENT,
    YAML_SEQUENCE_NODE, YAML_SEQUENCE_START_EVENT, YAML_STREAM_END_EVENT, YAML_STREAM_START_EVENT,
};
use crate::{libc, yaml_document_delete, yaml_emitter_emit, PointerExt};
use core::mem::{size_of, MaybeUninit};
use core::ptr::{self, addr_of_mut};

/// Start a YAML stream.
///
/// This function should be used before yaml_emitter_dump() is called.
pub unsafe fn yaml_emitter_open(emitter: *mut yaml_emitter_t) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    __assert!(!emitter.is_null());
    __assert!(!(*emitter).opened);
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_STREAM_START_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    (*event).data.stream_start.encoding = YAML_ANY_ENCODING;
    if yaml_emitter_emit(emitter, event).fail {
        return FAIL;
    }
    (*emitter).opened = true;
    OK
}

/// Finish a YAML stream.
///
/// This function should be used after yaml_emitter_dump() is called.
pub unsafe fn yaml_emitter_close(emitter: *mut yaml_emitter_t) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    __assert!(!emitter.is_null());
    __assert!((*emitter).opened);
    if (*emitter).closed {
        return OK;
    }
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_STREAM_END_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    if yaml_emitter_emit(emitter, event).fail {
        return FAIL;
    }
    (*emitter).closed = true;
    OK
}

/// Emit a YAML document.
///
/// The documen object may be generated using the yaml_parser_load() function or
/// the yaml_document_initialize() function. The emitter takes the
/// responsibility for the document object and destroys its content after it is
/// emitted. The document object is destroyed even if the function fails.
pub unsafe fn yaml_emitter_dump(
    emitter: *mut yaml_emitter_t,
    document: *mut yaml_document_t,
) -> Success {
    let current_block: u64;
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    __assert!(!emitter.is_null());
    __assert!(!document.is_null());
    let fresh0 = addr_of_mut!((*emitter).document);
    *fresh0 = document;
    if !(*emitter).opened {
        if yaml_emitter_open(emitter).fail {
            current_block = 5018439318894558507;
        } else {
            current_block = 15619007995458559411;
        }
    } else {
        current_block = 15619007995458559411;
    }
    match current_block {
        15619007995458559411 => {
            if STACK_EMPTY!((*document).nodes) {
                if yaml_emitter_close(emitter).ok {
                    yaml_emitter_delete_document_and_anchors(emitter);
                    return OK;
                }
            } else {
                __assert!((*emitter).opened);
                let fresh1 = addr_of_mut!((*emitter).anchors);
                *fresh1 = yaml_malloc(
                    (size_of::<yaml_anchors_t>() as libc::c_ulong)
                        .force_mul((*document).nodes.top.c_offset_from((*document).nodes.start)
                            as libc::c_ulong),
                ) as *mut yaml_anchors_t;
                memset(
                    (*emitter).anchors as *mut libc::c_void,
                    0,
                    (size_of::<yaml_anchors_t>() as libc::c_ulong)
                        .force_mul((*document).nodes.top.c_offset_from((*document).nodes.start)
                            as libc::c_ulong),
                );
                memset(
                    event as *mut libc::c_void,
                    0,
                    size_of::<yaml_event_t>() as libc::c_ulong,
                );
                (*event).type_ = YAML_DOCUMENT_START_EVENT;
                (*event).start_mark = mark;
                (*event).end_mark = mark;
                (*event).data.document_start.version_directive = (*document).version_directive;
                (*event).data.document_start.tag_directives.start =
                    (*document).tag_directives.start;
                (*event).data.document_start.tag_directives.end = (*document).tag_directives.end;
                (*event).data.document_start.implicit = (*document).start_implicit;
                if yaml_emitter_emit(emitter, event).ok {
                    yaml_emitter_anchor_node(emitter, 1);
                    if yaml_emitter_dump_node(emitter, 1).ok {
                        memset(
                            event as *mut libc::c_void,
                            0,
                            size_of::<yaml_event_t>() as libc::c_ulong,
                        );
                        (*event).type_ = YAML_DOCUMENT_END_EVENT;
                        (*event).start_mark = mark;
                        (*event).end_mark = mark;
                        (*event).data.document_end.implicit = (*document).end_implicit;
                        if yaml_emitter_emit(emitter, event).ok {
                            yaml_emitter_delete_document_and_anchors(emitter);
                            return OK;
                        }
                    }
                }
            }
        }
        _ => {}
    }
    yaml_emitter_delete_document_and_anchors(emitter);
    FAIL
}

unsafe fn yaml_emitter_delete_document_and_anchors(emitter: *mut yaml_emitter_t) {
    let mut index: libc::c_int;
    if (*emitter).anchors.is_null() {
        yaml_document_delete((*emitter).document);
        let fresh2 = addr_of_mut!((*emitter).document);
        *fresh2 = ptr::null_mut::<yaml_document_t>();
        return;
    }
    index = 0;
    while (*(*emitter).document)
        .nodes
        .start
        .wrapping_offset(index as isize)
        < (*(*emitter).document).nodes.top
    {
        let mut node: yaml_node_t = *(*(*emitter).document)
            .nodes
            .start
            .wrapping_offset(index as isize);
        if !(*(*emitter).anchors.wrapping_offset(index as isize)).serialized {
            yaml_free(node.tag as *mut libc::c_void);
            if node.type_ == YAML_SCALAR_NODE {
                yaml_free(node.data.scalar.value as *mut libc::c_void);
            }
        }
        if node.type_ == YAML_SEQUENCE_NODE {
            STACK_DEL!(node.data.sequence.items);
        }
        if node.type_ == YAML_MAPPING_NODE {
            STACK_DEL!(node.data.mapping.pairs);
        }
        index += 1;
    }
    STACK_DEL!((*(*emitter).document).nodes);
    yaml_free((*emitter).anchors as *mut libc::c_void);
    let fresh6 = addr_of_mut!((*emitter).anchors);
    *fresh6 = ptr::null_mut::<yaml_anchors_t>();
    (*emitter).last_anchor_id = 0;
    let fresh7 = addr_of_mut!((*emitter).document);
    *fresh7 = ptr::null_mut::<yaml_document_t>();
}

unsafe fn yaml_emitter_anchor_node_sub(emitter: *mut yaml_emitter_t, index: libc::c_int) {
    (*((*emitter).anchors).offset((index - 1) as isize)).references += 1;
    if (*(*emitter).anchors.offset((index - 1) as isize)).references == 2 {
        (*emitter).last_anchor_id += 1;
        (*(*emitter).anchors.offset((index - 1) as isize)).anchor = (*emitter).last_anchor_id;
    }
}

unsafe fn yaml_emitter_anchor_node(emitter: *mut yaml_emitter_t, index: libc::c_int) {
    let node: *mut yaml_node_t = (*(*emitter).document)
        .nodes
        .start
        .wrapping_offset(index as isize)
        .wrapping_offset(-1_isize);
    let mut item: *mut yaml_node_item_t;
    let mut pair: *mut yaml_node_pair_t;
    let fresh8 =
        addr_of_mut!((*((*emitter).anchors).wrapping_offset((index - 1) as isize)).references);
    *fresh8 += 1;
    if (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).references == 1 {
        match (*node).type_ {
            YAML_SEQUENCE_NODE => {
                item = (*node).data.sequence.items.start;
                while item < (*node).data.sequence.items.top {
                    yaml_emitter_anchor_node_sub(emitter, *item);
                    item = item.wrapping_offset(1);
                }
            }
            YAML_MAPPING_NODE => {
                pair = (*node).data.mapping.pairs.start;
                while pair < (*node).data.mapping.pairs.top {
                    yaml_emitter_anchor_node_sub(emitter, (*pair).key);
                    yaml_emitter_anchor_node_sub(emitter, (*pair).value);
                    pair = pair.wrapping_offset(1);
                }
            }
            _ => {}
        }
    } else if (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).references == 2 {
        let fresh9 = addr_of_mut!((*emitter).last_anchor_id);
        *fresh9 += 1;
        (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).anchor = *fresh9;
    }
}

unsafe fn yaml_emitter_generate_anchor(
    _emitter: *mut yaml_emitter_t,
    anchor_id: libc::c_int,
) -> *mut yaml_char_t {
    let anchor: *mut yaml_char_t = yaml_malloc(16_u64) as *mut yaml_char_t;
    write!(WriteToPtr::new(anchor), "id{:03}\0", anchor_id);
    anchor
}

unsafe fn yaml_emitter_dump_node(emitter: *mut yaml_emitter_t, index: libc::c_int) -> Success {
    let node: *mut yaml_node_t = (*(*emitter).document)
        .nodes
        .start
        .wrapping_offset(index as isize)
        .wrapping_offset(-1_isize);
    let anchor_id: libc::c_int = (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).anchor;
    let mut anchor: *mut yaml_char_t = ptr::null_mut::<yaml_char_t>();
    if anchor_id != 0 {
        anchor = yaml_emitter_generate_anchor(emitter, anchor_id);
    }
    if (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).serialized {
        return yaml_emitter_dump_alias(emitter, anchor);
    }
    (*(*emitter).anchors.wrapping_offset((index - 1) as isize)).serialized = true;
    match (*node).type_ {
        YAML_SCALAR_NODE => yaml_emitter_dump_scalar(emitter, node, anchor),
        YAML_SEQUENCE_NODE => yaml_emitter_dump_sequence(emitter, node, anchor),
        YAML_MAPPING_NODE => yaml_emitter_dump_mapping(emitter, node, anchor),
        _ => __assert!(false),
    }
}

unsafe fn yaml_emitter_dump_alias(
    emitter: *mut yaml_emitter_t,
    anchor: *mut yaml_char_t,
) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_ALIAS_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    (*event).data.alias.anchor = anchor;
    yaml_emitter_emit(emitter, event)
}

unsafe fn yaml_emitter_dump_scalar(
    emitter: *mut yaml_emitter_t,
    node: *mut yaml_node_t,
    anchor: *mut yaml_char_t,
) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    let plain_implicit = strcmp(
        (*node).tag as *mut libc::c_char,
        b"tag:yaml.org,2002:str\0" as *const u8 as *const libc::c_char,
    ) == 0;
    let quoted_implicit = strcmp(
        (*node).tag as *mut libc::c_char,
        b"tag:yaml.org,2002:str\0" as *const u8 as *const libc::c_char,
    ) == 0;
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_SCALAR_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    (*event).data.scalar.anchor = anchor;
    (*event).data.scalar.tag = (*node).tag;
    (*event).data.scalar.value = (*node).data.scalar.value;
    (*event).data.scalar.length = (*node).data.scalar.length;
    (*event).data.scalar.plain_implicit = plain_implicit;
    (*event).data.scalar.quoted_implicit = quoted_implicit;
    (*event).data.scalar.style = (*node).data.scalar.style;
    yaml_emitter_emit(emitter, event)
}

unsafe fn yaml_emitter_dump_sequence(
    emitter: *mut yaml_emitter_t,
    node: *mut yaml_node_t,
    anchor: *mut yaml_char_t,
) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    let implicit = strcmp(
        (*node).tag as *mut libc::c_char,
        b"tag:yaml.org,2002:seq\0" as *const u8 as *const libc::c_char,
    ) == 0;
    let mut item: *mut yaml_node_item_t;
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_SEQUENCE_START_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    (*event).data.sequence_start.anchor = anchor;
    (*event).data.sequence_start.tag = (*node).tag;
    (*event).data.sequence_start.implicit = implicit;
    (*event).data.sequence_start.style = (*node).data.sequence.style;
    if yaml_emitter_emit(emitter, event).fail {
        return FAIL;
    }
    item = (*node).data.sequence.items.start;
    while item < (*node).data.sequence.items.top {
        if yaml_emitter_dump_node(emitter, *item).fail {
            return FAIL;
        }
        item = item.wrapping_offset(1);
    }
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_SEQUENCE_END_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    yaml_emitter_emit(emitter, event)
}

unsafe fn yaml_emitter_dump_mapping(
    emitter: *mut yaml_emitter_t,
    node: *mut yaml_node_t,
    anchor: *mut yaml_char_t,
) -> Success {
    let mut event = MaybeUninit::<yaml_event_t>::uninit();
    let event = event.as_mut_ptr();
    let mark = yaml_mark_t {
        index: 0_u64,
        line: 0_u64,
        column: 0_u64,
    };
    let implicit = strcmp(
        (*node).tag as *mut libc::c_char,
        b"tag:yaml.org,2002:map\0" as *const u8 as *const libc::c_char,
    ) == 0;
    let mut pair: *mut yaml_node_pair_t;
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_MAPPING_START_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    (*event).data.mapping_start.anchor = anchor;
    (*event).data.mapping_start.tag = (*node).tag;
    (*event).data.mapping_start.implicit = implicit;
    (*event).data.mapping_start.style = (*node).data.mapping.style;
    if yaml_emitter_emit(emitter, event).fail {
        return FAIL;
    }
    pair = (*node).data.mapping.pairs.start;
    while pair < (*node).data.mapping.pairs.top {
        if yaml_emitter_dump_node(emitter, (*pair).key).fail {
            return FAIL;
        }
        if yaml_emitter_dump_node(emitter, (*pair).value).fail {
            return FAIL;
        }
        pair = pair.wrapping_offset(1);
    }
    memset(
        event as *mut libc::c_void,
        0,
        size_of::<yaml_event_t>() as libc::c_ulong,
    );
    (*event).type_ = YAML_MAPPING_END_EVENT;
    (*event).start_mark = mark;
    (*event).end_mark = mark;
    yaml_emitter_emit(emitter, event)
}