rendering

def delete_all_processed_jobs():
    """Delete all processed jobs"""
    bmr_project = get_current_resolve_project()
    if not _PROCESSING_JOBS:
        return

    for job_id in _PROCESSING_JOBS:
        bmr_project.DeleteRenderJob(job_id)

    _PROCESSING_JOBS.clear()

def is_rendering_in_progress():
    """Check if rendering is in progress"""
    bmr_project = get_current_resolve_project()
    if not bmr_project:
        return False

    return bmr_project.IsRenderingInProgress()

def modify_preset_file(
    xml_path: Path,
    staging_dir: Path,
    data: dict,
) -> Path:
    """Copy *xml_path* to *staging_dir* and apply *data* overrides.

    Each key in *data* is either a bare element tag name (e.g.
    ``"NumFramesOfHandles"``) or a slash-separated path expression (e.g.
    ``"Parent/Child"``).

    * **Bare name** – every matching element in the document is updated.
    * **Path** – the leaf element at the given path is updated; if absent
      it is created as the first child of its parent element.

    Args:
        xml_path (Path): Source XML preset file.
        staging_dir (Path): Directory where the modified copy is written.
        data (dict): Mapping of XML tag / path → new text value.

    Returns:
        Path: Path to the modified copy of the preset in *staging_dir*.

    Raises:
        AttributeError: Logged as a warning when a bare tag is not found.
    """
    temp_path = staging_dir / xml_path.name

    # Read raw text upfront so we can extract the prolog (XML declaration +
    # any prolog-level comments).  Python's ElementTree parser drops prolog
    # comments silently; we preserve them by re-attaching the prolog to the
    # written output.
    raw_text = xml_path.read_text(encoding="utf-8")
    prolog = _extract_prolog(raw_text)

    # insert_comments=True preserves comments that live *inside* elements.
    parser = ET.XMLParser(target=ET.TreeBuilder(insert_comments=True))
    tree = ET.parse(xml_path, parser=parser)

    for key, value in data.items():
        log.debug(f"Setting {key} to {value}")
        try:
            if "/" in key:
                # Normalise to a descendant XPath expression.
                xpath = key if key.startswith("./") else f".//{key}"

                *parent_parts, leaf = xpath.split("/")
                parent_path = "/".join(parent_parts)

                parent = tree.find(parent_path)
                element = parent.find(leaf)
                if element is None:
                    _append_element(parent, leaf, value)
                else:
                    log.debug(f"Setting string 1 {key} to {value}")
                    element.text = str(value)
            else:
                elements = tree.findall(f".//{key}")
                if not elements:
                    raise AttributeError(key)
                for element in elements:
                    log.debug(f"Setting string 2 {key} to {value}")
                    element.text = str(value)
        except AttributeError:
            log.warning(f"Cannot set '{key}': tag not found. Skipping.")

    # Write the modified element tree as unicode text (no xml_declaration —
    # the original prolog, which already contains the declaration and any
    # prolog-level comments, is prepended directly).
    buf = io.StringIO()
    tree.write(buf, encoding="unicode", xml_declaration=False)
    temp_path.write_text(prolog + buf.getvalue(), encoding="utf-8")

    return temp_path

def render_all_timelines(target_render_directory):
    """Render all of the timelines of current project.

    Args:
        target_render_directory (Path): Path to target render directory

    Returns:
        bool: True if all renders are successful, False otherwise
    """
    bmr_project = get_current_resolve_project()
    with maintain_page_by_name("Deliver"):
        timelineCount = bmr_project.GetTimelineCount()
        all_timelines = [
            bmr_project.GetTimelineByIndex(index + 1)
            for index in range(0, int(timelineCount))
        ]
        return _render_timelines(all_timelines, target_render_directory)

def render_clip_to_intermediate_file(
    timeline_item: resolve.TimelineItem,
    target_render_directory: Path
) -> Path | list[Path]:
    """Render a single TimelineItem's range on the currently active timeline.

    Uses the render settings already configured on the project (format, codec,
    preset). Caller is responsible for setting those up before calling this
    function (e.g. via ``set_render_preset_from_file`` and
    ``set_format_and_codec``).

    Args:
        timeline_item: A Resolve ``TimelineItem`` object from the active timeline.
        target_render_directory (Path): Directory where rendered files are written.

    Returns:
        Path: Single file path for container formats (QuickTime, MXF, …).
        list[Path]: Sorted list of frame paths for image sequences (EXR, DPX, …).

    Raises:
        RuntimeError: If the render job cannot be created, started, or completes
            with a non-"Complete" status, or if no output files are found.
    """
    bmr_project = get_current_resolve_project()
    media_pool_item = timeline_item.GetMediaPoolItem()

    render_settings = {
        "SelectAllFrames": False,
        "MarkIn":    timeline_item.GetStart(),
        "MarkOut":   timeline_item.GetEnd() - 1,
        "TargetDir": target_render_directory.as_posix(),
        "CustomName": timeline_item.GetName(),
        "FrameRate": float(media_pool_item.GetClipProperty("FPS")),
    }
    log.info(f"Clip render settings: {pformat(render_settings)}")

    if not bmr_project.SetRenderSettings(render_settings):
        raise RuntimeError("SetRenderSettings failed for clip render.")

    with _solo_video_track(timeline_item):
        job_id = bmr_project.AddRenderJob()
        if not job_id:
            raise RuntimeError("AddRenderJob failed for clip render.")

        log.info(f"Clip render job created: {job_id}")
        try:
            if not bmr_project.StartRendering([job_id], isInteractiveMode=False):
                raise RuntimeError(f"StartRendering failed for job '{job_id}'.")
            wait_for_rendering_completion()

            status = bmr_project.GetRenderJobStatus(job_id)
            if status.get("JobStatus") != "Complete":
                raise RuntimeError(
                    f"Clip render job '{job_id}' did not complete: {status}"
                )
        finally:
            log.info(f"Deleting clip render job: {job_id}")
            bmr_project.DeleteRenderJob(job_id)

    rendered = _collect_rendered_files(target_render_directory)
    if not rendered:
        msg = f"No rendered files found in '{target_render_directory}'."
        raise RuntimeError(msg)

    if rendered[0].suffix.lstrip(".").lower() in _IMAGE_SEQUENCE_EXTS:
        log.info("Clip rendered as image sequence: %d frames", len(rendered))
        return rendered  # list[Path]

    log.info("Clip rendered as single file: %s", rendered[0])
    return rendered[0]  # Path

def render_single_timeline(timeline, target_render_directory):
    """Render single timeline

    Process is taking a defined timeline and render it to temporary
    intermediate file which will be lately used by Extract Review plugin
    for conversion to review file.

    Args:
        timeline (resolve.Timeline): Timeline object
        target_render_directory (Path): Path to target render directory

    Returns:
        bool: True if rendering is successful, False otherwise
    """
    return _render_timelines([timeline], target_render_directory)

def render_timeline_intermediate_file(
    timeline: resolve.Timeline,
    target_render_directory: Path,
    preset_path: Path,
    file_format: str,
    codec: str,
) -> Path | list[Path]:
    """Render *timeline* to an intermediate file in *target_render_directory*.

    Args:
        timeline: Active Resolve Timeline object.
        target_render_directory (Path): Staging directory for the output.
        preset_path (Path): Path to the render preset XML file.
        file_format (str): Resolve format name (e.g. ``"QuickTime"``).
        codec (str): Resolve codec name (e.g. ``"H.264"``).

    Returns:
        Path: Path to the rendered file.
        list[Path]: List of paths to the rendered files.

    Raises:
        RuntimeError: If the render preset cannot be loaded, the format and codec
            cannot be set, or the timeline cannot be rendered.
    """
    log.info(f"Rendering timeline to '{target_render_directory}'")

    with maintain_page_by_name("Deliver"):
        if not set_render_preset_from_file(preset_path.as_posix()):
            raise RuntimeError("Unable to load render preset.")

        format_extension = set_format_and_codec(file_format, codec)
        if not format_extension:
            raise RuntimeError("Unable to set render format and codec.")

        if not render_single_timeline(timeline, target_render_directory):
            raise RuntimeError("Unable to render timeline.")

    rendered_files = _collect_rendered_files(
        target_render_directory, f"*.{format_extension}"
    )
    if not rendered_files:
        msg = (
            f"No rendered files with extension '{format_extension}' found "
            f"in '{target_render_directory}'."
        )
        raise RuntimeError(msg)

    if len(rendered_files) > 1:
        return rendered_files

    return rendered_files[0]

def wait_for_rendering_completion():
    """Wait for rendering completion"""
    while is_rendering_in_progress():
        time.sleep(_SLEEP_TIME)
    return