from collections.abc import Callable

from papis.document import Document

from papis_extract.annotation import Annotation

Formatter = Callable[[Document, list[Annotation]], str]


def format_markdown(
    document: Document = Document(),
    annotations: list[Annotation] = [],
    headings: str = "setext",  # setext | atx | None
) -> str:
    if not annotations:
        return ""
    template = (
        "{{#tag}}#{{tag}}\n{{/tag}}"
        "{{#quote}}> {{quote}}{{/quote}}{{#page}} [p. {{page}}]{{/page}}"
        "{{#note}}\n  NOTE: {{note}}{{/note}}"
    )
    output = ""

    heading = f"{document.get('title', '')} - {document.get('author', '')}"
    if headings == "atx":
        output += f"# {heading}\n\n"
    elif headings == "setext":
        title_decoration = (
            f"{'=' * len(document.get('title', ''))}   "
            f"{'-' * len(document.get('author', ''))}"
        )
        output += f"{title_decoration}\n{heading}\n{title_decoration}\n\n"

    for a in annotations:
        output += a.format(template)
        output += "\n\n"

    output += "\n\n\n"

    return output.rstrip()


def format_markdown_atx(
    document: Document = Document(),
    annotations: list[Annotation] = [],
) -> str:
    return format_markdown(document, annotations, headings="atx")


def format_markdown_setext(
    document: Document = Document(),
    annotations: list[Annotation] = [],
) -> str:
    return format_markdown(document, annotations, headings="setext")


def format_count(
    document: Document = Document(),
    annotations: list[Annotation] = [],
) -> str:
    if not annotations:
        return ""

    count = 0
    for _ in annotations:
        count += 1

    return (
        f"{count} "
        f"{document.get('author', '')}"
        f"{': ' if 'author' in document else ''}"  # only put separator if author
        f"{document.get('title', '')}"
    ).rstrip()


def format_csv(
    document: Document = Document(),
    annotations: list[Annotation] = [],
) -> str:
    header: str = "type,tag,page,quote,note,author,title,ref,file"
    template: str = (
        '{{type}},{{tag}},{{page}},"{{quote}}","{{note}}",'
        '"{{doc.author}}","{{doc.title}}","{{doc.ref}}","{{file}}"'
    )
    output = f"{header}\n"
    if not annotations:
        return ""

    for a in annotations:
        output += a.format(template, doc=document)
        output += "\n"

    return output.rstrip()


formatters: dict[str, Formatter] = {
    "count": format_count,
    "csv": format_csv,
    "markdown": format_markdown,
    "markdown-atx": format_markdown_atx,
    "markdown-setext": format_markdown_setext,
}