import pathlib
from typing import Any, Optional, Union

import click
import frontmatter

# from .export import *
from keep_exporter.export import (
    LocalNote,
    build_frontmatter,
    build_markdown,
    build_note_unique_path,
    delete_local_only_files,
    download_media,
    index_existing_files,
    login,
    try_rename_note,
)

# import keep_exporter.export as export


def get_click_supplied_value(ctx: click.core.Context, param_name: str) -> Any:
    """
    Find the value passed to Click through the following priority:

    #1 - a parameter passed on the command line
    #2 - a config value passed through @click_config_file
    #3 - None
    """

    # I didn't find in the docs for Click a simpler way to get the
    # parameter if specified, fall back to the default_map if not, None if neither
    # but this feels like a standard thing that should be built-in

    if param_name in ctx.params:
        return ctx.params[param_name]

    if ctx.default_map:
        return ctx.default_map.get(param_name)

    return None


def token_callback_password_or_token(
    ctx: click.core.Context,
    param: Union[click.core.Option, click.core.Parameter],
    value: Any,
) -> Any:
    """
    On the token param (after password), ensure that either a password
    or token were supplied, and if neither was, prompt for the password.
    """
    if value:
        token = value
    else:
        token = get_click_supplied_value(ctx, "token")
    password = get_click_supplied_value(ctx, "password")

    if not token and not password:
        click.echo("Neither password nor token provided. Prompting for password")
        password = click.prompt("Password", hide_input=True)
        ctx.params["password"] = password
        return None

    return token


import click_config_file


@click.command(
    context_settings={"max_content_width": 120, "help_option_names": ["-h", "--help"]}
)
@click_config_file.configuration_option()
@click.option(
    "--user",
    "-u",
    prompt=True,
    required=True,
    envvar="GKEEP_USER",
    show_envvar=True,
    help="Google account email (prompt if empty)",
)
@click.option(
    "--password",
    "-p",
    envvar="GKEEP_PASSWORD",
    show_envvar=True,
    help="Google account password (prompt if empty). Either this or token is required.",
    hide_input=True,
)
@click.option(
    "--token",
    "-t",
    envvar="GKEEP_TOKEN",
    help="Google account token from prior run. Either this or password is required.",
    callback=token_callback_password_or_token,
)
@click.option(
    "--directory",
    "-d",
    default="./gkeep-export",
    show_default=True,
    help="Output directory for exported notes",
    type=click.Path(file_okay=False, dir_okay=True, writable=True),
)
@click.option(
    "--header/--no-header",
    default=True,
    show_default=True,
    help="Choose to include or exclude the frontmatter header",
)
@click.option(
    "--delete-local/--no-delete-local",
    default=False,
    show_default=True,
    help="Choose to delete or leave as-is any notes that exist locally but not in Google Keep",
)
@click.option(
    "--rename-local/--no-rename-local",
    default=False,
    show_default=True,
    help="Choose to rename or leave as-is any notes that change titles in Google Keep",
)
@click.option(
    "--date-format",
    default="%Y-%m-%d",
    show_default=True,
    help="Date format to use for the prefix of the note filenames. Reflects the created date of the note.",
)
@click.option(
    "--skip-existing-media/--no-skip-existing-media",
    default=True,
    show_default=True,
    help="Skip existing media if it appears unchanged from the local copy.",
)
def main(
    directory: str,
    user: str,
    password: Optional[str],
    token: Optional[str],
    header: bool,
    delete_local: bool,
    rename_local: bool,
    date_format: str,
    skip_existing_media: bool,
):
    """A simple utility to export google keep notes to markdown files with metadata stored as a frontmatter header."""
    notepath = pathlib.Path(directory).resolve()
    mediapath = notepath.joinpath("media/")

    click.echo(f"Notes directory: {notepath}")
    click.echo(f"Media directory: {mediapath}")

    keep = login(user, password, token)

    if not notepath.exists():
        click.echo("Notes directory does not exist, creating.")
        notepath.mkdir(parents=True)

    if not mediapath.exists():
        click.echo("Media directory does not exist, creating.")
        mediapath.mkdir(parents=True)

    click.echo("Indexing local files.")
    local_index = index_existing_files(notepath)

    click.echo("Indexing remote notes.")
    keep_notes = dict([(note.id, note) for note in keep.all()])

    skipped_notes, updated_notes, new_notes = 0, 0, 0
    downloaded_media = 0
    deleted_notes, deleted_media = delete_local_only_files(
        local_index, keep_notes, delete_local
    )

    for note in keep_notes.values():  # type: gkeepapi._node.Note
        local_note = local_index.get(note.id)
        if not local_note:
            click.echo(f"Downloading new note {note.id}")
            new_notes += 1

        target_path = build_note_unique_path(notepath, note, date_format, local_index)

        local_path = local_index.get(note.id, LocalNote(note.id)).path
        if local_path:
            if rename_local and local_path != target_path:
                target_path = try_rename_note(local_index[note.id], target_path)
            else:
                target_path = local_path

        # decide to skip after the rename (due to date format change) has a chance
        if local_note:
            if local_note.timestamp_updated == note.timestamps.updated:
                skipped_notes += 1
                continue
            else:
                updated_notes += 1
                click.echo(f"Updating existing file for note {note.id}")

        images, downloaded = download_media(keep, note, mediapath, skip_existing_media)
        markdown = build_markdown(note, images)

        downloaded_media += downloaded

        with target_path.open("wb+") as f:
            if header:
                fmatter = build_frontmatter(note, markdown)
                frontmatter.dump(fmatter, f)
            else:
                f.write(markdown.encode("utf-8"))

    click.echo("Finished syncing.")
    click.echo(
        f"Notes: {skipped_notes} unchanged, {updated_notes} updated, {new_notes} new, {deleted_notes} deleted"
    )
    click.echo(f"Media: {downloaded_media} downloaded, {deleted_media} deleted")


if __name__ == "__main__":
    # pylint: disable=no-value-for-parameter
    main()