#!/usr/bin/env python

import os

import click
from click.formatting import join_options

from sentry.runner import cli as root_command


def get_opts(param):
    any_prefix_is_slash = []

    def _write(opts):
        rv, any_slashes = join_options(opts)
        if any_slashes:
            any_prefix_is_slash[:] = [True]
        if not param.is_flag and not param.count:
            rv += " " + param.make_metavar()
        return rv

    rv = [_write(param.opts)]
    if param.secondary_opts:
        rv.append(_write(param.secondary_opts))
    return (any_prefix_is_slash and "; " or " / ").join(rv)


def write_page(out, data):
    path = data["path"]
    filename = os.path.join(out, *path[1:]) + "/index.rst"
    if len(path) == 1:
        filename += ".inc"

    dirname = os.path.dirname(filename)
    os.makedirs(dirname, exist_ok=True)

    args = [x["metavar"] for x in data["arguments"]]
    title = "`%s`" % " ".join(data["path"] + args)
    body = [title, "-" * len(title), "", data["help"] or ""]

    body.append("")
    body.append("Options")
    body.append("```````")
    body.append("")
    for opt in data["options"]:
        prefix = "- ``%s``: " % opt["opt_string"]
        for line in click.wrap_text(opt["help"], 74, prefix, "  ").splitlines() or [""]:
            body.append(line)
    body.append("- ``--help``: print this help page.")

    if data["subcommands"]:
        body.append("")
        body.append("Subcommands")
        body.append("```````````")
        body.append("")
        body.append(".. toctree::")
        body.append(" :maxdepth: 1")
        body.append("")
        for subcmd in data["subcommands"]:
            body.append(f" {subcmd} <{subcmd}/index>")
        body.append("")

    with open(filename, "w") as f:
        for line in body:
            f.write("%s\n" % line.encode("utf-8"))


class NoHelp(Exception):
    pass


def dump_command(out, cmd, path):
    if cmd.help is None:
        raise NoHelp
    data = {
        "path": path,
        "help": cmd.help.replace("\b", ""),
        "options": [],
        "arguments": [],
        "subcommands": [],
    }

    for param in cmd.params:
        if isinstance(param, click.Option):
            help_text = param.help or ""
            if param.show_default:
                help_text += "  [default: %s]" % (
                    ", ".join("%s" % d for d in param.default)
                    if isinstance(param.default, (list, tuple))
                    else (param.default,)
                )
            data["options"].append({"opt_string": get_opts(param), "help": help_text})
        else:
            data["arguments"].append({"metavar": param.make_metavar()})

    if isinstance(cmd, click.Group):
        for child_name, child_cmd in cmd.commands.items():
            try:
                dump_command(out, child_cmd, path + [child_name])
            except NoHelp:
                pass
            else:
                data["subcommands"].append(child_name)

    write_page(out, data)


@click.command()
@click.option("--output-path", "out", type=click.Path(), default="build/cli-help")
def cli(out):
    dump_command(out, root_command, ["sentry"])


if __name__ == "__main__":
    cli()