# -----------------------------------------------------------------------------
# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
# -----------------------------------------------------------------------------
""" Make javascript code blocks also include a live link to codepen.io for instant experiementation.

This directive takes a title to use for the codepen example:

.. code-block:: rest

    .. bokehjs-content::
        :title: Some Code

        alert('this is called in the codepen');

This directive is identical to the standard ``code-block`` directive
that Sphinx supplies, with the addition of one new option:

title : string
    A title for the codepen.
js_file : string
    location of javascript source file
include_html: string
    if present, this code block will be emitted as a complete HTML template with
    js inside a script block
disable_codepen: string
    if present, this code block will not have a 'try on codepen' button.  Currently
    necessary when 'include_html' is turned on.

Examples
--------

The inline example code above produces the following output:

.. bokehjs-content::
    :title: Some Code

    alert('this is called in the codepen');

"""

# -----------------------------------------------------------------------------
# Boilerplate
# -----------------------------------------------------------------------------
from __future__ import annotations

import logging  # isort:skip

log = logging.getLogger(__name__)

# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------

# Standard library imports
from os.path import basename, join

# External imports
from docutils import nodes
from docutils.parsers.rst.directives import unchanged
from sphinx.directives.code import CodeBlock, container_wrapper, dedent_lines
from sphinx.errors import SphinxError
from sphinx.locale import __
from sphinx.util import logging, parselinenos
from sphinx.util.nodes import set_source_info

# Bokeh imports
from . import PARALLEL_SAFE
from .templates import (
    BJS_CODEPEN_INIT,
    BJS_EPILOGUE,
    BJS_HTML,
    BJS_PROLOGUE,
)
from .util import get_sphinx_resources

# -----------------------------------------------------------------------------
# Globals and constants
# -----------------------------------------------------------------------------

__all__ = (
    "bokehjs_content",
    "BokehJSContent",
    "setup",
)

# -----------------------------------------------------------------------------
# General API
# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# Dev API
# -----------------------------------------------------------------------------


class bokehjs_content(nodes.General, nodes.Element):

    @staticmethod
    def visit_html(visitor, node):
        if node["include_bjs_header"]:
            # we only want to inject the CODEPEN_INIT on one bokehjs-content block per page
            resources = get_sphinx_resources(include_bokehjs_api=True)
            visitor.body.append(BJS_CODEPEN_INIT.render(css_files=resources.css_files, js_files=resources.js_files))

        visitor.body.append(BJS_PROLOGUE.render(id=node["target_id"], title=node["title"]))

    @staticmethod
    def depart_html(visitor, node):
        visitor.body.append(BJS_EPILOGUE.render(title=node["title"], enable_codepen=not node["disable_codepen"], js_source=node["js_source"]))

    html = visit_html.__func__, depart_html.__func__


class BokehJSContent(CodeBlock):

    has_content = True
    optional_arguments = 1
    required_arguments = 0

    option_spec = CodeBlock.option_spec
    option_spec.update(title=unchanged)
    option_spec.update(js_file=unchanged)
    option_spec.update(include_html=unchanged)
    option_spec.update(disable_codepen=unchanged)

    def get_codeblock_node(self, code, language):
        """this is copied from sphinx.directives.code.CodeBlock.run

        it has been changed to accept code and language as an arguments instead
        of reading from self

        """

        document = self.state.document
        location = self.state_machine.get_source_and_line(self.lineno)

        linespec = self.options.get("emphasize-lines")
        if linespec:
            try:
                nlines = len(code.split("\n"))
                hl_lines = parselinenos(linespec, nlines)
                if any(i >= nlines for i in hl_lines):
                    emph_lines = self.options["emphasize-lines"]
                    log.warning(__(f"line number spec is out of range(1-{nlines}): {emph_lines!r}"), location=location)

                hl_lines = [x + 1 for x in hl_lines if x < nlines]
            except ValueError as err:
                return [document.reporter.warning(str(err), line=self.lineno)]
        else:
            hl_lines = None

        if "dedent" in self.options:
            location = self.state_machine.get_source_and_line(self.lineno)
            lines = code.split("\n")
            lines = dedent_lines(lines, self.options["dedent"], location=location)
            code = "\n".join(lines)

        literal = nodes.literal_block(code, code)
        literal["language"] = language
        literal["linenos"] = "linenos" in self.options or "lineno-start" in self.options
        literal["classes"] += self.options.get("class", [])
        extra_args = literal["highlight_args"] = {}
        if hl_lines is not None:
            extra_args["hl_lines"] = hl_lines
        if "lineno-start" in self.options:
            extra_args["linenostart"] = self.options["lineno-start"]
        set_source_info(self, literal)

        caption = self.options.get("caption")
        if caption:
            try:
                literal = container_wrapper(self, literal, caption)
            except ValueError as exc:
                return [document.reporter.warning(str(exc), line=self.lineno)]

        # literal will be note_implicit_target that is linked from caption and numref.
        # when options['name'] is provided, it should be primary ID.
        self.add_name(literal)

        return [literal]

    def get_js_source(self):
        js_file = self.options.get("js_file", False)
        # js_file *or* js code content, but not both
        if js_file and self.content:
            raise SphinxError("bokehjs-content:: directive can't have both js_file and content")

        if js_file:
            log.debug(f"[bokehjs-content] handling external example in {self.env.docname!r}: {js_file}")
            path = js_file
            if not js_file.startswith("/"):
                path = join(self.env.app.srcdir, path)
            js_source = open(path).read()
        else:
            log.debug(f"[bokehjs-content] handling inline example in {self.env.docname!r}")
            js_source = "\n".join(self.content)

        return js_source

    def get_code_language(self):
        """
        This is largely copied from bokeh.sphinxext.bokeh_plot.run
        """
        js_source = self.get_js_source()
        if self.options.get("include_html", False):
            resources = get_sphinx_resources(include_bokehjs_api=True)
            html_source = BJS_HTML.render(css_files=resources.css_files, js_files=resources.js_files, hashes=resources.hashes, bjs_script=js_source)
            return [html_source, "html"]
        else:
            return [js_source, "javascript"]

    def run(self):
        rst_source = self.state_machine.node.document["source"]
        rst_filename = basename(rst_source)

        serial_no = self.env.new_serialno("ccb")
        target_id = f"{rst_filename}.ccb-{serial_no}"
        target_id = target_id.replace(".", "-")
        target_node = nodes.target("", "", ids=[target_id])

        node = bokehjs_content()
        node["target_id"] = target_id
        node["title"] = self.options.get("title", "bokehjs example")
        node["include_bjs_header"] = False
        node["disable_codepen"] = self.options.get("disable_codepen", False)
        node["js_source"] = self.get_js_source()

        source_doc = self.state_machine.node.document
        if not hasattr(source_doc, "bjs_seen"):
            # we only want to inject the CODEPEN_INIT on one
            # bokehjs-content block per page, here we check to see if
            # bjs_seen exists, if not set it to true, and set
            # node['include_bjs_header'] to true.  This way the
            # CODEPEN_INIT is only injected once per document (html
            # page)
            source_doc.bjs_seen = True
            node["include_bjs_header"] = True
        code_content, language = self.get_code_language()
        cb = self.get_codeblock_node(code_content, language)
        node.setup_child(cb[0])
        node.children.append(cb[0])
        return [target_node, node]


def setup(app):
    """ Required Sphinx extension setup function. """
    app.add_node(bokehjs_content, html=bokehjs_content.html)
    app.add_directive("bokehjs-content", BokehJSContent)

    return PARALLEL_SAFE

# -----------------------------------------------------------------------------
# Private API
# -----------------------------------------------------------------------------

# -----------------------------------------------------------------------------
# Code
# -----------------------------------------------------------------------------