# -*- coding: utf-8 -*-
"""
Sphinx Auto-API Top-level Extension.

This extension allows you to automagically generate API documentation from your project.
"""
import os
import shutil

from sphinx.util.console import darkgreen, bold
from sphinx.addnodes import toctree
from sphinx.errors import SphinxError

from .settings import default_file_mapping, default_ignore_patterns, default_backend_mapping

default_options = ['members', 'undoc-members', 'private-members', 'special-members']


def run_autoapi(app):
    """
    Load AutoAPI data from the filesystem.
    """

    if not app.config.autoapi_dir:
        raise SphinxError('You must configure an autodapi_dir setting')

    # Make sure the paths are full
    if os.path.isabs(app.config.autoapi_dir):
        normalized_dir = app.config.autoapi_dir
    else:
        normalized_dir = os.path.normpath(os.path.join(app.confdir, app.config.autoapi_dir))

    if not os.path.exists(normalized_dir):
        raise SphinxError('AutoAPI Directory not found. Please check your `autoapi_dir` setting.')

    normalized_root = os.path.normpath(os.path.join(app.confdir, app.config.autoapi_root))

    app.env.autoapi_data = []

    domain = default_backend_mapping[app.config.autoapi_type]
    domain_obj = domain(app, template_dir=app.config.autoapi_template_dir)

    if app.config.autoapi_file_patterns:
        file_patterns = app.config.autoapi_file_pattern
    else:
        file_patterns = default_file_mapping.get(app.config.autoapi_type, [])

    if app.config.autoapi_ignore:
        ignore_patterns = app.config.autoapi_ignore
    else:
        ignore_patterns = default_ignore_patterns.get(app.config.autoapi_type, [])

    app.info(bold('[AutoAPI] ') + darkgreen('Loading Data'))
    domain_obj.load(
        patterns=file_patterns,
        dir=normalized_dir,
        ignore=ignore_patterns,
    )

    app.info(bold('[AutoAPI] ') + darkgreen('Mapping Data'))
    domain_obj.map(options=app.config.autoapi_options)

    app.info(bold('[AutoAPI] ') + darkgreen('Rendering Data'))
    domain_obj.output_rst(
        root=normalized_root,
        # TODO: Better way to determine suffix?
        source_suffix=app.config.source_suffix[0],
    )


def build_finished(app, exception):
    if not app.config.autoapi_keep_files:
        normalized_root = os.path.normpath(os.path.join(app.confdir, app.config.autoapi_root))
        if app.verbosity > 1:
            app.info(bold('[AutoAPI] ') + darkgreen('Cleaning generated .rst files'))
        shutil.rmtree(normalized_root)

        mapper = default_backend_mapping[app.config.autoapi_type]
        if hasattr(mapper, 'build_finished'):
            mapper.build_finished(app, exception)


def doctree_read(app, doctree):
    all_docs = set()
    insert = True
    if app.env.docname == 'index':
        nodes = doctree.traverse(toctree)
        if not nodes:
            return
        for node in nodes:
            for entry in node['entries']:
                all_docs.add(entry[1])
        for doc in all_docs:
            if doc.find(app.config.autoapi_root) != -1:
                insert = False
        if insert and app.config.autoapi_add_toctree_entry:
            nodes[-1]['entries'].append(
                (None, u'%s/index' % app.config.autoapi_root)
            )
            nodes[-1]['includefiles'].append(u'%s/index' % app.config.autoapi_root)
            app.info(bold('[AutoAPI] ') + darkgreen('Adding AutoAPI TOCTree to index.rst'))


def setup(app):
    app.connect('builder-inited', run_autoapi)
    app.connect('build-finished', build_finished)
    app.connect('doctree-read', doctree_read)
    app.add_config_value('autoapi_type', 'python', 'html')
    app.add_config_value('autoapi_root', 'autoapi', 'html')
    app.add_config_value('autoapi_ignore', [], 'html')
    app.add_config_value('autoapi_options', default_options, 'html')
    app.add_config_value('autoapi_file_patterns', None, 'html')
    app.add_config_value('autoapi_dir', 'autoapi', 'html')
    app.add_config_value('autoapi_keep_files', False, 'html')
    app.add_config_value('autoapi_add_toctree_entry', True, 'html')
    app.add_config_value('autoapi_template_dir', [], 'html')
    app.add_stylesheet('autoapi.css')