# -*- coding: utf-8 -*-
"""
    sphinx.builders.latex
    ~~~~~~~~~~~~~~~~~~~~~

    LaTeX builder.

    :copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import os
from os import path

from docutils import nodes
from docutils.io import FileOutput
from docutils.utils import new_document
from docutils.frontend import OptionParser

from sphinx import package_dir, addnodes
from sphinx.util import SEP, texescape, copyfile
from sphinx.builders import Builder
from sphinx.environment import NoUri
from sphinx.util.console import bold, darkgreen
from sphinx.writers.latex import LaTeXWriter


class LaTeXBuilder(Builder):
    """
    Builds LaTeX output to create PDF.
    """
    name = 'latex'
    format = 'latex'
    supported_image_types = ['application/pdf', 'image/png',
                             'image/gif', 'image/jpeg']

    def init(self):
        self.docnames = []
        self.document_data = []
        texescape.init()

    def get_outdated_docs(self):
        return 'all documents' # for now

    def get_target_uri(self, docname, typ=None):
        if typ == 'token':
            # token references are always inside production lists and must be
            # replaced by \token{} in LaTeX
            return '@token'
        if docname not in self.docnames:
            raise NoUri
        else:
            return '%' + docname

    def get_relative_uri(self, from_, to, typ=None):
        # ignore source path
        return self.get_target_uri(to, typ)

    def init_document_data(self):
        preliminary_document_data = map(list, self.config.latex_documents)
        if not preliminary_document_data:
            self.warn('no "latex_documents" config value found; no documents '
                      'will be written')
            return
        # assign subdirs to titles
        self.titles = []
        for entry in preliminary_document_data:
            docname = entry[0]
            if docname not in self.env.all_docs:
                self.warn('"latex_documents" config value references unknown '
                          'document %s' % docname)
                continue
            self.document_data.append(entry)
            if docname.endswith(SEP+'index'):
                docname = docname[:-5]
            self.titles.append((docname, entry[2]))

    def write(self, *ignored):
        docwriter = LaTeXWriter(self)
        docsettings = OptionParser(
            defaults=self.env.settings,
            components=(docwriter,)).get_default_values()

        self.init_document_data()

        for entry in self.document_data:
            docname, targetname, title, author, docclass = entry[:5]
            toctree_only = False
            if len(entry) > 5:
                toctree_only = entry[5]
            destination = FileOutput(
                destination_path=path.join(self.outdir, targetname),
                encoding='utf-8')
            self.info("processing " + targetname + "... ", nonl=1)
            doctree = self.assemble_doctree(docname, toctree_only,
                appendices=((docclass == 'manual') and
                            self.config.latex_appendices or []))
            self.post_process_images(doctree)
            self.info("writing... ", nonl=1)
            doctree.settings = docsettings
            doctree.settings.author = author
            doctree.settings.title = title
            doctree.settings.docname = docname
            doctree.settings.docclass = docclass
            try:
                docwriter.write(doctree, destination)
            except UnicodeError:
                self.warn("a Unicode error occurred when writing the output. "
                          "Please make sure all config values that contain "
                          "non-ASCII content are Unicode strings." % pagename)
                return
            self.info("done")

    def assemble_doctree(self, indexfile, toctree_only, appendices):
        self.docnames = set([indexfile] + appendices)
        self.info(darkgreen(indexfile) + " ", nonl=1)
        def process_tree(docname, tree):
            tree = tree.deepcopy()
            for toctreenode in tree.traverse(addnodes.toctree):
                newnodes = []
                includefiles = map(str, toctreenode['includefiles'])
                for includefile in includefiles:
                    try:
                        self.info(darkgreen(includefile) + " ", nonl=1)
                        subtree = process_tree(
                            includefile, self.env.get_doctree(includefile))
                        self.docnames.add(includefile)
                    except Exception:
                        self.warn('toctree contains ref to nonexisting '
                                  'file %r' % includefile,
                                  self.env.doc2path(docname))
                    else:
                        sof = addnodes.start_of_file(docname=includefile)
                        sof.children = subtree.children
                        newnodes.append(sof)
                toctreenode.parent.replace(toctreenode, newnodes)
            return tree
        tree = self.env.get_doctree(indexfile)
        tree['docname'] = indexfile
        if toctree_only:
            # extract toctree nodes from the tree and put them in a
            # fresh document
            new_tree = new_document('<latex output>')
            new_sect = nodes.section()
            new_sect += nodes.title(u'<Set title in conf.py>',
                                    u'<Set title in conf.py>')
            new_tree += new_sect
            for node in tree.traverse(addnodes.toctree):
                new_sect += node
            tree = new_tree
        largetree = process_tree(indexfile, tree)
        largetree['docname'] = indexfile
        for docname in appendices:
            appendix = self.env.get_doctree(docname)
            appendix['docname'] = docname
            largetree.append(appendix)
        self.info()
        self.info("resolving references...")
        self.env.resolve_references(largetree, indexfile, self)
        # resolve :ref:s to distant tex files -- we can't add a cross-reference,
        # but append the document name
        for pendingnode in largetree.traverse(addnodes.pending_xref):
            docname = pendingnode['refdocname']
            sectname = pendingnode['refsectname']
            newnodes = [nodes.emphasis(sectname, sectname)]
            for subdir, title in self.titles:
                if docname.startswith(subdir):
                    newnodes.append(nodes.Text(_(' (in '), _(' (in ')))
                    newnodes.append(nodes.emphasis(title, title))
                    newnodes.append(nodes.Text(')', ')'))
                    break
            else:
                pass
            pendingnode.replace_self(newnodes)
        return largetree

    def finish(self):
        # copy image files
        if self.images:
            self.info(bold('copying images...'), nonl=1)
            for src, dest in self.images.iteritems():
                self.info(' '+src, nonl=1)
                copyfile(path.join(self.srcdir, src),
                         path.join(self.outdir, dest))
            self.info()

        # copy additional files
        if self.config.latex_additional_files:
            self.info(bold('copying additional files...'), nonl=1)
            for filename in self.config.latex_additional_files:
                self.info(' '+filename, nonl=1)
                copyfile(path.join(self.confdir, filename),
                         path.join(self.outdir, path.basename(filename)))
            self.info()

        # the logo is handled differently
        if self.config.latex_logo:
            logobase = path.basename(self.config.latex_logo)
            copyfile(path.join(self.confdir, self.config.latex_logo),
                     path.join(self.outdir, logobase))

        self.info(bold('copying TeX support files... '), nonl=True)
        staticdirname = path.join(package_dir, 'texinputs')
        for filename in os.listdir(staticdirname):
            if not filename.startswith('.'):
                copyfile(path.join(staticdirname, filename),
                         path.join(self.outdir, filename))
        self.info('done')
