"""
A commandline tool for drawing RDFS Class diagrams in Graphviz DOT
format

You can draw the graph of an RDFS file directly:

.. code-block: bash

   rdf2dot my_rdfs_file.rdf | dot -Tpng | display
"""

import collections
import itertools
import sys

import rdflib.extras.cmdlineutils
from rdflib import RDF, RDFS, XSD

XSDTERMS = [
    XSD[x]
    for x in (
        "anyURI",
        "base64Binary",
        "boolean",
        "byte",
        "date",
        "dateTime",
        "decimal",
        "double",
        "duration",
        "float",
        "gDay",
        "gMonth",
        "gMonthDay",
        "gYear",
        "gYearMonth",
        "hexBinary",
        "ID",
        "IDREF",
        "IDREFS",
        "int",
        "integer",
        "language",
        "long",
        "Name",
        "NCName",
        "negativeInteger",
        "NMTOKEN",
        "NMTOKENS",
        "nonNegativeInteger",
        "nonPositiveInteger",
        "normalizedString",
        "positiveInteger",
        "QName",
        "short",
        "string",
        "time",
        "token",
        "unsignedByte",
        "unsignedInt",
        "unsignedLong",
        "unsignedShort",
    )
]

EDGECOLOR = "blue"
NODECOLOR = "black"
ISACOLOR = "black"


def rdfs2dot(g, stream, opts={}):
    """
    Convert the RDFS schema in a graph
    writes the dot output to the stream
    """

    fields = collections.defaultdict(set)
    nodes = {}

    def node(nd):
        if nd not in nodes:
            nodes[nd] = "node%d" % len(nodes)
        return nodes[nd]

    def label(xx, grf):
        lbl = grf.value(xx, RDFS.label)
        if lbl is None:
            try:
                lbl = grf.namespace_manager.compute_qname(xx)[2]
            except Exception:
                pass  # bnodes and some weird URIs cannot be split
        return lbl

    stream.write('digraph { \n node [ fontname="DejaVu Sans" ] ; \n')

    for x in g.subjects(RDF.type, RDFS.Class):
        n = node(x)

    for x, y in g.subject_objects(RDFS.subClassOf):
        x = node(x)
        y = node(y)
        stream.write("\t%s -> %s [ color=%s ] ;\n" % (y, x, ISACOLOR))

    for x in g.subjects(RDF.type, RDF.Property):
        for a, b in itertools.product(
            g.objects(x, RDFS.domain), g.objects(x, RDFS.range)
        ):
            if b in XSDTERMS or b == RDFS.Literal:
                l_ = label(b, g)
                if b == RDFS.Literal:
                    l_ = "literal"
                fields[node(a)].add((label(x, g), l_))
            else:
                #            if a in nodes and b in nodes:
                stream.write(
                    '\t%s -> %s [ color=%s, label="%s" ];\n'
                    % (node(a), node(b), EDGECOLOR, label(x, g))
                )

    for u, n in nodes.items():
        stream.write("# %s %s\n" % (u, n))
        f = [
            "<tr><td align='left'>%s</td><td>%s</td></tr>" % x
            for x in sorted(fields[n])
        ]
        opstr = (
            "%s [ shape=none, color=%s label=< <table color='#666666'"
            + " cellborder='0' cellspacing='0' border='1'><tr>"
            + "<td colspan='2' bgcolor='grey'><B>%s</B></td>"
            + "</tr>%s</table> > ] \n"
        )
        stream.write(opstr % (n, NODECOLOR, label(u, g), "".join(f)))

    stream.write("}\n")


def _help():
    sys.stderr.write(
        """
rdfs2dot.py [-f <format>] files...
Read RDF files given on STDOUT, writes a graph of the RDFS schema in
DOT language to stdout
-f specifies parser to use, if not given,

"""
    )


def main():
    rdflib.extras.cmdlineutils.main(rdfs2dot, _help)


if __name__ == "__main__":
    main()
