#! @PYTHON@

from datetime import date
import getopt
import os
import re
import sys
import xml.dom.minidom

import ovs.json
from ovs.db import error
import ovs.db.schema

argv0 = sys.argv[0]

def textToNroff(s, font=r'\fR'):
    def escape(match):
        c = match.group(0)
        if c == '-':
            if font == r'\fB':
                return r'\-'
            else:
                return '-'
        if c == '\\':
            return r'\e'
        elif c == '"':
            return r'\(dq'
        elif c == "'":
            return r'\(cq'
        else:
            raise error.Error("bad escape")

    # Escape - \ " ' as needed by nroff.
    s = re.sub('([-"\'\\\\])', escape, s)
    if s.startswith('.'):
        s = '\\' + s
    return s

def escapeNroffLiteral(s):
    return r'\fB%s\fR' % textToNroff(s, r'\fB')

def inlineXmlToNroff(node, font):
    if node.nodeType == node.TEXT_NODE:
        return textToNroff(node.data, font)
    elif node.nodeType == node.ELEMENT_NODE:
        if node.tagName in ['code', 'em', 'option']:
            s = r'\fB'
            for child in node.childNodes:
                s += inlineXmlToNroff(child, r'\fB')
            return s + font
        elif node.tagName == 'ref':
            s = r'\fB'
            if node.hasAttribute('column'):
                s += node.attributes['column'].nodeValue
            elif node.hasAttribute('table'):
                s += node.attributes['table'].nodeValue
            elif node.hasAttribute('group'):
                s += node.attributes['group'].nodeValue
            else:
                raise error.Error("'ref' lacks column and table attributes")
            return s + font
        elif node.tagName == 'var':
            s = r'\fI'
            for child in node.childNodes:
                s += inlineXmlToNroff(child, r'\fI')
            return s + font
        else:
            raise error.Error("element <%s> unknown or invalid here" % node.tagName)
    else:
        raise error.Error("unknown node %s in inline xml" % node)

def blockXmlToNroff(nodes, para='.PP'):
    s = ''
    for node in nodes:
        if node.nodeType == node.TEXT_NODE:
            s += textToNroff(node.data)
            s = s.lstrip()
        elif node.nodeType == node.ELEMENT_NODE:
            if node.tagName in ['ul', 'ol']:
                if s != "":
                    s += "\n"
                s += ".RS\n"
                i = 0
                for liNode in node.childNodes:
                    if (liNode.nodeType == node.ELEMENT_NODE
                        and liNode.tagName == 'li'):
                        i += 1
                        if node.tagName == 'ul':
                            s += ".IP \\bu\n"
                        else:
                            s += ".IP %d. .25in\n" % i
                        s += blockXmlToNroff(liNode.childNodes, ".IP")
                    elif (liNode.nodeType != node.TEXT_NODE
                          or not liNode.data.isspace()):
                        raise error.Error("<%s> element may only have <li> children" % node.tagName)
                s += ".RE\n"
            elif node.tagName == 'dl':
                if s != "":
                    s += "\n"
                s += ".RS\n"
                prev = "dd"
                for liNode in node.childNodes:
                    if (liNode.nodeType == node.ELEMENT_NODE
                        and liNode.tagName == 'dt'):
                        if prev == 'dd':
                            s += '.TP\n'
                        else:
                            s += '.TQ\n'
                        prev = 'dt'
                    elif (liNode.nodeType == node.ELEMENT_NODE
                          and liNode.tagName == 'dd'):
                        if prev == 'dd':
                            s += '.IP\n'
                        prev = 'dd'
                    elif (liNode.nodeType != node.TEXT_NODE
                          or not liNode.data.isspace()):
                        raise error.Error("<dl> element may only have <dt> and <dd> children")
                    s += blockXmlToNroff(liNode.childNodes, ".IP")
                s += ".RE\n"
            elif node.tagName == 'p':
                if s != "":
                    if not s.endswith("\n"):
                        s += "\n"
                    s += para + "\n"
                s += blockXmlToNroff(node.childNodes, para)
            else:
                s += inlineXmlToNroff(node, r'\fR')
        else:
            raise error.Error("unknown node %s in block xml" % node)
    if s != "" and not s.endswith('\n'):
        s += '\n'
    return s

def typeAndConstraintsToNroff(column):
    type = column.type.toEnglish(escapeNroffLiteral)
    constraints = column.type.constraintsToEnglish(escapeNroffLiteral)
    if constraints:
        type += ", " + constraints
    return type

def columnToNroff(columnName, column, node):
    type = typeAndConstraintsToNroff(column)
    s = '.IP "\\fB%s\\fR: %s"\n' % (columnName, type)
    s += blockXmlToNroff(node.childNodes, '.IP') + "\n"
    return s

def columnGroupToNroff(table, groupXml):
    introNodes = []
    columnNodes = []
    for node in groupXml.childNodes:
        if (node.nodeType == node.ELEMENT_NODE
            and node.tagName in ('column', 'group')):
            columnNodes += [node]
        else:
            introNodes += [node]

    summary = []
    intro = blockXmlToNroff(introNodes)
    body = ''
    for node in columnNodes:
        if node.tagName == 'column':
            columnName = node.attributes['name'].nodeValue
            column = table.columns[columnName]
            body += columnToNroff(columnName, column, node)
            summary += [('column', columnName, column)]
        elif node.tagName == 'group':
            title = node.attributes["title"].nodeValue
            subSummary, subIntro, subBody = columnGroupToNroff(table, node)
            summary += [('group', title, subSummary)]
            body += '.ST "%s:"\n' % textToNroff(title)
            body += subIntro + subBody
        else:
            raise error.Error("unknown element %s in <table>" % node.tagName)
    return summary, intro, body

def tableSummaryToNroff(summary, level=0):
    s = ""
    for type, name, arg in summary:
        if type == 'column':
            
            s += "%s\\fB%s\\fR\tT{\n%s\nT}\n" % (
                r'\ \ ' * level, name, typeAndConstraintsToNroff(arg))
        else:
            if s != "":
                s += "_\n"
            s += """.T&
li | s
l | l.
%s%s
_
""" % (r'\ \ ' * level, name)
            s += tableSummaryToNroff(arg, level + 1)
    return s

def tableToNroff(schema, tableXml):
    tableName = tableXml.attributes['name'].nodeValue
    table = schema.tables[tableName]

    s = """.bp
.SS "%s Table"
""" % tableName
    summary, intro, body = columnGroupToNroff(table, tableXml)
    s += intro

    s += r"""
.sp
.ce 1
\fB%s\fR Table Columns:
.TS
center box;
l | l.
Column	Type
=
""" % tableName
    s += tableSummaryToNroff(summary)
    s += ".TE\n"

    s += body
    return s

def docsToNroff(schemaFile, xmlFile, erFile, title=None):
    schema = ovs.db.schema.DbSchema.from_json(ovs.json.from_file(schemaFile))
    doc = xml.dom.minidom.parse(xmlFile).documentElement
    
    schemaDate = os.stat(schemaFile).st_mtime
    xmlDate = os.stat(xmlFile).st_mtime
    d = date.fromtimestamp(max(schemaDate, xmlDate))
    
    if title == None:
        title = schema.name

    # Putting '\" pt as the first line tells "man" that the manpage
    # needs to be preprocessed by "pic" and "tbl".
    s = r''''\" pt
.TH %s 5 "%s" "Open vSwitch" "Open vSwitch Manual"
.\" -*- nroff -*-
.de TQ
.  br
.  ns
.  TP "\\$1"
..
.de ST
.  PP
.  RS -0.15in
.  I "\\$1"
.  RE
..
''' % (title, d.strftime("%B %Y"))

    s += '.SH "%s DATABASE"\n' % schema.name

    tables = ""
    introNodes = []
    tableNodes = []
    summary = []
    for dbNode in doc.childNodes:
        if (dbNode.nodeType == dbNode.ELEMENT_NODE
            and dbNode.tagName == "table"):
            tableNodes += [dbNode]

            name = dbNode.attributes['name'].nodeValue
            if dbNode.hasAttribute("title"):
                title = dbNode.attributes['title'].nodeValue
            else:
                title = name + " configuration."
            summary += [(name, title)]
        else:
            introNodes += [dbNode]

    s += blockXmlToNroff(introNodes) + "\n"
    tableSummary = r"""
.sp
.ce 1
\fB%s\fR Database Tables:
.TS
center box;
l | l
lb | l.
Table	Purpose
=
""" % schema.name
    for name, title in summary:
        tableSummary += "%s\t%s\n" % (name, textToNroff(title))
    tableSummary += '.TE\n'
    s += tableSummary

    if erFile:
        s += """
.sp 1
.SH "TABLE RELATIONSHIPS"
.PP
The following diagram shows the relationship among tables in the
database.  Each node represents a table.  Each edge leads from the
table that contains it and points to the table that its value
represents.  Edges are labeled with their column names.
.RS -1in
"""
        erStream = open(erFile, "r")
        for line in erStream:
            s += line + '\n'
        erStream.close()
        s += ".RE\n"

    for node in tableNodes:
        s += tableToNroff(schema, node) + "\n"
    return s

def usage():
    print """\
%(argv0)s: ovsdb schema documentation generator
Prints documentation for an OVSDB schema as an nroff-formatted manpage.
usage: %(argv0)s [OPTIONS] SCHEMA XML
where SCHEMA is an OVSDB schema in JSON format
  and XML is OVSDB documentation in XML format.

The following options are also available:
  --er-diagram=DIAGRAM.PIC    include E-R diagram from DIAGRAM.PIC
  --title=TITLE               use TITLE as title instead of schema name
  -h, --help                  display this help message
  -V, --version               display version information\
""" % {'argv0': argv0}
    sys.exit(0)

if __name__ == "__main__":
    try:
        try:
            options, args = getopt.gnu_getopt(sys.argv[1:], 'hV',
                                              ['er-diagram=', 'title=',
                                               'help', 'version'])
        except getopt.GetoptError, geo:
            sys.stderr.write("%s: %s\n" % (argv0, geo.msg))
            sys.exit(1)

        er_diagram = None
        title = None
        for key, value in options:
            if key == '--er-diagram':
                er_diagram = value
            elif key == '--title':
                title = value
            elif key in ['-h', '--help']:
                usage()
            elif key in ['-V', '--version']:
                print "ovsdb-doc (Open vSwitch) @VERSION@"
            else:
                sys.exit(0)
            
        if len(args) != 2:
            sys.stderr.write("%s: exactly 2 non-option arguments required "
                             "(use --help for help)\n" % argv0)
            sys.exit(1)
        
        # XXX we should warn about undocumented tables or columns
        s = docsToNroff(args[0], args[1], er_diagram)
        for line in s.split("\n"):
            line = line.strip()
            if len(line):
                print line
            
    except error.Error, e:
        sys.stderr.write("%s: %s\n" % (argv0, e.msg))
        sys.exit(1)

# Local variables:
# mode: python
# End: