# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

import sys

from zope.interface import Interface, Attribute

from twisted.lore import process, indexer, numberer, htmlbook

from twisted.python import usage, reflect
from twisted import plugin as plugin

class IProcessor(Interface):
    """
    """

    name = Attribute("The user-facing name of this processor")

    moduleName = Attribute(
        "The fully qualified Python name of the object defining "
        "this processor.  This object (typically a module) should "
        "have a C{factory} attribute with C{generate_<output>} methods.")


class Options(usage.Options):

    longdesc = "lore converts documentation formats."

    optFlags = [["plain", 'p', "Report filenames without progress bar"],
                ["null", 'n', "Do not report filenames"],
                ["number", 'N', "Add chapter/section numbers to section headings"],
]

    optParameters = [
                     ["input", "i", 'lore'],
                     ["inputext", "e", ".xhtml", "The extension that your Lore input files have"],
                     ["docsdir", "d", None],
                     ["linkrel", "l", ''],
                     ["output", "o", 'html'],
                     ["index", "x", None, "The base filename you want to give your index file"],
                     ["book", "b", None, "The book file to generate a book from"],
                     ["prefixurl", None, "", "The prefix to stick on to relative links; only useful when processing directories"],
                    ]

    compData = usage.Completions(
        extraActions=[usage.CompleteFiles(descr="files", repeat=True)])

    def __init__(self, *args, **kw):
        usage.Options.__init__(self, *args, **kw)
        self.config = {}

    def opt_config(self, s):
        if '=' in s:
            k, v = s.split('=', 1)
            self.config[k] = v
        else:
            self.config[s] = 1

    def parseArgs(self, *files):
        self['files'] = files


def getProcessor(input, output, config):
    plugins = plugin.getPlugins(IProcessor)
    for plug in plugins:
        if plug.name == input:
            module = reflect.namedModule(plug.moduleName)
            break
    else:
        # try treating it as a module name
        try:
            module = reflect.namedModule(input)
        except ImportError:
            print '%s: no such input: %s' % (sys.argv[0], input)
            return
    try:
        return process.getProcessor(module, output, config)
    except process.NoProcessorError, e:
        print "%s: %s" % (sys.argv[0], e)


def getWalker(df, opt):
    klass = process.Walker
    if opt['plain']:
        klass = process.PlainReportingWalker
    if opt['null']:
        klass = process.NullReportingWalker
    return klass(df, opt['inputext'], opt['linkrel'])


def runGivenOptions(opt):
    """Do everything but parse the options; useful for testing.
    Returns a descriptive string if there's an error."""

    book = None
    if opt['book']:
        book = htmlbook.Book(opt['book'])

    df = getProcessor(opt['input'], opt['output'], opt.config)
    if not df:
        return 'getProcessor() failed'

    walker = getWalker(df, opt)

    if opt['files']:
        for filename in opt['files']:
            walker.walked.append(('', filename))
    elif book:
        for filename in book.getFiles():
            walker.walked.append(('', filename))
    else:
        walker.walkdir(opt['docsdir'] or '.', opt['prefixurl'])

    if opt['index']:
        indexFilename = opt['index']
    elif book:
        indexFilename = book.getIndexFilename()
    else:
        indexFilename = None

    if indexFilename:
        indexer.setIndexFilename("%s.%s" % (indexFilename, opt['output']))
    else:
        indexer.setIndexFilename(None)

    ## TODO: get numberSections from book, if any
    numberer.setNumberSections(opt['number'])

    walker.generate()

    if walker.failures:
        for (file, errors) in walker.failures:
            for error in errors:
                print "%s:%s" % (file, error)
        return 'Walker failures'


def run():
    opt = Options()
    try:
        opt.parseOptions()
    except usage.UsageError, errortext:
        print '%s: %s' % (sys.argv[0], errortext)
        print '%s: Try --help for usage details.' % sys.argv[0]
        sys.exit(1)

    result = runGivenOptions(opt)
    if result:
        print result
        sys.exit(1)


if __name__ == '__main__':
    run()