import os
import hashlib
import gzip
from xml.dom import *

class DynastieGenerator:

    URI = "http://indefero.soutade.fr/p/dynastie"
    report = ''

    def __init__(self):
        self.report = ''

    def addReport(self, string, color=''):
        if color != '':
            self.report = self.report + '<span style="color:' + color + '">'
        self.report = self.report + '<b>' + self.__class__.__name__ + '</b> : '
        self.report = self.report + string
        if color != '':
            self.report = self.report + '</span>'
        self.report = self.report + '<br/>\n'

    def addWarning(self, string):
        self.addReport(string, 'yellow')

    def addError(self, string):
        self.addReport(string, 'red')

    def generate(self, blog, src, output):
        return

    def writeIfNotTheSame(self, filename, content):
        if os.path.exists(filename):
            src_md5 = hashlib.md5()
            f = open(filename,'rb') 
            src_md5.update(f.read())
            f.close()

            dst_md5 = hashlib.md5()
            dst_md5.update(content)

            if src_md5.digest() == dst_md5.digest():
                self.addReport(filename + ' regenerated with the same content, skipping...')
                filename = filename + '.gz'
                if not os.path.exists(filename):
                    self.addReport(filename + ' was not previously compressed')
                    f = gzip.open(filename, 'wb')
                    f.write(content)
                    f.close()
                return
            os.unlink(filename)

        self.addReport('Write ' + filename)
        f = open(filename,'wb') 
        f.write(content)
        f.close()

        filename = filename + '.gz'
        self.addReport('Compressing it ' + filename)
        f = gzip.open(filename, 'wb')
        f.write(content)
        f.close()

    def createElement(self, dom, name, content):
        div = dom.createElement('div')
        div.setAttribute('class', name)
        div.appendChild(dom.createTextNode(content))

        return div

    def simpleTransform(self, values, dom, elem, root):
        for node in root.childNodes:
            if node.prefix == 'dyn':
                if node.localName in values:
                    new_elem = self.createElement(dom, node.localName, values[node.localName])
                    elem.appendChild(new_elem)
            else:
                elem.appendChild(node.cloneNode(True))