import cgi
import logging
import types

#from openerp.tools.safe_eval import safe_eval as eval

import xml   # FIXME use lxml
import xml.dom.minidom

_logger = logging.getLogger(__name__)

class QWebEval(object):
    def __init__(self, data):
        self.data = data

    def __getitem__(self, expr):
        if expr in self.data:
            return self.data[expr]
        r = ''
        try:
            r = eval(expr, self.data)
        except NameError:
            pass
        except AttributeError:
            pass
        except Exception:
            _logger.exception('invalid expression: %r', expr)

        self.data.pop('__builtins__', None)
        return r

    def eval_object(self, expr):
        return self[expr]

    def eval_str(self, expr):
        if expr == "0":
            return self.data.get(0, '')
        if isinstance(self[expr], unicode):
            return self[expr].encode("utf8")
        return str(self[expr])

    def eval_format(self, expr):
        try:
            return str(expr % self)
        except:
            return "qweb: format error '%s' " % expr
#       if isinstance(r,unicode):
#           return r.encode("utf8")

    def eval_bool(self, expr):
        if self.eval_object(expr):
            return 1
        else:
            return 0

class QWebXml(object):
    """QWeb Xml templating engine

    The templating engine use a very simple syntax, "magic" xml attributes, to
    produce any kind of texutal output (even non-xml).

    QWebXml:
        the template engine core implements the basic magic attributes:

        t-att t-raw t-esc t-if t-foreach t-set t-call t-trim


    - loader: function that return a template


    """
    def __init__(self, loader):
        self.loader = loader
        self.node = xml.dom.Node
        self._t = {}
        self._render_tag = {}

        prefix = 'render_tag_'
        for i in [j for j in dir(self) if j.startswith(prefix)]:
            name = i[len(prefix):].replace('_', '-')
            self._render_tag[name] = getattr(self.__class__, i)

        self._render_att = {}
        prefix = 'render_att_'
        for i in [j for j in dir(self) if j.startswith(prefix)]:
            name = i[len(prefix):].replace('_', '-')
            self._render_att[name] = getattr(self.__class__, i)

    def register_tag(self, tag, func):
        self._render_tag[tag] = func

    def add_template(self, x):
        if hasattr(x, 'documentElement'):
            dom = x
        elif x.startswith("<?xml"):
            dom = xml.dom.minidom.parseString(x)
        else:
            dom = xml.dom.minidom.parse(x)
        for n in dom.documentElement.childNodes:
            if n.nodeName == "t":
                self._t[str(n.getAttribute("t-name"))] = n

    def get_template(self, name):
        if name in self._t:
            return self._t[name]
        else:
            xml = self.loader(name)
            self.add_template(xml)
            if name in self._t:
                return self._t[name]
        raise KeyError('qweb: template "%s" not found' % name)

    def eval_object(self, expr, v):
        return QWebEval(v).eval_object(expr)

    def eval_str(self, expr, v):
        return QWebEval(v).eval_str(expr)

    def eval_format(self, expr, v):
        return QWebEval(v).eval_format(expr)

    def eval_bool(self, expr, v):
        return QWebEval(v).eval_bool(expr)

    def render(self, tname, v=None, out=None):
        if v is None:
            v = {}
        return self.render_node(self.get_template(tname), v)

    def render_node(self, e, v):
        r = ""
        if e.nodeType == self.node.TEXT_NODE or e.nodeType == self.node.CDATA_SECTION_NODE:
            r = e.data.encode("utf8")
        elif e.nodeType == self.node.ELEMENT_NODE:
            g_att = ""
            t_render = None
            t_att = {}
            for (an, av) in e.attributes.items():
                an = str(an)
                if isinstance(av, types.UnicodeType):
                    av = av.encode("utf8")
                else:
                    av = av.nodeValue.encode("utf8")
                if an.startswith("t-"):
                    for i in self._render_att:
                        if an[2:].startswith(i):
                            g_att += self._render_att[i](self, e, an, av, v)
                            break
                    else:
                        if an[2:] in self._render_tag:
                            t_render = an[2:]
                        t_att[an[2:]] = av
                else:
                    g_att += ' %s="%s"' % (an, cgi.escape(av, 1))
            if t_render:
                if t_render in self._render_tag:
                    r = self._render_tag[t_render](self, e, t_att, g_att, v)
            else:
                r = self.render_element(e, t_att, g_att, v)
        return r

    def render_element(self, e, t_att, g_att, v, inner=None):
        # e: element
        # t_att: t-* attributes
        # g_att: generated attributes
        # v: values
        # inner: optional innerXml
        if inner:
            g_inner = inner
        else:
            g_inner = []
            for n in e.childNodes:
                g_inner.append(self.render_node(n, v))
        name = str(e.nodeName)
        inner = "".join(g_inner)
        trim = t_att.get("trim", 0)
        if trim == 0:
            pass
        elif trim == 'left':
            inner = inner.lstrip()
        elif trim == 'right':
            inner = inner.rstrip()
        elif trim == 'both':
            inner = inner.strip()
        if name == "t":
            return inner
        elif len(inner) or name in ['script','i','div']:
            # script should be rendered as <script></script>
            return "<%s%s>%s</%s>" % (name, g_att, inner, name)
        else:
            return "<%s%s/>" % (name, g_att)

    # Attributes
    def render_att_att(self, e, an, av, v):
        if an.startswith("t-attf-"):
            att, val = an[7:], self.eval_format(av, v)
        elif an.startswith("t-att-"):
            att, val = an[6:], self.eval_str(av, v)
        else:
            att, val = self.eval_object(av, v)
        return ' %s="%s"' % (att, cgi.escape(val, 1))

    # Tags
    def render_tag_raw(self, e, t_att, g_att, v):
        inner = self.eval_str(t_att["raw"], v)
        return self.render_element(e, t_att,  g_att, v, inner)

    def render_tag_rawf(self, e, t_att, g_att, v):
        inner = self.eval_format(t_att["rawf"], v)
        return self.render_element(e, t_att,  g_att, v, inner)

    def render_tag_esc(self, e, t_att, g_att, v):
        inner = cgi.escape(self.eval_str(t_att["esc"], v))
        return self.render_element(e, t_att,  g_att, v, inner)

    def render_tag_escf(self, e, t_att, g_att, v):
        inner = cgi.escape(self.eval_format(t_att["escf"], v))
        return self.render_element(e, t_att,  g_att, v, inner)

    def render_tag_foreach(self, e, t_att, g_att, v):
        expr = t_att["foreach"]
        enum = self.eval_object(expr, v)
        if enum is not None:
            var = t_att.get('as', expr).replace('.', '_')
            d = v.copy()
            size = -1
            if isinstance(enum, types.ListType):
                size = len(enum)
            elif isinstance(enum, types.TupleType):
                size = len(enum)
            elif hasattr(enum, 'count'):
                size = enum.count()
            d["%s_size" % var] = size
            d["%s_all" % var] = enum
            index = 0
            ru = []
            for i in enum:
                d["%s_value" % var] = i
                d["%s_index" % var] = index
                d["%s_first" % var] = index == 0
                d["%s_even" % var] = index % 2
                d["%s_odd" % var] = (index + 1) % 2
                d["%s_last" % var] = index + 1 == size
                if index % 2:
                    d["%s_parity" % var] = 'odd'
                else:
                    d["%s_parity" % var] = 'even'
                if isinstance(i, types.DictType):
                    d.update(i)
                else:
                    d[var] = i
                ru.append(self.render_element(e, t_att, g_att, d))
                index += 1
            return "".join(ru)
        else:
            return "qweb: t-foreach %s not found." % expr

    def render_tag_if(self, e, t_att, g_att, v):
        if self.eval_bool(t_att["if"], v):
            return self.render_element(e, t_att, g_att, v)
        else:
            return ""

    def render_tag_call(self, e, t_att, g_att, v):
        if "import" in t_att:
            d = v
        else:
            d = v.copy()
        d[0] = self.render_element(e, t_att, g_att, d)
        return self.render(t_att["call"], d)

    def render_tag_set(self, e, t_att, g_att, v):
        if "value" in t_att:
            v[t_att["set"]] = self.eval_object(t_att["value"], v)
        else:
            v[t_att["set"]] = self.render_element(e, t_att, g_att, v)
        return ""

    def render_tag_field(self, e, t_att, g_att, v):
        """ eg: <span t-record="browse_record(res.partner, 1)" t-field="phone">+1 555 555 8069</span>"""

        record, field = t_att["field"].rsplit('.', 1)
        record = self.eval_object(record, v)

        inner = ""
        field_type = record._model._all_columns.get(field).column._type
        try:
            if field_type == 'many2one':
                field = getattr(record, field)
                if field:
                    inner = field.name_get()[0][1] or ""
            else:
                inner = getattr(record, field) or ""
            if isinstance(inner, types.UnicodeType):
                inner = inner.encode("utf8")
            if field_type != 'html':
                cgi.escape(str(inner))
            if e.tagName != 't':
                g_att += ''.join(
                    ' %s="%s"' % (name, cgi.escape(str(value), True))
                    for name, value in [
                        ('data-oe-model', record._model._name),
                        ('data-oe-id', str(record.id)),
                        ('data-oe-field', field),
                        ('data-oe-type', field_type),
                    ]
                )
        except AttributeError:
            _logger.warning("t-field no field %s for model %s", field, record._model._name)

        return self.render_element(e, t_att,  g_att, v, str(inner))

# leave this, al.