from __future__ import absolute_import
import os, sys, copy
import urwid
from . import common, grideditor, contentview, signals, searchable
from .. import utils, flow, controller
from ..protocol.http import HTTPRequest, HTTPResponse, CONTENT_MISSING, decoded


class SearchError(Exception): pass


def _mkhelp():
    text = []
    keys = [
        ("A", "accept all intercepted flows"),
        ("a", "accept this intercepted flow"),
        ("b", "save request/response body"),
        ("d", "delete flow"),
        ("D", "duplicate flow"),
        ("e", "edit request/response"),
        ("f", "load full body data"),
        ("g", "copy response(content/headers) to clipboard"),
        ("m", "change body display mode for this entity"),
            (None,
                common.highlight_key("automatic", "a") +
                [("text", ": automatic detection")]
            ),
            (None,
                common.highlight_key("hex", "e") +
                [("text", ": Hex")]
            ),
            (None,
                common.highlight_key("html", "h") +
                [("text", ": HTML")]
            ),
            (None,
                common.highlight_key("image", "i") +
                [("text", ": Image")]
            ),
            (None,
                common.highlight_key("javascript", "j") +
                [("text", ": JavaScript")]
            ),
            (None,
                common.highlight_key("json", "s") +
                [("text", ": JSON")]
            ),
            (None,
                common.highlight_key("urlencoded", "u") +
                [("text", ": URL-encoded data")]
            ),
            (None,
                common.highlight_key("raw", "r") +
                [("text", ": raw data")]
            ),
            (None,
                common.highlight_key("xml", "x") +
                [("text", ": XML")]
            ),
        ("M", "change default body display mode"),
        ("p", "previous flow"),
        ("r", "replay request"),
        ("V", "revert changes to request"),
        ("v", "view body in external viewer"),
        ("w", "save all flows matching current limit"),
        ("W", "save this flow"),
        ("x", "delete body"),
        ("X", "view flow details"),
        ("z", "encode/decode a request/response"),
        ("tab", "toggle request/response view"),
        ("space", "next flow"),
        ("|", "run script on this flow"),
        ("/", "search in response body (case sensitive)"),
        ("n", "repeat search forward"),
        ("N", "repeat search backwards"),
    ]
    text.extend(common.format_keyvals(keys, key="key", val="text", indent=4))
    return text
help_context = _mkhelp()

footer = [
    ('heading_key', "?"), ":help ",
    ('heading_key', "q"), ":back ",
]


class FlowViewHeader(urwid.WidgetWrap):
    def __init__(self, master, f):
        self.master, self.flow = master, f
        self._w = common.format_flow(
            f,
            False,
            extended=True,
            padding=0,
            hostheader=self.master.showhost
        )
        signals.flow_change.connect(self.sig_flow_change)

    def sig_flow_change(self, sender, flow):
        if flow == self.flow:
            self._w = common.format_flow(
                flow,
                False,
                extended=True,
                padding=0,
                hostheader=self.master.showhost
            )


cache = utils.LRUCache(200)


class FlowView(urwid.WidgetWrap):
    highlight_color = "focusfield"

    def __init__(self, master, state, flow):
        self.master, self.state, self.flow = master, state, flow
        self.last_displayed_body = None
        if self.state.view_flow_mode == common.VIEW_FLOW_RESPONSE:
            self.view_response()
        else:
            self.view_request()
        signals.flow_change.connect(self.sig_flow_change)

    def sig_flow_change(self, sender, flow):
        if flow == self.flow:
            if self.state.view_flow_mode == common.VIEW_FLOW_RESPONSE and self.flow.response:
                self.view_response()
            else:
                self.view_request()

    def content_view(self, viewmode, conn):
        if conn.content == CONTENT_MISSING:
            msg, body = "", [urwid.Text([("error", "[content missing]")])]
            return (msg, body)
        else:
            full = self.state.get_flow_setting(
                self.flow,
                (self.state.view_flow_mode, "fullcontents"),
                False
            )
            if full:
                limit = sys.maxint
            else:
                limit = contentview.VIEW_CUTOFF
            description, text_objects = cache.get(
                        contentview.get_content_view,
                        viewmode,
                        tuple(tuple(i) for i in conn.headers.lst),
                        conn.content,
                        limit,
                        self.master.add_event,
                        isinstance(conn, HTTPRequest)
                    )
            return (description, text_objects)

    def viewmode_get(self, override):
        return self.state.default_body_view if override is None else override

    def override_get(self):
        return self.state.get_flow_setting(self.flow,
                (self.state.view_flow_mode, "prettyview"))

    def conn_text_raw(self, conn):
        """
            Based on a request/response, conn, returns the elements for
            display.
        """
        headers = common.format_keyvals(
                [(h+":", v) for (h, v) in conn.headers.lst],
                key = "header",
                val = "text"
            )
        override = self.override_get()
        viewmode = self.viewmode_get(override)
        msg, body = self.content_view(viewmode, conn)
        return headers, msg, body

    def conn_text_merge(self, headers, msg, body):
        """
            Grabs what is returned by conn_text_raw and merges them all
            toghether, mainly used by conn_text
        """
        override = self.override_get()
        viewmode = self.viewmode_get(override)

        cols = [urwid.Text(
                [
                    ("heading", msg),
                ]
            )
        ]

        if override is not None:
            cols.append(urwid.Text([
                        " ",
                        ('heading', "["),
                        ('heading_key', "m"),
                        ('heading', (":%s]"%viewmode.name)),
                    ],
                    align="right"
                )
            )

        title = urwid.AttrWrap(urwid.Columns(cols), "heading")
        headers.append(title)
        headers.extend(body)

        return headers

    def conn_text(self, conn):
        """
        Same as conn_text_raw, but returns result wrapped in a listbox ready for
        usage.
        """
        headers, msg, body = self.conn_text_raw(conn)
        merged = self.conn_text_merge(headers, msg, body)
        return searchable.Searchable(merged)

    def _tab(self, content, attr):
        p = urwid.Text(content)
        p = urwid.Padding(p, align="left", width=("relative", 100))
        p = urwid.AttrWrap(p, attr)
        return p

    def wrap_body(self, active, body):
        parts = []

        if self.flow.intercepted and not self.flow.reply.acked and not self.flow.response:
            qt = "Request intercepted"
        else:
            qt = "Request"
        if active == common.VIEW_FLOW_REQUEST:
            parts.append(self._tab(qt, "heading"))
        else:
            parts.append(self._tab(qt, "heading_inactive"))

        if self.flow.intercepted and not self.flow.reply.acked and self.flow.response:
            st = "Response intercepted"
        else:
            st = "Response"
        if active == common.VIEW_FLOW_RESPONSE:
            parts.append(self._tab(st, "heading"))
        else:
            parts.append(self._tab(st, "heading_inactive"))

        h = urwid.Columns(parts)
        f = urwid.Frame(
                    body,
                    header=h
                )
        return f

    def view_request(self):
        self.state.view_flow_mode = common.VIEW_FLOW_REQUEST
        body = self.conn_text(self.flow.request)
        self._w = self.wrap_body(common.VIEW_FLOW_REQUEST, body)

    def view_response(self):
        self.state.view_flow_mode = common.VIEW_FLOW_RESPONSE
        if self.flow.response:
            body = self.conn_text(self.flow.response)
        else:
            body = searchable.Searchable(
                        [
                            urwid.Text(""),
                            urwid.Text(
                                [
                                    ("highlight", "No response. Press "),
                                    ("key", "e"),
                                    ("highlight", " and edit any aspect to add one."),
                                ]
                            )
                        ]
                   )
        self._w = self.wrap_body(common.VIEW_FLOW_RESPONSE, body)

    def set_method_raw(self, m):
        if m:
            self.flow.request.method = m
            signals.flow_change.send(self, flow = self.flow)

    def edit_method(self, m):
        if m == "e":
            signals.status_prompt.send(
                prompt = "Method",
                text = self.flow.request.method,
                callback = self.set_method_raw
            )
        else:
            for i in common.METHOD_OPTIONS:
                if i[1] == m:
                    self.flow.request.method = i[0].upper()
            signals.flow_change.send(self, flow = self.flow)

    def set_url(self, url):
        request = self.flow.request
        try:
            request.url = str(url)
        except ValueError:
            return "Invalid URL."
        signals.flow_change.send(self, flow = self.flow)

    def set_resp_code(self, code):
        response = self.flow.response
        try:
            response.code = int(code)
        except ValueError:
            return None
        import BaseHTTPServer
        if BaseHTTPServer.BaseHTTPRequestHandler.responses.has_key(int(code)):
            response.msg = BaseHTTPServer.BaseHTTPRequestHandler.responses[int(code)][0]
        signals.flow_change.send(self, flow = self.flow)

    def set_resp_msg(self, msg):
        response = self.flow.response
        response.msg = msg
        signals.flow_change.send(self, flow = self.flow)

    def set_headers(self, lst, conn):
        conn.headers = flow.ODictCaseless(lst)
        signals.flow_change.send(self, flow = self.flow)

    def set_query(self, lst, conn):
        conn.set_query(flow.ODict(lst))
        signals.flow_change.send(self, flow = self.flow)

    def set_path_components(self, lst, conn):
        conn.set_path_components([i[0] for i in lst])
        signals.flow_change.send(self, flow = self.flow)

    def set_form(self, lst, conn):
        conn.set_form_urlencoded(flow.ODict(lst))
        signals.flow_change.send(self, flow = self.flow)

    def edit_form(self, conn):
        self.master.view_grideditor(
            grideditor.URLEncodedFormEditor(
                self.master,
                conn.get_form_urlencoded().lst,
                self.set_form,
                conn
            )
        )

    def edit_form_confirm(self, key, conn):
        if key == "y":
            self.edit_form(conn)

    def edit(self, part):
        if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
            message = self.flow.request
        else:
            if not self.flow.response:
                self.flow.response = HTTPResponse(
                    self.flow.request.httpversion,
                    200, "OK", flow.ODictCaseless(), ""
                )
                self.flow.response.reply = controller.DummyReply()
            message = self.flow.response

        self.flow.backup()
        if part == "r":
            with decoded(message):
                # Fix an issue caused by some editors when editing a
                # request/response body. Many editors make it hard to save a
                # file without a terminating newline on the last line. When
                # editing message bodies, this can cause problems. For now, I
                # just strip the newlines off the end of the body when we return
                # from an editor.
                c = self.master.spawn_editor(message.content or "")
                message.content = c.rstrip("\n")
        elif part == "f":
            if not message.get_form_urlencoded() and message.content:
                signals.status_prompt_onekey.send(
                    prompt = "Existing body is not a URL-encoded form. Clear and edit?",
                    keys = [
                        ("yes", "y"),
                        ("no", "n"),
                    ],
                    callback = self.edit_form_confirm,
                    args = (message,)
                )
            else:
                self.edit_form(message)
        elif part == "h":
            self.master.view_grideditor(
                grideditor.HeaderEditor(
                    self.master,
                    message.headers.lst,
                    self.set_headers,
                    message
                )
            )
        elif part == "p":
            p = message.get_path_components()
            p = [[i] for i in p]
            self.master.view_grideditor(
                grideditor.PathEditor(
                    self.master,
                    p,
                    self.set_path_components,
                    message
                )
            )
        elif part == "q":
            self.master.view_grideditor(
                grideditor.QueryEditor(
                    self.master,
                    message.get_query().lst,
                    self.set_query, message
                )
            )
        elif part == "u" and self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
            signals.status_prompt.send(
                prompt = "URL",
                text = message.url,
                callback = self.set_url
            )
        elif part == "m" and self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
            signals.status_prompt_onekey.send(
                prompt = "Method",
                keys = common.METHOD_OPTIONS,
                callback = self.edit_method
            )
        elif part == "c" and self.state.view_flow_mode == common.VIEW_FLOW_RESPONSE:
            signals.status_prompt.send(
                prompt = "Code",
                text = str(message.code),
                callback = self.set_resp_code
            )
        elif part == "m" and self.state.view_flow_mode == common.VIEW_FLOW_RESPONSE:
            signals.status_prompt.send(
                prompt = "Message",
                text = message.msg,
                callback = self.set_resp_msg
            )
        signals.flow_change.send(self, flow = self.flow)

    def _view_nextprev_flow(self, np, flow):
        try:
            idx = self.state.view.index(flow)
        except IndexError:
            return
        if np == "next":
            new_flow, new_idx = self.state.get_next(idx)
        else:
            new_flow, new_idx = self.state.get_prev(idx)
        if new_flow is None:
            signals.status_message.send(message="No more flows!")
        else:
            signals.pop_view_state.send(self)
            self.master.view_flow(new_flow)

    def view_next_flow(self, flow):
        return self._view_nextprev_flow("next", flow)

    def view_prev_flow(self, flow):
        return self._view_nextprev_flow("prev", flow)

    def change_this_display_mode(self, t):
        self.state.add_flow_setting(
            self.flow,
            (self.state.view_flow_mode, "prettyview"),
            contentview.get_by_shortcut(t)
        )
        signals.flow_change.send(self, flow = self.flow)

    def delete_body(self, t):
        if t == "m":
            val = CONTENT_MISSING
        else:
            val = None
        if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
            self.flow.request.content = val
        else:
            self.flow.response.content = val
        signals.flow_change.send(self, flow = self.flow)

    def keypress(self, size, key):
        if key == " ":
            self.view_next_flow(self.flow)
            return

        key = common.shortcuts(key)
        if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
            conn = self.flow.request
        else:
            conn = self.flow.response

        if key == "q":
            signals.pop_view_state.send(self)
            return None
        elif key == "tab":
            if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
                self.view_response()
            else:
                self.view_request()
        elif key in ("up", "down", "page up", "page down"):
            # Why doesn't this just work??
            self._w.keypress(size, key)
        elif key == "a":
            self.flow.accept_intercept(self.master)
            self.master.view_flow(self.flow)
        elif key == "A":
            self.master.accept_all()
            self.master.view_flow(self.flow)
        elif key == "b":
            if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
                common.ask_save_body("q", self.master, self.state, self.flow)
            else:
                common.ask_save_body("s", self.master, self.state, self.flow)
        elif key == "d":
            if self.state.flow_count() == 1:
                self.master.view_flowlist()
            elif self.state.view.index(self.flow) == len(self.state.view)-1:
                self.view_prev_flow(self.flow)
            else:
                self.view_next_flow(self.flow)
            f = self.flow
            f.kill(self.master)
            self.state.delete_flow(f)
        elif key == "D":
            f = self.master.duplicate_flow(self.flow)
            self.master.view_flow(f)
            signals.status_message.send(message="Duplicated.")
        elif key == "e":
            if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
                signals.status_prompt_onekey.send(
                    prompt = "Edit request",
                    keys = (
                        ("query", "q"),
                        ("path", "p"),
                        ("url", "u"),
                        ("header", "h"),
                        ("form", "f"),
                        ("raw body", "r"),
                        ("method", "m"),
                    ),
                    callback = self.edit
                )
            else:
                signals.status_prompt_onekey.send(
                    prompt = "Edit response",
                    keys = (
                        ("code", "c"),
                        ("message", "m"),
                        ("header", "h"),
                        ("raw body", "r"),
                    ),
                    callback = self.edit
                )
            key = None
        elif key == "f":
            signals.status_message.send(message="Loading all body data...")
            self.state.add_flow_setting(
                self.flow,
                (self.state.view_flow_mode, "fullcontents"),
                True
            )
            signals.flow_change.send(self, flow = self.flow)
            signals.status_message.send(message="")
        elif key == "g":
            if self.state.view_flow_mode == common.VIEW_FLOW_REQUEST:
                scope = "q"
            else:
                scope = "s"
            common.ask_copy_part(scope, self.flow, self.master, self.state)
        elif key == "m":
            p = list(contentview.view_prompts)
            p.insert(0, ("Clear", "C"))
            signals.status_prompt_onekey.send(
                self,
                prompt = "Display mode",
                keys = p,
                callback = self.change_this_display_mode
            )
            key = None
        elif key == "p":
            self.view_prev_flow(self.flow)
        elif key == "r":
            r = self.master.replay_request(self.flow)
            if r:
                signals.status_message.send(message=r)
            signals.flow_change.send(self, flow = self.flow)
        elif key == "V":
            if not self.flow.modified():
                signals.status_message.send(message="Flow not modified.")
                return
            self.state.revert(self.flow)
            signals.flow_change.send(self, flow = self.flow)
            signals.status_message.send(message="Reverted.")
        elif key == "W":
            signals.status_prompt_path.send(
                prompt = "Save this flow",
                callback = self.master.save_one_flow,
                args = (self.flow,)
            )
        elif key == "v":
            if conn and conn.content:
                t = conn.headers["content-type"] or [None]
                t = t[0]
                if os.environ.has_key("EDITOR") or os.environ.has_key("PAGER"):
                    self.master.spawn_external_viewer(conn.content, t)
                else:
                    signals.status_message.send(
                        message = "Error! Set $EDITOR or $PAGER."
                    )
        elif key == "|":
            signals.status_prompt_path.send(
                prompt = "Send flow to script",
                callback = self.master.run_script_once,
                args = (self.flow,)
            )
        elif key == "x":
            signals.status_prompt_onekey.send(
                prompt = "Delete body",
                keys = (
                    ("completely", "c"),
                    ("mark as missing", "m"),
                ),
                callback = self.delete_body
            )
            key = None
        elif key == "X":
            self.master.view_flowdetails(self.flow)
        elif key == "z":
            if conn:
                self.flow.backup()
                e = conn.headers.get_first("content-encoding", "identity")
                if e != "identity":
                    if not conn.decode():
                        signals.status_message.send(
                            message = "Could not decode - invalid data?"
                        )
                else:
                    signals.status_prompt_onekey.send(
                        prompt = "Select encoding: ",
                        keys = (
                            ("gzip", "z"),
                            ("deflate", "d"),
                        ),
                        callback = self.encode_callback,
                        args = (conn,)
                    )
                signals.flow_change.send(self, flow = self.flow)
        else:
            return super(self.__class__, self).keypress(size, key)

    def encode_callback(self, key, conn):
        encoding_map = {
            "z": "gzip",
            "d": "deflate",
        }
        conn.encode(encoding_map[key])
        signals.flow_change.send(self, flow = self.flow)