import re
import time

from Plugin import PluginManager
from util import RateLimit
from util import helper

if "merger_db" not in locals().keys():  # To keep merger_sites between module reloads
    merger_db = {}  # Sites that allowed to list other sites {address: [type1, type2...]}
    merged_db = {}  # Sites that allowed to be merged to other sites {address: type, ...}
    merged_to_merger = {}  # {address: [site1, site2, ...]} cache
    site_manager = None  # Site manager for merger sites


# Check if the site has permission to this merger site
def checkMergerPath(address, inner_path):
    merged_match = re.match("^merged-(.*?)/([A-Za-z0-9]{26,35})/", inner_path)
    if merged_match:
        merger_type = merged_match.group(1)
        # Check if merged site is allowed to include other sites
        if merger_type in merger_db.get(address, []):
            # Check if included site allows to include
            merged_address = merged_match.group(2)
            if merged_db.get(merged_address) == merger_type:
                inner_path = re.sub("^merged-(.*?)/([A-Za-z0-9]{26,35})/", "", inner_path)
                return merged_address, inner_path
            else:
                raise Exception("Merger site (%s) does not have permission for merged site: %s" % (merger_type, merged_address))
        else:
            raise Exception("No merger (%s) permission to load: <br>%s (%s not in %s)" % (
                address, inner_path, merger_type, merger_db.get(address, []))
            )
    else:
        raise Exception("Invalid merger path: %s" % inner_path)


@PluginManager.registerTo("UiWebsocket")
class UiWebsocketPlugin(object):
    # Download new site
    def actionMergerSiteAdd(self, to, addresses):
        if type(addresses) != list:
            # Single site add
            addresses = [addresses]
        # Check if the site has merger permission
        merger_types = merger_db.get(self.site.address)
        if not merger_types:
            return self.response(to, {"error": "Not a merger site"})

        if RateLimit.isAllowed(self.site.address + "-MergerSiteAdd", 10) and len(addresses) == 1:
            # Without confirmation if only one site address and not called in last 10 sec
            self.cbMergerSiteAdd(to, addresses)
        else:
            self.cmd(
                "confirm",
                ["Add <b>%s</b> new site?" % len(addresses), "Add"],
                lambda (res): self.cbMergerSiteAdd(to, addresses)
            )
        self.response(to, "ok")

    # Callback of adding new site confirmation
    def cbMergerSiteAdd(self, to, addresses):
        added = 0
        for address in addresses:
            added += 1
            site_manager.need(address)
        if added:
            self.cmd("notification", ["done", "Added <b>%s</b> new site" % added, 5000])
        RateLimit.called(self.site.address + "-MergerSiteAdd")
        site_manager.updateMergerSites()

    # Delete a merged site
    def actionMergerSiteDelete(self, to, address):
        site = self.server.sites.get(address)
        if not site:
            return self.response(to, {"error": "No site found: %s" % address})

        merger_types = merger_db.get(self.site.address)
        if not merger_types:
            return self.response(to, {"error": "Not a merger site"})
        if merged_db.get(address) not in merger_types:
            return self.response(to, {"error": "Merged type (%s) not in %s" % (merged_db.get(address), merger_types)})

        self.cmd("notification", ["done", "Site deleted: <b>%s</b>" % address, 5000])
        self.response(to, "ok")

    # Lists merged sites
    def actionMergerSiteList(self, to, query_site_info=False):
        merger_types = merger_db.get(self.site.address)
        ret = {}
        if not merger_types:
            return self.response(to, {"error": "Not a merger site"})
        for address, merged_type in merged_db.iteritems():
            if merged_type not in merger_types:
                continue  # Site not for us
            if query_site_info:
                site = self.server.sites.get(address)
                ret[address] = self.formatSiteInfo(site, create_user=False)
            else:
                ret[address] = merged_type
        self.response(to, ret)

    # Add support merger sites for file commands
    def mergerFuncWrapper(self, func_name, to, inner_path, *args, **kwargs):
        func = getattr(super(UiWebsocketPlugin, self), func_name)
        if inner_path.startswith("merged-"):
            merged_address, merged_inner_path = checkMergerPath(self.site.address, inner_path)

            # Set the same cert for merged site
            merger_cert = self.user.getSiteData(self.site.address).get("cert")
            if merger_cert:
                self.user.setCert(merged_address, merger_cert)

            site_before = self.site  # Save to be able to change it back after we ran the command
            self.site = self.server.sites.get(merged_address)  # Change the site to the merged one
            try:
                back = func(to, merged_inner_path, *args, **kwargs)
            finally:
                self.site = site_before  # Change back to original site
            return back
        else:
            return func(to, inner_path, *args, **kwargs)

    def actionFileGet(self, to, inner_path, *args, **kwargs):
        return self.mergerFuncWrapper("actionFileGet", to, inner_path, *args, **kwargs)

    def actionFileWrite(self, to, inner_path, *args, **kwargs):
        return self.mergerFuncWrapper("actionFileWrite", to, inner_path, *args, **kwargs)

    def actionFileDelete(self, to, inner_path, *args, **kwargs):
        return self.mergerFuncWrapper("actionFileDelete", to, inner_path, *args, **kwargs)

    def actionFileRules(self, to, inner_path, *args, **kwargs):
        return self.mergerFuncWrapper("actionFileRules", to, inner_path, *args, **kwargs)

    # Add support merger sites for file commands with privatekey parameter
    def mergerFuncWrapperWithPrivatekey(self, func_name, to, privatekey, inner_path, *args, **kwargs):
        func = getattr(super(UiWebsocketPlugin, self), func_name)
        if inner_path.startswith("merged-"):
            merged_address, merged_inner_path = checkMergerPath(self.site.address, inner_path)
            merged_site = self.server.sites.get(merged_address)

            # Set the same cert for merged site
            merger_cert = self.user.getSiteData(self.site.address).get("cert")
            if merger_cert:
                self.user.setCert(merged_address, merger_cert)

            site_before = self.site  # Save to be able to change it back after we ran the command
            self.site = merged_site  # Change the site to the merged one
            try:
                back = func(to, privatekey, merged_inner_path, *args, **kwargs)
            finally:
                self.site = site_before  # Change back to original site
            return back
        else:
            return func(to, privatekey, inner_path, *args, **kwargs)

    def actionSiteSign(self, to, privatekey=None, inner_path="content.json", *args, **kwargs):
        return self.mergerFuncWrapperWithPrivatekey("actionSiteSign", to, privatekey, inner_path, *args, **kwargs)

    def actionSitePublish(self, to, privatekey=None, inner_path="content.json", *args, **kwargs):
        return self.mergerFuncWrapperWithPrivatekey("actionSitePublish", to, privatekey, inner_path, *args, **kwargs)

    def actionPermissionAdd(self, to, permission):
        super(UiWebsocketPlugin, self).actionPermissionAdd(to, permission)
        self.site.storage.rebuildDb()


@PluginManager.registerTo("UiRequest")
class UiRequestPlugin(object):
    # Allow to load merged site files using /merged-ZeroMe/address/file.jpg
    def parsePath(self, path):
        path_parts = super(UiRequestPlugin, self).parsePath(path)
        if "merged-" not in path:  # Optimization
            return path_parts
        path_parts["address"], path_parts["inner_path"] = checkMergerPath(path_parts["address"], path_parts["inner_path"])
        return path_parts


@PluginManager.registerTo("SiteStorage")
class SiteStoragePlugin(object):
    # Also rebuild from merged sites
    def getDbFiles(self):
        merger_types = merger_db.get(self.site.address)

        # First return the site's own db files
        for item in super(SiteStoragePlugin, self).getDbFiles():
            yield item

        # Not a merger site, that's all
        if not merger_types:
            raise StopIteration

        merged_sites = [
            site_manager.sites[address]
            for address, merged_type in merged_db.iteritems()
            if merged_type in merger_types
        ]
        for merged_site in merged_sites:
            merged_type = merged_db[merged_site.address]
            for content_inner_path, content in merged_site.content_manager.contents.iteritems():
                # content.json file itself
                if merged_site.storage.isFile(content_inner_path):  # Missing content.json file
                    content_path = self.getPath("merged-%s/%s/%s" % (merged_type, merged_site.address, content_inner_path))
                    yield content_path, merged_site.storage.open(content_inner_path)
                else:
                    merged_site.log.error("[MISSING] %s" % content_inner_path)
                # Data files in content.json
                content_inner_path_dir = helper.getDirname(content_inner_path)  # Content.json dir relative to site
                for file_relative_path in content["files"].keys():
                    if not file_relative_path.endswith(".json"):
                        continue  # We only interesed in json files
                    file_inner_path = content_inner_path_dir + file_relative_path  # File Relative to site dir
                    file_inner_path = file_inner_path.strip("/")  # Strip leading /
                    if merged_site.storage.isFile(file_inner_path):
                        file_path = self.getPath("merged-%s/%s/%s" % (merged_type, merged_site.address, file_inner_path))
                        yield file_path, merged_site.storage.open(file_inner_path)
                    else:
                        merged_site.log.error("[MISSING] %s" % file_inner_path)

    # Also notice merger sites on a merged site file change
    def onUpdated(self, inner_path, file=None):
        super(SiteStoragePlugin, self).onUpdated(inner_path, file)

        merged_type = merged_db.get(self.site.address)

        for merger_site in merged_to_merger.get(self.site.address, []):
            if merger_site.address == self.site.address:  # Avoid infinite loop
                continue
            virtual_path = "merged-%s/%s/%s" % (merged_type, self.site.address, inner_path)
            if inner_path.endswith(".json"):
                if file is not None:
                    merger_site.storage.onUpdated(virtual_path, file=file)
                else:
                    merger_site.storage.onUpdated(virtual_path, file=self.open(inner_path))
            else:
                merger_site.storage.onUpdated(virtual_path)


@PluginManager.registerTo("Site")
class SitePlugin(object):
    def fileDone(self, inner_path):
        super(SitePlugin, self).fileDone(inner_path)

        merged_type = merged_db.get(self.address)
        virtual_path = "merged-%s/%s/%s" % (merged_type, self.address, inner_path)

        for merger_site in merged_to_merger.get(self.address, []):
            if merger_site.address == self.address:
                continue
            merger_site.fileDone(virtual_path)

    def fileFailed(self, inner_path):
        super(SitePlugin, self).fileFailed(inner_path)

        merged_type = merged_db.get(self.address)
        virtual_path = "merged-%s/%s/%s" % (merged_type, self.address, inner_path)

        for merger_site in merged_to_merger.get(self.address, []):
            if merger_site.address == self.address:
                continue
            merger_site.fileFailed(virtual_path)


@PluginManager.registerTo("SiteManager")
class SiteManagerPlugin(object):
    # Update merger site for site types
    def updateMergerSites(self):
        global merger_db, merged_db, merged_to_merger, site_manager
        s = time.time()
        merger_db = {}
        merged_db = {}
        merged_to_merger = {}
        site_manager = self
        for site in self.sites.itervalues():
            # Update merged sites
            merged_type = site.content_manager.contents.get("content.json", {}).get("merged_type")
            if merged_type:
                merged_db[site.address] = merged_type

            # Update merger sites
            for permission in site.settings["permissions"]:
                if not permission.startswith("Merger:"):
                    continue
                if merged_type:
                    self.log.error("Removing permission %s from %s: Merger and merged at the same time." % (permission, site.address))
                    site.settings["permissions"].remove(permission)
                    continue
                merger_type = permission.replace("Merger:", "")
                if site.address not in merger_db:
                    merger_db[site.address] = []
                merger_db[site.address].append(merger_type)
                site_manager.sites[site.address] = site

            # Update merged to merger
            if merged_type:
                for merger_site in self.sites.itervalues():
                    if "Merger:" + merged_type in merger_site.settings["permissions"]:
                        if site.address not in merged_to_merger:
                            merged_to_merger[site.address] = []
                        merged_to_merger[site.address].append(merger_site)
        self.log.debug("Updated merger sites in %.3fs" % (time.time() - s))

    def load(self, *args, **kwags):
        super(SiteManagerPlugin, self).load(*args, **kwags)
        self.updateMergerSites()

    def save(self, *args, **kwags):
        super(SiteManagerPlugin, self).save(*args, **kwags)
        self.updateMergerSites()