#!/bin/bash

# This script copies generated .pb.html files, which contain reference docs for protos, and installs
# them in their targeted location within the content/docs/reference tree of this repo. Each .pb.html file contains a
# line that indicates the target directory location. The line is of the form:
#
#  location: https://istio.io/docs/reference/...
#
# Additionally, this script also builds Istio components and runs them to extract their command-line docs which it
# copies to content/docs/reference/commands.

#set -e

ISTIO_BASE=$(cd "$(dirname "$0")" ; pwd -P)/..
WORK_DIR=$(mktemp -d)
COMMAND_DIR=$ISTIO_BASE/content/docs/reference/commands

# Get the source code
pushd $WORK_DIR
git clone https://github.com/istio/api.git
git clone https://github.com/istio/istio.git
rm -fr istio/vendor
popd

# Given the name of a .pb.html file, extracts the $location marker and then proceeds to
# copy the file to that location in the _docs hierarchy.
locate_file() {
    FILENAME=$1

    LOCATION=$(grep '^location: https://istio.io/docs' $FILENAME)
    LEN=${#LOCATION}
    if [ $LEN -eq 0 ]
    then
        echo "No 'location:' tag in $FILENAME, skipping"
        return
    fi
    FNP=${LOCATION:31}
    FN=$(echo $FNP | rev | cut -d'/' -f1 | rev)
    PP=$(echo $FNP | rev | cut -d'/' -f2- | rev)
    sed -e 's/href="https:\/\/istio.io/href="/g' ${FILENAME} >content/docs${PP}/${FN}
}

# Given the path and name to an Istio command, builds the command and then
# runs it to extract its command-line docs
#
# TODO: Even though this CDs into the source tree we've extracted, it's not actually
# using that as input sources since imports are resolved through $GOPATH and such.
# I'm not clear what voodoo is needed so I'm leaving this as-is for the time being
get_command_doc() {
    COMMAND_PATH=$1
    COMMAND=$2

    pushd $COMMAND_PATH
    go build
    ./$COMMAND collateral -o $COMMAND_DIR --jekyll_html
    rm $COMMAND
    popd
}

# First delete all the current generated files so that any stale files are removed
find content/docs/reference -name '*.html' -type f|xargs rm

for f in `find $WORK_DIR/istio -type f -name '*.pb.html'`
do
    echo "processing $f"
    locate_file $f
done

for f in `find $WORK_DIR/api -type f -name '*.pb.html'`
do
    echo "processing $f"
    locate_file $f
done

# get_command_doc $WORK_DIR/istio/broker/cmd/brks brks
get_command_doc $WORK_DIR/istio/mixer/cmd/mixc mixc
get_command_doc $WORK_DIR/istio/mixer/cmd/mixs mixs
get_command_doc $WORK_DIR/istio/istioctl/cmd/istioctl istioctl
get_command_doc $WORK_DIR/istio/pilot/cmd/pilot-agent pilot-agent
get_command_doc $WORK_DIR/istio/pilot/cmd/pilot-discovery pilot-discovery
get_command_doc $WORK_DIR/istio/pilot/cmd/sidecar-injector sidecar-injector
get_command_doc $WORK_DIR/istio/security/cmd/istio_ca istio_ca
get_command_doc $WORK_DIR/istio/security/cmd/node_agent node_agent

rm -fr $WORK_DIR