#!/bin/bash -e
#
# build-docs
#
#   Builds master & develop, exporting from subversion repos.
#
# build-docs download
#
#  Downloads tarballs.
#
# build-docs build branches...
#
#   Builds the given branches.
#   Exports from git.
#
# build-docs upload
#
#   Upload any outstanding upload to sandbox and cowic
#
# Your ~/.ssh should contain public and private ssh keys for
# uploading to sourceforge sandbox. Your .netrc should contain
# the login details for cowic.
#
# You probably want to deactivate any hard drive indexing service for
# this directory. For OS X, go to the spotlight preference pane, and
# look under the 'privacy' tab.

###############################################################################
#
# Initial setup
#
# Try to follow this (I'm sure I don't at some point):
# http://www.davidpashley.com/articles/writing-robust-shell-scripts.html

# Exit on error
set -e
# Treat unset parameters as an error
set -u

cd $(dirname $0)
root=$(pwd)
. $root/settings.sh

# This script uses background tasks in a few places, so try to kill them if
# things go wrong. Doesn't seem to always work properly though. Might not
# be worth using background tasks.
#
# http://stackoverflow.com/questions/360201/kill-background-process-when-shell-script-exit
trap 'if [ "$(jobs -p)x" != x ]; then kill $(jobs -p); fi' INT TERM EXIT


###############################################################################
#
# Main

main()
{
    if [ $# = 0 ]; then
        $root/upload-documentation
        build master develop
    else
        case $1 in
        "download")     $root/download true ;;
        "build")        shift ; $root/upload-documentation ; build $* ;;
        "master")       $root/upload-documentation ; build $* ;;
        "develop")      $root/upload-documentation ; build $* ;;
        "upload")       $root/upload-documentation ;;
        *)              echo "Unknown command: $1"; exit 1;;
        esac
    fi
}

###############################################################################
#
# Check that executables are available and set some environment variables.

setup_executables() {
    # Could I do this without a global?
    export CHECK_FAILED=0

    check_executable git
    check_executable 7za
    check_executable xsltproc
    check_executable latex
    check_executable dvips
    check_executable dot
    check_executable pax
    check_executable make
    check_executable wget
    check_executable $DOXYGEN_BIN
    check_executable $CXX_BIN
    check_file $DOC_DATA/tarballs/rapidxml-1.13.zip

    if [ x$CCACHE_BIN != x ]
    then
        check_executable $CCACHE_BIN
    fi

    if [ $CHECK_FAILED = 1 ]
    then
        exit 1
    fi
}

check_executable() {
    name=$1

    if type -P $name > /dev/null
    then
        echo "Found $name"
    else
        echo "Error: couldn't find $name"
        export CHECK_FAILED=1
    fi
}

check_file() {
    name=$1

    if [ -f $name ]
    then
        echo "Found $name"
    else
        echo "Error: couldn't find $name"
        export CHECK_FAILED=1
    fi

}

###############################################################################
#
# Build
#
# Builds the given branches as child processes so that output can be piped
# and errors don't end the whole script.

build()
{
    echo
    echo "Setup output directory."
    echo

    setup_output_dir

    echo
    echo Download dependencies
    echo

    $root/download | tee $output/download.log

    echo
    echo Check that executables are available.
    echo

    setup_executables

    for branch in $*
    do
        echo "Build branch $branch " >> $output/summary.txt
        echo >> $output/summary.txt

        echo
        echo "Build branch $branch."
        echo

        $root/build-impl $branch $output 2>&1 | tee $output/build-$branch.log

        echo >> $output/summary.txt
    done

    echo
    echo "Upload."
    echo

    # Upload to sandbox and cowic
    $root/upload-documentation | tee $output/upload.log

    echo
    echo "Summary."
    echo

    cat $output/summary.txt
}

###############################################################################
#
# Setup Output Directory

setup_output_dir()
{
    export output=$DOC_DATA/history/$(date -u '+%Y%m%d-%H%M')

    if test -d $output; then
        rmdir $output
    fi

    mkdir -p $output
    touch $output/summary.txt
}


###############################################################################
#
# Launch Main

main $*