#!/usr/bin/env bash
# implementation of .travis.yml execution using pure bash
# limited functionality

# shellcheck disable=SC1003

# yaml.sh # pulled from
# https://raw.githubusercontent.com/jasperes/bash-yaml/master/script/yaml.sh
# Licensed under MIT license

# Based on https://gist.github.com/pkuczynski/8665367

failure=0

parse_yaml() {
    local yaml_file=$1
    local prefix=$2
    local s
    local w
    local fs

    s='[[:space:]]*'
    w='[a-zA-Z0-9_.-]*'
    fs="$(echo @|tr @ '\034')"

    (
        sed -e '/- [^\“]'"[^\']"'.*: /s|\([ ]*\)- \([[:space:]]*\)|\1-\'$'\n''  \1\2|g' |

        sed -ne '/^--/s|--||g; s|\"|\\\"|g; s/[[:space:]]*$//g;' \
            -e "/#.*[\"\']/!s| #.*||g; /^#/s|#.*||g;" \
            -e "s|^\($s\)\($w\)$s:$s\"\(.*\)\"$s\$|\1$fs\2$fs\3|p" \
            -e "s|^\($s\)\($w\)${s}[:-]$s\(.*\)$s\$|\1$fs\2$fs\3|p" |

        awk -F"$fs" '{
            indent = length($1)/2;
            if (length($2) == 0) { conj[indent]="+";} else {conj[indent]="";}
            vname[indent] = $2;
            for (i in vname) {if (i > indent) {delete vname[i]}}
                if (length($3) > 0) {
                    vn=""; for (i=0; i<indent; i++) {vn=(vn)(vname[i])("_")}
                    printf("%s%s%s%s=(\"%s\")\n", "'"$prefix"'",vn, $2, conj[indent-1],$3);
                }
            }' |

        sed -e 's/_=/+=/g' |

        awk 'BEGIN {
                FS="=";
                OFS="="
            }
            /(-|\.).*=/ {
                gsub("-|\\.", "_", $1)
            }
            { print }'
    ) < "$yaml_file"
}

create_variables() {
    local yaml_file="$1"
    local prefix="$2"
    eval "$(parse_yaml "$yaml_file" "$prefix")"
}

if [ ! -e .travis.yml ]; then
    echo "No .travis.yml found, exiting"
    exit 1
fi

function aptinstall() {
    # apt install
    # shellcheck disable=SC2154
    if [[ "$(declare -p travis_addons_apt_packages)" =~ "declare -a" ]]; then
        echo -e "\nsudo apt -y update\n"
        sudo apt -y update
        # shellcheck disable=SC2086
        echo -e "\nsudo apt-get -yq --no-install-suggests --no-install-recommends install ${travis_addons_apt_packages[*]}\n"
        sudo apt-get -yq --no-install-suggests --no-install-recommends install \
            ${travis_addons_apt_packages[*]}
    fi
}

function virtualenv_init() {
    # init virtualenv directory
    if [ -n "$1" ]; then
        echo -e "\nvirtualenv -p \"$1\" ~/.venv\n"
        virtualenv -p "$1" ~/.venv
    else
        echo -e "\nvirtualenv ~/.venv\n"
        virtualenv ~/.venv
    fi
}

function virtualenv_activate() {
    # activate virtualenv
    # shellcheck disable=SC1090
    echo -e "\n. ~/.venv/bin/activate\n"
    . ~/.venv/bin/activate
}

function python_run() {
    # shellcheck disable=SC2154
    if [[ "$(declare -p travis_install)" =~ "declare -a" ]]; then
        echo "Running \"install\""
        for ((i = 0; i < ${#travis_install[@]}; i++))
        do
            echo -e "\n${travis_install[$i]}\n"
            if ! ${travis_install[$i]}; then
                failure=1
            fi
        done
    fi
    # shellcheck disable=SC2154
    if [[ "$(declare -p travis_script)" =~ "declare -a" ]]; then
        echo "Running \"script\""
        for ((i = 0; i < ${#travis_script[@]}; i++))
        do
            echo -e "\n${travis_script[$i]}\n"
            if ! ${travis_script[$i]}; then
                failure=1
            fi
        done
    fi
}

create_variables .travis.yml travis_

aptinstall

# shellcheck disable=SC2154
if [[ "$(declare -p travis_python)" =~ "declare -a" ]]; then
    # shellcheck disable=SC2068
    for pv in ${travis_python[@]}; do
        # strip quotes
        temp="${pv%\"}"
        pv="${temp#\"}"
        ppath=/usr/bin/python$pv
        virtualenv_init "$ppath"
        virtualenv_activate
        python_run "$ppath"
        deactivate
    done
else
    virtualenv_init
    virtualenv_activate
    python_run 
    deactivate
fi

exit $failure