#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail

create_changelog() {
    local chart="$1"
    local chartname="$2"
    local train="$3"
    local chartversion="$4"
    local prevversion="$(git tag -l "${chartname}-*" --sort=-v:refname  | head -n 1)"
    echo "Generating changelogs for: ${chartname}"
    # SCALE "Changelog" containing only last change
    git-chglog --next-tag ${chartname}-${chartversion} --tag-filter-pattern ${chartname} --path ${chart} -o ${chart}/app-changelog.md ${chartname}-${chartversion}
    # Append SCALE changelog to actual changelog

    if [[ -f "${chart}/CHANGELOG.md" ]]; then
       true
    else
       touch ${chart}/CHANGELOG.md
    fi
    sed -i '1d' ${chart}/CHANGELOG.md
    cat ${chart}/app-changelog.md | cat - ${chart}/CHANGELOG.md > temp && mv temp ${chart}/CHANGELOG.md
    sed -i '1s/^/# Changelog\n\n/' ${chart}/CHANGELOG.md
    rm ${chart}/app-changelog.md || echo "changelog not found..."
    }
    export -f create_changelog


if [[ -d "charts/${1}" ]]; then
    echo "Start processing charts/${1} ..."
    chartversion=$(cat charts/${1}/Chart.yaml | grep "^version: " | awk -F" " '{ print $2 }')
    chartname=$(basename charts/${1})
    train=$(basename $(dirname "charts/${1}"))
    SCALESUPPORT=$(cat charts/${1}/Chart.yaml | yq '.annotations."truecharts.org/SCALE-support"' -r)
    create_changelog "charts/${1}" "${chartname}" "$train" "${chartversion}" || echo "changelog generation failed..."
else
    echo "Chart 'charts/${1}' no longer exists in repo. Skipping it..."
fi
echo "Done processing charts/${1} ..."