#!/usr/bin/env bash

# bump_version - increase the shared version and generate changelogs

set -o errexit
set -o pipefail

usage() {
    echo -e "bump_version - increase the shared version and generate changelogs"
    echo -e ""
    echo -e "Usage:"
    echo -e " $ bump_version [-b/--web-branch <web_branch>] <new_version>"
    echo -e ""
    echo -e "The web_branch defaults to the same branch name as the current main branch."
    echo -e "This helps facilitate releases where both branches would be called release-X.Y.Z"
    echo -e "and would already be created before running this script."
}

if [[ -z $1 ]]; then
    usage
    exit 1
fi

shared_version_file="./SharedVersion.cs"

# Parse branch option
if [[ $1 == '-b' || $1 == '--web-branch' ]]; then
	web_branch="$2"
	shift 2
else
    web_branch="$( git branch 2>/dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/' )"
fi

# Initialize submodules
git submodule update --init --recursive

# configure branch
pushd MediaBrowser.WebDashboard/jellyfin-web

if ! git diff-index --quiet HEAD --; then
    popd
    echo
    echo "ERROR: Your 'jellyfin-web' submodule working directory is not clean!"
    echo "This script will overwrite your unstaged and unpushed changes."
    echo "Please do development on 'jellyfin-web' outside of the submodule."
    exit 1
fi

git fetch --all
# If this is an official branch name, fetch it from origin
official_branches_regex="^master$|^dev$|^release-.*$|^hotfix-.*$"
if [[ ${web_branch} =~ ${official_branches_regex} ]]; then
    git checkout origin/${web_branch} || {
        echo "ERROR: 'jellyfin-web' branch 'origin/${web_branch}' is invalid."
        exit 1
    }
# Otherwise, just check out the local branch (for testing, etc.)
else
    git checkout ${web_branch} || {
        echo "ERROR: 'jellyfin-web' branch '${web_branch}' is invalid."
        exit 1
    }
fi
popd

new_version="$1"

# Parse the version from the AssemblyVersion
old_version="$(
    grep "AssemblyVersion" ${shared_version_file} \
        | sed -E 's/\[assembly: ?AssemblyVersion\("([0-9\.]+)"\)\]/\1/' \
        | sed -E 's/.0$//'
)"

# Set the shared version to the specified new_version
old_version_sed="$( sed 's/\./\\./g' <<<"${old_version}" )" # Escape the '.' chars
sed -i "s/${old_version_sed}/${new_version}/g" ${shared_version_file}

declare -a pr_merges_since_last_master
declare changelog_string_github
declare changelog_string_deb
declare changelog_string_yum

# Build up a changelog from merge commits
for repo in ./ MediaBrowser.WebDashboard/jellyfin-web/; do
    last_master_merge_commit=""
    pr_merges_since_last_master=()
    git_show_details=""
    pull_request_id=""
    pull_request_description=""
    changelog_strings_repo_github=""
    changelog_strings_repo_deb=""
    changelog_strings_repo_yum=""

    case $repo in
        *jellyfin-web*)
            repo_name="jellyfin-web"
        ;;
        *)
            repo_name="jellyfin"
        ;;
    esac

    pushd ${repo}

    # Find the last release commit, so we know what's happened since
    last_master_branch="release-${old_version}"
    last_master_merge_commit="$(
        git log --merges --pretty=oneline \
            | grep -F "${last_master_branch}" \
            | awk '{ print $1 }' \
            || true # Don't die here with errexit
    )"
    if [[ -z ${last_master_merge_commit} ]]; then
        # This repo has no last proper commit, so just skip it
        popd
        continue
    fi
    # Get all the PR merge commits since the last master merge commit in `jellyfin`
    pr_merges_since_last_master+=( $(
        git log --merges --pretty=oneline ${last_master_merge_commit}..HEAD \
            | grep -F "Merge pull request" \
            | awk '{ print $1 }'
    ) )

    for commit_hash in ${pr_merges_since_last_master[@]}; do
        git_show_details="$( git show ${commit_hash} )"
        pull_request_id="$(
            awk '
                /Merge pull request/{ print $4 }
                { next }
            ' <<<"${git_show_details}"
        )"
        pull_request_description="$(
            awk '
                /^[a-zA-Z]/{ next }
                /^    Merge/{ next }
                /^$/{ next }
                { print $0 }
            ' <<<"${git_show_details}"
        )"
        pull_request_description="$( sed ':a;N;$!ba;s/\n//g; s/  \+//g' <<<"${pull_request_description}" )"
        changelog_strings_repo_github="${changelog_strings_repo_github}\n* ${pull_request_id}: ${pull_request_description}"
        changelog_strings_repo_deb="${changelog_strings_repo_deb}\n  * $( sed 's/#/PR/' <<<"${pull_request_id}" ) ${pull_request_description}"
        changelog_strings_repo_yum="${changelog_strings_repo_yum}\n- $( sed 's/#/PR/' <<<"${pull_request_id}" ) ${pull_request_description}"
    done

    changelog_string_github="${changelog_string_github}\n#### ${repo_name}:\n$( echo -e "${changelog_strings_repo_github}" | sort -nk2 )\n"
    changelog_string_deb="${changelog_string_deb}\n  * ${repo_name}:$( echo -e "${changelog_strings_repo_deb}" | sort -nk2 )"
    changelog_string_yum="${changelog_string_yum}\n- ${repo_name}:$( echo -e "${changelog_strings_repo_yum}" | sort -nk2 )"

    popd
done

# Write out a temporary Debian changelog with our new stuff appended and some templated formatting
debian_changelog_file="deployment/debian-package-x64/pkg-src/changelog"
debian_changelog_temp="$( mktemp )"
# Create new temp file with our changelog
echo -e "### DEBIAN PACKAGE CHANGELOG: Verify this file looks correct or edit accordingly, then delete this line, write, and exit.
jellyfin (${new_version}-1) unstable; urgency=medium
${changelog_string_deb}

 -- Jellyfin Packaging Team <packaging@jellyfin.org>  $( date --rfc-2822 )
" >> ${debian_changelog_temp}
cat ${debian_changelog_file} >> ${debian_changelog_temp}
# Edit the file to verify
$EDITOR ${debian_changelog_temp}
# Move into place
mv ${debian_changelog_temp} ${debian_changelog_file}
# Clean up
rm -f ${debian_changelog_temp}

# Write out a temporary Yum changelog with our new stuff prepended and some templated formatting
fedora_spec_file="deployment/fedora-package-x64/pkg-src/jellyfin.spec"
fedora_changelog_temp="$( mktemp )"
fedora_spec_temp_dir="$( mktemp -d )"
fedora_spec_temp="${fedora_spec_temp_dir}/jellyfin.spec.tmp"
# Make a copy of our spec file for hacking
cp ${fedora_spec_file} ${fedora_spec_temp_dir}/
pushd ${fedora_spec_temp_dir}
# Split out the stuff before and after changelog
csplit jellyfin.spec  "/^%changelog/" # produces xx00 xx01
# Update the version in xx00
sed -i "s/${old_version_sed}/${new_version}/g" xx00
# Remove the header from xx01
sed -i '/^%changelog/d' xx01
# Create new temp file with our changelog
echo -e "### YUM SPEC CHANGELOG: Verify this file looks correct or edit accordingly, then delete this line, write, and exit.
%changelog
* $( LANG=C date '+%a %b %d %Y' ) Jellyfin Packaging Team <packaging@jellyfin.org>${changelog_string_yum}" >> ${fedora_changelog_temp}
cat xx01 >> ${fedora_changelog_temp}
# Edit the file to verify
$EDITOR ${fedora_changelog_temp}
# Reassembble
cat xx00 ${fedora_changelog_temp} > ${fedora_spec_temp}
popd
# Move into place
mv ${fedora_spec_temp} ${fedora_spec_file}
# Clean up
rm -rf ${fedora_changelog_temp} ${fedora_spec_temp_dir}

# Stage the changed files for commit
git add ${shared_version_file} ${debian_changelog_file} ${fedora_spec_file}
git status

# Write out the GitHub-formatted changelog for the merge request/release pages
echo ""
echo "=== The GitHub-formatted changelog follows ==="
echo -e "${changelog_string_github}"