#!/bin/sh
set -e

# version
msg="${CI_COMMIT_MESSAGE:-}"
# optional PR body (written by workflow from Gitea API when this commit is a merged PR)
if [ -f .ci_pr_body ]; then
  CI_PR_DESCRIPTION=$(cat .ci_pr_body); rm -f .ci_pr_body
else
  CI_PR_DESCRIPTION=""
fi
export CI_PR_DESCRIPTION
bump=patch
# Conventional commits: chore/fix => patch, feat => minor
echo "$msg" | grep -Eqi '(^|[[:space:]])(fix|chore)(\([^)]*\))?:' && bump=patch
echo "$msg" | grep -Eqi '(^|[[:space:]])feat(\([^)]*\))?:' && bump=minor
# Conventional commits breaking change: type!:
echo "$msg" | grep -Eqi '(^|[[:space:]])[a-zA-Z]+(\([^)]*\))?!:' && bump=major
# Explicit bump prefixes still supported (but never downgrade a major bump)
echo "$msg" | grep -qi minor: && [ "$bump" != "major" ] && bump=minor
echo "$msg" | grep -qi major: && bump=major
cur=$(awk '/"version"/ { match($0, /[0-9]+\.[0-9]+\.[0-9]+/); print substr($0, RSTART, RLENGTH); exit }' package.json)
case "$cur" in
  [0-9]*.[0-9]*.[0-9]*) ;;
  *) echo "error: package.json version must be x.y.z (got: $cur)"; exit 1 ;;
esac
major=$(echo "$cur" | cut -d. -f1); minor=$(echo "$cur" | cut -d. -f2); patch=$(echo "$cur" | cut -d. -f3)
case "$bump" in major) major=$((major+1)); minor=0; patch=0 ;; minor) minor=$((minor+1)); patch=0 ;; patch) patch=$((patch+1)) ;; esac
newVersion="$major.$minor.$patch"

url="https://${CI_REPO_OWNER}:${GITEA_REPO_TOKEN}@${CI_FORGE_URL#https://}/${CI_REPO_OWNER}/${CI_REPO_NAME}.git"
if [ -n "$(git ls-remote "$url" "refs/tags/v$newVersion" 2>/dev/null)" ]; then
  exit 0
fi

# changelog entry (strip explicit bump prefixes & any conventional-commit type(scope):); optional PR description enriches it
changelogEntry=$(
  echo "$msg" \
    | head -1 \
    | sed -E 's/^[[:space:]]*[mM]ajor:[[:space:]]*//; s/^[[:space:]]*[mM]inor:[[:space:]]*//; s/^[[:space:]]*[pP]atch:[[:space:]]*//' \
    | sed -E 's/^[[:space:]]*[a-zA-Z]+(\([^)]*\))?:[[:space:]]*//'
)
[ -z "$changelogEntry" ] && changelogEntry="Release v$newVersion"
if [ -n "$CI_PR_DESCRIPTION" ]; then
  changelogFull="- $changelogEntry

$CI_PR_DESCRIPTION"
else
  changelogFull="- $changelogEntry"
fi

# bump files
awk -v v="$newVersion" '/"version"/ { sub(/[0-9]+\.[0-9]+\.[0-9]+/, v) } { print }' package.json > package.json.tmp && mv package.json.tmp package.json
awk -v v="$newVersion" '/^version:/ { $0 = "version: " v }; /^appVersion:/ { $0 = "appVersion: \"" v "\"" }; { print }' helm/kestrelos/Chart.yaml > helm/kestrelos/Chart.yaml.tmp && mv helm/kestrelos/Chart.yaml.tmp helm/kestrelos/Chart.yaml
awk -v v="$newVersion" '/^  tag:/ { $0 = "  tag: " v }; { print }' helm/kestrelos/values.yaml > helm/kestrelos/values.yaml.tmp && mv helm/kestrelos/values.yaml.tmp helm/kestrelos/values.yaml

# changelog
new="## [$newVersion] - $(date +%Y-%m-%d)
### Changed
$changelogFull

"
# Create CHANGELOG.md if missing (first release); otherwise prepend new entry to existing content.
{ [ ! -f CHANGELOG.md ] && printf '# Changelog\n\n'; printf '%s' "$new"; [ -f CHANGELOG.md ] && cat CHANGELOG.md || true; } > CHANGELOG.md.tmp && mv CHANGELOG.md.tmp CHANGELOG.md

# git
git config user.email "ci@kestrelos" && git config user.name "CI"
git add package.json helm/kestrelos/Chart.yaml helm/kestrelos/values.yaml CHANGELOG.md
git commit -m "release v$newVersion [skip ci]"
git tag "v$newVersion"
# artifact for docker (tag list)
printf '%s\n%s\n' "$newVersion" "latest" > .tags
retry() { n=0; while ! "$@"; do n=$((n+1)); [ $n -ge 3 ] && return 1; sleep 2; done; }
retry git push "$url" HEAD:main "v$newVersion"

# gitea release
body="## Changelog
### Changed
$changelogFull

## Installation
- [Docker image](${CI_FORGE_URL}/${CI_REPO_OWNER}/-/packages/container/${CI_REPO_NAME})
- [Helm chart](${CI_FORGE_URL}/${CI_REPO_OWNER}/-/packages/helm/${CI_REPO_NAME})"
release_url="${CI_FORGE_URL}/api/v1/repos/${CI_REPO_OWNER}/${CI_REPO_NAME}/releases"
echo "$body" | awk -v tag="v$newVersion" 'BEGIN{printf "{\"tag_name\":\"" tag "\",\"name\":\"" tag "\",\"body\":\""} { gsub(/\\/,"\\\\"); gsub(/"/,"\\\""); if (NR>1) printf "\\n"; printf "%s", $0 } END{printf "\"}\n"}' > /tmp/release.json
wget -q -O /dev/null --post-file=/tmp/release.json \
  --header="Authorization: token ${GITEA_REPO_TOKEN}" \
  --header="Content-Type: application/json" \
  "$release_url"