#!/usr/bin/env bash
# prepare-commit-msg — auto-appends Forgejo ticket link when branch name contains a ticket number
#
# Branch name patterns detected:
#   feat/42-description   fix/42-desc   42-description   issue-42-desc
#
# Appends to commit body:
#   Closes: https://git.opensourcesolarpunk.com/Circuit-Forge/<repo>/issues/<N>

set -euo pipefail

MSG_FILE="$1"
SOURCE="${2:-}"

# Don't modify merge commits, squash commits, or amends that already have a body
[[ "$SOURCE" == "merge" || "$SOURCE" == "squash" ]] && exit 0

# Get the current branch name
BRANCH=$(git symbolic-ref --short HEAD 2>/dev/null || echo "")
[[ -z "$BRANCH" ]] && exit 0

# Extract ticket number — match digits after type-prefix slash or at start, before a dash/underscore
TICKET=$(echo "$BRANCH" | grep -oE '(^|/)(issue-)?([0-9]+)[-_]' | grep -oE '[0-9]+' | head -1 || true)
[[ -z "$TICKET" ]] && exit 0

# Derive repo name from origin remote
REMOTE_URL=$(git remote get-url origin 2>/dev/null || echo "")
REPO=$(echo "$REMOTE_URL" | sed -E 's|.*Circuit-Forge/||;s|\.git$||')
[[ -z "$REPO" ]] && exit 0

TICKET_URL="https://git.opensourcesolarpunk.com/Circuit-Forge/${REPO}/issues/${TICKET}"

# Skip if the URL (or a bare #N ref) is already in the message
if grep -qF "$TICKET_URL" "$MSG_FILE" || grep -qE "^(Closes|Fixes|Refs|See):.*#${TICKET}" "$MSG_FILE"; then
    exit 0
fi

# Append to message body (separated by blank line from subject)
printf "\nCloses: %s\n" "$TICKET_URL" >> "$MSG_FILE"