#!/usr/bin/env bash
# Shared, process-safe lock for Gradle and IntelliJ platform test runs.
# This file is sourced by jaigradle and jaitest; it is not a standalone command.

JAI_GRADLE_LOCK_DIR="${JAI_GRADLE_LOCK_DIR:-.gradle-test.lock}"
JAI_GRADLE_LOCK_PID_FILE="$JAI_GRADLE_LOCK_DIR/pid"

jai_gradle_lock_acquire() {
	if [[ "${JAI_GRADLE_LOCK_HELD:-0}" == "1" ]]; then
		return 0
	fi

	local reported=0
	while ! mkdir "$JAI_GRADLE_LOCK_DIR" 2>/dev/null; do
		if [[ -f "$JAI_GRADLE_LOCK_PID_FILE" ]]; then
			local owner
			owner=$(<"$JAI_GRADLE_LOCK_PID_FILE")
			if [[ "$owner" =~ ^[0-9]+$ ]] && ! kill -0 "$owner" 2>/dev/null; then
				rm -rf "$JAI_GRADLE_LOCK_DIR"
				continue
			fi
		else
			# A process can be killed between mkdir and writing its PID. Give that
			# tiny window a chance to finish, then reclaim the incomplete lock.
			sleep 1
			if [[ ! -f "$JAI_GRADLE_LOCK_PID_FILE" ]]; then
				rm -rf "$JAI_GRADLE_LOCK_DIR"
				continue
			fi
		fi

		if ((reported == 0)); then
			echo "Waiting for another Gradle/test run in this worktree..." >&2
			reported=1
		fi
		sleep 1
	done

	printf '%s\n' "$$" >"$JAI_GRADLE_LOCK_PID_FILE"
	JAI_GRADLE_LOCK_HELD=1
	JAI_GRADLE_LOCK_OWNER_PID=$$
	export JAI_GRADLE_LOCK_HELD JAI_GRADLE_LOCK_OWNER_PID
}

jai_gradle_lock_release() {
	if [[ "${JAI_GRADLE_LOCK_OWNER_PID:-}" == "$$" ]]; then
		rm -rf "$JAI_GRADLE_LOCK_DIR"
		unset JAI_GRADLE_LOCK_OWNER_PID JAI_GRADLE_LOCK_HELD
	fi
}