#!/bin/sh
# Tests for scripts/migrate-layout.sh
set -e

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
PROJECT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
TOOL="$PROJECT_DIR/scripts/migrate-layout.sh"
FIXTURE_SRC="$SCRIPT_DIR/fixtures/old-layout"

PASS=0
FAIL=0

pass() { echo "  [pass]   $1";  PASS=$((PASS+1)); }
fail() { echo "  [FAIL]   $1"; echo "    $2"; FAIL=$((FAIL+1)); }

setup_tmp() {
    TMP=$(mktemp -d /tmp/migrate-test.XXXXXX)
    cp -a "$FIXTURE_SRC"/. "$TMP"/
    echo "$TMP"
}

# Test 1: --dry-run does not modify anything
TMP=$(setup_tmp)
BEFORE=$(find "$TMP" | sort)
"$TOOL" --dry-run --config-dir "$TMP" > /dev/null
AFTER=$(find "$TMP" | sort)
if [ "$BEFORE" = "$AFTER" ]; then
    pass "dry-run leaves tree unchanged"
else
    fail "dry-run leaves tree unchanged" "tree changed"
fi
rm -rf "$TMP"

# Test 2: --apply migrates flat layout to per-service directories
TMP=$(setup_tmp)
"$TOOL" --apply --config-dir "$TMP" > /dev/null
if [ -f "$TMP/services/cron/service.toml" ] && \
   [ -f "$TMP/services/filesystem/service.toml" ] && \
   [ -f "$TMP/services/filesystem/start.sh" ]; then
    pass "apply creates services/<name>/service.toml"
else
    fail "apply creates services/<name>/service.toml" "missing expected files"
fi
rm -rf "$TMP"

# Test 3: --apply retargets enabled.d symlinks to directories
TMP=$(setup_tmp)
"$TOOL" --apply --config-dir "$TMP" > /dev/null
target=$(readlink "$TMP/enabled.d/cron")
case "$target" in
    *services/cron) pass "enabled.d symlink targets directory" ;;
    *)              fail "enabled.d symlink targets directory" "got '$target'" ;;
esac
rm -rf "$TMP"

# Test 4: --apply is idempotent
TMP=$(setup_tmp)
"$TOOL" --apply --config-dir "$TMP" > /dev/null
SECOND=$("$TOOL" --apply --config-dir "$TMP" 2>&1)
if echo "$SECOND" | grep -q "already migrated\|nothing to migrate\|no changes"; then
    pass "apply is idempotent"
else
    fail "apply is idempotent" "second run did not report no-op"
fi
rm -rf "$TMP"

# Test 5: refuses when both old and new layout coexist
TMP=$(setup_tmp)
mkdir -p "$TMP/services/cron"
cp "$TMP/cron.toml" "$TMP/services/cron/service.toml"
set +e
"$TOOL" --apply --config-dir "$TMP" > /dev/null 2>&1
rc=$?
set -e
if [ "$rc" -ne 0 ]; then
    pass "refuses on ambiguous old+new coexistence"
else
    fail "refuses on ambiguous old+new coexistence" "exit was 0"
fi
rm -rf "$TMP"

echo
echo "passed: $PASS  failed: $FAIL"
[ "$FAIL" -eq 0 ]