#!/bin/sh
set -eu

assert_sequential_ids() {
	awk '
		BEGIN {
			n = 0
		}

		/^#define MSG_/ {
			if (++n != $3) {
				print "Bad sequential ID:"
				printf "%s:%s:%s\n", FILENAME, NR, $0
				printf "expected: %s\ngot:      %s\n", n, $3
				exit 1
			}
		}
	' "$1"
}

assert_consistent_msg_definitions() {
	awk '
		BEGIN {
			i = 0
			j = 0
		}

		/^#define MSG_/ {
			defines[i++] = $2
		}

		/^\t\[MSG_/ {
			msgs[j++] = substr($0, 3, index($0, "]") - 3)
		}

		END {
			for (n in defines) {
				if (defines[n] != msgs[n]) {
					printf "Order mismatch between #define"
					printf " and usage in MSGS[]:\n"
					printf "#define: %s\nMSGS[]:  %s\n",
						defines[n], msgs[n]
					exit 1
				}
			}
		}
	' "$1"
}

assert_no_unused_msgs() {
	DEFINES="$(mktemp)"
	USAGES="$(mktemp)"
	awk '/^#define MSG_/ { print $2 }' "$f" | sort > "$DEFINES"
	awk -F'_\\(' '
		/_\(MSG_/ { print substr($2, 0, index($2, ")") - 1) }
	' "$f" | sort | uniq > "$USAGES"
	if ! diff "$DEFINES" "$USAGES"; then
		echo 'Some defined MSG_ items not being used' >&2
		exit 1
	fi
}

for f in "$@"; do
	assert_sequential_ids "$f"
	assert_consistent_msg_definitions "$f"
	assert_no_unused_msgs "$f"
done