#!/bin/bash
# Check test coverage against minimum threshold.

set -euo pipefail

COVERAGE_FILE="${1:-.build/coverage.out}"
MIN_COVERAGE="${2:-80}"

if [ ! -f "$COVERAGE_FILE" ]; then
    echo "Error: coverage file not found: $COVERAGE_FILE"
    exit 1
fi

# Extract total coverage percentage from go tool cover output.
COVERAGE=$(go tool cover -func "$COVERAGE_FILE" | awk '/^total:/ { match($0, /[0-9.]+%/); print substr($0, RSTART, RLENGTH-1) }')

if [ -z "$COVERAGE" ]; then
    echo "Error: failed to parse coverage from $COVERAGE_FILE"
    exit 1
fi

echo "Total coverage: ${COVERAGE}%"

# Compare as integer part to keep shell arithmetic simple and portable.
COVERAGE_INT=${COVERAGE%.*}

if [ "$COVERAGE_INT" -lt "$MIN_COVERAGE" ]; then
    echo "Coverage ${COVERAGE}% is below minimum ${MIN_COVERAGE}%"
    exit 1
fi

echo "Coverage check passed"