#!/bin/bash

# ============================================================================
# Run only the tests related to files changed vs HEAD (staged, unstaged and
# untracked). Quiet: failures plus a one-line summary. Falls back to the full
# suite when a change cannot be mapped to tests. Generated by repo_contract.
# ============================================================================

set -euo pipefail

cd "$(git rev-parse --show-toplevel)"
CHANGED=()
while IFS= read -r f; do
    [[ -n "$f" && -e "$f" ]] && CHANGED+=("$f")
done < <({ git diff --name-only HEAD 2>/dev/null || true; git ls-files --others --exclude-standard; } | sort -u)

if [[ -f pnpm-lock.yaml ]]; then PM=pnpm; elif [[ -f yarn.lock ]]; then PM=yarn; else PM=npm; fi

full=0
src=()
for f in "${CHANGED[@]}"; do
    case "$f" in
        package.json | pnpm-lock.yaml | yarn.lock | package-lock.json) full=1 ;;
        *.ts | *.tsx | *.js | *.jsx | *.mjs | *.cjs) src+=("$f") ;;
    esac
done

full_suite() { "$PM" test --silent; }
if [[ $full -eq 0 && ${#CHANGED[@]} -eq 0 ]]; then echo "no changes vs HEAD: nothing to test"; exit 0; fi
if [[ $full -eq 0 && ${#src[@]} -eq 0 ]]; then echo "no js/ts changes: nothing to test"; exit 0; fi
if [[ $full -eq 0 ]] && grep -qs '"vitest"' package.json; then
    "$PM" exec vitest related --run --reporter=dot "${src[@]}"; exit $?
fi
if [[ $full -eq 0 ]] && grep -qs '"jest"' package.json; then
    "$PM" exec jest --findRelatedTests --silent "${src[@]}"; exit $?
fi
echo "cannot map changes to tests: running full suite"
full_suite