#!/usr/bin/env bash
set -euo pipefail

cd "$CLAUDE_PROJECT_DIR"

# Read hook input from stdin
INPUT=$(cat)

# Prevent infinite loops: if already re-engaged by a previous Stop hook, let it stop
STOP_HOOK_ACTIVE=$(echo "$INPUT" | python3 -c "import sys,json; print(json.load(sys.stdin).get('stop_hook_active', False))" 2>/dev/null || echo "False")
if [[ "$STOP_HOOK_ACTIVE" == "True" ]]; then
    exit 0
fi

# Check for uncommitted changes in backend/frontend source
HAS_BACKEND=$(git status --porcelain backend/src/ 2>/dev/null | head -1)
HAS_FRONTEND=$(git status --porcelain frontend/src/ frontend/e2e/ 2>/dev/null | head -1)

# Nothing changed -- skip
if [[ -z "$HAS_BACKEND" && -z "$HAS_FRONTEND" ]]; then
    exit 0
fi

ERRORS=""
PASSED=""

# Run backend tests if Java sources changed
if [[ -n "$HAS_BACKEND" ]]; then
    if OUTPUT=$(cd backend && ./mvnw verify -q 2>&1); then
        PASSED+="✓ Backend tests passed. "
    else
        # Filter: only [ERROR] lines, skip Maven boilerplate
        FILTERED=$(echo "$OUTPUT" | grep -E "^\[ERROR\]" | grep -v -E "Re-run Maven|See |Help 1|full stack trace|Failed to execute goal|For more information|^\[ERROR\] *$" || true)
        ERRORS+="Backend tests failed:\n$FILTERED\n\n"
    fi
fi

# Run frontend tests if TS/Vue sources changed
if [[ -n "$HAS_FRONTEND" ]]; then
    if OUTPUT=$(cd frontend && npm run test:unit -- --run 2>&1); then
        PASSED+="✓ Frontend unit tests passed. "
    else
        ERRORS+="Frontend unit tests failed:\n$OUTPUT\n\n"
    fi

    if OUTPUT=$(cd frontend && npm run test:e2e 2>&1); then
        PASSED+="✓ Frontend E2E tests passed. "
    else
        ERRORS+="Frontend E2E tests failed:\n$OUTPUT\n\n"
    fi
fi

if [[ -n "$ERRORS" ]]; then
    # Block stopping — re-engage the agent to fix failures
    ESCAPED=$(printf '%s' "$ERRORS" | python3 -c "import sys,json; print(json.dumps(sys.stdin.read()))")
    echo "{\"decision\":\"block\",\"reason\":$ESCAPED}"
else
    # Success — allow stopping, report via stopReason
    echo "{\"decision\":\"approve\",\"reason\":\"$PASSED\"}"
fi
