#!/bin/bash

# Tester for state_monitor exercise
# Tests state monitoring and thread synchronization

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

EXERCISE="state_monitor"
PASSED=0
FAILED=0

echo "========================================"
echo "Testing: $EXERCISE"
echo "========================================"

if [ ! -f "./$EXERCISE" ]; then
    echo -e "${RED}✗ Executable ./$EXERCISE not found${NC}"
    echo "Please compile: gcc -Wall -Wextra -Werror -pthread state_monitor.c -o state_monitor"
    exit 1
fi

# Test 1: Program runs for reasonable time
echo -n "Test 1: Program execution... "
timeout 15 ./$EXERCISE > /tmp/state_monitor_output.txt 2>&1 &
PID=$!
sleep 8
kill $PID 2>/dev/null
wait $PID 2>/dev/null

if [ -f /tmp/state_monitor_output.txt ]; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED${NC}"
    ((FAILED++))
fi

# Test 2: Check for state transitions
echo -n "Test 2: State transitions present... "
OUTPUT=$(cat /tmp/state_monitor_output.txt 2>/dev/null)

if echo "$OUTPUT" | grep -qi "WORKING" && \
   echo "$OUTPUT" | grep -qi "RESTING" && \
   echo "$OUTPUT" | grep -qi "THINKING"; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED${NC}"
    echo "Expected to see WORKING, RESTING, and THINKING states"
    ((FAILED++))
fi

# Test 3: Check for timestamps
echo -n "Test 3: Timestamps present... "
if echo "$OUTPUT" | grep -qE "\[[0-9]+\]"; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED${NC}"
    echo "Expected timestamps in format [timestamp]"
    ((FAILED++))
fi

# Test 4: Check for worker identification
echo -n "Test 4: Worker identification... "
WORKER_COUNT=$(echo "$OUTPUT" | grep -oE "Worker [0-9]+" | sort -u | wc -l)
if [ "$WORKER_COUNT" -ge 3 ]; then
    echo -e "${GREEN}✓ PASSED${NC} (found $WORKER_COUNT workers)"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED${NC}"
    echo "Expected at least 3 workers, found: $WORKER_COUNT"
    ((FAILED++))
fi

# Test 5: Check state duration logic
echo -n "Test 5: State duration verification... "
# WORKING should last ~2s, RESTING ~1s, THINKING ~1.5s
# Extract timestamps and check intervals
WORKING_LINES=$(echo "$OUTPUT" | grep -i "WORKING" | head -10)
if [ -n "$WORKING_LINES" ]; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${YELLOW}⚠ WARNING${NC} - Could not verify state durations"
    ((PASSED++))
fi

# Test 6: Monitor thread functionality
echo -n "Test 6: Monitor warnings (if applicable)... "
if echo "$OUTPUT" | grep -qi "WARNING"; then
    echo -e "${GREEN}✓ PASSED${NC} (monitor detected stuck worker)"
    ((PASSED++))
elif echo "$OUTPUT" | grep -qi "monitor"; then
    echo -e "${GREEN}✓ PASSED${NC} (monitor running)"
    ((PASSED++))
else
    echo -e "${YELLOW}⚠ PARTIAL${NC} - No clear evidence of monitor warnings"
    echo "This is OK if no worker got stuck during the test"
    ((PASSED++))
fi

# Test 7: Memory leak check
if command -v valgrind &> /dev/null; then
    echo -n "Test 7: Memory leak check... "
    timeout 10 valgrind --leak-check=full --error-exitcode=42 ./$EXERCISE > /dev/null 2>&1
    VALGRIND_EXIT=$?
    # Since we use timeout, we need to check differently
    if [ $VALGRIND_EXIT -eq 124 ] || [ $VALGRIND_EXIT -eq 0 ]; then
        echo -e "${GREEN}✓ PASSED${NC}"
        ((PASSED++))
    else
        echo -e "${RED}✗ FAILED${NC}"
        echo "Memory leaks detected!"
        ((FAILED++))
    fi
else
    echo -e "${YELLOW}⊘ Test 7: Valgrind not installed, skipping${NC}"
fi

# Test 8: Thread sanitizer (data race check)
if command -v gcc &> /dev/null; then
    echo -n "Test 8: Data race detection... "
    gcc -Wall -Wextra -Werror -pthread -fsanitize=thread -g state_monitor.c -o state_monitor_tsan 2>/dev/null
    if [ $? -eq 0 ]; then
        timeout 10 ./state_monitor_tsan > /dev/null 2>&1
        TSAN_OUTPUT=$(timeout 10 ./state_monitor_tsan 2>&1)
        if echo "$TSAN_OUTPUT" | grep -q "WARNING: ThreadSanitizer: data race"; then
            echo -e "${RED}✗ FAILED${NC}"
            echo "Data race detected!"
            ((FAILED++))
        else
            echo -e "${GREEN}✓ PASSED${NC}"
            ((PASSED++))
        fi
        rm -f state_monitor_tsan
    else
        echo -e "${YELLOW}⊘ Could not compile with thread sanitizer${NC}"
    fi
else
    echo -e "${YELLOW}⊘ Test 8: gcc not available, skipping${NC}"
fi

# Cleanup
rm -f /tmp/state_monitor_output.txt

# Summary
echo "========================================"
echo -e "Results: ${GREEN}$PASSED passed${NC}, ${RED}$FAILED failed${NC}"
echo "========================================"

[ $FAILED -eq 0 ] && exit 0 || exit 1