#!/bin/bash

# Tester for race_detector exercise
# Tests data race detection and optimization strategies

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

EXERCISE="race_detector"
EXE_PATH=""
PASSED=0
FAILED=0

# Determine the project root directory, which is one level up from the 'testers' directory.
PROJECT_ROOT=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)

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

# --- Find or compile the executable ---
# Priority:
# 1. rendu/executable
# 2. root/executable
# 3. rendu/source -> compile
# 4. root/source -> compile

# Define potential paths for executable and source
EXE_IN_RENDU="$PROJECT_ROOT/rendu/$EXERCISE"
EXE_IN_ROOT="$PROJECT_ROOT/$EXERCISE"
SRC_IN_RENDU="$PROJECT_ROOT/rendu/${EXERCISE}.c"
SRC_IN_ROOT="$PROJECT_ROOT/${EXERCISE}.c"

# Check for existing executable
if [ -f "$EXE_IN_RENDU" ]; then
    EXE_PATH="$EXE_IN_RENDU"
    echo -e "${YELLOW}Found executable in 'rendu' directory.${NC}"
elif [ -f "$EXE_IN_ROOT" ]; then
    EXE_PATH="$EXE_IN_ROOT"
    echo -e "${YELLOW}Found executable in root directory.${NC}"
else
    echo -e "${YELLOW}Executable not found. Attempting to compile from source...${NC}"
    COMPILE_CMD="gcc -Wall -Wextra -Werror -pthread"

    # Check for source file and compile
    if [ -f "$SRC_IN_RENDU" ]; then
        echo "Found source file in 'rendu'. Compiling..."
        if $COMPILE_CMD "$SRC_IN_RENDU" -o "$EXE_IN_RENDU"; then
            EXE_PATH="$EXE_IN_RENDU"
            echo -e "${GREEN}Compilation successful.${NC}"
        else
            echo -e "${RED}✗ Compilation failed for '$SRC_IN_RENDU'.${NC}"
            exit 1
        fi
    elif [ -f "$SRC_IN_ROOT" ]; then
        echo "Found source file in root. Compiling..."
        if $COMPILE_CMD "$SRC_IN_ROOT" -o "$EXE_IN_ROOT"; then
            EXE_PATH="$EXE_IN_ROOT"
            echo -e "${GREEN}Compilation successful.${NC}"
        else
            echo -e "${RED}✗ Compilation failed for '$SRC_IN_ROOT'.${NC}"
            exit 1
        fi
    else
        echo -e "${RED}✗ Neither executable nor source file found for '$EXERCISE'.${NC}"
        echo "Looked for:"
        echo "  - $EXE_IN_RENDU"
        echo "  - $EXE_IN_ROOT"
        echo "  - $SRC_IN_RENDU"
        echo "  - $SRC_IN_ROOT"
        exit 1
    fi
fi

echo -e "${YELLOW}Using executable at: $EXE_PATH${NC}"

# Test 1: Basic execution
echo -n "Test 1: Basic execution - 4 410 200 200... "
timeout 120 "$EXE_PATH" 4 410 200 200 > /tmp/race_detector_output.txt 2>&1
EXIT_CODE=$?

if [ $EXIT_CODE -eq 0 ]; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED (timeout or crash)${NC}"
    ((FAILED++))
fi

OUTPUT=$(cat /tmp/race_detector_output.txt 2>/dev/null)

# Test 2: Multiple iterations/strategies tested
echo -n "Test 2: Multiple test iterations... "
if echo "$OUTPUT" | grep -qiE "(iteration|run|test|strategy)"; then
    ITERATIONS=$(echo "$OUTPUT" | grep -ciE "(iteration|run|test)")
    if [ "$ITERATIONS" -ge 3 ]; then
        echo -e "${GREEN}✓ PASSED${NC} ($ITERATIONS iterations)"
        ((PASSED++))
    else
        echo -e "${YELLOW}⚠ PARTIAL${NC} (found $ITERATIONS iterations)"
        ((PASSED++))
    fi
else
    echo -e "${RED}✗ FAILED${NC}"
    echo "Expected multiple test iterations"
    ((FAILED++))
fi

# Test 3: Reports statistics
echo -n "Test 3: Statistics reporting... "
HAS_STATS=false
if echo "$OUTPUT" | grep -qiE "(race|death|time|performance)"; then
    HAS_STATS=true
fi

if [ "$HAS_STATS" = true ]; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${RED}✗ FAILED${NC}"
    echo "Expected statistics about races, deaths, or performance"
    ((FAILED++))
fi

# Test 4: Different strategies mentioned
echo -n "Test 4: Multiple strategies... "
STRATEGY_COUNT=$(echo "$OUTPUT" | grep -ciE "(strategy|approach|method|optimization)")
if [ "$STRATEGY_COUNT" -ge 2 ]; then
    echo -e "${GREEN}✓ PASSED${NC}"
    ((PASSED++))
else
    echo -e "${YELLOW}⚠ WARNING${NC}"
    echo "Expected different optimization strategies to be tested"
    ((PASSED++))
fi

# Test 5: Helgrind check (if available)
if command -v valgrind &> /dev/null; then
    echo -n "Test 5: Helgrind data race check... "
    # Run a single iteration with helgrind
    timeout 60 valgrind --tool=helgrind "$EXE_PATH" 4 410 200 200 > /tmp/helgrind_output.txt 2>&1
    HELGRIND_OUTPUT=$(cat /tmp/helgrind_output.txt 2>/dev/null)
    
    if echo "$HELGRIND_OUTPUT" | grep -q "ERROR SUMMARY: 0 errors"; then
        echo -e "${GREEN}✓ PASSED (no races detected by helgrind)${NC}"
        ((PASSED++))
    elif echo "$HELGRIND_OUTPUT" | grep -q "Possible data race"; then
        echo -e "${RED}✗ FAILED${NC}"
        echo "Helgrind detected data races!"
        echo "$HELGRIND_OUTPUT" | grep -A 2 "Possible data race" | head -10
        ((FAILED++))
    else
        echo -e "${YELLOW}⚠ WARNING${NC} (Helgrind test inconclusive)"
        ((PASSED++))
    fi
else
    echo -e "${YELLOW}⊘ Test 5: Valgrind not installed, skipping Helgrind test${NC}"
fi

# Test 6: Check for memory leaks with valgrind
if command -v valgrind &> /dev/null; then
    echo -n "Test 6: Memory leak check... "
    VALGRIND_OUTPUT=$(valgrind --leak-check=full --error-exitcode=42 "$EXE_PATH" 4 410 200 200 2>&1)
    if [ $? -ne 42 ]; then
        echo -e "${GREEN}✓ PASSED${NC}"
        ((PASSED++))
    else
        echo -e "${RED}✗ FAILED${NC}"
        echo "Memory leaks detected!"
        echo "$VALGRIND_OUTPUT" | grep -A 5 "LEAK SUMMARY"
        ((FAILED++))
    fi
else
    echo -e "${YELLOW}⊘ Test 6: Valgrind not installed, skipping memory test${NC}"
fi

# Test 7: Thread sanitizer check
if command -v gcc &> /dev/null; then
    echo -n "Test 7: Data race detection (ThreadSanitizer)... "
    # Find the source file to compile
    SOURCE_FILE=""
    if [ -f "$PROJECT_ROOT/rendu/${EXERCISE}.c" ]; then
        SOURCE_FILE="$PROJECT_ROOT/rendu/${EXERCISE}.c"
    elif [ -f "$PROJECT_ROOT/${EXERCISE}.c" ]; then
        SOURCE_FILE="$PROJECT_ROOT/${EXERCISE}.c"
    fi

    if [ -n "$SOURCE_FILE" ]; then
        TSAN_EXE="$PROJECT_ROOT/$(basename "$EXE_PATH")_tsan"
        gcc -Wall -Wextra -Werror -pthread -fsanitize=thread -g "$SOURCE_FILE" -o "$TSAN_EXE" 2>/dev/null
        if [ $? -eq 0 ]; then
            TSAN_OUTPUT=$(timeout 60 "$TSAN_EXE" 4 410 200 200 2>&1)
            if echo "$TSAN_OUTPUT" | grep -q "WARNING: ThreadSanitizer: data race"; then
                echo -e "${RED}✗ FAILED${NC}"
                echo "Data race detected by ThreadSanitizer!"
                echo "$TSAN_OUTPUT" | head -20
                ((FAILED++))
            else
                echo -e "${GREEN}✓ PASSED${NC}"
                ((PASSED++))
            fi
            rm -f "$TSAN_EXE"
        else
            echo -e "${YELLOW}⊘ Could not compile with ThreadSanitizer, skipping test${NC}"
        fi
    else
        echo -e "${YELLOW}⊘ Source file ${EXERCISE}.c not found, skipping ThreadSanitizer test${NC}"
    fi
else
    echo -e "${YELLOW}⊘ Test 7: gcc not found, skipping data race test${NC}"
fi

# Cleanup
rm -f /tmp/race_detector_output.txt /tmp/helgrind_output.txt

# Final summary
echo "----------------------------------------"
if [ $FAILED -eq 0 ]; then
    echo -e "${GREEN}Summary: All $PASSED tests passed for $EXERCISE!${NC}"
    exit 0
else
    echo -e "${RED}Summary: $FAILED out of $((PASSED + FAILED)) tests failed for $EXERCISE.${NC}"
    exit 1
fi