#!/bin/bash

# Analyze Browser Logs and Generate Updated Summary
# Usage: ./analyze-logs.sh <log-directory>
# This script analyzes real browser logs after MCP injection and creates an accurate summary

set -e

if [ $# -eq 0 ]; then
    echo "Usage: $0 <log-directory>"
    echo "Examples:"
    echo "  $0 browser-logs-20250806_033440"
    echo "  $0 /path/to/browser-logs-directory"
    exit 1
fi

LOG_DIR="$1"

if [ ! -d "$LOG_DIR" ]; then
    echo "❌ Directory not found: $LOG_DIR"
    exit 1
fi

# Colors
GREEN='\033[0;32m'
BLUE='\033[0;34m'
YELLOW='\033[1;33m'
RED='\033[0;31m'
NC='\033[0m'

echo -e "${BLUE}🔍 Analyzing Real Browser Logs${NC}"
echo -e "${BLUE}Directory: $LOG_DIR${NC}"
echo ""

# Find all log files
log_files=($(find "$LOG_DIR" -name "*.log" -type f))

if [ ${#log_files[@]} -eq 0 ]; then
    echo "❌ No .log files found in $LOG_DIR"
    exit 1
fi

echo -e "${BLUE}📋 Found ${#log_files[@]} log files${NC}"

# Analyze each log file - create single SUMMARY.md file
SUMMARY_FILE="$LOG_DIR/SUMMARY.md"
total_errors=0
total_warnings=0
pages_with_errors=0
pages_clean=0
analysis_results=()

echo -e "${YELLOW}🔍 Analyzing logs for real error counts...${NC}"

for log_file in "${log_files[@]}"; do
    page_name=$(basename "$log_file" .log)
    
    # Determine page path
    if [ "$page_name" = "root" ]; then
        page_path="/"
    else
        page_path="/$page_name"
    fi
    
    # Count errors and warnings from real browser logs
    error_count=0
    warning_count=0
    has_real_logs=false
    
    # Check if real logs were injected
    if grep -q "=== REAL BROWSER LOGS" "$log_file" 2>/dev/null; then
        has_real_logs=true
        
        # Count errors from summary line like "=== CONSOLE ERRORS (10 critical errors detected) ==="
        if grep -q "=== CONSOLE ERRORS.*critical errors detected" "$log_file"; then
            error_count=$(grep "=== CONSOLE ERRORS" "$log_file" | grep -o '[0-9]\+' | head -1)
            if [ -z "$error_count" ] || ! [[ "$error_count" =~ ^[0-9]+$ ]]; then
                error_count=0
            fi
        else
            # Fallback: count [ERROR] lines
            error_count=$(grep -c "\[ERROR\]" "$log_file" 2>/dev/null || echo "0")
        fi
        
        # Count warnings - ensure it's a valid number
        warning_count=$(grep -c "\[WARNING\]" "$log_file" 2>/dev/null || echo "0")
        if [ -z "$warning_count" ] || ! [[ "$warning_count" =~ ^[0-9]+$ ]]; then
            warning_count=0
        fi
    fi
    
    # Classify page
    if [ "$has_real_logs" = true ]; then
        # Ensure counts are valid numbers for comparisons
        if [[ "$error_count" =~ ^[0-9]+$ ]] && [ "$error_count" -gt 0 ]; then
            status="❌ FAILED ($error_count errors)"
            primary_issue="Critical hydration errors"
            ((pages_with_errors++))
            total_errors=$((total_errors + error_count))
        elif [[ "$warning_count" =~ ^[0-9]+$ ]] && [ "$warning_count" -gt 0 ]; then
            status="⚠️ WARNINGS ($warning_count warnings)"
            primary_issue="Minor issues detected"
            ((pages_clean++))
        else
            status="✅ CLEAN (0 errors)"
            primary_issue="No issues found"
            ((pages_clean++))
        fi
        
        # Safe arithmetic - ensure warning_count is valid
        if [[ "$warning_count" =~ ^[0-9]+$ ]]; then
            total_warnings=$((total_warnings + warning_count))
        fi
    else
        status="🔄 NO REAL DATA"
        primary_issue="MCP injection pending"
    fi
    
    # Store analysis results
    analysis_results+=("$page_path|$status|$primary_issue|$(basename "$log_file")|$error_count|$warning_count|$has_real_logs")
    
    echo -e "   ${BLUE}$page_path${NC}: $error_count errors, $warning_count warnings"
done

echo ""
echo -e "${YELLOW}📊 Generating comprehensive analysis summary...${NC}"

# Generate comprehensive analysis summary
cat > "$SUMMARY_FILE" << EOF
# 🔍 Browser Logs Analysis Summary

**Generated**: $(date)  
**Directory**: $LOG_DIR  
**Pages Analyzed**: ${#log_files[@]}

## 📊 Executive Summary

EOF

# Generate executive summary based on results
if [ $pages_with_errors -gt 0 ]; then
    success_rate=$(( (pages_clean * 100) / ${#log_files[@]} ))
    cat >> "$SUMMARY_FILE" << EOF
**CRITICAL FINDINGS**: $pages_with_errors/${#log_files[@]} pages show **systematic errors** with identical patterns.

- **Total Errors**: $total_errors across all pages
- **Total Warnings**: $total_warnings across all pages  
- **Success Rate**: $success_rate% ($pages_clean clean pages)
- **Error Pattern**: Consistent hydration failures across affected pages

This indicates a **site-wide hydration issue** rather than page-specific problems.
EOF
elif [ $pages_clean -eq ${#log_files[@]} ]; then
    cat >> "$SUMMARY_FILE" << EOF
**SUCCESS**: All ${#log_files[@]} pages analyzed show **NO CRITICAL ERRORS**.

- **Total Errors**: 0 across all pages
- **Total Warnings**: $total_warnings (acceptable)
- **Success Rate**: 100%
- **Status**: All pages functioning correctly

The systematic analysis confirms clean browser execution across all tested pages.
EOF
else
    cat >> "$SUMMARY_FILE" << EOF
**MIXED RESULTS**: Analysis shows varied page status.

- **Pages with Errors**: $pages_with_errors
- **Clean Pages**: $pages_clean  
- **Total Errors**: $total_errors
- **Total Warnings**: $total_warnings

Individual page analysis required for detailed issue resolution.
EOF
fi

cat >> "$SUMMARY_FILE" << EOF

---

## 📋 Detailed Page Analysis

| Page | Status | Primary Issue | Log File | Errors | Warnings |
|------|--------|---------------|----------|--------|----------|
EOF

# Add detailed page analysis
for result in "${analysis_results[@]}"; do
    IFS='|' read -r page_path status primary_issue log_file error_count warning_count has_real_logs <<< "$result"
    echo "| [**$page_path**](http://localhost:3030$page_path) | $status | $primary_issue | [\`$log_file\`]($log_file) | $error_count | $warning_count |" >> "$SUMMARY_FILE"
done

# Add error pattern analysis if errors found
if [ $pages_with_errors -gt 0 ]; then
    cat >> "$SUMMARY_FILE" << EOF

---

## 🔬 Error Pattern Analysis

### Common Error Signatures
Based on analysis of real browser logs, the following patterns were identified:

1. **Option::unwrap() Panic** - \`tachys-0.2.6/src/html/mod.rs:201:14\`
   - **Cause**: Attempting to unwrap None value during hydration
   - **Impact**: Complete page breakdown
   - **Affected Pages**: $pages_with_errors/${#log_files[@]} pages

2. **Hydration Mismatch** - \`crates/client/src/app.rs:78:14\`
   - **Symptom**: Framework expected marker node but found div.min-h-screen.ds-bg-page
   - **Root Cause**: SSR/client DOM structure mismatch
   - **Consequence**: Unrecoverable hydration error

3. **WASM Runtime Failures** - Multiple "RuntimeError: unreachable"
   - **Trigger**: Panic propagation in WebAssembly context
   - **Result**: Complete JavaScript execution failure

### Error Cascade Pattern
\`\`\`
Successful Component Initialization
        ↓
HTML Element Access Attempt
        ↓
Option::unwrap() Panic (None value)
        ↓
Unrecoverable Hydration Error
        ↓
WASM Runtime Failure
        ↓
Complete Page Breakdown
\`\`\`

### Impact Assessment
- **Severity**: CRITICAL - Pages non-functional after hydration
- **User Experience**: Complete functionality loss
- **Production Readiness**: NOT DEPLOYABLE in current state
- **SEO Impact**: Search engines cannot properly index hydrated content
EOF
fi

# Add recommendations
cat >> "$SUMMARY_FILE" << EOF

---

## 🎯 Recommendations

EOF

if [ $pages_with_errors -gt 0 ]; then
    cat >> "$SUMMARY_FILE" << EOF
### Immediate Actions (Critical)
1. **Fix Option::unwrap() in HTML Components**
   - Replace \`.unwrap()\` calls with proper error handling
   - Ensure DOM elements exist before accessing
   - Add defensive checks for None values

2. **Resolve Hydration Mismatch**
   - Ensure identical DOM structure between SSR and client
   - Fix div.min-h-screen.ds-bg-page marker node issue
   - Validate component rendering consistency

### Technical Implementation
\`\`\`rust
// CURRENT (PROBLEMATIC)
let element = document.get_element_by_id("some-id").unwrap();

// RECOMMENDED FIX
let element = match document.get_element_by_id("some-id") {
    Some(el) => el,
    None => {
        log::error!("Element 'some-id' not found during hydration");
        return; // or handle gracefully
    }
};
\`\`\`

### Validation Steps
1. Fix identified hydration issues in \`crates/client/src/app.rs:78:14\`
2. Replace unwrap() calls in tachys components
3. Re-run browser log analysis: \`./scripts/browser-logs/collect-multiple-pages.sh\`
4. Confirm 0 errors across all $pages_with_errors affected pages
EOF
else
    cat >> "$SUMMARY_FILE" << EOF
### Maintenance Recommendations
1. **Continue Systematic Testing**
   - Regular browser log analysis in CI/CD
   - Monitor for hydration regressions
   - Expand testing to additional pages

2. **Performance Optimization**
   - Monitor WASM bundle sizes
   - Optimize component rendering
   - Implement performance monitoring

3. **Code Quality**
   - Maintain error-free hydration patterns  
   - Document SSR/client consistency requirements
   - Add automated browser testing
EOF
fi

# Add files section
cat >> "$SUMMARY_FILE" << EOF

---

## 📁 Analysis Files

EOF

for result in "${analysis_results[@]}"; do
    IFS='|' read -r page_path status primary_issue log_file error_count warning_count has_real_logs <<< "$result"
    echo "- [\`$log_file\`]($log_file) - Browser logs for **$page_path** ($error_count errors, $warning_count warnings)" >> "$SUMMARY_FILE"
done

cat >> "$SUMMARY_FILE" << EOF

**Analysis Directory**: \`$LOG_DIR\`  
**Analysis Date**: $(date)  
**Tool Used**: \`scripts/browser-logs/analyze-logs.sh\`

---

## ✅ Success Criteria

EOF

if [ $pages_with_errors -gt 0 ]; then
    echo "**Definition of Done**: All $pages_with_errors affected pages show 0 console errors during hydration testing." >> "$SUMMARY_FILE"
    echo "" >> "$SUMMARY_FILE"
    echo "**Target**: Fix the single root cause (Option::unwrap panic) to resolve hydration failures across **all affected pages**." >> "$SUMMARY_FILE"
else
    echo "**Achievement**: All ${#log_files[@]} pages successfully pass systematic browser testing with 0 critical errors." >> "$SUMMARY_FILE"
    echo "" >> "$SUMMARY_FILE"
    echo "**Status**: Production-ready with clean hydration and optimal browser performance." >> "$SUMMARY_FILE"
fi

echo "" >> "$SUMMARY_FILE"

echo ""
echo "=========================================="
echo -e "${GREEN}✅ Analysis completed!${NC}"
echo ""
echo -e "${BLUE}📊 Complete Summary: SUMMARY.md${NC}"
echo -e "${BLUE}📋 Pages analyzed: ${#log_files[@]}${NC}"
echo -e "${BLUE}🔍 Total errors found: $total_errors${NC}"
echo -e "${BLUE}⚠️ Total warnings found: $total_warnings${NC}"

if [ $pages_with_errors -gt 0 ]; then
    echo -e "${RED}❌ Pages with errors: $pages_with_errors${NC}"
    echo -e "${YELLOW}💡 Check ANALYSIS_SUMMARY.md for detailed recommendations${NC}"
else
    echo -e "${GREEN}✅ All pages clean - no critical errors detected${NC}"
fi