#!/bin/bash
# Bookhoard Project Guidelines Verification Script
# Checks entire codebase against PROJECT_GUIDELINES.md
# Usage: make verify-guidelines or ./scripts/verify-guidelines.sh

set -e

# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m' # No Color

# Counters
ERRORS=0
WARNINGS=0
PASSED=0

echo -e "${BLUE}=== Bookhoard Project Guidelines Verification ===${NC}"
echo ""

# Function to print error
error_msg() {
    echo -e "${RED}✗ ERROR: $1${NC}"
    ((ERRORS++))
}

# Function to print warning
warning_msg() {
    echo -e "${YELLOW}⚠ WARNING: $1${NC}"
    ((WARNINGS++))
}

# Function to print success
success_msg() {
    echo -e "${GREEN}✓ PASS: $1${NC}"
    ((PASSED++))
}

# Function to print section header
section() {
    echo ""
    echo -e "${BLUE}--- $1 ---${NC}"
}

###############################################################################
## Check 1: No Custom CSS (Frontend & Styling)
###############################################################################
section "Frontend: Custom CSS Check"

# Check for <style> tags in templates
echo "Checking for <style> tags in template files..."
STYLE_FILES=$(grep -l '<style>' templates/*.templ 2>/dev/null || true)
STYLE_COUNT=$(echo "$STYLE_FILES" | grep -v "^$" | wc -l)
if [ "$STYLE_COUNT" -gt 0 ]; then
    error_msg "Found $STYLE_COUNT template files with <style> tags"
    echo "$STYLE_FILES"
else
    success_msg "No <style> tags found in templates"
fi

# Check for .css files
echo "Checking for .css files..."
CSS_FILES=$(find . -name "*.css" -not -path "./node_modules/*" 2>/dev/null | wc -l)
if [ "$CSS_FILES" -gt 0 ]; then
    error_msg "Found $CSS_FILES .css files (should use TailwindCSS)"
    find . -name "*.css" -not -path "./node_modules/*" 2>/dev/null
else
    success_msg "No .css files found"
fi

###############################################################################
## Check 2: No JavaScript Files (Use TypeScript)
###############################################################################
section "Frontend: JavaScript vs TypeScript"

echo "Checking for .js files (should be .ts)..."
JS_FILES=$(find . -name "*.js" -not -path "./node_modules/*" -not -path "./docs/*" 2>/dev/null | wc -l)
if [ "$JS_FILES" -gt 0 ]; then
    error_msg "Found $JS_FILES .js files outside node_modules/"
    find . -name "*.js" -not -path "./node_modules/*" -not -path "./docs/*" 2>/dev/null
else
    success_msg "No .js files found (TypeScript used)"
fi

###############################################################################
## Check 3: No Secrets Committed
###############################################################################
section "Security: No Secrets Committed"

echo "Checking for .env files..."
ENV_FILES=$(find . -name ".env*" -not -name ".env.example" 2>/dev/null | wc -l)
if [ "$ENV_FILES" -gt 0 ]; then
    error_msg "Found .env files in repository"
    find . -name ".env*" -not -name ".env.example" 2>/dev/null
else
    success_msg "No .env files found"
fi

echo "Checking for credentials files..."
CRED_FILES=$(find . -type f \( -name "*credentials*" -o -name "*secret*" -o -name "*password*" \) | grep -v node_modules | grep -v ".git" | wc -l)
if [ "$CRED_FILES" -gt 0 ]; then
    warning_msg "Found $CRED_FILES files with credential-related names"
    find . -type f \( -name "*credentials*" -o -name "*secret*" -o -name "*password*" \) | grep -v node_modules | grep -v ".git"
else
    success_msg "No credential files found"
fi

echo "Checking for secrets in git history..."
if git rev-parse --git-dir > /dev/null 2>&1; then
    SECRETS_IN_HISTORY=$(git log --all --full-history --source -- "*credentials.json" "*.env" 2>/dev/null | wc -l)
    if [ "$SECRETS_IN_HISTORY" -gt 0 ]; then
        warning_msg "Found $SECRETS_IN_HISTORY references to secrets in git history"
    else
        success_msg "No secrets in git history"
    fi
fi

###############################################################################
## Check 4: No Local Server Binaries
###############################################################################
section "Build: No Local Binaries"

echo "Checking for server binaries in repository..."
BINARIES=$(find . -type f -name "bookhoard" -o -name "server" -o -name "bookhoard.exe" -o -name "server.exe" 2>/dev/null | grep -v node_modules | grep -v ".git" | wc -l)
if [ "$BINARIES" -gt 0 ]; then
    error_msg "Found $BINARIES binary files (should build through Dockerfile)"
    find . -type f \( -name "bookhoard" -o -name "server" \) 2>/dev/null | grep -v node_modules | grep -v ".git"
else
    success_msg "No server binaries found"
fi

###############################################################################
## Check 5: No New Migration Files
###############################################################################
section "Database: No New Migration Files"

echo "Checking for migration files..."
if [ -d "migrations" ]; then
    MIGRATION_COUNT=$(find migrations/ -name "*.sql" 2>/dev/null | wc -l)
    if [ "$MIGRATION_COUNT" -gt 1 ]; then
        error_msg "Found $MIGRATION_COUNT migration files (should merge into current one)"
        find migrations/ -name "*.sql" 2>/dev/null
    else
        success_msg "Migration structure OK (single file or no migrations)"
    fi
else
    success_msg "No migrations directory found"
fi

###############################################################################
## Check 6: Go Code Quality
###############################################################################
section "Backend: Go Code Standards"

echo "Checking Go version..."
if [ -f "go.mod" ]; then
    GO_VERSION=$(grep "go " go.mod | head -1)
    success_msg "Go version: $GO_VERSION"
else
    error_msg "go.mod not found"
fi

echo "Checking for pgx v5 driver usage..."
PGX_V4=$(grep -r "github.com/jackc/pgx/v4" . --include="*.go" 2>/dev/null | wc -l)
PGX_V5=$(grep -r "github.com/jackc/pgx/v5" . --include="*.go" 2>/dev/null | wc -l)
if [ "$PGX_V4" -gt 0 ]; then
    error_msg "Found pgx v4 usage (should use v5): $PGX_V4 occurrences"
elif [ "$PGX_V5" -eq 0 ]; then
    warning_msg "No pgx driver found (is database implemented yet?)"
else
    success_msg "Using pgx v5 driver"
fi

echo "Checking for OOP patterns (class keyword)..."
CLASS_PATTERNS=$(grep -r "type [A-Z].*struct {" internal/ --include="*.go" | grep -v "// OOP" | wc -l)
if [ "$CLASS_PATTERNS" -gt 50 ]; then
    warning_msg "Found $CLASS_PATTERNS struct definitions (review for OOP patterns)"
else
    success_msg "Struct definitions within reasonable range"
fi

###############################################################################
## Check 7: File Organization
###############################################################################
section "Code Organization: File Placement"

echo "Checking for .js files in wrong locations..."
JS_IN_WRONG_PLACE=$(find . -name "*.js" -not -path "./node_modules/*" -not -path "./docs/*" -not -path "./build/*" 2>/dev/null | wc -l)
if [ "$JS_IN_WRONG_PLACE" -gt 0 ]; then
    error_msg "Found .js files outside allowed directories"
    find . -name "*.js" -not -path "./node_modules/*" -not -path "./docs/*" -not -path "./build/*" 2>/dev/null
else
    success_msg "JavaScript files properly located"
fi

###############################################################################
## Check 8: Build Verification
###############################################################################
section "Build: Code Compiles"

echo "Testing Go build..."
if go build -o /tmp/bookhoard-test ./cmd/server 2>&1 | tee /tmp/build.log; then
    success_msg "Go build successful"
    rm -f /tmp/bookhoard-test
else
    error_msg "Go build failed - check /tmp/build.log"
    cat /tmp/build.log
fi

###############################################################################
## Check 9: Docker/Podman Files
###############################################################################
section "Containerization: Docker/Podman"

echo "Checking for Dockerfile..."
if [ -f "Dockerfile" ]; then
    success_msg "Dockerfile found (build system uses containers)"
else
    error_msg "Dockerfile not found (required for builds)"
fi

echo "Checking for docker-compose.yml..."
if [ -f "docker-compose.yml" ] || [ -f "docker-compose.yaml" ]; then
    success_msg "docker-compose file found"
else
    error_msg "docker-compose.yml not found"
fi

###############################################################################
## Check 10: Recent Commit Quality
###############################################################################
section "Git: Recent Commit Quality"

echo "Checking for large commits (potential problems)..."
if git rev-parse --git-dir > /dev/null 2>&1; then
    LARGE_COMMITS=$(git log --oneline -10 --pretty=format:"%h %s" | while read hash msg; do
        FILES_CHANGED=$(git diff-tree --no-commit-id --name-only -r $hash | wc -l)
        if [ "$FILES_CHANGED" -gt 10 ]; then
            echo "$hash: $msg ($FILES_CHANGED files)"
        fi
    done | wc -l)
    
    if [ "$LARGE_COMMITS" -gt 0 ]; then
        warning_msg "Found $LARGE_COMMITS recent commits changing >10 files each"
    else
        success_msg "Recent commits are well-scoped"
    fi
fi

###############################################################################
## Check 11: Documentation Updates
###############################################################################
section "Documentation: README Updated"

echo "Checking if docs/ directory exists..."
if [ -d "docs" ]; then
    success_msg "Documentation directory exists"
else
    warning_msg "No docs/ directory found"
fi

###############################################################################
## Summary
###############################################################################
echo ""
echo -e "${BLUE}=== Verification Summary ===${NC}"
echo -e "${GREEN}PASSED: $PASSED${NC}"
echo -e "${YELLOW}WARNINGS: $WARNINGS${NC}"
echo -e "${RED}ERRORS: $ERRORS${NC}"
echo ""

if [ $ERRORS -gt 0 ]; then
    echo -e "${RED}❌ GUIDELINE VERIFICATION FAILED${NC}"
    echo "Please fix the errors above before committing."
    exit 1
elif [ $WARNINGS -gt 0 ]; then
    echo -e "${YELLOW}⚠️  VERIFICATION PASSED WITH WARNINGS${NC}"
    echo "Review warnings above and consider addressing them."
    exit 0
else
    echo -e "${GREEN}✅ ALL GUIDELINE CHECKS PASSED${NC}"
    exit 0
fi