#!/bin/bash

# Installation script for Git hooks in Hastebin
# This script sets up pre-commit hooks (tests) and pre-push hooks (unused code scans)

set -e

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

# Get the repository root
REPO_ROOT=$(git rev-parse --show-toplevel 2>/dev/null || echo "$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)")
HOOKS_DIR="$REPO_ROOT/.git/hooks"
PRE_COMMIT_HOOK="$HOOKS_DIR/pre-commit"
SCRIPT_DIR="$REPO_ROOT/scripts"

echo -e "${BLUE}🔧 Installing Git hooks for Hastebin${NC}"
echo ""

# Check if we're in a git repository
if [ ! -d "$REPO_ROOT/.git" ]; then
    echo -e "${RED}❌ Error: Not a git repository${NC}"
    exit 1
fi

# Create hooks directory if it doesn't exist
mkdir -p "$HOOKS_DIR"

# Check if pre-commit hook already exists
if [ -f "$PRE_COMMIT_HOOK" ]; then
    echo -e "${YELLOW}⚠️  Pre-commit hook already exists${NC}"
    read -p "Do you want to overwrite it? (y/N): " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        echo -e "${YELLOW}Skipping hook installation${NC}"
        exit 0
    fi
    # Backup existing hook
    mv "$PRE_COMMIT_HOOK" "$PRE_COMMIT_HOOK.backup.$(date +%Y%m%d_%H%M%S)"
    echo -e "${YELLOW}Backed up existing hook${NC}"
fi

# Create the pre-commit hook
cat > "$PRE_COMMIT_HOOK" << 'HOOK_EOF'
#!/bin/bash

# Git pre-commit hook for Hastebin
# Runs tests before allowing commits to prevent pushing broken code

set -e

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

echo -e "${YELLOW}Running pre-commit checks...${NC}"

# Get the repository root
REPO_ROOT=$(git rev-parse --show-toplevel)
cd "$REPO_ROOT"

# Check if node_modules exists, if not, install dependencies
if [ ! -d "node_modules" ]; then
    echo -e "${YELLOW}Installing dependencies...${NC}"
    npm ci
fi

# Run the core tests (faster than full test suite)
echo -e "${YELLOW}Running core tests...${NC}"
if npm run test:core; then
    echo -e "${GREEN}✅ Core tests passed${NC}"
else
    echo -e "${RED}❌ Core tests failed. Commit aborted.${NC}"
    echo -e "${YELLOW}To skip this check, use: git commit --no-verify${NC}"
    exit 1
fi

# Clean up test artifacts
if [ -d "test-data" ]; then
    rm -rf test-data
fi

echo -e "${GREEN}✅ Pre-commit checks passed${NC}"
exit 0
HOOK_EOF

# Make the hook executable
chmod +x "$PRE_COMMIT_HOOK"

echo -e "${GREEN}✅ Pre-commit hook installed successfully${NC}"

# --- Pre-push hook ---
PRE_PUSH_HOOK="$HOOKS_DIR/pre-push"

# Check if pre-push hook already exists
if [ -f "$PRE_PUSH_HOOK" ]; then
    echo -e "${YELLOW}⚠️  Pre-push hook already exists${NC}"
    read -p "Do you want to overwrite it? (y/N): " -n 1 -r
    echo
    if [[ ! $REPLY =~ ^[Yy]$ ]]; then
        echo -e "${YELLOW}Skipping pre-push hook installation${NC}"
    else
        mv "$PRE_PUSH_HOOK" "$PRE_PUSH_HOOK.backup.$(date +%Y%m%d_%H%M%S)"
        echo -e "${YELLOW}Backed up existing pre-push hook${NC}"
    fi
fi

if [ ! -f "$PRE_PUSH_HOOK" ] || [[ $REPLY =~ ^[Yy]$ ]]; then
    cat > "$PRE_PUSH_HOOK" << 'HOOK_EOF'
#!/bin/bash

# Git pre-push hook for Hastebin
# Scans for unused code/dependencies before pushing

set -e

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

echo -e "${YELLOW}Running pre-push checks...${NC}"

# Get the repository root
REPO_ROOT=$(git rev-parse --show-toplevel)
cd "$REPO_ROOT"

# Check if node_modules exists, if not, install dependencies
if [ ! -d "node_modules" ]; then
    echo -e "${YELLOW}Installing dependencies...${NC}"
    npm ci
fi

# Scan for unused code/dependencies
SCAN_FAILED=0

echo -e "${YELLOW}Scanning for unused files/exports/dependencies (knip)...${NC}"
if npx --yes knip 2>/dev/null; then
    echo -e "${GREEN}✅ knip passed${NC}"
else
    echo -e "${RED}❌ knip found unused code${NC}"
    SCAN_FAILED=1
fi

echo -e "${YELLOW}Scanning for unused npm dependencies (depcheck)...${NC}"
if npx --yes depcheck 2>/dev/null; then
    echo -e "${GREEN}✅ depcheck passed${NC}"
else
    echo -e "${RED}❌ depcheck found issues${NC}"
    SCAN_FAILED=1
fi

if [ $SCAN_FAILED -ne 0 ]; then
    echo -e "${RED}❌ Unused code/dependencies detected. Push aborted.${NC}"
    echo -e "${YELLOW}To skip this check, use: git push --no-verify${NC}"
    exit 1
fi

echo -e "${GREEN}✅ Pre-push checks passed${NC}"
exit 0
HOOK_EOF

    chmod +x "$PRE_PUSH_HOOK"
    echo -e "${GREEN}✅ Pre-push hook installed successfully${NC}"
fi
echo ""
echo -e "${BLUE}Hooks installed:${NC}"
echo -e "${BLUE}  - pre-commit: runs core tests before each commit${NC}"
echo -e "${BLUE}  - pre-push: scans for unused code/deps before each push${NC}"
echo -e "${YELLOW}To skip hooks, use: git commit --no-verify / git push --no-verify${NC}"
echo ""

# Check if dependencies are installed
if [ ! -d "$REPO_ROOT/node_modules" ]; then
    echo -e "${YELLOW}⚠️  Dependencies not found. Installing...${NC}"
    cd "$REPO_ROOT"
    npm ci
    echo -e "${GREEN}✅ Dependencies installed${NC}"
fi

echo -e "${GREEN}🎉 Git hooks installation complete!${NC}"