#!/bin/bash
# Pre-commit hook for monorepo quality checks
# Install: ./scripts/setup-hooks.sh

set -e

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

echo "Running pre-commit checks..."

# Get staged files
STAGED_GO_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.go$' || true)
STAGED_TS_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(ts|tsx|js|jsx)$' || true)

ERRORS=0

# ============================================
# 1. File Length Check (500 lines max)
# ============================================
echo "Checking file lengths..."
for file in $STAGED_GO_FILES $STAGED_TS_FILES; do
    if [ -f "$file" ]; then
        LINE_COUNT=$(wc -l < "$file" | tr -d ' ')
        if [ "$LINE_COUNT" -gt 500 ]; then
            echo -e "${RED}ERROR: $file has $LINE_COUNT lines (max 500)${NC}"
            ERRORS=$((ERRORS + 1))
        fi
    fi
done

# ============================================
# 2. Go Checks (if Go files are staged)
# ============================================
if [ -n "$STAGED_GO_FILES" ]; then
    echo "Running Go checks..."

    # gofmt
    echo "  - gofmt..."
    GOFMT_OUTPUT=$(gofmt -l $STAGED_GO_FILES 2>&1 || true)
    if [ -n "$GOFMT_OUTPUT" ]; then
        echo -e "${YELLOW}Auto-fixing gofmt issues...${NC}"
        gofmt -w $STAGED_GO_FILES
        git add $STAGED_GO_FILES
    fi

    # goimports (if available)
    if command -v goimports &> /dev/null; then
        echo "  - goimports..."
        GOIMPORTS_OUTPUT=$(goimports -l $STAGED_GO_FILES 2>&1 || true)
        if [ -n "$GOIMPORTS_OUTPUT" ]; then
            echo -e "${YELLOW}Auto-fixing goimports issues...${NC}"
            goimports -w $STAGED_GO_FILES
            git add $STAGED_GO_FILES
        fi
    fi

    # golangci-lint (if available)
    if command -v golangci-lint &> /dev/null; then
        echo "  - golangci-lint..."
        # Get unique directories with Go files
        DIRS=$(echo "$STAGED_GO_FILES" | xargs -n1 dirname | sort -u)
        for dir in $DIRS; do
            if ! golangci-lint run "$dir/..." --fast 2>/dev/null; then
                echo -e "${RED}golangci-lint found issues in $dir${NC}"
                ERRORS=$((ERRORS + 1))
            fi
        done
    fi

    # go vet
    echo "  - go vet..."
    if ! go vet ./... 2>/dev/null; then
        echo -e "${RED}go vet found issues${NC}"
        ERRORS=$((ERRORS + 1))
    fi
fi

# ============================================
# 3. TypeScript/JavaScript Checks
# ============================================
if [ -n "$STAGED_TS_FILES" ]; then
    echo "Running TypeScript checks..."

    # Get component directories with TS files
    TS_DIRS=$(echo "$STAGED_TS_FILES" | xargs -n1 dirname | sort -u | grep -E '^apps/' | cut -d'/' -f1-2 | sort -u || true)

    for dir in $TS_DIRS; do
        if [ -f "$dir/package.json" ]; then
            # Use subshell to automatically restore directory on exit
            (
                cd "$dir"

                # Get files relative to this component directory
                COMPONENT_FILES=$(echo "$STAGED_TS_FILES" | grep "^$dir/" | xargs)

                # prettier (if available)
                if [ -f "node_modules/.bin/prettier" ] || command -v prettier &> /dev/null; then
                    echo "  - prettier in $dir..."
                    npx prettier --write $COMPONENT_FILES 2>/dev/null || true
                fi

                # eslint (if available)
                if [ -f "node_modules/.bin/eslint" ] || command -v eslint &> /dev/null; then
                    echo "  - eslint in $dir..."
                    if ! npx eslint --fix $COMPONENT_FILES 2>/dev/null; then
                        echo -e "${RED}eslint found issues in $dir${NC}"
                        # Note: ERRORS can't propagate from subshell, so we exit with error
                        exit 1
                    fi
                fi
            ) || ERRORS=$((ERRORS + 1))
        fi
    done

    # Re-add auto-fixed files
    for file in $STAGED_TS_FILES; do
        if [ -f "$file" ]; then
            git add "$file"
        fi
    done
fi

# ============================================
# 4. Final Result
# ============================================
if [ $ERRORS -gt 0 ]; then
    echo -e "${RED}Pre-commit checks failed with $ERRORS error(s)${NC}"
    exit 1
fi

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