#!/usr/bin/env bash
# Pre-commit hook: runs code quality checks on staged files
# Enable with: git config core.hooksPath .githooks

set -e

ROOT_DIR="$(git rev-parse --show-toplevel)"
ANDROID_DIR="$ROOT_DIR/android"

# --- Kotlin checks (ktlint + detekt) ---

STAGED_KT=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.kts?$' || true)

if [ -n "$STAGED_KT" ]; then
    echo "Running ktlint check..."
    if ! (cd "$ANDROID_DIR" && ./gradlew ktlintCheck --daemon -q 2>/dev/null); then
        echo ""
        echo "ktlint check failed. Run './gradlew ktlintFormat' to auto-fix."
        exit 1
    fi

    echo "Running detekt..."
    if ! (cd "$ANDROID_DIR" && ./gradlew detekt --daemon -q 2>/dev/null); then
        echo ""
        echo "detekt check failed. Fix the issues above before committing."
        exit 1
    fi
fi

# --- Shell script checks (shellcheck) ---

STAGED_SH=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.sh$' || true)

if [ -n "$STAGED_SH" ]; then
    if command -v shellcheck >/dev/null 2>&1; then
        echo "Running shellcheck..."
        FAILED=0
        for file in $STAGED_SH; do
            # Skip build artifacts
            case "$file" in
                android/app/build/*) continue ;;
            esac
            if [ -f "$ROOT_DIR/$file" ]; then
                if ! shellcheck "$ROOT_DIR/$file"; then
                    FAILED=1
                fi
            fi
        done
        if [ "$FAILED" -eq 1 ]; then
            echo ""
            echo "shellcheck failed. Fix the issues above before committing."
            exit 1
        fi
    else
        echo "Warning: shellcheck not installed. Skipping shell script lint."
        echo "Install with: sudo apt-get install shellcheck"
    fi
fi

# --- Markdown lint ---

STAGED_MD=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.md$' || true)

if [ -n "$STAGED_MD" ]; then
    if command -v markdownlint-cli2 >/dev/null 2>&1; then
        echo "Running markdownlint..."
        if ! markdownlint-cli2 $STAGED_MD 2>&1; then
            echo ""
            echo "markdownlint failed. Fix the issues above before committing."
            exit 1
        fi
    else
        echo "Warning: markdownlint-cli2 not installed. Skipping markdown lint."
    fi
fi

# --- WebView/React lint (www/) ---

STAGED_TS=$(git diff --cached --name-only --diff-filter=ACM | grep -E 'android/www/.*\.(ts|tsx)$' || true)

if [ -n "$STAGED_TS" ]; then
    if [ -f "$ANDROID_DIR/www/node_modules/.bin/eslint" ]; then
        echo "Running ESLint on www/..."
        STAGED_TS_REL=$(echo "$STAGED_TS" | sed 's|^android/www/||')
        if ! (cd "$ANDROID_DIR/www" && npx eslint $STAGED_TS_REL 2>&1); then
            echo ""
            echo "ESLint failed. Fix the issues above before committing."
            exit 1
        fi
    else
        echo "Warning: www/node_modules not found. Run 'cd android/www && npm install'."
    fi
fi

# --- Script sync check (post-setup.sh) ---

ROOT_POST_SETUP="$ROOT_DIR/post-setup.sh"
APP_POST_SETUP="$ROOT_DIR/android/app/src/main/assets/post-setup.sh"

STAGED_SYNC=$(git diff --cached --name-only | grep -E '(^post-setup\.sh$|android/app/src/main/assets/post-setup\.sh)' || true)

if [ -n "$STAGED_SYNC" ]; then
    if [ -f "$ROOT_POST_SETUP" ] && [ -f "$APP_POST_SETUP" ]; then
        if ! diff -q "$ROOT_POST_SETUP" "$APP_POST_SETUP" >/dev/null 2>&1; then
            echo ""
            echo "ERROR: post-setup.sh sync mismatch!"
            echo "  Root:  post-setup.sh"
            echo "  App:   android/app/src/main/assets/post-setup.sh"
            echo ""
            echo "Both files must have identical content."
            echo "Copy one to the other and stage both before committing."
            exit 1
        fi
    fi
fi

echo "All checks passed."