#!/bin/bash
# Pre-commit hook for linting changed files
# Runs by default. Set DISABLE_PRECOMMIT_LINT=1 in environment or .env file to skip.
#
# To disable:
#   1. Add DISABLE_PRECOMMIT_LINT=1 to your .env file or export it in your shell

# Load .env file if it exists (to check for DISABLE_PRECOMMIT_LINT)
if [ -f .env ]; then
  # Only export DISABLE_PRECOMMIT_LINT from .env, don't expose other secrets
  DISABLE_PRECOMMIT_LINT_FROM_ENV=$(grep -E '^DISABLE_PRECOMMIT_LINT=' .env | cut -d '=' -f2-)
  if [ -n "$DISABLE_PRECOMMIT_LINT_FROM_ENV" ]; then
    export DISABLE_PRECOMMIT_LINT="$DISABLE_PRECOMMIT_LINT_FROM_ENV"
  fi
fi

# Skip if DISABLE_PRECOMMIT_LINT is set and non-empty
if [ -n "$DISABLE_PRECOMMIT_LINT" ]; then
  exit 0
fi

echo "Running pre-commit lint checks..."

# Get list of staged JS/TS files. Biome ignores declaration files, so exclude them
# here instead of failing d.ts-only commits with "No files were processed".
STAGED_JS_TS_FILES=$(
  git diff --cached --name-only --diff-filter=ACMRTUXB |
    grep -E '\.(js|ts|tsx)$' |
    grep -Ev '\.d\.ts$' || true
)

# Get list of staged CSS/HTML/MD/YAML files for Prettier
STAGED_PRETTIER_FILES=$(git diff --cached --name-only --diff-filter=ACMRTUXB | grep -E '\.(css|scss|html|md|mdc|mdx|yaml|yml)$' || true)

# Track if we have any errors
HAS_ERRORS=0

# Run Biome lint on staged JS/TS files
if [ -n "$STAGED_JS_TS_FILES" ]; then
  echo "Linting JS/TS files with Biome..."
  echo "$STAGED_JS_TS_FILES" | xargs npx @biomejs/biome check --write
  BIOME_EXIT=$?

  if [ $BIOME_EXIT -ne 0 ]; then
    echo "Biome lint failed. Please fix the errors and try again."
    HAS_ERRORS=1
  else
    # Re-add files that were auto-fixed
    echo "$STAGED_JS_TS_FILES" | xargs git add
  fi
fi

# Run Prettier on staged CSS/HTML/MD/YAML files
if [ -n "$STAGED_PRETTIER_FILES" ]; then
  echo "Formatting with Prettier..."
  echo "$STAGED_PRETTIER_FILES" | xargs npx prettier --write
  PRETTIER_EXIT=$?

  if [ $PRETTIER_EXIT -ne 0 ]; then
    echo "Prettier formatting failed. Please fix the errors and try again."
    HAS_ERRORS=1
  else
    # Re-add files that were auto-fixed
    echo "$STAGED_PRETTIER_FILES" | xargs git add
  fi
fi

if [ $HAS_ERRORS -ne 0 ]; then
  exit 1
fi

echo "Pre-commit lint checks passed!"
exit 0