#!/usr/bin/env bash

set -euo pipefail

repo_root=$(git rev-parse --show-toplevel)
cd "$repo_root"

printf 'Running auto-fixers and shell_check before committing...\n'

# Get list of staged shell files
mapfile -t staged_files < <(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(sh|bash|zsh)$' || true)

if [[ ${#staged_files[@]} -gt 0 ]]; then
  printf 'Auto-fixing %d shell file(s)...\n' "${#staged_files[@]}"

  # Auto-fix with shfmt if available
  if command -v shfmt > /dev/null 2>&1; then
    printf '  → Running shfmt...\n'
    for file in "${staged_files[@]}"; do
      if [[ -f $file ]]; then
        shfmt -w "$file" 2> /dev/null || true
      fi
    done
  fi

  # Re-stage the auto-fixed files
  for file in "${staged_files[@]}"; do
    if [[ -f $file ]]; then
      git add "$file"
    fi
  done

  printf '  ✓ Auto-fixes applied and staged\n'
fi

printf 'Running shell_check validation...\n'

# Run shell_check to validate all checks
# Note: We only validate the staged files since we just auto-formatted them
# Validate only shellcheck, not shfmt (we already applied formatting)
mapfile -d '' -t staged_shell_files < <(git diff --cached --name-only --diff-filter=ACM -z | grep -zE '\.(sh|bash|zsh)$' || true)

if [[ ${#staged_shell_files[@]} -gt 0 ]]; then
  # Run shellcheck on staged files
  # -x: follow source directives
  # -S warning: only fail on warning or higher (not info-level SC1091)
  if command -v shellcheck > /dev/null 2>&1; then
    if ! shellcheck -x -S warning "${staged_shell_files[@]}" 2>&1; then
      printf '\nCommit aborted: shellcheck found issues.\n' >&2
      printf 'Fix the remaining problems and retry the commit.\n' >&2
      exit 1
    fi
  fi
fi

printf 'shell_check passed.\n'

# Run duplicate code detection
printf 'Running duplicate code detection...\n'

JSCPD_BIN="${HOME}/.local/node_modules/.bin/jscpd"

# Install jscpd if not present
if [[ ! -x $JSCPD_BIN ]]; then
  printf '  → jscpd not found, installing...\n'
  if ! npm install --prefix ~/.local jscpd 2>&1; then
    printf '\nCommit aborted: failed to install jscpd.\n' >&2
    printf 'Please install manually: npm install --prefix ~/.local jscpd\n' >&2
    exit 1
  fi
  printf '  ✓ jscpd installed\n'
fi

# Run jscpd and capture output
# --min-lines 14: minimum 14 lines to consider a clone (ignores small boilerplate)
# --min-tokens 25: minimum 25 tokens to consider a clone
# --threshold 2: fail if more than 2% duplication
jscpd_output=$("$JSCPD_BIN" \
  --pattern "**/*.sh" \
  --min-lines 14 \
  --min-tokens 25 \
  --threshold 2 \
  --reporters "console" \
  --ignore "**/node_modules/**,**/.git/**,**/misc/testsAndMisc-bash/**,**/*.txt" \
  . 2>&1) || jscpd_exit=$?

if [[ ${jscpd_exit:-0} -ne 0 ]]; then
  printf '\n%s\n' "$jscpd_output"
  printf '\nCommit aborted: duplicate code exceeds 2%% threshold.\n' >&2
  printf 'Consider extracting common code to scripts/lib/common.sh\n' >&2
  printf 'To see all duplicates: %s --pattern "**/*.sh" --min-lines 5 .\n' "$JSCPD_BIN" >&2
  exit 1
fi
printf '  ✓ Duplication check passed (under 2%% threshold)\n'

printf 'All checks passed. Proceeding with commit.\n'