#!/usr/bin/env bash
# Mirrors .github/workflows/frontend-quality.yml (verify job).
# Intentionally not mirrored locally: OSV scan, gitleaks (PR-only on GitHub).
#
# Resume: after a failed push, re-push skips steps whose inputs are unchanged
# (checkpoint in .git/ghabilee-prepush-checkpoint). Force full rerun:
#   PREPUSH_NO_CACHE=1 git push
set -euo pipefail

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

ZERO="0000000000000000000000000000000000000000"
CHECKPOINT_FILE="$ROOT/.git/ghabilee-prepush-checkpoint"

# Same idea as CI path filters — docs/ops-only pushes skip the heavy suite.
FRONTEND_PATH_RE='^(app/|components/|context/|features/|hooks/|services/|lib/|helpers/|validation/|types/|queries/|texts/|constants/|content/|config/|api/|e2e/|public/|styles/|messages/|middleware\.|next\.config|orval\.config|vitest|playwright|openapi\.json$|package\.json$|pnpm-lock\.yaml$|tsconfig|eslint\.config|postcss\.config|tailwind\.config|knip\.json$|\.github/workflows/frontend-quality\.yml$|scripts/)'

PUSH_LOCAL_SHA=""
PUSH_REMOTE_SHA=""
CHECKPOINT_REMOTE_SHA=""

if [[ "${SKIP_PREPUSH_CHECKS:-}" == "1" ]]; then
  echo "⚠ SKIP_PREPUSH_CHECKS=1 — skipping pre-push checks"
  exit 0
fi

run_step() {
  local title="$1"
  shift
  echo ""
  echo "==> $title"
  local start
  start="$(date +%s)"
  "$@"
  echo "    ($(( $(date +%s) - start ))s)"
}

hash_paths() {
  local files=""
  local spec
  for spec in "$@"; do
    local chunk
    chunk="$(git ls-files -co --exclude-standard -- "$spec" 2>/dev/null || true)"
    [[ -n "$chunk" ]] && files+="${chunk}"$'\n'
  done
  files="$(printf '%s' "$files" | LC_ALL=C sort -u | sed '/^$/d')"
  if [[ -z "$files" ]]; then
    printf '%s' "empty"
    return 0
  fi
  printf '%s\0' "$files" | LC_ALL=C sort -z | xargs -0 git hash-object 2>/dev/null | shasum -a 256 | awk '{print $1}'
}

checkpoint_clear() {
  rm -f "$CHECKPOINT_FILE"
}

checkpoint_get_remote_sha() {
  [[ -f "$CHECKPOINT_FILE" ]] || return 0
  grep '^remote_sha=' "$CHECKPOINT_FILE" | head -1 | cut -d= -f2-
}

checkpoint_get_step_hash() {
  local step_id="$1"
  [[ -f "$CHECKPOINT_FILE" ]] || return 0
  grep "^step:${step_id}=" "$CHECKPOINT_FILE" | head -1 | cut -d= -f2- || true
}

checkpoint_mark_step() {
  local step_id="$1"
  local step_hash="$2"
  local remote_line="remote_sha=${PUSH_REMOTE_SHA}"
  local tmp
  tmp="$(mktemp)"
  if [[ -f "$CHECKPOINT_FILE" ]]; then
    grep -v "^step:${step_id}=" "$CHECKPOINT_FILE" | grep -v '^remote_sha=' >"$tmp" || true
  fi
  {
    echo "$remote_line"
    if [[ -s "$tmp" ]]; then
      cat "$tmp"
    fi
    echo "step:${step_id}=${step_hash}"
  } >"$CHECKPOINT_FILE"
  rm -f "$tmp"
}

checkpoint_init_run() {
  CHECKPOINT_REMOTE_SHA="$(checkpoint_get_remote_sha)"
  if [[ "$CHECKPOINT_REMOTE_SHA" != "$PUSH_REMOTE_SHA" ]]; then
    checkpoint_clear
    echo "remote_sha=${PUSH_REMOTE_SHA}" >"$CHECKPOINT_FILE"
  elif [[ ! -f "$CHECKPOINT_FILE" ]]; then
    echo "remote_sha=${PUSH_REMOTE_SHA}" >"$CHECKPOINT_FILE"
  fi
}

checkpoint_step_hash_matches() {
  local step_id="$1"
  local current_hash="$2"
  [[ "${PREPUSH_NO_CACHE:-}" == "1" ]] && return 1
  [[ "$(checkpoint_get_remote_sha)" == "$PUSH_REMOTE_SHA" ]] || return 1
  [[ "$(checkpoint_get_step_hash "$step_id")" == "$current_hash" ]]
}

run_cached_step() {
  local step_id="$1"
  local title="$2"
  local input_hash="$3"
  shift 3

  if checkpoint_step_hash_matches "$step_id" "$input_hash"; then
    echo ""
    echo "==> $title (skipped — inputs unchanged since last run)"
    return 0
  fi

  run_step "$title" "$@"
  checkpoint_mark_step "$step_id" "$input_hash"
}

frontend_orval_drift() {
  pnpm exec orval --config orval.config.ts
  git diff --exit-code -- api/generated
}

frontend_build() {
  NEXT_PUBLIC_API_URL="${NEXT_PUBLIC_API_URL:-http://127.0.0.1:3000}" \
    pnpm exec next build
  pnpm bundle:check
}

run_frontend_quality() {
  checkpoint_init_run

  echo ""
  echo "── Frontend quality (frontend-quality.yml) ──"
  if [[ "${PREPUSH_NO_CACHE:-}" != "1" && -s "$CHECKPOINT_FILE" ]] && grep -q '^step:' "$CHECKPOINT_FILE" 2>/dev/null; then
    echo "   Resume enabled — unchanged steps are skipped (PREPUSH_NO_CACHE=1 to rerun all)."
  fi

  run_cached_step generate_api "Generate API client from committed OpenAPI" \
    "$(hash_paths openapi.json orval.config.ts scripts/generate-api.mjs)" \
    pnpm generate:api

  # Always run full typecheck (no checkpoint skip) — same surface as CI `pnpm typecheck`.
  run_step "TypeScript" pnpm typecheck

  run_cached_step lint "ESLint" \
    "$(hash_paths '*.ts' '*.tsx' '*.js' '*.jsx' eslint.config.mjs)" \
    pnpm lint

  run_cached_step build "Production build and bundle budget" \
    "$(hash_paths app components context features hooks services lib helpers validation types queries texts constants content config api public styles messages scripts '*.ts' '*.tsx' next.config.js postcss.config.mjs tailwind.config.ts package.json pnpm-lock.yaml)" \
    frontend_build

  run_cached_step orval_drift "Verify generated API client" \
    "$(hash_paths openapi.json orval.config.ts api scripts/generate-api.mjs)" \
    frontend_orval_drift

  run_cached_step test "Unit tests" \
    "$(hash_paths '*.ts' '*.tsx' vitest.config.ts vitest.consumer.config.ts package.json pnpm-lock.yaml)" \
    pnpm test

  run_cached_step architecture "Architecture (no circular dependencies)" \
    "$(hash_paths app components context hooks services lib config '*.ts' '*.tsx')" \
    pnpm architecture:check

  run_cached_step pwa "PWA policy" \
    "$(hash_paths scripts/check-service-worker-policy.mjs public package.json '*.ts' '*.tsx')" \
    pnpm pwa:check

  run_cached_step knip "Unused code and dependencies" \
    "$(hash_paths knip.json package.json pnpm-lock.yaml '*.ts' '*.tsx' '*.js' '*.jsx' '*.mjs')" \
    pnpm unused:check

  checkpoint_clear
}

echo ""
echo "Pre-push CI guard — mirrors frontend-quality.yml on matching paths."
echo "Pre-commit already auto-fixes staged files (ESLint --fix + Prettier)."
echo "Skip once: HUSKY=0 git push   or   SKIP_PREPUSH_CHECKS=1 git push"

run_frontend=0
changed_files=""
compared=0
version_checked=0

compare_and_collect() {
  local local_sha="$1"
  local remote_sha="$2"

  [[ "$local_sha" == "$ZERO" ]] && return 0

  if [[ "$remote_sha" == "$ZERO" ]]; then
    if git rev-parse --verify --quiet origin/main >/dev/null; then
      remote_sha="$(git rev-parse origin/main)"
    elif git rev-parse --verify --quiet main >/dev/null; then
      remote_sha="$(git rev-parse main)"
    else
      return 0
    fi
  fi

  [[ "$local_sha" == "$remote_sha" ]] && return 0

  PUSH_LOCAL_SHA="$local_sha"
  PUSH_REMOTE_SHA="$remote_sha"
  compared=1
  changed_files+="$(git diff --name-only "$remote_sha" "$local_sha")"$'\n'
}

check_version_bump() {
  local local_sha="$1"
  local remote_sha="$2"

  [[ "$local_sha" == "$ZERO" || "$local_sha" == "$remote_sha" ]] && return 0

  if [[ "$remote_sha" == "$ZERO" ]]; then
    if git rev-parse --verify --quiet origin/main >/dev/null; then
      remote_sha="$(git rev-parse origin/main)"
    elif git rev-parse --verify --quiet main >/dev/null; then
      remote_sha="$(git rev-parse main)"
    else
      return 0
    fi
  fi

  [[ "$local_sha" == "$remote_sha" ]] && return 0

  node "$ROOT/scripts/check-version-bump.mjs" "$remote_sha" "$local_sha"
  version_checked=1
}

if [[ -t 0 ]]; then
  echo "   (no git refs on stdin — comparing HEAD to origin/main, running full suite)"
  PUSH_LOCAL_SHA="$(git rev-parse HEAD)"
  if git rev-parse --verify --quiet origin/main >/dev/null; then
    PUSH_REMOTE_SHA="$(git rev-parse origin/main)"
  else
    PUSH_REMOTE_SHA="$ZERO"
  fi
  compare_and_collect "$PUSH_LOCAL_SHA" "$PUSH_REMOTE_SHA"
  compared=0
else
  push_refs="$(mktemp)"
  trap 'rm -f "$push_refs"' EXIT
  cat >"$push_refs"
  while read -r _local_ref local_sha _remote_ref remote_sha; do
    compare_and_collect "$local_sha" "$remote_sha"
  done <"$push_refs"
fi

if [[ -z "$PUSH_LOCAL_SHA" ]]; then
  PUSH_LOCAL_SHA="$(git rev-parse HEAD)"
fi
if [[ -z "$PUSH_REMOTE_SHA" || "$PUSH_REMOTE_SHA" == "$ZERO" ]]; then
  if git rev-parse --verify --quiet origin/main >/dev/null; then
    PUSH_REMOTE_SHA="$(git rev-parse origin/main)"
  else
    PUSH_REMOTE_SHA="$ZERO"
  fi
fi

if [[ "$compared" -eq 0 ]]; then
  run_frontend=1
elif echo "$changed_files" | grep -qE "$FRONTEND_PATH_RE"; then
  run_frontend=1
fi

if [[ "$run_frontend" -eq 1 ]]; then
  echo ""
  echo "==> Frontend version bump"
  if [[ -t 0 ]]; then
    check_version_bump "$PUSH_LOCAL_SHA" "$PUSH_REMOTE_SHA"
  else
    while read -r _local_ref local_sha _remote_ref remote_sha; do
      if [[ "$local_sha" != "$ZERO" && "$remote_sha" != "$ZERO" && "$local_sha" != "$remote_sha" ]]; then
        check_version_bump "$local_sha" "$remote_sha"
      fi
    done <"$push_refs"
  fi
  if [[ "$version_checked" -eq 0 ]]; then
    echo "   (no refs to compare — skipping version check)"
  fi
fi

if [[ "$run_frontend" -eq 0 ]]; then
  echo ""
  echo "No frontend code paths in this push — skipping quality suite (same as CI path filters)."
  checkpoint_clear
  echo "✓ Pre-push checks passed"
  echo ""
  exit 0
fi

run_frontend_quality

echo ""
echo "✓ Pre-push checks passed"
echo ""