#!/usr/bin/env bash
set -euo pipefail

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
COMPOSE_FILE="${ROOT_DIR}/deploy/docker-compose.dev.yml"
BACKEND_ENV="${ROOT_DIR}/backend/.env"
BACKEND_ENV_EXAMPLE="${ROOT_DIR}/backend/.env.example"
BACKEND_PORT="${DEV_BACKEND_PORT:-8080}"
FRONTEND_PORT="${DEV_FRONTEND_PORT:-5173}"
BACKEND_HEALTH_URL="${DEV_BACKEND_HEALTH_URL:-http://127.0.0.1:${BACKEND_PORT}/health}"
FRONTEND_HEALTH_URL="${DEV_FRONTEND_HEALTH_URL:-http://127.0.0.1:${FRONTEND_PORT}/}"
HTTP_READY_TIMEOUT="${DEV_HTTP_READY_TIMEOUT:-120}"

BACKEND_PID=""
FRONTEND_PID=""
CLEANED_UP=0

# 颜色定义
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[1;34m'
NC='\033[0m'

log() {
  printf "${BLUE}[dev]${NC} %s\n" "$*"
}

log_success() {
  printf "${GREEN}[dev]${NC} %s\n" "$*"
}

log_warn() {
  printf "${YELLOW}[dev]${NC} %s\n" "$*"
}

log_error() {
  printf "${RED}[dev]${NC} %s\n" "$*" >&2
}

need_cmd() {
  if ! command -v "$1" >/dev/null 2>&1; then
    log_error "缺少命令：$1"
    exit 1
  fi
}

show_help() {
  cat << EOF
用法: ./scripts/dev.sh [选项]

选项:
  --reset-db      重置数据库（删除并重建）
  --seed-only     仅重新加载种子数据
  --no-frontend   不启动前端
  --no-backend    不启动后端
  -h, --help      显示帮助信息

环境变量:
  DEV_RESET_DB=1  等同于 --reset-db
  DEV_BACKEND_PORT=8080
                  后端端口占用检查端口
  DEV_FRONTEND_PORT=5173
                  前端端口占用检查端口
  DEV_BACKEND_HEALTH_URL=http://127.0.0.1:8080/health
                  后端健康检查地址
  DEV_FRONTEND_HEALTH_URL=http://127.0.0.1:5173/
                  前端健康检查地址
  DEV_HTTP_READY_TIMEOUT=120
                  HTTP 服务就绪等待秒数

示例:
  ./scripts/dev.sh                 # 正常启动
  ./scripts/dev.sh --reset-db      # 重置数据库后启动
  ./scripts/dev.sh --seed-only     # 重新加载种子数据
EOF
  exit 0
}

# 参数解析
RESET_DB="${DEV_RESET_DB:-0}"
SEED_ONLY=0
NO_FRONTEND=0
NO_BACKEND=0

while [[ $# -gt 0 ]]; do
  case "$1" in
    --reset-db)
      RESET_DB=1
      shift
      ;;
    --seed-only)
      SEED_ONLY=1
      shift
      ;;
    --no-frontend)
      NO_FRONTEND=1
      shift
      ;;
    --no-backend)
      NO_BACKEND=1
      shift
      ;;
    -h|--help)
      show_help
      ;;
    *)
      log_error "未知选项: $1"
      show_help
      ;;
  esac
done

cleanup() {
  if [[ "${CLEANED_UP}" == "1" ]]; then
    return
  fi
  CLEANED_UP=1

  if [[ -z "${FRONTEND_PID}" && -z "${BACKEND_PID}" ]]; then
    return
  fi

  log "正在停止前后端开发进程..."
  if [[ -n "${FRONTEND_PID}" ]] && kill -0 "${FRONTEND_PID}" >/dev/null 2>&1; then
    kill "${FRONTEND_PID}" >/dev/null 2>&1 || true
  fi
  if [[ -n "${BACKEND_PID}" ]] && kill -0 "${BACKEND_PID}" >/dev/null 2>&1; then
    kill "${BACKEND_PID}" >/dev/null 2>&1 || true
  fi
}

wait_container_healthy() {
  local container_name="$1"
  local label="$2"
  local attempt

  log "等待 ${label} 就绪..."
  for attempt in {1..60}; do
    local status
    status="$(docker inspect -f '{{if .State.Health}}{{.State.Health.Status}}{{else}}{{.State.Status}}{{end}}' "${container_name}" 2>/dev/null || true)"
    if [[ "${status}" == "healthy" || "${status}" == "running" ]]; then
      log "${label} 已就绪"
      return 0
    fi
    sleep 2
  done

  printf "%s 启动超时，请检查：docker logs %s\n" "${label}" "${container_name}" >&2
  exit 1
}

wait_http_ready() {
  local url="$1"
  local label="$2"
  local pid="${3:-}"
  local attempt

  log "等待 ${label} HTTP 服务就绪..."
  for ((attempt = 1; attempt <= HTTP_READY_TIMEOUT; attempt++)); do
    if [[ -n "${pid}" ]] && ! kill -0 "${pid}" >/dev/null 2>&1; then
      wait "${pid}" || true
      log_error "${label} 进程已退出，请检查上方日志"
      exit 1
    fi

    if curl -fsS --max-time 2 "${url}" >/dev/null 2>&1; then
      log_success "${label} 已就绪：${url}"
      return 0
    fi

    sleep 1
  done

  log_error "${label} HTTP 服务启动超时：${url}"
  exit 1
}

ensure_port_free() {
  local port="$1"
  local label="$2"

  if command -v lsof >/dev/null 2>&1; then
    if lsof -nP -iTCP:"${port}" -sTCP:LISTEN >/dev/null 2>&1; then
      log_error "${label}端口 ${port} 已被占用，请先停止旧进程或调整端口"
      exit 1
    fi
    return 0
  fi

  if command -v nc >/dev/null 2>&1; then
    if nc -z 127.0.0.1 "${port}" >/dev/null 2>&1; then
      log_error "${label}端口 ${port} 已被占用，请先停止旧进程或调整端口"
      exit 1
    fi
    return 0
  fi

  log_warn "未找到 lsof 或 nc，跳过 ${label}端口 ${port} 占用检查"
}

mysql_root() {
  docker exec -i -e MYSQL_PWD=rootsecret hfb-mysql mysql -uroot "$@"
}

mysql_hfb() {
  docker exec -i -e MYSQL_PWD=secret hfb-mysql mysql -uhfb "$@"
}

init_database() {
  if [[ "${RESET_DB}" == "1" ]]; then
    log_warn "重置数据库..."
    mysql_root -e \
      "DROP DATABASE IF EXISTS hfb_sys; CREATE DATABASE hfb_sys CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
  fi

  local table_count
  table_count="$(
    mysql_hfb -N -s -e \
      "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = 'hfb_sys' AND table_name = 'users';" 2>/dev/null
  )"

  if [[ "${table_count}" == "0" ]]; then
    log "首次启动，初始化数据库..."
    local migration
    for migration in "${ROOT_DIR}"/backend/migrations/*.sql; do
      log "执行迁移：$(basename "${migration}")"
      mysql_hfb --default-character-set=utf8mb4 hfb_sys < "${migration}"
    done
    log_success "数据库初始化完成"
  elif [[ "${SEED_ONLY}" == "1" ]]; then
    log "重新加载种子数据..."
    mysql_hfb --default-character-set=utf8mb4 hfb_sys < "${ROOT_DIR}/backend/migrations/000002_seed.sql"
    log_success "种子数据加载完成"
  else
    log "数据库已存在，跳过迁移（使用 --reset-db 重建）"
  fi
}

load_env_file() {
  local env_file="$1"
  local line

  while IFS= read -r line || [[ -n "${line}" ]]; do
    [[ -z "${line}" || "${line}" =~ ^[[:space:]]*# ]] && continue
    line="${line#export }"
    export "${line}"
  done < "${env_file}"
}

start_backend() {
  if [[ ! -f "${BACKEND_ENV}" ]]; then
    log "创建 backend/.env"
    cp "${BACKEND_ENV_EXAMPLE}" "${BACKEND_ENV}"
  fi

  log "启动后端：http://localhost:8080"
  (
    cd "${ROOT_DIR}/backend"
    load_env_file "${BACKEND_ENV}"
    go run ./cmd/api
  ) &
  BACKEND_PID="$!"
}

start_frontend() {
  if [[ ! -d "${ROOT_DIR}/frontend/node_modules" ]]; then
    log "安装前端依赖..."
    (
      cd "${ROOT_DIR}/frontend"
      npm ci
    )
  fi

  log "启动前端：http://localhost:5173"
  (
    cd "${ROOT_DIR}/frontend"
    npm run dev
  ) &
  FRONTEND_PID="$!"
}

watch_processes() {
  while true; do
    if [[ -n "${BACKEND_PID}" ]] && ! kill -0 "${BACKEND_PID}" >/dev/null 2>&1; then
      wait "${BACKEND_PID}" || true
      printf "后端进程已退出\n" >&2
      exit 1
    fi
    if [[ -n "${FRONTEND_PID}" ]] && ! kill -0 "${FRONTEND_PID}" >/dev/null 2>&1; then
      wait "${FRONTEND_PID}" || true
      printf "前端进程已退出\n" >&2
      exit 1
    fi
    sleep 2
  done
}

main() {
  need_cmd docker
  if [[ "${SEED_ONLY}" != "1" && "${NO_BACKEND}" == "0" ]]; then
    need_cmd go
  fi
  if [[ "${SEED_ONLY}" != "1" && "${NO_FRONTEND}" == "0" ]]; then
    need_cmd npm
  fi
  if [[ "${SEED_ONLY}" != "1" && ( "${NO_BACKEND}" == "0" || "${NO_FRONTEND}" == "0" ) ]]; then
    need_cmd curl
  fi

  trap cleanup EXIT
  trap 'cleanup; exit 130' INT TERM

  log "启动开发依赖：MySQL、Redis、MinIO"
  docker compose -f "${COMPOSE_FILE}" up -d

  wait_container_healthy hfb-mysql "MySQL"
  wait_container_healthy hfb-redis "Redis"
  wait_container_healthy hfb-minio "MinIO"

  init_database

  # 仅加载种子数据模式
  if [[ "${SEED_ONLY}" == "1" ]]; then
    log_success "种子数据加载完成，退出"
    exit 0
  fi

  if [[ "${NO_BACKEND}" == "0" ]]; then
    ensure_port_free "${BACKEND_PORT}" "后端"
    start_backend
    wait_http_ready "${BACKEND_HEALTH_URL}" "后端" "${BACKEND_PID}"
  fi

  if [[ "${NO_FRONTEND}" == "0" ]]; then
    ensure_port_free "${FRONTEND_PORT}" "前端"
    start_frontend
    wait_http_ready "${FRONTEND_HEALTH_URL}" "前端" "${FRONTEND_PID}"
  fi

  if [[ -z "${BACKEND_PID}" && -z "${FRONTEND_PID}" ]]; then
    log "仅启动 Docker 开发依赖，前后端未启动"
    return 0
  fi

  log_success "开发环境已启动"
  if [[ "${NO_FRONTEND}" == "0" ]]; then
    log "前台：http://localhost:5173"
    log "后台：http://localhost:5173/admin/login（admin / admin123456）"
  fi

  log "按 Ctrl+C 停止前后端；Docker 依赖会保留运行"

  watch_processes
}

main "$@"