#!/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"
MIGRATIONS_DIR="${ROOT_DIR}/backend/migrations"
MYSQL_DATABASE="${DEV_MYSQL_DATABASE:-hfb_sys}"
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     仅重新同步基础数据
  --no-migrate    不执行数据库迁移
  --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_MYSQL_DATABASE=hfb_sys
                  开发数据库名
  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     # 重新同步基础数据
EOF
  exit 0
}

# 参数解析
RESET_DB="${DEV_RESET_DB:-0}"
SEED_ONLY=0
NO_MIGRATE=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-migrate)
      NO_MIGRATE=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 "$@"
}

mysql_scalar() {
  mysql_hfb --default-character-set=utf8mb4 -N -s -e "$1" "${MYSQL_DATABASE}"
}

validate_database_name() {
  if [[ ! "${MYSQL_DATABASE}" =~ ^[A-Za-z0-9_]+$ ]]; then
    log_error "DEV_MYSQL_DATABASE 只能包含字母、数字和下划线，当前值：${MYSQL_DATABASE}"
    exit 1
  fi
}

reset_database() {
  if [[ "${RESET_DB}" != "1" ]]; then
    return 0
  fi

  log_warn "重置数据库 ${MYSQL_DATABASE}..."
  mysql_root -e \
    "DROP DATABASE IF EXISTS \`${MYSQL_DATABASE}\`; CREATE DATABASE \`${MYSQL_DATABASE}\` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
  log_success "数据库已重建"
}

ensure_migration_table() {
  mysql_hfb --default-character-set=utf8mb4 "${MYSQL_DATABASE}" <<'SQL'
CREATE TABLE IF NOT EXISTS schema_migrations (
  version VARCHAR(255) PRIMARY KEY,
  applied_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
SQL
}

bootstrap_existing_schema_history() {
  local migration_count users_exists
  migration_count="$(mysql_scalar "SELECT COUNT(*) FROM schema_migrations;")"
  users_exists="$(mysql_scalar "SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = DATABASE() AND table_name = 'users';")"

  if [[ "${migration_count}" == "0" && "${users_exists}" != "0" ]]; then
    log_warn "检测到已有表结构但没有迁移记录，补记 000001_init 并同步初始化脚本"
    mysql_hfb --default-character-set=utf8mb4 -e \
      "INSERT IGNORE INTO schema_migrations (version) VALUES ('000001_init');" "${MYSQL_DATABASE}"
  fi
}

run_migrations() {
  if [[ "${NO_MIGRATE}" == "1" ]]; then
    log_warn "已跳过数据库迁移"
    return 0
  fi

  log "自动发现并执行数据库迁移..."
  ensure_migration_table
  bootstrap_existing_schema_history

  local file version applied
  local found=0
  shopt -s nullglob
  for file in "${MIGRATIONS_DIR}"/*.sql; do
    found=1
    version="$(basename "${file}" .sql)"
    applied="$(mysql_scalar "SELECT COUNT(*) FROM schema_migrations WHERE version = '${version}';")"
    if [[ "${applied}" != "0" ]]; then
      if [[ "${version}" == "000001_init" ]]; then
        log "同步初始化脚本：${version}"
        mysql_hfb --default-character-set=utf8mb4 "${MYSQL_DATABASE}" < "${file}"
      else
        log "跳过已应用迁移：${version}"
      fi
      continue
    fi

    log "执行迁移：${version}"
    mysql_hfb --default-character-set=utf8mb4 "${MYSQL_DATABASE}" < "${file}"
    mysql_hfb --default-character-set=utf8mb4 -e \
      "INSERT INTO schema_migrations (version) VALUES ('${version}');" "${MYSQL_DATABASE}"
  done
  shopt -u nullglob

  if [[ "${found}" == "0" ]]; then
    log_warn "未发现迁移文件：${MIGRATIONS_DIR}/*.sql"
  else
    log_success "数据库迁移完成"
  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

  validate_database_name
  if [[ "${RESET_DB}" == "1" && "${NO_MIGRATE}" == "1" ]]; then
    log_error "--reset-db 会清空数据库，不能和 --no-migrate 同时使用"
    exit 1
  fi

  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"

  reset_database
  run_migrations

  # 仅同步基础数据模式
  if [[ "${SEED_ONLY}" == "1" ]]; then
    log_success "基础数据同步完成，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 "$@"
