#!/usr/bin/env bash
# =============================================================================
#  logs.sh — 查看服务日志
#
#  用法:
#    ./logs.sh <service>          # tail -f 实时跟踪日志
#    ./logs.sh <service> --last   # 只显示最后 100 行（不跟踪）
#    ./logs.sh <service> -n 50    # 显示最后 50 行并跟踪
#    ./logs.sh scripts            # 列出所有脚本执行日志
#    ./logs.sh scripts --last     # 查看最新一次脚本日志
#
#  日志目录一览：
#    .local-dev/logs/             — 后端服务运行日志
#    .local-dev/docker-logs/      — Docker 容器日志（每日一文件）
#    .local-dev/script-logs/      — 脚本执行日志（带时间戳）
#
#  后端服务: openim-server, chat-rpc, admin-rpc, chat-api, admin-api,
#            meetingmsg, livecloud, livestream, build-server
#  前端服务: pc, meetingh5, h5, cms, build-cms, build-down
#  Docker:   redis, kafka, etcd, livekit
# =============================================================================
set -euo pipefail
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)/common.sh"
# 注意：logs.sh 不调用 init_script_log，避免 tail -f 被重定向到日志文件

SVC="${1:-}"
OPT="${2:-}"
NLINES="${3:-100}"

# ── 无参数：打印概览 ──────────────────────────────────────────────────────────
if [[ -z "$SVC" ]]; then
  echo ""
  echo -e "${BOLD}用法:${NC} $0 <service|scripts> [--last|-n <lines>]"
  echo ""

  echo -e "${BOLD}后端服务日志${NC}  ($LOG_DIR/):"
  for svc in "${ALL_SVCS[@]}"; do
    local_log="$LOG_DIR/$svc.log"
    if [[ -f "$local_log" ]]; then
      size=$(du -sh "$local_log" 2>/dev/null | awk '{print $1}')
      printf "  %-18s %s (%s)\n" "$svc" "$local_log" "$size"
    else
      printf "  %-18s (无日志)\n" "$svc"
    fi
  done

  echo ""
  echo -e "${BOLD}Docker 容器日志${NC}  ($DOCKER_LOG_DIR/):"
  for svc in redis kafka etcd livekit; do
    log_dir="$DOCKER_LOG_DIR/$svc"
    if [[ -d "$log_dir" ]]; then
      latest=$(ls -t "$log_dir"/*.log 2>/dev/null | head -1 || echo "")
      if [[ -n "$latest" ]]; then
        size=$(du -sh "$latest" 2>/dev/null | awk '{print $1}')
        printf "  %-10s %s (%s)\n" "$svc" "$latest" "$size"
      else
        printf "  %-10s (目录存在，暂无日志文件)\n" "$svc"
      fi
    else
      printf "  %-10s (未启动)\n" "$svc"
    fi
  done

  echo ""
  echo -e "${BOLD}前端服务日志${NC}  ($LOG_DIR/fe-*.log):"
  FE_LIST=(pc meetingh5 h5 cms build-cms build-down)
  for fe in "${FE_LIST[@]}"; do
    fe_log="$LOG_DIR/fe-${fe}.log"
    if [[ -f "$fe_log" ]]; then
      size=$(du -sh "$fe_log" 2>/dev/null | awk '{print $1}')
      printf "  %-14s %s (%s)\n" "$fe" "$fe_log" "$size"
    else
      printf "  %-14s (无日志)\n" "$fe"
    fi
  done

  echo ""
  echo -e "${BOLD}脚本执行日志${NC}  ($SCRIPT_LOG_DIR/):"
  if [[ -d "$SCRIPT_LOG_DIR" ]]; then
    ls -t "$SCRIPT_LOG_DIR"/*.log 2>/dev/null | head -5 | while read -r f; do
      size=$(du -sh "$f" 2>/dev/null | awk '{print $1}')
      printf "  %s (%s)\n" "$(basename "$f")" "$size"
    done
    count=$(ls "$SCRIPT_LOG_DIR"/*.log 2>/dev/null | wc -l | tr -d ' ')
    [[ "$count" -gt 5 ]] && echo "  ... 共 $count 个文件"
  else
    echo "  (尚无脚本日志)"
  fi
  echo ""
  exit 0
fi

# ── 脚本执行日志 ──────────────────────────────────────────────────────────────
if [[ "$SVC" == "scripts" ]]; then
  if [[ ! -d "$SCRIPT_LOG_DIR" ]] || [[ -z "$(ls "$SCRIPT_LOG_DIR"/*.log 2>/dev/null)" ]]; then
    warn "暂无脚本执行日志 ($SCRIPT_LOG_DIR/)"
    exit 0
  fi

  if [[ "$OPT" == "--last" ]]; then
    latest=$(ls -t "$SCRIPT_LOG_DIR"/*.log | head -1)
    info "最新脚本日志: $latest"
    echo "──────────────────────────────────────"
    cat "$latest"
  else
    info "所有脚本执行日志 ($SCRIPT_LOG_DIR/):"
    ls -lht "$SCRIPT_LOG_DIR"/*.log 2>/dev/null | awk '{printf "  %-8s %s %s\n", $5, $6" "$7" "$8, $9}'
    echo ""
    echo "查看最新: $0 scripts --last"
    echo "查看指定: cat $SCRIPT_LOG_DIR/<filename>"
  fi
  exit 0
fi

# ── Docker 容器日志 ───────────────────────────────────────────────────────────
_docker_log() {
  local cname="$1"
  local log_dir="$DOCKER_LOG_DIR/${cname#dev-}"
  local latest_file

  info "$cname 容器日志"

  # 展示日志文件路径
  if [[ -d "$log_dir" ]]; then
    latest_file=$(ls -t "$log_dir"/*.log 2>/dev/null | head -1 || echo "")
    if [[ -n "$latest_file" ]]; then
      info "本地日志文件: $latest_file"
    fi
  fi

  echo "──────────────────────────────────────"

  if [[ "$OPT" == "--last" ]]; then
    docker logs --tail "$NLINES" "$cname" 2>&1
  else
    docker logs -f --tail "${NLINES}" "$cname" 2>&1
  fi
}

case "$SVC" in
  redis)   _docker_log "dev-redis";   exit 0 ;;
  kafka)   _docker_log "dev-kafka";   exit 0 ;;
  etcd)    _docker_log "dev-etcd";    exit 0 ;;
  livekit) _docker_log "dev-livekit"; exit 0 ;;
esac

# ── 前端服务日志 ──────────────────────────────────────────────────────────────
FE_LIST=(pc meetingh5 h5 cms build-cms build-down)
for _fe in "${FE_LIST[@]}"; do
  if [[ "$SVC" == "$_fe" ]]; then
    LOGFILE="$LOG_DIR/fe-${SVC}.log"
    pidfile="$PID_DIR/fe-${SVC}.pid"
    if [[ ! -f "$LOGFILE" ]]; then
      error "日志文件不存在: $LOGFILE"
      echo "  $SVC 可能尚未启动。启动命令: ./deploy-test/07-start-frontend.sh $SVC"
      exit 1
    fi
    if [[ -f "$pidfile" ]] && kill -0 "$(cat "$pidfile")" 2>/dev/null; then
      info "$SVC 正在运行 (PID=$(cat "$pidfile"))"
    else
      warn "$SVC 当前未运行（显示历史日志）"
    fi
    info "日志文件: $LOGFILE"
    size=$(du -sh "$LOGFILE" 2>/dev/null | awk '{print $1}')
    info "文件大小: $size"
    echo "──────────────────────────────────────"
    if [[ "$OPT" == "--last" ]]; then
      tail -n "${NLINES}" "$LOGFILE"
    elif [[ "$OPT" == "-n" ]]; then
      tail -f -n "${NLINES}" "$LOGFILE"
    else
      tail -f -n 100 "$LOGFILE"
    fi
    exit 0
  fi
done

# ── 后端服务日志 ──────────────────────────────────────────────────────────────
LOGFILE="$LOG_DIR/$SVC.log"

if [[ ! -f "$LOGFILE" ]]; then
  error "日志文件不存在: $LOGFILE"
  echo "  服务 $SVC 可能尚未启动。启动命令: ./deploy-test/05-start.sh $SVC"
  exit 1
fi

PIDFILE="$PID_DIR/$SVC.pid"
if [[ -f "$PIDFILE" ]] && kill -0 "$(cat "$PIDFILE")" 2>/dev/null; then
  info "$SVC 正在运行 (PID=$(cat "$PIDFILE"))"
else
  warn "$SVC 当前未运行（显示历史日志）"
fi

info "日志文件: $LOGFILE"
size=$(du -sh "$LOGFILE" 2>/dev/null | awk '{print $1}')
info "文件大小: $size"
echo "──────────────────────────────────────"

if [[ "$OPT" == "--last" ]]; then
  tail -n "${NLINES}" "$LOGFILE"
elif [[ "$OPT" == "-n" ]]; then
  tail -f -n "${NLINES}" "$LOGFILE"
else
  tail -f -n 100 "$LOGFILE"
fi