#!/usr/bin/env bash
# 生成 sing-box：代理流量全部 bind 数据网卡出口
set -euo pipefail
ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
# shellcheck source=lib.sh
source "$ROOT_DIR/scripts/lib.sh"
load_config

OUT_DIR="${1:-$ROOT_DIR/generated}"
mkdir -p "$OUT_DIR"

cell="$(resolve_cellular 2>/dev/null || true)"
if [[ -z "$cell" ]]; then
  resolve_cellular >/dev/null || true
fi

# 始终以当前网卡实 IP 为准：WWAN 重拨后 iface 名常不变，但 CELLULAR_SOURCE_IP 会过期。
# 过期的 inet4_bind_address 会导致 sing-box 出站失败 → 客户端 SOCKS rep=0x01。
live_src=""
if [[ -n "$cell" ]]; then
  live_src="$(detect_source_ip "$cell" || true)"
fi
src_ip="${live_src:-${CELLULAR_SOURCE_IP:-}}"
if [[ -n "$cell" && -n "$live_src" && "${CELLULAR_SOURCE_IP:-}" != "$live_src" ]]; then
  info "源 IP 已漂移: ${CELLULAR_SOURCE_IP:-<空>} → $live_src，写回 settings"
  persist_cellular_to_settings "${CONFIG_FILE:-$ROOT_DIR/etc/settings.conf}" "$cell" "$live_src" || true
  # 兼容 live 安装布局：settings 在 etc/
  if [[ -f /opt/cellular-proxy/etc/settings.conf ]]; then
    persist_cellular_to_settings /opt/cellular-proxy/etc/settings.conf "$cell" "$live_src" || true
  fi
  CELLULAR_SOURCE_IP="$live_src"
fi

if [[ -z "$cell" ]]; then
  warn "CELLULAR_IFACE 为空，临时用 lo 生成配置（启动前务必修正）"
  cell_for_cfg=lo
else
  cell_for_cfg="$cell"
fi

if [[ "$PANEL_SECRET" == "please-change-me" || "$PANEL_SECRET" == "change-this-secret" ]]; then
  warn "PANEL_SECRET 仍是默认值，请修改 settings.conf"
fi
if [[ "$PROXY_LISTEN_HOST" != "127.0.0.1" && "$PROXY_LISTEN_HOST" != "::1" && -z "$PROXY_USER" ]]; then
  warn "代理监听 $PROXY_LISTEN_HOST 且未设置 PROXY_USER/PASS（局域网建议加鉴权）"
fi

export GEN_OUT="$OUT_DIR/config.json"
export GEN_CELL="$cell_for_cfg"
export GEN_SRC="$src_ip"
export GEN_PROXY_HOST="$PROXY_LISTEN_HOST"
export GEN_PROXY_PORT="$PROXY_MIXED_PORT"
export GEN_PROXY_USER="$PROXY_USER"
export GEN_PROXY_PASS="$PROXY_PASS"
export GEN_PANEL_HOST="$PANEL_LISTEN_HOST"
export GEN_PANEL_PORT="$PANEL_PORT"
export GEN_PANEL_SECRET="$PANEL_SECRET"
export GEN_DNS="$ENABLE_DNS"
export GEN_LOG="$LOG_LEVEL"
export GEN_UI_DIR="$INSTALL_DIR/ui"

python3 <<'PY'
import json, os
from pathlib import Path

cell = os.environ["GEN_CELL"]
src = os.environ.get("GEN_SRC") or ""
log_level = os.environ.get("GEN_LOG") or "warn"
ui_dir = os.environ.get("GEN_UI_DIR") or "/opt/cellular-proxy/ui"

users = []
u = os.environ.get("GEN_PROXY_USER") or ""
p = os.environ.get("GEN_PROXY_PASS") or ""
if u:
    users.append({"username": u, "password": p})

inbound = {
    "type": "mixed",
    "tag": "mixed-in",
    "listen": os.environ["GEN_PROXY_HOST"],
    "listen_port": int(os.environ["GEN_PROXY_PORT"]),
}
if users:
    inbound["users"] = users

# 唯一业务出口：强制绑定数据网卡
out_cell = {
    "type": "direct",
    "tag": "cellular",
    "bind_interface": cell,
}
if src:
    out_cell["inet4_bind_address"] = src

cfg = {
    "log": {"level": log_level, "timestamp": True},
    "inbounds": [inbound],
    "outbounds": [
        out_cell,
        {"type": "block", "tag": "block"},
    ],
    # 所有代理流量最终都走 cellular（数据）
    "route": {
        "rules": [],
        "final": "cellular",
        "auto_detect_interface": False,
    },
    "experimental": {
        "clash_api": {
            "external_controller": f"{os.environ['GEN_PANEL_HOST']}:{os.environ['GEN_PANEL_PORT']}",
            "secret": os.environ["GEN_PANEL_SECRET"],
            "default_mode": "rule",
            "external_ui": ui_dir,
        },
        "cache_file": {
            "enabled": True,
            "path": "/var/lib/cellular-proxy/cache.db",
            "store_fakeip": False,
        },
    },
}

if (os.environ.get("GEN_DNS") or "true").lower() == "true":
    # DNS 也走数据出口，避免解析从 WiFi 出去
    cfg["dns"] = {
        "servers": [
            {
                "tag": "remote",
                "address": "1.1.1.1",
                "detour": "cellular",
            },
        ],
        "final": "remote",
        "strategy": "ipv4_only",
    }

Path(os.environ["GEN_OUT"]).write_text(
    json.dumps(cfg, indent=2, ensure_ascii=False) + "\n", encoding="utf-8"
)
print("wrote", os.environ["GEN_OUT"])
PY

cat > "$OUT_DIR/runtime.env" <<EOF
INSTALL_DIR=${INSTALL_DIR}
LOG_DIR=${LOG_DIR}
CELLULAR_IFACE=${cell}
CELLULAR_SOURCE_IP=${src_ip}
PROXY_LISTEN_HOST=${PROXY_LISTEN_HOST}
PROXY_MIXED_PORT=${PROXY_MIXED_PORT}
PANEL_LISTEN_HOST=${PANEL_LISTEN_HOST}
PANEL_PORT=${PANEL_PORT}
EGRESS_CHECK_URL=${EGRESS_CHECK_URL}
EXPECTED_CELLULAR_PUBLIC_IP=${EXPECTED_CELLULAR_PUBLIC_IP}
MEMORY_MAX_MB=${MEMORY_MAX_MB}
REQUIRE_CELLULAR_IFACE=${REQUIRE_CELLULAR_IFACE}
EOF

cat > "$OUT_DIR/SUMMARY.txt" <<EOF
generated_at=$(date -Iseconds)
语义=走代理的连接一律从数据网卡出口
cellular_iface=${cell}
cellular_source_ip=${src_ip}
proxy=${PROXY_LISTEN_HOST}:${PROXY_MIXED_PORT} (HTTP+SOCKS mixed)
panel=http://<LAN-IP>:${PANEL_PORT}/  secret=见 settings PANEL_SECRET
memory_max_mb=${MEMORY_MAX_MB}
EOF

info "生成完成: $OUT_DIR"
cat "$OUT_DIR/SUMMARY.txt"