// svxdr — live-data daemon for SvxPortal (nodelist + proxy + astmeta + xlink)
// Copyright (C) 2026 SA7AUX (Björn)
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// This program is free software: you can redistribute it and/or modify it under
// the terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option) any
// later version. See the LICENSE file for details.

package nodelist

// nodes.json — shared bridge map (see svx-web/nodes.README.md). nodelist takes
// the friendly reflector names (System) and the Location format strings from it,
// so the Location column ("{system} via {node} / {talker}") is driven by the
// same one file that configures astmeta and Asterisk. Merged ON TOP of the
// existing lastheard.json, so a box with only lastheard.json is unchanged.

import (
	"encoding/json"
	"os"
	"strconv"
	"strings"
)

type nodesFileNL struct {
	Lastheard struct {
		BridgeLocationFormat         string `json:"bridge_location_format"`
		BridgeLocationFormatNoSystem string `json:"bridge_location_format_no_system"`
	} `json:"lastheard"`
	Nodes []struct {
		Allstar  int    `json:"allstar"`
		System   string `json:"system"`
		Via      string `json:"via"`
		Callsign string `json:"callsign"`
		Enabled  *bool  `json:"enabled"`
	} `json:"nodes"`
}

// applyNodesRenderConfig merges nodes.json's reflector names + Location formats
// over cfg. A missing/invalid file is a no-op (cfg keeps the lastheard.json /
// default values). ReflectorNames is keyed the way bridgeIdentity looks it up:
// by the bridge label (via/callsign) and, as a fallback, the far AllStar node.
func applyNodesRenderConfig(cfg *lastheardRenderCfg, path string) {
	b, err := os.ReadFile(path)
	if err != nil {
		return
	}
	var nf nodesFileNL
	if json.Unmarshal(b, &nf) != nil {
		return
	}
	if s := strings.TrimSpace(nf.Lastheard.BridgeLocationFormat); s != "" {
		cfg.BridgeLocationFormat = s
	}
	if s := strings.TrimSpace(nf.Lastheard.BridgeLocationFormatNoSystem); s != "" {
		cfg.BridgeLocationFormatNoSystem = s
	}
	if cfg.ReflectorNames == nil {
		cfg.ReflectorNames = map[string]string{}
	}
	for _, e := range nf.Nodes {
		if (e.Enabled != nil && !*e.Enabled) || e.System == "" {
			continue
		}
		if e.Via != "" {
			cfg.ReflectorNames[e.Via] = e.System
		}
		if e.Callsign != "" {
			cfg.ReflectorNames[e.Callsign] = e.System
		}
		if e.Allstar != 0 {
			cfg.ReflectorNames[strconv.Itoa(e.Allstar)] = e.System
		}
	}
}

// nodesJSONPath returns the nodes.json path (NODES_JSON env, default /etc/nodes.json).
func nodesJSONPath() string {
	if p := os.Getenv("NODES_JSON"); p != "" {
		return p
	}
	return "/etc/nodes.json"
}