import type { MapGeoJSONFeature } from "maplibre-gl";
import type { DetailFeature } from "../types";
import { formatValue } from "../utils/format-value";
import { SOURCE_LAYERS, type WaterNetworkSourceId } from "./sources";

const UUID_PATTERN = /^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;

export function getFeatureId(feature: MapGeoJSONFeature) {
  const layer = getWaterNetworkSourceId(feature);
  const raw = layer === "scada"
    ? feature.properties?.scada_id ?? (typeof feature.id === "string" && UUID_PATTERN.test(feature.id) ? feature.id : undefined)
    : feature.id ?? feature.properties?.id;

  return raw === undefined || raw === null ? "" : String(raw);
}

export function getWaterNetworkSourceId(feature: MapGeoJSONFeature): WaterNetworkSourceId | null {
  const entry = Object.entries(SOURCE_LAYERS).find(([, sourceLayer]) => sourceLayer === feature.sourceLayer);
  return (entry?.[0] as WaterNetworkSourceId | undefined) ?? null;
}

export function toDetailFeature(feature: MapGeoJSONFeature): DetailFeature {
  const layer = getWaterNetworkSourceId(feature);
  if (!layer) {
    throw new Error(`Unsupported water network source layer: ${feature.sourceLayer ?? "unknown"}`);
  }

  const id = getFeatureId(feature);
  const properties = feature.properties ?? {};
  const presentation = getFeaturePresentation(layer, id, properties);

  return {
    id,
    layer,
    ...presentation,
    properties
  };
}

function getFeaturePresentation(
  layer: WaterNetworkSourceId,
  id: string,
  properties: Record<string, unknown>
) {
  const displayId = id || "未命名";

  switch (layer) {
    case "conduits":
      return {
        title: `管渠 ${displayId}`,
        subtitle: `DN${formatValue(properties.diameter)} · ${formatValue(properties.length)} m`
      };
    case "junctions":
      return {
        title: `检查井 ${displayId}`,
        subtitle: `最大深度 ${formatValue(properties.max_depth)} m · 井底高程 ${formatValue(properties.invert_elevation)} m`
      };
    case "orifices":
      return {
        title: `孔口 ${displayId}`,
        subtitle: `类型 ${formatValue(properties.orifice_type)} · 断面 ${formatValue(properties.shape)}`
      };
    case "pumps":
      return {
        title: `泵 ${displayId}`,
        subtitle: `状态 ${formatValue(properties.status)} · 曲线 ${formatValue(properties.pump_curve)}`
      };
    case "outfalls":
      return {
        title: `排放口 ${displayId}`,
        subtitle: `类型 ${formatValue(properties.outfall_type)} · 井底高程 ${formatValue(properties.invert_elevation)} m`
      };
    case "scada":
      return {
        title: String(properties.name || `SCADA 测点 ${displayId}`),
        subtitle: `${formatValue(properties.kind)} · 设备 ${formatValue(properties.external_id)}`
      };
  }
}