import type { StyleConfig, DefaultLayerStyleId } from "@components/olmap/core/Controls/styleEditorTypes";

export type ApplyLayerStyleActionPayload = {
  layerId: DefaultLayerStyleId;
  resetToDefault: boolean;
  styleConfig?: Partial<StyleConfig>;
};

export const APPLY_LAYER_STYLE_TOOL = "apply_layer_style";

const LAYER_LABELS: Record<DefaultLayerStyleId, string> = {
  junctions: "节点",
  pipes: "管道",
};

const asString = (value: unknown): string | undefined =>
  typeof value === "string" && value.trim() ? value.trim() : undefined;

const asNumber = (value: unknown): number | undefined =>
  typeof value === "number" && Number.isFinite(value)
    ? value
    : typeof value === "string" && value.trim() && Number.isFinite(Number(value))
      ? Number(value)
      : undefined;

const asBoolean = (value: unknown): boolean | undefined =>
  typeof value === "boolean"
    ? value
    : typeof value === "string"
      ? value === "true"
        ? true
        : value === "false"
          ? false
          : undefined
      : undefined;

const asNumberArray = (value: unknown): number[] | undefined =>
  Array.isArray(value)
    ? value
        .map((item) => asNumber(item))
        .filter((item): item is number => item !== undefined)
    : undefined;

const asStringArray = (value: unknown): string[] | undefined =>
  Array.isArray(value)
    ? value
        .map((item) => asString(item))
        .filter((item): item is string => item !== undefined)
    : undefined;

export const normalizeStyleLayerId = (value: unknown): DefaultLayerStyleId | null => {
  const normalized = asString(value)?.toLowerCase();
  if (normalized === "junctions" || normalized === "pipes") {
    return normalized;
  }
  return null;
};

export const getStyleLayerLabel = (layerId: DefaultLayerStyleId): string =>
  LAYER_LABELS[layerId];

export const parseApplyLayerStylePayload = (
  params: Record<string, unknown>,
): ApplyLayerStyleActionPayload | null => {
  const layerId = normalizeStyleLayerId(params.layer_id ?? params.layerId);
  if (!layerId) {
    return null;
  }

  const resetToDefault = Boolean(
    asBoolean(params.reset_to_default ?? params.resetToDefault),
  );
  const rawStyleConfig =
    params.style_config && typeof params.style_config === "object"
      ? (params.style_config as Record<string, unknown>)
      : params.styleConfig && typeof params.styleConfig === "object"
        ? (params.styleConfig as Record<string, unknown>)
        : null;

  const styleConfig: Partial<StyleConfig> | undefined = rawStyleConfig
    ? {
        property: asString(rawStyleConfig.property),
        classificationMethod: asString(
          rawStyleConfig.classification_method ?? rawStyleConfig.classificationMethod,
        ),
        segments: asNumber(rawStyleConfig.segments),
        minSize: asNumber(rawStyleConfig.min_size ?? rawStyleConfig.minSize),
        maxSize: asNumber(rawStyleConfig.max_size ?? rawStyleConfig.maxSize),
        minStrokeWidth: asNumber(
          rawStyleConfig.min_stroke_width ?? rawStyleConfig.minStrokeWidth,
        ),
        maxStrokeWidth: asNumber(
          rawStyleConfig.max_stroke_width ?? rawStyleConfig.maxStrokeWidth,
        ),
        fixedStrokeWidth: asNumber(
          rawStyleConfig.fixed_stroke_width ?? rawStyleConfig.fixedStrokeWidth,
        ),
        colorType: asString(rawStyleConfig.color_type ?? rawStyleConfig.colorType),
        singlePaletteIndex: asNumber(
          rawStyleConfig.single_palette_index ?? rawStyleConfig.singlePaletteIndex,
        ),
        gradientPaletteIndex: asNumber(
          rawStyleConfig.gradient_palette_index ?? rawStyleConfig.gradientPaletteIndex,
        ),
        rainbowPaletteIndex: asNumber(
          rawStyleConfig.rainbow_palette_index ?? rawStyleConfig.rainbowPaletteIndex,
        ),
        showLabels: asBoolean(rawStyleConfig.show_labels ?? rawStyleConfig.showLabels),
        showId: asBoolean(rawStyleConfig.show_id ?? rawStyleConfig.showId),
        opacity: asNumber(rawStyleConfig.opacity),
        adjustWidthByProperty: asBoolean(
          rawStyleConfig.adjust_width_by_property ??
            rawStyleConfig.adjustWidthByProperty,
        ),
        customBreaks: asNumberArray(
          rawStyleConfig.custom_breaks ?? rawStyleConfig.customBreaks,
        ),
        customColors: asStringArray(
          rawStyleConfig.custom_colors ?? rawStyleConfig.customColors,
        ),
      }
    : undefined;

  const hasStyleOverrides =
    styleConfig &&
    Object.values(styleConfig).some((value) =>
      Array.isArray(value) ? value.length > 0 : value !== undefined,
    );

  if (!resetToDefault && !hasStyleOverrides) {
    return null;
  }

  return {
    layerId,
    resetToDefault,
    styleConfig: hasStyleOverrides ? styleConfig : undefined,
  };
};

export const describeApplyLayerStyle = (
  payload: ApplyLayerStyleActionPayload,
): string => {
  const layerLabel = getStyleLayerLabel(payload.layerId);
  if (payload.resetToDefault) {
    return `${layerLabel} · 重置默认样式`;
  }
  const property = payload.styleConfig?.property;
  return property ? `${layerLabel} · ${property}` : `${layerLabel} · 应用样式`;
};