/**
 * Farm Dashboard Service
 * Handles API calls for dashboard config and card data.
 * - Config: disabled cards, row order, drag reorder
 * - Cards: all 15 card payloads from /api/farm-dashboard/
 */

import { apiClient } from "../client";
import {
  CARD_IDS,
  CARD_TO_ROW,
  ROW_CARDS,
  ROW_IDS,
  type FarmDashboardConfig,
  type CardId,
  type RowId,
} from "@/views/dashboards/farm/farmDashboardConfig";

export interface ApiResponse<T> {
  code: number;
  msg: string;
  data: T;
}

export interface FarmDashboardConfigResponse {
  farm_uuid?: string;
  disabled_card_ids: string[];
  row_order: string[];
  enable_drag_reorder?: boolean;
}

/** API response shape for /api/farm-dashboard/ - each key matches CardId */
export interface FarmDashboardCardsResponse {
  farmOverviewKpis?: Record<string, unknown>;
  farmWeatherCard?: Record<string, unknown>;
  farmAlertsTracker?: Record<string, unknown>;
  sensorValuesList?: Record<string, unknown>;
  sensorRadarChart?: Record<string, unknown>;
  sensorComparisonChart?: Record<string, unknown>;
  anomalyDetectionCard?: Record<string, unknown>;
  farmAlertsTimeline?: Record<string, unknown>;
  waterNeedPrediction?: Record<string, unknown>;
  harvestPredictionCard?: Record<string, unknown>;
  yieldPredictionChart?: Record<string, unknown>;
  soilMoistureHeatmap?: Record<string, unknown>;
  ndviHealthCard?: Record<string, unknown>;
  recommendationsList?: Record<string, unknown>;
  economicOverview?: Record<string, unknown>;
}

interface FarmDashboardCardsTaskResult {
  farm_uuid?: string;
  all_cards?: FarmDashboardCardsResponse;
}

interface FarmDashboardCardsTaskData {
  task_id?: string;
  status?: string;
  result?: FarmDashboardCardsTaskResult;
}

const STORAGE_KEY_PREFIX = "farm_dashboard_config";

function getStorageKey(farmUuid: string): string {
  return `${STORAGE_KEY_PREFIX}:${farmUuid}`;
}

function isCardId(value: string): value is CardId {
  return (CARD_IDS as readonly string[]).includes(value);
}

function isRowId(value: string): value is RowId {
  return (ROW_IDS as readonly string[]).includes(value);
}

function normalizeDisabledCardIds(disabledIds: string[] = []): string[] {
  return Array.from(
    new Set(
      disabledIds.flatMap((id) => {
        if (isCardId(id)) return [id];
        if (isRowId(id)) return ROW_CARDS[id];
        return [];
      }),
    ),
  );
}

function normalizeRowOrder(rowOrder: string[] = []): string[] {
  const normalized = rowOrder
    .map((id) => {
      if (isRowId(id)) return id;
      if (isCardId(id)) return CARD_TO_ROW[id];
      return null;
    })
    .filter((id): id is RowId => !!id);

  const deduped = Array.from(new Set(normalized));

  return deduped.length
    ? [...deduped, ...ROW_IDS.filter((id) => !deduped.includes(id))]
    : [...ROW_IDS];
}

function extractCardsPayload(
  response:
    | ApiResponse<FarmDashboardCardsResponse>
    | ApiResponse<FarmDashboardCardsTaskData>
    | FarmDashboardCardsResponse
    | FarmDashboardCardsTaskData,
): Partial<Record<CardId, Record<string, unknown>>> {
  const raw = response && "data" in response ? response.data : response;

  if (!raw || typeof raw !== "object") {
    return {};
  }

  if ("result" in raw && raw.result && typeof raw.result === "object") {
    return (raw.result.all_cards ?? {}) as Partial<
      Record<CardId, Record<string, unknown>>
    >;
  }

  return raw as Partial<Record<CardId, Record<string, unknown>>>;
}

/**
 * Transform API response to frontend config format
 */
function fromApiResponse(
  data: FarmDashboardConfigResponse,
): FarmDashboardConfig {
  return {
    disabledCardIds: normalizeDisabledCardIds(data.disabled_card_ids),
    rowOrder: normalizeRowOrder(data.row_order),
    enableDragReorder: data.enable_drag_reorder ?? true,
  };
}

/**
 * Transform frontend config to API request format
 */
function toApiRequest(
  config: Partial<FarmDashboardConfig>,
): Partial<FarmDashboardConfigResponse> {
  const req: Partial<FarmDashboardConfigResponse> = {};
  if (config.disabledCardIds !== undefined)
    req.disabled_card_ids = config.disabledCardIds;
  if (config.rowOrder !== undefined) req.row_order = config.rowOrder;
  if (config.enableDragReorder !== undefined)
    req.enable_drag_reorder = config.enableDragReorder;
  return req;
}

/**
 * localStorage fallback when backend is not ready
 */
function getLocalConfig(farmUuid: string): FarmDashboardConfig | null {
  if (typeof window === "undefined") return null;
  try {
    const stored = localStorage.getItem(getStorageKey(farmUuid));
    return stored ? (JSON.parse(stored) as FarmDashboardConfig) : null;
  } catch {
    return null;
  }
}

function setLocalConfig(farmUuid: string, config: FarmDashboardConfig): void {
  if (typeof window === "undefined") return;
  try {
    localStorage.setItem(getStorageKey(farmUuid), JSON.stringify(config));
  } catch (e) {
    console.error("Failed to save farm dashboard config to localStorage", e);
  }
}

function buildFarmQuery(farmUuid: string): string {
  return `farm_uuid=${encodeURIComponent(farmUuid)}`;
}

export const farmDashboardService = {
  /**
   * Get farm dashboard config for the selected farm
   */
  async getConfig(farmUuid: string): Promise<FarmDashboardConfig> {
    try {
      const response = await apiClient.get<
        ApiResponse<FarmDashboardConfigResponse> | FarmDashboardConfigResponse
      >(`/api/farm-dashboard-config/?${buildFarmQuery(farmUuid)}`);
      const raw = response && "data" in response ? response.data : response;
      if (
        raw &&
        typeof raw === "object" &&
        ("disabled_card_ids" in raw || "row_order" in raw)
      ) {
        return fromApiResponse(raw as FarmDashboardConfigResponse);
      }
      throw new Error("Invalid response");
    } catch {
      const local = getLocalConfig(farmUuid);
      if (local) return local;
      return { disabledCardIds: [], rowOrder: [], enableDragReorder: true };
    }
  },

  /**
   * Update farm dashboard config
   */
  async updateConfig(
    farmUuid: string,
    data: Partial<FarmDashboardConfig>,
  ): Promise<FarmDashboardConfig> {
    try {
      const response = await apiClient.patch<
        ApiResponse<FarmDashboardConfigResponse> | FarmDashboardConfigResponse
      >("/api/farm-dashboard-config/", {
        farm_uuid: farmUuid,
        ...toApiRequest(data),
      });
      const raw = response && "data" in response ? response.data : response;
      if (
        raw &&
        typeof raw === "object" &&
        ("disabled_card_ids" in raw || "row_order" in raw)
      ) {
        const config = fromApiResponse(raw as FarmDashboardConfigResponse);
        setLocalConfig(farmUuid, config);
        return config;
      }
      throw new Error("Update failed");
    } catch (err) {
      const local = getLocalConfig(farmUuid);
      if (local) {
        const merged: FarmDashboardConfig = {
          disabledCardIds: data.disabledCardIds ?? local.disabledCardIds,
          rowOrder: data.rowOrder ?? local.rowOrder,
          enableDragReorder:
            data.enableDragReorder ?? local.enableDragReorder ?? true,
        };
        setLocalConfig(farmUuid, merged);
        return merged;
      }
      throw err;
    }
  },

  /**
   * Get all dashboard card data from API
   * Response: { code: 200, msg: "OK", data: { farmOverviewKpis, farmWeatherCard, ... } }
   */
  async getAllCards(
    farmUuid: string,
  ): Promise<
    Partial<Record<CardId, Record<string, unknown>>>
  > {
    try {
      const response = await apiClient.get<
        | ApiResponse<FarmDashboardCardsResponse>
        | ApiResponse<FarmDashboardCardsTaskData>
        | FarmDashboardCardsResponse
        | FarmDashboardCardsTaskData
      >(`/api/farm-dashboard/?${buildFarmQuery(farmUuid)}`);
      return extractCardsPayload(response);
    } catch {
      return {};
    }
  },
};