import cloneDeep from 'lodash-es/cloneDeep';
import get from 'lodash-es/get';
import isEqual from 'lodash-es/isEqual';
import set from 'lodash-es/set';
import unset from 'lodash-es/unset';
import { RawFrigateCardConfig, RawFrigateCardConfigArray } from './config/types';
import {
  CONF_CAMERAS,
  CONF_CAMERAS_GLOBAL_IMAGE,
  CONF_CAMERAS_GLOBAL_JSMPEG,
  CONF_CAMERAS_GLOBAL_WEBRTC_CARD,
  CONF_ELEMENTS,
  CONF_MEDIA_GALLERY,
  CONF_MENU_BUTTONS_CAMERA_UI,
  CONF_OVERRIDES,
  CONF_VIEW_SCAN_ACTIONS_UNTRIGGER,
} from './const';
import { arrayify } from './utils/basic';

// *************************************************************************
//                  General Config Management Functions
// *************************************************************************

/**
 * Set a configuration value.
 * @param obj The configuration.
 * @param keys The key to the property to set.
 * @param value The value to set.
 */

export const setConfigValue = (
  obj: RawFrigateCardConfig,
  keys: string | (string | number)[],
  value: unknown,
): void => {
  set(obj, keys, value);
};

/**
 * Get a configuration value.
 * @param obj The configuration.
 * @param keys The key to the property to retrieve.
 * @param def Default if key not found.
 * @returns The property or undefined if not found.
 */
export const getConfigValue = (
  obj: RawFrigateCardConfig,
  keys: string | (string | number)[],
  def?: unknown,
): unknown => {
  return get(obj, keys, def);
};

/**
 * Delete a configuration value.
 * @param obj The configuration.
 * @param key The key to the property to delete.
 */
export const deleteConfigValue = (obj: RawFrigateCardConfig, path: string): void => {
  unset(obj, path);
};

/**
 * Copy a configuration.
 * @param obj Configuration to copy.
 * @returns A new deeply-copied configuration.
 */
export const copyConfig = <T>(obj: T): T => {
  return cloneDeep(obj);
};

/**
 * Given an array path, return a true path.
 * @param path The array path (should have a '#').
 * @param index The numeric array index to use.
 * @returns The true config path.
 */
export const getArrayConfigPath = (path: string, index: number): string => {
  return path.replace('#', `[${index.toString()}]`);
};

// *************************************************************************
//                  Upgrade Related Functions
// *************************************************************************

/**
 * Upgrade a configuration.
 * @param obj The configuration to upgrade.
 * @returns `true` if the configuration is modified.
 */
export const upgradeConfig = function (obj: RawFrigateCardConfig): boolean {
  let upgraded = false;
  for (let i = 0; i < UPGRADES.length; i++) {
    upgraded = UPGRADES[i](obj) || upgraded;
  }
  return upgraded;
};

/**
 * Determine if a configuration is automatically upgradeable.
 * @param obj The configuration. It is not modified.
 * @returns `true` if the configuration is upgradeable.
 */
export const isConfigUpgradeable = function (obj: RawFrigateCardConfig): boolean {
  return upgradeConfig(copyConfig(obj));
};

/**
 * Move a property from one location to another.
 * @param obj The configuration object in which the property resides.
 * @param oldPath The old property path.
 * @param newPath The new property path.
 * @param transform An optional transform for the value.
 * @returns `true` if the configuration was modified.
 */
export const moveConfigValue = (
  obj: RawFrigateCardConfig,
  oldPath: string,
  newPath: string,
  options?: {
    transform?: (valueIn: unknown) => unknown;
    keepOriginal?: boolean;
  },
): boolean => {
  const inValue = getConfigValue(obj, oldPath);
  if (inValue === undefined) {
    return false;
  }
  const outValue = options?.transform ? options.transform(inValue) : inValue;
  if (oldPath === newPath && isEqual(inValue, outValue)) {
    return false;
  }
  if (outValue === null) {
    if (!options?.keepOriginal) {
      deleteConfigValue(obj, oldPath);
      return true;
    }
    return false;
  }
  if (outValue !== undefined) {
    if (!options?.keepOriginal) {
      deleteConfigValue(obj, oldPath);
    }
    setConfigValue(obj, newPath, outValue);
    return true;
  }
  return false;
};

/**
 * Upgrade by moving a property from one location to another.
 * @param oldPath The old property path.
 * @param newPath The new property path.
 * @param transform An optional transform for the value.
 * @returns `true` if the configuration was modified.
 */
export const upgradeMoveTo = function (
  oldPath: string,
  newPath: string,
  options?: {
    transform?: (valueIn: unknown) => unknown;
    keepOriginal?: boolean;
  },
): (obj: RawFrigateCardConfig) => boolean {
  return function (obj: RawFrigateCardConfig): boolean {
    return moveConfigValue(obj, oldPath, newPath, options);
  };
};

/**
 * Upgrade by moving a property from one location to another, and moving a
 * property specified in a top-level overrides object.
 * @param oldPath The old property path.
 * @param newPath The new property path.
 * @param transform An optional transform for the value.
 * @returns A function that returns `true` if the configuration was modified.
 */
export const upgradeMoveToWithOverrides = function (
  oldPath: string,
  newPath: string,
  options?: {
    transform?: (valueIn: unknown) => unknown;
    keepOriginal?: boolean;
  },
): (obj: RawFrigateCardConfig) => boolean {
  return function (obj: RawFrigateCardConfig): boolean {
    let modified = upgradeMoveTo(oldPath, newPath, options)(obj);
    modified =
      upgradeArrayOfObjects(
        CONF_OVERRIDES,
        upgradeMoveTo(oldPath, newPath, options),
        (obj) => obj.overrides as RawFrigateCardConfig | undefined,
      )(obj) || modified;
    return modified;
  };
};

/**
 * Upgrade a property in place with overrides.
 * @param path The old property path.
 * @param transform An optional transform for the value.
 * @returns A function that returns `true` if the configuration was modified.
 */
export const upgradeWithOverrides = function (
  path: string,
  transform: (valueIn: unknown) => unknown,
): (obj: RawFrigateCardConfig) => boolean {
  return upgradeMoveToWithOverrides(path, path, { transform: transform });
};

/**
 * Given a path to an array, apply an upgrade to each object in the array.
 * @param arrayPath The path to the array to upgrade.
 * @param upgrade A function that applies an upgrade to an object.
 * @param getObject A optional function that takes an item in the array and
 * returns the object to modify within it.
 * @returns A function that returns `true` if the configuration was modified.
 */
export const upgradeArrayOfObjects = function (
  arrayPath: string,
  upgrade: (obj: RawFrigateCardConfig) => boolean,
  getObject?: (obj: RawFrigateCardConfig) => RawFrigateCardConfig | undefined,
): (obj: RawFrigateCardConfig) => boolean {
  return function (obj: RawFrigateCardConfig): boolean {
    let modified = false;
    const array = getConfigValue(obj, arrayPath);
    if (Array.isArray(array)) {
      array.forEach((item) => {
        const object = getObject ? getObject(item) : item;
        if (object && typeof object === 'object') {
          modified = upgrade(object) || modified;
        }
      });
    }
    return modified;
  };
};

/**
 * Recursively upgrade an object.
 * @param transform A transform applied to each object recursively.
 * @param getObject A function to get the object to be upgraded.
 * @returns An upgrade function.
 */
export const upgradeObjectRecursively = (
  transform: (data: RawFrigateCardConfig) => boolean,
  getObject?: (data: RawFrigateCardConfig) => RawFrigateCardConfig | undefined | null,
): ((data: RawFrigateCardConfig) => boolean) => {
  const recurse = (data: RawFrigateCardConfig): boolean => {
    let result = false;
    if (data && typeof data === 'object') {
      const object = getObject ? getObject(data) : data;
      if (object) {
        result = transform(object) || result;
      }
      if (Array.isArray(data)) {
        data.forEach((item: RawFrigateCardConfig) => {
          result = recurse(item) || result;
        });
      } else {
        Object.keys(data).forEach((key) => {
          result = recurse(data[key] as RawFrigateCardConfig) || result;
        });
      }
    }
    return result;
  };
  return recurse;
};

// *************************************************************************
//              Upgrade Related Functions: Generic Transforms
// *************************************************************************

/**
 * Create a transform that will cap a numeric value.
 * @param value The value.
 * @returns A number or null.
 */
export const createRangedTransform = function (
  transform: (value: unknown) => unknown,
  min?: number,
  max?: number,
): (valueIn: unknown) => unknown {
  return (value: unknown): unknown => {
    let transformed = transform(value);
    if (typeof transformed !== 'number') {
      return transformed;
    }
    transformed = min !== undefined ? Math.max(min, transformed as number) : transformed;
    transformed = max !== undefined ? Math.min(max, transformed as number) : transformed;
    return transformed;
  };
};

/**
 * Request a property be deleted.
 * @param _value Inbound value (not required).
 * @returns `null` to request the property be deleted.
 */
// eslint-disable-next-line @typescript-eslint/no-unused-vars
export const deleteTransform = function (_value: unknown): number | null | undefined {
  return null;
};

// *************************************************************************
//        Upgrade Related Functions: Specific Transforms / Upgraders
// *************************************************************************

/**
 * Transform mediaLoaded -> media_loaded
 * @param data Input data.
 * @returns `true` if the configuration was modified.
 */
const conditionMediaLoadedTransform = (data: unknown): boolean => {
  if (typeof data === 'object' && data && data['mediaLoaded'] !== undefined) {
    data['media_loaded'] = data['mediaLoaded'];
    delete data['mediaLoaded'];
    return true;
  }
  return false;
};

/**
 * Transform service_data -> data
 * See: https://github.com/dermotduffy/frigate-hass-card/issues/1103
 * @param data Input data.
 * @returns `true` if the configuration was modified.
 */
const serviceDataToDataTransform = (data: unknown): boolean => {
  if (
    typeof data === 'object' &&
    data &&
    data['action'] === 'call-service' &&
    data['service'] !== undefined &&
    data['service_data'] !== undefined &&
    data['data'] === undefined
  ) {
    data['data'] = data['service_data'];
    delete data['service_data'];
    return true;
  }
  return false;
};

/**
 * Transform action frigate_ui -> camera_ui
 * @param data Input data.
 * @returns `true` if the configuration was modified.
 */
const frigateUIActionTransform = (data: unknown): boolean => {
  if (
    typeof data === 'object' &&
    data &&
    data['action'] === 'custom:frigate-card-action' &&
    data['frigate_card_action'] === 'frigate_ui'
  ) {
    data['frigate_card_action'] = 'camera_ui';
    return true;
  }
  return false;
};

/**
 * Transform element PTZ to native live PTZ.
 * @param data Input data.
 * @returns `true` if the configuration was modified.
 */
const upgradePTZElementsToLive = function (): (data: unknown) => boolean {
  return function (data: unknown): boolean {
    if (
      typeof data !== 'object' ||
      !data ||
      !(CONF_ELEMENTS in data) ||
      !Array.isArray(data[CONF_ELEMENTS])
    ) {
      return false;
    }

    let foundPTZ = false;
    const movePTZ = (element: RawFrigateCardConfig): void => {
      if (!foundPTZ) {
        if (!get(data, 'live.controls.ptz')) {
          // eslint-disable-next-line @typescript-eslint/no-unused-vars
          const { type: _, ...newPTZ } = element;
          set(data, 'live.controls.ptz', newPTZ);
        }
        foundPTZ = true;
      }
    };

    const processElements = (
      elements: RawFrigateCardConfigArray,
    ): RawFrigateCardConfigArray => {
      const newElements: RawFrigateCardConfigArray = [];
      for (const element of elements) {
        if (element['type'] === 'custom:frigate-card-ptz') {
          movePTZ(element);
        } else if (
          (element['type'] === 'conditional' ||
            element['type'] === 'custom:frigate-card-conditional') &&
          Array.isArray(element['elements'])
        ) {
          const newConditionalElements = processElements(element['elements']);
          if (newConditionalElements.length) {
            element['elements'] = newConditionalElements;
            newElements.push(element);
          }
        } else {
          newElements.push(element);
        }
      }
      return newElements;
    };

    const newElements = processElements(data[CONF_ELEMENTS]);

    if (foundPTZ) {
      if (newElements.length) {
        data[CONF_ELEMENTS] = newElements;
      } else {
        delete data[CONF_ELEMENTS];
      }
    }
    return foundPTZ;
  };
};

const UPGRADES = [
  // v4.0.0 -> v4.1.0
  upgradeArrayOfObjects(
    CONF_OVERRIDES,
    conditionMediaLoadedTransform,
    (data) => data.conditions as RawFrigateCardConfig | undefined,
  ),
  (data: unknown): boolean => {
    return upgradeObjectRecursively(
      conditionMediaLoadedTransform,
      (data) => data.conditions as RawFrigateCardConfig | undefined,
    )(typeof data === 'object' && data ? data[CONF_ELEMENTS] : {});
  },
  upgradeMoveToWithOverrides('event_gallery', CONF_MEDIA_GALLERY),
  upgradeMoveToWithOverrides('menu.buttons.frigate_ui', CONF_MENU_BUTTONS_CAMERA_UI),
  (data: unknown): boolean => {
    return upgradeObjectRecursively(frigateUIActionTransform)(
      typeof data === 'object' && data ? <RawFrigateCardConfig>data : {},
    );
  },
  upgradeArrayOfObjects(
    CONF_CAMERAS,
    upgradeWithOverrides('live_provider', (val) =>
      val === 'frigate-jsmpeg' ? 'jsmpeg' : val,
    ),
  ),
  upgradeMoveToWithOverrides('live.jsmpeg', CONF_CAMERAS_GLOBAL_JSMPEG),
  upgradeMoveToWithOverrides('live.image', CONF_CAMERAS_GLOBAL_IMAGE),
  upgradeMoveToWithOverrides('live.webrtc_card', CONF_CAMERAS_GLOBAL_WEBRTC_CARD),
  upgradeArrayOfObjects(
    CONF_CAMERAS,
    upgradeMoveToWithOverrides('frigate.zone', 'frigate.zones', {
      transform: (zone) => arrayify(zone),
    }),
  ),
  upgradeArrayOfObjects(
    CONF_CAMERAS,
    upgradeMoveToWithOverrides('frigate.label', 'frigate.labels', {
      transform: (label) => arrayify(label),
    }),
  ),

  // v5.2.0 -> v6.0.0
  (data: unknown): boolean => {
    return upgradeObjectRecursively(serviceDataToDataTransform)(
      typeof data === 'object' && data ? <RawFrigateCardConfig>data : {},
    );
  },
  upgradePTZElementsToLive(),
  upgradeMoveToWithOverrides(
    'view.scan.untrigger_reset',
    CONF_VIEW_SCAN_ACTIONS_UNTRIGGER,
    {
      // Delete the value if it's set to the default.
      transform: (val) => (val ? 'default' : null),
    },
  ),
];