/**
 * Copyright 2024-2026 Wingify Software Pvt. Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { Struct, array, boolean, number, object, optional, refine, string, type, union, validate } from 'superstruct';

import { dynamic } from '../../types/Common';
import { SettingsModel } from '../settings/SettingsModel';

export class SettingsSchema {
  private campaignMetricSchema: Struct<dynamic>;
  private variableObjectSchema: Struct<dynamic>;
  private campaignVariationSchema: Struct<dynamic>;
  private campaignObjectSchema: Struct<dynamic>;
  private settingsSchema: Struct<dynamic>;
  private featureSchema: Struct<dynamic>;
  private ruleSchema: Struct<dynamic>;
  private holdoutSchema: Struct<dynamic>;

  constructor() {
    this.initializeSchemas();
  }

  private initializeSchemas(): void {
    this.campaignMetricSchema = type({
      id: union([number(), string()]),
      type: string(),
      identifier: string(),
      mca: optional(union([number(), string()])),
      hasProps: optional(boolean()),
      revenueProp: optional(string()),
    });

    this.variableObjectSchema = type({
      id: union([number(), string()]),
      type: string(),
      key: string(),
      value: union([number(), string(), boolean(), object()]),
    });

    this.campaignVariationSchema = type({
      id: union([number(), string()]),
      name: string(),
      weight: union([number(), string()]),
      segments: optional(object()),
      variables: optional(array(this.variableObjectSchema)),
      startRangeVariation: optional(number()),
      endRangeVariation: optional(number()),
      salt: optional(string()),
    });

    this.campaignObjectSchema = type({
      id: union([number(), string()]),
      type: string(),
      key: string(),
      percentTraffic: optional(number()),
      status: string(),
      variations: array(this.campaignVariationSchema),
      segments: object(),
      isForcedVariationEnabled: optional(boolean()),
      isAlwaysCheckSegment: optional(boolean()),
      name: string(),
      salt: optional(string()),
    });

    this.ruleSchema = type({
      type: string(),
      ruleKey: string(),
      campaignId: number(),
      variationId: optional(number()),
    });

    this.featureSchema = type({
      id: union([number(), string()]),
      key: string(),
      status: string(),
      name: string(),
      type: string(),
      metrics: array(this.campaignMetricSchema),
      impactCampaign: optional(object()),
      rules: optional(array(this.ruleSchema)),
      variables: optional(array(this.variableObjectSchema)),
    });

    this.holdoutSchema = type({
      metrics: array(this.campaignMetricSchema),
      segments: object(),
      featureIds: array(number()),
      isGlobal: boolean(),
      name: string(),
      id: union([number(), string()]),
      percentTraffic: number(),
    });

    // holdouts: optional. Backend sends {} when no holdouts; [] or [holdout, ...] when 1+ present.
    // Union: either an array (each item validated by holdoutSchema) or a strict empty object {}.
    const holdoutsSchema = union([
      array(this.holdoutSchema),
      refine(object(), 'EmptyObject', (v) => Object.keys(v).length === 0),
    ]);

    this.settingsSchema = type({
      sdkKey: optional(string()),
      version: union([number(), string()]),
      accountId: union([number(), string()]),
      usageStatsAccountId: optional(number()),
      features: optional(array(this.featureSchema)),
      holdouts: optional(holdoutsSchema),
      campaigns: array(this.campaignObjectSchema),
      groups: optional(object()),
      campaignGroups: optional(object()),
      collectionPrefix: optional(string()),
      sdkMetaInfo: optional(object({ wasInitializedEarlier: optional(boolean()) })),
      pollInterval: optional(number()),
    });
  }

  isSettingsValid(settings: any | SettingsModel): boolean {
    if (!settings) {
      return false;
    }

    const [error] = validate(settings, this.settingsSchema);
    return !error;
  }
}