/**
 * Internal dependencies
 */
import type { Experiment } from './experiments';
import type { Url } from './utils';
import type { PostId } from './wordpress';

export type OptimizationScore = {
	readonly value: number;
	readonly breakdown: {
		readonly running: number;
		readonly recentlyFinished: number;
		readonly cadence: number;
		readonly coverage: number;
		readonly inactivityPenalty: number;
	};
};

export type Opportunity = OpportunityDetails & {
	readonly score: number;
	readonly target: OpportunityTarget;
};

export type OpportunityType = Opportunity[ 'type' ];

export type OpportunityTarget =
	| {
			readonly type: 'post';
			readonly postType: string;
			readonly postId: PostId;
			readonly title: string;
			readonly url: Url;
	  }
	| {
			readonly type: 'url';
			readonly title: string;
			readonly url: Url;
	  };

export type KeyPageMeta = {
	readonly reason: string;
};

export type OpportunityMultipleReasonsMeta = {
	readonly opportunities: ReadonlyArray< Opportunity >;
};

export type OpportunityViewsMeta = {
	readonly views: number;
};

export type OpportunityPostMeta = {
	readonly publishDate: string;
};

export type OpportunityExperimentMeta = {
	readonly experiment: {
		readonly experimentId: Experiment[ 'id' ];
		readonly experimentName: Experiment[ 'name' ];
		readonly experimentType: Experiment[ 'type' ];
		readonly description: Experiment[ 'description' ];
		readonly alternatives: Experiment[ 'alternatives' ];
		readonly goals: Experiment[ 'goals' ];
		readonly segments: Experiment[ 'segments' ];
		readonly testedAt: Experiment[ 'endDate' ];
	};
};

export type RunningExperimentSummary = {
	readonly id: Experiment[ 'id' ];
	readonly type: string;
	readonly name: string;
	readonly startedAt: string;
	readonly alternativeCount: number;
	readonly resultUrl: string;
};

export type PendingExperimentSummary = {
	readonly id: Experiment[ 'id' ];
	readonly type: string;
	readonly name: string;
	readonly editUrl: string;
};

export type FinishedExperimentSummary = {
	readonly id: Experiment[ 'id' ];
	readonly name: Experiment[ 'name' ];
	readonly endDate: string;
	readonly resultUrl: string;
};

// =======
// HELPERS
// =======

type OpportunityDetails =
	| {
			readonly type: 'multiple-reasons';
			readonly meta: OpportunityMultipleReasonsMeta;
	  }
	| {
			readonly type: 'key-page';
			readonly meta: KeyPageMeta;
	  }
	| {
			readonly type: 'high-traffic';
			readonly meta: OpportunityViewsMeta;
	  }
	| {
			readonly type: 'recently-finished-experiment';
			readonly meta: OpportunityExperimentMeta;
	  }
	| {
			readonly type: 'recently-published';
			readonly meta: OpportunityPostMeta;
	  }
	| {
			readonly type: 'stale-experiment';
			readonly meta: OpportunityExperimentMeta;
	  };