/* eslint-disable @typescript-eslint/no-empty-interface */
import merge from 'lodash.merge'

import type { MetaData } from 'types'

interface Config {
  site?: SiteConfig
  metadata?: MetaDataConfig
  i18n?: I18NConfig
  apps?: {
    blog?: AppBlogConfig
  }
  ui?: unknown
  analytics?: unknown
}

export interface SiteConfig {
  name: string
  site?: string
  base?: string
  trailingSlash?: boolean
  googleSiteVerificationId?: string
}
export interface MetaDataConfig extends Omit<MetaData, 'title'> {
  title?: {
    default: string
    template: string
  }
}
export interface I18NConfig {
  language: string
  textDirection: string
  dateFormatter?: Intl.DateTimeFormat
}
export interface AppBlogConfig {
  isEnabled: boolean
  postsPerPage: number
  isRelatedPostsEnabled: boolean
  relatedPostsCount: number
  post: {
    isEnabled: boolean
    permalink: string
    robots: {
      index: boolean
      follow: boolean
    }
  }
  list: {
    isEnabled: boolean
    pathname: string
    robots: {
      index: boolean
      follow: boolean
    }
  }
  category: {
    isEnabled: boolean
    pathname: string
    robots: {
      index: boolean
      follow: boolean
    }
  }
  tag: {
    isEnabled: boolean
    pathname: string
    robots: {
      index: boolean
      follow: boolean
    }
  }
}
export interface AnalyticsConfig {
  vendors: {
    googleAnalytics: {
      id?: string
      partytown?: boolean
    }
  }
}

export interface UIConfig {}

const DEFAULT_SITE_NAME = 'Website'

const getSite = (config: Config) => {
	const _default = {
		name: DEFAULT_SITE_NAME,
		site: undefined,
		base: '/',
		trailingSlash: false,

		googleSiteVerificationId: '',
	}

	return merge({}, _default, config?.site ?? {}) as SiteConfig
}

const getMetadata = (config: Config) => {
	const siteConfig = getSite(config)

	const _default = {
		title: {
			default: siteConfig?.name || DEFAULT_SITE_NAME,
			template: '%s',
		},
		description: '',
		robots: {
			index: false,
			follow: false,
		},
		openGraph: {
			type: 'website',
		},
	}

	return merge({}, _default, config?.metadata ?? {}) as MetaDataConfig
}

const getI18N = (config: Config) => {
	const _default = {
		language: 'en',
		textDirection: 'ltr',
	}

	const value = merge({}, _default, config?.i18n ?? {})

	return value as I18NConfig
}

const getAppBlog = (config: Config) => {
	const _default = {
		isEnabled: false,
		postsPerPage: 6,
		isRelatedPostsEnabled: false,
		relatedPostsCount: 4,
		post: {
			isEnabled: true,
			permalink: '/blog/%slug%',
			robots: {
				index: true,
				follow: true,
			},
		},
		list: {
			isEnabled: true,
			pathname: 'blog',
			robots: {
				index: true,
				follow: true,
			},
		},
		category: {
			isEnabled: true,
			pathname: 'category',
			robots: {
				index: true,
				follow: true,
			},
		},
		tag: {
			isEnabled: true,
			pathname: 'tag',
			robots: {
				index: false,
				follow: true,
			},
		},
	}

	return merge({}, _default, config?.apps?.blog ?? {}) as AppBlogConfig
}

const getUI = (config: Config) => {
	const _default = {
		theme: 'system',
	}

	return merge({}, _default, config?.ui ?? {})
}

const getAnalytics = (config: Config) => {
	const _default = {
		vendors: {
			googleAnalytics: {
				id: undefined,
				partytown: true,
			},
		},
	}

	return merge({}, _default, config?.analytics ?? {}) as AnalyticsConfig
}

export default (config: Config) => ({
	SITE: getSite(config),
	I18N: getI18N(config),
	METADATA: getMetadata(config),
	APP_BLOG: getAppBlog(config),
	UI: getUI(config),
	ANALYTICS: getAnalytics(config),
})