import { existsSync, mkdirSync, readdirSync, readFileSync, rmSync } from 'fs'
import { join } from 'path'
import { optimize } from 'svgo'
import {
	readJsonIfExists,
	REPO_ROOT,
	writeCodeFile,
	writeFile,
	writeJsonFile,
	writeStringFile,
} from './lib/file'
import { nicelog } from './lib/nicelog'

// We'll need to copy the assets into these folders
const PUBLIC_FOLDER_PATHS = [join(REPO_ROOT, 'packages', 'assets')]

const FONT_MAPPING: Record<string, string> = {
	'IBMPlexMono-Medium': 'monospace',
	'IBMPlexSerif-Medium': 'serif',
	'IBMPlexSans-Medium': 'sansSerif',
	'Shantell_Sans-Tldrawish': 'draw',
}

const ASSETS_FOLDER_PATH = join(REPO_ROOT, 'assets')

const collectedAssetUrls: {
	fonts: Record<string, string>
	icons: Record<string, string>
	translations: Record<string, string>
	embedIcons: Record<string, string>
} = {
	fonts: {},
	icons: {},
	translations: {},
	embedIcons: {},
}

// 1. ICONS

async function copyIcons() {
	// Get a list of all icons
	const icons = readdirSync(join(ASSETS_FOLDER_PATH, 'icons', 'icon')).filter((icon) =>
		icon.endsWith('.svg')
	)

	// Write list of names into icon-names.json (just the name, not extension)
	const iconNames = icons.map((name) => name.replace('.svg', ''))

	const sourceFolderPath = join(ASSETS_FOLDER_PATH, 'icons', 'icon')

	// Create the optimized SVGs
	const optimizedSvgs = icons.map((icon) => {
		const iconPath = join(sourceFolderPath, icon)
		const content = readFileSync(iconPath, 'utf8')
		const svg = optimize(content, { path: iconPath })
		return { fileName: icon, data: svg.data }
	})

	// Optimize all of the svg icons and write them into the new folders
	for (const folderPath of PUBLIC_FOLDER_PATHS) {
		const publicIconsRootFolderPath = join(folderPath, 'icons')
		const pulicIconsFolderPath = join(publicIconsRootFolderPath, 'icon')

		if (existsSync(publicIconsRootFolderPath)) {
			rmSync(publicIconsRootFolderPath, { recursive: true })
		}

		// Create the folders
		mkdirSync(publicIconsRootFolderPath, { recursive: true })
		mkdirSync(pulicIconsFolderPath, { recursive: true })

		// Copy each optimized icons into the new folder
		for (const { fileName, data } of optimizedSvgs) {
			await writeStringFile(join(pulicIconsFolderPath, fileName), data)
		}

		// Write the JSON file containing all of the names of the icons
		await writeJsonFile(join(pulicIconsFolderPath, 'icon-names.json'), iconNames)
	}

	// Get the names of all of the svg icons and create a TypeScript file of valid icon names
	const iconTypeFile = `
		/** @public */
		export type TLUiIconType = 
			${icons.map((icon) => JSON.stringify(icon.replace('.svg', ''))).join(' | ')}

		/** @public */
		export const iconTypes = [
			${icons.map((icon) => JSON.stringify(icon.replace('.svg', ''))).join(', ')}
		] as const`

	await writeCodeFile(
		'scripts/refresh-assets.ts',
		'typescript',
		join(REPO_ROOT, 'packages', 'tldraw', 'src', 'lib', 'ui', 'icon-types.ts'),
		iconTypeFile
	)

	// add to the asset declaration file
	for (const icon of icons) {
		const name = icon.replace('.svg', '')
		collectedAssetUrls.icons[name] = `icons/icon/${icon}`
	}
}

// 2. EMBED-ICONS

async function copyEmbedIcons() {
	const folderName = 'embed-icons'
	const extension = '.png'

	const sourceFolderPath = join(ASSETS_FOLDER_PATH, folderName)
	const itemsToCopy = readdirSync(sourceFolderPath).filter((icon) => icon.endsWith(extension))

	for (const publicFolderPath of PUBLIC_FOLDER_PATHS) {
		const destinationFolderPath = join(publicFolderPath, folderName)

		// Delete the folder if it exists
		if (existsSync(destinationFolderPath)) {
			rmSync(destinationFolderPath, { recursive: true })
		}

		// Make the new folder
		mkdirSync(destinationFolderPath, { recursive: true })

		// Copy all items into the new folder
		for (const item of itemsToCopy) {
			await writeFile(join(destinationFolderPath, item), readFileSync(join(sourceFolderPath, item)))
		}
	}

	// add to the asset declaration file
	for (const item of itemsToCopy) {
		const name = item.replace(extension, '')
		collectedAssetUrls.embedIcons[name] = `${folderName}/${item}`
	}
}

// 3. FONTS

async function copyFonts() {
	const folderName = 'fonts'
	const extension = '.woff2'

	const sourceFolderPath = join(ASSETS_FOLDER_PATH, folderName)
	const itemsToCopy = readdirSync(sourceFolderPath).filter((icon) => icon.endsWith(extension))

	for (const publicFolderPath of PUBLIC_FOLDER_PATHS) {
		const destinationFolderPath = join(publicFolderPath, folderName)

		// Delete the folder if it exists
		if (existsSync(destinationFolderPath)) {
			rmSync(destinationFolderPath, { recursive: true })
		}

		// Make the new folder
		mkdirSync(destinationFolderPath)

		// Copy all items into the new folder
		for (const item of itemsToCopy) {
			await writeFile(join(destinationFolderPath, item), readFileSync(join(sourceFolderPath, item)))
		}
	}

	// add to the asset declaration file
	for (const item of itemsToCopy) {
		const itemWithoutExtension = item.replace(extension, '')
		const name = FONT_MAPPING[itemWithoutExtension]
		if (!name) {
			nicelog('Font mapping not found for', itemWithoutExtension)
			process.exit(1)
		}
		collectedAssetUrls.fonts[name] = `${folderName}/${item}`
	}
}

// 3. TRANSLATIONS

async function copyTranslations() {
	const folderName = 'translations'
	const extension = '.json'

	const sourceFolderPath = join(ASSETS_FOLDER_PATH, folderName)
	const itemsToCopy = readdirSync(sourceFolderPath).filter((item) => item.endsWith(extension))

	for (const publicFolderPath of PUBLIC_FOLDER_PATHS) {
		const destinationFolderPath = join(publicFolderPath, folderName)

		// Delete the folder if it exists
		if (existsSync(destinationFolderPath)) {
			rmSync(destinationFolderPath, { recursive: true })
		}

		// Make the new folder
		mkdirSync(destinationFolderPath)

		// Copy all items into the new folder
		for (const item of itemsToCopy) {
			await writeFile(join(destinationFolderPath, item), readFileSync(join(sourceFolderPath, item)))
		}
	}

	// Create hardcoded files
	const uiPath = join(
		REPO_ROOT,
		'packages',
		'tldraw',
		'src',
		'lib',
		'ui',
		'hooks',
		'useTranslation'
	)

	// languages.ts

	const languagesSource = await readJsonIfExists(join(sourceFolderPath, 'languages.json'))!
	const languagesFile = `
		/** @public */
		export const LANGUAGES = ${JSON.stringify(languagesSource)} as const
	`
	const schemaPath = join(REPO_ROOT, 'packages', 'tlschema', 'src', 'translations')
	const schemaLanguagesFilePath = join(schemaPath, 'languages.ts')
	await writeCodeFile(
		'scripts/refresh-assets.ts',
		'typescript',
		schemaLanguagesFilePath,
		languagesFile
	)

	// main.ts

	const defaultTranslation = await readJsonIfExists(join(sourceFolderPath, 'main.json'))!
	const defaultTranslationFilePath = join(uiPath, 'defaultTranslation.ts')
	const defaultTranslationFile = `
		/** @internal */
		export const DEFAULT_TRANSLATION = ${JSON.stringify(defaultTranslation)}
	`
	await writeCodeFile(
		'scripts/refresh-assets.ts',
		'typescript',
		defaultTranslationFilePath,
		defaultTranslationFile
	)

	// translationKeys.ts

	const translationKeys = Object.keys(defaultTranslation).map((key) => `'${key}'`)
	const translationKeysFilePath = join(uiPath, 'TLUiTranslationKey.ts')
	const translationKeysFile = `
		/** @public */
		export type TLUiTranslationKey = ${translationKeys.join(' | ')}
	`
	await writeCodeFile(
		'scripts/refresh-assets.ts',
		'typescript',
		translationKeysFilePath,
		translationKeysFile
	)

	// add to the asset declaration file
	for (const item of itemsToCopy) {
		const name = item.replace(extension, '')
		collectedAssetUrls.translations[name] = `${folderName}/${item}`
	}
}

// 4. ASSET DECLARATION FILES
async function writeUrlBasedAssetDeclarationFile() {
	const codeFilePath = join(REPO_ROOT, 'packages', 'assets', 'urls.js')
	const codeFile = `
		// eslint-disable-next-line @typescript-eslint/triple-slash-reference
		/// <reference path="./modules.d.ts" />
		import { formatAssetUrl } from './utils.js'

		/**
		 * @param {AssetUrlOptions} [opts]
		 * @public
		 */
		export function getAssetUrlsByMetaUrl(opts) {
			return {
				${Object.entries(collectedAssetUrls)
					.flatMap(([type, assets]) => [
						`${type}: {`,
						...Object.entries(assets).map(
							([name, href]) =>
								`${JSON.stringify(name)}: formatAssetUrl(new URL(${JSON.stringify(
									'./' + href
								)}, import.meta.url).href, opts),`
						),
						'},',
					])
					.join('\n')}
			}
		}
	`

	await writeCodeFile('scripts/refresh-assets.ts', 'javascript', codeFilePath, codeFile)
}

async function writeImportBasedAssetDeclarationFile(): Promise<void> {
	let imports = `
		// eslint-disable-next-line @typescript-eslint/triple-slash-reference
		/// <reference path="./modules.d.ts" />
		import { formatAssetUrl } from './utils.js'

	`

	let declarations = `
		/**
		 * @param {AssetUrlOptions} [opts]
		 * @public
		 */
		export function getAssetUrlsByImport(opts) {
			return {
	`

	for (const [type, assets] of Object.entries(collectedAssetUrls)) {
		declarations += `${type}: {\n`
		for (const [name, href] of Object.entries(assets)) {
			const variableName = `${type}_${name}`
				.replace(/[^a-zA-Z0-9_]/g, '_')
				.replace(/_+/g, '_')
				.replace(/_(.)/g, (_, letter) => letter.toUpperCase())
			imports += `import ${variableName} from ${JSON.stringify('./' + href)};\n`
			declarations += `${JSON.stringify(name)}: formatAssetUrl(${variableName}, opts),\n`
		}
		declarations += '},\n'
	}

	declarations += `
			}
		}
	`

	const codeFilePath = join(REPO_ROOT, 'packages', 'assets', 'imports.js')
	await writeCodeFile(
		'scripts/refresh-assets.ts',
		'javascript',
		codeFilePath,
		imports + declarations
	)
}

async function writeSelfHostedAssetDeclarationFile(): Promise<void> {
	const codeFilePath = join(REPO_ROOT, 'packages', 'assets', 'selfHosted.js')
	const codeFile = `
		// eslint-disable-next-line @typescript-eslint/triple-slash-reference
		/// <reference path="./modules.d.ts" />
		import { formatAssetUrl } from './utils.js'

		/**
		 * @param {AssetUrlOptions} [opts]
		 * @public
		 */
		export function getAssetUrls(opts) {
			return {
				${Object.entries(collectedAssetUrls)
					.flatMap(([type, assets]) => [
						`${type}: {`,
						...Object.entries(assets).map(
							([name, href]) =>
								`${JSON.stringify(name)}: formatAssetUrl(${JSON.stringify('./' + href)}, opts),`
						),
						'},',
					])
					.join('\n')}
			}
		}
	`

	await writeCodeFile('scripts/refresh-assets.ts', 'javascript', codeFilePath, codeFile)
}

async function writeAssetDeclarationDTSFile() {
	let dts = `
		export type AssetUrl = string | { src: string }
		export type AssetUrlOptions = { baseUrl?: string } | ((assetUrl: string) => string)
		export type AssetUrls = {
	`

	for (const [type, assets] of Object.entries(collectedAssetUrls)) {
		dts += `${type}: {\n`
		for (const name of Object.keys(assets)) {
			dts += `${JSON.stringify(name)}: string,\n`
		}
		dts += '},\n'
	}

	dts += `
		}
	`

	const assetDeclarationFilePath = join(REPO_ROOT, 'packages', 'assets', 'types.d.ts')
	await writeCodeFile('scripts/refresh-assets.ts', 'typescript', assetDeclarationFilePath, dts)
}

// --- RUN
async function main() {
	nicelog('Copying icons...')
	await copyIcons()
	nicelog('Copying embed icons...')
	await copyEmbedIcons()
	nicelog('Copying fonts...')
	await copyFonts()
	nicelog('Copying translations...')
	await copyTranslations()
	nicelog('Writing asset declaration file...')
	await writeAssetDeclarationDTSFile()
	await writeUrlBasedAssetDeclarationFile()
	await writeImportBasedAssetDeclarationFile()
	await writeSelfHostedAssetDeclarationFile()
	nicelog('Done!')
}

main()