import { Component, OnInit } from '@angular/core'
import { DomSanitizer, SafeUrl } from '@angular/platform-browser'

import { SearchService } from 'src/app/core/services/search.service'
import { SettingsService } from 'src/app/core/services/settings.service'
import { groupBy } from 'src/electron/shared/UtilFunctions'
import { SongResult } from '../../../../electron/shared/interfaces/search.interface'
import { ChartedDifficulty, getInstrumentIcon, Instrument, VersionResult } from '../../../../electron/shared/interfaces/songDetails.interface'
import { AlbumArtService } from '../../../core/services/album-art.service'
import { DownloadService } from '../../../core/services/download.service'
import { ElectronService } from '../../../core/services/electron.service'

interface Difficulty {
	instrument: string
	diffNumber: string
	chartedDifficulties: string
}

@Component({
	selector: 'app-chart-sidebar',
	templateUrl: './chart-sidebar.component.html',
	styleUrls: ['./chart-sidebar.component.scss'],
})
export class ChartSidebarComponent implements OnInit {

	songResult: SongResult
	selectedVersion: VersionResult
	charts: VersionResult[][]

	albumArtSrc: SafeUrl = ''
	charterPlural: string
	songLength: string
	difficultiesList: Difficulty[]
	downloadButtonText: string

	constructor(
		private electronService: ElectronService,
		private albumArtService: AlbumArtService,
		private downloadService: DownloadService,
		private searchService: SearchService,
		private sanitizer: DomSanitizer,
		public settingsService: SettingsService
	) { }

	ngOnInit() {
		this.searchService.onNewSearch(() => {
			this.selectVersion(undefined)
			this.songResult = undefined
		})
	}

	/**
	 * Displays the information for the selected song.
	 */
	async onRowClicked(result: SongResult) {
		if (this.songResult == undefined || result.id != this.songResult.id) { // Clicking the same row again will not reload
			this.songResult = result
			const albumArt = this.albumArtService.getImage(result.id)
			const results = await this.electronService.invoke('song-details', result.id)
			this.charts = groupBy(results, 'chartID').sort((v1, v2) => v1[0].chartName.length - v2[0].chartName.length)
			this.sortCharts()
			await this.selectChart(this.charts[0][0].chartID)
			this.initChartDropdown()

			this.updateAlbumArtSrc(await albumArt)
		}
	}

	/**
	 * Sorts `this.charts` and its subarrays in the correct order.
	 * The chart dropdown should display in a random order, but verified charters are prioritized.
	 * The version dropdown should be ordered by lastModified date.
	 * (but prefer the non-pack version if it's only a few days older)
	 */
	private sortCharts() {
		for (const chart of this.charts) {
			// TODO: sort by verified charter
			this.searchService.sortChart(chart)
		}
	}

	/**
	 * Updates the sidebar to display the album art.
	 */
	updateAlbumArtSrc(albumArtBase64String?: string) {
		if (albumArtBase64String) {
			this.albumArtSrc = this.sanitizer.bypassSecurityTrustUrl('data:image/jpg;base64,' + albumArtBase64String)
		} else {
			this.albumArtSrc = null
		}
	}

	/**
	 * Initializes the chart dropdown from `this.charts` (or removes it if there's only one chart).
	 */
	private initChartDropdown() {
		const values = this.charts.map(chart => {
			const version = chart[0]
			return {
				value: version.chartID,
				text: version.chartName,
				name: `${version.chartName} <b>[${version.charters}]</b>`,
			}
		})
		const $chartDropdown = $('#chartDropdown')
		$chartDropdown.dropdown('setup menu', { values })
		$chartDropdown.dropdown('setting', 'onChange', (chartID: number) => this.selectChart(chartID))
		$chartDropdown.dropdown('set selected', values[0].value)
	}

	private async selectChart(chartID: number) {
		const chart = this.charts.find(chart => chart[0].chartID == chartID)
		await this.selectVersion(chart[0])
		this.initVersionDropdown()
	}

	/**
	 * Updates the sidebar to display the metadata for `selectedVersion`.
	 */
	async selectVersion(selectedVersion: VersionResult) {
		this.selectedVersion = selectedVersion
		await new Promise<void>(resolve => setTimeout(() => resolve(), 0)) // Wait for *ngIf to update DOM

		if (this.selectedVersion != undefined) {
			this.updateCharterPlural()
			this.updateSongLength()
			this.updateDifficultiesList()
			this.updateDownloadButtonText()
		}
	}

	/**
	 * Chooses to display 'Charter:' or 'Charters:'.
	 */
	private updateCharterPlural() {
		this.charterPlural = this.selectedVersion.charterIDs.split('&').length == 1 ? 'Charter:' : 'Charters:'
	}

	/**
	 * Converts `this.selectedVersion.chartMetadata.length` into a readable duration.
	 */
	private updateSongLength() {
		let seconds = this.selectedVersion.songLength
		if (seconds < 60) { this.songLength = `${seconds} second${seconds == 1 ? '' : 's'}`; return }
		let minutes = Math.floor(seconds / 60)
		let hours = 0
		while (minutes > 59) {
			hours++
			minutes -= 60
		}
		seconds = Math.floor(seconds % 60)
		this.songLength = `${hours == 0 ? '' : hours + ':'}${minutes == 0 ? '' : minutes + ':'}${seconds < 10 ? '0' + seconds : seconds}`
	}

	/**
	 * Updates `dfficultiesList` with the difficulty information for the selected version.
	 */
	private updateDifficultiesList() {
		const instruments = Object.keys(this.selectedVersion.chartData.noteCounts) as Instrument[]
		this.difficultiesList = []
		for (const instrument of instruments) {
			if (instrument != 'undefined') {
				this.difficultiesList.push({
					instrument: getInstrumentIcon(instrument),
					diffNumber: this.getDiffNumber(instrument),
					chartedDifficulties: this.getChartedDifficultiesText(instrument),
				})
			}
		}
	}

	/**
	 * @returns a string describing the difficulty number in the selected version.
	 */
	private getDiffNumber(instrument: Instrument) {
		const diffNumber: number = this.selectedVersion[`diff_${instrument}`]
		return diffNumber == -1 || diffNumber == undefined ? 'Unknown' : String(diffNumber)
	}

	/**
	 * @returns a string describing the list of charted difficulties in the selected version.
	 */
	private getChartedDifficultiesText(instrument: Instrument) {
		const difficulties = Object.keys(this.selectedVersion.chartData.noteCounts[instrument]) as ChartedDifficulty[]
		if (difficulties.length == 4) { return 'Full Difficulty' }
		const difficultyNames = []
		if (difficulties.includes('x')) { difficultyNames.push('Expert') }
		if (difficulties.includes('h')) { difficultyNames.push('Hard') }
		if (difficulties.includes('m')) { difficultyNames.push('Medium') }
		if (difficulties.includes('e')) { difficultyNames.push('Easy') }

		return difficultyNames.join(', ')
	}

	/**
	 * Chooses the text to display on the download button.
	 */
	private updateDownloadButtonText() {
		this.downloadButtonText = 'Download'
		if (this.selectedVersion.driveData.inChartPack) {
			this.downloadButtonText += ' Chart Pack'
		} else {
			this.downloadButtonText += (this.selectedVersion.driveData.isArchive ? ' Archive' : ' Files')
		}

		if (this.getSelectedChartVersions().length > 1) {
			if (this.selectedVersion.versionID == this.selectedVersion.latestVersionID) {
				this.downloadButtonText += ' (Latest)'
			} else {
				this.downloadButtonText += ` (${this.getLastModifiedText(this.selectedVersion.lastModified)})`
			}
		}
	}

	/**
	 * Initializes the version dropdown from `this.selectedVersion` (or removes it if there's only one version).
	 */
	private initVersionDropdown() {
		const $versionDropdown = $('#versionDropdown')
		const versions = this.getSelectedChartVersions()
		const values = versions.map(version => ({
			value: version.versionID,
			text: 'Uploaded ' + this.getLastModifiedText(version.lastModified),
			name: 'Uploaded ' + this.getLastModifiedText(version.lastModified),
		}))

		$versionDropdown.dropdown('setup menu', { values })
		$versionDropdown.dropdown('setting', 'onChange', (versionID: number) => {
			this.selectVersion(versions.find(version => version.versionID == versionID))
		})
		$versionDropdown.dropdown('set selected', values[0].value)
	}

	/**
	 * Returns the list of versions for the selected chart, sorted by `lastModified`.
	 */
	getSelectedChartVersions() {
		return this.charts.find(chart => chart[0].chartID == this.selectedVersion.chartID)
	}

	/**
	 * Converts the <lastModified> value to a user-readable format.
	 * @param lastModified The UNIX timestamp for the lastModified date.
	 */
	private getLastModifiedText(lastModified: string) {
		const date = new Date(lastModified)
		const day = date.getDate().toString().padStart(2, '0')
		const month = (date.getMonth() + 1).toString().padStart(2, '0')
		const year = date.getFullYear().toString().substr(-2)
		return `${month}/${day}/${year}`
	}

	/**
	 * Opens the proxy link or source folder in the default browser.
	 */
	onSourceLinkClicked() {
		const source = this.selectedVersion.driveData.source
		this.electronService.sendIPC('open-url', source.proxyLink ?? `https://drive.google.com/drive/folders/${source.sourceDriveID}`)
	}

	/**
	 * @returns `true` if the source folder button should be shown.
	 */
	shownFolderButton() {
		const driveData = this.selectedVersion.driveData
		return driveData.source.proxyLink || driveData.source.sourceDriveID != driveData.folderID
	}

	/**
	 * Opens the chart folder in the default browser.
	 */
	onFolderButtonClicked() {
		this.electronService.sendIPC('open-url', `https://drive.google.com/drive/folders/${this.selectedVersion.driveData.folderID}`)
	}

	/**
	 * Adds the selected version to the download queue.
	 */
	onDownloadClicked() {
		this.downloadService.addDownload(
			this.selectedVersion.versionID, {
			chartName: this.selectedVersion.chartName,
			artist: this.songResult.artist,
			charter: this.selectedVersion.charters,
			driveData: this.selectedVersion.driveData,
		})
	}
}