import type {
	AbstractPopupNotificationManager,
	AbstractWebNotificationManager,
	CreationFlowContextValue,
	CreationFlowModal,
	SymlinkMethodChoice,
} from '@modrinth/ui'
import { defineMessages, useVIntl } from '@modrinth/ui'
import { join } from '@tauri-apps/api/path'
import { inject, provide, ref, useTemplateRef } from 'vue'
import type { ComponentExposed } from 'vue-component-type-helpers'
import { useRouter } from 'vue-router'

import type UnknownPackWarningModal from '@/components/ui/install_flow/UnknownPackWarningModal.vue'
import type ModpackAlreadyInstalledModal from '@/components/ui/modal/ModpackAlreadyInstalledModal.vue'
import { get_project_versions, get_search_results } from '@/helpers/cache.js'
import { getCurseForgeFiles, hasCompatibleCurseForgeFile } from '@/helpers/curseforge'
import { install_job_listener } from '@/helpers/events.js'
import { import_instance } from '@/helpers/import.js'
import {
	type CreatePackLocation,
	install_create_instance,
	install_create_modpack_instance,
	install_get_modpack_preview,
	type InstallJobSnapshot,
	wait_for_install_job,
} from '@/helpers/install'
import { check_symlink_capability, list } from '@/helpers/instance'
import { get_loader_versions as getLoaderManifest } from '@/helpers/metadata.js'
import type { InstanceLoader } from '@/helpers/types'

const symlinkMessages = defineMessages({
	unsupportedTitle: {
		id: 'app.symlink-capability.unsupported.title',
		defaultMessage: 'Shared instances are unavailable',
	},
	unsupportedBody: {
		id: 'app.symlink-capability.unsupported',
		defaultMessage: 'This system does not support creating symbolic links.',
	},
})

const modpackMessages = defineMessages({
	installing: {
		id: 'app.drop.modpack-installing',
		defaultMessage: 'Installing modpack...',
	},
	installed: {
		id: 'app.drop.modpack-installed-success',
		defaultMessage: 'Modpack installed successfully',
	},
	installingFile: {
		id: 'app.drop.installing-file',
		defaultMessage: 'Installing {name}...',
	},
	unknownFileType: {
		id: 'app.drop.unknown-force-analysis-title',
		defaultMessage: 'Unable to identify file type',
	},
	unknownFileTypeText: {
		id: 'app.drop.unknown-force-analysis-text',
		defaultMessage:
			'This archive needs to be extracted and deeply analyzed to determine its content type. This may take a while. Force analysis?',
	},
	forceAnalysis: {
		id: 'app.drop.unknown-force-analysis-button',
		defaultMessage: 'Force analysis',
	},
	analyzing: {
		id: 'app.drop.unknown-force-analyzing',
		defaultMessage: 'Force analyzing archive...',
	},
	couldNotIdentify: {
		id: 'app.drop.unknown-force-analysis-failed-title',
		defaultMessage: 'Analysis failed',
	},
	couldNotIdentifyText: {
		id: 'app.drop.unknown-force-analysis-failed-text',
		defaultMessage: 'Could not identify the file type even after deep analysis.',
	},
	unexpectedType: {
		id: 'app.drop.unexpected-type',
		defaultMessage: 'Unexpected type: {type}',
	},
})

const OPTIFABRIC_CURSEFORGE_PROJECT_ID = 322385

export function setupCreationModal(
	notificationManager: AbstractWebNotificationManager,
	_popupNotificationManager: AbstractPopupNotificationManager,
) {
	const { formatMessage } = useVIntl()
	const { handleError } = notificationManager
	const router = useRouter()

	const installationModal =
		useTemplateRef<ComponentExposed<typeof CreationFlowModal>>('installationModal')
	const unknownPackWarningModal =
		useTemplateRef<InstanceType<typeof UnknownPackWarningModal>>('unknownPackWarningModal')
	const modpackAlreadyInstalledModal = ref<InstanceType<typeof ModpackAlreadyInstalledModal>>()

	function setModpackAlreadyInstalledModal(
		modal: InstanceType<typeof ModpackAlreadyInstalledModal>,
	) {
		modpackAlreadyInstalledModal.value = modal
	}

	async function fetchExistingInstanceNames(): Promise<string[]> {
		const instances = await list().catch(handleError)
		return instances?.map((i) => i.name) ?? []
	}

	provide('showCreationModal', () => {
		installationModal.value?.show()
	})

	provide(
		'showCreationModalWithOptions',
		(options?: {
			skipSetupType?: boolean
			initialMode?: 'custom' | 'import'
			onBack?: () => void
		}) => {
			installationModal.value?.show(options)
		},
	)

	async function proceedWithModpackCreation(
		projectId: string,
		versionId: string,
		name: string,
		iconUrl?: string,
	) {
		await install_create_modpack_instance(
			{
				type: 'fromVersionId',
				project_id: projectId,
				version_id: versionId,
				title: name,
				icon_url: iconUrl,
			},
			{ name },
		).catch(handleError)
	}

	async function handleCreate(config: CreationFlowContextValue) {
		try {
			installationModal.value?.hide()

			if (config.isImportMode.value) {
				// Collect all instances to import
				const instanceEntries: Array<{
					launcherType: string
					launcherName: string
					path: string
					instanceName: string
					instancePath: string
				}> = []
				for (const [launcherName, instanceSet] of Object.entries(
					config.importSelectedInstances.value,
				)) {
					const launcher = config.importLaunchers.value.find((l) => l.name === launcherName)
					if (!launcher || instanceSet.size === 0) continue
					for (const name of instanceSet) {
						const instanceData = launcher.instances.find((i) => i.name === name)
						instanceEntries.push({
							launcherType: launcher.launcherType ?? launcher.name,
							launcherName: launcher.name,
							path: launcher.path,
							instanceName: name,
							instancePath: instanceData?.path ?? '',
						})
					}
				}

				if (instanceEntries.length === 0) return

				// Show SymlinkMethodCards for user to choose copy vs symlink
				const capability = await check_symlink_capability()
				if (capability === 'unsupported') {
					notificationManager.addNotification({
						type: 'error',
						title: formatMessage(symlinkMessages.unsupportedTitle),
						text: formatMessage(symlinkMessages.unsupportedBody),
					})
					return
				}

				const chooseImportMethod: (options: {
					instanceNames: string[]
					symlinkCapable: 'supported' | 'requires_admin' | 'unsupported'
				}) => Promise<SymlinkMethodChoice[]> = inject('chooseImportMethod')!

				const choices = await chooseImportMethod({
					instanceNames: instanceEntries.map((e) => e.instanceName),
					symlinkCapable: capability,
				})

				if (choices.length === 0) return

				const choiceByInstanceName = new Map(choices.map((choice) => [choice.instanceName, choice]))

				for (const entry of instanceEntries) {
					const choice = choiceByInstanceName.get(entry.instanceName)
					try {
						const job = await import_instance(
							entry.launcherType,
							entry.path,
							entry.instanceName,
							choice?.symlink ?? false,
							entry.instancePath,
							undefined,
							undefined,
							undefined,
							choice?.gameDirOverride ?? null,
						)
						await wait_for_install_job(job.job_id)
					} catch (error) {
						handleError(error)
					}
				}
				return
			}

			if (config.modpackSelection.value) {
				const { projectId, versionId, name, iconUrl } = config.modpackSelection.value
				await proceedWithModpackCreation(projectId, versionId, name, iconUrl)
				return
			}

			if (config.modpackFilePath.value) {
				// Fallback: called when modpack is imported via the creation flow
				// (not via onImportFileReceived, which has its own install path).
				const splitPath = config.modpackFilePath.value.split(/[\\/]/)
				const fileName = splitPath ? splitPath[splitPath.length - 1] : config.modpackFilePath.value
				await installModpackFromPath(config.modpackFilePath.value, fileName)
				return
			}

			// Custom/vanilla setup
			const loader = config.hideLoaderChips.value
				? 'vanilla'
				: (config.selectedLoader.value ?? 'vanilla')
			const loaderVersion = config.hideLoaderVersion.value
				? null
				: (config.selectedLoaderVersion.value ?? config.loaderVersionType.value)
			const iconPath = config.instanceIconPath.value ?? null
			const name = config.instanceName.value.trim() || config.autoInstanceName.value
			// Game directory: `gameDirOverride` holds the picked `.minecraft`
			// root. Builtin keeps the managed folder (null); external resolves to
			// `<root>/versions/<name>` when version-isolated, or the `.minecraft`
			// root itself when not.
			const mode = config.gameDirOverrideMode.value
			const gameRoot = config.gameDirOverride.value ?? null
			const gameDirOverride =
				mode === 'builtin'
					? null
					: gameRoot
						? mode === 'isolated'
							? await join(gameRoot, 'versions', name)
							: gameRoot
						: null

			await install_create_instance({
				name,
				gameVersion: config.selectedGameVersion.value!,
				loader: loader as InstanceLoader,
				loaderVersion,
				adjuncts: config.selectedAdjuncts.value.map((kind) => ({
					instanceId: '',
					kind,
					version: null,
					role: 'adjunct',
				})),
				iconPath,
				gameDirOverride,
			}).catch(handleError)

		} catch (err) {
			handleError(err as Error)
		}
	}

	const pendingModpackCreation = ref<{
		projectId: string
		versionId: string
		name: string
		iconUrl?: string
	} | null>(null)

	async function doInstallModpackFile(
		location: CreatePackLocation,
		options: { autoCloseMs?: number | null; existingNotify?: { id: number } } = {},
	) {
		const existingNotify = options.existingNotify
		const installingNotify =
			existingNotify ??
			notificationManager.addNotification({
				title: formatMessage(modpackMessages.installing),
				type: 'info',
				autoCloseMs: options.autoCloseMs ?? 1000 * 10,
			})

		const job = await install_create_modpack_instance(location).catch((e) => {
			notificationManager.removeNotification(installingNotify.id)
			handleError(e)
			return null
		})
		if (!job) return

		// Single-use listener that auto-cleans up when the job reaches a terminal state
		const unlisten = await install_job_listener((updatedJob: InstallJobSnapshot) => {
			if (updatedJob.job_id !== job.job_id) return

			if (updatedJob.status === 'succeeded') {
				notificationManager.removeNotification(installingNotify.id)
				notificationManager.addNotification({
					title: formatMessage(modpackMessages.installed),
					type: 'success',
				})
				unlisten()
			} else if (['failed', 'canceled', 'interrupted'].includes(updatedJob.status)) {
				notificationManager.removeNotification(installingNotify.id)
				unlisten()
			}
		})
	}

	async function handleModpackDuplicateCreateAnyway() {
		if (!pendingModpackCreation.value) return
		const { projectId, versionId, name, iconUrl } = pendingModpackCreation.value
		pendingModpackCreation.value = null
		await proceedWithModpackCreation(projectId, versionId, name, iconUrl)
	}

	function handleModpackDuplicateGoToInstance(instanceId: string) {
		pendingModpackCreation.value = null
		router.push(`/instance/${encodeURIComponent(instanceId)}/`)
	}

	function handleBrowseModpacks() {
		installationModal.value?.hide()
		router.push('/browse/modpack')
	}

	async function searchModpacks(query: string, limit: number = 10) {
		const params = [`facets=[["project_type:modpack"]]`, `limit=${limit}`]
		if (query) {
			params.push(`query=${encodeURIComponent(query)}`)
		}
		const raw = await get_search_results(`?${params.join('&')}`)
		if (raw?.result) return raw.result
		return { hits: [], offset: 0, limit, total_hits: 0 }
	}

	async function getProjectVersions(projectId: string) {
		const versions = await get_project_versions(projectId, 'must_revalidate')
		return versions ?? []
	}

	async function hasCompatibleOptiFabric(gameVersion: string) {
		const response = await getCurseForgeFiles(OPTIFABRIC_CURSEFORGE_PROJECT_ID, {
			index: 0,
			pageSize: 50,
		})
		return hasCompatibleCurseForgeFile(response.files, gameVersion)
	}

	let _currentFlowCtx: CreationFlowContextValue | null = null

	/** Install a modpack file with continuous feedback notifications. */
	async function installModpackFromPath(
		filePath: string,
		fileName: string,
		options: { persistUntilDone?: boolean } = {},
	) {
		const persistUntilDone = options.persistUntilDone === true
		const currentNotify = notificationManager.addNotification({
			title: formatMessage(modpackMessages.installingFile, { name: fileName }),
			type: 'info',
			autoCloseMs: persistUntilDone ? null : 1000 * 10,
		})

		const location: CreatePackLocation = { type: 'fromFile', path: filePath }

		try {
			const isMrpack = fileName?.toLowerCase().endsWith('.mrpack')

			if (!isMrpack) {
				// .zip needs preview to determine manifest
				const preview = await install_get_modpack_preview(location).catch((e) => {
					notificationManager.removeNotification(currentNotify.id)
					handleError(e)
					return null
				})
				if (!preview) return

				if (preview.unknownFile) {
					notificationManager.removeNotification(currentNotify.id)
					unknownPackWarningModal.value?.show(async () => {
						if (persistUntilDone) {
							const installingNotify = notificationManager.addNotification({
								title: formatMessage(modpackMessages.installing),
								type: 'info',
								autoCloseMs: null,
							})
							await doInstallModpackFile(location, { existingNotify: installingNotify })
						} else {
							await doInstallModpackFile(location)
						}
					}, fileName)
					return
				}
			}

			if (persistUntilDone) {
				await doInstallModpackFile(location, { existingNotify: currentNotify })
			} else {
				await doInstallModpackFile(location)
			}
		} catch (e) {
			notificationManager.removeNotification(currentNotify?.id)
			handleError(e as Error)
		}
	}

	provide('setCreationFlowCtx', (ctx: CreationFlowContextValue) => {
		_currentFlowCtx = ctx
	})

	return {
		installationModal,
		unknownPackWarningModal,
		fetchExistingInstanceNames,
		handleCreate,
		handleBrowseModpacks,
		searchModpacks,
		getProjectVersions,
		hasCompatibleOptiFabric,
		getLoaderManifest,
		installModpackFromPath,
		setModpackAlreadyInstalledModal,
		handleModpackDuplicateCreateAnyway,
		handleModpackDuplicateGoToInstance,
	}
}