import { v } from "convex/values"
import type { Doc, Id } from "../_generated/dataModel"
import type { AuthenticatedMutationCtx } from "../functions"
import * as Directories from "./directories"
import * as Files from "./files"

export enum FileType {
	File = "File",
	Directory = "Directory",
}

export type Directory = {
	kind: FileType.Directory
	doc: Doc<"directories">
}
export type File = {
	kind: FileType.File
	doc: Doc<"files">
}
export type FileSystemItem = Directory | File

export type DirectoryPathComponent = {
	handle: DirectoryHandle
	name: string
}

export type FilePathComponent = {
	handle: FileHandle
	name: string
}
export type PathComponent = FilePathComponent | DirectoryPathComponent
export type FilePath = [...DirectoryPathComponent[], PathComponent]
export type ReverseFilePath = [PathComponent, ...DirectoryPathComponent[]]

export type DirectoryHandle = {
	kind: FileType.Directory
	id: Id<"directories">
}
export type FileHandle = {
	kind: FileType.File
	id: Id<"files">
}
export type FileSystemHandle = DirectoryHandle | FileHandle

export function newFileSystemHandle(item: FileSystemItem): FileSystemHandle {
	console.log("item", item)
	switch (item.kind) {
		case FileType.File:
			return { kind: item.kind, id: item.doc._id }
		case FileType.Directory:
			return { kind: item.kind, id: item.doc._id }
	}
}

export function isSameHandle(
	handle1: FileSystemHandle,
	handle2: FileSystemHandle,
): boolean {
	return handle1.kind === handle2.kind && handle1.id === handle2.id
}

export function newDirectoryHandle(id: Id<"directories">): DirectoryHandle {
	return { kind: FileType.Directory, id }
}

export function newFileHandle(id: Id<"files">): FileHandle {
	return { kind: FileType.File, id }
}

export const VDirectoryHandle = v.object({
	kind: v.literal(FileType.Directory),
	id: v.id("directories"),
})
export const VFileHandle = v.object({
	kind: v.literal(FileType.File),
	id: v.id("files"),
})
export const VFileSystemHandle = v.union(VFileHandle, VDirectoryHandle)

export async function deleteItemsPermanently(
	ctx: AuthenticatedMutationCtx,
	{ handles }: { handles: FileSystemHandle[] },
) {
	// Collect all items to delete (including nested items)
	const fileHandlesToDelete: FileHandle[] = []
	const directoryHandlesToDelete: DirectoryHandle[] = []

	// Process each handle to collect files and directories
	for (const handle of handles) {
		// Use a queue to process items iteratively instead of recursively
		const queue: FileSystemHandle[] = [handle]

		while (queue.length > 0) {
			const currentHandle = queue.shift()!

			// Add current item to appropriate deletion collection
			if (currentHandle.kind === FileType.File) {
				fileHandlesToDelete.push(currentHandle)
			} else {
				directoryHandlesToDelete.push(currentHandle)
			}

			// If it's a directory, collect all children and add them to the queue
			if (currentHandle.kind === FileType.Directory) {
				// Get all child directories that are in trash (deletedAt > 0)
				const childDirectories = await ctx.db
					.query("directories")
					.withIndex("byParentId", (q) =>
						q
							.eq("userId", ctx.user._id)
							.eq("parentId", currentHandle.id)
							.gte("deletedAt", 0),
					)
					.collect()

				// Get all child files that are in trash (deletedAt > 0)
				const childFiles = await ctx.db
					.query("files")
					.withIndex("byDirectoryId", (q) =>
						q
							.eq("userId", ctx.user._id)
							.eq("directoryId", currentHandle.id)
							.gte("deletedAt", 0),
					)
					.collect()

				// Add child directories to queue for processing
				for (const childDir of childDirectories) {
					const childHandle = newDirectoryHandle(childDir._id)
					queue.push(childHandle)
				}

				// Add child files to file handles collection
				for (const childFile of childFiles) {
					const childFileHandle = newFileHandle(childFile._id)
					fileHandlesToDelete.push(childFileHandle)
				}
			}
		}
	}

	// Delete files and directories using their respective models
	const [filesResult, directoriesResult] = await Promise.all([
		Files.deletePermanently(ctx, { items: fileHandlesToDelete }),
		Directories.deletePermanently(ctx, { items: directoryHandlesToDelete }),
	])

	// Combine results, handling null responses
	return {
		deleted: {
			files: filesResult?.deleted || 0,
			directories: directoriesResult?.deleted || 0,
		},
		errors: [
			...(filesResult?.errors || []),
			...(directoriesResult?.errors || []),
		],
	}
}