import { LaEditorProps } from "@shared/editor"
import { Editor } from "@tiptap/core"

export function getOutput(editor: Editor, format: LaEditorProps["output"]) {
  if (format === "json") {
    return editor.getJSON()
  }

  if (format === "html") {
    return editor.getText() ? editor.getHTML() : ""
  }

  return editor.getText()
}

export type FileError = {
  file: File | string
  reason: "type" | "size" | "invalidBase64" | "base64NotAllowed"
}

export type FileValidationOptions = {
  allowedMimeTypes: string[]
  maxFileSize?: number
  allowBase64: boolean
}

type FileInput = File | { src: string | File; alt?: string; title?: string }

// URL validation and sanitization
export const isUrl = (
  text: string,
  options?: { requireHostname: boolean; allowBase64?: boolean },
): boolean => {
  if (text.match(/\n/)) return false

  try {
    const url = new URL(text)
    const blockedProtocols = [
      "javascript:",
      "file:",
      "vbscript:",
      ...(options?.allowBase64 ? [] : ["data:"]),
    ]

    if (blockedProtocols.includes(url.protocol)) return false
    if (options?.allowBase64 && url.protocol === "data:")
      return /^data:image\/[a-z]+;base64,/.test(text)
    if (url.hostname) return true

    return (
      url.protocol !== "" &&
      (url.pathname.startsWith("//") || url.pathname.startsWith("http")) &&
      !options?.requireHostname
    )
  } catch {
    return false
  }
}

export const sanitizeUrl = (
  url: string | null | undefined,
  options?: { allowBase64?: boolean },
): string | undefined => {
  if (!url) return undefined

  if (options?.allowBase64 && url.startsWith("data:image")) {
    return isUrl(url, { requireHostname: false, allowBase64: true })
      ? url
      : undefined
  }

  const isValidUrl = isUrl(url, {
    requireHostname: false,
    allowBase64: options?.allowBase64,
  })
  const isSpecialProtocol = /^(\/|#|mailto:|sms:|fax:|tel:)/.test(url)

  return isValidUrl || isSpecialProtocol ? url : `https://${url}`
}

// File handling
export async function blobUrlToBase64(blobUrl: string): Promise<string> {
  const response = await fetch(blobUrl)
  const blob = await response.blob()

  return new Promise((resolve, reject) => {
    const reader = new FileReader()
    reader.onloadend = () => {
      if (typeof reader.result === "string") {
        resolve(reader.result)
      } else {
        reject(new Error("Failed to convert Blob to base64"))
      }
    }
    reader.onerror = reject
    reader.readAsDataURL(blob)
  })
}

const validateFileOrBase64 = <T extends FileInput>(
  input: File | string,
  options: FileValidationOptions,
  originalFile: T,
  validFiles: T[],
  errors: FileError[],
) => {
  const { isValidType, isValidSize } = checkTypeAndSize(input, options)

  if (isValidType && isValidSize) {
    validFiles.push(originalFile)
  } else {
    if (!isValidType) errors.push({ file: input, reason: "type" })
    if (!isValidSize) errors.push({ file: input, reason: "size" })
  }
}

const checkTypeAndSize = (
  input: File | string,
  { allowedMimeTypes, maxFileSize }: FileValidationOptions,
) => {
  const mimeType = input instanceof File ? input.type : base64MimeType(input)
  const size =
    input instanceof File ? input.size : atob(input.split(",")[1]).length

  const isValidType =
    allowedMimeTypes.length === 0 ||
    allowedMimeTypes.includes(mimeType) ||
    allowedMimeTypes.includes(`${mimeType.split("/")[0]}/*`)

  const isValidSize = !maxFileSize || size <= maxFileSize

  return { isValidType, isValidSize }
}

const base64MimeType = (encoded: string): string => {
  const result = encoded.match(/data:([a-zA-Z0-9]+\/[a-zA-Z0-9-.+]+).*,.*/)
  return result && result.length ? result[1] : "unknown"
}

const isBase64 = (str: string): boolean => {
  if (str.startsWith("data:")) {
    const matches = str.match(/^data:[^;]+;base64,(.+)$/)
    if (matches && matches[1]) {
      str = matches[1]
    } else {
      return false
    }
  }

  try {
    atob(str)
    return true
  } catch {
    return false
  }
}

export const filterFiles = <T extends FileInput>(
  files: T[],
  options: FileValidationOptions,
): [T[], FileError[]] => {
  const validFiles: T[] = []
  const errors: FileError[] = []

  files.forEach((file) => {
    const actualFile = "src" in file ? file.src : file

    if (actualFile instanceof File) {
      validateFileOrBase64(actualFile, options, file, validFiles, errors)
    } else if (typeof actualFile === "string") {
      if (isBase64(actualFile)) {
        if (options.allowBase64) {
          validateFileOrBase64(actualFile, options, file, validFiles, errors)
        } else {
          errors.push({ file: actualFile, reason: "base64NotAllowed" })
        }
      } else {
        validFiles.push(file)
      }
    }
  })

  return [validFiles, errors]
}

export * from "./isTextSelected"