import _ from 'lodash'
import { Event, kinds, nip19, UnsignedEvent } from 'nostr-tools'
import Papa from 'papaparse'
import React, { useCallback, useEffect, useMemo, useRef, useState } from 'react'
import { toast } from 'react-toastify'
import { FixedSizeList as List } from 'react-window'
import { v4 as uuidv4 } from 'uuid'
import { useAppSelector } from '../hooks'
import '../styles/styles.css'
import {
  isReachable,
  isValidImageUrl,
  isValidUrl,
  log,
  LogType,
  now
} from '../utils'
import { CheckboxField, InputError, InputField } from './Inputs'
import { RelayController } from '../controllers'
import { useNavigate } from 'react-router-dom'
import { getModsInnerPageRoute } from '../routes'
import { DownloadUrl, FormState } from '../types'
import { LoadingSpinner } from './LoadingSpinner'

interface FormErrors {
  game?: string
  title?: string
  body?: string
  featuredImageUrl?: string
  summary?: string
  nsfw?: string
  screenshotsUrls?: string[]
  tags?: string
  downloadUrls?: string[]
}

interface GameOption {
  value: string
  label: string
}

let processedCSV = false

export const ModForm = () => {
  const navigate = useNavigate()
  const userState = useAppSelector((state) => state.user)

  const [isPublishing, setIsPublishing] = useState(false)
  const [gameOptions, setGameOptions] = useState<GameOption[]>([])
  const [formState, setFormState] = useState<FormState>({
    game: '',
    title: '',
    body: '',
    featuredImageUrl: '',
    summary: '',
    nsfw: false,
    screenshotsUrls: [''],
    tags: '',
    downloadUrls: [
      {
        url: '',
        hash: '',
        signatureKey: '',
        malwareScanLink: '',
        modVersion: '',
        customNote: ''
      }
    ]
  })
  const [formErrors, setFormErrors] = useState<FormErrors>({})

  useEffect(() => {
    if (processedCSV) return
    processedCSV = true

    // Fetch the CSV file from the public folder
    fetch('/assets/games.csv')
      .then((response) => response.text())
      .then((csvText) => {
        // Parse the CSV text using PapaParse
        Papa.parse<{
          'Game Name': string
          '16 by 9 image': string
          'Boxart image': string
        }>(csvText, {
          worker: true,
          header: true,
          complete: (results) => {
            const options = results.data.map((row) => ({
              label: row['Game Name'],
              value: row['Game Name']
            }))
            setGameOptions(options)
          }
        })
      })
      .catch((error) => console.error('Error fetching CSV file:', error))
  }, [])

  const handleInputChange = useCallback((name: string, value: string) => {
    setFormState((prevState) => ({
      ...prevState,
      [name]: value
    }))
  }, [])

  const handleCheckboxChange = useCallback(
    (e: React.ChangeEvent<HTMLInputElement>) => {
      const { name, checked } = e.target
      setFormState((prevState) => ({
        ...prevState,
        [name]: checked
      }))
    },
    []
  )

  const addScreenshotUrl = useCallback(() => {
    setFormState((prevState) => ({
      ...prevState,
      screenshotsUrls: [...prevState.screenshotsUrls, '']
    }))
  }, [])

  const removeScreenshotUrl = useCallback((index: number) => {
    setFormState((prevState) => ({
      ...prevState,
      screenshotsUrls: prevState.screenshotsUrls.filter((_, i) => i !== index)
    }))
  }, [])

  const handleScreenshotUrlChange = useCallback(
    (index: number, value: string) => {
      setFormState((prevState) => ({
        ...prevState,
        screenshotsUrls: [
          ...prevState.screenshotsUrls.map((url, i) => {
            if (index === i) return value
            return url
          })
        ]
      }))
    },
    []
  )

  const addDownloadUrl = useCallback(() => {
    setFormState((prevState) => ({
      ...prevState,
      downloadUrls: [
        ...prevState.downloadUrls,
        {
          url: '',
          hash: '',
          signatureKey: '',
          malwareScanLink: '',
          modVersion: '',
          customNote: ''
        }
      ]
    }))
  }, [])

  const removeDownloadUrl = useCallback((index: number) => {
    setFormState((prevState) => ({
      ...prevState,
      downloadUrls: prevState.downloadUrls.filter((_, i) => i !== index)
    }))
  }, [])

  const handleDownloadUrlChange = useCallback(
    (index: number, field: keyof DownloadUrl, value: string) => {
      setFormState((prevState) => ({
        ...prevState,
        downloadUrls: [
          ...prevState.downloadUrls.map((url, i) => {
            if (index === i) url[field] = value
            return url
          })
        ]
      }))
    },
    []
  )

  const handlePublish = async () => {
    setIsPublishing(true)

    let hexPubkey: string

    if (userState.isAuth && userState.user?.pubkey) {
      hexPubkey = userState.user.pubkey as string
    } else {
      hexPubkey = (await window.nostr?.getPublicKey()) as string
    }

    if (!hexPubkey) {
      toast.error('Could not get pubkey')
      return
    }

    if (!(await validateState())) {
      setIsPublishing(false)
      return
    }

    const uuid = uuidv4()
    const currentTimeStamp = now()

    const unsignedEvent: UnsignedEvent = {
      kind: kinds.ClassifiedListing,
      created_at: currentTimeStamp,
      pubkey: hexPubkey,
      content: formState.body,
      tags: [
        ['d', uuid],
        ['t', window.location.host],
        ['published_at', currentTimeStamp.toString()],
        ['game', formState.game],
        ['title', formState.title],
        ['featuredImageUrl', formState.featuredImageUrl],
        ['summary', formState.summary],
        ['nsfw', formState.nsfw.toString()],
        ['screenshotsUrls', ...formState.screenshotsUrls],
        ['tags', ...formState.tags.split(',')],
        [
          'downloadUrls',
          ...formState.downloadUrls.map((downloadUrl) =>
            JSON.stringify(downloadUrl)
          )
        ]
      ]
    }

    const signedEvent = await window.nostr
      ?.signEvent(unsignedEvent)
      .then((event) => event as Event)
      .catch((err) => {
        toast.error('Failed to sign the event!')
        log(true, LogType.Error, 'Failed to sign the event!', err)
        return null
      })

    if (!signedEvent) {
      setIsPublishing(false)
      return
    }

    const publishedOnRelays = await RelayController.getInstance().publish(
      signedEvent as Event
    )

    // Handle cases where publishing failed or succeeded
    if (publishedOnRelays.length === 0) {
      toast.error('Failed to publish event on any relay')
    } else {
      toast.success(
        `Event published successfully to the following relays\n\n${publishedOnRelays.join(
          '\n'
        )}`
      )

      const nevent = nip19.neventEncode({
        id: signedEvent.id,
        author: signedEvent.pubkey,
        kind: signedEvent.kind,
        relays: publishedOnRelays
      })

      navigate(getModsInnerPageRoute(nevent))
    }

    setIsPublishing(false)
  }

  const validateState = async (): Promise<boolean> => {
    const errors: FormErrors = {}

    if (formState.game === '') {
      errors.game = 'Game field can not be empty'
    }

    if (formState.title === '') {
      errors.title = 'Title field can not be empty'
    }

    if (formState.body === '') {
      errors.body = 'Body field can not be empty'
    }

    if (formState.featuredImageUrl === '') {
      errors.featuredImageUrl = 'FeaturedImageUrl field can not be empty'
    } else if (
      !isValidImageUrl(formState.featuredImageUrl) ||
      !(await isReachable(formState.featuredImageUrl))
    ) {
      errors.featuredImageUrl =
        'FeaturedImageUrl must be a valid and reachable image URL'
    }

    if (formState.summary === '') {
      errors.summary = 'Summary field can not be empty'
    }

    if (formState.screenshotsUrls.length === 0) {
      errors.screenshotsUrls = ['Required at least one screenshot url']
    } else {
      for (let i = 0; i < formState.screenshotsUrls.length; i++) {
        const url = formState.screenshotsUrls[i]
        if (
          !isValidUrl(url) ||
          !isValidImageUrl(url) ||
          !(await isReachable(url))
        ) {
          if (!errors.screenshotsUrls)
            errors.screenshotsUrls = Array(formState.screenshotsUrls.length)

          errors.screenshotsUrls![i] =
            'All screenshot URLs must be valid and reachable image URLs'
        }
      }
    }

    if (formState.tags === '') {
      errors.tags = 'Tags field can not be empty'
    }

    if (formState.downloadUrls.length === 0) {
      errors.downloadUrls = ['Required at least one download url']
    } else {
      for (let i = 0; i < formState.downloadUrls.length; i++) {
        const downloadUrl = formState.downloadUrls[i]
        if (
          !isValidUrl(downloadUrl.url) ||
          !(await isReachable(downloadUrl.url))
        ) {
          if (!errors.downloadUrls)
            errors.downloadUrls = Array(formState.downloadUrls.length)

          errors.downloadUrls![i] = 'Download url must be valid and reachable'
        }
      }
    }

    setFormErrors(errors)

    return Object.keys(errors).length === 0
  }

  return (
    <>
      {isPublishing && <LoadingSpinner desc='Publishing mod to relays' />}
      <GameDropdown
        options={gameOptions}
        selected={formState.game}
        error={formErrors.game}
        onChange={handleInputChange}
      />

      <InputField
        label='Title'
        placeholder='Return the banana mod'
        name='title'
        value={formState.title}
        error={formErrors.title}
        onChange={handleInputChange}
      />

      <InputField
        label='Body'
        type='richtext'
        placeholder="Here's what this mod is all about"
        name='body'
        value={formState.body}
        error={formErrors.body}
        onChange={handleInputChange}
      />

      <InputField
        label='Featured Image URL'
        description='We recommend to upload images to https://nostr.build/'
        type='text'
        inputMode='url'
        placeholder='Image URL'
        name='featuredImageUrl'
        value={formState.featuredImageUrl}
        error={formErrors.featuredImageUrl}
        onChange={handleInputChange}
      />
      <InputField
        label='Summary'
        type='textarea'
        placeholder='This is a quick description of my mod'
        name='summary'
        value={formState.summary}
        error={formErrors.summary}
        onChange={handleInputChange}
      />
      <CheckboxField
        label='This mod not safe for work (NSFW)'
        name='nsfw'
        isChecked={formState.nsfw}
        handleChange={handleCheckboxChange}
      />
      <div className='inputLabelWrapperMain'>
        <div className='labelWrapperMain'>
          <label className='form-label labelMain'>Screenshots URLs</label>
          <button
            className='btn btnMain btnMainAdd'
            type='button'
            onClick={addScreenshotUrl}
          >
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-32 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z'></path>
            </svg>
          </button>
        </div>
        <p className='labelDescriptionMain'>
          We recommend to upload images to https://nostr.build/
        </p>
        {formState.screenshotsUrls.map((url, index) => (
          <>
            <ScreenshotUrlFields
              key={index}
              index={index}
              url={url}
              onUrlChange={handleScreenshotUrlChange}
              onRemove={removeScreenshotUrl}
            />
            {formErrors.screenshotsUrls &&
              formErrors.screenshotsUrls[index] && (
                <InputError message={formErrors.screenshotsUrls[index]} />
              )}
          </>
        ))}
        {formState.screenshotsUrls.length === 0 &&
          formErrors.screenshotsUrls &&
          formErrors.screenshotsUrls[0] && (
            <InputError message={formErrors.screenshotsUrls[0]} />
          )}
      </div>
      <InputField
        label='Tags'
        description='Separate each tag with a comma. (Example: tag1, tag2, tag3)'
        placeholder='Tags'
        name='tags'
        value={formState.tags}
        error={formErrors.tags}
        onChange={handleInputChange}
      />
      <div className='inputLabelWrapperMain'>
        <div className='labelWrapperMain'>
          <label className='form-label labelMain'>Download URLs</label>
          <button
            className='btn btnMain btnMainAdd'
            type='button'
            onClick={addDownloadUrl}
          >
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-32 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M432 256c0 17.69-14.33 32.01-32 32.01H256v144c0 17.69-14.33 31.99-32 31.99s-32-14.3-32-31.99v-144H48c-17.67 0-32-14.32-32-32.01s14.33-31.99 32-31.99H192v-144c0-17.69 14.33-32.01 32-32.01s32 14.32 32 32.01v144h144C417.7 224 432 238.3 432 256z'></path>
            </svg>
          </button>
        </div>
        <p className='labelDescriptionMain'>
          You can upload your game mod to Github, as an example, and keep
          updating it there. Also, it's advisable that you hash your package as
          well with your nostr public key.
        </p>

        {formState.downloadUrls.map((download, index) => (
          <>
            <DownloadUrlFields
              key={index}
              index={index}
              url={download.url}
              hash={download.hash}
              signatureKey={download.signatureKey}
              malwareScanLink={download.malwareScanLink}
              modVersion={download.modVersion}
              customNote={download.customNote}
              onUrlChange={handleDownloadUrlChange}
              onRemove={removeDownloadUrl}
            />
            {formErrors.downloadUrls && formErrors.downloadUrls[index] && (
              <InputError message={formErrors.downloadUrls[index]} />
            )}
          </>
        ))}

        {formState.downloadUrls.length === 0 &&
          formErrors.downloadUrls &&
          formErrors.downloadUrls[0] && (
            <InputError message={formErrors.downloadUrls[0]} />
          )}
      </div>
      <div className='IBMSMSMBS_WriteAction'>
        <button
          className='btn btnMain'
          type='button'
          onClick={handlePublish}
          disabled={isPublishing}
        >
          Publish
        </button>
      </div>
    </>
  )
}
type DownloadUrlFieldsProps = {
  index: number
  url: string
  hash: string
  signatureKey: string
  malwareScanLink: string
  modVersion: string
  customNote: string
  onUrlChange: (index: number, field: keyof DownloadUrl, value: string) => void
  onRemove: (index: number) => void
}

const DownloadUrlFields = React.memo(
  ({
    index,
    url,
    hash,
    signatureKey,
    malwareScanLink,
    modVersion,
    customNote,
    onUrlChange,
    onRemove
  }: DownloadUrlFieldsProps) => {
    const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
      const { name, value } = e.target
      onUrlChange(index, name as keyof DownloadUrl, value)
    }

    return (
      <div className='inputWrapperMainWrapper'>
        <div className='inputWrapperMain'>
          <input
            type='text'
            className='inputMain'
            name='url'
            placeholder='Download URL'
            value={url}
            onChange={handleChange}
          />

          <button
            className='btn btnMain btnMainRemove'
            type='button'
            onClick={() => onRemove(index)}
          >
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-32 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M135.2 17.69C140.6 6.848 151.7 0 163.8 0H284.2C296.3 0 307.4 6.848 312.8 17.69L320 32H416C433.7 32 448 46.33 448 64C448 81.67 433.7 96 416 96H32C14.33 96 0 81.67 0 64C0 46.33 14.33 32 32 32H128L135.2 17.69zM394.8 466.1C393.2 492.3 372.3 512 346.9 512H101.1C75.75 512 54.77 492.3 53.19 466.1L31.1 128H416L394.8 466.1z'></path>
            </svg>
          </button>
        </div>
        <div className='inputWrapperMain'>
          <div className='inputWrapperMainBox'>
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-96 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M320 448c0 17.67-14.31 32-32 32H64c-17.69 0-32-14.33-32-32v-384C32 46.34 46.31 32.01 64 32.01S96 46.34 96 64.01v352h192C305.7 416 320 430.3 320 448z'></path>
            </svg>
          </div>
          <input
            type='text'
            className='inputMain'
            name='hash'
            placeholder='SHA-256 Hash'
            value={hash}
            onChange={handleChange}
          />
          <div className='inputWrapperMainBox'></div>
        </div>
        <div className='inputWrapperMain'>
          <div className='inputWrapperMainBox'>
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-96 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M320 448c0 17.67-14.31 32-32 32H64c-17.69 0-32-14.33-32-32v-384C32 46.34 46.31 32.01 64 32.01S96 46.34 96 64.01v352h192C305.7 416 320 430.3 320 448z'></path>
            </svg>
          </div>
          <input
            type='text'
            className='inputMain'
            placeholder='Signature public key'
            name='signatureKey'
            value={signatureKey}
            onChange={handleChange}
          />
          <div className='inputWrapperMainBox'></div>
        </div>
        <div className='inputWrapperMain'>
          <div className='inputWrapperMainBox'>
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-96 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M320 448c0 17.67-14.31 32-32 32H64c-17.69 0-32-14.33-32-32v-384C32 46.34 46.31 32.01 64 32.01S96 46.34 96 64.01v352h192C305.7 416 320 430.3 320 448z'></path>
            </svg>
          </div>
          <input
            type='text'
            className='inputMain'
            name='malwareScanLink'
            placeholder='Malware Scan Link'
            value={malwareScanLink}
            onChange={handleChange}
          />
          <div className='inputWrapperMainBox'></div>
        </div>
        <div className='inputWrapperMain'>
          <div className='inputWrapperMainBox'>
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-96 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M320 448c0 17.67-14.31 32-32 32H64c-17.69 0-32-14.33-32-32v-384C32 46.34 46.31 32.01 64 32.01S96 46.34 96 64.01v352h192C305.7 416 320 430.3 320 448z'></path>
            </svg>
          </div>
          <input
            type='text'
            className='inputMain'
            placeholder='Mod version (1.0)'
            name='modVersion'
            value={modVersion}
            onChange={handleChange}
          />
          <div className='inputWrapperMainBox'></div>
        </div>
        <div className='inputWrapperMain'>
          <div className='inputWrapperMainBox'>
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='-96 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M320 448c0 17.67-14.31 32-32 32H64c-17.69 0-32-14.33-32-32v-384C32 46.34 46.31 32.01 64 32.01S96 46.34 96 64.01v352h192C305.7 416 320 430.3 320 448z'></path>
            </svg>
          </div>
          <input
            type='text'
            className='inputMain'
            placeholder='Custom note/message'
            name='customNote'
            value={customNote}
            onChange={handleChange}
          />
          <div className='inputWrapperMainBox'></div>
        </div>
      </div>
    )
  }
)

type ScreenshotUrlFieldsProps = {
  index: number
  url: string
  onUrlChange: (index: number, value: string) => void
  onRemove: (index: number) => void
}

const ScreenshotUrlFields = React.memo(
  ({ index, url, onUrlChange, onRemove }: ScreenshotUrlFieldsProps) => {
    const handleChange = (e: React.ChangeEvent<HTMLInputElement>) => {
      onUrlChange(index, e.target.value)
    }

    return (
      <div className='inputWrapperMain'>
        <input
          type='text'
          className='inputMain'
          inputMode='url'
          placeholder='We recommend to upload images to https://nostr.build/'
          value={url}
          onChange={handleChange}
        />
        <button
          className='btn btnMain btnMainRemove'
          type='button'
          onClick={() => onRemove(index)}
        >
          <svg
            xmlns='http://www.w3.org/2000/svg'
            viewBox='-32 0 512 512'
            width='1em'
            height='1em'
            fill='currentColor'
          >
            <path d='M323.3 32.01H188.7C172.3 32.01 160 44.31 160 60.73V96.01H32C14.33 96.01 0 110.3 0 128S14.33 160 32 160H480c17.67 0 32-14.33 32-32.01S497.7 96.01 480 96.01H352v-35.28C352 44.31 339.7 32.01 323.3 32.01zM64.9 477.5C66.5 492.3 79.31 504 94.72 504H417.3c15.41 0 28.22-11.72 29.81-26.5L480 192.2H32L64.9 477.5z'></path>
          </svg>
        </button>
      </div>
    )
  }
)

type GameDropdownProps = {
  options: GameOption[]
  selected: string
  error?: string
  onChange: (name: string, value: string) => void
}

const GameDropdown = ({
  options,
  selected,
  error,
  onChange
}: GameDropdownProps) => {
  const [searchTerm, setSearchTerm] = useState('')
  const [debouncedSearchTerm, setDebouncedSearchTerm] = useState('')
  const inputRef = useRef<HTMLInputElement>(null)
  const isOptionClicked = useRef(false)

  const handleSearchChange = useCallback((value: string) => {
    setSearchTerm(value)
    _.debounce(() => {
      setDebouncedSearchTerm(value)
    }, 300)()
  }, [])

  const filteredOptions = useMemo(() => {
    if (debouncedSearchTerm === '') return []
    else {
      return options.filter((option) =>
        option.label.toLowerCase().includes(debouncedSearchTerm.toLowerCase())
      )
    }
  }, [debouncedSearchTerm, options])

  return (
    <div className='inputLabelWrapperMain'>
      <label className='form-label labelMain'>Game</label>
      <p className='labelDescriptionMain'>
        Can't find the game you're looking for? Send us a DM mentioning it so we
        can add it.
      </p>
      <div className='dropdown dropdownMain'>
        <div className='inputWrapperMain'>
          <input
            ref={inputRef}
            type='text'
            className='inputMain inputMainWithBtn dropdown-toggle'
            placeholder='This mod is for a game called...'
            aria-expanded='false'
            data-bs-toggle='dropdown'
            value={searchTerm || selected}
            onChange={(e) => handleSearchChange(e.target.value)}
            onBlur={() => {
              if (!isOptionClicked.current) {
                setSearchTerm('')
              }
              isOptionClicked.current = false
            }}
          />
          <button
            className='btn btnMain btnMainInsideField btnMainRemove'
            type='button'
            onClick={() => onChange('game', '')}
          >
            <svg
              xmlns='http://www.w3.org/2000/svg'
              viewBox='0 0 512 512'
              width='1em'
              height='1em'
              fill='currentColor'
            >
              <path d='M480 416C497.7 416 512 430.3 512 448C512 465.7 497.7 480 480 480H150.6C133.7 480 117.4 473.3 105.4 461.3L25.37 381.3C.3786 356.3 .3786 315.7 25.37 290.7L258.7 57.37C283.7 32.38 324.3 32.38 349.3 57.37L486.6 194.7C511.6 219.7 511.6 260.3 486.6 285.3L355.9 416H480zM265.4 416L332.7 348.7L195.3 211.3L70.63 336L150.6 416L265.4 416z'></path>
            </svg>
          </button>
          <div className='dropdown-menu dropdownMainMenu'>
            <List
              height={500}
              width={'100%'}
              itemCount={filteredOptions.length}
              itemSize={35}
            >
              {({ index, style }) => (
                <div
                  style={style}
                  className='dropdown-item dropdownMainMenuItem'
                  onMouseDown={() => (isOptionClicked.current = true)}
                  onClick={() => {
                    onChange('game', filteredOptions[index].value)
                    setSearchTerm('')
                    if (inputRef.current) {
                      inputRef.current.blur()
                    }
                  }}
                >
                  {filteredOptions[index].label}
                </div>
              )}
            </List>
          </div>
        </div>
      </div>
      {error && <InputError message={error} />}
    </div>
  )
}