'use client'

import { useCallback, useEffect, useState } from 'react'

import Button from '@/components/formElements/Button'
import Input from '@/components/formElements/Input'
import Modal from '@/components/modals/Modal'
import { formatPersonName } from '@/helpers'
import { formatIranianMobile } from '@/lib/formatters'
import { getAdminUsers } from '@/api/generated/admin-users/admin-users'
import type { AdminUserListItemDto } from '@/api/generated/models'
import { unwrapApiPayload } from '@/helpers/listResponse'
import { texts } from '@/texts'

export interface VerifiedHostOption {
  id: string
  firstName: string | null
  lastName: string | null
  mobile: string
}

interface VerifiedHostPickerProps {
  selected: VerifiedHostOption | null
  onSelect: (host: VerifiedHostOption) => void
}

const adminUsersApi = getAdminUsers()

function toHostOption(row: AdminUserListItemDto): VerifiedHostOption {
  return {
    id: row.id,
    firstName: row.firstName,
    lastName: row.lastName,
    mobile: row.mobile,
  }
}

async function searchVerifiedHosts(query: string): Promise<VerifiedHostOption[]> {
  const trimmed = query.trim()
  const filters: Record<string, string> = { userType: 'host', identityStatus: 'verified' }

  if (trimmed) {
    if (/^\d+$/.test(trimmed)) {
      filters.mobile = trimmed
    } else if (trimmed.includes(' ')) {
      const [first, ...rest] = trimmed.split(/\s+/)

      filters.firstName = first
      filters.lastName = rest.join(' ')
    } else {
      filters.firstName = trimmed
    }
  }

  const response = await adminUsersApi.adminUsersControllerList({
    page: 1,
    pageSize: 20,
    sort: '-createdAt',
    filters,
  })
  const payload = unwrapApiPayload<{ items?: AdminUserListItemDto[] }>(response.data)
  const items = Array.isArray(payload.items) ? payload.items : []

  return items.map(toHostOption)
}

const VerifiedHostPicker = ({ selected, onSelect }: VerifiedHostPickerProps) => {
  const [isOpen, setIsOpen] = useState(false)
  const [query, setQuery] = useState('')
  const [results, setResults] = useState<VerifiedHostOption[]>([])
  const [isLoading, setIsLoading] = useState(false)
  const [error, setError] = useState<string | null>(null)

  const load = useCallback(async (nextQuery: string) => {
    try {
      setIsLoading(true)
      setError(null)
      setResults(await searchVerifiedHosts(nextQuery))
    } catch {
      setResults([])
      setError(texts.events.createEventHostSearchFailed)
    } finally {
      setIsLoading(false)
    }
  }, [])

  useEffect(() => {
    if (!isOpen) return

    const timer = window.setTimeout(() => {
      void load(query)
    }, 250)

    return () => {
      window.clearTimeout(timer)
    }
  }, [isOpen, load, query])

  const selectedLabel = selected
    ? `${formatPersonName(selected.firstName, selected.lastName)} · ${formatIranianMobile(selected.mobile)}`
    : texts.events.createEventHostPickerPlaceholder

  return (
    <>
      <Button
        fullWidth
        className="justify-start"
        variant="bordered"
        onClick={() => {
          setIsOpen(true)
        }}
      >
        {selectedLabel}
      </Button>

      <Modal
        acceptBtnText={texts.common.close}
        isOpen={isOpen}
        size="2xl"
        title={texts.events.createEventHostPickerLabel}
        onAccept={() => {
          setIsOpen(false)
        }}
        onOpenChange={setIsOpen}
      >
        <div className="grid gap-3">
          <Input
            generalType="input"
            label={texts.events.createEventHostSearchPlaceholder}
            name="verifiedHostSearch"
            value={query}
            onValueChange={(value) => {
              setQuery(typeof value === 'string' ? value : '')
            }}
          />

          {error ? <p className="text-sm text-fourth-900">{error}</p> : null}
          {isLoading ? <p className="text-sm text-secondary-20">{texts.common.loadingList}</p> : null}

          {!isLoading && !error && results.length === 0 ? (
            <p className="text-sm text-secondary-20">{texts.events.createEventHostSearchEmpty}</p>
          ) : null}

          <ul className="max-h-80 divide-y divide-secondary-40 overflow-y-auto rounded-xl border border-secondary-40">
            {results.map((host) => (
              <li key={host.id}>
                <Button
                  className="h-auto w-full flex-col items-stretch gap-1 rounded-none p-3 text-right"
                  variant="light"
                  onClick={() => {
                    onSelect(host)
                    setIsOpen(false)
                  }}
                >
                  <span className="text-sm font-semibold text-secondary-10">{formatPersonName(host.firstName, host.lastName)}</span>
                  <span
                    className="text-xs text-secondary-20"
                    dir="ltr"
                  >
                    {formatIranianMobile(host.mobile)}
                  </span>
                </Button>
              </li>
            ))}
          </ul>
        </div>
      </Modal>
    </>
  )
}

export default VerifiedHostPicker