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

import Image from 'next/image'

import {
  EngineStatus,
  LlmEngine,
  LocalEngine,
  Model,
  RemoteEngine,
  RemoteEngines,
} from '@janhq/core'

import { Button } from '@janhq/joi'
import { useAtom, useSetAtom } from 'jotai'
import {
  SettingsIcon,
  ChevronDownIcon,
  ChevronUpIcon,
  PlusIcon,
} from 'lucide-react'

import { twMerge } from 'tailwind-merge'

import useEngineQuery from '@/hooks/useEngineQuery'
import useGetModelsByEngine from '@/hooks/useGetModelsByEngine'

import {
  getLogoByLocalEngine,
  getLogoByRemoteEngine,
  getTitleByCategory,
} from '@/utils/model-engine'

import ModelLabel from '../ModelLabel'

import { showEngineListModelAtom } from '@/helpers/atoms/Model.atom'
import { setUpRemoteModelStageAtom } from '@/helpers/atoms/SetupRemoteModel.atom'

type Props = {
  engine: LlmEngine
  searchText: string
  onModelSelected: (model: Model) => void
}

const ModelSection: React.FC<Props> = ({
  engine,
  searchText,
  onModelSelected,
}) => {
  const [models, setModels] = useState<Model[]>([])
  const { getModelsByEngine } = useGetModelsByEngine()
  const setUpRemoteModelStage = useSetAtom(setUpRemoteModelStageAtom)
  const { data: engineData } = useEngineQuery()

  const [showEngineListModel, setShowEngineListModel] = useAtom(
    showEngineListModelAtom
  )

  const engineLogo: string | undefined = models.find(
    (entry) => entry?.metadata?.logo != null
  )?.metadata?.logo

  const apiKeyUrl: string | undefined = models.find(
    (entry) => entry?.metadata?.api_key_url != null
  )?.metadata?.api_key_url

  const onSettingClick = useCallback(() => {
    setUpRemoteModelStage('SETUP_API_KEY', engine as unknown as RemoteEngine, {
      logo: engineLogo,
      api_key_url: apiKeyUrl,
    })
  }, [apiKeyUrl, engine, engineLogo, setUpRemoteModelStage])

  const isEngineReady =
    engineData?.find((e) => e.name === engine)?.status === EngineStatus.Ready

  const getEngineStatusReady: LlmEngine[] | undefined = engineData
    ?.filter((e) => e.status === EngineStatus.Ready)
    .map((x) => x.name as LlmEngine)

  const showModel = showEngineListModel.includes(engine)

  const onClickChevron = useCallback(() => {
    if (showModel) {
      setShowEngineListModel((prev) => prev.filter((item) => item !== engine))
    } else {
      setShowEngineListModel((prev) => [...prev, engine])
    }
  }, [engine, setShowEngineListModel, showModel])

  useEffect(() => {
    const matchedModels = getModelsByEngine(engine, searchText)
    setModels(matchedModels)
    setShowEngineListModel((prev) => [
      ...prev,
      ...(getEngineStatusReady as LlmEngine[]),
    ])
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [getModelsByEngine, engine, searchText, setShowEngineListModel])

  const engineName = getTitleByCategory(engine)
  const localEngineLogo = getLogoByLocalEngine(engine as LocalEngine)
  const remoteEngineLogo = getLogoByRemoteEngine(engine as RemoteEngine)
  const isRemoteEngine = RemoteEngines.includes(engine as RemoteEngine)

  if (models.length === 0) return null

  return (
    <div className="w-full border-b border-[hsla(var(--app-border))] py-3 last:border-none">
      <div className="flex justify-between pr-2">
        <div
          className="flex cursor-pointer gap-2 pl-3"
          onClick={onClickChevron}
        >
          {!isRemoteEngine && localEngineLogo && (
            <Image
              className="h-5 w-5 flex-shrink-0 rounded-full object-cover"
              width={40}
              height={40}
              src={localEngineLogo}
              alt="logo"
            />
          )}

          {remoteEngineLogo && (
            <Image
              className="h-5 w-5 flex-shrink-0 rounded-full object-cover"
              width={40}
              height={40}
              src={remoteEngineLogo}
              alt={`logo - ${engine}`}
            />
          )}
          <h6 className="pr-3 font-medium text-[hsla(var(--text-secondary))]">
            {engineName}
          </h6>
        </div>
        <div className="flex items-center gap-x-0.5">
          {isRemoteEngine && (
            <Button theme="icon" variant="outline" onClick={onSettingClick}>
              {isEngineReady ? (
                <SettingsIcon
                  size={14}
                  className="text-[hsla(var(--text-secondary))]"
                />
              ) : (
                <PlusIcon
                  size={14}
                  className="text-[hsla(var(--text-secondary))]"
                />
              )}
            </Button>
          )}
          {!showModel ? (
            <Button theme="icon" onClick={onClickChevron}>
              <ChevronDownIcon
                size={14}
                className="text-[hsla(var(--text-secondary))]"
              />
            </Button>
          ) : (
            <Button theme="icon" onClick={onClickChevron}>
              <ChevronUpIcon
                size={14}
                className="text-[hsla(var(--text-secondary))]"
              />
            </Button>
          )}
        </div>
      </div>
      <ul>
        {models.map((model) => {
          if (!showModel) return null
          return (
            <li
              key={model.model}
              className={twMerge(
                'flex cursor-pointer items-center gap-2 px-3 py-2 hover:bg-[hsla(var(--dropdown-menu-hover-bg))]',
                !isRemoteEngine || isEngineReady
                  ? 'text-[hsla(var(--text-secondary))]'
                  : 'pointer-events-none cursor-not-allowed text-[hsla(var(--text-tertiary))]'
              )}
              onClick={() => {
                onModelSelected(model)
              }}
            >
              <div className="flex w-full items-center justify-between">
                <p className="line-clamp-1">{model.name ?? model.model}</p>
              </div>
              <ModelLabel metadata={model.metadata} compact />
            </li>
          )
        })}
      </ul>
    </div>
  )
}

export default ModelSection