import { Combobox } from "@kobalte/core/combobox"
import { For, Show, createEffect, createMemo } from "solid-js"
import { providers, fetchProviders } from "../stores/sessions"
import { ChevronDown } from "lucide-solid"
import type { Provider, Model } from "../types/session"
import Kbd from "./kbd"

interface ModelSelectorProps {
  instanceId: string
  sessionId: string
  currentModel: { providerId: string; modelId: string }
  onModelChange: (model: { providerId: string; modelId: string }) => Promise<void>
}

interface FlatModel extends Model {
  providerName: string
}

export default function ModelSelector(props: ModelSelectorProps) {
  const instanceProviders = () => providers().get(props.instanceId) || []
  let inputRef!: HTMLInputElement

  createEffect(() => {
    if (instanceProviders().length === 0) {
      fetchProviders(props.instanceId).catch(console.error)
    }
  })

  const handleFocus = (e: FocusEvent) => {
    const input = e.target as HTMLInputElement
    input.select()
  }

  const allModels = createMemo<FlatModel[]>(() =>
    instanceProviders().flatMap((p) =>
      p.models.map((m) => ({
        ...m,
        providerName: p.name,
      })),
    ),
  )

  const currentModelValue = createMemo(() =>
    allModels().find((m) => m.providerId === props.currentModel.providerId && m.id === props.currentModel.modelId),
  )

  const handleChange = async (value: FlatModel | null) => {
    if (!value) return

    if (value.providerId !== props.currentModel.providerId || value.id !== props.currentModel.modelId) {
      await props.onModelChange({ providerId: value.providerId, modelId: value.id })
    }
  }

  return (
    <div class="flex items-center gap-2">
      <Combobox
        value={currentModelValue()}
        onChange={handleChange}
        options={allModels()}
        optionValue={(m) => `${m.providerId}/${m.id}`}
        optionTextValue={(m) => `${m.name} ${m.providerName} ${m.providerId}/${m.id}`}
        optionLabel="name"
        placeholder="Search models..."
        defaultFilter="contains"
        triggerMode="focus"
        allowsEmptyCollection={false}
        itemComponent={(itemProps) => (
          <Combobox.Item
            item={itemProps.item}
            class="px-3 py-2 cursor-pointer hover:bg-gray-100 data-[highlighted]:bg-blue-100 rounded outline-none flex items-start gap-2"
          >
            <div class="flex flex-col flex-1 min-w-0">
              <Combobox.ItemLabel class="font-medium text-sm text-gray-900">
                {itemProps.item.rawValue.name}
              </Combobox.ItemLabel>
              <Combobox.ItemDescription class="text-xs text-gray-600">
                {itemProps.item.rawValue.providerName} • {itemProps.item.rawValue.providerId}/
                {itemProps.item.rawValue.id}
              </Combobox.ItemDescription>
            </div>
            <Combobox.ItemIndicator class="flex-shrink-0 mt-0.5">
              <svg class="w-4 h-4 text-blue-600" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M5 13l4 4L19 7" />
              </svg>
            </Combobox.ItemIndicator>
          </Combobox.Item>
        )}
      >
        <Combobox.Control
          data-model-selector
          class="inline-flex items-center justify-between gap-1 px-2 py-1 bg-white border border-gray-300 rounded hover:bg-gray-50 outline-none focus-within:ring-2 focus-within:ring-blue-500 text-xs min-w-[140px]"
        >
          <Combobox.Input
            ref={inputRef}
            onFocus={handleFocus}
            class="bg-transparent border-none outline-none text-xs text-gray-700 placeholder:text-gray-500 w-full min-w-0 px-0"
          />
          <Combobox.Trigger class="flex items-center justify-center">
            <Combobox.Icon>
              <ChevronDown class="w-3 h-3 text-gray-500" />
            </Combobox.Icon>
          </Combobox.Trigger>
        </Combobox.Control>

        <Combobox.Portal>
          <Combobox.Content class="bg-white border border-gray-300 rounded-md shadow-lg max-h-80 overflow-hidden p-1 z-50 min-w-[300px]">
            <Combobox.Listbox class="max-h-80 overflow-auto" />
          </Combobox.Content>
        </Combobox.Portal>
      </Combobox>
      <span class="text-xs text-gray-400">
        <Kbd shortcut="cmd+shift+m" />
      </span>
    </div>
  )
}