"use client";

import {
  Attachment,
  AttachmentPreview,
  AttachmentRemove,
  Attachments,
} from "@/components/ai-elements/attachments";
import {
  ModelSelector,
  ModelSelectorContent,
  ModelSelectorEmpty,
  ModelSelectorGroup,
  ModelSelectorInput,
  ModelSelectorItem,
  ModelSelectorList,
  ModelSelectorLogo,
  ModelSelectorLogoGroup,
  ModelSelectorName,
  ModelSelectorTrigger,
} from "@/components/ai-elements/model-selector";
import type { PromptInputMessage } from "@/components/ai-elements/prompt-input";
import {
  PromptInput,
  PromptInputActionAddAttachments,
  PromptInputActionMenu,
  PromptInputActionMenuContent,
  PromptInputActionMenuTrigger,
  PromptInputBody,
  PromptInputButton,
  PromptInputFooter,
  PromptInputHeader,
  PromptInputSubmit,
  PromptInputTextarea,
  PromptInputTools,
  usePromptInputAttachments,
} from "@/components/ai-elements/prompt-input";
import type { QueueTodo } from "@/components/ai-elements/queue";
import {
  Queue,
  QueueItem,
  QueueItemAction,
  QueueItemActions,
  QueueItemContent,
  QueueItemDescription,
  QueueItemIndicator,
  QueueSection,
  QueueSectionContent,
} from "@/components/ai-elements/queue";
import { CheckIcon, GlobeIcon, Trash2 } from "lucide-react";
import { memo, useCallback, useRef, useState } from "react";

const models = [
  {
    chef: "OpenAI",
    chefSlug: "openai",
    id: "gpt-4o",
    name: "GPT-4o",
    providers: ["openai", "azure"],
  },
  {
    chef: "OpenAI",
    chefSlug: "openai",
    id: "gpt-4o-mini",
    name: "GPT-4o Mini",
    providers: ["openai", "azure"],
  },
  {
    chef: "Anthropic",
    chefSlug: "anthropic",
    id: "claude-opus-4-20250514",
    name: "Claude 4 Opus",
    providers: ["anthropic", "azure", "google", "amazon-bedrock"],
  },
  {
    chef: "Anthropic",
    chefSlug: "anthropic",
    id: "claude-sonnet-4-20250514",
    name: "Claude 4 Sonnet",
    providers: ["anthropic", "azure", "google", "amazon-bedrock"],
  },
  {
    chef: "Google",
    chefSlug: "google",
    id: "gemini-2.0-flash-exp",
    name: "Gemini 2.0 Flash",
    providers: ["google"],
  },
];

const SUBMITTING_TIMEOUT = 200;
const STREAMING_TIMEOUT = 2000;

interface AttachmentItemProps {
  attachment: {
    id: string;
    type: "file";
    filename?: string;
    mediaType?: string;
    url: string;
  };
  onRemove: (id: string) => void;
}

const AttachmentItem = memo(({ attachment, onRemove }: AttachmentItemProps) => {
  const handleRemove = useCallback(
    () => onRemove(attachment.id),
    [onRemove, attachment.id]
  );
  return (
    <Attachment data={attachment} key={attachment.id} onRemove={handleRemove}>
      <AttachmentPreview />
      <AttachmentRemove />
    </Attachment>
  );
});

AttachmentItem.displayName = "AttachmentItem";

interface TodoItemProps {
  todo: QueueTodo;
  onRemove: (id: string) => void;
}

const TodoItem = memo(({ todo, onRemove }: TodoItemProps) => {
  const isCompleted = todo.status === "completed";
  const handleRemove = useCallback(
    () => onRemove(todo.id),
    [onRemove, todo.id]
  );

  return (
    <QueueItem key={todo.id}>
      <div className="flex items-center gap-2">
        <QueueItemIndicator completed={isCompleted} />
        <QueueItemContent completed={isCompleted}>
          {todo.title}
        </QueueItemContent>
        <QueueItemActions>
          <QueueItemAction aria-label="Remove todo" onClick={handleRemove}>
            <Trash2 size={12} />
          </QueueItemAction>
        </QueueItemActions>
      </div>
      {todo.description && (
        <QueueItemDescription completed={isCompleted}>
          {todo.description}
        </QueueItemDescription>
      )}
    </QueueItem>
  );
});

TodoItem.displayName = "TodoItem";

interface ModelItemProps {
  m: (typeof models)[0];
  selectedModel: string;
  onSelect: (id: string) => void;
}

const ModelItem = memo(({ m, selectedModel, onSelect }: ModelItemProps) => {
  const handleSelect = useCallback(() => onSelect(m.id), [onSelect, m.id]);
  return (
    <ModelSelectorItem key={m.id} onSelect={handleSelect} value={m.id}>
      <ModelSelectorLogo provider={m.chefSlug} />
      <ModelSelectorName>{m.name}</ModelSelectorName>
      <ModelSelectorLogoGroup>
        {m.providers.map((provider) => (
          <ModelSelectorLogo key={provider} provider={provider} />
        ))}
      </ModelSelectorLogoGroup>
      {selectedModel === m.id ? (
        <CheckIcon className="ml-auto size-4" />
      ) : (
        <div className="ml-auto size-4" />
      )}
    </ModelSelectorItem>
  );
});

ModelItem.displayName = "ModelItem";

const sampleTodos: QueueTodo[] = [
  {
    description: "Complete the README and API docs",
    id: "todo-1",
    status: "completed",
    title: "Write project documentation",
  },
  {
    id: "todo-2",
    status: "pending",
    title: "Implement authentication",
  },
  {
    description: "Resolve crash on settings page",
    id: "todo-3",
    status: "pending",
    title: "Fix bug #42",
  },
  {
    description: "Unify queue and todo state management",
    id: "todo-4",
    status: "pending",
    title: "Refactor queue logic",
  },
  {
    description: "Increase test coverage for hooks",
    id: "todo-5",
    status: "pending",
    title: "Add unit tests",
  },
];

const PromptInputAttachmentsDisplay = () => {
  const attachments = usePromptInputAttachments();

  const handleRemove = useCallback(
    (id: string) => attachments.remove(id),
    [attachments]
  );

  if (attachments.files.length === 0) {
    return null;
  }

  return (
    <Attachments variant="inline">
      {attachments.files.map((attachment) => (
        <AttachmentItem
          attachment={attachment}
          key={attachment.id}
          onRemove={handleRemove}
        />
      ))}
    </Attachments>
  );
};

const Example = () => {
  const [todos, setTodos] = useState(sampleTodos);

  const handleRemoveTodo = useCallback((id: string) => {
    setTodos((prev) => prev.filter((todo) => todo.id !== id));
  }, []);

  const [text, setText] = useState<string>("");
  const [model, setModel] = useState<string>(models[0].id);
  const [modelSelectorOpen, setModelSelectorOpen] = useState(false);
  const [status, setStatus] = useState<
    "submitted" | "streaming" | "ready" | "error"
  >("ready");
  const timeoutRef = useRef<NodeJS.Timeout | null>(null);

  const handleTextChange = useCallback(
    (e: React.ChangeEvent<HTMLTextAreaElement>) => setText(e.target.value),
    []
  );

  const handleModelSelect = useCallback((id: string) => {
    setModel(id);
    setModelSelectorOpen(false);
  }, []);

  const selectedModelData = models.find((m) => m.id === model);

  const stop = () => {
    console.log("Stopping request...");

    // Clear any pending timeouts
    if (timeoutRef.current) {
      clearTimeout(timeoutRef.current);
      timeoutRef.current = null;
    }

    setStatus("ready");
  };

  const handleSubmit = useCallback(
    (message: PromptInputMessage) => {
      // If currently streaming or submitted, stop instead of submitting
      if (status === "streaming" || status === "submitted") {
        stop();
        return;
      }

      const hasText = Boolean(message.text);
      const hasAttachments = Boolean(message.files?.length);

      if (!(hasText || hasAttachments)) {
        return;
      }

      setStatus("submitted");

      console.log("Submitting message:", message);

      setTimeout(() => {
        setStatus("streaming");
      }, SUBMITTING_TIMEOUT);

      timeoutRef.current = setTimeout(() => {
        setStatus("ready");
        timeoutRef.current = null;
      }, STREAMING_TIMEOUT);
    },
    [status]
  );

  return (
    <div className="flex size-full flex-col justify-end">
      <Queue className="mx-auto max-h-[150px] w-[95%] overflow-y-auto rounded-b-none border-input border-b-0">
        {todos.length > 0 && (
          <QueueSection>
            <QueueSectionContent>
              <div>
                {todos.map((todo) => (
                  <TodoItem
                    key={todo.id}
                    onRemove={handleRemoveTodo}
                    todo={todo}
                  />
                ))}
              </div>
            </QueueSectionContent>
          </QueueSection>
        )}
      </Queue>
      <PromptInput globalDrop multiple onSubmit={handleSubmit}>
        <PromptInputHeader>
          <PromptInputAttachmentsDisplay />
        </PromptInputHeader>
        <PromptInputBody>
          <PromptInputTextarea onChange={handleTextChange} value={text} />
        </PromptInputBody>
        <PromptInputFooter>
          <PromptInputTools>
            <PromptInputActionMenu>
              <PromptInputActionMenuTrigger />
              <PromptInputActionMenuContent>
                <PromptInputActionAddAttachments />
              </PromptInputActionMenuContent>
            </PromptInputActionMenu>
            <PromptInputButton>
              <GlobeIcon size={16} />
              <span>Search</span>
            </PromptInputButton>
            <ModelSelector
              onOpenChange={setModelSelectorOpen}
              open={modelSelectorOpen}
            >
              <ModelSelectorTrigger asChild>
                <PromptInputButton>
                  {selectedModelData?.chefSlug && (
                    <ModelSelectorLogo provider={selectedModelData.chefSlug} />
                  )}
                  {selectedModelData?.name && (
                    <ModelSelectorName>
                      {selectedModelData.name}
                    </ModelSelectorName>
                  )}
                </PromptInputButton>
              </ModelSelectorTrigger>
              <ModelSelectorContent>
                <ModelSelectorInput placeholder="Search models..." />
                <ModelSelectorList>
                  <ModelSelectorEmpty>No models found.</ModelSelectorEmpty>
                  {["OpenAI", "Anthropic", "Google"].map((chef) => (
                    <ModelSelectorGroup heading={chef} key={chef}>
                      {models
                        .filter((m) => m.chef === chef)
                        .map((m) => (
                          <ModelItem
                            key={m.id}
                            m={m}
                            onSelect={handleModelSelect}
                            selectedModel={model}
                          />
                        ))}
                    </ModelSelectorGroup>
                  ))}
                </ModelSelectorList>
              </ModelSelectorContent>
            </ModelSelector>
          </PromptInputTools>
          <PromptInputSubmit status={status} />
        </PromptInputFooter>
      </PromptInput>
    </div>
  );
};

export default Example;