import cls from 'classnames';
import React, {
  Fragment,
  ReactNode,
  startTransition,
  useCallback,
  useEffect,
  useMemo,
  useReducer,
  useRef,
  useState,
} from 'react';

import { Button } from '@opensumi/ide-components/lib/button';
import { BasicRecycleTree, IBasicRecycleTreeHandle, IBasicTreeData } from '@opensumi/ide-components/lib/recycle-tree';
import {
  BasicCompositeTreeNode,
  BasicTreeNode,
} from '@opensumi/ide-components/lib/recycle-tree/basic/tree-node.define';
import { Tooltip } from '@opensumi/ide-components/lib/tooltip';
import {
  CommandService,
  DisposableCollection,
  EDITOR_COMMANDS,
  IContextKeyService,
  LabelService,
  useInjectable,
} from '@opensumi/ide-core-browser';
import { Icon, getIcon } from '@opensumi/ide-core-browser/lib/components';
import { Loading } from '@opensumi/ide-core-browser/lib/components/ai-native';
import {
  ActionSourceEnum,
  ActionTypeEnum,
  ChatAgentViewServiceToken,
  ChatRenderRegistryToken,
  ChatServiceToken,
  FileType,
  IAIReporter,
  IChatComponent,
  IChatContent,
  IChatResponseProgressFileTreeData,
  IChatToolContent,
  URI,
  localize,
} from '@opensumi/ide-core-common';
import { IIconService } from '@opensumi/ide-theme';
import { IMarkdownString, MarkdownString } from '@opensumi/monaco-editor-core/esm/vs/base/common/htmlContent';

import { IChatAgentService, IChatInternalService } from '../../common';
import { ChatRequestModel } from '../chat/chat-model';
import { ChatService } from '../chat/chat.api.service';
import { ChatInternalService } from '../chat/chat.internal.service';
import { ChatRenderRegistry } from '../chat/chat.render.registry';
import { MsgHistoryManager } from '../model/msg-history-manager';
import { IChatAgentViewService } from '../types';

import { ChatMarkdown } from './ChatMarkdown';
import { ChatThinking, ChatThinkingResult } from './ChatThinking';
import styles from './components.module.less';

interface IChatReplyProps {
  relationId: string;
  request: ChatRequestModel;
  history: MsgHistoryManager;
  startTime?: number;
  agentId?: string;
  command?: string;
  onRegenerate?: () => void;
  onDidChange?: () => void;
  onDone?: () => void;
  msgId: string;
}

const TreeRenderer = (props: { treeData: IChatResponseProgressFileTreeData }) => {
  const labelService = useInjectable<LabelService>(LabelService);
  const commandService = useInjectable<CommandService>(CommandService);

  const getIconClassName = (uri: URI, isDirectory: boolean, expanded: boolean) => {
    // getIcon 没有处理 isOpenedDirectory
    let iconClassName = labelService.getIcon(uri, { isDirectory });
    if (isDirectory && expanded) {
      iconClassName += ' expanded';
    }
    return iconClassName;
  };

  const recycleTreeData = useMemo(() => {
    const transform = (item: IChatResponseProgressFileTreeData): IBasicTreeData => {
      const isDirectory = typeof item.type === 'number' ? item.type === FileType.Directory : !!item.children;
      const uri = new URI(item.uri);
      return {
        label: item.label,
        iconClassName: getIconClassName(uri, isDirectory, isDirectory),
        expandable: true,
        expanded: true,
        children: isDirectory ? (item.children || []).map(transform) : null,
        uri,
      };
    };
    return (props.treeData.children || []).map(transform);
  }, [props.treeData]);

  const [height, setHeight] = useState(22);

  const fileHandle = useRef<IBasicRecycleTreeHandle | null>(null);

  const onReady = (handle: IBasicRecycleTreeHandle) => {
    fileHandle.current = handle;
    const calcHeight = () => {
      let size = handle.getModel().root.branchSize;
      if (size < 1) {
        size = 1;
      } else if (size > 20) {
        size = 20;
      }
      setHeight(size * 22);
    };
    calcHeight();
    handle.onDidUpdate(calcHeight);
  };

  if (!recycleTreeData.length) {
    return null;
  }

  return (
    <div className={styles.tree_container}>
      <BasicRecycleTree
        height={height}
        treeData={recycleTreeData}
        onContextMenu={(e) => e.preventDefault()}
        onClick={(e, item: BasicCompositeTreeNode | BasicTreeNode) => {
          if (!fileHandle.current || !item) {
            return;
          }
          if (!BasicCompositeTreeNode.is(item)) {
            commandService.executeCommand(EDITOR_COMMANDS.OPEN_RESOURCE.id, item.raw.uri, {
              disableNavigate: true,
              preview: true,
            });
          } else {
            item.raw.iconClassName = getIconClassName(item.raw.uri, true, item.expanded);
          }
        }}
        onReady={onReady}
        treeName={props.treeData.label}
        leaveBottomBlank={false}
        baseIndent={0}
      />
    </div>
  );
};

const ToolCallRender = (props: { toolCall: IChatToolContent['content']; messageId?: string }) => {
  const { toolCall, messageId } = props;
  const chatAgentViewService = useInjectable<IChatAgentViewService>(ChatAgentViewServiceToken);
  const [node, setNode] = useState<React.JSX.Element | null>(null);

  useEffect(() => {
    const config = chatAgentViewService.getChatComponent('toolCall');
    if (config) {
      const { component: Component, initialProps } = config;
      setNode(<Component {...initialProps} value={toolCall} messageId={messageId} />);
      return;
    }
    setNode(
      <div>
        <Loading />
        <span style={{ marginLeft: 4 }}>正在加载组件</span>
      </div>,
    );
    const deferred = chatAgentViewService.getChatComponentDeferred('toolCall')!;
    deferred.promise.then(({ component: Component, initialProps }) => {
      setNode(<Component {...initialProps} value={toolCall} messageId={messageId} />);
    });
  }, [toolCall.state]);

  return node;
};

const ComponentRender = (props: { component: string; value?: unknown; messageId?: string }) => {
  const chatAgentViewService = useInjectable<IChatAgentViewService>(ChatAgentViewServiceToken);
  const [node, setNode] = useState<React.JSX.Element | null>(null);

  useEffect(() => {
    const config = chatAgentViewService.getChatComponent(props.component);
    if (config) {
      const { component: Component, initialProps } = config;
      setNode(<Component {...initialProps} value={props.value} messageId={props.messageId} />);
      return;
    }
    setNode(
      <div>
        <Loading />
        <span style={{ marginLeft: 4 }}>正在加载组件</span>
      </div>,
    );
    const deferred = chatAgentViewService.getChatComponentDeferred(props.component)!;
    deferred.promise.then(({ component: Component, initialProps }) => {
      setNode(<Component {...initialProps} value={props.value} />);
    });
  }, [props.component, props.value]);

  return node;
};

export const ChatReply = (props: IChatReplyProps) => {
  const {
    relationId,
    request,
    startTime = 0,
    onRegenerate,
    onDidChange,
    onDone,
    agentId,
    command,
    history,
    msgId,
  } = props;

  const [, update] = useReducer((num) => (num + 1) % 1_000_000, 0);
  const aiReporter = useInjectable<IAIReporter>(IAIReporter);
  const iconService = useInjectable<IIconService>(IIconService);
  const contextKeyService = useInjectable<IContextKeyService>(IContextKeyService);
  const aiChatService = useInjectable<ChatInternalService>(IChatInternalService);
  const chatApiService = useInjectable<ChatService>(ChatServiceToken);
  const chatAgentService = useInjectable<IChatAgentService>(IChatAgentService);
  const chatRenderRegistry = useInjectable<ChatRenderRegistry>(ChatRenderRegistryToken);
  const [collapseThinkingIndexSet, setCollapseThinkingIndexSet] = useState<Set<number>>(
    !request.response.isComplete
      ? new Set()
      : new Set(
          request.response.responseContents
            .map((item, index) => (item.kind === 'reasoning' ? index : -1))
            .filter((item) => item !== -1),
        ),
  );

  useEffect(() => {
    if (request.response.isComplete) {
      setCollapseThinkingIndexSet(
        new Set(
          request.response.responseContents
            .map((item, index) => (item.kind === 'reasoning' ? index : -1))
            .filter((item) => item !== -1),
        ),
      );
    }
  }, [request.response.isComplete]);

  useEffect(() => {
    const disposableCollection = new DisposableCollection();

    disposableCollection.push(
      request.response.onDidChange(() => {
        history.updateAssistantMessage(msgId, { content: request.response.responseText });

        if (request.response.isComplete) {
          if (onDone) {
            onDone();
          }
          // 模型消息返回结束，上报消息（包含toolCall等全部结束）
          aiReporter.end(relationId, {
            assistantMessage: request.response.responseText,
            replytime: Date.now() - startTime,
            success: true,
            isStop: false,
            command,
            agentId,
            messageId: msgId,
            sessionId: aiChatService.sessionModel.sessionId,
          });
        }

        startTransition(() => {
          onDidChange?.();
          update();
        });
      }),
    );

    return () => disposableCollection.dispose();
  }, [relationId, onDidChange, onDone]);

  const handleRegenerate = useCallback(() => {
    request.response.reset();
    onRegenerate?.();
  }, [onRegenerate]);

  const renderMarkdown = useCallback(
    (markdown: IMarkdownString) => {
      if (chatRenderRegistry.chatAIRoleRender) {
        const Render = chatRenderRegistry.chatAIRoleRender;
        return <Render content={markdown.value} />;
      }

      return <ChatMarkdown markdown={markdown} fillInIncompleteTokens />;
    },
    [chatRenderRegistry, chatRenderRegistry.chatAIRoleRender],
  );

  const renderTreeData = (treeData: IChatResponseProgressFileTreeData) => <TreeRenderer treeData={treeData} />;

  const renderPlaceholder = (markdown: IMarkdownString) => (
    <div className={styles.placeholder}>
      <Icon iconClass={iconService.fromString('$(codicon/sync~spin)')} />
      <div className={styles.placeholder_content}>{renderMarkdown(markdown)}</div>
    </div>
  );

  const contentNode = React.useMemo(
    () =>
      request.response.responseContents.map((item, index) => {
        let node: ReactNode;
        if (item.kind === 'asyncContent') {
          node = renderPlaceholder(new MarkdownString(item.content));
        } else if (item.kind === 'treeData') {
          node = renderTreeData(item.treeData);
        } else if (item.kind === 'component') {
          node = <ComponentRender component={item.component} value={item.value} messageId={msgId} />;
        } else if (item.kind === 'toolCall') {
          node = <ToolCallRender toolCall={item.content} messageId={msgId} />;
        } else if (item.kind === 'reasoning') {
          // 思考中必然为最后一条
          const isThinking = index === request.response.responseContents.length - 1 && !request.response.isComplete;
          node = (
            <div className={cls(styles.reasoning, { [styles.thinking]: isThinking })}>
              <Button
                size='small'
                type='secondary'
                className={styles.thinking}
                onClick={() => {
                  if (isThinking) {
                    return;
                  }
                  if (collapseThinkingIndexSet.has(index)) {
                    collapseThinkingIndexSet.delete(index);
                  } else {
                    collapseThinkingIndexSet.add(index);
                  }
                  setCollapseThinkingIndexSet(new Set(collapseThinkingIndexSet));
                }}
              >
                <Icon iconClass='codicon codicon-sparkle' />
                {localize('aiNative.chat.thinking')}
                {isThinking ? (
                  <Loading />
                ) : collapseThinkingIndexSet.has(index) ? (
                  <Icon iconClass='codicon codicon-chevron-right' />
                ) : (
                  <Icon iconClass='codicon codicon-chevron-down' />
                )}
              </Button>
              {!collapseThinkingIndexSet.has(index) ? (
                <div className={styles.reasoning_content}>{renderMarkdown(new MarkdownString(item.content))}</div>
              ) : null}
            </div>
          );
        } else {
          node = renderMarkdown(item.content);
        }
        return <Fragment key={`${item.kind}-${index}`}>{node}</Fragment>;
      }),
    [request.response.responseContents, collapseThinkingIndexSet],
  );

  const followupNode = React.useMemo(() => {
    if (!request.response.followups) {
      return null;
    }
    return request.response.followups.map((item, index) => {
      let node: React.ReactNode = null;
      if (item.kind === 'reply') {
        const a = (
          <a
            onClick={() => {
              chatApiService.sendMessage({
                ...chatAgentService.parseMessage(item.message),
                reportExtra: {
                  actionSource: ActionSourceEnum.Chat,
                  actionType: ActionTypeEnum.Followup,
                },
              });
            }}
          >
            {item.title || item.message}
          </a>
        );
        node = item.tooltip ? <Tooltip title={item.tooltip}>{a}</Tooltip> : a;
      } else {
        if (item.when && !contextKeyService.match(item.when)) {
          node = null;
        }
        node = <Button type='default'>{item.title}</Button>;
      }
      return node && <Fragment key={index}>{node}</Fragment>;
    });
  }, [request.response.followups]);

  if (!request.response.isComplete) {
    return <ChatThinking message={request.response.responseText}>{contentNode}</ChatThinking>;
  }

  return (
    <ChatThinkingResult
      hasMessage={
        request.response.responseParts.length > 0 ||
        request.response.responseContents.length > 0 ||
        !!request.response.errorDetails?.message
      }
      onRegenerate={handleRegenerate}
      requestId={request.requestId}
    >
      <div className={styles.ai_chat_response_container}>
        {request.response.errorDetails?.message ? (
          <div className={styles.error}>
            <Icon className={getIcon('close-circle')} />
            <span>{request.response.errorDetails.message}</span>
          </div>
        ) : (
          <>
            {contentNode}
            {followupNode?.length !== 0 && <div className={styles.followups}>{followupNode}</div>}
          </>
        )}
      </div>
    </ChatThinkingResult>
  );
};

interface IChatNotifyProps {
  requestId: string;
  chunk: IChatContent | IChatComponent;
}
export const ChatNotify = (props: IChatNotifyProps) => {
  const { chunk } = props;
  const chatRenderRegistry = useInjectable<ChatRenderRegistry>(ChatRenderRegistryToken);

  const contentNode = React.useMemo(() => {
    let node: ReactNode;

    if (chunk.kind === 'component') {
      node = <ComponentRender component={chunk.component} value={chunk.value} />;
    } else {
      let renderContent = <ChatMarkdown markdown={chunk.content} fillInIncompleteTokens />;

      if (chatRenderRegistry.chatAIRoleRender) {
        const ChatAIRoleRender = chatRenderRegistry.chatAIRoleRender;
        renderContent = <ChatAIRoleRender content={chunk.content} />;
      }

      node = renderContent;
    }
    return node;
  }, [chunk]);

  return (
    <ChatThinkingResult hasMessage requestId={props.requestId} showRegenerate={false}>
      <div className={styles.ai_chat_response_container}>{contentNode}</div>
    </ChatThinkingResult>
  );
};
