import download from 'downloadjs';
import exportFromJSON from 'export-from-json';
import { useGetMessagesByConvoId } from 'librechat-data-provider/react-query';
import {
  ContentTypes,
  ToolCallTypes,
  imageGenTools,
  isImageVisionTool,
} from 'librechat-data-provider';
import type {
  TMessage,
  TPreset,
  TConversation,
  TMessageContentParts,
} from 'librechat-data-provider';
import useBuildMessageTree from '~/hooks/Messages/useBuildMessageTree';
import { useScreenshot } from '~/hooks/ScreenshotContext';
import { cleanupPreset, buildTree } from '~/utils';

export default function useExportConversation({
  conversation,
  filename,
  type,
  includeOptions,
  exportBranches,
  recursive,
}: {
  conversation: TConversation | null;
  filename: string;
  type: string;
  includeOptions: boolean | 'indeterminate';
  exportBranches: boolean | 'indeterminate';
  recursive: boolean | 'indeterminate';
}) {
  const { captureScreenshot } = useScreenshot();
  const buildMessageTree = useBuildMessageTree();
  const { data: messagesTree = null } = useGetMessagesByConvoId(
    conversation?.conversationId ?? '',
    {
      select: (data) => {
        const dataTree = buildTree({ messages: data });
        return dataTree?.length === 0 ? null : dataTree ?? null;
      },
    },
  );

  const getMessageText = (message: TMessage, format = 'text') => {
    if (!message) {
      return '';
    }

    const formatText = (sender, text) => {
      if (format === 'text') {
        return `>> ${sender}:\n${text}`;
      }
      return `**${sender}**\n${text}`;
    };

    if (!message.content) {
      return formatText(message.sender, message.text);
    }

    return message.content
      .map((content) => getMessageContent(message.sender, content))
      .map((text) => {
        return formatText(text[0], text[1]);
      })
      .join('\n\n\n');
  };

  /**
   * Format and return message texts according to the type of content.
   * Currently, content whose type is `TOOL_CALL` basically returns JSON as is.
   * In the future, different formatted text may be returned for each type.
   */
  const getMessageContent = (sender: string, content: TMessageContentParts): string[] => {
    if (!content) {
      return [];
    }

    if (content.type === ContentTypes.ERROR) {
      // ERROR
      return [sender, content[ContentTypes.TEXT].value];
    }

    if (content.type === ContentTypes.TEXT) {
      // TEXT
      return [sender, content[ContentTypes.TEXT].value];
    }

    if (content.type === ContentTypes.TOOL_CALL) {
      const type = content[ContentTypes.TOOL_CALL].type;

      if (type === ToolCallTypes.CODE_INTERPRETER) {
        // CODE_INTERPRETER
        const toolCall = content[ContentTypes.TOOL_CALL];
        const code_interpreter = toolCall[ToolCallTypes.CODE_INTERPRETER];
        return ['Code Interpreter', JSON.stringify(code_interpreter)];
      }

      if (type === ToolCallTypes.RETRIEVAL) {
        // RETRIEVAL
        const toolCall = content[ContentTypes.TOOL_CALL];
        return ['Retrieval', JSON.stringify(toolCall)];
      }

      if (
        type === ToolCallTypes.FUNCTION &&
        imageGenTools.has(content[ContentTypes.TOOL_CALL].function.name)
      ) {
        // IMAGE_GENERATION
        const toolCall = content[ContentTypes.TOOL_CALL];
        return ['Tool', JSON.stringify(toolCall)];
      }

      if (type === ToolCallTypes.FUNCTION) {
        // IMAGE_VISION
        const toolCall = content[ContentTypes.TOOL_CALL];
        if (isImageVisionTool(toolCall)) {
          return ['Tool', JSON.stringify(toolCall)];
        }
        return ['Tool', JSON.stringify(toolCall)];
      }
    }

    if (content.type === ContentTypes.IMAGE_FILE) {
      // IMAGE
      const imageFile = content[ContentTypes.IMAGE_FILE];
      return ['Image', JSON.stringify(imageFile)];
    }

    return [sender, JSON.stringify(content)];
  };

  const exportScreenshot = async () => {
    let data;
    try {
      data = await captureScreenshot();
    } catch (err) {
      console.error('Failed to capture screenshot');
      return console.error(err);
    }
    download(data, `${filename}.png`, 'image/png');
  };

  const exportCSV = async () => {
    const data: TMessage[] = [];

    const messages = await buildMessageTree({
      messageId: conversation?.conversationId,
      message: null,
      messages: messagesTree,
      branches: !!exportBranches,
      recursive: false,
    });

    if (Array.isArray(messages)) {
      for (const message of messages) {
        data.push(message);
      }
    } else {
      data.push(messages);
    }

    exportFromJSON({
      data: data,
      fileName: filename,
      extension: 'csv',
      exportType: exportFromJSON.types.csv,
      beforeTableEncode: (entries) => [
        {
          fieldName: 'sender',
          fieldValues: entries?.find((e) => e.fieldName == 'sender')?.fieldValues ?? [],
        },
        {
          fieldName: 'text',
          fieldValues: entries?.find((e) => e.fieldName == 'text')?.fieldValues ?? [],
        },
        {
          fieldName: 'isCreatedByUser',
          fieldValues: entries?.find((e) => e.fieldName == 'isCreatedByUser')?.fieldValues ?? [],
        },
        {
          fieldName: 'error',
          fieldValues: entries?.find((e) => e.fieldName == 'error')?.fieldValues ?? [],
        },
        {
          fieldName: 'unfinished',
          fieldValues: entries?.find((e) => e.fieldName == 'unfinished')?.fieldValues ?? [],
        },
        {
          fieldName: 'messageId',
          fieldValues: entries?.find((e) => e.fieldName == 'messageId')?.fieldValues ?? [],
        },
        {
          fieldName: 'parentMessageId',
          fieldValues: entries?.find((e) => e.fieldName == 'parentMessageId')?.fieldValues ?? [],
        },
        {
          fieldName: 'createdAt',
          fieldValues: entries?.find((e) => e.fieldName == 'createdAt')?.fieldValues ?? [],
        },
      ],
    });
  };

  const exportMarkdown = async () => {
    let data =
      '# Conversation\n' +
      `- conversationId: ${conversation?.conversationId}\n` +
      `- endpoint: ${conversation?.endpoint}\n` +
      `- title: ${conversation?.title}\n` +
      `- exportAt: ${new Date().toTimeString()}\n`;

    if (includeOptions) {
      data += '\n## Options\n';
      const options = cleanupPreset({ preset: conversation as TPreset });

      for (const key of Object.keys(options)) {
        data += `- ${key}: ${options[key]}\n`;
      }
    }

    const messages = await buildMessageTree({
      messageId: conversation?.conversationId,
      message: null,
      messages: messagesTree,
      branches: false,
      recursive: false,
    });

    data += '\n## History\n';
    if (Array.isArray(messages)) {
      for (const message of messages) {
        data += `${getMessageText(message, 'md')}\n`;
        if (message.error) {
          data += '*(This is an error message)*\n';
        }
        if (message.unfinished) {
          data += '*(This is an unfinished message)*\n';
        }
        data += '\n\n';
      }
    } else {
      data += `${getMessageText(messages, 'md')}\n`;
      if (messages.error) {
        data += '*(This is an error message)*\n';
      }
      if (messages.unfinished) {
        data += '*(This is an unfinished message)*\n';
      }
    }

    exportFromJSON({
      data: data,
      fileName: filename,
      extension: 'md',
      exportType: exportFromJSON.types.txt,
    });
  };

  const exportText = async () => {
    let data =
      'Conversation\n' +
      '########################\n' +
      `conversationId: ${conversation?.conversationId}\n` +
      `endpoint: ${conversation?.endpoint}\n` +
      `title: ${conversation?.title}\n` +
      `exportAt: ${new Date().toTimeString()}\n`;

    if (includeOptions) {
      data += '\nOptions\n########################\n';
      const options = cleanupPreset({ preset: conversation as TPreset });

      for (const key of Object.keys(options)) {
        data += `${key}: ${options[key]}\n`;
      }
    }

    const messages = await buildMessageTree({
      messageId: conversation?.conversationId,
      message: null,
      messages: messagesTree,
      branches: false,
      recursive: false,
    });

    data += '\nHistory\n########################\n';
    if (Array.isArray(messages)) {
      for (const message of messages) {
        data += `${getMessageText(message)}\n`;
        if (message.error) {
          data += '(This is an error message)\n';
        }
        if (message.unfinished) {
          data += '(This is an unfinished message)\n';
        }
        data += '\n\n';
      }
    } else {
      data += `${getMessageText(messages)}\n`;
      if (messages.error) {
        data += '(This is an error message)\n';
      }
      if (messages.unfinished) {
        data += '(This is an unfinished message)\n';
      }
    }

    exportFromJSON({
      data: data,
      fileName: filename,
      extension: 'txt',
      exportType: exportFromJSON.types.txt,
    });
  };

  const exportJSON = async () => {
    const data = {
      conversationId: conversation?.conversationId,
      endpoint: conversation?.endpoint,
      title: conversation?.title,
      exportAt: new Date().toTimeString(),
      branches: exportBranches,
      recursive: recursive,
    };

    if (includeOptions) {
      data['options'] = cleanupPreset({ preset: conversation as TPreset });
    }

    const messages = await buildMessageTree({
      messageId: conversation?.conversationId,
      message: null,
      messages: messagesTree,
      branches: !!exportBranches,
      recursive: !!recursive,
    });

    if (recursive && !Array.isArray(messages)) {
      data['messagesTree'] = messages.children;
    } else {
      data['messages'] = messages;
    }

    exportFromJSON({
      data: data,
      fileName: filename,
      extension: 'json',
      exportType: exportFromJSON.types.json,
    });
  };

  const exportConversation = () => {
    if (type === 'json') {
      exportJSON();
    } else if (type == 'text') {
      exportText();
    } else if (type == 'markdown') {
      exportMarkdown();
    } else if (type == 'csv') {
      exportCSV();
    } else if (type == 'screenshot') {
      exportScreenshot();
    }
  };

  return { exportConversation };
}