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# Source code for langchain_community.document_loaders.facebook_chat

    import datetime
    import json
    from pathlib import Path
    from typing import Iterator, Union

    from langchain_core.documents import Document

    from langchain_community.document_loaders.base import BaseLoader

    def concatenate_rows(row: dict) -> str:
        """Combine message information in a readable format ready to be used.

        Args:
            row: dictionary containing message information.
        """
        sender = row["sender_name"]
        text = row["content"]
        date = datetime.datetime.fromtimestamp(row["timestamp_ms"] / 1000).strftime(
            "%Y-%m-%d %H:%M:%S"
        )
        return f"{sender} on {date}: {text}\n\n"

    class FacebookChatLoader(BaseLoader):
        """Load `Facebook Chat` messages directory dump."""

        def __init__(self, path: Union[str, Path]):
            """Initialize with a path."""
            self.file_path = path

        def lazy_load(self) -> Iterator[Document]:
            p = Path(self.file_path)

            with open(p, encoding="utf8") as f:
                d = json.load(f)

            text = "".join(
                concatenate_rows(message)
                for message in d["messages"]
                if message.get("content") and isinstance(message["content"], str)
            )
            metadata = {"source": str(p)}

            yield Document(page_content=text, metadata=metadata)