import logging

import pytest

from haystack.dataclasses import ByteStream
from haystack.components.converters.pdfminer import PDFMinerToDocument


class TestPDFMinerToDocument:
    def test_run(self, test_files_path):
        """
        Test if the component runs correctly.
        """
        converter = PDFMinerToDocument()
        sources = [test_files_path / "pdf" / "sample_pdf_1.pdf"]
        results = converter.run(sources=sources)
        docs = results["documents"]

        assert len(docs) == 1
        for doc in docs:
            assert "the page 3 is empty" in doc.content
            assert "Page 4 of Sample PDF" in doc.content

    def test_init_params_custom(self, test_files_path):
        """
        Test if init arguments are passed successfully to PDFMinerToDocument layout parameters
        """
        converter = PDFMinerToDocument(char_margin=0.5, all_texts=True)
        assert converter.layout_params.char_margin == 0.5
        assert converter.layout_params.all_texts is True

    def test_run_wrong_file_type(self, test_files_path, caplog):
        """
        Test if the component runs correctly when an input file is not of the expected type.
        """
        sources = [test_files_path / "audio" / "answer.wav"]
        converter = PDFMinerToDocument()

        with caplog.at_level(logging.WARNING):
            output = converter.run(sources=sources)
            assert "Is this really a PDF?" in caplog.text

        docs = output["documents"]
        assert not docs

    def test_arg_is_none(self, test_files_path):
        """
        Test if the component runs correctly when an argument is None.
        """
        converter = PDFMinerToDocument(char_margin=None)
        assert converter.layout_params.char_margin is None

    def test_run_doc_metadata(self, test_files_path):
        """
        Test if the component runs correctly when metadata is supplied by the user.
        """
        converter = PDFMinerToDocument()
        sources = [test_files_path / "pdf" / "sample_pdf_2.pdf"]
        metadata = [{"file_name": "sample_pdf_2.pdf"}]
        results = converter.run(sources=sources, meta=metadata)
        docs = results["documents"]

        assert len(docs) == 1
        assert "Ward Cunningham" in docs[0].content
        assert docs[0].meta["file_name"] == "sample_pdf_2.pdf"

    def test_incorrect_meta(self, test_files_path):
        """
        Test if the component raises an error when incorrect metadata is supplied by the user.
        """
        converter = PDFMinerToDocument()
        sources = [test_files_path / "pdf" / "sample_pdf_3.pdf"]
        metadata = [{"file_name": "sample_pdf_3.pdf"}, {"file_name": "sample_pdf_2.pdf"}]
        with pytest.raises(ValueError, match="The length of the metadata list must match the number of sources."):
            converter.run(sources=sources, meta=metadata)

    def test_run_bytestream_metadata(self, test_files_path):
        """
        Test if the component runs correctly when metadata is read from the ByteStream object.
        """
        converter = PDFMinerToDocument()
        with open(test_files_path / "pdf" / "sample_pdf_2.pdf", "rb") as file:
            byte_stream = file.read()
            stream = ByteStream(byte_stream, meta={"content_type": "text/pdf", "url": "test_url"})

        results = converter.run(sources=[stream])
        docs = results["documents"]

        assert len(docs) == 1
        assert "Ward Cunningham" in docs[0].content
        assert docs[0].meta == {"content_type": "text/pdf", "url": "test_url"}

    def test_run_bytestream_doc_overlapping_metadata(self, test_files_path):
        """
        Test if the component runs correctly when metadata is read from the ByteStream object and supplied by the user.

        There is an overlap between the metadata received.

        The component should use the supplied metadata to overwrite the values if there is an overlap between the keys.
        """
        converter = PDFMinerToDocument()
        with open(test_files_path / "pdf" / "sample_pdf_2.pdf", "rb") as file:
            byte_stream = file.read()
            # ByteStream has "url" present in metadata
            stream = ByteStream(byte_stream, meta={"content_type": "text/pdf", "url": "test_url_correct"})

        # "url" supplied by the user overwrites value present in metadata
        metadata = [{"file_name": "sample_pdf_2.pdf", "url": "test_url_new"}]
        results = converter.run(sources=[stream], meta=metadata)
        docs = results["documents"]

        assert len(docs) == 1
        assert "Ward Cunningham" in docs[0].content
        assert docs[0].meta == {"file_name": "sample_pdf_2.pdf", "content_type": "text/pdf", "url": "test_url_new"}

    def test_run_error_handling(self, caplog):
        """
        Test if the component correctly handles errors.
        """
        sources = ["non_existing_file.pdf"]
        converter = PDFMinerToDocument()
        with caplog.at_level(logging.WARNING):
            results = converter.run(sources=sources)
            assert "Could not read non_existing_file.pdf" in caplog.text
            assert results["documents"] == []