"""Tests for FileProcessor class."""

import pytest

from crewai.utilities.files import FileBytes, ImageFile, PDFFile, TextFile
from crewai.utilities.files.processing.constraints import (
    ANTHROPIC_CONSTRAINTS,
    ImageConstraints,
    PDFConstraints,
    ProviderConstraints,
)
from crewai.utilities.files.processing.enums import FileHandling
from crewai.utilities.files.processing.exceptions import (
    FileTooLargeError,
    FileValidationError,
)
from crewai.utilities.files.processing.processor import FileProcessor


# Minimal valid PNG: 8x8 pixel RGB image (valid for PIL)
MINIMAL_PNG = bytes([
    0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d,
    0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x08,
    0x08, 0x02, 0x00, 0x00, 0x00, 0x4b, 0x6d, 0x29, 0xdc, 0x00, 0x00, 0x00,
    0x12, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0xfc, 0xcf, 0x80, 0x1d,
    0x30, 0xe1, 0x10, 0x1f, 0xa4, 0x12, 0x00, 0xcd, 0x41, 0x01, 0x0f, 0xe8,
    0x41, 0xe2, 0x6f, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae,
    0x42, 0x60, 0x82,
])

# Minimal valid PDF
MINIMAL_PDF = (
    b"%PDF-1.4\n1 0 obj<</Type/Catalog/Pages 2 0 R>>endobj "
    b"2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>endobj "
    b"3 0 obj<</Type/Page/MediaBox[0 0 612 792]/Parent 2 0 R>>endobj "
    b"xref\n0 4\n0000000000 65535 f \n0000000009 00000 n \n"
    b"0000000052 00000 n \n0000000101 00000 n \n"
    b"trailer<</Size 4/Root 1 0 R>>\nstartxref\n178\n%%EOF"
)


class TestFileProcessorInit:
    """Tests for FileProcessor initialization."""

    def test_init_with_constraints(self):
        """Test initialization with ProviderConstraints."""
        processor = FileProcessor(constraints=ANTHROPIC_CONSTRAINTS)

        assert processor.constraints == ANTHROPIC_CONSTRAINTS

    def test_init_with_provider_string(self):
        """Test initialization with provider name string."""
        processor = FileProcessor(constraints="anthropic")

        assert processor.constraints == ANTHROPIC_CONSTRAINTS

    def test_init_with_unknown_provider(self):
        """Test initialization with unknown provider sets constraints to None."""
        processor = FileProcessor(constraints="unknown")

        assert processor.constraints is None

    def test_init_with_none_constraints(self):
        """Test initialization with None constraints."""
        processor = FileProcessor(constraints=None)

        assert processor.constraints is None


class TestFileProcessorValidate:
    """Tests for FileProcessor.validate method."""

    def test_validate_valid_file(self):
        """Test validating a valid file returns no errors."""
        processor = FileProcessor(constraints=ANTHROPIC_CONSTRAINTS)
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"))

        errors = processor.validate(file)

        assert len(errors) == 0

    def test_validate_without_constraints(self):
        """Test validating without constraints returns empty list."""
        processor = FileProcessor(constraints=None)
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"))

        errors = processor.validate(file)

        assert len(errors) == 0

    def test_validate_strict_raises_on_error(self):
        """Test STRICT mode raises on validation error."""
        constraints = ProviderConstraints(
            name="test",
            image=ImageConstraints(max_size_bytes=10),
        )
        processor = FileProcessor(constraints=constraints)
        # Set mode to strict on the file
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="strict")

        with pytest.raises(FileTooLargeError):
            processor.validate(file)


class TestFileProcessorProcess:
    """Tests for FileProcessor.process method."""

    def test_process_valid_file(self):
        """Test processing a valid file returns it unchanged."""
        processor = FileProcessor(constraints=ANTHROPIC_CONSTRAINTS)
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"))

        result = processor.process(file)

        assert result == file

    def test_process_without_constraints(self):
        """Test processing without constraints returns file unchanged."""
        processor = FileProcessor(constraints=None)
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"))

        result = processor.process(file)

        assert result == file

    def test_process_strict_raises_on_error(self):
        """Test STRICT mode raises on processing error."""
        constraints = ProviderConstraints(
            name="test",
            image=ImageConstraints(max_size_bytes=10),
        )
        processor = FileProcessor(constraints=constraints)
        # Set mode to strict on the file
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="strict")

        with pytest.raises(FileTooLargeError):
            processor.process(file)

    def test_process_warn_returns_file(self):
        """Test WARN mode returns file with warning."""
        constraints = ProviderConstraints(
            name="test",
            image=ImageConstraints(max_size_bytes=10),
        )
        processor = FileProcessor(constraints=constraints)
        # Set mode to warn on the file
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="warn")

        result = processor.process(file)

        assert result == file


class TestFileProcessorProcessFiles:
    """Tests for FileProcessor.process_files method."""

    def test_process_files_multiple(self):
        """Test processing multiple files."""
        processor = FileProcessor(constraints=ANTHROPIC_CONSTRAINTS)
        files = {
            "image1": ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test1.png")),
            "image2": ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test2.png")),
        }

        result = processor.process_files(files)

        assert len(result) == 2
        assert "image1" in result
        assert "image2" in result

    def test_process_files_empty(self):
        """Test processing empty files dict."""
        processor = FileProcessor(constraints=ANTHROPIC_CONSTRAINTS)

        result = processor.process_files({})

        assert result == {}


class TestFileHandlingEnum:
    """Tests for FileHandling enum."""

    def test_enum_values(self):
        """Test all enum values are accessible."""
        assert FileHandling.STRICT.value == "strict"
        assert FileHandling.AUTO.value == "auto"
        assert FileHandling.WARN.value == "warn"
        assert FileHandling.CHUNK.value == "chunk"


class TestFileProcessorPerFileMode:
    """Tests for per-file mode handling."""

    def test_file_default_mode_is_auto(self):
        """Test that files default to auto mode."""
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"))
        assert file.mode == "auto"

    def test_file_custom_mode(self):
        """Test setting custom mode on file."""
        file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="strict")
        assert file.mode == "strict"

    def test_processor_respects_file_mode(self):
        """Test processor uses each file's mode setting."""
        constraints = ProviderConstraints(
            name="test",
            image=ImageConstraints(max_size_bytes=10),
        )
        processor = FileProcessor(constraints=constraints)

        # File with strict mode should raise
        strict_file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="strict")
        with pytest.raises(FileTooLargeError):
            processor.process(strict_file)

        # File with warn mode should not raise
        warn_file = ImageFile(source=FileBytes(data=MINIMAL_PNG, filename="test.png"), mode="warn")
        result = processor.process(warn_file)
        assert result == warn_file