from django.core.files.uploadedfile import SimpleUploadedFile
from django.urls import reverse

from apps.documents.models import UploadedDocument
from apps.documents.services import extract_text


def test_upload_txt_document_creates_uploaded_record(client, db):
    file = SimpleUploadedFile("rules.txt", "hello".encode("utf-8"), content_type="text/plain")

    response = client.post(
        reverse("documents:upload"),
        {"scenario_id": "knowledge_qa", "file": file},
    )

    assert response.status_code == 302
    document = UploadedDocument.objects.get()
    assert document.status == "uploaded"
    assert document.file_type == "txt"
    assert document.scenario_id == "knowledge_qa"


def test_upload_accepts_pdf_and_docx_documents(client, db):
    for filename, payload in [
        ("policy.pdf", b"%PDF-1.4\nplain policy text"),
        ("contract.docx", b"fake-docx-body"),
    ]:
        file = SimpleUploadedFile(filename, payload)

        response = client.post(
            reverse("documents:upload"),
            {"scenario_id": "knowledge_qa", "file": file},
        )

        assert response.status_code == 302

    assert set(UploadedDocument.objects.values_list("file_type", flat=True)) == {"pdf", "docx"}


def test_index_document_updates_status_to_indexed(client, db):
    document = UploadedDocument.objects.create(
        scenario_id="knowledge_qa",
        original_name="rules.md",
        file="knowledge_qa/rules.md",
        file_type="md",
        size=5,
        status="uploaded",
    )
    document.file.save("rules.md", SimpleUploadedFile("rules.md", b"# rule").file)

    response = client.post(reverse("documents:index", args=[document.id]))

    assert response.status_code == 302
    document.refresh_from_db()
    assert document.status == "indexed"
    assert document.error_message == ""


def test_extract_text_supports_pdf_and_docx_plain_text_fallback(db):
    pdf_document = UploadedDocument.objects.create(
        scenario_id="knowledge_qa",
        original_name="policy.pdf",
        file_type="pdf",
        size=10,
        status="uploaded",
    )
    pdf_document.file.save("policy.pdf", SimpleUploadedFile("policy.pdf", b"%PDF-1.4\nSafety policy"))

    docx_document = UploadedDocument.objects.create(
        scenario_id="knowledge_qa",
        original_name="contract.docx",
        file_type="docx",
        size=10,
        status="uploaded",
    )
    docx_document.file.save(
        "contract.docx",
        SimpleUploadedFile("contract.docx", b"Contract clause review"),
    )

    assert "Safety policy" in extract_text(pdf_document)
    assert "Contract clause review" in extract_text(docx_document)