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

from apps.documents.forms import DocumentUploadForm
from apps.documents.models import UploadedDocument
from apps.documents.services import extract_text, index_document


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

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

    assert response.status_code == 200
    assert "文件已上传，可继续执行入库" in response.content.decode("utf-8")


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)


def test_document_upload_form_builds_scenario_choices():
    form = DocumentUploadForm()

    choice_values = [value for value, _label in form.fields["scenario_id"].choices]

    assert "knowledge_qa" in choice_values
    assert "quality_analysis" in choice_values


def test_index_failure_message_is_visible_on_document_list(client, db, monkeypatch):
    document = UploadedDocument.objects.create(
        scenario_id="knowledge_qa",
        original_name="broken.md",
        file_type="md",
        size=5,
        status="uploaded",
    )

    def fake_index_document(target_document):
        target_document.status = UploadedDocument.STATUS_FAILED
        target_document.error_message = "模拟入库失败"
        target_document.save(update_fields=["status", "error_message", "updated_at"])
        return target_document

    monkeypatch.setattr("apps.documents.views.index_document", fake_index_document)

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

    content = response.content.decode("utf-8")
    assert response.status_code == 200
    assert "文档入库失败，请检查错误原因后重试" in content
    assert "模拟入库失败" in content


def test_index_document_marks_failed_when_extracted_text_is_empty(db, monkeypatch):
    document = UploadedDocument.objects.create(
        scenario_id="knowledge_qa",
        original_name="empty.md",
        file_type="md",
        size=0,
        status="uploaded",
    )

    monkeypatch.setattr("apps.documents.services.extract_text", lambda target: "   ")

    updated_document = index_document(document)

    assert updated_document.status == UploadedDocument.STATUS_FAILED
    assert "文档内容为空" in updated_document.error_message