from __future__ import annotations

from io import BytesIO

from docx import Document
from fastapi.testclient import TestClient

from app.main import create_app
from app.resume_import_models import ParsedResumeDraft
from app.resume_import_service import ResumeImportService
from app.services import RuleBasedEntryExpander, RuleBasedExperienceExtractor, RuleBasedResumeRewriter
from app.settings import Settings


BASE = "/ai-api/resume-agent"


class FakeResumeImportParser:
    def parse(self, *, text: str, source_name: str) -> ParsedResumeDraft:
        return ParsedResumeDraft(
            document={
                "schema_version": 3,
                "basics": {"name": "Imported Name", "phone": "13800138000", "email": "import@example.com"},
                "target": {"job_type": "campus", "position": "Backend Engineer"},
                "sections": [{"kind": "education", "heading": "Education", "items": [{"school": "Example University", "major": "Computer Science"}]}],
                "skill_groups": [{"category": "Programming Languages", "skills": ["Python"]}],
            },
            field_reviews=[],
        )


def docx_bytes(text: str) -> bytes:
    document = Document()
    document.add_paragraph(text)
    buffer = BytesIO()
    document.save(buffer)
    return buffer.getvalue()


def client_for_import(tmp_path) -> TestClient:
    application = create_app(
        database_path=tmp_path / "test.db",
        cors_origins=["http://localhost:5173"],
        extractor=RuleBasedExperienceExtractor(),
        rewriter=RuleBasedResumeRewriter(),
        expander=RuleBasedEntryExpander(),
        settings=Settings(llm_provider="rule", offerpai_auth_required=False),
        resume_import_service=ResumeImportService(storage_root=tmp_path / "imports", parser=FakeResumeImportParser()),
    )
    return TestClient(application)


def _active_component(body: dict) -> dict:
    turns = body.get("turns") or [body["turn"]]
    for turn in reversed(turns):
        for block in reversed(turn["blocks"]):
            if block["type"] == "component" and block["lifecycle"] == "active":
                return block
    raise AssertionError("response has no active component")


def _event(client: TestClient, session_id: str, body: dict, name: str, payload: dict | None = None):
    return client.post(
        f"{BASE}/sessions/{session_id}/component-events",
        json={"component_id": _active_component(body)["id"], "event": name, "payload": payload or {}},
    )


def import_session(client: TestClient) -> str:
    created = client.post(f"{BASE}/sessions", json={})
    session_id = created.json()["session_id"]
    source = _event(client, session_id, created.json(), "accept", {"accepted": True})
    selected = _event(client, session_id, source.json(), "select", {"value": "import"})
    assert selected.status_code == 200
    assert selected.json()["stage"] == "RESUME_IMPORT_UPLOAD"
    return session_id


def upload(client: TestClient, session_id: str, name: str = "resume.docx"):
    return client.post(
        f"{BASE}/sessions/{session_id}/resume-imports",
        files={"file": (name, docx_bytes("Imported Name\nExample University"), "application/vnd.openxmlformats-officedocument.wordprocessingml.document")},
    )


def test_import_requires_privacy_consent_and_import_selection(tmp_path) -> None:
    with client_for_import(tmp_path) as client:
        session_id = client.post(f"{BASE}/sessions", json={}).json()["session_id"]
        before_consent = upload(client, session_id)
        assert before_consent.status_code == 409
        assert before_consent.json()["error"]["code"] == "privacy_consent_required"

        timeline = client.get(f"{BASE}/sessions/{session_id}/timeline").json()
        source = _event(client, session_id, timeline, "accept", {"accepted": True})
        without_choice = upload(client, session_id)
        assert without_choice.status_code == 409
        assert without_choice.json()["error"]["code"] == "resume_import_not_selected"

        manual = _event(client, session_id, source.json(), "select", {"value": "manual"})
        assert manual.status_code == 200
        after_manual_choice = upload(client, session_id)
        assert after_manual_choice.status_code == 409
        assert after_manual_choice.json()["error"]["code"] == "resume_import_not_selected"


def test_docx_import_is_reviewable_and_apply_updates_live_resume(tmp_path) -> None:
    with client_for_import(tmp_path) as client:
        session_id = import_session(client)
        imported = upload(client, session_id)
        assert imported.status_code == 201, imported.text
        view = imported.json()
        assert view["status"] == "awaiting_review"

        applied = client.post(
            f"{BASE}/sessions/{session_id}/resume-imports/{view['id']}/apply",
            json={"expected_revision": 0},
        )
        assert applied.status_code == 200, applied.text
        body = applied.json()
        assert body["stage"] == "RESUME_ENRICHING"
        content = body["resume"]["content"]
        assert content["basics"]["name"] == "Imported Name"
        assert content["basics"]["masked_phone"] == "138****8000"
        assert "phone" not in content["basics"]
        assert content["basics"]["email"] == "import@example.com"
        assert content["sections"][0]["items"][0]["school"] == "Example University"


def test_import_is_blocked_after_an_imported_resume_is_applied(tmp_path) -> None:
    with client_for_import(tmp_path) as client:
        session_id = import_session(client)
        first_upload = upload(client, session_id)
        imported = first_upload.json()
        applied = client.post(
            f"{BASE}/sessions/{session_id}/resume-imports/{imported['id']}/apply",
            json={"expected_revision": 0},
        )
        assert applied.status_code == 200
        blocked = upload(client, session_id, "second.docx")
        assert blocked.status_code == 409
        assert blocked.json()["error"]["code"] == "resume_import_not_allowed"


def test_legacy_doc_and_scanned_pdf_return_stable_errors(tmp_path) -> None:
    with client_for_import(tmp_path) as client:
        session_id = import_session(client)
        legacy = client.post(f"{BASE}/sessions/{session_id}/resume-imports", files={"file": ("resume.doc", b"not-a-docx", "application/msword")})
        assert legacy.status_code == 422
        assert legacy.json()["error"]["code"] == "legacy_doc_unsupported"
        scanned = client.post(f"{BASE}/sessions/{session_id}/resume-imports", files={"file": ("scan.pdf", b"%PDF-1.7\n", "application/pdf")})
        assert scanned.status_code == 422
        assert scanned.json()["error"]["code"] == "ocr_required"


def test_imported_resume_continue_enriching_keeps_imported_content(tmp_path) -> None:
    with client_for_import(tmp_path) as client:
        session_id = import_session(client)
        imported = upload(client, session_id)
        applied = client.post(
            f"{BASE}/sessions/{session_id}/resume-imports/{imported.json()['id']}/apply",
            json={"expected_revision": 0},
        )
        assert applied.status_code == 200, applied.text
        before = applied.json()["resume"]["content"]

        continued = _event(client, session_id, applied.json(), "continue_enriching")
        assert continued.status_code == 200, continued.text
        body = continued.json()
        assert body["stage"] == "RESUME_ENRICHING"
        assert _active_component(body)["data"]["component"] == "custom_card_picker"
        assert body["resume"]["content"] == before