"""Tests für den Schlüssel-Proxy. Ausführen: python3 -m unittest discover -s tools/ki-proxy"""

from __future__ import annotations

import base64
import http.client
import json
import logging
import os
import sys
import threading
import unittest
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer

sys.path.insert(0, os.path.dirname(__file__))

import ki_proxy  # noqa: E402

KEYS = {"ki-bauin/itm-ki": "test-ki-schluessel", "ki-bauin/dataloader": "test-dl-schluessel", "ki-bauin/ocr": None}


class FakeUpstream(BaseHTTPRequestHandler):
    """Platzhalter für api-werk.de: merkt sich die letzte Anfrage."""

    protocol_version = "HTTP/1.1"
    last: dict = {}
    release_stream = threading.Event()

    def log_message(self, format, *args):  # noqa: A002
        return

    def _record(self) -> bytes:
        length = int(self.headers.get("Content-Length") or 0)
        body = self.rfile.read(length) if length else b""
        FakeUpstream.last = {"method": self.command, "path": self.path, "headers": dict(self.headers.items()), "body": body}
        return body

    def do_GET(self):
        self._record()
        if self.path.startswith("/v1/ki/stream"):
            self.send_response(200)
            self.send_header("Content-Type", "text/event-stream")
            self.send_header("Transfer-Encoding", "chunked")
            self.end_headers()
            self._chunk(b"data: erster\n\n")
            FakeUpstream.release_stream.wait(5)
            self._chunk(b"data: [DONE]\n\n")
            self.wfile.write(b"0\r\n\r\n")
            return
        status = 409 if self.path.startswith("/v1/dataloader/jobs/") else 200
        payload = json.dumps({"data": [{"id": "chat"}, {"id": "embed"}]}).encode()
        self.send_response(status)
        self.send_header("Content-Type", "application/json")
        self.send_header("Content-Length", str(len(payload)))
        self.end_headers()
        self.wfile.write(payload)

    def do_POST(self):
        body = self._record()
        payload = json.dumps({"job_id": "abc", "bytes": len(body)}).encode()
        self.send_response(202)
        self.send_header("Content-Type", "application/json")
        self.send_header("Content-Length", str(len(payload)))
        self.end_headers()
        self.wfile.write(payload)

    def _chunk(self, data: bytes) -> None:
        self.wfile.write(f"{len(data):x}\r\n".encode() + data + b"\r\n")
        self.wfile.flush()


class ProxyTest(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.upstream = ThreadingHTTPServer(("127.0.0.1", 0), FakeUpstream)
        threading.Thread(target=cls.upstream.serve_forever, daemon=True).start()
        upstream_url = f"http://127.0.0.1:{cls.upstream.server_address[1]}"
        cls.proxy = ki_proxy.start_servers(["127.0.0.1"], 0, dict(KEYS), upstream_url)[0]
        cls.port = cls.proxy.server_address[1]

    @classmethod
    def tearDownClass(cls):
        cls.proxy.shutdown()
        cls.upstream.shutdown()

    def setUp(self):
        FakeUpstream.last = {}
        FakeUpstream.release_stream.clear()
        self.logs = []
        handler = logging.Handler()
        handler.emit = lambda record: self.logs.append(record.getMessage())
        ki_proxy.log.addHandler(handler)
        ki_proxy.log.setLevel(logging.INFO)
        self.addCleanup(ki_proxy.log.removeHandler, handler)

    def request(self, method, path, body=None, headers=None):
        conn = http.client.HTTPConnection("127.0.0.1", self.port, timeout=10)
        conn.request(method, path, body=body, headers=headers or {})
        return conn, conn.getresponse()

    def test_setzt_den_schluessel_der_route_ein(self):
        conn, response = self.request("GET", "/v1/ki/models")
        self.assertEqual(200, response.status)
        self.assertEqual(["chat", "embed"], [m["id"] for m in json.loads(response.read())["data"]])
        self.assertEqual("Bearer test-ki-schluessel", FakeUpstream.last["headers"]["Authorization"])
        conn.close()

    def test_ueberschreibt_mitgeschickte_authorization(self):
        conn, response = self.request("GET", "/v1/ki/models", headers={"Authorization": "Bearer fremd"})
        response.read()
        self.assertEqual("Bearer test-ki-schluessel", FakeUpstream.last["headers"]["Authorization"])
        conn.close()

    def test_upload_kommt_unveraendert_an_mit_eigenem_schluessel(self):
        body = os.urandom(300_000)
        headers = {"Content-Type": "multipart/form-data; boundary=x"}
        conn, response = self.request("POST", "/v1/dataloader/jobs?x=1", body=body, headers=headers)
        self.assertEqual(202, response.status)
        self.assertEqual(len(body), json.loads(response.read())["bytes"])
        self.assertEqual(body, FakeUpstream.last["body"])
        self.assertEqual("/v1/dataloader/jobs?x=1", FakeUpstream.last["path"])
        self.assertEqual("Bearer test-dl-schluessel", FakeUpstream.last["headers"]["Authorization"])
        conn.close()

    def test_reicht_fehlerstatus_durch(self):
        conn, response = self.request("GET", "/v1/dataloader/jobs/abc/result?format=markdown")
        self.assertEqual(409, response.status)
        response.read()
        conn.close()

    def test_fehlender_schluessel_ergibt_503_ohne_weiterleitung(self):
        conn, response = self.request("GET", "/v1/ocr/jobs/abc")
        self.assertEqual(503, response.status)
        self.assertIn("ki-bauin/ocr", json.loads(response.read())["error"])
        self.assertEqual({}, FakeUpstream.last)
        conn.close()

    def test_unbekannter_pfad_ergibt_404(self):
        conn, response = self.request("GET", "/admin")
        self.assertEqual(404, response.status)
        response.read()
        self.assertEqual({}, FakeUpstream.last)
        conn.close()

    def test_streaming_kommt_sofort_an(self):
        conn, response = self.request("GET", "/v1/ki/stream")
        self.assertEqual(200, response.status)
        first = response.read1(1024)
        self.assertIn(b"erster", first)  # kommt an, bevor der Platzhalter den Rest freigibt
        self.assertNotIn(b"[DONE]", first)
        FakeUpstream.release_stream.set()
        rest = response.read()
        self.assertIn(b"[DONE]", rest)
        conn.close()

    def test_protokoll_enthaelt_keine_schluessel(self):
        for path in ("/v1/ki/models", "/v1/ocr/x", "/unbekannt"):
            conn, response = self.request("GET", path, headers={"Authorization": "Bearer fremd"})
            response.read()
            conn.close()
        self.assertTrue(self.logs)
        for line in self.logs:
            for secret in ("test-ki-schluessel", "test-dl-schluessel", "fremd", "Bearer"):
                self.assertNotIn(secret, line)


class TresorAusgabeTest(unittest.TestCase):
    def test_wertet_gefundene_und_fehlende_eintraege_aus(self):
        wert = base64.b64encode("zki_Äbc123".encode()).decode()
        output = f"ki-bauin/itm-ki\t{wert}\r\nki-bauin/ocr\t-\r\n"
        self.assertEqual({"ki-bauin/itm-ki": "zki_Äbc123", "ki-bauin/ocr": None}, ki_proxy.parse_tresor_output(output))

    def test_check_meldet_fehlende_schluessel_ohne_werte_auszugeben(self):
        logs = []
        handler = logging.Handler()
        handler.emit = lambda record: logs.append(record.getMessage())
        ki_proxy.log.addHandler(handler)
        try:
            code = ki_proxy.main(["--check"], reader=lambda targets: dict(KEYS))
        finally:
            ki_proxy.log.removeHandler(handler)
        self.assertEqual(1, code)
        joined = "\n".join(logs)
        self.assertIn("FEHLT", joined)
        self.assertNotIn("test-ki-schluessel", joined)


if __name__ == "__main__":
    unittest.main()