"""AH-023: end-to-end dynamic pricing refresh against a running TrackerServer.

Verifies the full path the issue's acceptance criteria demand: a curated
alias -> injected "live" fetch -> 80%-of-cheapest computed price ->
BillingLedger.set_price() -> preset metadata updated -> change logged and
queryable via GET /v1/pricing/hf/history. Also verifies the required
fallback: a preset with no hf_aliases is left completely alone.
"""

from __future__ import annotations

import json
import time
import urllib.error
import urllib.request

import pytest

from meshnet_tracker.billing import BillingLedger
from meshnet_tracker.server import TrackerServer

PRICED_MODEL = "zai-org/GLM-5.2"
STATIC_MODEL = "openai-community/gpt2"


def _row(repo: str, provider: str, input_price: str, output_price: str) -> str:
    return f"""
    <tr>
      <td><span title="{repo}">{repo}</span>
        <a href="/{repo}/?inference_api=true&amp;inference_provider={provider}">link</a>
      </td>
      <td>{provider}</td>
      <td>${input_price}</td>
      <td>${output_price}</td>
    </tr>
    """


FIXTURE_HTML = f"""
<table>
  {_row(PRICED_MODEL, "novita", "1.40", "4.40")}
  {_row(PRICED_MODEL, "deepinfra", "0.93", "3.00")}
</table>
"""


def _get_json(url: str, headers: dict | None = None) -> dict:
    req = urllib.request.Request(url, headers=headers or {})
    with urllib.request.urlopen(req) as r:
        return json.loads(r.read())


@pytest.fixture
def pricing_tracker(tmp_path):
    ledger = BillingLedger(starting_credit=0.0, default_price_per_1k=0.02)
    tracker = TrackerServer(
        model_presets={
            PRICED_MODEL: {
                "layers_start": 0,
                "layers_end": 11,
                "bytes_per_layer": {"bfloat16": 30 * 1024 * 1024},
                "hf_aliases": [PRICED_MODEL],
            },
            STATIC_MODEL: {
                "layers_start": 0,
                "layers_end": 11,
                "bytes_per_layer": {"bfloat16": 30 * 1024 * 1024},
            },
        },
        billing=ledger,
        validator_service_token="pricing-token",
        enable_hf_pricing=True,
        hf_pricing_log_db=str(tmp_path / "hf_pricing_log.sqlite"),
        hf_pricing_refresh_interval=0.05,
        hf_pricing_fetch_html=lambda url: FIXTURE_HTML,
    )
    port = tracker.start()
    tracker_url = f"http://127.0.0.1:{port}"
    yield tracker_url, ledger, tracker
    tracker.stop()


def _wait_for_price_change(ledger: BillingLedger, model: str, *, timeout: float = 2.0) -> float:
    deadline = time.time() + timeout
    while time.time() < deadline:
        price = ledger.price_for(model)
        if price != 0.02:
            return price
        time.sleep(0.02)
    raise AssertionError(f"price for {model!r} never changed from static default within {timeout}s")


def test_refresh_loop_repriced_model_with_curated_alias(pricing_tracker):
    tracker_url, ledger, tracker = pricing_tracker
    new_price = _wait_for_price_change(ledger, PRICED_MODEL)
    expected = round((0.93 + 3.00) / 2 / 1000 * 0.80, 6)
    assert new_price == expected

    preset = tracker._model_presets[PRICED_MODEL]
    assert preset["hf_last_price_per_1k"] == expected
    assert preset["hf_last_updated"]  # ISO timestamp string, non-empty


def test_refresh_loop_leaves_model_without_hf_aliases_on_static_price(pricing_tracker):
    tracker_url, ledger, tracker = pricing_tracker
    _wait_for_price_change(ledger, PRICED_MODEL)  # let the loop run at least once
    assert ledger.price_for(STATIC_MODEL) == 0.02
    assert "hf_last_price_per_1k" not in tracker._model_presets[STATIC_MODEL]


def test_price_history_requires_auth(pricing_tracker):
    tracker_url, ledger, tracker = pricing_tracker
    _wait_for_price_change(ledger, PRICED_MODEL)
    with pytest.raises(urllib.error.HTTPError) as exc_info:
        _get_json(f"{tracker_url}/v1/pricing/hf/history")
    assert exc_info.value.code == 401


def test_price_history_reports_old_new_source_and_timestamp(pricing_tracker):
    tracker_url, ledger, tracker = pricing_tracker
    _wait_for_price_change(ledger, PRICED_MODEL)
    result = _get_json(
        f"{tracker_url}/v1/pricing/hf/history?model={PRICED_MODEL}",
        headers={"Authorization": "Bearer pricing-token"},
    )
    assert len(result["changes"]) >= 1
    change = result["changes"][0]
    assert change["old_price_per_1k"] == 0.02
    assert change["new_price_per_1k"] == round((0.93 + 3.00) / 2 / 1000 * 0.80, 6)
    assert change["source_repo_id"] == PRICED_MODEL
    assert change["source_provider"] == "deepinfra"
    assert change["ts"] > 0


def test_price_history_filters_by_model(pricing_tracker):
    tracker_url, ledger, tracker = pricing_tracker
    _wait_for_price_change(ledger, PRICED_MODEL)
    result = _get_json(
        f"{tracker_url}/v1/pricing/hf/history?model={STATIC_MODEL}",
        headers={"Authorization": "Bearer pricing-token"},
    )
    assert result["changes"] == []