"""Unit coverage for SPEC-001 test-class requirements (ENV-10..12)."""

import json
import time
import unittest

from fjerkroa_bot.ai_responder import AIMessage, AIResponder

from .test_bdd_envelope import FakeModelResponder


def entry(channel: str, text: str = "x"):
    return {"role": "user", "content": json.dumps({"message": text, "channel": channel})}


class TestSystemPromptTemplate(unittest.TestCase):
    def test_dynamic_context_in_suffix(self):
        """ENV-10: date/memory reach the system message via the context suffix (ENV-20)."""
        config = {"system": "Date {date} memory {memory} news {news}", "history-limit": 5, "news": "/nonexistent/news.txt"}
        responder = AIResponder(config, "chat")
        responder.memory = "MEMSTR"
        messages = responder.message(AIMessage("alice", "hei"))
        system = messages[0]["content"]
        self.assertIn(time.strftime("%Y-%m-%d"), system)
        self.assertIn("MEMSTR", system)
        self.assertNotIn("{news}", system)  # placeholders stripped since ENV-20


class TestHistoryShrink(unittest.TestCase):
    def test_shrink_prefers_busy_channel(self):
        """ENV-11: entry from the channel exceeding history-per-channel is removed first."""
        config = {"system": "s", "history-limit": 4}
        responder = AIResponder(config, "chat")
        responder.history = [entry("a", "a0"), entry("a", "a1"), entry("a", "a2"), entry("a", "a3"), entry("b", "b0")]
        responder.shrink_history_by_one()
        self.assertEqual(len(responder.history), 4)
        self.assertNotIn("a0", responder.history[0]["content"])  # oldest busy-channel entry gone

    def test_shrink_falls_back_to_oldest(self):
        """ENV-11: when no channel exceeds the cap, the oldest entry overall is removed."""
        config = {"system": "s", "history-limit": 4}
        responder = AIResponder(config, "chat")
        responder.history = [entry("a", "a0"), entry("b", "b0"), entry("c", "c0")]
        responder.shrink_history_by_one()
        self.assertEqual(len(responder.history), 2)
        self.assertNotIn("a0", responder.history[0]["content"])


class TestRetriesExhausted(unittest.IsolatedAsyncioTestCase):
    async def test_send_raises_after_three_failures(self):
        """ENV-12: three model failures -> RuntimeError (revision pending in FDB-004/D1)."""
        responder = FakeModelResponder({"system": "s", "history-limit": 5}, "chat")
        # scripted list empty -> chat() returns None every attempt
        with self.assertRaises(RuntimeError):
            await responder.send(AIMessage("alice", "hei", "chat"))
        self.assertEqual(responder.chat_calls, 3)