"""
Token passthrough test: update_task_status creates a token event on done.

Three-tier logic:
  Tier 1 — exact tokens_in/tokens_out provided
  Tier 2 — workplan_tokens_in/out provided → prorated by task count (note="workplan")
  Tier 3 — no token args, status=done → heuristic 1000/500 (note="heuristic")

Non-done status changes never create a token event.
"""
from __future__ import annotations

import pytest


async def _create_domain(client, slug="td"):
    r = await client.post("/domains/", json={"slug": slug, "name": "D"})
    assert r.status_code == 201, r.text
    return r.json()


async def _create_topic(client, domain_slug="td"):
    r = await client.post("/topics/", json={"slug": "tp", "title": "T", "domain": domain_slug})
    assert r.status_code == 201, r.text
    return r.json()


async def _create_workstream(client, topic_id):
    r = await client.post("/workstreams/", json={"topic_id": topic_id, "slug": "ws", "title": "WS"})
    assert r.status_code == 201, r.text
    return r.json()


async def _create_task(client, workstream_id, title="my task"):
    r = await client.post("/tasks/", json={"workstream_id": workstream_id, "title": title})
    assert r.status_code == 201, r.text
    return r.json()


@pytest.mark.asyncio
class TestTokenPassthrough:
    async def test_tier1_exact_tokens(self, client):
        """Tier 1: exact tokens_in/tokens_out → used as-is, no note."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={
            "status": "done",
            "tokens_in": 1200,
            "tokens_out": 800,
            "model": "claude-sonnet-4-6",
            "agent": "custodian",
        })
        assert r.status_code == 200
        assert r.json()["status"] == "done"

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert len(events) == 1
        ev = events[0]
        assert ev["tokens_in"] == 1200
        assert ev["tokens_out"] == 800
        assert ev["tokens_total"] == 2000
        assert ev["model"] == "claude-sonnet-4-6"
        assert ev["agent"] == "custodian"
        assert ev["workstream_id"] == ws["id"]
        assert ev["note"] == "measured"
        assert ev["measurement_kind"] == "measured"
        assert ev["source_provider"] == "manual"
        assert ev["source_id"] == f"task:{task['id']}:manual"

    async def test_tier1_userbased_note_override(self, client):
        """Tier 1 with note='userbased' records that note instead of 'measured'."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={
            "status": "done",
            "tokens_in": 500,
            "tokens_out": 200,
            "token_note": "userbased",
        })
        assert r.status_code == 200

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert events[0]["note"] == "userbased"
        assert events[0]["measurement_kind"] == "measured"

    async def test_tier2_workplan_prorated(self, client):
        """Tier 2: workplan totals prorated across 4 tasks → 250/125 each, note='workplan'."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        # Create 4 tasks; mark the first done with workplan totals
        task = await _create_task(client, ws["id"], "T1")
        for title in ["T2", "T3", "T4"]:
            await _create_task(client, ws["id"], title)

        r = await client.patch(f"/tasks/{task['id']}", json={
            "status": "done",
            "workplan_tokens_in": 1000,
            "workplan_tokens_out": 500,
        })
        assert r.status_code == 200

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert len(events) == 1
        ev = events[0]
        assert ev["tokens_in"] == 250   # 1000 // 4
        assert ev["tokens_out"] == 125  # 500 // 4
        assert ev["note"] == "workplan"
        assert ev["measurement_kind"] == "allocated"
        assert ev["raw_metadata"]["allocation_method"] == "workplan_prorated"

    async def test_tier3_heuristic_fallback(self, client):
        """Tier 3: status=done with no token args → heuristic 1000/500, note='heuristic'."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={"status": "done"})
        assert r.status_code == 200

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert len(events) == 1
        ev = events[0]
        assert ev["tokens_in"] == 1000
        assert ev["tokens_out"] == 500
        assert ev["note"] == "heuristic"
        assert ev["measurement_kind"] == "estimated"
        assert ev["source_provider"] == "task_fallback"

    async def test_suppress_token_event_skips_done_fallback(self, client):
        """File/cache sync can mark a task done without minting a heuristic event."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={
            "status": "done",
            "suppress_token_event": True,
        })
        assert r.status_code == 200
        assert r.json()["status"] == "done"

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert events == []

    async def test_repeated_done_update_does_not_duplicate_event(self, client):
        """Only the transition into done records token usage."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={"status": "done"})
        assert r.status_code == 200
        r = await client.patch(f"/tasks/{task['id']}", json={"status": "done"})
        assert r.status_code == 200

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert len(events) == 1

    async def test_non_done_status_creates_no_event(self, client):
        """Non-done status updates never create a token event."""
        await _create_domain(client)
        topic = await _create_topic(client)
        ws = await _create_workstream(client, topic["id"])
        task = await _create_task(client, ws["id"])

        r = await client.patch(f"/tasks/{task['id']}", json={"status": "progress"})
        assert r.status_code == 200

        events = (await client.get("/token-events/", params={"task_id": task["id"]})).json()
        assert events == []