"""Budget policy and accounting tests."""

import os
import sys
import json

ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), "..", "..", ".."))
sys.path.insert(0, os.path.join(ROOT, "pilot"))

from review.budget import Budget, BudgetState  # noqa: E402
from review import opencode_runtime  # noqa: E402
from review.opencode import parse_opencode_events  # noqa: E402


def test_budget_reads_config_over_environment(monkeypatch):
    monkeypatch.setenv("PRAGENT_MAX_REVIEW_STEPS", "3")
    budget = Budget.from_config({"budget": {"max_steps": 7}})
    assert budget.max_steps == 7


def test_budget_state_stops_at_token_limit():
    state = BudgetState(Budget(max_steps=20, max_total_tokens=100))
    assert state.record({"steps": 1, "total": 60, "output": 10}) == ""
    assert state.record({"steps": 1, "total": 40, "output": 10}) == "max_total_tokens"
    assert state.snapshot()["cap_hit"] is True


def test_budget_state_tracks_cost_cap():
    state = BudgetState(Budget(max_equivalent_cost_usd=1.0))
    assert state.record({"steps": 1, "total": 1}, 0.75) == ""
    assert state.record({"steps": 1, "total": 1}, 0.25) == "max_equivalent_cost_usd"


def test_process_terminates_after_step_budget():
    code = (
        "import json,time; "
        "print(json.dumps({'type':'step_finish','part':{'tokens':{"
        "'input':1,'output':1,'total':2}}}), flush=True); "
        "time.sleep(30)"
    )
    budget = Budget(max_steps=1, max_duration_seconds=10)
    state = BudgetState(budget)
    proc = opencode_runtime._run_process(
        [sys.executable, "-u", "-c", code], cwd=".", env=os.environ.copy(),
        timeout=10, parse_events=parse_opencode_events, budget=budget,
        budget_state=state, model="glm-5.2:cloud", runner=None,
    )
    assert state.snapshot()["cap_reason"] == "max_steps"
    assert proc.stdout.count("step_finish") == 1