"""Feature 4: token / cost accounting tests.

Covers:
  * parse_usage_from_text on a REAL claude --output-format json result blob
    (captured live from CLI 2.1.142), including a leading text line.
  * parse on garbage / missing JSON -> None (never raises).
  * record_usage writes the columns; NULLs when usage is None.
  * fmt_tokens / fmt_cost formatting.
  * usage_comment string format.
  * task_usage_summary / task_summary_comment aggregate over agent_runs.

DB is an isolated temp file; no network or subprocess.
"""

import os
import tempfile

os.environ.setdefault("ORCH_PLANE_API_TOKEN", "test-token")
os.environ.setdefault("ORCH_GITEA_TOKEN", "test-token")

_test_db = os.path.join(tempfile.gettempdir(), "test_orchestrator_usage.db")
os.environ["ORCH_DB_PATH"] = _test_db

import pytest  # noqa: E402

from src import db as db_module  # noqa: E402
from src.db import init_db, get_db  # noqa: E402
from src import usage as U  # noqa: E402


# Real claude --output-format json result object (captured from CLI 2.1.142).
REAL_RESULT_JSON = (
    '{"type":"result","subtype":"success","is_error":false,"duration_ms":1795,'
    '"num_turns":1,"result":"Hi!","session_id":"abc",'
    '"total_cost_usd":0.0560175,'
    '"usage":{"input_tokens":45231,"cache_creation_input_tokens":7418,'
    '"cache_read_input_tokens":18500,"output_tokens":12100,'
    '"service_tier":"standard"},'
    '"modelUsage":{"claude-opus-4-7":{"inputTokens":6,"outputTokens":7}},'
    '"permission_denials":[]}'
)


@pytest.fixture(autouse=True)
def setup_db(monkeypatch):
    # get_db() reads settings.db_path live; pin it to our isolated DB.
    monkeypatch.setattr(db_module.settings, "db_path", _test_db, raising=False)
    if os.path.exists(_test_db):
        os.unlink(_test_db)
    init_db()
    yield
    if os.path.exists(_test_db):
        os.unlink(_test_db)


# --------------------------------------------------------------------------- #
# parsing
# --------------------------------------------------------------------------- #
def test_parse_real_result_json():
    u = U.parse_usage_from_text(REAL_RESULT_JSON)
    assert u is not None
    assert u["input_tokens"] == 45231
    assert u["output_tokens"] == 12100
    assert u["cache_read_tokens"] == 18500
    # FIX 2: cache_creation slice must now be parsed (was dropped before).
    assert u["cache_creation_tokens"] == 7418
    assert abs(u["cost_usd"] - 0.0560175) < 1e-9


def test_parse_cache_creation_present():
    u = U.parse_usage_from_text(REAL_RESULT_JSON)
    assert u["cache_creation_tokens"] == 7418


def test_parse_cache_creation_missing_defaults_zero():
    blob = (
        '{"total_cost_usd":0.01,'
        '"usage":{"input_tokens":10,"output_tokens":5,'
        '"cache_read_input_tokens":100}}'
    )
    u = U.parse_usage_from_text(blob)
    assert u["cache_creation_tokens"] == 0
    assert u["cache_read_tokens"] == 100


def test_parse_with_leading_text():
    """The agent may print text before the trailing JSON; we still find it."""
    text = "some agent stdout line\nanother line\n" + REAL_RESULT_JSON
    u = U.parse_usage_from_text(text)
    assert u is not None
    assert u["input_tokens"] == 45231
    assert u["output_tokens"] == 12100


def test_parse_garbage_returns_none():
    assert U.parse_usage_from_text("not json at all { broken") is None
    assert U.parse_usage_from_text("") is None
    assert U.parse_usage_from_text(None) is None


def test_parse_json_without_usage_returns_none():
    assert U.parse_usage_from_text('{"hello":"world"}') is None


def test_parse_from_log_missing_file_returns_none():
    assert U.parse_usage_from_log("/no/such/file.log") is None


# --------------------------------------------------------------------------- #
# record_usage
# --------------------------------------------------------------------------- #
def _new_run(agent="developer", task_id=1):
    conn = get_db()
    cur = conn.execute("INSERT INTO agent_runs (task_id, agent) VALUES (?, ?)", (task_id, agent))
    rid = cur.lastrowid
    conn.commit()
    conn.close()
    return rid


def test_record_usage_writes_columns():
    rid = _new_run()
    u = U.parse_usage_from_text(REAL_RESULT_JSON)
    U.record_usage(rid, u)
    conn = get_db()
    row = conn.execute(
        "SELECT input_tokens, output_tokens, cache_read_tokens, "
        "cache_creation_tokens, cost_usd "
        "FROM agent_runs WHERE id=?", (rid,)
    ).fetchone()
    conn.close()
    assert row["input_tokens"] == 45231
    assert row["output_tokens"] == 12100
    assert row["cache_read_tokens"] == 18500
    # FIX 2: cache_creation column is now persisted.
    assert row["cache_creation_tokens"] == 7418
    assert abs(row["cost_usd"] - 0.0560175) < 1e-9


def test_record_usage_none_writes_nulls():
    rid = _new_run()
    U.record_usage(rid, None)  # must not raise
    conn = get_db()
    row = conn.execute("SELECT input_tokens, cost_usd FROM agent_runs WHERE id=?", (rid,)).fetchone()
    conn.close()
    assert row["input_tokens"] is None
    assert row["cost_usd"] is None


# --------------------------------------------------------------------------- #
# formatting
# --------------------------------------------------------------------------- #
def test_fmt_tokens():
    assert U.fmt_tokens(6) == "6"
    assert U.fmt_tokens(1234) == "1.2k"
    assert U.fmt_tokens(45231) == "45.2k"
    assert U.fmt_tokens(2_500_000) == "2.5M"
    assert U.fmt_tokens(None) == "0"


def test_fmt_cost():
    assert U.fmt_cost(0.21) == "$0.21"
    assert U.fmt_cost(0.0560175) == "$0.06"
    assert U.fmt_cost(None) == "$0.00"


def test_usage_comment_format():
    # No cache -> in_total == input_tokens, no cached breakdown shown.
    u = {"input_tokens": 45231, "output_tokens": 12100, "cost_usd": 0.21}
    c = U.usage_comment("developer", u)
    assert "Developer" in c
    assert "45.2k in" in c
    assert "cached" not in c
    assert "12.1k out" in c
    assert "$0.21" in c


def test_usage_comment_shows_full_input_with_cached():
    """FIX 2: in = input + cache_read + cache_creation, with cached breakdown."""
    u = {
        "input_tokens": 81,
        "cache_read_tokens": 8_400_000,
        "cache_creation_tokens": 100_000,
        "output_tokens": 45_800,
        "cost_usd": 7.29,
    }
    c = U.usage_comment("developer", u)
    # total in = 8_500_081 -> 8.5M ; cached = 8_500_000 -> 8.5M
    assert "8.5M in (8.5M cached)" in c
    assert "45.8k out" in c
    assert "$7.29" in c


def test_usage_comment_no_cached_when_zero():
    u = {"input_tokens": 1234, "cache_read_tokens": 0,
         "cache_creation_tokens": 0, "output_tokens": 50, "cost_usd": 0.01}
    c = U.usage_comment("developer", u)
    assert "1.2k in" in c
    assert "cached" not in c


# --------------------------------------------------------------------------- #
# FIX 4: per-agent artifact links in finish comments
# --------------------------------------------------------------------------- #
def _ctx():
    return dict(repo="enduro-trails", branch="feature/ET-012-x",
               work_item_id="ET-012")


def test_usage_comment_reviewer_links_review_doc():
    c = U.usage_comment("reviewer", {"input_tokens": 5}, **_ctx())
    assert "12-review.md" in c
    assert "ET-012" in c


def test_usage_comment_tester_links_test_report():
    c = U.usage_comment("tester", {"input_tokens": 5}, **_ctx())
    assert "13-test-report.md" in c


def test_usage_comment_deployer_links_deploy_log():
    c = U.usage_comment("deployer", {"input_tokens": 5}, **_ctx())
    assert "14-deploy-log.md" in c


def test_usage_comment_developer_links_pr_and_branch():
    c = U.usage_comment("developer", {"input_tokens": 5}, pr_number=7, **_ctx())
    assert "pulls/7" in c
    assert "feature/ET-012-x" in c


def test_usage_comment_architect_links_adr():
    c = U.usage_comment("architect", {"input_tokens": 5}, **_ctx())
    assert "06-adr" in c


def test_usage_comment_no_links_without_context():
    """Without repo/branch context, no links are appended (no crash)."""
    c = U.usage_comment("reviewer", {"input_tokens": 5})
    assert "12-review.md" not in c
    assert "http" not in c


# --------------------------------------------------------------------------- #
# task summary
# --------------------------------------------------------------------------- #
def test_task_summary_aggregates_over_agents():
    # two runs for the same task: developer + tester
    for agent, ti, to, cost in [("developer", 1000, 200, 0.10), ("tester", 500, 100, 0.05)]:
        rid = _new_run(agent=agent, task_id=42)
        U.record_usage(rid, {"input_tokens": ti, "output_tokens": to,
                             "cache_read_tokens": 0, "cost_usd": cost})

    s = U.task_usage_summary(42)
    assert s["total_in"] == 1500
    assert s["total_out"] == 300
    assert abs(s["total_cost"] - 0.15) < 1e-9
    agents = {a for a, *_ in s["per_agent"]}
    assert agents == {"developer", "tester"}

    comment = U.task_summary_comment(42)
    assert "1.5k" in comment       # total in
    assert "$0.15" in comment       # total cost
    assert "Developer" in comment
    assert "Tester" in comment


def test_task_summary_sums_all_three_input_components():
    """FIX 2: total_in = SUM(input + cache_read + cache_creation); total_cached too."""
    rid = _new_run(agent="developer", task_id=77)
    U.record_usage(rid, {
        "input_tokens": 100,
        "cache_read_tokens": 2000,
        "cache_creation_tokens": 900,
        "output_tokens": 50,
        "cost_usd": 0.10,
    })
    rid2 = _new_run(agent="tester", task_id=77)
    U.record_usage(rid2, {
        "input_tokens": 10,
        "cache_read_tokens": 500,
        "cache_creation_tokens": 0,
        "output_tokens": 5,
        "cost_usd": 0.05,
    })
    s = U.task_usage_summary(77)
    # total_in = (100+2000+900) + (10+500+0) = 3510
    assert s["total_in"] == 3510
    # total_cached = (2000+900) + (500+0) = 3400
    assert s["total_cached"] == 3400
    assert s["total_out"] == 55
    comment = U.task_summary_comment(77)
    assert "cached" in comment


def test_task_summary_handles_null_cache_creation():
    """Pre-existing rows (NULL cache_creation) must not break aggregation."""
    rid = _new_run(agent="developer", task_id=88)
    conn = get_db()
    conn.execute(
        "UPDATE agent_runs SET input_tokens=100, cache_read_tokens=200, "
        "cache_creation_tokens=NULL, output_tokens=10, cost_usd=0.01 WHERE id=?",
        (rid,),
    )
    conn.commit()
    conn.close()
    s = U.task_usage_summary(88)  # must not raise
    assert s["total_in"] == 300   # 100 + 200 + (NULL->0)
    assert s["total_cached"] == 200