"""Unit tests for the KPI rollup math.

We exercise the pure functions (``_session_metrics`` and ``_aggregate_day``)
on hand-crafted session trajectories — no network, no HF Hub.
"""

import importlib.util
import sys
from pathlib import Path


def _load():
    """Load ``scripts/build_kpis.py`` without treating ``scripts`` as a package."""
    path = Path(__file__).parent.parent.parent / "scripts" / "build_kpis.py"
    spec = importlib.util.spec_from_file_location("build_kpis", path)
    mod = importlib.util.module_from_spec(spec)
    sys.modules["build_kpis"] = mod
    spec.loader.exec_module(mod)  # type: ignore
    return mod


def _ev(event_type, data=None, ts="2026-04-24T10:00:00"):
    return {"timestamp": ts, "event_type": event_type, "data": data or {}}


def _session(events, user_id="u1", start="2026-04-24T09:59:00"):
    return {
        "session_id": "sess-" + user_id,
        "session_start_time": start,
        "session_end_time": "2026-04-24T10:05:00",
        "model_name": "claude-opus-4-6",
        "messages": [{"role": "user", "content": "hi"}],
        "events": events,
        "user_id": user_id,
    }


def test_llm_call_accumulates_tokens_and_cost():
    mod = _load()
    events = [
        _ev(
            "llm_call",
            {
                "prompt_tokens": 100,
                "completion_tokens": 50,
                "cache_read_tokens": 40,
                "cache_creation_tokens": 10,
                "cost_usd": 0.01,
            },
        ),
        _ev(
            "llm_call",
            {
                "prompt_tokens": 200,
                "completion_tokens": 100,
                "cache_read_tokens": 80,
                "cost_usd": 0.02,
            },
        ),
    ]
    m = mod._session_metrics(_session(events))
    assert m["llm_calls"] == 2
    assert m["tokens_prompt"] == 300
    assert m["tokens_completion"] == 150
    assert m["tokens_cache_read"] == 120
    assert m["tokens_cache_creation"] == 10
    assert abs(m["cost_usd"] - 0.03) < 1e-9


def test_tool_success_rate_and_first_action():
    mod = _load()
    events = [
        _ev("tool_call", {"tool": "bash"}, ts="2026-04-24T10:00:05"),
        _ev("tool_output", {"success": True}),
        _ev("tool_output", {"success": False}),
    ]
    m = mod._session_metrics(_session(events))
    assert m["tool_calls_total"] == 2
    assert m["tool_calls_success"] == 1
    # 65s from start to first action
    assert m["first_tool_s"] == 65


def test_hf_job_gpu_hours():
    mod = _load()
    events = [
        _ev("hf_job_submit", {"flavor": "a100-large", "job_id": "j1"}),
        _ev(
            "hf_job_complete",
            {
                "flavor": "a100-large",
                "final_status": "COMPLETED",
                "wall_time_s": 3600,
            },
        ),
    ]
    m = mod._session_metrics(_session(events))
    assert m["hf_jobs_submitted"] == 1
    assert m["hf_jobs_succeeded"] == 1
    # a100-large = 1 gpu * 1 hour = 1 gpu-hour
    assert abs(m["_gpu_hours_by_flavor"]["a100-large"] - 1.0) < 1e-6


def test_hf_job_blocked_and_pro_clicks_are_counted():
    mod = _load()
    events = [
        _ev("jobs_access_blocked", {"tool_call_ids": ["tc1"], "plan": "free"}),
        _ev("pro_cta_click", {"source": "hf_jobs_upgrade_dialog"}),
        _ev("pro_cta_click", {"source": "claude_cap_dialog"}),
    ]
    m = mod._session_metrics(_session(events))
    assert m["hf_jobs_blocked"] == 1
    assert m["pro_cta_clicks"] == 2
    assert m["_pro_cta_by_source"] == {
        "hf_jobs_upgrade_dialog": 1,
        "claude_cap_dialog": 1,
    }


def test_pro_conversions_and_credits_topped_up_per_session():
    mod = _load()
    events = [
        _ev("pro_conversion", {"first_seen_at": "2026-04-20T10:00:00"}),
        _ev("credits_topped_up", {"namespace": "smolagents"}),
        _ev("credits_topped_up", {"namespace": "smolagents"}),
    ]
    m = mod._session_metrics(_session(events))
    assert m["pro_conversions"] == 1
    assert m["credits_topped_up"] == 2


def test_aggregate_sums_pro_conversions_and_credits_topped_up():
    mod = _load()
    s1 = mod._session_metrics(
        _session(
            [
                _ev("pro_conversion", {}),
            ],
            user_id="u1",
        )
    )
    s2 = mod._session_metrics(
        _session(
            [
                _ev("credits_topped_up", {"namespace": "ns"}),
            ],
            user_id="u2",
        )
    )
    s3 = mod._session_metrics(_session([], user_id="u3"))
    row = mod._aggregate([s1, s2, s3])
    assert row["pro_conversions"] == 1
    assert row["credits_topped_up"] == 1


def test_feedback_counts():
    mod = _load()
    events = [
        _ev("feedback", {"rating": "up"}),
        _ev("feedback", {"rating": "up"}),
        _ev("feedback", {"rating": "down"}),
    ]
    m = mod._session_metrics(_session(events))
    assert m["thumbs_up"] == 2
    assert m["thumbs_down"] == 1


def test_aggregate_day_cache_hit_and_users():
    mod = _load()
    s1 = mod._session_metrics(
        _session(
            [
                _ev(
                    "llm_call",
                    {"prompt_tokens": 100, "cache_read_tokens": 400, "cost_usd": 0.5},
                )
            ],
            user_id="u1",
        )
    )
    s2 = mod._session_metrics(
        _session(
            [
                _ev(
                    "llm_call",
                    {"prompt_tokens": 200, "cache_read_tokens": 100, "cost_usd": 1.0},
                )
            ],
            user_id="u2",
        )
    )
    row = mod._aggregate_day([s1, s2])
    assert row["sessions"] == 2
    assert row["users"] == 2
    assert row["tokens_prompt"] == 300
    assert row["tokens_cache_read"] == 500
    # 500 / (500 + 300) = 0.625
    assert abs(row["cache_hit_ratio"] - 0.625) < 1e-9
    assert abs(row["cost_usd"] - 1.5) < 1e-9


def test_per_tool_counts_in_session_metrics():
    mod = _load()
    events = [
        _ev("tool_call", {"tool": "bash"}),
        _ev("tool_call", {"tool": "bash"}),
        _ev("tool_call", {"tool": "research"}),
        _ev("tool_call", {"tool": "read"}),
        _ev("tool_call", {}),  # nameless tool_call must be ignored
    ]
    m = mod._session_metrics(_session(events, user_id="u1"))
    assert m["_tool_calls_by_name"] == {"bash": 2, "research": 1, "read": 1}
    assert m["_research_calls"] == 1
    assert m["_distinct_tools_used"] == 3
    assert m["_total_named_tool_calls"] == 4
    assert m["_model_name"] == "claude-opus-4-6"


def test_aggregate_research_kpis_only_count_doer_sessions():
    mod = _load()
    s1 = mod._session_metrics(
        _session(
            [
                _ev("tool_call", {"tool": "research"}),
                _ev("tool_call", {"tool": "research"}),
                _ev("tool_call", {"tool": "research"}),
            ],
            user_id="u1",
        )
    )
    s2 = mod._session_metrics(
        _session(
            [
                _ev("tool_call", {"tool": "research"}),
            ],
            user_id="u2",
        )
    )
    s3 = mod._session_metrics(
        _session(
            [
                _ev("tool_call", {"tool": "bash"}),
            ],
            user_id="u3",
        )
    )
    row = mod._aggregate([s1, s2, s3])
    assert row["sessions"] == 3
    assert row["sessions_with_research"] == 2
    assert row["research_calls"] == 4
    # Median among sessions that did any research = (1, 3) -> 2.0
    assert row["research_calls_per_session_p50"] == 2.0


def test_aggregate_tool_breadth_and_intensity():
    import json as _json

    mod = _load()
    s1 = mod._session_metrics(
        _session(
            [
                _ev("tool_call", {"tool": "bash"}),
                _ev("tool_call", {"tool": "research"}),
            ],
            user_id="u1",
        )
    )
    # Two user turns so calls/turn = 4/2 = 2
    s2 = _session(
        [
            _ev("tool_call", {"tool": "bash"}),
            _ev("tool_call", {"tool": "bash"}),
            _ev("tool_call", {"tool": "edit"}),
            _ev("tool_call", {"tool": "edit"}),
        ],
        user_id="u2",
    )
    s2["messages"] = [{"role": "user"}, {"role": "user"}]
    s2_metrics = mod._session_metrics(s2)
    row = mod._aggregate([s1, s2_metrics])
    assert _json.loads(row["tool_calls_by_name_json"]) == {
        "bash": 3,
        "research": 1,
        "edit": 2,
    }
    assert _json.loads(row["sessions_using_tool_json"]) == {
        "bash": 2,
        "research": 1,
        "edit": 1,
    }
    # u1: 2 distinct, u2: 2 distinct -> p50 = 2
    assert row["distinct_tools_per_session_p50"] == 2.0
    # tool_calls_per_session: u1=2, u2=4 -> p50=3
    assert row["tool_calls_per_session_p50"] == 3.0
    # u1: 2 turns(?) — _session() default has one user message, so calls/turn=2/1=2; u2=4/2=2
    assert row["tool_calls_per_turn_p50"] == 2.0


def test_breadth_intensity_percentiles_exclude_zero_tool_sessions():
    """Sessions that never called a tool would otherwise crush the median."""
    mod = _load()
    # Two productive sessions and three idle ones (no tool calls). Without
    # the doer-only filter, median of [0,0,0,2,4] = 0, which is useless.
    productive_a = mod._session_metrics(
        _session(
            [
                _ev("tool_call", {"tool": "bash"}),
                _ev("tool_call", {"tool": "research"}),
            ],
            user_id="prod_a",
        )
    )
    productive_b = _session(
        [
            _ev("tool_call", {"tool": "bash"}),
            _ev("tool_call", {"tool": "edit"}),
            _ev("tool_call", {"tool": "edit"}),
            _ev("tool_call", {"tool": "edit"}),
        ],
        user_id="prod_b",
    )
    productive_b["messages"] = [{"role": "user"}, {"role": "user"}]
    productive_b_metrics = mod._session_metrics(productive_b)
    idle = [
        mod._session_metrics(_session([], user_id="idle_a")),
        mod._session_metrics(_session([], user_id="idle_b")),
        mod._session_metrics(_session([], user_id="idle_c")),
    ]
    row = mod._aggregate([productive_a, productive_b_metrics, *idle])
    # Median of [2 distinct, 2 distinct] = 2 (idle sessions filtered).
    assert row["distinct_tools_per_session_p50"] == 2.0
    # Median of [2 calls, 4 calls] = 3 (idle sessions filtered).
    assert row["tool_calls_per_session_p50"] == 3.0


def test_pro_clicks_and_blocked_jobs_in_aggregate():
    """The aggregate row keeps pro_cta_clicks + hf_jobs_blocked columns
    even if the dashboard doesn't currently chart them — they're cheap to
    keep and downstream consumers may still depend on the schema."""
    mod = _load()
    s1 = mod._session_metrics(
        _session(
            [
                _ev("pro_cta_click", {"source": "hf_jobs_upgrade_dialog"}),
                _ev("pro_cta_click", {"source": "claude_cap_dialog"}),
                _ev("jobs_access_blocked", {}),
            ],
            user_id="u1",
        )
    )
    s2 = mod._session_metrics(
        _session(
            [
                _ev("jobs_access_blocked", {}),
                _ev("jobs_access_blocked", {}),
            ],
            user_id="u2",
        )
    )
    row = mod._aggregate([s1, s2])
    assert row["pro_cta_clicks"] == 2
    assert row["hf_jobs_blocked"] == 3


def test_aggregate_sessions_by_model_split():
    import json as _json

    mod = _load()
    s_anthropic = _session([], user_id="a")
    s_anthropic["model_name"] = "anthropic/claude-opus-4-6"
    s_bedrock = _session([], user_id="b")
    s_bedrock["model_name"] = "bedrock/us.anthropic.claude-opus-4-6-v1"
    s_bedrock2 = _session([], user_id="c")
    s_bedrock2["model_name"] = "bedrock/us.anthropic.claude-opus-4-6-v1"
    row = mod._aggregate(
        [
            mod._session_metrics(s_anthropic),
            mod._session_metrics(s_bedrock),
            mod._session_metrics(s_bedrock2),
        ]
    )
    assert _json.loads(row["sessions_by_model_json"]) == {
        "anthropic/claude-opus-4-6": 1,
        "bedrock/us.anthropic.claude-opus-4-6-v1": 2,
    }


def test_failure_and_regenerate_rates():
    mod = _load()
    s1 = mod._session_metrics(_session([_ev("error", {"error": "boom"})], user_id="a"))
    s2 = mod._session_metrics(_session([_ev("undo_complete")], user_id="b"))
    s3 = mod._session_metrics(_session([], user_id="c"))
    row = mod._aggregate_day([s1, s2, s3])
    assert row["failure_rate"] == round(1 / 3, 4)
    assert row["regenerate_rate"] == round(1 / 3, 4)


def test_window_filter_keeps_only_events_in_range():
    from datetime import datetime, timezone

    mod = _load()
    events = [
        _ev("llm_call", {"prompt_tokens": 100}, ts="2026-04-24T09:45:00"),
        _ev("llm_call", {"prompt_tokens": 200}, ts="2026-04-24T10:05:00"),
        _ev("tool_call", {"tool": "bash"}, ts="2026-04-24T10:30:00"),
        _ev("llm_call", {"prompt_tokens": 400}, ts="2026-04-24T11:10:00"),
    ]
    session = _session(events, start="2026-04-24T09:44:00")
    # Only events in [10:00, 11:00) should remain.
    window_start = datetime(2026, 4, 24, 10, 0, 0, tzinfo=timezone.utc)
    window_end = datetime(2026, 4, 24, 11, 0, 0, tzinfo=timezone.utc)
    windowed = mod._filter_session_to_window(session, window_start, window_end)
    assert windowed is not None
    types = [e["event_type"] for e in windowed["events"]]
    assert types == ["llm_call", "tool_call"]
    # Metrics only reflect in-window events.
    m = mod._session_metrics(windowed)
    assert m["tokens_prompt"] == 200
    assert m["llm_calls"] == 1
    assert m["tool_calls_total"] == 0  # tool_call not tool_output


def test_window_filter_returns_none_when_nothing_in_range():
    from datetime import datetime, timezone

    mod = _load()
    events = [_ev("llm_call", {"prompt_tokens": 100}, ts="2026-04-24T09:45:00")]
    session = _session(events)
    window_start = datetime(2026, 4, 24, 10, 0, 0, tzinfo=timezone.utc)
    window_end = datetime(2026, 4, 24, 11, 0, 0, tzinfo=timezone.utc)
    assert mod._filter_session_to_window(session, window_start, window_end) is None