"""Disk-driven menu helpers: cache-dir parsing + launch-recipe inference.

All offline — pure functions over a fake cache listing and fake config.json
dicts. The SSH scan, the menu merge, and the suggest endpoint that wire these
together are exercised by hand against the live cluster (mock-heavy unit tests of
those would test the mocks).
"""
import asyncio

from app import discovery
from app.config import Settings
from app.disk import DiskStatus, cache_dirname_to_repo, parse_cache_listing
from app.discovery import repo_to_key, infer_recipe, _detect_family
from app.models import load_catalog


# ---- cache dirname <-> repo ----

def test_cache_dirname_to_repo_roundtrip():
    assert cache_dirname_to_repo("models--RedHatAI--Qwen3.6-35B-A3B-NVFP4") == "RedHatAI/Qwen3.6-35B-A3B-NVFP4"


def test_cache_dirname_name_with_double_dash():
    # The org is the first segment; everything after is the name (single '/').
    assert cache_dirname_to_repo("models--org--weird--name") == "org/weird--name"


def test_cache_dirname_rejects_non_model_dirs():
    assert cache_dirname_to_repo("datasets--foo--bar") is None
    assert cache_dirname_to_repo("models--onlyorg") is None
    assert cache_dirname_to_repo("random") is None


# ---- parse_cache_listing ----

def test_parse_cache_listing_complete_and_incomplete():
    out = (
        "20000000000|1|models--RedHatAI--Qwen3.6-35B-A3B-NVFP4\n"
        "5000000000|0|models--some--half-downloaded\n"
        "\n"
        "garbage line with no pipes\n"
        "123|1|not-a-model-dir\n"
    )
    items = parse_cache_listing(out)
    assert items == [
        ("RedHatAI/Qwen3.6-35B-A3B-NVFP4", 20000000000, True),
        ("some/half-downloaded", 5000000000, False),
    ]


def test_parse_cache_listing_bad_size_defaults_zero():
    items = parse_cache_listing("notanumber|1|models--a--b")
    assert items == [("a/b", 0, True)]


# ---- repo_to_key ----

def test_repo_to_key_is_url_safe_and_stable():
    assert repo_to_key("RedHatAI/Qwen3.6-35B-A3B-NVFP4") == "redhatai-qwen3-6-35b-a3b-nvfp4"
    # Idempotent enough to be a stable id across calls.
    assert repo_to_key("nvidia/Gemma-4-26B-A4B-NVFP4") == "nvidia-gemma-4-26b-a4b-nvfp4"


# ---- family detection ----

def test_detect_qwen3_moe():
    cfg = {"architectures": ["Qwen3MoeForCausalLM"], "model_type": "qwen3_moe", "num_experts": 128}
    label, flags, caps = _detect_family(cfg)
    assert "--reasoning-parser=qwen3" in flags
    assert "--moe_backend=flashinfer_cutlass" in flags
    assert "reasoning" in caps
    assert "MoE" in label


def test_detect_gemma_moe_uses_marlin():
    cfg = {"architectures": ["Gemma4MoeForConditionalGeneration"], "model_type": "gemma4_moe", "num_local_experts": 8}
    label, flags, caps = _detect_family(cfg)
    assert "--reasoning-parser=gemma4" in flags
    assert "--tool-call-parser=gemma4" in flags
    assert "--moe_backend=marlin" in flags        # NOT flashinfer_cutlass — GB10 footgun
    assert "vision" in caps                         # ConditionalGeneration => multimodal
    assert "tools" in caps


def test_detect_generic_has_no_family_flags():
    label, flags, caps = _detect_family({"architectures": ["LlamaForCausalLM"], "model_type": "llama"})
    assert flags == []
    assert label == "Generic"


def test_detect_vision_from_config_keys():
    _, _, caps = _detect_family({"model_type": "qwen3", "vision_config": {"x": 1}})
    assert "vision" in caps


# ---- infer_recipe (the prefill the setup form receives) ----

def test_infer_recipe_solo_small_model():
    cfg = {"architectures": ["Qwen3ForCausalLM"], "model_type": "qwen3"}
    rec = infer_recipe("RedHatAI/Qwen3.6-35B-A3B-NVFP4", cfg, total_bytes=20_000_000_000, on_host_count=1)
    assert rec["mode"] == "solo"
    assert rec["key"] == "redhatai-qwen3-6-35b-a3b-nvfp4"
    assert rec["repo"] == "RedHatAI/Qwen3.6-35B-A3B-NVFP4"
    assert "--reasoning-parser=qwen3" in rec["vllm_args"]
    assert "-tp=2" not in rec["vllm_args"]
    assert rec["knobs"]["kv_cache_dtype"] == "fp8"


def test_infer_recipe_cluster_when_on_both_hosts():
    rec = infer_recipe("org/big", {}, total_bytes=10_000_000_000, on_host_count=2)
    assert rec["mode"] == "cluster"
    assert "-tp=2" in rec["vllm_args"]
    assert "--distributed-executor-backend=ray" in rec["vllm_args"]
    assert rec["knobs"]["gpu_memory_utilization"] == 0.7


def test_infer_recipe_cluster_when_too_big_for_one_spark():
    rec = infer_recipe("org/huge", {}, total_bytes=200_000_000_000, on_host_count=1)
    assert rec["mode"] == "cluster"


# ---- build_menu merge (disk scan ∪ recipes) ----

def _both_spark_settings(monkeypatch) -> Settings:
    for k in ("SPARK1_HOST", "SPARK1_USER", "SPARK2_HOST", "SPARK2_USER"):
        monkeypatch.delenv(k, raising=False)
    monkeypatch.setenv("SPARK1_HOST", "1.1.1.1")
    monkeypatch.setenv("SPARK1_USER", "u")
    monkeypatch.setenv("SPARK2_HOST", "2.2.2.2")
    monkeypatch.setenv("SPARK2_USER", "u")
    return Settings.from_env()


def test_build_menu_merges_recipe_discovered_and_hides_incomplete(monkeypatch):
    cat = load_catalog("models.yaml")  # bundled recipes incl. qwen36 + gemma4
    settings = _both_spark_settings(monkeypatch)

    async def fake_list(host, user, s):
        if host == "1.1.1.1":
            return [
                ("RedHatAI/Qwen3.6-35B-A3B-NVFP4", 20_000_000_000, True),  # recipe match
                ("someorg/mystery-7B", 7_000_000_000, True),               # needs setup
                ("broken/half", 1_000_000_000, False),                     # incomplete -> hidden
            ]
        return []  # spark2 empty

    async def fake_probe(repo, mode, s, *, local_path=None):
        return DiskStatus(repo=local_path or repo, on_disk=False, total_bytes=0, per_host=[])

    monkeypatch.setattr(discovery, "list_cached_models", fake_list)
    monkeypatch.setattr(discovery, "probe_disk", fake_probe)

    menu = asyncio.run(discovery.build_menu(settings, cat))

    # Recipe-matched: keyed by recipe key, ready (not needs_setup), real size.
    assert "qwen36" in menu
    assert menu["qwen36"]["needs_setup"] is False
    assert menu["qwen36"]["total_bytes"] == 20_000_000_000

    # Discovered-without-recipe: slug key, needs_setup.
    slug = repo_to_key("someorg/mystery-7B")
    assert menu[slug]["needs_setup"] is True

    # Incomplete download is filtered out entirely.
    assert all("half" not in k for k in menu)

    # A recipe with nothing on disk (e.g. gemma4) must NOT appear — the menu is the disk.
    assert "gemma4" not in menu


def test_build_menu_sums_cluster_model_across_both_sparks(monkeypatch):
    cat = load_catalog("models.yaml")
    settings = _both_spark_settings(monkeypatch)

    async def fake_list(host, user, s):
        # Same repo present on BOTH Sparks — one card, sizes summed (not two cards).
        return [("org/sharded-235B", 70_000_000_000, True)]

    async def fake_probe(repo, mode, s, *, local_path=None):
        return DiskStatus(repo=repo, on_disk=False, total_bytes=0, per_host=[])

    monkeypatch.setattr(discovery, "list_cached_models", fake_list)
    monkeypatch.setattr(discovery, "probe_disk", fake_probe)

    menu = asyncio.run(discovery.build_menu(settings, cat))
    key = repo_to_key("org/sharded-235B")
    assert list(menu) == [key]                       # exactly one card
    assert menu[key]["total_bytes"] == 140_000_000_000  # summed across both hosts
    assert len(menu[key]["per_host"]) == 2
    assert menu[key]["mode"] == "cluster"            # present on 2 hosts -> cluster