"""Agent graph-growth: ``create_node`` action + relaxed agent-path caps.

Covers the validator (new action + same-batch edge resolution + cap threading),
the reducer (model_inferred node/claim + immediate visibility), and the
``apply_agent_actions`` density path (a multi-node turn beyond the legacy 4-action
cap actually lands).
"""

from __future__ import annotations

import time
import uuid

from loosecanvas import turn_logic
from loosecanvas.contracts import (
    Node,
    SceneAction,
    SceneActionType,
    ScenePlan,
    SceneState,
    SourceSnapshot,
)
from loosecanvas.graph_repository import LooseGraphRepository
from loosecanvas.reducer import reduce_turn
from loosecanvas.validator import validate_sceneplan

# ── Builders ──────────────────────────────────────────────────────────────────


def _node(node_id: str) -> Node:
    return Node(id=node_id, kind="concept", label=node_id)


def _graph(*node_ids: str) -> LooseGraphRepository:
    repo = LooseGraphRepository()
    repo.upsert_nodes([_node(nid) for nid in node_ids])
    return repo


def _scene(
    *, visible_nodes: list[str] | None = None, fogged: list[str] | None = None
) -> SceneState:
    return SceneState(
        visible_node_ids=visible_nodes or [], fogged_node_ids=fogged or []
    )


def _create_node(node_id: str, label: str, note: str = "") -> SceneAction:
    return SceneAction(
        type=SceneActionType.create_node, target_id=node_id, label=label, note=note
    )


# ── Validator: create_node ──────────────────────────────────────────────────


def test_create_node_valid() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    plan = ScenePlan(actions=[_create_node("concept::woody", "Woody Guthrie")])
    result = validate_sceneplan(plan, graph, scene)
    assert len(result.valid_actions) == 1
    assert result.rejected_actions == []


def test_create_node_missing_label_rejected() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    plan = ScenePlan(actions=[_create_node("concept::x", "")])
    result = validate_sceneplan(plan, graph, scene)
    assert len(result.rejected_actions) == 1
    assert "missing_required_field" in result.rejection_reasons[0]


def test_create_node_existing_id_rejected() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    plan = ScenePlan(actions=[_create_node("a", "Clobber")])
    result = validate_sceneplan(plan, graph, scene)
    assert len(result.rejected_actions) == 1
    assert "id_exists" in result.rejection_reasons[0]


def test_create_edge_resolves_node_created_earlier_in_same_plan() -> None:
    """A create_edge may reference a node create_node'd earlier in the same batch."""
    graph = _graph("dylan")
    scene = _scene(visible_nodes=["dylan"])
    plan = ScenePlan(
        actions=[
            _create_node("concept::woody", "Woody Guthrie"),
            SceneAction(
                type=SceneActionType.create_edge,
                source_id="concept::woody",
                target_id="dylan",
                label="influenced",
            ),
        ]
    )
    result = validate_sceneplan(plan, graph, scene)
    assert len(result.valid_actions) == 2
    assert result.rejected_actions == []


# ── Validator: cap threading ─────────────────────────────────────────────────


def test_default_action_cap_still_four() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    plan = ScenePlan(
        actions=[_create_node(f"concept::n{i}", f"N{i}") for i in range(6)]
    )
    result = validate_sceneplan(plan, graph, scene)
    # Legacy default unchanged: only the first 4 survive.
    assert len(result.valid_actions) == 4
    assert all("action_cap_exceeded" in r for r in result.rejection_reasons)


def test_raised_action_cap_admits_more() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    plan = ScenePlan(
        actions=[_create_node(f"concept::n{i}", f"N{i}") for i in range(6)]
    )
    result = validate_sceneplan(plan, graph, scene, max_actions=10)
    assert len(result.valid_actions) == 6
    assert result.rejected_actions == []


# ── Reducer: trust + visibility ──────────────────────────────────────────────


def test_create_node_emits_model_inferred_node_and_claim() -> None:
    graph = _graph("a")
    scene = _scene(visible_nodes=["a"])
    action = _create_node("concept::woody", "Woody Guthrie", note="Folk forefather")
    gp, sp, _events = reduce_turn([action], graph, scene)

    node = next(n for n in gp.upsert_nodes if n.id == "concept::woody")
    assert node.kind == "concept"
    assert node.label == "Woody Guthrie"
    assert node.summary == "Folk forefather"
    assert node.properties.get("origin") == "model_inferred"

    claim = next(c for c in gp.upsert_claims if c.target_id == "concept::woody")
    assert claim.origin == "model_inferred"
    assert claim.support_state == "unverified"
    assert claim.review_state == "pending"

    # The new node is immediately visible so the agent can wire edges to it.
    assert "concept::woody" in sp.add_visible_node_ids


def test_create_node_then_edge_reveals_edge_same_batch() -> None:
    graph = _graph("dylan")
    scene = _scene(visible_nodes=["dylan"])
    actions = [
        _create_node("concept::woody", "Woody Guthrie"),
        SceneAction(
            type=SceneActionType.create_edge,
            source_id="concept::woody",
            target_id="dylan",
            label="influenced",
        ),
    ]
    gp, sp, _events = reduce_turn(actions, graph, scene)
    assert "concept::woody" in sp.add_visible_node_ids
    new_edge = gp.upsert_edges[0]
    assert new_edge.id in sp.add_visible_edge_ids


# ── apply_agent_actions: density beyond the legacy cap ───────────────────────


def _make_session() -> str:
    repo = LooseGraphRepository.from_extraction(
        [Node(id="dylan", kind="concept", label="Bob Dylan")], [], [], SourceSnapshot()
    )
    scene = SceneState(scene_id="s1", visible_node_ids=["dylan"])
    sid = str(uuid.uuid4())
    now = time.time()
    turn_logic.session_store[sid] = turn_logic.SessionRecord(
        session_id=sid,
        graph=repo,
        scene=scene,
        history=[],
        graph_version=1,
        created_at=now,
        last_seen=now,
        render_scene_id="s1",
    )
    return sid


def test_apply_agent_actions_lands_dense_turn() -> None:
    sid = _make_session()
    record = turn_logic.session_store[sid]
    actions: list[SceneAction] = []
    for i in range(8):
        actions.append(_create_node(f"concept::n{i}", f"Concept {i}"))
        actions.append(
            SceneAction(
                type=SceneActionType.create_edge,
                source_id=f"concept::n{i}",
                target_id="dylan",
                label="relates to",
            )
        )
    turn_logic.apply_agent_actions(record, actions, {}, "building a dense web")
    # All 8 new concept nodes landed (legacy 4-action cap would have dropped most).
    for i in range(8):
        assert record.graph.get_node(f"concept::n{i}") is not None
    del turn_logic.session_store[sid]