"""End-to-end Confluence-stage tests through a compiled graph + SQLite checkpointer.

These drive the Confluence-writer sub-pipeline through the WHOLE graph wiring
composed by :func:`agent_team.graph.build_graph` (with ``confluence=True``), over
a REAL on-disk SQLite checkpointer so the durable suspend/resume can be proven
across a *fresh graph instance* that shares the same checkpoint DB. Only the
``billing.claude_invoke`` seam and the Confluence client are faked — no live
model, no Confluence, no network.

Coverage:

* **Flow A** — ``start_task(..., task_kind="confluence")`` routes INTAKE straight
  to CONF_DRAFT (NOT the clarifier), suspends at CONF_GATE; an ``approve`` resume
  drives CONF_WRITE -> END. The suspend persists across a brand-new graph object
  sharing the checkpointer DB, and a DUPLICATE resume against the now-settled
  thread is a no-op (the terminal state is unchanged).
* **Flow B** — the post-build documentation edge: when the build/verify subgraph
  is wired, the verifier's approved (PR) terminus feeds CONF_DRAFT. Exercised by
  graph STRUCTURE (the edge exists) rather than driving the heavy P3 stack.
* **Regression** — ``build_graph()`` with ``confluence=False`` wires NO conf_*
  nodes (the node set is unchanged), proving the flag gates the whole stage.
"""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any

import pytest

from agent_team import billing
from agent_team.billing import BillingMode, ClaudeResult
from agent_team.graph import (
    CLARIFY,
    CONF_DRAFT_NODE,
    CONF_GATE,
    CONF_WRITE_NODE,
    INTAKE,
    PLAN,
    build_graph,
    build_sqlite_checkpointer,
    get_pipeline_state,
    pending_question,
    resume_task,
    start_task,
)
from agent_team.task_model import Phase, PipelineState, TaskStatus

# A well-formed draft the faked Claude clarifier/drafter returns; conf_draft_node
# parses this JSON into the confluence_draft dict.
_VALID_DRAFT = {
    "title": "AWS Architecture Map — agent-team",
    "body_storage": "<p>The coordinator daemon runs on the R720.</p>",
    "page_id": "1540098",
}


# --------------------------------------------------------------------------- #
# Fixtures / fakes (mirror tests/test_confluence_writer.py + test_graph.py).
# --------------------------------------------------------------------------- #


@pytest.fixture(autouse=True)
def _restore_invoker():
    """Restore the billing module invoker after each test (mirrors siblings)."""
    original = billing._invoker
    yield
    billing._invoker = original


@pytest.fixture(autouse=True)
def _clear_apply_env(monkeypatch):
    """Ensure the live-write apply flag never leaks from the host environment."""
    monkeypatch.delenv("AGENT_TEAM_CONFLUENCE_APPLY", raising=False)


def _bind_invoker(reply: str) -> None:
    """Bind a fake Claude invoker returning ``reply`` (no live model)."""

    def _fake(prompt: str, *, mode: BillingMode, **kw: Any) -> ClaudeResult:
        return ClaudeResult(text=reply, mode=mode, usage={"input_tokens": 1})

    billing.set_invoker(_fake)


@pytest.fixture()
def sqlite_db(tmp_path: Path) -> Path:
    """A tmp SQLite checkpoint DB path (one per test)."""
    return tmp_path / "state" / "checkpoints.sqlite"


# --------------------------------------------------------------------------- #
# Flow A — direct Confluence doc task: INTAKE -> CONF_DRAFT (skip clarify).
# --------------------------------------------------------------------------- #


def test_flow_a_routes_intake_to_conf_draft_and_suspends_at_gate(
    sqlite_db: Path,
) -> None:
    """task_kind='confluence' skips the clarifier and suspends at the CONF_GATE.

    A direct documentation task routes INTAKE straight to CONF_DRAFT (NOT
    CLARIFY), drafts the page (faked Claude), and suspends on the Confluence
    human gate's ``interrupt()`` — proven by the pending interrupt's
    ``confluence_approval`` kind, NOT a clarifier question-set.
    """
    _bind_invoker(json.dumps(_VALID_DRAFT))
    cm = build_sqlite_checkpointer(sqlite_db)
    with cm as saver:
        graph = build_graph(checkpointer=saver, confluence=True)
        thread_id, state = start_task(
            graph, transport="slack", task="document the stack", task_kind="confluence"
        )

        # Suspended at the Confluence gate, not the clarifier.
        assert "__interrupt__" in state
        payload = pending_question(graph, thread_id=thread_id)
        assert payload is not None
        # The gate payload carries the confluence-approval kind + the draft. It
        # ALSO carries a ``question_set`` (the approve/request_changes/abandon
        # decision surface the coordinator delivers — mirroring the plan-decision
        # gate) whose context discriminator marks it as a confluence approval, so
        # it is NOT mistaken for a clarifier question-set.
        assert payload["kind"] == "confluence_approval"
        assert payload["question_set"].context.get("kind") == "confluence_approval"
        assert payload["confluence_draft"]["title"] == _VALID_DRAFT["title"]

        # The draft was reached WITHOUT visiting the clarifier (no qa_history).
        live = get_pipeline_state(graph, thread_id=thread_id)
        assert live.get("qa_history", []) == []
        assert live["task_kind"] == "confluence"


def test_flow_a_default_kind_still_routes_to_clarify(sqlite_db: Path) -> None:
    """The default (empty) task_kind still goes to the clarifier, not CONF_DRAFT.

    Proves route_after_intake only diverts ``confluence`` tasks — every other
    task keeps the original INTAKE -> CLARIFY behaviour even with the flag on.
    """
    _bind_invoker(json.dumps(_VALID_DRAFT))
    cm = build_sqlite_checkpointer(sqlite_db)
    with cm as saver:
        graph = build_graph(checkpointer=saver, confluence=True)
        thread_id, state = start_task(graph, transport="slack", task="do a thing")

        assert "__interrupt__" in state
        payload = pending_question(graph, thread_id=thread_id)
        assert payload is not None
        # A clarifier suspend: a question-set, no confluence kind.
        assert "question_set" in payload
        assert payload.get("kind") != "confluence_approval"


def test_flow_a_durable_suspend_resume_across_fresh_graph(sqlite_db: Path) -> None:
    """The Flow-A suspend persists across a NEW graph object sharing the DB.

    A first graph instance starts the task and suspends at the gate. A brand-new
    graph instance — same on-disk SQLite checkpointer, fresh compile — resumes the
    SAME thread with an ``approve`` decision, drives CONF_DRAFT -> CONF_GATE ->
    CONF_WRITE -> END, and the task settles DONE (dry-run write, nothing applied).
    This is the durability proof: only the shared checkpoint DB carries the state.
    """
    _bind_invoker(json.dumps(_VALID_DRAFT))

    # Instance #1: start + suspend at the gate, then drop the graph entirely.
    cm1 = build_sqlite_checkpointer(sqlite_db)
    with cm1 as saver1:
        graph1 = build_graph(checkpointer=saver1, confluence=True)
        thread_id, state1 = start_task(
            graph1, transport="slack", task="doc it", task_kind="confluence"
        )
        assert "__interrupt__" in state1
        assert pending_question(graph1, thread_id=thread_id) is not None

    # Instance #2: a FRESH checkpointer connection + freshly compiled graph over
    # the SAME DB file. It must see the suspended thread and resume it.
    cm2 = build_sqlite_checkpointer(sqlite_db)
    with cm2 as saver2:
        graph2 = build_graph(checkpointer=saver2, confluence=True)

        # The pending gate is visible purely from the shared checkpoint DB.
        resumed_payload = pending_question(graph2, thread_id=thread_id)
        assert resumed_payload is not None
        assert resumed_payload["kind"] == "confluence_approval"

        final = resume_task(
            graph2, thread_id=thread_id, answer={"decision": "approve", "notes": ""}
        )

        # CONF_WRITE ran (dry-run by default) and the task is terminal DONE.
        assert final["status"] == TaskStatus.DONE.value
        assert final["confluence_result"]["applied"] is False
        assert final["confluence_result"]["dry_run"] is True
        assert pending_question(graph2, thread_id=thread_id) is None


def test_flow_a_duplicate_resume_is_noop(sqlite_db: Path) -> None:
    """A DUPLICATE approve resume against the settled thread changes nothing.

    Once the gate is approved and the task settles DONE, replaying the same
    ``Command(resume=...)`` must NOT re-open the gate or mutate the terminal
    state — there is no open interrupt to consume, so it is an idempotent no-op.
    """
    _bind_invoker(json.dumps(_VALID_DRAFT))
    cm = build_sqlite_checkpointer(sqlite_db)
    with cm as saver:
        graph = build_graph(checkpointer=saver, confluence=True)
        thread_id, _ = start_task(
            graph, transport="slack", task="doc it", task_kind="confluence"
        )

        first = resume_task(
            graph, thread_id=thread_id, answer={"decision": "approve", "notes": ""}
        )
        assert first["status"] == TaskStatus.DONE.value
        first_result = first["confluence_result"]
        assert pending_question(graph, thread_id=thread_id) is None

        # Replay the same resume: no open gate -> no state change.
        second = resume_task(
            graph, thread_id=thread_id, answer={"decision": "approve", "notes": ""}
        )
        assert second["status"] == TaskStatus.DONE.value
        assert second["confluence_result"] == first_result
        assert pending_question(graph, thread_id=thread_id) is None


def test_flow_a_request_changes_loops_back_to_draft(sqlite_db: Path) -> None:
    """A request_changes decision loops the gate back to CONF_DRAFT (redraft).

    Proves the gate's revise route is wired CONF_GATE -> CONF_DRAFT: the task
    re-drafts (faked Claude again) and re-suspends at the gate, with the human
    feedback folded into state and the visit count bumped.
    """
    _bind_invoker(json.dumps(_VALID_DRAFT))
    cm = build_sqlite_checkpointer(sqlite_db)
    with cm as saver:
        graph = build_graph(checkpointer=saver, confluence=True)
        thread_id, _ = start_task(
            graph, transport="slack", task="doc it", task_kind="confluence"
        )

        state = resume_task(
            graph,
            thread_id=thread_id,
            answer={"decision": "request_changes", "notes": "tighten the intro"},
        )

        # Looped back through CONF_DRAFT and re-suspended at the gate.
        assert "__interrupt__" in state
        payload = pending_question(graph, thread_id=thread_id)
        assert payload is not None
        assert payload["kind"] == "confluence_approval"
        live = get_pipeline_state(graph, thread_id=thread_id)
        assert live["confluence_feedback"] == "tighten the intro"
        assert live["confluence_gate_visits"] >= 1


# --------------------------------------------------------------------------- #
# Flow B — post-build doc edge: approved-build terminus feeds CONF_DRAFT.
# --------------------------------------------------------------------------- #


def test_flow_b_approved_build_terminus_routes_into_conf_draft(
    restore_review_invoker_b,
) -> None:
    """When build_verify is wired with confluence=True, the verifier's approved
    (PR) terminus is repointed from END into CONF_DRAFT (Flow B).

    Exercised via graph STRUCTURE rather than driving the heavy P3 stack: we
    assert the VERIFY_NODE -> CONF_DRAFT edge exists (and that without
    confluence the same wiring lands VERIFY at END instead), which is the
    load-bearing Flow-B claim.
    """
    from agent_team.graph import VERIFY_NODE
    from agent_team.nodes import review_loop
    from agent_team.nodes.build_verify_subgraph import (
        make_build_node,
        make_verify_node,
        route_after_verify,
    )
    from agent_team.nodes.verifier import VerifierConfig

    review_loop.set_review_invoker(lambda prompt, **kw: "VERDICT: APPROVE\nok")
    build_verify = (
        make_build_node(diff_builder=lambda *, plan, config: "diff"),
        make_verify_node(VerifierConfig(expected_run_id="r1")),
        route_after_verify,
    )

    def _plan_to_review(state: PipelineState) -> PipelineState:
        return PipelineState(
            plan={"summary": "p"},
            current_phase=Phase.REVIEW.value,
            status=TaskStatus.ACTIVE.value,
        )

    graph = build_graph(
        live_plan_node=_plan_to_review,
        review_node=review_loop.bind_review_node(),
        route_review=review_loop.route_after_review,
        build_verify=build_verify,
        confluence=True,
    )

    g = graph.get_graph()
    nodes = set(g.nodes)
    assert {VERIFY_NODE, CONF_DRAFT_NODE, CONF_GATE, CONF_WRITE_NODE} <= nodes

    edges = {(e.source, e.target) for e in g.edges}
    # Flow B: the verifier's approved terminus feeds the Confluence draft so a
    # shipped change documents itself before the graph ends.
    assert (VERIFY_NODE, CONF_DRAFT_NODE) in edges


def test_flow_b_without_confluence_verify_terminus_is_not_conf_draft(
    restore_review_invoker_b,
) -> None:
    """With confluence=False, the same P3 wiring lands VERIFY at END, not the
    Confluence draft — the Flow-B repoint is gated on the flag."""
    from agent_team.graph import VERIFY_NODE
    from agent_team.nodes import review_loop
    from agent_team.nodes.build_verify_subgraph import (
        make_build_node,
        make_verify_node,
        route_after_verify,
    )
    from agent_team.nodes.verifier import VerifierConfig

    review_loop.set_review_invoker(lambda prompt, **kw: "VERDICT: APPROVE\nok")
    build_verify = (
        make_build_node(diff_builder=lambda *, plan, config: "diff"),
        make_verify_node(VerifierConfig(expected_run_id="r1")),
        route_after_verify,
    )

    def _plan_to_review(state: PipelineState) -> PipelineState:
        return PipelineState(
            plan={"summary": "p"},
            current_phase=Phase.REVIEW.value,
            status=TaskStatus.ACTIVE.value,
        )

    graph = build_graph(
        live_plan_node=_plan_to_review,
        review_node=review_loop.bind_review_node(),
        route_review=review_loop.route_after_review,
        build_verify=build_verify,
        confluence=False,
    )

    g = graph.get_graph()
    nodes = set(g.nodes)
    # No Confluence nodes exist, so the approved terminus cannot feed CONF_DRAFT.
    assert CONF_DRAFT_NODE not in nodes
    edges = {(e.source, e.target) for e in g.edges}
    assert (VERIFY_NODE, CONF_DRAFT_NODE) not in edges


@pytest.fixture()
def restore_review_invoker_b():
    """Save/restore the review-loop module-global invoker around Flow-B tests."""
    from agent_team.nodes import review_loop

    saved = review_loop._review_invoker
    yield
    review_loop._review_invoker = saved


# --------------------------------------------------------------------------- #
# Regression — confluence=False wires NO conf_* nodes (flag-gating).
# --------------------------------------------------------------------------- #


def test_confluence_disabled_wires_no_conf_nodes() -> None:
    """build_graph() with confluence off (the default) has NO conf_* vertices.

    The node set is byte-for-byte the P1 set (intake/clarify/plan); none of the
    Confluence stage exists, proving the entire sub-pipeline is flag-gated.
    """
    graph = build_graph()
    nodes = set(graph.get_graph().nodes)

    # The plain P1 nodes are present.
    assert {INTAKE, CLARIFY, PLAN} <= nodes
    # NONE of the Confluence vertices are wired.
    assert CONF_DRAFT_NODE not in nodes
    assert CONF_GATE not in nodes
    assert CONF_WRITE_NODE not in nodes
    assert not ({CONF_DRAFT_NODE, CONF_GATE, CONF_WRITE_NODE} & nodes)


def test_confluence_enabled_adds_exactly_the_conf_nodes() -> None:
    """Turning the flag on adds precisely the three Confluence vertices to the
    otherwise-unchanged P1 node set (no other topology drift)."""
    base_nodes = set(build_graph().get_graph().nodes)
    conf_nodes = set(build_graph(confluence=True).get_graph().nodes)

    added = conf_nodes - base_nodes
    assert added == {CONF_DRAFT_NODE, CONF_GATE, CONF_WRITE_NODE}