"""Unit tests for agent_team.transport.github_intake (§3.3.1, INTAKE poller).

Fully hermetic: both the GitHub issue client and the coordinator are injected
in-memory fakes, so no network call, token, GitHub SDK, or model is exercised.
The tests pin the poller's contract: a labeled issue creates exactly one task,
a re-poll does not double-ingest, unlabeled issues are never seen (the client
filters by label), and the intake text is the issue title + body.
"""

from __future__ import annotations

from typing import Any

import pytest

from agent_team.transport.github_intake import (
    GITHUB_TRANSPORT_NAME,
    GithubIntake,
    issue_task_text,
)

INTAKE_LABEL = "agent-team"


# --------------------------------------------------------------------------- #
# Fakes
# --------------------------------------------------------------------------- #


class FakeIssueClient:
    """In-memory ``GithubIssueClient`` returning only issues carrying ``label``.

    Mirrors the production client's contract: ``list_open_issues(label=...)``
    returns the subset of the configured issues whose ``labels`` include the
    requested label. Records each requested label so a test can assert the
    poller queries with the configured label.
    """

    def __init__(self, issues: list[dict[str, Any]]) -> None:
        self.issues = issues
        self.requested_labels: list[str] = []

    def list_open_issues(self, *, label: str) -> list[dict[str, Any]]:
        self.requested_labels.append(label)
        return [issue for issue in self.issues if label in (issue.get("labels") or [])]


class FakeCoordinator:
    """In-memory coordinator double recording every ``start_task`` call.

    Captures the keyword arguments of each call so a test can assert exactly one
    task was started, with the expected ``task_text`` / ``transport_name``.
    Returns a synthetic ``thread_id`` like the real coordinator.
    """

    def __init__(self) -> None:
        self.calls: list[dict[str, Any]] = []

    def start_task(self, *, task_text: str, transport_name: str) -> str:
        self.calls.append({"task_text": task_text, "transport_name": transport_name})
        return f"thread-{len(self.calls)}"


def _issue(
    issue_id: int,
    *,
    title: str = "Do the thing",
    body: str = "with details",
    labels: list[str] | None = None,
) -> dict[str, Any]:
    """Build a minimal GitHub-issue-shaped mapping for the fakes."""
    return {
        "id": issue_id,
        "number": issue_id,
        "title": title,
        "body": body,
        "labels": [INTAKE_LABEL] if labels is None else labels,
    }


# --------------------------------------------------------------------------- #
# issue_task_text
# --------------------------------------------------------------------------- #


def test_issue_task_text_joins_title_and_body() -> None:
    text = issue_task_text(_issue(1, title="Add poller", body="for GitHub intake"))
    assert text == "Add poller\n\nfor GitHub intake"


def test_issue_task_text_title_only_when_body_empty() -> None:
    assert issue_task_text(_issue(1, title="Title only", body="")) == "Title only"
    assert issue_task_text(_issue(1, title="Title only", body="   ")) == "Title only"


def test_issue_task_text_falls_back_to_id_when_title_empty() -> None:
    text = issue_task_text(_issue(42, title="", body=""))
    assert text == "issue #42"


def test_issue_task_text_strips_surrounding_whitespace() -> None:
    text = issue_task_text(_issue(1, title="  Trim me  ", body="\n body \n"))
    assert text == "Trim me\n\nbody"


# --------------------------------------------------------------------------- #
# GithubIntake construction
# --------------------------------------------------------------------------- #


def test_empty_label_is_rejected() -> None:
    with pytest.raises(ValueError):
        GithubIntake(
            client=FakeIssueClient([]), coordinator=FakeCoordinator(), label=""
        )


# --------------------------------------------------------------------------- #
# poll_once: the core contract
# --------------------------------------------------------------------------- #


def test_labeled_issue_creates_exactly_one_task() -> None:
    client = FakeIssueClient([_issue(1, title="Build it", body="now")])
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    ingested = intake.poll_once()

    assert ingested == ["1"]
    assert len(coordinator.calls) == 1
    call = coordinator.calls[0]
    assert call["task_text"] == "Build it\n\nnow"
    assert call["transport_name"] == GITHUB_TRANSPORT_NAME
    assert client.requested_labels == [INTAKE_LABEL]


def test_repoll_does_not_double_ingest() -> None:
    client = FakeIssueClient([_issue(1)])
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    first = intake.poll_once()
    second = intake.poll_once()

    assert first == ["1"]
    assert second == []  # already ingested -> no new task
    assert len(coordinator.calls) == 1
    assert intake.ingested_ids == frozenset({"1"})


def test_unlabeled_issues_are_ignored() -> None:
    client = FakeIssueClient(
        [
            _issue(1, labels=[INTAKE_LABEL]),
            _issue(2, labels=["bug"]),
            _issue(3, labels=[]),
        ]
    )
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    ingested = intake.poll_once()

    assert ingested == ["1"]
    assert len(coordinator.calls) == 1
    assert coordinator.calls[0]["task_text"].startswith("Do the thing")


def test_new_issue_on_second_poll_is_ingested() -> None:
    issues = [_issue(1)]
    client = FakeIssueClient(issues)
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    first = intake.poll_once()
    issues.append(_issue(2, title="Second", body="task"))
    second = intake.poll_once()

    assert first == ["1"]
    assert second == ["2"]
    assert len(coordinator.calls) == 2
    assert coordinator.calls[1]["task_text"] == "Second\n\ntask"


def test_multiple_labeled_issues_each_create_one_task() -> None:
    client = FakeIssueClient([_issue(1), _issue(2), _issue(3)])
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    ingested = intake.poll_once()

    assert ingested == ["1", "2", "3"]
    assert len(coordinator.calls) == 3


def test_id_falls_back_to_number_when_id_absent() -> None:
    issue = {"number": 7, "title": "No id", "body": "", "labels": [INTAKE_LABEL]}
    client = FakeIssueClient([issue])
    coordinator = FakeCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    ingested = intake.poll_once()

    assert ingested == ["7"]
    assert intake.poll_once() == []  # de-dup on number-derived id


def test_failed_start_task_leaves_issue_eligible_for_retry() -> None:
    """A raising start_task must NOT mark the issue ingested (no silent drop)."""

    class FlakyCoordinator:
        def __init__(self) -> None:
            self.attempts = 0

        def start_task(self, *, task_text: str, transport_name: str) -> str:
            self.attempts += 1
            if self.attempts == 1:
                raise RuntimeError("transient intake failure")
            return "thread-ok"

    client = FakeIssueClient([_issue(1)])
    coordinator = FlakyCoordinator()
    intake = GithubIntake(client=client, coordinator=coordinator, label=INTAKE_LABEL)

    with pytest.raises(RuntimeError):
        intake.poll_once()
    assert intake.ingested_ids == frozenset()  # not recorded -> retryable

    # The retry succeeds and ingests the issue exactly once.
    ingested = intake.poll_once()
    assert ingested == ["1"]
    assert coordinator.attempts == 2