"""Unit tests for agent_team.dispatcher — the trusted apply-path transport (§4.3).

Fully hermetic: the branch-push and workflow-dispatch side effects are injected
fakes, so no git, no ``gh``, and no network are exercised. The tests pin the
pure input-assembly + validation contract and the push-before-dispatch order.
"""

from __future__ import annotations

import base64

import pytest

from agent_team.dispatcher import (
    MAX_DIFF_BYTES,
    DispatcherError,
    DispatchInputs,
    DispatchResult,
    app_branch_pusher,
    app_run_locator,
    app_workflow_dispatcher,
    build_dispatch_inputs,
    dispatch_apply_verify,
    head_branch_for,
    run_name_for,
    select_run_id,
)
from agent_team.state_store import compute_content_hash

TASK = "0a1b2c3d4e5f6071"
DIFF = "diff --git a/README.md b/README.md\n--- a/README.md\n+++ b/README.md\n@@ -1 +1,2 @@\n title\n+added line\n"
SCOPE = "README.md\ndocs/**"


# --------------------------------------------------------------------------- #
# build_dispatch_inputs (pure)
# --------------------------------------------------------------------------- #


def test_build_dispatch_inputs_binds_hash_and_b64() -> None:
    di = build_dispatch_inputs(task_id=TASK, diff_text=DIFF, declared_scope=SCOPE)
    # expected_diff_hash is the plain sha256 the workflow's sha256sum reproduces.
    assert di.expected_diff_hash == compute_content_hash(DIFF.encode("utf-8"))
    # diff_b64 round-trips back to the exact diff bytes.
    assert base64.b64decode(di.diff_b64).decode("utf-8") == DIFF
    assert di.head_branch == f"agent-team/apply/{TASK}"
    assert di.diff_artifact_name == f"agent-team-diff-{TASK}"
    assert di.declared_scope == SCOPE


def test_as_inputs_keys_match_the_six_workflow_inputs() -> None:
    di = build_dispatch_inputs(task_id=TASK, diff_text=DIFF, declared_scope=SCOPE)
    assert set(di.as_inputs()) == {
        "task_id",
        "diff_artifact_name",
        "expected_diff_hash",
        "declared_scope",
        "diff_b64",
        "head_branch",
    }


@pytest.mark.parametrize("bad_diff", ["", "   ", "\n\n"])
def test_empty_diff_rejected(bad_diff: str) -> None:
    with pytest.raises(DispatcherError):
        build_dispatch_inputs(task_id=TASK, diff_text=bad_diff, declared_scope=SCOPE)


def test_oversized_diff_rejected() -> None:
    # The diff rides a base64 workflow_dispatch input (GitHub ~64 KB cap); a diff
    # over MAX_DIFF_BYTES must fail closed in the dispatcher, not be dispatched.
    big = "diff --git a/x b/x\n" + "+" + ("x" * (MAX_DIFF_BYTES + 1)) + "\n"
    with pytest.raises(DispatcherError):
        build_dispatch_inputs(task_id=TASK, diff_text=big, declared_scope=SCOPE)


@pytest.mark.parametrize("bad_scope", ["", "   "])
def test_empty_scope_rejected(bad_scope: str) -> None:
    # An empty declared scope would let a diff touch ANY path — fail closed.
    with pytest.raises(DispatcherError):
        build_dispatch_inputs(task_id=TASK, diff_text=DIFF, declared_scope=bad_scope)


@pytest.mark.parametrize(
    "bad_task", ["", "has space", "semi;colon", "../escape", "a/b", "x" * 201]
)
def test_unsafe_task_id_rejected(bad_task: str) -> None:
    with pytest.raises(DispatcherError):
        head_branch_for(bad_task)
    with pytest.raises(DispatcherError):
        build_dispatch_inputs(task_id=bad_task, diff_text=DIFF, declared_scope=SCOPE)


# --------------------------------------------------------------------------- #
# dispatch_apply_verify (injected seams)
# --------------------------------------------------------------------------- #


class _Recorder:
    def __init__(self) -> None:
        self.calls: list[dict] = []


def test_dispatch_pushes_then_fires_with_correct_inputs() -> None:
    order: list[str] = []
    pushed = _Recorder()
    fired = _Recorder()

    def pusher(*, owner, repo, base, head_branch, diff_text):
        order.append("push")
        pushed.calls.append(
            {
                "owner": owner,
                "repo": repo,
                "base": base,
                "head": head_branch,
                "diff": diff_text,
            }
        )

    def dispatcher(*, owner, repo, inputs, ref):
        order.append("dispatch")
        fired.calls.append({"owner": owner, "repo": repo, "inputs": inputs, "ref": ref})

    located = _Recorder()

    def locator(*, owner, repo, task_id, since_iso):
        order.append("locate")
        located.calls.append(
            {"owner": owner, "repo": repo, "task_id": task_id, "since_iso": since_iso}
        )
        return "27990718108"

    result = dispatch_apply_verify(
        owner="Sea-Haven-Industries",
        repo="orchestrator",
        task_id=TASK,
        diff_text=DIFF,
        declared_scope=SCOPE,
        pusher=pusher,
        dispatcher=dispatcher,
        locator=locator,
    )

    assert isinstance(result, DispatchResult)
    assert isinstance(result.inputs, DispatchInputs)
    # run_id is captured from the locator and surfaced for the verifier.
    assert result.run_id == "27990718108"
    assert result.correlation_tag == TASK
    assert result.dispatched_at  # stamped, non-empty
    # Push BEFORE dispatch BEFORE locate (the run can only be located after it is
    # triggered, and the branch must exist before the run reaches the PR step).
    assert order == ["push", "dispatch", "locate"]
    assert pushed.calls[0]["head"] == f"agent-team/apply/{TASK}"
    assert pushed.calls[0]["diff"] == DIFF
    # The dispatch carries all six inputs, including the b64 diff + head branch.
    inputs = fired.calls[0]["inputs"]
    assert inputs["head_branch"] == f"agent-team/apply/{TASK}"
    assert base64.b64decode(inputs["diff_b64"]).decode("utf-8") == DIFF
    assert inputs["expected_diff_hash"] == compute_content_hash(DIFF.encode("utf-8"))
    assert fired.calls[0]["ref"] == "main"
    # The locator is keyed by THIS task and the dispatched-at watermark.
    assert located.calls[0]["task_id"] == TASK
    assert located.calls[0]["since_iso"] == result.dispatched_at


def test_dispatch_returns_none_run_id_when_locator_cannot_resolve() -> None:
    # A fired-but-unlocatable run fails closed (None run_id); never raises here.
    result = dispatch_apply_verify(
        owner="o",
        repo="r",
        task_id=TASK,
        diff_text=DIFF,
        declared_scope=SCOPE,
        pusher=lambda **_k: None,
        dispatcher=lambda **_k: None,
        locator=lambda **_k: None,
    )
    assert isinstance(result, DispatchResult)
    assert result.run_id is None
    assert result.dispatched_at  # still stamped for the CI-watch timeout


def test_run_name_for_matches_workflow_run_name_convention() -> None:
    # Mirrors run-name: "agent-team-apply ${{ inputs.task_id }}" in the workflow.
    assert run_name_for(TASK) == f"agent-team-apply {TASK}"


def test_dispatch_does_not_fire_if_push_fails() -> None:
    fired = _Recorder()

    def failing_pusher(**_kw):
        raise RuntimeError("push failed")

    def dispatcher(**kw):
        fired.calls.append(kw)

    with pytest.raises(RuntimeError):
        dispatch_apply_verify(
            owner="o",
            repo="r",
            task_id=TASK,
            diff_text=DIFF,
            declared_scope=SCOPE,
            pusher=failing_pusher,
            dispatcher=dispatcher,
        )
    # A failed push must NOT dispatch a run (no orphan run against a missing head).
    assert fired.calls == []


@pytest.mark.parametrize(
    "owner,repo", [("", "r"), ("o", ""), ("bad owner", "r"), ("o", "r/x")]
)
def test_unsafe_owner_repo_rejected(owner: str, repo: str) -> None:
    with pytest.raises(DispatcherError):
        dispatch_apply_verify(
            owner=owner,
            repo=repo,
            task_id=TASK,
            diff_text=DIFF,
            declared_scope=SCOPE,
            pusher=lambda **_k: None,
            dispatcher=lambda **_k: None,
        )


# --------------------------------------------------------------------------- #
# select_run_id (pure; anti-stale on rapid re-dispatch of the SAME task_id)
# --------------------------------------------------------------------------- #


def _row(db_id, *, created, status="completed", conclusion=None):
    """A minimal ``gh run list`` row for the apply/verify run-name of TASK."""
    return {
        "databaseId": db_id,
        "name": run_name_for(TASK),
        "createdAt": created,
        "status": status,
        "conclusion": conclusion,
    }


def test_select_run_id_skips_cancelled_prior_run_on_re_dispatch() -> None:
    # Rapid re-dispatch of the SAME task_id: the concurrency group cancelled the
    # OLDER run, and a NEWER run is now in progress. We must bind to the newer,
    # active run — never the older cancelled one (it carries the prior verdict).
    older_cancelled = _row(
        100, created="2026-06-23T10:00:00Z", status="completed", conclusion="cancelled"
    )
    newer_active = _row(
        200, created="2026-06-23T10:05:00Z", status="in_progress", conclusion=None
    )
    runs = [newer_active, older_cancelled]
    chosen = select_run_id(runs, task_id=TASK, floor_iso="2026-06-23T09:58:00Z")
    assert chosen == "200"


def test_select_run_id_skips_cancelled_even_when_it_is_newest() -> None:
    # Defensive: a cancelled run is NEVER selected even if its createdAt is the
    # greatest — it is the superseded run, not ours.
    active = _row(300, created="2026-06-23T10:00:00Z", status="queued", conclusion=None)
    newest_cancelled = _row(
        400, created="2026-06-23T10:10:00Z", status="completed", conclusion="cancelled"
    )
    runs = [active, newest_cancelled]
    chosen = select_run_id(runs, task_id=TASK, floor_iso="2026-06-23T09:58:00Z")
    assert chosen == "300"


def test_select_run_id_prefers_newest_active_over_older_completed() -> None:
    # An older legitimately-completed run plus a newer active run -> the active,
    # newest run wins (the freshly-triggered one with no conclusion yet).
    older_done = _row(
        500, created="2026-06-23T10:00:00Z", status="completed", conclusion="success"
    )
    newer_active = _row(
        600, created="2026-06-23T10:05:00Z", status="in_progress", conclusion=None
    )
    chosen = select_run_id(
        [older_done, newer_active], task_id=TASK, floor_iso="2026-06-23T09:58:00Z"
    )
    assert chosen == "600"


def test_select_run_id_falls_back_to_newest_non_cancelled_when_none_active() -> None:
    # No active runs (e.g. a fast run already concluded by the time we poll):
    # fall back to the newest NON-cancelled run overall.
    older = _row(
        700, created="2026-06-23T10:00:00Z", status="completed", conclusion="success"
    )
    newer = _row(
        800, created="2026-06-23T10:05:00Z", status="completed", conclusion="failure"
    )
    cancelled = _row(
        900, created="2026-06-23T10:09:00Z", status="completed", conclusion="cancelled"
    )
    chosen = select_run_id(
        [older, newer, cancelled], task_id=TASK, floor_iso="2026-06-23T09:58:00Z"
    )
    assert chosen == "800"


def test_select_run_id_respects_created_floor_and_run_name() -> None:
    # Below-floor runs and other-task runs are not matched.
    below_floor = _row(
        1000, created="2026-06-23T09:00:00Z", status="in_progress", conclusion=None
    )
    other_task = {
        "databaseId": 1100,
        "name": "agent-team-apply other-task",
        "createdAt": "2026-06-23T10:00:00Z",
        "status": "in_progress",
        "conclusion": None,
    }
    assert (
        select_run_id(
            [below_floor, other_task], task_id=TASK, floor_iso="2026-06-23T09:58:00Z"
        )
        is None
    )


def test_select_run_id_returns_none_when_only_cancelled_matches() -> None:
    # If the only matching run is cancelled, there is nothing to bind to -> None
    # (the caller fails closed: no run_id -> verify BLOCKs/parks).
    only_cancelled = _row(
        1200, created="2026-06-23T10:00:00Z", status="completed", conclusion="cancelled"
    )
    assert (
        select_run_id([only_cancelled], task_id=TASK, floor_iso="2026-06-23T09:58:00Z")
        is None
    )


# --------------------------------------------------------------------------- #
# app_branch_pusher (App-token git seam; secret hygiene)
# --------------------------------------------------------------------------- #


class _StubTokenProvider:
    """Minimal token provider: returns a fixed installation token."""

    def __init__(self, token: str = "ghs_TESTTOKEN") -> None:
        self._token = token

    def token(self) -> str:
        return self._token


def test_app_branch_pusher_keeps_token_out_of_argv_and_uses_plain_remote() -> None:
    # The clone must use the PLAIN HTTPS remote (no token in the URL/argv), and
    # the installation token must be injected via http.extraHeader through git's
    # GIT_CONFIG_* env vars on the network steps (clone + push) — never in argv.
    recorded: list[dict] = []

    def fake_run(cmd, *, cwd=None, env=None):
        recorded.append({"cmd": list(cmd), "env": env})

    push = app_branch_pusher(_StubTokenProvider(), _run=fake_run)
    push(
        owner="owner",
        repo="repo",
        base="main",
        head_branch="agent-team/apply/abc",
        diff_text=DIFF,
    )

    clone_cmd = recorded[0]["cmd"]
    assert "clone" in clone_cmd
    assert "https://github.com/owner/repo.git" in clone_cmd
    # The token NEVER appears in any git argv element.
    for call in recorded:
        for arg in call["cmd"]:
            assert "ghs_TESTTOKEN" not in arg

    # Auth rides in GIT_CONFIG_* env on the network steps only (clone + push), as
    # BASIC auth (username x-access-token) — git smart-HTTP rejects Bearer.
    expected_basic = "Authorization: Basic " + base64.b64encode(
        b"x-access-token:ghs_TESTTOKEN"
    ).decode("ascii")
    clone_env = recorded[0]["env"]
    assert clone_env["GIT_CONFIG_KEY_0"] == "http.https://github.com/.extraHeader"
    assert clone_env["GIT_CONFIG_VALUE_0"] == expected_basic
    push_env = recorded[-1]["env"]
    assert push_env["GIT_CONFIG_VALUE_0"] == expected_basic
    # The raw token never appears literally in the auth header (it is base64'd).
    assert "ghs_TESTTOKEN" not in clone_env["GIT_CONFIG_VALUE_0"]
    # The non-network steps (checkout/apply/commit) carry no auth env.
    for call in recorded[1:4]:
        assert call["env"] is None

    # The five expected git steps fired in order. Skip the global ``git``
    # options (``-C <dir>``, ``-c <key=val>``) to find each subcommand.
    def _git_subcommand(cmd: list[str]) -> str:
        i = 1  # cmd[0] == "git"
        while i < len(cmd) and cmd[i] in ("-C", "-c"):
            i += 2  # each takes one argument
        return cmd[i]

    steps = [_git_subcommand(c["cmd"]) for c in recorded]
    assert steps == ["clone", "checkout", "apply", "commit", "push"]


def test_app_branch_pusher_scrubs_token_from_errors() -> None:
    # The token rides in the http.extraHeader config value (passed via env, not
    # argv). If a failing git step's exception string ever surfaces that header,
    # it must NEVER leak the token — it is re-raised as a DispatcherError with the
    # token scrubbed to ***.
    def failing_run(cmd, *, cwd=None, env=None):
        # Simulate an error whose string carries the Authorization header value.
        raise RuntimeError(
            "fatal: remote rejected (Authorization: Bearer ghs_TESTTOKEN)"
        )

    push = app_branch_pusher(_StubTokenProvider(), _run=failing_run)
    with pytest.raises(DispatcherError) as excinfo:
        push(
            owner="owner",
            repo="repo",
            base="main",
            head_branch="agent-team/apply/abc",
            diff_text=DIFF,
        )
    assert "ghs_TESTTOKEN" not in str(excinfo.value)
    assert "***" in str(excinfo.value)
    # ``from None``: the token-bearing original is not chained onto the raised error.
    assert excinfo.value.__cause__ is None


# --------------------------------------------------------------------------- #
# app_workflow_dispatcher (App-token REST seam)
# --------------------------------------------------------------------------- #


class _FakeHttp:
    """Records POST/GET calls; returns a canned response object."""

    def __init__(self, *, post_status=204, get_body=None, get_status=200) -> None:
        self.post_calls: list[dict] = []
        self.get_calls: list[dict] = []
        self._post_status = post_status
        self._get_body = get_body or {}
        self._get_status = get_status

    def post(self, url, *, json=None, headers=None, timeout=None):
        self.post_calls.append({"url": url, "json": json, "headers": headers})
        return _FakeResp(status_code=self._post_status)

    def get(self, url, *, params=None, headers=None, timeout=None):
        self.get_calls.append({"url": url, "params": params, "headers": headers})
        return _FakeResp(status_code=self._get_status, body=self._get_body)


class _FakeResp:
    def __init__(self, *, status_code=200, body=None) -> None:
        self.status_code = status_code
        self._body = body or {}

    def json(self):
        return self._body


def test_app_workflow_dispatcher_posts_correct_url_and_body() -> None:
    http = _FakeHttp(post_status=204)
    fire = app_workflow_dispatcher(_StubTokenProvider(), _http=http)
    inputs = {"task_id": TASK, "diff_b64": "x"}
    fire(owner="owner", repo="repo", inputs=inputs, ref="main")

    call = http.post_calls[0]
    assert call["url"].endswith(
        "/actions/workflows/agent-team-apply-verify.yml/dispatches"
    )
    assert call["json"] == {"ref": "main", "inputs": inputs}
    # The installation token is carried as a Bearer header (and nowhere else).
    assert call["headers"]["Authorization"] == "Bearer ghs_TESTTOKEN"


def test_app_workflow_dispatcher_fails_closed_without_token_in_message() -> None:
    http = _FakeHttp(post_status=422)
    fire = app_workflow_dispatcher(_StubTokenProvider(), _http=http)
    with pytest.raises(DispatcherError) as excinfo:
        fire(owner="owner", repo="repo", inputs={"task_id": TASK}, ref="main")
    assert "422" in str(excinfo.value)
    assert "ghs_TESTTOKEN" not in str(excinfo.value)


class _RaisingHttp:
    """A transport whose post/get raises an exception that embeds the token."""

    def post(self, url, *, json=None, headers=None, timeout=None):
        raise RuntimeError(f"connection reset: {headers['Authorization']}")

    def get(self, url, *, params=None, headers=None, timeout=None):
        raise RuntimeError(f"connection reset: {headers['Authorization']}")


def test_app_workflow_dispatcher_scrubs_token_from_transport_error() -> None:
    # A transport exception must be re-raised as a DispatcherError carrying the
    # exception TYPE only — never the Bearer token, even if the underlying error
    # text embedded it.
    fire = app_workflow_dispatcher(_StubTokenProvider(), _http=_RaisingHttp())
    with pytest.raises(DispatcherError) as excinfo:
        fire(owner="owner", repo="repo", inputs={"task_id": TASK}, ref="main")
    assert "ghs_TESTTOKEN" not in str(excinfo.value)
    assert excinfo.value.__cause__ is None  # `from None` breaks the chain


# --------------------------------------------------------------------------- #
# app_run_locator (App-token REST seam; field mapping + run-name correlation)
# --------------------------------------------------------------------------- #


def test_app_run_locator_maps_rest_fields_and_correlates_run_name() -> None:
    # The REST list endpoint uses id/created_at; the locator must map them to the
    # databaseId/createdAt names select_run_id reads, and correlate on run-name.
    body = {
        "workflow_runs": [
            {
                "id": 12345,
                "name": run_name_for(TASK),
                "created_at": "2026-06-23T10:00:00Z",
                "status": "in_progress",
                "conclusion": None,
            }
        ]
    }
    http = _FakeHttp(get_body=body)
    locate = app_run_locator(_StubTokenProvider(), _http=http, _sleep=lambda *_a: None)
    run_id = locate(
        owner="owner",
        repo="repo",
        task_id=TASK,
        since_iso="2026-06-23T09:58:00Z",
    )
    assert run_id == "12345"
    # The list GET is authenticated + filtered to workflow_dispatch events.
    call = http.get_calls[0]
    assert call["url"].endswith("/actions/runs")
    assert call["params"]["event"] == "workflow_dispatch"
    assert call["headers"]["Authorization"] == "Bearer ghs_TESTTOKEN"


def test_app_run_locator_returns_none_for_non_matching_task() -> None:
    body = {
        "workflow_runs": [
            {
                "id": 999,
                "name": "agent-team-apply someone-else",
                "created_at": "2026-06-23T10:00:00Z",
                "status": "in_progress",
                "conclusion": None,
            }
        ]
    }
    http = _FakeHttp(get_body=body)
    locate = app_run_locator(_StubTokenProvider(), _http=http, _sleep=lambda *_a: None)
    assert (
        locate(
            owner="owner",
            repo="repo",
            task_id=TASK,
            since_iso="2026-06-23T09:58:00Z",
        )
        is None
    )


def test_app_run_locator_raises_on_auth_error_without_token_in_message() -> None:
    # A 401/403/404 list response must park immediately with the STATUS only
    # (never the token), not silently poll ~60s and return None as "no runs".
    http = _FakeHttp(get_status=403, get_body={"message": "Bad credentials"})
    locate = app_run_locator(_StubTokenProvider(), _http=http, _sleep=lambda *_a: None)
    with pytest.raises(DispatcherError) as excinfo:
        locate(
            owner="owner",
            repo="repo",
            task_id=TASK,
            since_iso="2026-06-23T09:58:00Z",
        )
    assert "403" in str(excinfo.value)
    assert "ghs_TESTTOKEN" not in str(excinfo.value)


def test_app_run_locator_scrubs_token_from_transport_error() -> None:
    locate = app_run_locator(
        _StubTokenProvider(), _http=_RaisingHttp(), _sleep=lambda *_a: None
    )
    with pytest.raises(DispatcherError) as excinfo:
        locate(
            owner="owner",
            repo="repo",
            task_id=TASK,
            since_iso="2026-06-23T09:58:00Z",
        )
    assert "ghs_TESTTOKEN" not in str(excinfo.value)
    assert excinfo.value.__cause__ is None