import sqlite3

from src.following_store import FollowingStore


KEY = b"f" * 32
ITEM = {
    "repository": "stackchain/api",
    "number": 42,
    "title": "Make mobile review useful",
    "state": "open",
    "updated_at": "2026-08-23T03:00:00Z",
    "url": "https://forge.example/stackchain/api/issues/42",
}


def test_confirmed_watch_is_account_scoped_idempotent_and_encrypted(tmp_path):
    path = tmp_path / "following.sqlite3"
    store = FollowingStore(path, encryption_key=KEY, limit=50)

    first = store.set_watching("Timmy", ITEM, True)
    repeated = store.set_watching("timmy", ITEM, True)

    assert first == repeated == {
        "revision": 1,
        "items": [{**ITEM, "kind": "issue", "has_unseen_change": False}],
    }
    assert store.get("other") == {"revision": 0, "items": []}
    stored = sqlite3.connect(path).execute(
        "SELECT items FROM following_issues WHERE login = ?", ("timmy",)
    ).fetchone()[0]
    assert ITEM["title"] not in stored
    assert ITEM["repository"] not in stored


def test_refresh_marks_changed_items_unseen_and_sorts_them_first(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    quiet = {**ITEM, "number": 7, "title": "Quiet", "updated_at": "2026-08-23T02:00:00Z"}
    store.set_watching("timmy", quiet, True)
    store.set_watching("timmy", ITEM, True)

    snapshot = store.refresh("timmy", [{
        **quiet, "title": "Changed upstream", "state": "closed",
        "updated_at": "2026-08-23T04:00:00Z",
    }])

    assert [(item["number"], item["has_unseen_change"]) for item in snapshot["items"]] == [
        (7, True), (42, False)
    ]
    assert snapshot["items"][0]["title"] == "Changed upstream"
    assert snapshot["items"][0]["state"] == "closed"


def test_refresh_explains_change_from_last_reviewed_snapshot(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)

    closed = store.refresh("timmy", [{
        **ITEM,
        "title": "Make mobile review trustworthy",
        "state": "closed",
        "updated_at": "2026-08-23T04:00:00Z",
    }])

    assert closed["items"][0]["reviewed_at"] == ITEM["updated_at"]
    assert closed["items"][0]["change_summary"] == "Closed since last review"

    store.acknowledge(
        "timmy", ITEM["repository"], ITEM["number"], "2026-08-23T04:00:00Z"
    )
    title_change = store.refresh("timmy", [{
        **ITEM,
        "title": "Make mobile review understandable",
        "state": "closed",
        "updated_at": "2026-08-23T05:00:00Z",
    }])

    assert title_change["items"][0]["reviewed_at"] == "2026-08-23T04:00:00Z"
    assert title_change["items"][0]["change_summary"] == "Title changed since last review"


def test_acknowledgement_is_revision_conditional_and_later_change_is_unseen(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)
    changed = {**ITEM, "updated_at": "2026-08-23T04:00:00Z"}
    store.refresh("timmy", [changed])

    stale = store.acknowledge("timmy", ITEM["repository"], ITEM["number"], ITEM["updated_at"])
    assert stale["items"][0]["has_unseen_change"] is True
    seen = store.acknowledge("timmy", ITEM["repository"], ITEM["number"], changed["updated_at"])
    assert seen["items"][0]["has_unseen_change"] is False

    store.refresh("timmy", [{**ITEM, "updated_at": "2026-08-23T05:00:00Z"}])
    assert store.get("timmy")["items"][0]["has_unseen_change"] is True


def test_keep_for_later_restores_the_exact_seen_revision_as_unseen(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)
    changed = {**ITEM, "updated_at": "2026-08-23T04:00:00Z"}
    store.refresh("timmy", [changed])
    store.acknowledge("timmy", ITEM["repository"], ITEM["number"], changed["updated_at"])

    snapshot = store.keep_unseen(
        "timmy", ITEM["repository"], ITEM["number"], changed["updated_at"]
    )

    assert snapshot["items"][0]["has_unseen_change"] is True
    assert store.get("timmy")["items"][0]["has_unseen_change"] is True


def test_reopening_a_kept_revision_acknowledges_it_again(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)
    changed = {**ITEM, "updated_at": "2026-08-23T04:00:00Z"}
    store.refresh("timmy", [changed])
    store.acknowledge("timmy", ITEM["repository"], ITEM["number"], changed["updated_at"])
    store.keep_unseen("timmy", ITEM["repository"], ITEM["number"], changed["updated_at"])

    snapshot = store.acknowledge(
        "timmy", ITEM["repository"], ITEM["number"], changed["updated_at"]
    )

    assert snapshot["items"][0]["has_unseen_change"] is False


def test_reconfirmed_watch_does_not_mark_an_unseen_change_as_seen(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)
    changed = {**ITEM, "updated_at": "2026-08-23T04:00:00Z"}
    store.refresh("timmy", [changed])

    snapshot = store.set_watching("timmy", changed, True)

    assert snapshot["items"][0]["has_unseen_change"] is True


def test_following_preserves_kind_and_uses_it_in_item_identity(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    issue = {**ITEM, "kind": "issue"}
    pull = {
        **ITEM,
        "kind": "pull",
        "title": "Review the mobile flow",
        "url": "https://forge.example/stackchain/api/pulls/42",
    }

    store.set_watching("timmy", issue, True)
    snapshot = store.set_watching("timmy", pull, True)

    assert [(item["kind"], item["number"]) for item in snapshot["items"]] == [
        ("pull", 42),
        ("issue", 42),
    ]


def test_following_reads_legacy_items_as_issues(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    store.set_watching("timmy", ITEM, True)

    assert store.get("timmy")["items"][0]["kind"] == "issue"


def test_acknowledgement_only_marks_the_requested_item_kind_seen(tmp_path):
    store = FollowingStore(tmp_path / "following.sqlite3", encryption_key=KEY)
    for kind in ("issue", "pull"):
        store.set_watching("timmy", {**ITEM, "kind": kind}, True)
        store.refresh("timmy", [{**ITEM, "kind": kind, "updated_at": "2026-08-23T06:00:00Z"}])

    snapshot = store.acknowledge(
        "timmy", ITEM["repository"], ITEM["number"], "2026-08-23T06:00:00Z", kind="pull"
    )

    assert {item["kind"]: item["has_unseen_change"] for item in snapshot["items"]} == {
        "issue": True,
        "pull": False,
    }