"""T98 (Phase 4): drawer phase-4 bundle.

Five sub-features extending the chat drawer:

* T98.1 — branching UI (create / switch / from-turn).
* T98.2 — significance-review panel (distribution + significance edits).
* T98.3 — hide-from-view toggle (per-turn, via ``manual_edit`` projector
  branch ``turn_hidden``).
* T98.4 — surgical delete with cascade preview (preview modal +
  rewind execution against a target turn).
* T98.5 — remaining v1 edits (chat narrative_anchor + weather).

Tests follow the T59 pattern in ``tests/test_drawer_events_threads_skip.py``
— a TestClient against the real FastAPI app with a per-test temp DB.
"""

from __future__ import annotations

from pathlib import Path

import pytest
from fastapi.testclient import TestClient

from chat.app import app
from chat.db.connection import open_db
from chat.eventlog.log import append_and_apply, append_event
from chat.eventlog.projector import project


@pytest.fixture
def client(tmp_path, monkeypatch):
    cfg = tmp_path / "config.toml"
    cfg.write_text('featherless_api_key = "test"\n')
    monkeypatch.setenv("CHAT_CONFIG_PATH", str(cfg))
    db = tmp_path / "test.db"
    monkeypatch.setenv("CHAT_DB_PATH", str(db))
    with TestClient(app) as c:
        if hasattr(app.state, "background_worker"):
            app.state.background_worker.enabled = False
        yield c


def _bot_payload(bot_id: str, name: str) -> dict:
    return {
        "id": bot_id,
        "name": name,
        "persona": "...",
        "voice_samples": [],
        "traits": [],
        "backstory": "",
        "initial_relationship_to_you": "",
        "kickoff_prose": "",
    }


def _seed_chat(db: Path, *, with_scene: bool = True) -> int:
    """Seed a chat hosted by ``bot_a``; return the latest event id (chat_created)."""
    with open_db(db) as conn:
        append_event(conn, kind="bot_authored", payload=_bot_payload("bot_a", "BotA"))
        append_event(
            conn,
            kind="you_authored",
            payload={"name": "Me", "pronouns": "they/them", "persona": ""},
        )
        chat_event_id = append_event(
            conn,
            kind="chat_created",
            payload={
                "id": "chat_bot_a",
                "host_bot_id": "bot_a",
                "initial_time": "2026-04-26T20:00:00+00:00",
                "narrative_anchor": "Day 1",
                "weather": "",
            },
        )
        if with_scene:
            append_event(
                conn,
                kind="scene_opened",
                payload={
                    "chat_id": "chat_bot_a",
                    "container_id": None,
                    "started_at": "2026-04-26T20:00:00+00:00",
                    "participants": ["you", "bot_a"],
                },
            )
        project(conn)
        return chat_event_id


# ---------------------------------------------------------------------------
# T98.1 — branching UI.
# ---------------------------------------------------------------------------


def test_t98_1_create_branch_emits_branch_created_and_renders(client, tmp_path):
    db = tmp_path / "test.db"
    seed_id = _seed_chat(db)

    response = client.post(
        "/chats/chat_bot_a/drawer/branch/create",
        data={"name": "experiment_a", "origin_event_id": str(seed_id)},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        rows = conn.execute(
            "SELECT COUNT(*) FROM event_log WHERE kind = 'branch_created'"
        ).fetchone()
        assert rows[0] == 1
        from chat.state.branches import get_branch

        b = get_branch(conn, "experiment_a")
        assert b is not None
        assert b["origin_event_id"] == seed_id
        assert b["chat_id"] == "chat_bot_a"

    # Drawer partial lists the new branch.
    body = response.text
    assert "<h3>Branches</h3>" in body
    assert "experiment_a" in body


def test_t98_1_switch_branch_marks_active_and_unknown_400s(client, tmp_path):
    db = tmp_path / "test.db"
    seed_id = _seed_chat(db)

    # Create branch directly via the service so this test focuses on switch.
    with open_db(db) as conn:
        from chat.services.branching import branch_from_event

        branch_from_event(
            conn, name="experiment_b", origin_event_id=seed_id, chat_id="chat_bot_a"
        )

    response = client.post(
        "/chats/chat_bot_a/drawer/branch/switch",
        data={"name": "experiment_b"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        from chat.state.branches import active_branch

        active = active_branch(conn)
        assert active is not None
        assert active["name"] == "experiment_b"

    # Unknown branch -> 400.
    bad = client.post(
        "/chats/chat_bot_a/drawer/branch/switch",
        data={"name": "ghost_branch"},
    )
    assert bad.status_code == 400


def test_t98_1_branch_from_turn_emits_branch_created(client, tmp_path):
    db = tmp_path / "test.db"
    seed_id = _seed_chat(db)

    # Append an extra turn so we can branch from it specifically.
    with open_db(db) as conn:
        turn_id = append_event(
            conn,
            kind="user_turn",
            payload={"chat_id": "chat_bot_a", "prose": "hi", "segments": []},
        )

    response = client.post(
        f"/chats/chat_bot_a/drawer/branch/from-turn/{turn_id}",
        data={"name": "fork_at_turn"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        from chat.state.branches import get_branch

        b = get_branch(conn, "fork_at_turn")
        assert b is not None
        assert b["origin_event_id"] == turn_id
        assert b["chat_id"] == "chat_bot_a"

    # Duplicate name -> 400 from service ValueError.
    dup = client.post(
        f"/chats/chat_bot_a/drawer/branch/from-turn/{turn_id}",
        data={"name": "fork_at_turn"},
    )
    assert dup.status_code == 400
    assert seed_id < turn_id  # sanity: turn is after chat_created


# ---------------------------------------------------------------------------
# T98.2 — significance review panel.
# ---------------------------------------------------------------------------


def _seed_memories_for_significance(db: Path) -> list[int]:
    """Seed three memories with significance levels 0, 1, 2. Returns ids.

    Uses ``append_and_apply`` (vs ``append_event`` + a final ``project``)
    so each row is applied exactly once — the chat row was already
    materialised by ``_seed_chat`` and a re-projection would conflict
    on ``chats.id`` UNIQUE.
    """
    ids: list[int] = []
    with open_db(db) as conn:
        for sig in (0, 1, 2):
            append_and_apply(
                conn,
                kind="memory_written",
                payload={
                    "owner_id": "bot_a",
                    "chat_id": "chat_bot_a",
                    "pov_summary": f"memory at significance {sig}",
                    "witness_you": 1,
                    "witness_host": 1,
                    "witness_guest": 0,
                    "significance": sig,
                },
            )
        rows = conn.execute(
            "SELECT id FROM memories WHERE chat_id = 'chat_bot_a' "
            "ORDER BY id ASC"
        ).fetchall()
        ids = [int(r[0]) for r in rows]
    return ids


def test_t98_2_distribution_renders_per_significance_bucket(client, tmp_path):
    db = tmp_path / "test.db"
    _seed_chat(db)
    _seed_memories_for_significance(db)

    response = client.get("/chats/chat_bot_a/drawer")
    assert response.status_code == 200
    body = response.text

    # Section heading + bar entries for each significance level.
    assert "<h3>Significance review</h3>" in body
    # All four buckets appear by their canonical label even when count=0.
    assert ">★★ (3)<" in body or "(3)" in body
    # The distribution markup names each level explicitly.
    for level in (0, 1, 2, 3):
        assert f"sig-bar sig-{level}" in body
    # Three seeded memories (sigs 0, 1, 2) — each has a count = 1 bar.
    # We don't pin exact text formatting, just verify the per-level bars
    # are present.


def test_t98_2_edit_significance_via_existing_route_lands_manual_edit(
    client, tmp_path
):
    db = tmp_path / "test.db"
    _seed_chat(db)
    ids = _seed_memories_for_significance(db)

    target_id = ids[0]  # initially significance=0
    response = client.post(
        f"/chats/chat_bot_a/drawer/memory/{target_id}/significance",
        data={"significance": "3"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        # Significance updated in the projected table.
        row = conn.execute(
            "SELECT significance FROM memories WHERE id = ?", (target_id,)
        ).fetchone()
        assert int(row[0]) == 3

        # manual_edit landed in the event log with the prior snapshot.
        import json as _json

        log_rows = conn.execute(
            "SELECT payload_json FROM event_log "
            "WHERE kind = 'manual_edit' ORDER BY id DESC LIMIT 1"
        ).fetchone()
        payload = _json.loads(log_rows[0])
        assert payload["target_kind"] == "memory_significance"
        assert int(payload["target_id"]) == target_id
        assert payload["prior_value"] == 0
        assert payload["new_value"] == 3


# ---------------------------------------------------------------------------
# T98.3 — hide-from-view toggle.
# ---------------------------------------------------------------------------


def _seed_turns(db: Path) -> tuple[int, int]:
    """Append one user_turn + one assistant_turn; return their event ids."""
    with open_db(db) as conn:
        user_id = append_and_apply(
            conn,
            kind="user_turn",
            payload={
                "chat_id": "chat_bot_a",
                "prose": "How are you doing today?",
                "segments": [],
            },
        )
        bot_id = append_and_apply(
            conn,
            kind="assistant_turn",
            payload={
                "chat_id": "chat_bot_a",
                "speaker_id": "bot_a",
                "text": "Quite well, thanks for asking!",
                "truncated": False,
                "user_turn_id": user_id,
            },
        )
    return user_id, bot_id


def test_t98_3_hide_turn_flips_event_log_hidden_via_manual_edit(
    client, tmp_path
):
    db = tmp_path / "test.db"
    _seed_chat(db)
    user_id, bot_id = _seed_turns(db)

    response = client.post(
        f"/chats/chat_bot_a/drawer/turn/hide/{user_id}",
        data={"hidden": "1"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        # event_log.hidden flipped to 1.
        row = conn.execute(
            "SELECT hidden FROM event_log WHERE id = ?", (user_id,)
        ).fetchone()
        assert int(row[0]) == 1

        # manual_edit landed with the prior snapshot.
        import json as _json

        log = conn.execute(
            "SELECT payload_json FROM event_log "
            "WHERE kind = 'manual_edit' ORDER BY id DESC LIMIT 1"
        ).fetchone()
        payload = _json.loads(log[0])
        assert payload["target_kind"] == "turn_hidden"
        assert int(payload["target_id"]) == user_id
        assert payload["prior_value"] == {"hidden": 0}
        assert payload["new_value"] == {"hidden": 1}


def test_t98_3_hidden_turn_disappears_from_read_recent_dialogue(
    client, tmp_path
):
    """Hiding a turn must drop it from the prompt-window read.

    ``read_recent_dialogue`` (chat.services.turn_common) filters
    ``hidden = 0`` server-side, so flipping the flag via the drawer
    route must surface immediately.
    """
    db = tmp_path / "test.db"
    _seed_chat(db)
    user_id, bot_id = _seed_turns(db)

    # Sanity baseline — both turns visible before the hide.
    with open_db(db) as conn:
        from chat.services.turn_common import read_recent_dialogue

        before = read_recent_dialogue(conn, "chat_bot_a", limit=10)
        before_ids = [t["event_id"] for t in before]
        assert user_id in before_ids
        assert bot_id in before_ids

    # Hide the user turn via the drawer route.
    response = client.post(
        f"/chats/chat_bot_a/drawer/turn/hide/{user_id}",
        data={"hidden": "1"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        from chat.services.turn_common import read_recent_dialogue

        after = read_recent_dialogue(conn, "chat_bot_a", limit=10)
        after_ids = [t["event_id"] for t in after]
        assert user_id not in after_ids
        assert bot_id in after_ids  # the unhidden bot turn still surfaces


# ---------------------------------------------------------------------------
# T98.4 — surgical delete with cascade preview.
# ---------------------------------------------------------------------------


def test_t98_4_delete_preview_returns_impact_report_html(client, tmp_path):
    db = tmp_path / "test.db"
    _seed_chat(db)
    user_id, bot_id = _seed_turns(db)

    response = client.get(
        f"/chats/chat_bot_a/drawer/turn/delete-preview/{user_id}"
    )
    assert response.status_code == 200
    body = response.text

    # Modal markup with the event id and the cascade list.
    assert "delete-impact-modal" in body
    assert f"Delete event {user_id}?" in body
    assert "delete-impact-cascade" in body
    # Both turns ride along in the cascade — user_turn at user_id, then
    # the assistant_turn at bot_id (>= user_id).
    assert "user_turn" in body
    assert "assistant_turn" in body
    # Confirm-form posts to the delete route.
    assert f"/drawer/turn/delete/{user_id}" in body


def test_t98_4_delete_invokes_rewind_and_drops_cascade(client, tmp_path):
    db = tmp_path / "test.db"
    _seed_chat(db)
    user_id, bot_id = _seed_turns(db)

    # Append a third turn after the assistant_turn so we can verify the
    # cascade catches everything from user_id forward.
    with open_db(db) as conn:
        extra_id = append_and_apply(
            conn,
            kind="user_turn",
            payload={
                "chat_id": "chat_bot_a",
                "prose": "follow-up",
                "segments": [],
            },
        )

    # Sanity: all three turn rows exist.
    with open_db(db) as conn:
        turn_count = conn.execute(
            "SELECT COUNT(*) FROM event_log "
            "WHERE kind IN ('user_turn', 'assistant_turn')"
        ).fetchone()[0]
        assert turn_count == 3

    # Delete from user_id forward.
    response = client.post(f"/chats/chat_bot_a/drawer/turn/delete/{user_id}")
    assert response.status_code == 200

    # All three turns are gone — the rewind truncated the log past
    # user_id - 1, removing user_id, bot_id, and extra_id.
    with open_db(db) as conn:
        turn_count = conn.execute(
            "SELECT COUNT(*) FROM event_log "
            "WHERE kind IN ('user_turn', 'assistant_turn')"
        ).fetchone()[0]
        assert turn_count == 0
        for ev_id in (user_id, bot_id, extra_id):
            row = conn.execute(
                "SELECT 1 FROM event_log WHERE id = ?", (ev_id,)
            ).fetchone()
            assert row is None, f"event {ev_id} should have been deleted"


# ---------------------------------------------------------------------------
# T98.5 — remaining v1 edits (chat narrative anchor + weather).
# ---------------------------------------------------------------------------


def test_t98_5_edit_chat_narrative_anchor_emits_manual_edit(client, tmp_path):
    db = tmp_path / "test.db"
    _seed_chat(db)

    response = client.post(
        "/chats/chat_bot_a/drawer/chat/narrative-anchor",
        data={"new_value": "Late evening, after dinner"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        row = conn.execute(
            "SELECT narrative_anchor FROM chat_state WHERE chat_id = ?",
            ("chat_bot_a",),
        ).fetchone()
        assert row[0] == "Late evening, after dinner"

        import json as _json

        log = conn.execute(
            "SELECT payload_json FROM event_log "
            "WHERE kind = 'manual_edit' ORDER BY id DESC LIMIT 1"
        ).fetchone()
        payload = _json.loads(log[0])
        assert payload["target_kind"] == "chat_narrative_anchor"
        assert payload["target_id"] == "chat_bot_a"
        assert payload["prior_value"] == "Day 1"
        assert payload["new_value"] == "Late evening, after dinner"


def test_t98_5_edit_chat_weather_emits_manual_edit(client, tmp_path):
    db = tmp_path / "test.db"
    _seed_chat(db)

    response = client.post(
        "/chats/chat_bot_a/drawer/chat/weather",
        data={"new_value": "thunderstorm rolling in"},
    )
    assert response.status_code == 200

    with open_db(db) as conn:
        row = conn.execute(
            "SELECT weather FROM chat_state WHERE chat_id = ?",
            ("chat_bot_a",),
        ).fetchone()
        assert row[0] == "thunderstorm rolling in"

        import json as _json

        log = conn.execute(
            "SELECT payload_json FROM event_log "
            "WHERE kind = 'manual_edit' ORDER BY id DESC LIMIT 1"
        ).fetchone()
        payload = _json.loads(log[0])
        assert payload["target_kind"] == "chat_weather"
        assert payload["target_id"] == "chat_bot_a"
        assert payload["prior_value"] == ""
        assert payload["new_value"] == "thunderstorm rolling in"