"""Unit: the admin UI-settings API (phase 91, task 01; colors-only since
phase 190, task 02).

Covers ``app/api/ui_settings.py`` — the PUT validation + normalization
contract and the GET/PUT persistence on the single ``ui_settings`` row
(all 17 palette colors since phase 93, task 01 — the 9 identity +
the 8 semantic state):

* PUT validation — the 422s NAME the offending field (fixed details):
  a non-``#rrggbb`` color (wrong prefix, 3-digit shorthand, 8 hex
  chars, missing ``#``) — identity AND semantic fields alike (the loops
  are ``COLOR_FIELDS``-driven);
* the STRINGS are accepted and IGNORED (phase 190, A1 — the admin
  Settings panel is the single writable owner of ``app_name`` /
  ``input_placeholder`` / ``footer_text``): no body string is written,
  whatever its length or whitespace, and the stored columns are left
  exactly as they were (never cleared) — so an old cached client's Save
  cannot re-bake a name and shadow the panel;
* normalization — colors are lowercased on store; a color EQUAL to its
  built-in is stored as NULL (the owner-locked rule: "save the defaults"
  must leave the row empty — the no-op injection contract);
* GET — the effective merge (a partial row reports the DB values over
  the env/built-in defaults);
* upsert — the first PUT CREATES the id-1 row, the second UPDATES that
  same row (one row, always id 1).

House pattern (the ``test_tokens_api`` precedent): the real app via
TestClient (cookie jar = the house admin-login fixture) against the real
compose Postgres; the single row is global state, so an autouse fixture
resets it around every test.
"""
from __future__ import annotations

from collections.abc import Iterator

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import select, text
from sqlalchemy.orm import Session

from app.config import get_settings
from app.core import theming
from app.models import UiSettings

ALL_NULL_BODY: dict[str, str | None] = {
    "app_name": None, "input_placeholder": None, "footer_text": None,
    "bg": None, "surface": None, "ink": None, "ink_soft": None,
    "line": None, "grid_line": None, "brand": None, "brand_soft": None,
    "brand_ink": None,
    # The 8 semantic state colors (phase 93, task 01).
    "ok_bg": None, "ok_ink": None, "err_bg": None, "err_ink": None,
    "err_line": None, "accent_bg": None, "accent_ink": None,
    "accent_line": None,
}


@pytest.fixture(autouse=True)
def clean_ui_settings(db: Session) -> Iterator[None]:
    """ui_settings holds ONE row of global state: reset it around every
    test (the ``clean_tokens`` house pattern, DELETE — the row is
    created only by the PUT upsert, so "absent" is the natural
    pristine state)."""
    db.execute(text("DELETE FROM ui_settings"))
    db.commit()
    yield
    db.execute(text("DELETE FROM ui_settings"))
    db.commit()


def _row(db: Session) -> UiSettings | None:
    return db.execute(select(UiSettings).where(UiSettings.id == 1)).scalars().first()


def test_put_string_fields_are_ignored_not_validated(
    admin_client: TestClient, db: Session
) -> None:
    """Phase 190 (A1): the 3 string fields of the body are DROPPED before
    the handler reads them — no trim, no length check, no 422. A
    400-char name (the old 422 case) is a plain 200 that writes nothing,
    and the response reports the effective (env) value; the palette in
    the same body still saves. An old cached client can therefore never
    re-bake a brand string from this surface — and can never be blocked
    by a validation error on a field this API no longer owns."""
    for field in theming.STRING_FIELDS:
        r = admin_client.put(
            "/api/ui-settings", json={field: "x" * 301, "brand": "#818cf8"}
        )
        assert r.status_code == 200, (field, r.text)
        assert r.json()[field] == getattr(get_settings(), field)
        db.expire_all()
        row = _row(db)
        assert row is not None
        assert getattr(row, field) is None, f"{field} must never be stored"
        assert row.brand == "#818cf8"  # the colors half still saves beside it
    # And the row the PUT created holds no string at all.
    db.expire_all()
    row = _row(db)
    assert row is not None
    for field in theming.STRING_FIELDS:
        assert getattr(row, field) is None


def test_put_bad_hex_422_names_the_field(admin_client: TestClient) -> None:
    """Each of the 17 colors: anything not ``^#[0-9a-fA-F]{6}$`` is a
    422 naming that field — 3-digit shorthand, 8 hex digits, a bare hex
    without ``#``, a named color, and the empty string (the color clear
    operation is ``null``, not ``""``)."""
    for field in theming.COLOR_FIELDS:
        for bad in ("fff", "#ff", "ff00aa", "#12345678", "red"):
            r = admin_client.put("/api/ui-settings", json={field: bad})
            assert r.status_code == 422, (field, bad, r.text)
            assert r.json()["detail"] == f"{field} must be a #rrggbb hex color"
    # Phase 92 (task 01): the 9th identity color names its 422 the same
    # fixed way as the other 8 (the loop above already covers it via
    # COLOR_FIELDS; the explicit case pins the field name in the detail).
    r = admin_client.put("/api/ui-settings", json={"grid_line": "nope"})
    assert r.status_code == 422, r.text
    assert r.json()["detail"] == "grid_line must be a #rrggbb hex color"
    # Phase 93 (task 01): the semantic state fields name their 422 the
    # same fixed way (the loop covers all 8 via COLOR_FIELDS; the
    # explicit case pins a semantic field name in the detail).
    r = admin_client.put("/api/ui-settings", json={"err_line": "nope"})
    assert r.status_code == 422, r.text
    assert r.json()["detail"] == "err_line must be a #rrggbb hex color"
    r = admin_client.put("/api/ui-settings", json={"accent_ink": "#12345678"})
    assert r.status_code == 422, r.text
    assert r.json()["detail"] == "accent_ink must be a #rrggbb hex color"


def test_put_lowercases_colors_on_store(
    admin_client: TestClient, db: Session
) -> None:
    """Uppercase hex passes the validator and is stored LOWERCASE — the
    canonical form the tag renderer and the drift comparison rely on."""
    r = admin_client.put("/api/ui-settings", json={"brand": "#818CF8"})
    assert r.status_code == 200, r.text
    assert r.json()["brand"] == "#818cf8"
    row = _row(db)
    assert row is not None
    assert row.brand == "#818cf8"  # the stored column, not just the response


def test_put_built_in_color_is_stored_as_null(
    admin_client: TestClient, db: Session
) -> None:
    """The owner-locked normalization: a color equal to its built-in is
    stored as NULL — PUTting the whole built-in palette (with one value
    in uppercase, proving the compare happens AFTER the lowercase)
    leaves the row COMPLETELY empty: "save the defaults" must keep an
    unset deployment byte-identical (the no-op injection contract)."""
    body = dict(ALL_NULL_BODY)
    for key, value in theming.BUILTIN_COLORS.items():
        body[key] = value.upper() if key == "brand" else value
    r = admin_client.put("/api/ui-settings", json=body)
    assert r.status_code == 200, r.text
    # The response is the effective values — still the built-ins…
    for key in theming.COLOR_FIELDS:
        assert r.json()[key] == theming.BUILTIN_COLORS[key]
    # …and the row itself is empty (the upsert created a row of NULLs).
    row = _row(db)
    assert row is not None, "the PUT upsert creates the id-1 row"
    assert row.id == 1
    for field in (*theming.STRING_FIELDS, *theming.COLOR_FIELDS):
        assert getattr(row, field) is None, f"{field} must be stored as NULL"


def test_put_grid_line_built_in_is_stored_as_null(
    admin_client: TestClient, db: Session
) -> None:
    """Phase 92 (task 01): the 9th identity color gets the same
    owner-locked normalization as the other 8 — PUTting the built-in
    grid hex stores NULL (the response still reports the built-in, and
    the row's grid column stays empty); a NON-built-in value is stored
    as-is (lowercased)."""
    r = admin_client.put("/api/ui-settings", json={"grid_line": "#4a2626"})
    assert r.status_code == 200, r.text
    assert r.json()["grid_line"] == theming.BUILTIN_COLORS["grid_line"]
    row = _row(db)
    assert row is not None
    assert row.grid_line is None  # built-in → NULL

    r = admin_client.put("/api/ui-settings", json={"grid_line": "#123123"})
    assert r.status_code == 200, r.text
    assert r.json()["grid_line"] == "#123123"
    db.expire_all()  # drop the test session's pre-second-PUT view (house pattern)
    row = _row(db)
    assert row is not None
    assert row.grid_line == "#123123"  # non-built-in is stored as-is


def test_put_semantic_built_in_is_stored_as_null(
    admin_client: TestClient, db: Session
) -> None:
    """Phase 93 (task 01): the 8 semantic state colors get the same
    owner-locked normalization as the 9 identity colors — a value equal
    to its built-in stores NULL (the response still reports the
    built-in; the compare happens AFTER the lowercase — one value is
    PUT uppercase, proving it); a NON-built-in value is stored as-is
    (lowercased)."""
    r = admin_client.put("/api/ui-settings", json={"ok_ink": "#6EE7A8"})
    assert r.status_code == 200, r.text
    assert r.json()["ok_ink"] == theming.BUILTIN_COLORS["ok_ink"]
    row = _row(db)
    assert row is not None
    assert row.ok_ink is None  # built-in (uppercase in) → NULL

    r = admin_client.put("/api/ui-settings", json={"err_bg": "#2D0A0A"})
    assert r.status_code == 200, r.text
    db.expire_all()  # drop the test session's pre-second-PUT view (house pattern)
    row = _row(db)
    assert row is not None
    assert row.err_bg is None  # the second built-in (uppercase) → NULL too

    r = admin_client.put("/api/ui-settings", json={"accent_ink": "#CCCCCC"})
    assert r.status_code == 200, r.text
    assert r.json()["accent_ink"] == "#cccccc"
    db.expire_all()
    row = _row(db)
    assert row is not None
    assert row.accent_ink == "#cccccc"  # non-built-in stored as-is, lowercased
    # A semantic field NOT in the body clears back to NULL (full
    # replacement — the built-in returns via the resolver).
    assert row.ok_ink is None
    assert r.json()["ok_ink"] == theming.BUILTIN_COLORS["ok_ink"]


def test_put_cannot_clear_a_stored_string(
    admin_client: TestClient, db: Session
) -> None:
    """The A1 fallback survives the write strip: a legacy row that holds
    a baked-in string keeps it through an empty / whitespace / explicit
    ``null`` PUT — the Theme tab neither writes nor CLEARS the strings
    (clearing one is the panel's ``DELETE /api/admin/settings/{key}``).
    The response keeps reporting the effective value, so the old client
    still shows what the deployment shows."""
    db.add(UiSettings(id=1, app_name="Legacy bake", footer_text="Legacy footer"))
    db.commit()

    for body in ({"app_name": "   ", "footer_text": ""}, {"app_name": None}):
        r = admin_client.put("/api/ui-settings", json=body)
        assert r.status_code == 200, (body, r.text)
        db.expire_all()
        row = _row(db)
        assert row is not None
        assert row.app_name == "Legacy bake"  # never written, never cleared
        assert row.footer_text == "Legacy footer"
        # The response reports the EFFECTIVE value (the stored fallback).
        assert r.json()["app_name"] == "Legacy bake"
        assert r.json()["footer_text"] == "Legacy footer"


def test_get_effective_merge_partial_row(admin_client: TestClient, db: Session) -> None:
    """GET reports the DB values over the defaults, column by column: a
    row with ONLY ``bg`` set (hand-inserted) reports that color plus the
    built-ins and the env strings — all 20 keys, no nulls."""
    db.add(UiSettings(id=1, bg="#123456"))
    db.commit()
    r = admin_client.get("/api/ui-settings")
    assert r.status_code == 200
    body = r.json()
    assert set(body) == set(theming.STRING_FIELDS) | set(theming.COLOR_FIELDS)
    assert body["bg"] == "#123456"  # the DB value wins
    for key in theming.COLOR_FIELDS:
        if key != "bg":
            assert body[key] == theming.BUILTIN_COLORS[key]
    assert body["app_name"] == get_settings().app_name
    assert body["input_placeholder"] == get_settings().input_placeholder
    assert body["footer_text"] == get_settings().footer_text


def test_upsert_creates_then_updates_the_id_1_row(
    admin_client: TestClient, db: Session
) -> None:
    """The first PUT creates the id-1 row; the second updates the SAME
    row (still exactly one row, still id 1 — the single-row contract)."""
    r1 = admin_client.put(
        "/api/ui-settings", json={"brand": "#123abc", "app_name": "First"}
    )
    assert r1.status_code == 200, r1.text
    row = _row(db)
    assert row is not None and row.id == 1
    assert row.brand == "#123abc"
    assert row.app_name is None  # phase 190 A1: the body's string is dropped

    r2 = admin_client.put(
        "/api/ui-settings", json={"brand": "#abcdef", "input_placeholder": "Second"}
    )
    assert r2.status_code == 200, r2.text
    assert r2.json()["brand"] == "#abcdef"
    assert r2.json()["input_placeholder"] == get_settings().input_placeholder

    db.expire_all()  # drop the test session's pre-second-PUT view (house pattern)
    rows = db.execute(select(UiSettings)).scalars().all()
    assert len(rows) == 1, "the upsert must never create a second row"
    assert rows[0].id == 1
    assert rows[0].brand == "#abcdef"  # updated, not appended
    assert rows[0].input_placeholder is None  # the strings are never written
    assert rows[0].app_name is None