"""The prompt editor: what it saves, what it refuses to save, and the preview."""

from __future__ import annotations

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import select

from lembas.db.models import User
from lembas.services import harness, prompts, settings_store
from lembas.services.library import memories as memories_service


@pytest.fixture
def plain_user(client: TestClient, db, registered) -> User:
    """A second, non-admin account. Leaves the client signed in as them."""
    client.post("/auth/logout", follow_redirects=False)
    client.post(
        "/auth/register",
        data={"name": "Sam", "email": "sam@shire.test", "password": "potatoes-po-ta-toes"},
        follow_redirects=False,
    )
    return db.scalar(select(User).where(User.email == "sam@shire.test"))


def _owner(db) -> User:
    return db.scalar(select(User).where(User.email == "frodo@shire.test"))


# --- Access ------------------------------------------------------------------
def test_the_page_lists_every_fragment(client: TestClient, registered):
    page = client.get("/admin/prompts").text
    for fragment in prompts.BUILTIN:
        assert f'name="prompt.{fragment.key}"' in page, fragment.key


def test_the_preview_controls_are_inside_what_the_preview_includes(
    client: TestClient, registered
):
    """`hx-include="#prompt-form, #preview-controls"` is the whole wiring, so a
    control placed outside that container is submitted by nothing and changes
    nothing -- with no error, which is this codebase's recurring failure. Assert
    the containment rather than the markup of any one field.
    """
    page = client.get("/admin/prompts").text
    controls = page.split('id="preview-controls"', 1)[1].split("</div>\n  </div>", 1)[0]
    for name in ("preview_model", "preview_bases", "preview_documents",
                 "preview_situation", "preview_mode", "preview_family"):
        assert f'name="{name}"' in controls, name


def test_the_page_is_refused_to_a_plain_user(client: TestClient, plain_user):
    assert client.get("/admin/prompts").status_code == 403
    assert client.post("/admin/prompts", data={}).status_code == 403


# --- Saving ------------------------------------------------------------------
def test_saving_changes_what_a_model_is_told(client: TestClient, db, registered):
    client.post(
        "/admin/prompts",
        data={"prompt.tool.web_search": "- Always search twice.", "max_harness_chars": "0"},
        follow_redirects=False,
    )
    text = harness.compose(db, _owner(db), _tools("web_search"))
    assert "- Always search twice." in text
    assert "Look things up" not in text


def test_a_cleared_box_turns_the_fragment_off(client: TestClient, db, registered):
    """The trap this page was written around: FastAPI cannot tell an empty form
    field from an absent one, so the handler reads the raw form."""
    client.post(
        "/admin/prompts",
        data={"prompt.core.style": "", "max_harness_chars": "0"},
        follow_redirects=False,
    )
    assert prompts.stored(db) == {"core.style": ""}
    assert "Answer in the language" not in harness.compose(db, _owner(db), [])


def test_a_fragment_not_submitted_at_all_is_left_alone(client: TestClient, db, registered):
    prompts.save(db, {"core.heading": "## Rules"})
    client.post("/admin/prompts", data={"max_harness_chars": "0"}, follow_redirects=False)
    assert prompts.resolve(db, "core.heading") == "## Rules"


def test_saving_the_built_in_wording_stores_nothing(client: TestClient, db, registered):
    """Opening the page and pressing Save must not freeze today's defaults, or a
    later release could never improve them."""
    page_fields = {f"prompt.{f.key}": f.default for f in prompts.BUILTIN}
    client.post(
        "/admin/prompts", data={**page_fields, "max_harness_chars": "0"}, follow_redirects=False
    )
    assert prompts.stored(db) == {}


def test_the_character_cap_is_clamped_and_kept(client: TestClient, db, registered):
    client.post("/admin/prompts", data={"max_harness_chars": "-5"}, follow_redirects=False)
    assert settings_store.get(db, "max_harness_chars", key=settings_store.PROMPTS) == 0

    client.post("/admin/prompts", data={"max_harness_chars": "600"}, follow_redirects=False)
    assert harness.limit_for(db) == 600


# --- Resetting ---------------------------------------------------------------
def test_use_default_fills_the_box_without_saving(client: TestClient, db, registered):
    prompts.save(db, {"core.heading": "## Rules"})
    response = client.post("/admin/prompts/default", data={"key": "core.heading"})

    assert "## How to work" in response.text
    assert "edited" not in response.text
    # Nothing was written: it takes a Save to make it stick.
    assert prompts.resolve(db, "core.heading") == "## Rules"


def test_use_default_on_an_unknown_key_is_a_404(client: TestClient, registered):
    assert client.post("/admin/prompts/default", data={"key": "nope.nope"}).status_code == 404


def test_restore_all_defaults_empties_the_overrides(client: TestClient, db, registered):
    prompts.save(db, {"core.heading": "## Rules", "core.style": ""})
    client.post("/admin/prompts/reset", follow_redirects=False)
    assert prompts.stored(db) == {}


# --- Preview -----------------------------------------------------------------
def test_the_preview_shows_text_that_has_not_been_saved(client: TestClient, db, registered):
    body = client.post(
        "/admin/prompts/preview",
        data={"prompt.core.heading": "## Draft heading", "preview_family": ["web_search"]},
    ).text

    assert "## Draft heading" in body
    assert prompts.stored(db) == {}


def test_the_preview_only_shows_guidance_for_the_families_ticked(client: TestClient, registered):
    body = client.post("/admin/prompts/preview", data={"preview_family": ["notes"]}).text
    assert "You keep notes" in body
    assert "Look things up" not in body


def test_the_preview_escapes_what_a_model_wrote(client: TestClient, db, registered):
    """A memory is model-written text on an admin page. Hard rule 6 applies to
    the preview exactly as it does to a chat bubble."""
    memories_service.add(db, owner=_owner(db), content="<img src=x onerror=alert(1)>")
    body = client.post("/admin/prompts/preview", data={"preview_family": ["memory"]}).text

    assert "<img src=x" not in body
    assert "&lt;img src=x" in body


def test_the_preview_can_reach_the_fragments_that_need_a_chat(client: TestClient, registered):
    """Eleven fragments are gated on variables `context_variables` fills only
    when it is handed a real `Chat`, and the preview hands it `None`. So the
    entire agent surface, both scheduling fragments and the helper warning were
    absent from every preview whatever was ticked -- an administrator editing
    `tool.agent` previewed a system message with `tool.agent` missing from it,
    and nothing said so. The samples are what close that.
    """
    agent = client.post(
        "/admin/prompts/preview",
        data={"preview_family": ["agent"], "preview_mode": "plan"},
    ).text
    # tool.agent (agent_target), and the mode picked rather than a fixed one.
    assert "buildbox" in agent
    assert "Plan** mode" in agent
    # tool.project_files, context.agent_instructions, context.plan, tool.background
    assert "pyproject.toml" in agent
    assert "AGENTS.md" in agent
    assert "Fix the parser" in agent

    task = client.post(
        "/admin/prompts/preview", data={"preview_situation": "task", "preview_family": []}
    ).text
    assert "every weekday at 08:00" in task

    helper = client.post(
        "/admin/prompts/preview", data={"preview_situation": "helper", "preview_family": []}
    ).text
    assert "buildbox" not in helper
    assert helper != task


def test_the_preview_gates_its_samples_exactly_as_a_real_request_would(
    client: TestClient, registered
):
    """A preview that admitted a fragment the real request would not is worse
    than one that omitted it, so the samples follow the same gates: the agent
    block on the family, the other two on the situation and on no family at all.
    """
    plain = client.post("/admin/prompts/preview", data={"preview_family": ["notes"]}).text
    assert "buildbox" not in plain
    assert "AGENTS.md" not in plain
    assert "every weekday at 08:00" not in plain


def test_the_preview_warns_when_the_cap_would_cut_it_off(client: TestClient, db, registered):
    settings_store.update(db, {"max_harness_chars": 60}, key=settings_store.PROMPTS)
    body = client.post("/admin/prompts/preview", data={"preview_family": ["web_search"]}).text
    assert "past the cap is cut off" in body


def _tools(*names):
    from lembas.services import tools as tools_service

    return [tools_service.REGISTRY[name].schema for name in names]