from __future__ import annotations

import pytest

from src import config
from src.errors import UserFacingError
from src.validation import validate_and_clamp


def test_defaults_match_rdbt() -> None:
    p = validate_and_clamp(
        prompt="a test prompt",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=16,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="simple",
        denoise=1.0,
    )
    assert p.width == 1024
    assert p.height == 1024
    assert p.steps == 16
    assert p.cfg == 1.0
    assert p.sampler_name == "euler_ancestral"
    assert p.scheduler == "simple"
    assert p.denoise == 1.0
    assert p.negative_prompt == ""


def test_clamp_width_height() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=100,
        height=3000,
        steps=16,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="simple",
        denoise=1.0,
    )
    assert p.width == 512
    assert p.height == 2048
    assert p.warnings


def test_euler_a_alias() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=16,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_a",
        scheduler="simple",
        denoise=1.0,
    )
    assert p.sampler_name == "euler_ancestral"
    assert any("euler" in w.lower() for w in p.warnings)


def test_empty_prompt_rejected() -> None:
    with pytest.raises(UserFacingError):
        validate_and_clamp(
            prompt="  ",
            negative_prompt="",
            width=1024,
            height=1024,
            steps=16,
            cfg=1.0,
            batch_size=1,
            sampler_name="euler_ancestral",
            scheduler="simple",
            denoise=1.0,
        )


def test_cfg_respects_step() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=16,
        cfg=1.23,  # will snap
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="simple",
        denoise=1.0,
    )
    # snapped to 0.1 step from min 1.0: round((1.23-1)/0.1)*0.1+1 = 1.2
    assert abs(p.cfg - 1.2) < 0.01