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_distill8() -> None:
    p = validate_and_clamp(
        prompt="a test prompt",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
    )
    assert p.width == 1024
    assert p.height == 1024
    assert p.steps == 8
    assert p.cfg == 1.0
    assert p.sampler_name == "euler_ancestral"
    assert p.scheduler == "beta"
    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=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        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=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_a",
        scheduler="beta",
        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=8,
            cfg=1.0,
            batch_size=1,
            sampler_name="euler_ancestral",
            scheduler="beta",
            denoise=1.0,
        )


def test_cfg_respects_step() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=1.23,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
    )
    assert abs(p.cfg - 1.2) < 0.01


def test_cfg_clamped_to_distill_max() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=2.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
    )
    assert p.cfg == 1.5
    assert any("cfg" in w.lower() for w in p.warnings)


def test_fixed_seed_is_used() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
        seed=12345,
        randomize_seed=False,
    )
    assert p.seed == 12345


def test_randomized_seed_is_in_range() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
        seed=12345,
        randomize_seed=True,
    )
    assert config.MIN_SEED <= p.seed <= config.MAX_SEED


def test_seed_clamps_when_locked() -> None:
    p = validate_and_clamp(
        prompt="x",
        negative_prompt="",
        width=1024,
        height=1024,
        steps=8,
        cfg=1.0,
        batch_size=1,
        sampler_name="euler_ancestral",
        scheduler="beta",
        denoise=1.0,
        seed=config.MAX_SEED + 1,
        randomize_seed=False,
    )
    assert p.seed == config.MAX_SEED
    assert any("seed" in w for w in p.warnings)