from streamlit_helpers import *
from st_keyup import st_keyup
from sgm.modules.diffusionmodules.sampling import EulerAncestralSampler

VERSION2SPECS = {
    "SDXL-Turbo": {
        "H": 512,
        "W": 512,
        "C": 4,
        "f": 8,
        "is_legacy": False,
        "config": "configs/inference/sd_xl_base.yaml",
        "ckpt": "checkpoints/sd_xl_turbo_1.0.safetensors",
    },
    "SD-Turbo": {
        "H": 512,
        "W": 512,
        "C": 4,
        "f": 8,
        "is_legacy": False,
        "config": "configs/inference/sd_2_1.yaml",
        "ckpt": "checkpoints/sd_turbo.safetensors",
    },
}


class SubstepSampler(EulerAncestralSampler):
    def __init__(self, n_sample_steps=1, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.n_sample_steps = n_sample_steps
        self.steps_subset = [0, 100, 200, 300, 1000]

    def prepare_sampling_loop(self, x, cond, uc=None, num_steps=None):
        sigmas = self.discretization(
            self.num_steps if num_steps is None else num_steps, device=self.device
        )
        sigmas = sigmas[
            self.steps_subset[: self.n_sample_steps] + self.steps_subset[-1:]
        ]
        uc = cond
        x *= torch.sqrt(1.0 + sigmas[0] ** 2.0)
        num_sigmas = len(sigmas)
        s_in = x.new_ones([x.shape[0]])
        return x, s_in, sigmas, num_sigmas, cond, uc


def seeded_randn(shape, seed):
    randn = np.random.RandomState(seed).randn(*shape)
    randn = torch.from_numpy(randn).to(device="cuda", dtype=torch.float32)
    return randn


class SeededNoise:
    def __init__(self, seed):
        self.seed = seed

    def __call__(self, x):
        self.seed = self.seed + 1
        return seeded_randn(x.shape, self.seed)


def init_embedder_options(keys, init_dict, prompt=None, negative_prompt=None):
    value_dict = {}
    for key in keys:
        if key == "txt":
            value_dict["prompt"] = prompt
            value_dict["negative_prompt"] = ""

        if key == "original_size_as_tuple":
            orig_width = init_dict["orig_width"]
            orig_height = init_dict["orig_height"]

            value_dict["orig_width"] = orig_width
            value_dict["orig_height"] = orig_height

        if key == "crop_coords_top_left":
            crop_coord_top = 0
            crop_coord_left = 0

            value_dict["crop_coords_top"] = crop_coord_top
            value_dict["crop_coords_left"] = crop_coord_left

        if key == "aesthetic_score":
            value_dict["aesthetic_score"] = 6.0
            value_dict["negative_aesthetic_score"] = 2.5

        if key == "target_size_as_tuple":
            value_dict["target_width"] = init_dict["target_width"]
            value_dict["target_height"] = init_dict["target_height"]

    return value_dict


def sample(
    model,
    sampler,
    prompt="A lush garden with oversized flowers and vibrant colors, inhabited by miniature animals.",
    H=1024,
    W=1024,
    seed=0,
    filter=None,
):
    F = 8
    C = 4
    shape = (1, C, H // F, W // F)

    value_dict = init_embedder_options(
        keys=get_unique_embedder_keys_from_conditioner(model.conditioner),
        init_dict={
            "orig_width": W,
            "orig_height": H,
            "target_width": W,
            "target_height": H,
        },
        prompt=prompt,
    )

    if seed is None:
        seed = torch.seed()
    precision_scope = autocast
    with torch.no_grad():
        with precision_scope("cuda"):
            batch, batch_uc = get_batch(
                get_unique_embedder_keys_from_conditioner(model.conditioner),
                value_dict,
                [1],
            )
            c = model.conditioner(batch)
            uc = None
            randn = seeded_randn(shape, seed)

            def denoiser(input, sigma, c):
                return model.denoiser(
                    model.model,
                    input,
                    sigma,
                    c,
                )

            samples_z = sampler(denoiser, randn, cond=c, uc=uc)
            samples_x = model.decode_first_stage(samples_z)
            samples = torch.clamp((samples_x + 1.0) / 2.0, min=0.0, max=1.0)
            if filter is not None:
                samples = filter(samples)
            samples = (
                (255 * samples)
                .to(dtype=torch.uint8)
                .permute(0, 2, 3, 1)
                .detach()
                .cpu()
                .numpy()
            )
    return samples


def v_spacer(height) -> None:
    for _ in range(height):
        st.write("\n")


if __name__ == "__main__":
    st.title("Turbo")

    head_cols = st.columns([1, 1, 1])
    with head_cols[0]:
        version = st.selectbox("Model Version", list(VERSION2SPECS.keys()), 0)
        version_dict = VERSION2SPECS[version]

    with head_cols[1]:
        v_spacer(2)
        if st.checkbox("Load Model"):
            mode = "txt2img"
        else:
            mode = "skip"

    if mode != "skip":
        state = init_st(version_dict, load_filter=True)
        if state["msg"]:
            st.info(state["msg"])
        model = state["model"]
        load_model(model)

    # seed
    if "seed" not in st.session_state:
        st.session_state.seed = 0

    def increment_counter():
        st.session_state.seed += 1

    def decrement_counter():
        if st.session_state.seed > 0:
            st.session_state.seed -= 1

    with head_cols[2]:
        n_steps = st.number_input(label="number of steps", min_value=1, max_value=4)
    
    sampler = SubstepSampler(
        n_sample_steps=1,
        num_steps=1000,
        eta=1.0,
        discretization_config=dict(
            target="sgm.modules.diffusionmodules.discretizer.LegacyDDPMDiscretization"
        ),
    )
    sampler.n_sample_steps = n_steps
    default_prompt = "A cinematic shot of a baby racoon wearing an intricate italian priest robe."
    prompt = st_keyup("Enter a value", value=default_prompt, debounce=300, key="interactive_text")

    cols = st.columns([1, 5, 1])
    if mode != "skip":
        with cols[0]:
            v_spacer(14)
            st.button("↩", on_click=decrement_counter)
        with cols[2]:
            v_spacer(14)
            st.button("↪", on_click=increment_counter)

        sampler.noise_sampler = SeededNoise(seed=st.session_state.seed)
        out = sample(
            model, sampler, H=512, W=512, seed=st.session_state.seed, prompt=prompt, filter=state.get("filter")
        )
        with cols[1]:
            st.image(out[0])