import os


def env_entry(name, value, comment, null=False):
    return f"# {comment}\n{'# ' if null else ''}{name}={value}\n"


def generate_env(
    *,
    env_suno_use_small_models: bool = False,
    env_suno_enable_mps: bool = False,
    env_suno_offload_cpu: bool = False,
    model_location_hf_env_var: str = "",
    model_location_hf_env_var2: str = "",
    model_location_th_home: str = "",
    model_location_th_xdg: str = "",
    # data\models\rvc\checkpoints\Alina_Gray-20230627T032329Z-001\Alina_Gray.pth
    rvc_weight_root: str = "data/models/rvc/checkpoints",
    rvc_weight_uvr5_root: str = "data/models/rvc/uvr5_weights",
    rvc_index_root: str = "data/models/rvc/checkpoints",
    rvc_outside_index_root: str = "data/models/rvc/checkpoints",
    rvc_rmvpe_root: str = "data/models/rvc/rmvpe",
):
    def get_suno_env(name):
        return os.environ.get(name, "").lower() in ("true", "1")

    if not env_suno_use_small_models:
        env_suno_use_small_models = get_suno_env("SUNO_USE_SMALL_MODELS")
    if not env_suno_enable_mps:
        env_suno_enable_mps = get_suno_env("SUNO_ENABLE_MPS")
    if not env_suno_offload_cpu:
        env_suno_offload_cpu = get_suno_env("SUNO_OFFLOAD_CPU")

    if not model_location_hf_env_var:
        model_location_hf_env_var = os.environ.get("HUGGINGFACE_HUB_CACHE", "")
    if not model_location_hf_env_var2:
        model_location_hf_env_var2 = os.environ.get("HF_HOME", "")
    if not model_location_th_home:
        model_location_th_home = os.environ.get("TORCH_HOME", "")
    if not model_location_th_xdg:
        model_location_th_xdg = os.environ.get("XDG_CACHE_HOME", "")

    if not rvc_weight_root:
        rvc_weight_root = os.environ.get("weight_root", "")
    if not rvc_weight_uvr5_root:
        rvc_weight_uvr5_root = os.environ.get("weight_uvr5_root", "")
    if not rvc_index_root:
        rvc_index_root = os.environ.get("index_root", "")
    if not rvc_outside_index_root:
        rvc_outside_index_root = os.environ.get("outside_index_root", "")
    if not rvc_rmvpe_root:
        rvc_rmvpe_root = os.environ.get("rmvpe_root", "")

    env = "# This file gets updated automatically from the UI\n\n"
    env += "# If you wish to manually specify any ENV variables, please do so in the .env.user file\n"
    env += "# The variables in .env.user will take PRIORITY!\n\n"

    env += env_entry(
        "SUNO_USE_SMALL_MODELS",
        env_suno_use_small_models,
        "Duplicates small models checkboxes",
    )
    env += env_entry(
        "SUNO_ENABLE_MPS",
        env_suno_enable_mps,
        "Use MPS when CUDA is unavailable",
    )
    env += env_entry(
        "SUNO_OFFLOAD_CPU", env_suno_offload_cpu, "Offload GPU models to CPU"
    )

    env += "\n"

    env += env_entry(
        "HUGGINGFACE_HUB_CACHE",
        model_location_hf_env_var,
        "Environment variable for HuggingFace model location",
        null=not model_location_hf_env_var,
    )

    env += env_entry(
        "HF_HOME",
        model_location_hf_env_var2,
        "Environment variable for HuggingFace model location (alternative)",
        null=not model_location_hf_env_var2,
    )

    env += env_entry(
        "TORCH_HOME",
        model_location_th_home,
        "Default location for Torch Hub models",
        null=not model_location_th_home,
    )

    env += env_entry(
        "XDG_CACHE_HOME",
        model_location_th_xdg,
        "Default location for Torch Hub models (alternative)",
        null=not model_location_th_xdg,
    )

    env += "\n"

    env += env_entry(
        "weight_root",
        rvc_weight_root,
        "Root directory for RVC model weights",
        null=not rvc_weight_root,
    )

    env += env_entry(
        "weight_uvr5_root",
        rvc_weight_uvr5_root,
        "Root directory for RVC model weights (UVR5)",
        null=not rvc_weight_uvr5_root,
    )

    env += env_entry(
        "index_root",
        rvc_index_root,
        "Root directory for RVC model indices",
        null=not rvc_index_root,
    )

    env += env_entry(
        "outside_index_root",
        rvc_outside_index_root,
        "Root directory for RVC model indices (outside)",
        null=not rvc_outside_index_root,
    )

    env += env_entry(
        "rmvpe_root",
        rvc_rmvpe_root,
        "Root directory for RVC model RMVPE",
        null=not rvc_rmvpe_root,
    )

    env += "\n"

    return env


def write_env(text: str):
    with open(".env", "w") as outfile:
        outfile.write(text)


def setup_or_recover():
    if not os.path.exists("outputs"):
        os.makedirs("outputs")
    if not os.path.exists("favorites"):
        os.makedirs("favorites")
    if not os.path.exists(".env"):
        print("Env file not found. Creating default env.")
        write_env(generate_env())