from typing import Any


def build_lora_config(params: dict[str, Any]):
    """Build LoRA config dict from parameters."""
    return {
        "r": params.get("lora_r", 16),
        "lora_alpha": params.get("lora_alpha", 32),
        "lora_dropout": params.get("lora_dropout", 0.05),
        "target_modules": params.get("lora_target_modules", "all-linear"),
    }


def build_qlora_config(params: dict[str, Any]):
    """Build QLoRA config dict from parameters."""
    return {
        "bits": params.get("qlora_bits", 4),
        "qlora_type": params.get("qlora_type", "nf4"),
        "double_quant": params.get("qlora_double_quant", True),
        "lora": build_lora_config(params),
    }


def build_ia3_config(params: dict[str, Any]):
    return {"target_modules": params.get("ia3_target_modules", "all-linear")}


def build_adalora_config(params: dict[str, Any]):
    return {
        "init_r": params.get("adalora_init_r", 8),
        "target_r": params.get("adalora_target_r", 16),
        "beta1": params.get("adalora_beta1", 0.85),
        "beta2": params.get("adalora_beta2", 0.85),
    }


def build_prefix_tuning_config(params: dict[str, Any]):
    return {
        "num_virtual_tokens": params.get("prefix_num_virtual_tokens", 20),
        "encoder_hidden_size": params.get("prefix_encoder_hidden_size", 128),
    }