import { getStore } from 'app/store/nanostores/store';
import type { CanvasRasterLayerState, LoRA } from 'features/controlLayers/store/types';
import type {
  ControlNetConfigMetadata,
  IPAdapterConfigMetadata,
  MetadataValidateFunc,
  T2IAdapterConfigMetadata,
} from 'features/metadata/types';
import { InvalidModelConfigError } from 'features/metadata/util/modelFetchingHelpers';
import type { ParameterSDXLRefinerModel, ParameterVAEModel } from 'features/parameters/types/parameterSchemas';
import type { BaseModelType } from 'services/api/types';
import { assert } from 'tsafe';

/**
 * Checks the given base model type against the currently-selected model's base type and throws an error if they are
 * incompatible.
 * @param base The base model type to validate.
 * @param message An optional message to use in the error if the base model is incompatible.
 */
const validateBaseCompatibility = (base?: BaseModelType, message?: string) => {
  if (!base) {
    throw new InvalidModelConfigError(message || 'Missing base');
  }
  const currentBase = getStore().getState().params.model?.base;
  if (currentBase && base !== currentBase) {
    throw new InvalidModelConfigError(message || `Incompatible base models: ${base} and ${currentBase}`);
  }
};

const validateRefinerModel: MetadataValidateFunc<ParameterSDXLRefinerModel> = (refinerModel) => {
  validateBaseCompatibility('sdxl', 'Refiner incompatible with currently-selected model');
  return new Promise((resolve) => resolve(refinerModel));
};

const validateVAEModel: MetadataValidateFunc<ParameterVAEModel> = (vaeModel) => {
  validateBaseCompatibility(vaeModel.base, 'VAE incompatible with currently-selected model');
  return new Promise((resolve) => resolve(vaeModel));
};

const validateLoRA: MetadataValidateFunc<LoRA> = (lora) => {
  validateBaseCompatibility(lora.model.base, 'LoRA incompatible with currently-selected model');
  return new Promise((resolve) => resolve(lora));
};

const validateLoRAs: MetadataValidateFunc<LoRA[]> = (loras) => {
  const validatedLoRAs: LoRA[] = [];
  loras.forEach((lora) => {
    try {
      validateBaseCompatibility(lora.model.base, 'LoRA incompatible with currently-selected model');
      validatedLoRAs.push(lora);
    } catch {
      // This is a no-op - we want to continue validating the rest of the LoRAs, and an empty list is valid.
    }
  });
  return new Promise((resolve) => resolve(validatedLoRAs));
};

const validateControlNet: MetadataValidateFunc<ControlNetConfigMetadata> = (controlNet) => {
  validateBaseCompatibility(controlNet.model?.base, 'ControlNet incompatible with currently-selected model');
  return new Promise((resolve) => resolve(controlNet));
};

const validateControlNets: MetadataValidateFunc<ControlNetConfigMetadata[]> = (controlNets) => {
  const validatedControlNets: ControlNetConfigMetadata[] = [];
  controlNets.forEach((controlNet) => {
    try {
      validateBaseCompatibility(controlNet.model?.base, 'ControlNet incompatible with currently-selected model');
      validatedControlNets.push(controlNet);
    } catch {
      // This is a no-op - we want to continue validating the rest of the ControlNets, and an empty list is valid.
    }
  });
  return new Promise((resolve) => resolve(validatedControlNets));
};

const validateT2IAdapter: MetadataValidateFunc<T2IAdapterConfigMetadata> = (t2iAdapter) => {
  validateBaseCompatibility(t2iAdapter.model?.base, 'T2I Adapter incompatible with currently-selected model');
  return new Promise((resolve) => resolve(t2iAdapter));
};

const validateT2IAdapters: MetadataValidateFunc<T2IAdapterConfigMetadata[]> = (t2iAdapters) => {
  const validatedT2IAdapters: T2IAdapterConfigMetadata[] = [];
  t2iAdapters.forEach((t2iAdapter) => {
    try {
      validateBaseCompatibility(t2iAdapter.model?.base, 'T2I Adapter incompatible with currently-selected model');
      validatedT2IAdapters.push(t2iAdapter);
    } catch {
      // This is a no-op - we want to continue validating the rest of the T2I Adapters, and an empty list is valid.
    }
  });
  return new Promise((resolve) => resolve(validatedT2IAdapters));
};

const validateIPAdapter: MetadataValidateFunc<IPAdapterConfigMetadata> = (ipAdapter) => {
  validateBaseCompatibility(ipAdapter.model?.base, 'IP Adapter incompatible with currently-selected model');
  return new Promise((resolve) => resolve(ipAdapter));
};

const validateIPAdapters: MetadataValidateFunc<IPAdapterConfigMetadata[]> = (ipAdapters) => {
  const validatedIPAdapters: IPAdapterConfigMetadata[] = [];
  ipAdapters.forEach((ipAdapter) => {
    try {
      validateBaseCompatibility(ipAdapter.model?.base, 'IP Adapter incompatible with currently-selected model');
      validatedIPAdapters.push(ipAdapter);
    } catch {
      // This is a no-op - we want to continue validating the rest of the IP Adapters, and an empty list is valid.
    }
  });
  return new Promise((resolve) => resolve(validatedIPAdapters));
};

const validateLayer: MetadataValidateFunc<CanvasRasterLayerState> = async (layer) => {
  if (layer.type === 'control_adapter_layer') {
    const model = layer.controlAdapter.model;
    assert(model, 'Control Adapter layer missing model');
    validateBaseCompatibility(model.base, 'Layer incompatible with currently-selected model');
  }
  if (layer.type === 'ip_adapter_layer') {
    const model = layer.ipAdapter.model;
    assert(model, 'IP Adapter layer missing model');
    validateBaseCompatibility(model.base, 'Layer incompatible with currently-selected model');
  }
  if (layer.type === 'regional_guidance_layer') {
    for (const ipa of layer.ipAdapters) {
      const model = ipa.model;
      assert(model, 'IP Adapter layer missing model');
      validateBaseCompatibility(model.base, 'Layer incompatible with currently-selected model');
    }
  }

  return layer;
};

const validateLayers: MetadataValidateFunc<CanvasRasterLayerState[]> = async (layers) => {
  const validatedLayers: CanvasRasterLayerState[] = [];
  for (const l of layers) {
    try {
      const validated = await validateLayer(l);
      validatedLayers.push(validated);
    } catch {
      // This is a no-op - we want to continue validating the rest of the layers, and an empty list is valid.
    }
  }
  return new Promise((resolve) => resolve(validatedLayers));
};

export const validators = {
  refinerModel: validateRefinerModel,
  vaeModel: validateVAEModel,
  lora: validateLoRA,
  loras: validateLoRAs,
  controlNet: validateControlNet,
  controlNets: validateControlNets,
  t2iAdapter: validateT2IAdapter,
  t2iAdapters: validateT2IAdapters,
  ipAdapter: validateIPAdapter,
  ipAdapters: validateIPAdapters,
  layer: validateLayer,
  layers: validateLayers,
} as const;