import type { OpenClawConfig } from "../config/config.js";
import { resolveOwningPluginIdsForProvider } from "../plugins/providers.js";
import { normalizeOptionalLowercaseString } from "../shared/string-coerce.js";
import { normalizeProviderId } from "./provider-id.js";

type ModelTarget = {
  raw: string;
  provider?: string;
  modelId: string;
};

function normalizeCsvSet(values: Set<string> | null): Set<string> | null {
  if (!values) {
    return null;
  }
  const normalized = new Set<string>();
  for (const value of values) {
    const trimmed = value.trim();
    if (!trimmed) {
      continue;
    }
    normalized.add(trimmed);
  }
  return normalized.size > 0 ? normalized : null;
}

function parseModelTarget(raw: string): ModelTarget | null {
  const trimmed = raw.trim();
  if (!trimmed) {
    return null;
  }
  const slash = trimmed.indexOf("/");
  if (slash === -1) {
    return {
      raw: trimmed,
      modelId: trimmed.toLowerCase(),
    };
  }
  const provider = normalizeProviderId(trimmed.slice(0, slash));
  const modelId = trimmed
    .slice(slash + 1)
    .trim()
    .toLowerCase();
  if (!provider || !modelId) {
    return null;
  }
  return {
    raw: trimmed,
    provider,
    modelId,
  };
}

function hasSharedOwner(
  left: string,
  right: string,
  params: {
    config?: OpenClawConfig;
    workspaceDir?: string;
    env?: NodeJS.ProcessEnv;
    ownerCache: Map<string, readonly string[]>;
  },
): boolean {
  const resolveOwners = (provider: string): readonly string[] => {
    const normalized = normalizeProviderId(provider);
    const cached = params.ownerCache.get(normalized);
    if (cached) {
      return cached;
    }
    const owners =
      resolveOwningPluginIdsForProvider({
        provider: normalized,
        config: params.config,
        workspaceDir: params.workspaceDir,
        env: params.env,
      }) ?? [];
    params.ownerCache.set(normalized, owners);
    return owners;
  };

  const leftOwners = resolveOwners(left);
  const rightOwners = resolveOwners(right);
  return leftOwners.some((owner) => rightOwners.includes(owner));
}

export function createLiveTargetMatcher(params: {
  providerFilter: Set<string> | null;
  modelFilter: Set<string> | null;
  config?: OpenClawConfig;
  workspaceDir?: string;
  env?: NodeJS.ProcessEnv;
}) {
  const providerFilter = normalizeCsvSet(params.providerFilter);
  const modelTargets = [...(normalizeCsvSet(params.modelFilter) ?? [])]
    .map((value) => parseModelTarget(value))
    .filter((value): value is ModelTarget => value !== null);
  const ownerCache = new Map<string, readonly string[]>();

  return {
    matchesProvider(provider: string): boolean {
      if (!providerFilter) {
        return true;
      }
      const normalizedProvider = normalizeProviderId(provider);
      for (const requested of providerFilter) {
        const normalizedRequested = normalizeProviderId(requested);
        if (normalizedRequested === normalizedProvider) {
          return true;
        }
        if (
          hasSharedOwner(normalizedRequested, normalizedProvider, {
            config: params.config,
            workspaceDir: params.workspaceDir,
            env: params.env,
            ownerCache,
          })
        ) {
          return true;
        }
      }
      return false;
    },
    matchesModel(provider: string, modelId: string): boolean {
      if (modelTargets.length === 0) {
        return true;
      }
      const normalizedProvider = normalizeProviderId(provider);
      const normalizedModelId = normalizeOptionalLowercaseString(modelId);
      if (!normalizedModelId) {
        return false;
      }
      const directRef = `${normalizedProvider}/${normalizedModelId}`;
      for (const target of modelTargets) {
        if (normalizeOptionalLowercaseString(target.raw) === directRef) {
          return true;
        }
        if (target.modelId !== normalizedModelId) {
          continue;
        }
        if (!target.provider) {
          return true;
        }
        if (target.provider === normalizedProvider) {
          return true;
        }
        if (
          hasSharedOwner(target.provider, normalizedProvider, {
            config: params.config,
            workspaceDir: params.workspaceDir,
            env: params.env,
            ownerCache,
          })
        ) {
          return true;
        }
      }
      return false;
    },
  };
}
