import {
  AnalysisCleanupLease,
  AnalysisCleanupLeaseGroup,
} from "../artifacts/AnalysisCleanupLease.js";
import {
  ArtifactResourceRetryFailure,
  ArtifactResourceScope,
} from "../artifacts/ArtifactResourceScope.js";
import { ArtifactReaderFailure } from "../artifacts/ArtifactReader.js";
import { AnalysisError } from "../domain/analysisErrorBase.js";
import { analysisErrorWithCleanupFailure } from "../domain/analysisErrorCleanup.js";
import { ProviderCleanupError } from "../domain/providerCleanupError.js";
import { DarwinProcessOwnershipInspectionError } from "../process/DarwinProcessRunTokenReader.js";
import { OwnedCommandFailure } from "../process/OwnedCommand.js";

interface CommandOwner {
  readonly lease: AnalysisCleanupLease;
  readonly cleanup: AnalysisError;
  readonly root: string | undefined;
}

/** Retain exact command/helper capabilities across invocation and shutdown. */
export class ApktoolCommandCleanup {
  readonly #scope = new ArtifactResourceScope();
  readonly #owners = new Set<CommandOwner>();

  async run<T>(operation: () => Promise<T>, name: string): Promise<T> {
    try {
      return await this.#scope.run(() => {
        this.#prune();
        return operation();
      });
    } catch (cause) {
      throw this.#retryFailure(cause, name);
    }
  }

  async close(): Promise<void> {
    try {
      await this.#scope.close();
    } catch (cause) {
      throw this.#retryFailure(cause, "close");
    } finally {
      this.#prune();
    }
  }

  pendingFor(root: string): boolean {
    this.#prune();
    return [...this.#owners].some((owner) => owner.root === root);
  }

  retainFailure(
    cause: unknown,
    primary: AnalysisError,
    operation: string,
    root?: string,
  ): AnalysisError {
    const retained: CommandOwner[] = [];
    const command = cause instanceof OwnedCommandFailure ? cause : undefined;
    const preparation =
      command?.preparationFailure ??
      (cause instanceof DarwinProcessOwnershipInspectionError
        ? cause
        : undefined);
    if (preparation?.cleanupFailure !== undefined) {
      const cleanup = preparation.cleanupFailure;
      retained.push(
        this.#retain(
          cleanup,
          async () => {
            if (!cleanup.cleanupIncomplete) return;
            if (preparation.cleanupOwner === undefined) throw cleanup;
            await preparation.cleanupOwner.close();
            if (cleanup.cleanupIncomplete) throw cleanup;
          },
          root,
        ),
      );
    }
    if (
      command !== undefined &&
      (command.cleanupOwner !== undefined || command.cleanupFailure !== null)
    ) {
      const owner = command.cleanupOwner;
      const cleanup = new ProviderCleanupError(
        "apktool",
        command.resources,
        {
          reason:
            command.cleanupFailure ?? "Command cleanup remains incomplete",
        },
        { operation, cause },
      );
      const retainedOwner = this.#retain(
        cleanup,
        async () => {
          if (owner === undefined) throw cleanup;
          const result = await owner.stop();
          if (result.status === "incomplete") throw new Error(result.reason);
        },
        root,
      );
      retainedOwner.lease.bindCleanupError(cleanup);
      retained.push(retainedOwner);
    }
    if (retained.length === 0) return primary;
    const cleanup = new ProviderCleanupError(
      "apktool",
      retained.flatMap((owner) => owner.cleanup.cleanupResources),
      {},
      { operation, cause },
    );
    this.#bind(cleanup, retained);
    return analysisErrorWithCleanupFailure(
      primary,
      cleanup,
      operation,
    ).bindCleanupDependencies([primary, cleanup]);
  }

  #retain(
    cleanup: AnalysisError,
    release: () => Promise<void>,
    root: string | undefined,
  ): CommandOwner {
    const lease = new AnalysisCleanupLease(async () => {
      try {
        await release();
      } catch (cause) {
        throw new ArtifactReaderFailure("unavailable", cleanup.message, {
          cause,
          cleanup: {
            reason: cleanup.message,
            resources: cleanup.cleanupResources,
          },
        });
      }
    }, cleanup.cleanupResources);
    const owner = { lease, cleanup, root };
    this.#owners.add(owner);
    this.#scope.retain({
      kind: "lease",
      resource: cleanup.cleanupResources[0] ?? "apktool command",
      lease,
    });
    return owner;
  }

  #bind(error: AnalysisError, owners: readonly CommandOwner[]): void {
    new AnalysisCleanupLeaseGroup(
      error,
      owners.map((owner) => owner.lease),
    );
    // Helper cleanup can itself contain independently released peers. Its
    // producer owns current labels; the leases own completion of this retry set.
    error.bindCleanupResourceOwner({
      get cleanupResources() {
        return [
          ...new Set(
            owners
              .filter((owner) => !owner.lease.released)
              .flatMap((owner) => owner.cleanup.cleanupResources),
          ),
        ];
      },
    });
  }

  #retryFailure(cause: unknown, operation: string): unknown {
    if (
      !(cause instanceof ArtifactResourceRetryFailure) ||
      cause.cleanup === undefined ||
      !cause.failedOwners.every(
        (failed) =>
          failed.kind === "lease" &&
          [...this.#owners].some((owner) => owner.lease === failed.lease),
      )
    )
      return cause;
    const owners = [...this.#owners].filter((owner) => !owner.lease.released);
    const failure = new ProviderCleanupError(
      "apktool",
      owners.flatMap((owner) => owner.cleanup.cleanupResources),
      { reason: cause.cleanup.reason },
      { operation, cause },
    );
    this.#bind(failure, owners);
    return failure;
  }

  #prune(): void {
    for (const owner of this.#owners)
      if (owner.lease.released) this.#owners.delete(owner);
  }
}