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198// ACP client terminals: scoped broker children with interleaved output.
// Buffers keep the newest UTF-8 bytes; releasing a terminal rejects its waits.
import * as Effect from "effect/Effect";
import * as Deferred from "effect/Deferred";
import * as Data from "effect/Data";
import * as Exit from "effect/Exit";
import * as Scope from "effect/Scope";
import * as Stream from "effect/Stream";
import * as z from "zod";
import { Process } from "convergence/effect";
import type { ChildProcess } from "convergence";
import { newId } from "../sdk/agent.ts";
import { errorMessage } from "../sdk/errors.ts";
import type { ProcessExit } from "../sdk/process.ts";
export const DEFAULT_OUTPUT_LIMIT = 1024 * 1024;
const encoder = new TextEncoder();
export class TerminalFailed extends Data.TaggedError("TerminalFailed")<{ readonly message: string }> {}
const failed = (cause: unknown) => new TerminalFailed({ message: errorMessage(cause) });
export class OutputBuffer {
  limit: number;
  text = "";
  truncated = false;
  constructor(limit?: unknown) {
    this.limit = typeof limit === "number" && Number.isInteger(limit) && limit >= 0 ? limit : DEFAULT_OUTPUT_LIMIT;
  }
  push(more: string) {
    this.text += more;
    if (this.text.length * 3 <= this.limit) return;
    const bytes = encoder.encode(this.text);
    if (bytes.length <= this.limit) return;
    let start = bytes.length - this.limit;
    while (start < bytes.length && ((bytes[start] ?? 0) & 0xc0) === 0x80) start += 1;
    this.text = new TextDecoder().decode(bytes.subarray(start));
    this.truncated = true;
  }
}
export function shellLine(command: string, args?: readonly string[]) {
  return [command, ...(args ?? [])].join(" ");
}
export const terminalRequest = z.object({
  sessionId: z.unknown().optional(),
  command: z.unknown().optional(),
  args: z.array(z.unknown()).catch([]),
  cwd: z.unknown().optional(),
  env: z.array(z.unknown()).catch([]),
  outputByteLimit: z.unknown().optional(),
});
export interface TerminalRequest {
  sessionId?: unknown;
  command?: unknown;
  args?: unknown;
  cwd?: unknown;
  env?: unknown;
  outputByteLimit?: unknown;
}
interface Terminal {
  session: string;
  command: string;
  cwd: string | null;
  output: OutputBuffer;
  child: ChildProcess;
  exit: ProcessExit | null;
  released: boolean;
  exited: Deferred.Deferred<ProcessExit, TerminalFailed>;
  scope: Scope.Closeable;
}
export class Terminals {
  terminals = new Map<string, Terminal>();
  scope: Scope.Scope;
  constructor(scope: Scope.Scope) {
    this.scope = scope;
  }
  create = Effect.fn("Terminals.create")(function* (this: Terminals, input: TerminalRequest) {
    const request = terminalRequest.parse(input);
    const command = String(request.command ?? "");
    if (!command) return yield* new TerminalFailed({ message: "terminal/create needs a command" });
    const args = request.args.map(String);
    const env: Record<string, string> = {};
    for (const raw of request.env) {
      const variable = z.record(z.string(), z.unknown()).safeParse(raw).data ?? {};
      if (typeof variable.name === "string") env[variable.name] = String(variable.value ?? "");
    }
    const cwd = typeof request.cwd === "string" && request.cwd ? request.cwd : undefined;
    const process = yield* Process;
    const scope = yield* Scope.fork(this.scope, "sequential");
    const child = yield* process.spawn(command, args, { cwd, env }).pipe(
      Scope.provide(scope),
      Effect.catchTag(["HostCallFailed", "PermissionNotGranted", "NeedsReview"], (error) =>
        Effect.fail(new TerminalFailed({ message: `could not run ${command}: ${error.message}` })),
      ),
    );
    // Commands receive no input; closed input is harmless.
    yield* Effect.tryPromise({ try: () => child.stdin.close(), catch: failed }).pipe(
      Effect.catchTag("TerminalFailed", () => Effect.void),
      Effect.forkIn(scope, { startImmediately: true }),
    );
    const terminal: Terminal = {
      session: String(request.sessionId ?? ""),
      command: shellLine(command, args),
      cwd: cwd ?? null,
      output: new OutputBuffer(request.outputByteLimit),
      child,
      exit: null,
      released: false,
      exited: yield* Deferred.make<ProcessExit, TerminalFailed>(),
      scope,
    };
    const read = Effect.fn("Terminals.read")(function* (stream: ChildProcess["stdout"]) {
      const decoder = new TextDecoder();
      // A broken pipe only ends the output.
      yield* Stream.runForEach(Stream.fromAsyncIterable(stream, failed), (chunk) =>
        Effect.sync(() => {
          terminal.output.push(typeof chunk === "string" ? chunk : decoder.decode(chunk, { stream: true }));
        }),
      ).pipe(
        Effect.tap(() =>
          Effect.sync(() => {
            const rest = decoder.decode();
            if (rest) terminal.output.push(rest);
          }),
        ),
        Effect.catchTag("TerminalFailed", () => Effect.void),
      );
    });
    yield* Effect.all(
      [Effect.tryPromise({ try: () => child.exited, catch: failed }), read(child.stdout), read(child.stderr)],
      { concurrency: "unbounded" },
    ).pipe(
      Effect.flatMap(([status]) =>
        Effect.sync(() => {
          terminal.exit = { code: status.code ?? null, signal: status.signal ?? null };
          return terminal.exit;
        }),
      ),
      Effect.flatMap((status) => Deferred.succeed(terminal.exited, status)),
      Effect.catchTag("TerminalFailed", (error) => Deferred.fail(terminal.exited, error)),
      Effect.forkIn(scope),
    );
    const id = newId("acp-terminal");
    this.terminals.set(id, terminal);
    return id;
  });
  get(id: string) {
    const terminal = this.terminals.get(id);
    if (!terminal) throw new TerminalFailed({ message: `unknown terminal ${id}` });
    return terminal;
  }
  output(id: string) {
    const terminal = this.get(id);
    return { output: terminal.output.text, truncated: terminal.output.truncated, exit: terminal.exit };
  }
  wait = Effect.fn("Terminals.wait")(function* (this: Terminals, id: string) {
    const terminal = yield* Effect.try({ try: () => this.get(id), catch: failed });
    return terminal.exit ?? (yield* Deferred.await(terminal.exited));
  });
  kill = Effect.fn("Terminals.kill")(function* (this: Terminals, id: string) {
    const terminal = yield* Effect.try({ try: () => this.get(id), catch: failed });
    if (terminal.exit === null)
      yield* Effect.tryPromise({ try: () => terminal.child.kill("SIGKILL"), catch: failed }).pipe(
        Effect.catchTag("TerminalFailed", () => Effect.void),
      );
  });
  release = Effect.fn("Terminals.release")(function* (this: Terminals, id: string) {
    const terminal = this.terminals.get(id);
    if (!terminal) return;
    this.terminals.delete(id);
    terminal.released = true;
    if (terminal.exit === null) {
      yield* Deferred.fail(
        terminal.exited,
        new TerminalFailed({ message: `terminal ${id} was released before it exited` }),
      );
      yield* Effect.tryPromise({ try: () => terminal.child.kill("SIGKILL"), catch: failed }).pipe(
        Effect.catchTag("TerminalFailed", () => Effect.void),
      );
    }
    yield* Scope.close(terminal.scope, Exit.void);
  });
  releaseSession = Effect.fn("Terminals.releaseSession")(function* (this: Terminals, session: string) {
    for (const [id, terminal] of [...this.terminals]) if (terminal.session === session) yield* this.release(id);
  });
  releaseAll = Effect.fn("Terminals.releaseAll")(function* (this: Terminals) {
    for (const id of [...this.terminals.keys()]) yield* this.release(id);
  });
  views(session: string) {
    const views = new Map<string, { command: string; cwd: string | null; output: string; exitCode: number | null }>();
    for (const [id, terminal] of this.terminals) {
      if (terminal.session !== session) continue;
      views.set(id, {
        command: terminal.command,
        cwd: terminal.cwd,
        output: terminal.output.text,
        exitCode: terminal.exit?.code ?? null,
      });
    }
    return views;
  }
}