import path from "node:path";
import type { AdapterExecutionContext, AdapterExecutionResult } from "@paperclip/adapter-utils";
import {
  asString,
  asNumber,
  asBoolean,
  asStringArray,
  parseObject,
  buildPaperclipEnv,
  redactEnvForLogs,
  ensureAbsoluteDirectory,
  ensureCommandResolvable,
  ensurePathInEnv,
  renderTemplate,
  runChildProcess,
} from "@paperclip/adapter-utils/server-utils";
import { parseCodexJsonl, isCodexUnknownSessionError } from "./parse.js";

export async function execute(ctx: AdapterExecutionContext): Promise<AdapterExecutionResult> {
  const { runId, agent, runtime, config, context, onLog, onMeta, authToken } = ctx;

  const promptTemplate = asString(
    config.promptTemplate,
    "You are agent {{agent.id}} ({{agent.name}}). Continue your Paperclip work.",
  );
  const bootstrapTemplate = asString(config.bootstrapPromptTemplate, promptTemplate);
  const command = asString(config.command, "codex");
  const model = asString(config.model, "");
  const search = asBoolean(config.search, false);
  const bypass = asBoolean(config.dangerouslyBypassApprovalsAndSandbox, false);

  const cwd = asString(config.cwd, process.cwd());
  await ensureAbsoluteDirectory(cwd);
  const envConfig = parseObject(config.env);
  const hasExplicitApiKey =
    typeof envConfig.PAPERCLIP_API_KEY === "string" && envConfig.PAPERCLIP_API_KEY.trim().length > 0;
  const env: Record<string, string> = { ...buildPaperclipEnv(agent) };
  env.PAPERCLIP_RUN_ID = runId;
  const wakeTaskId =
    (typeof context.taskId === "string" && context.taskId.trim().length > 0 && context.taskId.trim()) ||
    (typeof context.issueId === "string" && context.issueId.trim().length > 0 && context.issueId.trim()) ||
    null;
  const wakeReason =
    typeof context.wakeReason === "string" && context.wakeReason.trim().length > 0
      ? context.wakeReason.trim()
      : null;
  const approvalId =
    typeof context.approvalId === "string" && context.approvalId.trim().length > 0
      ? context.approvalId.trim()
      : null;
  const approvalStatus =
    typeof context.approvalStatus === "string" && context.approvalStatus.trim().length > 0
      ? context.approvalStatus.trim()
      : null;
  const linkedIssueIds = Array.isArray(context.issueIds)
    ? context.issueIds.filter((value): value is string => typeof value === "string" && value.trim().length > 0)
    : [];
  if (wakeTaskId) {
    env.PAPERCLIP_TASK_ID = wakeTaskId;
  }
  if (wakeReason) {
    env.PAPERCLIP_WAKE_REASON = wakeReason;
  }
  if (approvalId) {
    env.PAPERCLIP_APPROVAL_ID = approvalId;
  }
  if (approvalStatus) {
    env.PAPERCLIP_APPROVAL_STATUS = approvalStatus;
  }
  if (linkedIssueIds.length > 0) {
    env.PAPERCLIP_LINKED_ISSUE_IDS = linkedIssueIds.join(",");
  }
  for (const [k, v] of Object.entries(envConfig)) {
    if (typeof v === "string") env[k] = v;
  }
  if (!hasExplicitApiKey && authToken) {
    env.PAPERCLIP_API_KEY = authToken;
  }
  const runtimeEnv = ensurePathInEnv({ ...process.env, ...env });
  await ensureCommandResolvable(command, cwd, runtimeEnv);

  const timeoutSec = asNumber(config.timeoutSec, 1800);
  const graceSec = asNumber(config.graceSec, 20);
  const extraArgs = (() => {
    const fromExtraArgs = asStringArray(config.extraArgs);
    if (fromExtraArgs.length > 0) return fromExtraArgs;
    return asStringArray(config.args);
  })();

  const runtimeSessionParams = parseObject(runtime.sessionParams);
  const runtimeSessionId = asString(runtimeSessionParams.sessionId, runtime.sessionId ?? "");
  const runtimeSessionCwd = asString(runtimeSessionParams.cwd, "");
  const canResumeSession =
    runtimeSessionId.length > 0 &&
    (runtimeSessionCwd.length === 0 || path.resolve(runtimeSessionCwd) === path.resolve(cwd));
  const sessionId = canResumeSession ? runtimeSessionId : null;
  if (runtimeSessionId && !canResumeSession) {
    await onLog(
      "stderr",
      `[paperclip] Codex session "${runtimeSessionId}" was saved for cwd "${runtimeSessionCwd}" and will not be resumed in "${cwd}".\n`,
    );
  }
  const template = sessionId ? promptTemplate : bootstrapTemplate;
  const prompt = renderTemplate(template, {
    company: { id: agent.companyId },
    agent,
    run: { id: runId, source: "on_demand" },
    context,
  });

  const buildArgs = (resumeSessionId: string | null) => {
    const args = ["exec", "--json"];
    if (search) args.unshift("--search");
    if (bypass) args.push("--dangerously-bypass-approvals-and-sandbox");
    if (model) args.push("--model", model);
    if (extraArgs.length > 0) args.push(...extraArgs);
    if (resumeSessionId) args.push("resume", resumeSessionId, prompt);
    else args.push(prompt);
    return args;
  };

  const runAttempt = async (resumeSessionId: string | null) => {
    const args = buildArgs(resumeSessionId);
    if (onMeta) {
      await onMeta({
        adapterType: "codex_local",
        command,
        cwd,
        commandArgs: args.map((value, idx) => {
          if (idx === args.length - 1) return `<prompt ${prompt.length} chars>`;
          return value;
        }),
        env: redactEnvForLogs(env),
        prompt,
        context,
      });
    }

    const proc = await runChildProcess(runId, command, args, {
      cwd,
      env,
      timeoutSec,
      graceSec,
      onLog,
    });
    return {
      proc,
      parsed: parseCodexJsonl(proc.stdout),
    };
  };

  const toResult = (
    attempt: { proc: { exitCode: number | null; signal: string | null; timedOut: boolean; stdout: string; stderr: string }; parsed: ReturnType<typeof parseCodexJsonl> },
    clearSessionOnMissingSession = false,
  ): AdapterExecutionResult => {
    if (attempt.proc.timedOut) {
      return {
        exitCode: attempt.proc.exitCode,
        signal: attempt.proc.signal,
        timedOut: true,
        errorMessage: `Timed out after ${timeoutSec}s`,
        clearSession: clearSessionOnMissingSession,
      };
    }

    const resolvedSessionId = attempt.parsed.sessionId ?? runtimeSessionId ?? runtime.sessionId ?? null;
    const resolvedSessionParams = resolvedSessionId
      ? ({ sessionId: resolvedSessionId, cwd } as Record<string, unknown>)
      : null;

    return {
      exitCode: attempt.proc.exitCode,
      signal: attempt.proc.signal,
      timedOut: false,
      errorMessage:
        (attempt.proc.exitCode ?? 0) === 0
          ? null
          : `Codex exited with code ${attempt.proc.exitCode ?? -1}`,
      usage: attempt.parsed.usage,
      sessionId: resolvedSessionId,
      sessionParams: resolvedSessionParams,
      sessionDisplayId: resolvedSessionId,
      provider: "openai",
      model,
      costUsd: null,
      resultJson: {
        stdout: attempt.proc.stdout,
        stderr: attempt.proc.stderr,
      },
      summary: attempt.parsed.summary,
      clearSession: Boolean(clearSessionOnMissingSession && !resolvedSessionId),
    };
  };

  const initial = await runAttempt(sessionId);
  if (
    sessionId &&
    !initial.proc.timedOut &&
    (initial.proc.exitCode ?? 0) !== 0 &&
    isCodexUnknownSessionError(initial.proc.stdout, initial.proc.stderr)
  ) {
    await onLog(
      "stderr",
      `[paperclip] Codex resume session "${sessionId}" is unavailable; retrying with a fresh session.\n`,
    );
    const retry = await runAttempt(null);
    return toResult(retry, true);
  }

  return toResult(initial);
}