import path from "node:path";
import fs from "node:fs/promises";
import type { AdapterExecutionContext, AdapterExecutionResult } from "@agentcompany/adapter-utils";
import {
  asString,
  asNumber,
  asBoolean,
  redactEnvForLogs,
  ensureAbsoluteDirectory,
  ensureCommandResolvable,
  ensurePathInEnv,
  filterConflictingArgs,
  renderTemplate,
  runChildProcess,
} from "@agentcompany/adapter-utils/server-utils";
import { firstNonEmptyLine } from "@agentcompany/adapter-utils/test-utils";
import { parseCodexJsonl, isCodexUnknownSessionError } from "./parse.js";
import {
  stripCodexRolloutNoise,
  resolveCodexBillingType,
  ensureCodexSkillsInjected,
  parseManagedSkills,
  parseExtraArgs,
  buildCommonAgentCompanyEnv,
  resolveSessionResumeState,
} from "./execute-helpers.js";

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

  const promptTemplate = asString(
    config.promptTemplate,
    "{{context.taskTitle}}\n\n{{context.taskDescription}}",
  );
  const command = asString(config.command, "codex");
  const model = asString(config.model, "");
  const modelReasoningEffort = asString(
    config.modelReasoningEffort,
    asString(config.reasoningEffort, ""),
  );
  const search = asBoolean(config.search, false);
  const bypass = asBoolean(
    config.dangerouslyBypassApprovalsAndSandbox,
    asBoolean(config.dangerouslyBypassSandbox, false),
  );

  const { env, cwd, workspaceId, workspaceRepoUrl, workspaceRepoRef } =
    await buildCommonAgentCompanyEnv(
      { runId, agent, config, context, authToken },
      { ensureAbsoluteDirectory },
    );

  const managedSkills = parseManagedSkills(config);
  await ensureCodexSkillsInjected(managedSkills, onLog);

  const billingType = resolveCodexBillingType(env);
  const runtimeEnv = ensurePathInEnv(env);
  await ensureCommandResolvable(command, cwd, runtimeEnv);

  const timeoutSec = asNumber(config.timeoutSec, 0);
  const graceSec = asNumber(config.graceSec, 20);
  const extraArgs = parseExtraArgs(config);

  const { sessionId, runtimeSessionId, runtimeSessionCwd, canResumeSession } =
    resolveSessionResumeState(runtime, cwd);
  if (runtimeSessionId && !canResumeSession) {
    await onLog(
      "stderr",
      `[agent-company] Codex session "${runtimeSessionId}" was saved for cwd "${runtimeSessionCwd}" and will not be resumed in "${cwd}".\n`,
    );
  }

  const instructionsFilePath = asString(config.instructionsFilePath, "").trim();
  const instructionsDir = instructionsFilePath ? `${path.dirname(instructionsFilePath)}/` : "";
  let instructionsPrefix = "";
  if (instructionsFilePath) {
    try {
      const instructionsContents = await fs.readFile(instructionsFilePath, "utf8");
      instructionsPrefix =
        `${instructionsContents}\n\n` +
        `The above agent instructions were loaded from ${instructionsFilePath}. ` +
        `Resolve any relative file references from ${instructionsDir}.\n\n`;
      await onLog(
        "stderr",
        `[agent-company] Loaded agent instructions file: ${instructionsFilePath}\n`,
      );
    } catch (err) {
      const reason = err instanceof Error ? err.message : String(err);
      await onLog(
        "stderr",
        `[agent-company] Warning: could not read agent instructions file "${instructionsFilePath}": ${reason}\n`,
      );
    }
  }
  const commandNotes = (() => {
    if (!instructionsFilePath) return [] as string[];
    if (instructionsPrefix.length > 0) {
      return [
        `Loaded agent instructions from ${instructionsFilePath}`,
        `Prepended instructions + path directive to stdin prompt (relative references from ${instructionsDir}).`,
      ];
    }
    return [
      `Configured instructionsFilePath ${instructionsFilePath}, but file could not be read; continuing without injected instructions.`,
    ];
  })();
  const renderedPrompt = renderTemplate(promptTemplate, {
    agentId: agent.id,
    companyId: agent.companyId,
    runId,
    company: { id: agent.companyId },
    agent,
    run: { id: runId, source: "on_demand" },
    context,
  });
  const prompt = `${instructionsPrefix}${renderedPrompt}`;

  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 (modelReasoningEffort) args.push("-c", `model_reasoning_effort=${JSON.stringify(modelReasoningEffort)}`);
    if (extraArgs.length > 0) {
      const managedFlags = [
        "--dangerously-bypass-approvals-and-sandbox",
        "--json",
        "--model",
        "--sandbox",
        "--skip-git-repo-check",
        "--ask-for-approval",
      ];
      const cleaned = filterConflictingArgs(extraArgs, managedFlags);
      if (cleaned.length > 0) args.push(...cleaned);
    }
    if (resumeSessionId) args.push("resume", resumeSessionId, "-");
    else args.push("-");
    return args;
  };

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

    const proc = await runChildProcess(runId, command, args, {
      cwd,
      env,
      stdin: prompt,
      timeoutSec,
      graceSec,
      onLog: async (stream, chunk) => {
        if (stream !== "stderr") {
          await onLog(stream, chunk);
          return;
        }
        const cleaned = stripCodexRolloutNoise(chunk);
        if (!cleaned.trim()) return;
        await onLog(stream, cleaned);
      },
    });
    const cleanedStderr = stripCodexRolloutNoise(proc.stderr);
    return {
      proc: {
        ...proc,
        stderr: cleanedStderr,
      },
      rawStderr: proc.stderr,
      parsed: parseCodexJsonl(proc.stdout),
    };
  };

  const toResult = (
    attempt: { proc: { exitCode: number | null; signal: string | null; timedOut: boolean; stdout: string; stderr: string }; rawStderr: 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,
        ...(workspaceId ? { workspaceId } : {}),
        ...(workspaceRepoUrl ? { repoUrl: workspaceRepoUrl } : {}),
        ...(workspaceRepoRef ? { repoRef: workspaceRepoRef } : {}),
      } as Record<string, unknown>)
      : null;
    const parsedError = typeof attempt.parsed.errorMessage === "string" ? attempt.parsed.errorMessage.trim() : "";
    const stderrLine = firstNonEmptyLine(attempt.proc.stderr);
    const fallbackErrorMessage =
      parsedError ||
      stderrLine ||
      `Codex exited with code ${attempt.proc.exitCode ?? -1}`;

    return {
      exitCode: attempt.proc.exitCode,
      signal: attempt.proc.signal,
      timedOut: false,
      errorMessage:
        (attempt.proc.exitCode ?? 0) === 0
          ? null
          : fallbackErrorMessage,
      usage: attempt.parsed.usage,
      sessionId: resolvedSessionId,
      sessionParams: resolvedSessionParams,
      sessionDisplayId: resolvedSessionId,
      provider: "openai",
      model,
      billingType,
      costUsd: attempt.parsed.costUsd,
      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.rawStderr)
  ) {
    await onLog(
      "stderr",
      `[agent-company] Codex resume session "${sessionId}" is unavailable; retrying with a fresh session.\n`,
    );
    const retry = await runAttempt(null);
    return toResult(retry, true);
  }

  return toResult(initial);
}