import { writeFileSync, mkdirSync } from "node:fs";
import { join } from "node:path";
import type { Role, RoleResult } from "@uncaged/nerve-core";
import { isDryRun, spawnSafe } from "@uncaged/nerve-workflow-utils";

export type CommitterMeta = {
  success: boolean;
};

export type BuildCommitterDeps = {
  nerveRoot: string;
};

function logPath(nerveRoot: string): string {
  return join(nerveRoot, "logs", `committer-${Date.now()}.log`);
}

function writeLog(path: string, content: string): void {
  mkdirSync(join(path, ".."), { recursive: true });
  writeFileSync(path, content, "utf-8");
}

export function buildCommitterRole({ nerveRoot }: BuildCommitterDeps): Role<CommitterMeta> {
  return async (start, _messages) => {
    const dry = isDryRun(start);
    const file = logPath(nerveRoot);

    if (dry) {
      writeLog(file, "[dry-run] committer skipped\n");
      return {
        content: `[dry-run] committer skipped — log: ${file}`,
        meta: { success: true },
      } satisfies RoleResult<CommitterMeta>;
    }

    const lines: string[] = [];
    let success = true;

    const run = async (cmd: string, args: string[]): Promise<boolean> => {
      const r = await spawnSafe(cmd, args, { cwd: nerveRoot, env: null, timeoutMs: 60_000, dryRun: false });
      if (r.ok) {
        lines.push(`$ ${cmd} ${args.join(" ")}`);
        if (r.value.stdout) lines.push(r.value.stdout);
        if (r.value.stderr) lines.push(r.value.stderr);
        lines.push("");
        return true;
      }
      const e = r.error;
      lines.push(`$ ${cmd} ${args.join(" ")} — FAILED`);
      if (e.kind === "non_zero_exit") {
        lines.push(`exit ${e.exitCode}`);
        if (e.stdout) lines.push(e.stdout);
        if (e.stderr) lines.push(e.stderr);
      } else if (e.kind === "timeout") {
        lines.push("timeout");
        if (e.stdout) lines.push(e.stdout);
        if (e.stderr) lines.push(e.stderr);
      } else {
        lines.push(e.message);
      }
      lines.push("");
      return false;
    };

    await run("git", ["add", "-A"]);
    // Use a generic message; git diff will show what actually changed
    const committed = await run("git", ["commit", "-m", "chore(workflow): auto-generated commit"]);
    if (!committed) {
      success = false;
    } else {
      const pushed = await run("git", ["push"]);
      if (!pushed) success = false;
    }

    const log = lines.join("\n");
    writeLog(file, log);

    const summary = success ? "committed and pushed" : "commit/push failed — see log";
    return {
      content: `committer: ${summary}\nLog: ${file}`,
      meta: { success },
    } satisfies RoleResult<CommitterMeta>;
  };
}