// <TermInput> — the fixed composer at the bottom of the page. Sends a
// plain message to this agent's own turn loop (`POST send`), or
// intercepts a `/slash` command locally (never sent to the agent).
// Ported from app.js's `renderTermInput`/`handleSlashCommand`/
// `completeSlash`, with one deliberate UX change: `/new-session` and
// `/logout` used to pop the old shadow-DOM `themedConfirm` modal
// (@hive/shared/modal.js) before firing — this rewrite's destructive
// actions all avoid that widget family (see SidePanel.tsx's/
// useConfirmClick.ts's file comments for why), and a modal doesn't fit
// a text-input flow anyway. Instead: typing the command once arms it
// (a local note explains what confirming does), typing it again within
// the same "armed" state fires it — a keyboard-native two-step confirm.
import { useRef, useState } from "preact/hooks";
import { postModel, postEffort } from "../lib/modelEffort.js";
import {
  postCancelTurn,
  postCompact,
  postNewSession,
  postLogout,
  postSend,
} from "../lib/termActions.js";

export interface TermInputProps {
  label: string;
  online: boolean;
  onLocalNote: (text: string) => void;
  onClear: () => void;
}

const SLASH_COMMANDS: { name: string; desc: string }[] = [
  { name: "/help", desc: "list slash commands" },
  { name: "/clear", desc: "wipe the terminal panel (local-only)" },
  { name: "/cancel", desc: "SIGINT the in-flight claude turn" },
  { name: "/compact", desc: "compact the persistent claude session" },
  {
    name: "/model",
    desc: "/model <name>  — switch claude model for future turns",
  },
  {
    name: "/effort",
    desc: "/effort <level>  — set claude effort (medium/high/xhigh) for future turns",
  },
  {
    name: "/new-session",
    desc: "fresh claude session next turn (type twice to confirm)",
  },
  {
    name: "/logout",
    desc: "rotate OAuth creds + park in needs-login (type twice to confirm)",
  },
];

const MAX_PX = 12 * 16; // ~8 lines @ 1.5 line-height, 1em base

function completeSlash(prefix: string): string | null {
  const matches = SLASH_COMMANDS.filter((c) => c.name.startsWith(prefix));
  if (!matches.length) return null;
  const idx = matches.findIndex((c) => c.name === prefix);
  return matches[(idx + 1) % matches.length].name;
}

export function TermInput({
  label,
  online,
  onLocalNote,
  onClear,
}: TermInputProps) {
  const [value, setValue] = useState("");
  const taRef = useRef<HTMLTextAreaElement>(null);
  // Which destructive command is currently "armed" (typed once, waiting
  // for the confirming repeat) — any other command clears it.
  const armedRef = useRef<string | null>(null);

  function grow() {
    const ta = taRef.current;
    if (!ta) return;
    ta.style.height = "auto";
    ta.style.height = Math.min(ta.scrollHeight, MAX_PX) + "px";
  }

  function reportFailure(label_: string, detail?: string) {
    onLocalNote(`✗ ${label_} failed${detail ? ": " + detail : ""}`);
  }

  function handleSlash(line: string): boolean {
    const trimmed = line.trim();
    const [cmd, ...rest] = trimmed.split(/\s+/);
    const arg = rest.join(" ");
    const wasArmed = armedRef.current === cmd;
    armedRef.current = null;

    switch (cmd) {
      case "/help":
        onLocalNote("/help");
        for (const c of SLASH_COMMANDS)
          onLocalNote(`    ${c.name.padEnd(13)} — ${c.desc}`);
        return true;
      case "/clear":
        onClear();
        onLocalNote(
          "· terminal cleared (local view only — server history kept)",
        );
        return true;
      case "/cancel":
        postCancelTurn().then(
          (r) => !r.ok && reportFailure("/cancel", r.detail),
        );
        return true;
      case "/compact":
        postCompact().then((r) => !r.ok && reportFailure("/compact", r.detail));
        return true;
      case "/new-session":
        if (wasArmed) {
          postNewSession().then(
            (r) => !r.ok && reportFailure("/new-session", r.detail),
          );
        } else {
          armedRef.current = "/new-session";
          onLocalNote(
            "⚠ drops all prior --continue context. type /new-session again to confirm.",
          );
        }
        return true;
      case "/logout":
        if (wasArmed) {
          postLogout().then((r) => !r.ok && reportFailure("/logout", r.detail));
        } else {
          armedRef.current = "/logout";
          onLocalNote(
            "⚠ SIGINTs the current turn + rotates OAuth credentials. type /logout again to confirm.",
          );
        }
        return true;
      case "/model":
        if (!arg)
          onLocalNote(
            "✗ /model needs a name (e.g. /model haiku, /model sonnet, /model opus)",
          );
        else
          postModel(arg).then(
            (r) => !r.ok && reportFailure("/model", r.detail),
          );
        return true;
      case "/effort":
        if (!arg)
          onLocalNote(
            "✗ /effort needs a level (e.g. /effort medium, /effort high, /effort xhigh)",
          );
        else
          postEffort(arg).then(
            (r) => !r.ok && reportFailure("/effort", r.detail),
          );
        return true;
      default:
        onLocalNote(`✗ unknown slash command: ${cmd} — try /help`);
        return true;
    }
  }

  function submit() {
    const line = value;
    if (!line.trim()) return;
    setValue("");
    requestAnimationFrame(grow);
    if (line.trim().startsWith("/")) {
      handleSlash(line);
      return;
    }
    armedRef.current = null;
    postSend(line).then((r) => !r.ok && reportFailure("send", r.detail));
  }

  function onInput(e: Event) {
    setValue((e.currentTarget as HTMLTextAreaElement).value);
    grow();
  }

  function onKeyDown(e: KeyboardEvent) {
    if (e.key === "Tab" && value.startsWith("/") && !value.includes(" ")) {
      const next = completeSlash(value);
      if (next) {
        e.preventDefault();
        setValue(next);
      }
      return;
    }
    if (e.key === "Enter" && !e.shiftKey && !e.isComposing) {
      e.preventDefault();
      submit();
    }
  }

  return (
    <div class={`term-input${online ? "" : " disabled"}`}>
      <form
        class="sendform-term"
        onSubmit={(e) => {
          e.preventDefault();
          submit();
        }}
      >
        <span class="prompt">operator@{label} ▸</span>
        <textarea
          ref={taRef}
          value={value}
          placeholder={`message ${label}…`}
          rows={1}
          disabled={!online}
          autocomplete="off"
          onInput={onInput}
          onKeyDown={onKeyDown}
        />
        <span class="submit-hint">↵ send · ⇧↵ newline · /help</span>
      </form>
    </div>
  );
}