# All files / src/components/chat ChatInput.tsx

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     import {
      useState,
      useLayoutEffect,
      useRef,
      type FormEvent,
      type KeyboardEvent,
      type JSX,
    } from "react";
    import type { ToastVariant } from "../../context/ToastContext.js";
    import type { Environment, PersonaData } from "../../hooks/types.js";
    import styles from "./ChatInput.module.scss";

    /**
     * Maximum height (px) the composer grows to before scrolling internally.
     * Must stay in sync with `max-height` on `.textarea` in ChatInput.module.scss.
     */
    const MAX_COMPOSER_HEIGHT_PX: number = 200;

    // --- Helpers ---

    /** Returns true when the environment with the given ID is disconnected or in error. */
    function isEnvDisconnected(
      environmentId: string | undefined,
      environments: Environment[],
    ): boolean {
      if (!environmentId) {
        return false;
      }
      const env = environments.find((e) => e.id === environmentId);
      return env !== undefined && (env.status === "disconnected" || env.status === "error");
    }

    // --- Subcomponents ---

    interface DisconnectedBannerProps {
      environmentId: string;
      onReconnect: (envId: string) => void;
    }

    /** Hint + Reconnect button shown when the task/session environment is unreachable. */
    function DisconnectedBanner({ environmentId, onReconnect }: DisconnectedBannerProps): JSX.Element {
      return (
        <>
          <span className={styles.disconnectHint} data-testid="env-disconnect-hint">
            Environment unavailable
          </span>
          <button
            type="button"
            onClick={() => onReconnect(environmentId)}
            className={styles.btnGhost}
            data-testid="reconnect-btn"
            title="Reconnect the environment to resume messaging"
          >
            Reconnect
          </button>
        </>
      );
    }

    /** Props for the auto-resizing chat composer textarea. */
    interface ComposerTextAreaProps {
      /** Current text value. */
      value: string;
      /** Called on every keystroke with the new value. */
      onChange: (value: string) => void;
      /** Called when the user submits via Enter (Shift+Enter inserts a newline). */
      onSubmit: () => void;
      /** Placeholder text shown when empty. */
      placeholder: string;
      /** Whether the textarea is disabled. */
      disabled?: boolean;
      /** Whether to auto-focus the textarea on mount. */
      autoFocus?: boolean;
      /** Accessible label for the textarea. */
      ariaLabel: string;
    }

    /**
     * Auto-resizing multiline chat composer.
     *
     * Enter submits; Shift+Enter inserts a newline (the Send button submits too).
     * The textarea grows with its content up to {@link MAX_COMPOSER_HEIGHT_PX}, then
     * scrolls internally.
     */
    function ComposerTextArea({
      value,
      onChange,
      onSubmit,
      placeholder,
      disabled,
      autoFocus,
      ariaLabel,
    }: ComposerTextAreaProps): JSX.Element {
      const ref = useRef<HTMLTextAreaElement>(null);

      // Auto-resize: collapse to measure natural height, then grow to fit (capped).
      useLayoutEffect(() => {
        const el = ref.current;
        if (!el) {
          return;
        }
        el.style.height = "auto";
        el.style.height = `${Math.min(el.scrollHeight, MAX_COMPOSER_HEIGHT_PX)}px`;
      }, [value]);

      const handleKeyDown = (e: KeyboardEvent<HTMLTextAreaElement>): void => {
        // Enter submits; Shift+Enter falls through to insert a newline.
        // The isComposing guard avoids submitting mid-IME composition (e.g. CJK input).
        if (e.key === "Enter" && !e.shiftKey && !e.repeat && !e.nativeEvent.isComposing) {
          e.preventDefault();
          onSubmit();
        }
      };

      return (
        <textarea
          ref={ref}
          rows={1}
          value={value}
          onChange={(e) => onChange(e.target.value)}
          onKeyDown={handleKeyDown}
          placeholder={placeholder}
          disabled={disabled}
          autoFocus={autoFocus}
          className={styles.textarea}
          aria-label={ariaLabel}
        />
      );
    }

    // --- Main component ---

    /** Chat input mode determines the action performed on submit. */
    export interface ChatInputProps {
      /** "send" = sendInput to existing session, "spawn" = create new session, "start" = start a task */
      mode: "send" | "spawn" | "start";
      /** Session ID to send input to (mode="send") */
      sessionId?: string;
      /** Environment ID (mode="spawn" and "start") */
      environmentId?: string;
      /** Task ID to start (mode="start") */
      taskId?: string;
      /** Show persona selector dropdown (mode="spawn") */
      showPersonaSelect?: boolean;
      /** All personas (for persona selector in spawn mode). */
      personas: PersonaData[];
      /** All environments (for disconnect detection). */
      environments: Environment[];
      /** Send text input to an existing session. */
      onSendInput: (sessionId: string, text: string) => void;
      /** Spawn a new session. */
      onSpawn: (environmentId: string, prompt: string, personaId?: string) => void;
      /** Start a task. */
      onStartTask: (taskId: string, personaId?: string, environmentId?: string, notes?: string) => void;
      /** Reconnect a disconnected environment. */
      onProvisionEnvironment: (environmentId: string) => void;
      /** Display a toast notification. */
      onShowToast?: (message: string, variant?: ToastVariant) => void;
    }

    /** Reusable form component for sending messages to agent sessions. */
    export function ChatInput({
      mode,
      sessionId,
      environmentId,
      taskId,
      showPersonaSelect,
      personas,
      environments,
      onSendInput,
      onSpawn,
      onStartTask,
      onProvisionEnvironment,
      onShowToast,
    }: ChatInputProps): JSX.Element {
      const [text, setText] = useState("");
      const [spawnPersonaId, setSpawnPersonaId] = useState("");

      const envDisconnected = isEnvDisconnected(environmentId, environments);

      /** Performs the mode-specific submit action. Called by the form and Enter key. */
      const submit = (): void => {
        if (!text.trim()) {
          return;
        }

        if (mode === "send") {
          if (!sessionId || envDisconnected) {
            return;
          }
          onSendInput(sessionId, text);
          setText("");
        } else if (mode === "spawn") {
          if (!environmentId) {
            return;
          }
          onSpawn(environmentId, text, spawnPersonaId);
          onShowToast?.("Session started", "success");
          setText("");
          setSpawnPersonaId("");
        } else {
          // mode === "start"
          if (!taskId) {
            return;
          }
          onStartTask(taskId, undefined, environmentId, text);
          setText("");
        }
      };

      const handleSubmit = (e: FormEvent): void => {
        e.preventDefault();
        submit();
      };

      // --- spawn mode ---
      if (mode === "spawn") {
        return (
          <form onSubmit={handleSubmit} className={styles.bar}>
            <span className={styles.badge}>new chat</span>
            <ComposerTextArea
              value={text}
              onChange={setText}
              onSubmit={submit}
              placeholder="Enter prompt..."
              autoFocus
              ariaLabel="Enter prompt"
            />
            {showPersonaSelect && (
              <select
                value={spawnPersonaId}
                onChange={(e) => setSpawnPersonaId(e.target.value)}
                className={styles.select}
                aria-label="Select persona"
              >
                <option value="">(Default)</option>
                {personas.map((p) => (
                  <option key={p.id} value={p.id}>
                    {p.name}
                  </option>
                ))}
              </select>
            )}
            <button
              type="submit"
              disabled={!text.trim() || !environmentId}
              className={styles.btnPrimary}
            >
              Go
            </button>
          </form>
        );
      }

      // --- start mode ---
      if (mode === "start") {
        return (
          <form onSubmit={handleSubmit} className={styles.bar}>
            <ComposerTextArea
              value={text}
              onChange={setText}
              onSubmit={submit}
              placeholder="Type a message..."
              autoFocus
              ariaLabel="Type a message"
            />
            <button type="submit" disabled={!text.trim()} className={styles.btnPrimary}>
              Send
            </button>
          </form>
        );
      }

      // --- send mode ---
      return (
        <form onSubmit={handleSubmit} className={styles.bar}>
          {envDisconnected && environmentId && (
            <DisconnectedBanner environmentId={environmentId} onReconnect={onProvisionEnvironment} />
          )}
          <ComposerTextArea
            value={text}
            onChange={setText}
            onSubmit={submit}
            placeholder="Type a message..."
            autoFocus={!envDisconnected}
            disabled={envDisconnected}
            ariaLabel="Type a message"
          />
          <span title={envDisconnected ? "Environment is unavailable — reconnect first" : undefined}>
            <button
              type="submit"
              disabled={!text.trim() || envDisconnected}
              className={styles.btnPrimary}
            >
              Send
            </button>
          </span>
        </form>
      );
    }