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197// Terminal trees preserve the rail, fly-out, tab menus and session grid from the JavaScript UI.
// Typed factories keep formatting from introducing HTM whitespace nodes; handlers use scoped effects.
import { h } from "convergence";
import type { DivProps, IconName, SpacingStep, Terminal } from "convergence";
import type { EffectViewContext } from "convergence/effect";
import type { Controller } from "./controller.ts";
import { activeTerminal, forWorkspace, terminalInPane } from "./state.ts";

const TAB_MAX_WIDTH = 200;
const column = { display: "flex", flexDirection: "column" } satisfies DivProps;
const row = { display: "flex", flexDirection: "row", alignItems: "center" } satisfies DivProps;
const fill = { flexGrow: 1, flexShrink: 1, flexBasis: "0%", minWidth: 0, minHeight: 0 } satisfies DivProps;
const full = { width: "100%", height: "100%" } satisfies DivProps;
const HOVER = { background: "hover" } satisfies DivProps;
const clickable = { group: "hover", cursor: "pointer" } satisfies DivProps;
const keep = { flexGrow: 0, flexShrink: 0, flexBasis: "auto" } satisfies DivProps;

function centered(padding: SpacingStep, text: string) {
  return h(
    "div",
    { ...column, ...fill, ...full, marginX: "auto", gap: "small", padding },
    h("text", { style: "muted" }, text),
  );
}

export function renderRail(controller: Controller, ctx: EffectViewContext<object>) {
  if (!controller.state.ready) return null;
  const running = forWorkspace(controller.state.terminals, ctx.app.workspaceId).filter(
    (terminal) => terminal.running,
  ).length;
  return h("button", {
    id: "rail-terminal",
    icon: "square-terminal",
    variant: "ghost",
    active: Boolean(terminalInPane(controller.state.activeTab)),
    badge: running > 1 ? String(running) : undefined,
    tooltip: "Terminal",
    onClick: () => {},
  });
}

export function renderFlyOut(controller: Controller, ctx: EffectViewContext<object>) {
  const { state, update } = controller;
  if (!state.ready || ctx.app.shared?.rightPanelPreview !== "terminal") return null;
  const workspaceId = ctx.app.workspaceId;
  if (!workspaceId) return centered("medium", "Open a workspace to use the terminal.");
  const mine = forWorkspace(state.terminals, workspaceId);
  const active = activeTerminal(state, workspaceId);
  if (!active) return centered("medium", "Starting…");
  const menuAction = (id: string, icon: IconName, label: string, onClick: () => void) =>
    h("button", { id, icon, label, variant: "ghost", small: true, onClick });
  function renderTab(terminal: Terminal, active: boolean) {
    if (state.renaming === terminal.id)
      return h(
        "div",
        {
          ...row,
          padding: "small",
          paddingX: "small",
          background: "muted",
          borderRadius: "sm",
          width: TAB_MAX_WIDTH,
          flexShrink: 0,
        },
        h("input", {
          id: `terminal-rename-${terminal.id}`,
          value: terminal.title,
          ghost: true,
          submitOnEnter: true,
          onSubmit: (event) => ctx.run(controller.rename(terminal, event.value)),
        }),
      );
    return h(
      "popover",
      {
        id: `terminal-menu-${terminal.id}`,
        open: state.menu === terminal.id,
        width: 190,
        onDismiss: () => {
          state.menu = null;
          update();
        },
      },
      h(
        "div",
        {
          ...row,
          ...clickable,
          id: `terminal-tab-${terminal.id}`,
          gap: "small",
          padding: "small",
          paddingX: "small",
          paddingY: "small",
          borderRadius: "sm",
          maxWidth: TAB_MAX_WIDTH,
          background: active ? "accent" : undefined,
          hover: active ? undefined : HOVER,
          onClick: () => {
            state.activeByWorkspace[String(terminal.workspaceId)] = terminal.id;
            update();
          },
          onSecondaryClick: () => {
            state.menu = terminal.id;
            update();
          },
        },
        h("icon", { name: "square-terminal", small: true, tone: active ? "foreground" : "muted" }),
        h(
          "text",
          {
            style: "body",
            size: "xs",
            bold: active,
            tone: terminal.running ? (active ? "foreground" : "muted") : "danger",
            truncate: true,
          },
          terminal.title,
        ),
        h("button", {
          id: `terminal-close-${terminal.id}`,
          icon: "x",
          variant: "ghost",
          small: true,
          tooltip: "Close terminal",
          onClick: () => ctx.run(controller.close(terminal)),
        }),
      ),
      h(
        "div",
        { ...column, padding: "small" },
        menuAction(`terminal-rename-action-${terminal.id}`, "pencil", "Rename terminal", () =>
          ctx.run(controller.startRename(terminal)),
        ),
        menuAction(`terminal-popout-action-${terminal.id}`, "maximize", "Open in a tab", () =>
          ctx.run(controller.popOut(terminal)),
        ),
        menuAction(`terminal-close-action-${terminal.id}`, "x", "Close terminal", () =>
          ctx.run(controller.close(terminal)),
        ),
      ),
    );
  }
  return h(
    "div",
    { ...column, ...fill, ...full, padding: "small" },
    h(
      "div",
      { ...row, gap: "small", padding: "small", paddingX: "small", paddingY: "small" },
      h(
        "div",
        {
          ...row,
          ...fill,
          id: "terminal-tabs",
          reveal: Math.max(
            0,
            mine.findIndex((terminal) => terminal.id === active.id),
          ),
          gap: "small",
          padding: "small",
          overflowX: "scroll",
        },
        mine.map((terminal) => h("div", { key: terminal.id, ...keep }, renderTab(terminal, terminal.id === active.id))),
        h(
          "div",
          { key: "new", ...keep },
          h("button", {
            id: "terminal-new",
            icon: "plus",
            variant: "ghost",
            small: true,
            tooltip: "New terminal",
            onClick: () => ctx.run(controller.create(active.workspaceId)),
          }),
        ),
      ),
      !active.running
        ? h("text", { style: "body", size: "xs", tone: "muted" }, `exited ${active.exitCode ?? 0}`)
        : null,
      h("button", {
        id: "terminal-popout",
        icon: "maximize",
        variant: "ghost",
        small: true,
        tooltip: "Open in a tab",
        onClick: () => ctx.run(controller.popOut(active)),
      }),
    ),
    terminalInPane(state.activeTab) === active.id
      ? centered("large", "This terminal is open in the tabbed pane.")
      : h(
          "div",
          { ...column, ...fill, ...full, gap: "small", padding: "small", paddingX: "small" },
          h("terminal", { terminal: active.id }),
        ),
  );
}