src/ui/chrome.py

"""The Atlas's bridge vocabulary and its own CSS.

Everything shared with the other Spaces — the sidebar, the palette, the
dialogs, the design system's stylesheets, the click bridge mechanism — comes
from `bit_ui`. This module is the thin Atlas-specific layer on top: the actions
this Space accepts, and the CSS for the parts of the design only this Space
has.
"""

from __future__ import annotations

from bit_ui import bridge, theme

# Actions this Space accepts, on top of the ones bit-ui's own chrome emits.
# An action off this list is dropped by the bridge, so a hand-crafted click
# cannot reach a code path the UI does not offer.
ATLAS_KEYS = frozenset({
    "task",         # toggle a task filter chip
    "asset",        # toggle an asset-class filter chip
    "lic",          # toggle a license-bucket filter row
    "verified",     # toggle "verified by Bit Trading"
    "maintained",   # toggle "maintained only" -- the graveyard switch
    "haseval",      # toggle "has evaluation"
    "hasdata",      # toggle "has documented training data"
    "sort",         # choose a sort order
    "clear",        # clear every filter
    "graveyard",    # show unmaintained models
    "open",         # open a model's detail drawer
    "close",        # close the drawer
    "suggest",      # submit a model suggestion
    "q",            # the search box (arrives live as q=<text>)
    "suggestbox",   # the suggestion input (arrives as suggestbox=<text>)
})

# `sidebar` is deliberately absent: collapsing is a client-side attribute flip
# in bit_ui.bridge, not a server action. Re-adding it would put a 1.16 MB
# re-render behind a purely visual toggle.
ALLOWED_KEYS = (bridge.SHARED_KEYS - {"sidebar"}) | ATLAS_KEYS

emit = bridge.make_emitter(ALLOWED_KEYS)


def parse_action(raw):
    return bridge.parse_action(raw, ALLOWED_KEYS)


# --------------------------------------------------------------------------
# Atlas-only CSS
# --------------------------------------------------------------------------
#
# Deliberately short. The design expresses almost everything as inline styles
# on its own elements, and the shared hover/scroll/animation rules live in
# bit_ui.theme. What is left is what only this Space has.

ATLAS_CSS = """
/* The page root. Was inline on the div; here so `.bit-atlas` is a real hook
   for Space-specific overrides rather than a bare marker class.
   Deliberately no min-height in vh -- see bit_ui.theme. */
.bit-atlas {
  background: var(--bg-canvas);
  color: var(--text-primary);
  display: flex;
  align-items: stretch;
  font-family: var(--font-body);
  font-size: var(--text-base);
}

/* The header sticks under nothing, so top:0; the rail is z-index 30 and wins
   where they meet. A solid background matters: rows scroll underneath it. */
.bit-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--bg-panel);
}

/* The model table scrolls horizontally inside its own panel rather than
   making the page scroll sideways. */
.bit-table-scroll { overflow-x: auto; }

/* Zones stack below the design's own breakpoint. */
@media (max-width: 1280px) {
  .bit-rail, .bit-rail-right {
    width: 100% !important; flex: 1 1 100% !important; position: static !important;
  }
  .bit-zones { flex-wrap: wrap !important; }
}
@media (max-width: 900px) {
  .bit-foot-grid { grid-template-columns: 1fr !important; }
}

/* ------------------------------------------------------------------ *
 * Model table rows.
 *
 * These are classes rather than inline styles for one reason: the row is
 * the only markup that repeats 300 times. The design's inline styles came
 * to 2,644 characters per row -- ~793 KB of identical repetition per
 * render, and 95% of the whole page payload. Every Gradio action re-sends
 * the page, so that weight was paid on every filter, sort and click.
 *
 * The VALUES below are the design's, unchanged. Only where they live has
 * moved. Everything that varies per row is an enumerable variant
 * (verified / selected / licence bucket / age band / trend direction), so
 * no row needs an inline style at all.
 * ------------------------------------------------------------------ */

.bit-row {
  display: grid;
  grid-template-columns: minmax(230px,2.4fr) 104px 92px 148px 60px 116px 104px 112px;
  align-items: center;
  border-bottom: 1px solid var(--border-subtle);
  border-left: 2px solid transparent;
  background: transparent;
  cursor: pointer;
}
.bit-row:hover { background: var(--bg-raised); }
.bit-row-verified { border-left-color: var(--accent-amber); }
.bit-row-selected { background: var(--bg-raised); }
.bit-row:focus-visible { outline: 2px solid var(--accent-amber);
                         outline-offset: -2px; }

.bit-cell { padding: 6px 8px; border-right: 1px solid var(--border-subtle);
            min-width: 0; }
.bit-cell-end { border-right: none; }
.bit-cell-r { text-align: right; }

.bit-model { display: flex; align-items: center; gap: 8px; }
.bit-avatar {
  flex: 0 0 auto; width: 20px; height: 20px; display: flex;
  align-items: center; justify-content: center; font-size: 9px;
  background: var(--stone-700); color: var(--text-secondary);
}
.bit-row-verified .bit-avatar { background: var(--accent-amber);
                                color: var(--stone-950); }
.bit-model-text { min-width: 0; display: flex; flex-direction: column; gap: 1px; }
.bit-id { font-size: var(--text-xs); color: var(--text-primary);
          white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.bit-sub { font-size: var(--text-2xs); color: var(--text-tertiary);
           white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.bit-tag {
  display: inline-flex; align-items: center; gap: 3px; padding: 1px 5px;
  border: 1px solid var(--border-default); color: var(--text-secondary);
  font-family: var(--font-mono); font-size: var(--text-2xs);
  white-space: nowrap; max-width: 100%; overflow: hidden;
}
.bit-tag-asset { border-color: var(--border-subtle); background: var(--bg-raised); }
.bit-tag-lic-permissive { border-color: var(--accent-moss-dim);
                          color: var(--accent-moss-strong); }
.bit-tag-lic-restricted { border-color: var(--accent-amber-dim);
                          color: var(--accent-amber-strong); }
.bit-tag-lic-none { border-color: var(--mute-red); color: var(--mute-red); }

.bit-dl { display: flex; align-items: center; gap: 7px;
          justify-content: flex-end; }
.bit-num { font-size: var(--text-xs); color: var(--text-primary);
           white-space: nowrap; }
.bit-likes { font-size: var(--text-xs); color: var(--text-secondary); }
.bit-spark { flex: 0 0 auto; }
.bit-spark-up path { stroke: var(--fin-up); }
.bit-spark-down path { stroke: var(--fin-down); }
.bit-nodata { font-size: var(--text-2xs); color: var(--text-tertiary);
              width: 44px; text-align: center; flex: 0 0 auto; }

.bit-agecell { display: flex; align-items: center; gap: 5px; }
.bit-age { font-size: var(--text-xs); white-space: nowrap; }
.bit-age-glyph { font-size: var(--text-2xs); }
.bit-age-fresh, .bit-age-fresh .bit-age { color: var(--fin-up); }
.bit-age-warn,  .bit-age-warn .bit-age  { color: var(--accent-amber-strong); }
.bit-age-stale, .bit-age-stale .bit-age { color: var(--fin-down); }
.bit-age-none,  .bit-age-none .bit-age  { color: var(--text-tertiary); }

.bit-badges { display: flex; align-items: center; gap: 4px; }
.bit-badge {
  display: inline-flex; align-items: center; gap: 3px; padding: 1px 4px;
  border: 1px solid var(--border-default); background: transparent;
  color: var(--text-secondary); font-family: var(--font-mono);
  font-size: var(--text-2xs); white-space: nowrap;
}
.bit-badge-verified { border-color: var(--accent-amber);
                      background: var(--accent-amber-dim);
                      color: var(--text-primary); }
.bit-badge-flag { border-color: var(--accent-amber-dim);
                  color: var(--accent-amber-strong); }
.bit-badge-unclear { color: var(--text-tertiary); }
"""


def full_css() -> str:
    return theme.full_css(ATLAS_CSS)