#!/usr/bin/env bash

# Choosing an accent must recolor libadwaita applications too.
#
# Files, Papers and Loupe read their accent from the Settings portal, so an
# accent that never reaches GNOME's accent-color key leaves half the desktop in
# GNOME blue while the other half wears the chosen color. That is invisible from
# inside Panama's own surfaces, which look correct either way.
#
# Three things have to line up, and none of them share a source:
#   - services/ThemeProfileModel.js carries the accent table with its `gnome`
#     member (Theme.qml exposes it; the theme-profile system owns it)
#   - scripts/panama-theme-apps maps the same names in shell
#   - the portal routes Settings to a backend that can serve accent-color
#
# Read-only apart from a gsettings *read*; it never sets an accent.

set -uo pipefail

repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
accents="$repo_dir/config/dot/quickshell/services/ThemeProfileModel.js"
script="$repo_dir/config/dot/quickshell/scripts/panama-theme-apps"
portals="$repo_dir/config/dot/xdg-desktop-portal/hyprland-portals.conf"

fail() {
    printf 'adwaita accent contract: %s\n' "$1" >&2
    exit 1
}

for path in "$accents" "$script" "$portals"; do
    [[ -r "$path" ]] || fail "missing $path"
done

# ── The accent table ─────────────────────────────────────────────────────────
mapping="$(python3 - "$accents" <<'PYTHON'
import re, sys
source = open(sys.argv[1]).read()
table = re.search(r"var CURATED = \{(.*?)\n\};", source, re.S)
if not table:
    raise SystemExit("curated accent table not found")
# Each accent is a multi-line record now, so the name opens a block and the
# member may be several lines below it.
for entry in re.finditer(r"\n    ([a-z]+): \{(.*?)\n    \}", table.group(1), re.S):
    member = re.search(r'gnome: "([a-z]+)"', entry.group(2))
    print(entry.group(1) + "\t" + (member.group(1) if member else ""))
PYTHON
)" || fail 'could not read the curated accent table from ThemeProfileModel.js'

[[ -n "$mapping" ]] || fail 'the accent table is empty'

while IFS=$'\t' read -r name member; do
    [[ -n "$name" ]] || continue
    [[ -n "$member" ]] \
        || fail "the \"$name\" accent has no gnome member, so libadwaita applications keep the previous accent when it is chosen"
done <<<"$mapping"

# ── Every member must exist in GNOME's enum ──────────────────────────────────
# The enum is read from the system rather than hardcoded here: a hardcoded copy
# would still pass on a machine whose GNOME dropped or renamed a member, which
# is the case where gsettings silently refuses the write.
if command -v gsettings >/dev/null 2>&1; then
    enum="$(gsettings range org.gnome.desktop.interface accent-color 2>/dev/null | tail -n +2 | tr -d "'")"
    if [[ -n "$enum" ]]; then
        while IFS=$'\t' read -r name member; do
            [[ -n "$member" ]] || continue
            grep -qx "$member" <<<"$enum" \
                || fail "the \"$name\" accent maps to \"$member\", which GNOME's accent-color enum does not publish"
        done <<<"$mapping"
    fi
fi

# ── The shell helper must agree with the table ───────────────────────────────
# panama-theme-apps carries its own copy of this mapping because a shell script
# cannot read a QML object. A copy that drifts is exactly how an accent ends up
# correct in Panama's own surfaces and wrong everywhere else.
shell_member() {
    local name="$1" body
    body="$(sed -n '/^gnome_accent() {/,/^}/p' "$script")"
    [[ -n "$body" ]] || fail 'gnome_accent() is missing from panama-theme-apps'
    local line
    line="$(grep -E "^\s+${name}\)" <<<"$body" | head -1)"
    if [[ -z "$line" ]]; then
        # Not listed means it falls through to the default branch.
        line="$(grep -E '^\s+\*\)' <<<"$body" | head -1)"
    fi
    sed -E "s/.*printf '([a-z]+)'.*/\1/" <<<"$line"
}

while IFS=$'\t' read -r name member; do
    [[ -n "$name" ]] || continue
    actual="$(shell_member "$name")"
    [[ "$actual" == "$member" ]] \
        || fail "Theme.qml maps \"$name\" to \"$member\" but panama-theme-apps maps it to \"$actual\""
done <<<"$mapping"

# The helper also validates the accent name it is handed; an accent the table
# knows but the helper rejects silently degrades to blue.
accepted="$(grep -oE '^\s+blue\|[a-z|]+\)' "$script" | head -1 | tr -d ' )' )"
while IFS=$'\t' read -r name member; do
    [[ -n "$name" ]] || continue
    grep -qE "(^|\|)$name(\||$)" <<<"$accepted" \
        || fail "panama-theme-apps does not accept the \"$name\" accent, so choosing it falls back to blue"
done <<<"$mapping"

# ── The portal has to be able to serve it ────────────────────────────────────
# xdg-desktop-portal-gtk cannot serve accent-color, so routing Settings to gtk
# alone makes every mapping above inert -- correct on paper, invisible in use.
settings_line="$(grep -E '^org\.freedesktop\.impl\.portal\.Settings=' "$portals")" \
    || fail 'the portal config does not route Settings at all, so accent-color has no backend'
[[ "$settings_line" == *gnome* ]] \
    || fail "Settings is routed to \"${settings_line#*=}\", and only the gnome backend serves accent-color"
[[ "${settings_line#*=}" == gnome* ]] \
    || fail "the gnome backend must come first in \"${settings_line#*=}\" or gtk answers Settings and accent-color is never published"

printf 'adwaita accent contract: PASS (%d accents mapped)\n' "$(grep -c . <<<"$mapping")"