#!/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 ───────────────────────────────
# The mapping used to be a second copy of this table, written out as a case
# statement in panama-theme-apps. It now lives in config/palette.json beside
# each accent's colours, and scripts/panama-palette reads it -- so the shell
# and QML resolve the same member from the same file rather than from two
# lists somebody has to remember to edit together.
#
# palette-contract checks palette.json against the QML table value by value;
# this checks that the shell actually resolves through it, which is the half
# that would let an accent be correct in Panama's own surfaces and wrong
# everywhere else.
helper="$repo_dir/config/dot/quickshell/scripts/panama-palette"
[[ -r "$helper" ]] || fail 'scripts/panama-palette is missing, so nothing maps accents for the shell'
grep -q 'accent_gnome()' "$helper" \
    || fail 'panama-palette does not resolve a GNOME accent member'
grep -q 'accent_gnome' "$script" \
    || fail 'panama-theme-apps no longer asks the palette for the GNOME accent member'
grep -q 'gnome_accent() {' "$script" \
    && fail 'panama-theme-apps has grown its own copy of the mapping again'

while IFS=$'\t' read -r name member; do
    [[ -n "$name" ]] || continue
    actual="$(bash -c "source '$helper'; accent_gnome '$name'")"
    [[ "$actual" == "$member" ]] \
        || fail "Theme.qml maps \"$name\" to \"$member\" but the shell resolves \"$actual\""
done <<<"$mapping"

# An accent the table knows but the palette does not would silently degrade to
# blue, which is the failure this pair of files exists to prevent.
palette="$repo_dir/config/dot/quickshell/config/palette.json"
while IFS=$'\t' read -r name member; do
    [[ -n "$name" ]] || continue
    jq -e --arg n "$name" '.accents | has($n)' "$palette" >/dev/null \
        || fail "the palette has no \"$name\" accent, so choosing it falls back to blue"
done <<<"$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")"