#!/bin/bash
# plymouth.sh — Plymouth boot splash installer
#
# Installs the M-Archy Plymouth theme: skull logo centred on a dark background
# with a magenta spinning-dot animation below it.
#
# SVG NOTE: Plymouth's image loader (ply-image) is PNG-only — it links against
# libpng and has no SVG or gdk-pixbuf dependency.  The ply-image.h header is
# even commented "png file loader".  bg-skull.svg must be converted to PNG with
# rsvg-convert (higher fidelity than ImageMagick for SVG) before deployment.
#
# Logo resolution order (no user intervention required):
#   1. $DOTFILES_DIR/resources/bg-skull.svg  — repo copy, always present
#   2. /root/installer/resources/bg-skull.svg — archiso embedded copy
#
# Steps:
#   1. Install plymouth (extra repo)
#   2. Install librsvg (rsvg-convert) + imagemagick if absent
#   3. Convert bg-skull.svg → logo.png  (300 px wide)
#   4. Generate a 10×10 magenta dot.png for the spinner
#   5. Write the m-archy theme (.plymouth descriptor + .script animation)
#   6. Register with plymouth-set-default-theme
#   7. Inject plymouth / sd-plymouth hook into /etc/mkinitcpio.conf
#   8. Add 'quiet splash' to GRUB_CMDLINE_LINUX_DEFAULT
#   9. Regenerate GRUB config and initramfs

set -euo pipefail
source "$(dirname "${BASH_SOURCE[0]}")/../lib/logging.sh"

THEME_DIR="/usr/share/plymouth/themes/m-archy"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DOTFILES_DIR="$(cd "$SCRIPT_DIR/../../.." && pwd)"

# Resolve logo SVG — repo copy first, ISO embedded copy as fallback
LOGO_SVG=""
for _candidate in \
    "$DOTFILES_DIR/resources/bg-skull.svg" \
    "/root/installer/resources/bg-skull.svg"
do
    if [[ -f "$_candidate" ]]; then
        LOGO_SVG="$_candidate"
        break
    fi
done

# ── Install Plymouth ──────────────────────────────────────────────────────────
log "Installing Plymouth..."
sudo pacman -S --noconfirm --needed plymouth

# ── Ensure conversion tools ───────────────────────────────────────────────────
# Plymouth only loads PNG (libpng); rsvg-convert gives the best SVG→PNG output.
if ! command -v rsvg-convert &>/dev/null; then
    log "Installing librsvg (rsvg-convert) for SVG→PNG conversion..."
    sudo pacman -S --noconfirm --needed librsvg
fi
if ! command -v convert &>/dev/null; then
    log "Installing imagemagick (dot generation)..."
    sudo pacman -S --noconfirm --needed imagemagick
fi

# ── Convert logo SVG → PNG ────────────────────────────────────────────────────
TMP_LOGO="$(mktemp /tmp/plymouth-logo.XXXXXX.png)"
TMP_DOT="/tmp/plymouth-dot.png"
trap 'rm -f "$TMP_LOGO" "$TMP_DOT"' EXIT

if [[ -n "$LOGO_SVG" ]]; then
    log "Converting $LOGO_SVG → PNG (300 px wide)..."
    rsvg-convert -w 300 "$LOGO_SVG" -o "$TMP_LOGO"
else
    warn "bg-skull.svg not found in repo resources or ISO — using transparent placeholder."
    convert -size 300x300 xc:transparent "$TMP_LOGO"
fi

# ── Generate spinner dot ──────────────────────────────────────────────────────
# 10×10 magenta circle — centred at (5,5), radius 4 px
convert -size 10x10 xc:transparent \
    -fill '#E40046' \
    -draw 'circle 5,5 5,1' \
    "$TMP_DOT"

# ── Install theme files ───────────────────────────────────────────────────────
log "Installing M-Archy Plymouth theme..."
sudo mkdir -p "$THEME_DIR"
sudo cp "$TMP_LOGO" "$THEME_DIR/logo.png"
sudo cp "$TMP_DOT"  "$THEME_DIR/dot.png"

sudo tee "$THEME_DIR/m-archy.plymouth" > /dev/null <<'EOF'
[Plymouth Theme]
Name=M-Archy
Description=M-Archy boot splash — skull logo with spinning dots
ModuleName=script

[script]
ImageDir=/usr/share/plymouth/themes/m-archy
ScriptFile=/usr/share/plymouth/themes/m-archy/m-archy.script
EOF

sudo tee "$THEME_DIR/m-archy.script" > /dev/null <<'EOF'
# M-Archy Plymouth splash — skull logo + magenta spinner

Window.SetBackgroundTopColor    (0.10, 0.10, 0.10);
Window.SetBackgroundBottomColor (0.07, 0.07, 0.07);

screen_width  = Window.GetWidth ();
screen_height = Window.GetHeight ();

# Centred skull logo
logo.image  = Image ("logo.png");
logo.sprite = Sprite (logo.image);
logo.sprite.SetX (Math.Int (screen_width  / 2 - logo.image.GetWidth ()  / 2));
logo.sprite.SetY (Math.Int (screen_height / 2 - logo.image.GetHeight () / 2));
logo.sprite.SetZ (10);

# 12-dot spinner below the logo
num_dots  = 12;
dot_r     = 5;
orbit     = 35;
cx        = screen_width  / 2;
cy        = screen_height / 2 + logo.image.GetHeight () / 2 + 55;
dot.image = Image ("dot.png");

for (i = 0; i < num_dots; i++) {
    dot[i].sprite = Sprite (dot.image);
    dot[i].sprite.SetZ (20);
}

frame = 0;

fun refresh_callback () {
    frame++;
    step = 2 * Math.Pi / num_dots;
    for (i = 0; i < num_dots; i++) {
        angle = step * i + frame * 0.15;
        dot[i].sprite.SetX (Math.Int (cx + Math.Cos (angle) * orbit - dot_r));
        dot[i].sprite.SetY (Math.Int (cy + Math.Sin (angle) * orbit - dot_r));
        t = (i + Math.Int (frame / 4) % num_dots) % num_dots;
        f = t / num_dots;
        dot[i].sprite.SetOpacity (0.15 + 0.85 * f * f);
    }
}

Plymouth.SetRefreshFunction (refresh_callback);
EOF

# ── Register theme ────────────────────────────────────────────────────────────
log "Registering m-archy as default Plymouth theme..."
sudo plymouth-set-default-theme m-archy

# ── mkinitcpio: inject Plymouth hook ─────────────────────────────────────────
log "Adding Plymouth hook to /etc/mkinitcpio.conf..."
if grep -q '\bplymouth\b\|sd-plymouth' /etc/mkinitcpio.conf; then
    skip "Plymouth hook already present in mkinitcpio.conf"
else
    # systemd hook → sd-plymouth goes after systemd
    # traditional udev hook → plymouth goes after udev
    if grep -qE 'HOOKS=\([^)]*\bsystemd\b' /etc/mkinitcpio.conf; then
        sudo sed -Ei 's/(\bsystemd\b)( |\))/\1 sd-plymouth\2/' /etc/mkinitcpio.conf
        log "Injected sd-plymouth hook after systemd"
    else
        sudo sed -Ei 's/(\budev\b)( |\))/\1 plymouth\2/' /etc/mkinitcpio.conf
        log "Injected plymouth hook after udev"
    fi

    if ! grep -q '\bplymouth\b\|sd-plymouth' /etc/mkinitcpio.conf; then
        warn "Could not auto-inject Plymouth hook."
        warn "Manually add 'plymouth' after 'udev' in /etc/mkinitcpio.conf."
    fi
fi

# ── GRUB: add quiet splash ────────────────────────────────────────────────────
GRUB_CONF="/etc/default/grub"
if [[ -f "$GRUB_CONF" ]]; then
    if grep -q '\bsplash\b' "$GRUB_CONF"; then
        skip "'splash' already present in $GRUB_CONF"
    else
        log "Adding 'quiet splash' to GRUB_CMDLINE_LINUX_DEFAULT..."
        sudo sed -i 's/^GRUB_CMDLINE_LINUX_DEFAULT="\(.*\)"/GRUB_CMDLINE_LINUX_DEFAULT="\1 quiet splash"/' "$GRUB_CONF"
        sudo sed -i 's/quiet quiet/quiet/g' "$GRUB_CONF"
    fi
    log "Regenerating GRUB config..."
    sudo grub-mkconfig -o /boot/grub/grub.cfg
else
    warn "/etc/default/grub not found."
    warn "If using systemd-boot, add 'quiet splash' to your loader entry manually."
fi

# ── Rebuild initramfs ─────────────────────────────────────────────────────────
log "Rebuilding initramfs (this bakes the theme into the initrd)..."
sudo mkinitcpio -P

log "Plymouth m-archy theme installed. Reboot to see the splash screen."