# Nix supplies the whole toolchain (Zig, GTK, libadwaita), so there is
# nothing for mise to install; these tasks just drive it.

[tasks.build]
description = "Build a release binary into zig-out/bin"
run = "nix develop --command zig build -Doptimize=ReleaseFast"

[tasks.build-debug]
description = "Build a debug binary (leak checking, safety checks)"
run = "nix develop --command zig build"

[tasks.run]
description = "Build and run vtabs"
run = "nix develop --command zig build run"

[tasks.fmt]
description = "Format all Zig source"
run = "nix develop --command zig fmt build.zig src"

[tasks.screenshot]
description = "Screenshot vtabs in a throwaway headless compositor"
depends = ["build-debug"]
run = "nix develop --command ./shot.sh"

[tasks.install]
description = "Install vtabs into ~/.local with a desktop entry and icon"
depends = ["build"]
run = '''
#!/usr/bin/env bash
set -euo pipefail

data="${XDG_DATA_HOME:-$HOME/.local/share}"
bindir="$HOME/.local/bin"
libexec="$HOME/.local/libexec/vtabs"
apps="$data/applications"
icons="$data/icons/hicolor/scalable/apps"
gcroots="$data/vtabs/gcroots"

# The binary carries an RPATH into the Nix store, so it runs anywhere, but it
# still has to be told where GTK's GSettings schemas and icon themes live or
# it aborts on a missing schema. Read those paths back out of the dev shell
# that built it rather than hardcoding store hashes.
schemas="$(nix develop --command printenv VTABS_GSETTINGS_SCHEMA_DIR)"
datadirs="$(nix develop --command printenv VTABS_RUNTIME_DATA_DIRS)"

mkdir -p "$bindir" "$libexec" "$apps" "$icons" "$gcroots"

install -m755 zig-out/bin/vtabs "$libexec/vtabs"

# A launcher script rather than a symlink: a desktop launcher starts the app
# with a minimal environment, so the GTK runtime paths must be set here.
# Existing values are preserved so this composes with the rest of the session.
cat > "$bindir/vtabs" <<EOF
#!/bin/sh
# Generated by \`mise run install\` — re-run that instead of editing.
export GSETTINGS_SCHEMA_DIR="$schemas\${GSETTINGS_SCHEMA_DIR:+:\$GSETTINGS_SCHEMA_DIR}"
export XDG_DATA_DIRS="$datadirs:\${XDG_DATA_DIRS:-/usr/local/share:/usr/share}"
exec "$libexec/vtabs" "\$@"
EOF
chmod 755 "$bindir/vtabs"

sed "s|@EXEC@|$bindir/vtabs|" dist/dev.greyson.vtabs.desktop.in \
  > "$apps/dev.greyson.vtabs.desktop"
install -m644 dist/dev.greyson.vtabs.svg "$icons/dev.greyson.vtabs.svg"

# Pin the store paths the installed binary links against. Without this a
# later `nix-collect-garbage` deletes GTK and the installed app stops
# starting, with no obvious connection to the command that broke it.
# Nix roots are transitive, so rooting each RPATH entry covers its closure.
rm -f "$gcroots"/*
if command -v readelf >/dev/null; then
  readelf -d "$libexec/vtabs" \
    | sed -n 's/.*R\(UN\)\?PATH.*\[\(.*\)\]/\2/p' \
    | tr ':' '\n' \
    | sed -n 's|^\(/nix/store/[^/]*\).*|\1|p' \
    | sort -u \
    | while read -r path; do
        nix-store --realise --add-root "$gcroots/$(basename "$path")" \
          --indirect "$path" >/dev/null 2>&1 || true
      done
  echo "pinned $(find "$gcroots" -maxdepth 1 -type l | wc -l) store paths against garbage collection"
else
  echo "warning: readelf not found; store paths left unpinned (nix-collect-garbage may break the install)" >&2
fi

# Let the desktop notice the new entry and icon right away.
command -v update-desktop-database >/dev/null && update-desktop-database -q "$apps" || true
command -v gtk-update-icon-cache   >/dev/null && gtk-update-icon-cache -qtf "$data/icons/hicolor" 2>/dev/null || true

echo "installed $bindir/vtabs"
case ":$PATH:" in
  *":$bindir:"*) ;;
  *) echo "note: $bindir is not on your PATH; the desktop entry still works" >&2 ;;
esac
'''

[tasks.uninstall]
description = "Remove everything `install` put into ~/.local"
run = '''
#!/usr/bin/env bash
set -euo pipefail

data="${XDG_DATA_HOME:-$HOME/.local/share}"
apps="$data/applications"

rm -f "$HOME/.local/bin/vtabs"
rm -rf "$HOME/.local/libexec/vtabs"
rm -f "$apps/dev.greyson.vtabs.desktop"
rm -f "$data/icons/hicolor/scalable/apps/dev.greyson.vtabs.svg"
# Dropping the roots lets Nix reclaim the runtime closure on its next GC.
rm -rf "$data/vtabs"

command -v update-desktop-database >/dev/null && update-desktop-database -q "$apps" || true
command -v gtk-update-icon-cache   >/dev/null && gtk-update-icon-cache -qtf "$data/icons/hicolor" 2>/dev/null || true

echo "uninstalled vtabs"
'''