#!/usr/bin/env bash
# Launch the built Amiga example in FS-UAE. Defaults to PATTERN; pass
# "hello" to run HELLO instead.
#
# Kickstart and Workbench:
#   - If toolchains/emulators/support/kickstart.rom is present, it is
#     used as the Kickstart ROM. Otherwise FS-UAE's built-in AROS ROM
#     is used (less compatible with OCS Intuition but requires no
#     licensed files).
#   - If toolchains/emulators/support/workbench.adf is present, it is
#     inserted into DF0: and the Amiga boots Workbench. The user
#     launches the example from the JOEYLIB drawer on the desktop.
#   - If Workbench is not present, AmigaDOS boots directly from DH0:,
#     executes s/startup-sequence, and auto-runs the requested example.
#
# Always on A500 hardware (OCS chipset). Our HAL only uses OCS
# features so this matches real-hardware behavior.
#
#   scripts/run-amiga.sh           # runs Pattern
#   scripts/run-amiga.sh hello     # runs Hello

set -euo pipefail

prog=${1:-pattern}
repo=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
bin_dir=$repo/build/amiga/bin
support=$repo/toolchains/emulators/support

case $prog in
    hello)   file=Hello ;;
    pattern) file=Pattern ;;
    *) echo "usage: $0 [hello|pattern]" >&2; exit 2 ;;
esac

if [[ ! -f "$bin_dir/$file" ]]; then
    echo "$bin_dir/$file not built. Run 'make amiga' first." >&2
    exit 1
fi

kickstart=$support/kickstart.rom
workbench=$support/workbench.adf

# Stage a fresh hard-drive directory containing both example binaries
# plus an s/startup-sequence that auto-invokes the chosen one. The
# startup-sequence only runs when booting directly from the hard
# drive (i.e. no Workbench floppy); Workbench takes over boot if
# present and the user launches manually.
work=$(mktemp -d -t joeylib-amiga.XXXXXX)
# Preserve any diagnostic dumps Pattern writes to the virtual HD
# (copper.txt, etc.) before the temp dir is removed on script exit.
dump_keep=/tmp/joeylib-amiga-dump
trap 'mkdir -p "$dump_keep"; cp "$work"/*.txt "$dump_keep"/ 2>/dev/null; rm -rf "$work"' EXIT

mkdir -p "$work/s"
cp "$bin_dir/Hello"   "$work/" 2>/dev/null || true
cp "$bin_dir/Pattern" "$work/" 2>/dev/null || true
# ':' prefix anchors to the root of the current volume; otherwise
# AmigaDOS looks in C: and the command is not found.
echo ":$file" > "$work/s/startup-sequence"

fsargs=(
    --amiga_model=A500
    --fast_memory=2048
    --hard_drive_0="$work"
    --hard_drive_0_label=JOEYLIB
    # Mouse-handling overrides for VM hosts where FS-UAE's default
    # relative-mode grab fights with the hypervisor's own pointer
    # integration. automatic_input_grab=0 stops FS-UAE from grabbing
    # the pointer on focus; middle_click_ungrab=1 is a fallback so a
    # middle-click releases any grab that does occur; mouse_integration=1
    # asks FS-UAE to track host pointer position directly instead of
    # sampling relative deltas.
    --automatic_input_grab=0
    --middle_click_ungrab=1
    --mouse_integration=1
    # Speed overrides: floppy_drive_speed=800 runs the floppy at 8x so
    # the Workbench boot finishes in a few seconds instead of a minute.
    # accuracy=0 and fast_copper=1 are deliberately NOT set -- they
    # compromise copper timing, which our per-scanline palette swaps
    # depend on.
    --floppy_drive_speed=800
)

if [[ -f $kickstart ]]; then
    fsargs+=(--kickstart_file="$kickstart")
fi

if [[ -f $workbench ]]; then
    fsargs+=(--floppy_drive_0="$workbench")
    cat <<EOF
FS-UAE booting Workbench from DF0:. Once the desktop appears:
  1. Double-click the JOEYLIB disk icon.
  2. From the Window menu, pick "Show > All Files" (Workbench hides
     files that have no .info icon by default).
  3. Double-click $file to run it.
Alternatively open a Shell (Workbench > Tools > Shell), type 'cd
JOEYLIB:' then '$file'.
EOF
else
    cat <<EOF
FS-UAE booting directly from the JOEYLIB hard drive. $file will
auto-run via s/startup-sequence. Drop a Workbench 3.1 ADF at
$workbench to boot the GUI instead.
EOF
fi

# Intentionally no exec: we need the bash EXIT trap to fire so the
# scratch dir gets cleaned up (and any diagnostic dumps preserved).
# exec would replace the shell and skip trap execution.
fs-uae "${fsargs[@]}"