#!/usr/bin/env bash
# Capture an area, active monitor, or all monitors and edit in Satty.
set -euo pipefail
umask 077

fail() {
    echo "ferese-screenshot: $*" >&2
    if command -v notify-send >/dev/null; then
        notify-send --app-name=Ferese --urgency=critical 'Screenshot failed' "$*" || true
    fi
    exit 1
}

mode=area
case ${1:-} in
    '') ;;
    --full) mode=full; shift ;;
    --all) mode=all; shift ;;
    --help|-h)
        echo 'Usage: ferese-screenshot [--full | --all]'
        echo 'Select an area; --full captures the active monitor; --all captures all monitors.'
        exit 0
        ;;
    *) fail 'Usage: ferese-screenshot [--full | --all]' ;;
esac
(($# == 0)) || fail 'Usage: ferese-screenshot [--full | --all]'

for tool in feresectl satty wl-copy flock python3; do
    command -v "$tool" >/dev/null || fail "Required command not found: $tool"
done
: "${XDG_RUNTIME_DIR:?A Wayland login session is required}"
exec 9>"$XDG_RUNTIME_DIR/ferese-screenshot.lock"
flock -n 9 || exit 0

capture_args=()
if [[ $mode == area ]]; then
    command -v slurp >/dev/null || fail 'Required command not found: slurp'
    # Escape cancels without creating a file or changing the clipboard.
    geometry=$(slurp) || exit 0
    [[ -n $geometry ]] || exit 0
    capture_args=(-g "$geometry")
elif [[ $mode == full ]]; then
    # Resolve the active monitor before Satty can change keyboard focus.
    # Never fall back to an all-monitor capture when IPC is unavailable.
    # This is the only mode that needs the output list; the editor is sized
    # from the captured image instead.
    geometry=$(feresectl get-outputs | python3 -c '
import json, sys
outputs = [output for output in json.load(sys.stdin) if output.get("enabled")]
focused = [output for output in outputs if output.get("focused")]
selected = focused if len(focused) == 1 else outputs if len(outputs) == 1 else []
if len(selected) != 1 or any(selected[0].get(k) is None for k in ("x", "y", "width", "height")):
    sys.exit(1)
print("%d,%d %dx%d" % (selected[0]["x"], selected[0]["y"], selected[0]["width"], selected[0]["height"]))
') || fail 'Could not determine the active monitor. Use area selection or --all.'
    capture_args=(-g "$geometry")
fi
pictures=$(xdg-user-dir PICTURES 2>/dev/null) || pictures="$HOME/Pictures"
directory=${pictures:-$HOME/Pictures}/Screenshots
mkdir -p -- "$directory" || fail 'Could not create the screenshot directory.'
file=$(mktemp "$directory/Screenshot-$(date +%Y-%m-%d_%H-%M-%S)-XXXXXX.png") || fail 'Could not create the screenshot file.'
input=''
capture_error=''
trap '[[ -z $input ]] || rm -f -- "$input"; [[ -z $capture_error ]] || rm -f -- "$capture_error"; [[ -s $file ]] || rm -f -- "$file"' EXIT
input=$(mktemp "$XDG_RUNTIME_DIR/ferese-screenshot-XXXXXX.png") || fail 'Could not create the temporary capture.'
capture_error=$(mktemp "$XDG_RUNTIME_DIR/ferese-screenshot-error-XXXXXX") || fail 'Could not create the capture log.'
if ! feresectl screenshot "${capture_args[@]}" >"$input" 2>"$capture_error"; then
    detail=$(<"$capture_error")
    fail "Could not capture the screen. ${detail:-The compositor returned no error details.}"
fi
# Size the editor to the image that was actually captured, so a small area
# selection does not open a huge window and a multi-monitor --all capture is not
# sized from whichever output happened to be focused. Satty treats this as a
# default size, and Ferese floats the window at whatever it commits.
editor_size=$(python3 -c '
import sys

header = open(sys.argv[1], "rb").read(24)
if header[:8] != b"\x89PNG\r\n\x1a\n" or header[12:16] != b"IHDR":
    sys.exit(1)
width = int.from_bytes(header[16:20], "big")
height = int.from_bytes(header[20:24], "big")
if width <= 0 or height <= 0:
    sys.exit(1)

MAX_W, MAX_H = 1500, 920
MIN_W, MIN_H = 480, 360
factor = min(MAX_W / width, MAX_H / height, 2.0)
target_w = max(MIN_W, round(width * factor))
target_h = max(MIN_H, round(height * factor))
# The minimums can push past the maximums for extreme aspect ratios.
shrink = min(MAX_W / target_w, MAX_H / target_h, 1.0)
print("%dx%d" % (max(1, round(target_w * shrink)), max(1, round(target_h * shrink))))
' "$input") || editor_size=1000x700
# Enter saves the annotated image and copies it; Escape discards the capture.
# Keep the parent lock through editing. Close it only in Satty so clipboard
# helpers cannot inherit the lock and keep later screenshots blocked.
satty --filename "$input" --output-filename "$file" \
    --app-id dev.ferese.Screenshot \
    --resize "$editor_size" \
    --no-window-decoration \
    --copy-command 'wl-copy --type image/png' \
    --save-after-copy \
    --actions-on-enter save-to-file,save-to-clipboard,exit \
    --actions-on-escape exit 9>&- || fail 'Could not open the screenshot in Satty.'
if [[ -s $file ]]; then
    printf '%s\n' "$file"
fi