#!/bin/sh
# SPDX-License-Identifier: GPL-2.0-or-later

REPORT="libcamera-report-$(hostname)-$(date +%Y%m%d-%H%M%S).txt"

section() {
    echo
    echo "=================================================="
    echo "$1"
    echo "=================================================="
}

run() {
    echo
    echo "\$ $*"
    "$@" || echo "[WARN] Command failed: $*"
}

# Run a command with sudo if the script was allowed to use it.
run_with_sudo() {
    if [ -n "$SUDO" ]; then
        echo
        echo "\$ $SUDO $*"
        $SUDO "$@" || echo "[WARN] Command failed: $SUDO $*"
    else
        run "$@"
    fi
}

mark_kmsg() {
    if [ -w /dev/kmsg ]; then
        echo "libcamera-bug-report[$$]: $1" > /dev/kmsg
    elif [ -n "$SUDO" ]; then
        printf "libcamera-bug-report[%s]: %s\n" "$$" "$1" | $SUDO tee /dev/kmsg >/dev/null || \
            echo "[WARN] failed to write /dev/kmsg with sudo: $1"
    else
        echo "[INFO] /dev/kmsg not writable, skipping kernel marker: $1"
    fi
}

main() {

    section "Report metadata"
    echo "Date: $(date -Is)"
    echo "Host: $(hostname)"
    echo "User: $(id)"

    section "Kernel & OS"
    run uname -a
    run cat /etc/os-release
    command -v lsb_release >/dev/null && run lsb_release -a

    section "Media / V4L2 tools"
    command -v media-ctl >/dev/null && run media-ctl --version
    command -v v4l2-ctl >/dev/null && run v4l2-ctl --version
    command -v v4l2-ctl >/dev/null && run v4l2-ctl --list-devices

    section "Device nodes"
    run ls -l /dev/video* /dev/v4l-* /dev/media* 2>/dev/null
    run grep . /sys/class/video4linux/*/name

    section "Deferred devices"
    run_with_sudo cat /sys/kernel/debug/devices_deferred

    section "V4L2 async pending subdevices"
    run_with_sudo cat /sys/kernel/debug/v4l2-async/pending_async_subdevices

    section "Media graph topology"
    for m in /dev/media*; do
        echo
        echo "Parsing $m"
        command -v media-ctl >/dev/null && run media-ctl -p -d "$m"
    done

    section "libcamera & userspace"
    run which cam
    command -v cam >/dev/null && run ldd "$(which cam)"

    section "libcamera probe (cam -l)"
    mark_kmsg "BEGIN cam -l"
    LIBCAMERA_LOG_LEVELS="*:0" run cam -l
    mark_kmsg "END cam -l"

    section "Kernel log (post cam -l)"
    run_with_sudo dmesg

    section "Permissions & capabilities"
    run id
    run groups
    command -v getcap >/dev/null && run getcap "$(which cam)"

    section "End of report"

}

# If not running as root, prompt the user once to allow sudo
SUDO=""
if [ "$(id -u)" -ne 0 ]; then
    if [ -t 0 ]; then
        printf "Some checks require root; allow sudo for privileged commands? [y/N] "
        read -r ans
        case "$ans" in
            [Yy]|[Yy][Ee][Ss]) SUDO="sudo" ;;
            *) SUDO="" ;;
        esac
    fi
fi

# Run main and tee output to both stdout and the report file.
main 2>&1 | tee "$REPORT"

echo ""
echo "Report saved to $REPORT"
echo "Please inspect the report and remove any sensitive information before sharing."