#!/usr/bin/env bash

bm_version=0.4.0
# Emoji default database location
bm_db_location=${BEMOJI_DB_LOCATION:-"${XDG_DATA_HOME:-$HOME/.local/share}/bemoji"}
# Setting custom emoji list file location:
# BEMOJI_CUSTOM_LIST=/my/location/emojis.txt
# Setting custom recent emoji history:
# BEMOJI_HISTORY_LOCATION=/path/to/my/recents/directory
bm_state_dir="${BEMOJI_HISTORY_LOCATION:-${XDG_STATE_HOME:-$HOME/.local/state}}"
bm_history_file="${bm_state_dir}/bemoji-history.txt"

# Command to run after user chooses an emoji
bm_default_cmd="$BEMOJI_DEFAULT_CMD"

# Newline after echo
bm_echo_newline=${BEMOJI_ECHO_NEWLINE:-true}
# Do not save choices
bm_private_mode=${BEMOJI_PRIVATE_MODE:-false}
# Do not sort results
bm_limit_recent="$BEMOJI_LIMIT_RECENT"

declare -A default_pickers=(
	["bemenu"]="bemenu -p 🔍 -i -l 20"
	["wofi"]="wofi -p 🔍 -i --show dmenu"
	["rofi"]="rofi -p 🔍 -i -dmenu --kb-custom-1 "Alt+1" --kb-custom-2 "Alt+2""
	["dmenu"]="dmenu -p 🔍 -i -l 20"
	["ilia"]="ilia -n -p textlist -l 'Emoji' -i desktop-magnifier"
	["fuzzel"]="fuzzel -d -p 🔍"
)

# Report usage
usage() {
	echo "Usage: $(basename "$0") [-t | -c | -e] [-f <filepath> ] [-p] [-P] [-D <choices>]" 1>&2
	echo
	echo "A simple emoji picker. Runs on bemenu/wofi/rofi/dmenu by default."
	echo "Invoked without arguments sends the picked emoji to the clipboard."
	echo
	echo " Command options (can be combined):"
	echo "  -t, --type                 Simulate typing the emoji choice with the keyboard."
	echo "  -c, --clip                 Send emoji choice to the clipboard. (default)"
	echo "  -e, --echo                 Only echo out the picked emoji."
	echo ""
	echo " Other options:"
	echo "  -n, --noline               Do not print a newline after the picked emoji."
	echo "  -p, --private              Do not save picked emoji to recent history."
	echo "  -P, --hist-limit <number>  Limit number of recent emoji to display."
	echo "  -D, --download <choice>    Choose from default lists to download."
	echo "                             Valid choices: all|none|emoji|math|nerd (multiple choices possible)."
	echo "  -f, --file <filepath>      Use a custom emoji database. Can be a url which will be retrieved."
	echo "  -v, --version              Display current program version and directory configuration."
	echo "  -h, --help                 Show this help."
	echo
	exit "$1"
}

version() {
    printf "v%s\ndatabase=%s\nhistory=%s\n" "$bm_version" "$bm_db_location" "$bm_history_file"
    exit
}

msg() {
# Outputs a message to stderr, to be used for info, warning and error messages.
    printf "%s\n" "$1" >&2
}

parse_cli() {
	while getopts cD:ef:hnpP:tv-: arg "$@"; do
		case "$arg" in
		c) bm_cmds+=(_clipper) ;;
		D) _opt_set_download_list "${OPTARG}" ;;
		e) bm_cmds+=(cat) ;;
		f) _opt_set_custom_list "${OPTARG}" ;;
		h) usage 0 ;;
		n) bm_echo_newline=false ;;
		p) bm_private_mode=true ;;
		P) _opt_set_hist_limit "${OPTARG}" ;;
		t) bm_cmds+=(_typer) ;;
		v) version ;;
		-)
			LONG_OPTARG="${OPTARG#*=}"
			case "$OPTARG" in
			clip) bm_cmds+=(_clipper) ;;
			download=?*) _opt_set_download_list "${LONG_OPTARG}" ;;
			download*)
				_opt_set_download_list "${*:$OPTIND:1}"
				OPTIND=$((OPTIND + 1))
				;;
			echo) bm_cmds+=(cat) ;;
			file=?*) _opt_set_custom_list "${LONG_OPTARG}" ;;
			file*)
				_opt_set_custom_list "${*:$OPTIND:1}"
				OPTIND=$((OPTIND + 1))
				;;
			help) usage 0 ;;
			noline) bm_echo_newline=false ;;
			private) bm_private_mode=true ;;
			hist-limit=?*) _opt_set_hist_limit "${LONG_OPTARG}" ;;
			hist-limit*)
				_opt_set_hist_limit "${*:$OPTIND:1}"
				OPTIND=$((OPTIND + 1))
				;;
			type) bm_cmds+=(_typer) ;;
			version) version ;;
			'') break ;;
			*)
				echo "Unknown option: ${OPTARG}" 1>&2
				usage 1
				;;
			esac
			;;
		\?) exit 2 ;;
		esac
	done
	shift $((OPTIND - 1))
	OPTIND=1
}

_opt_set_custom_list() {
	BEMOJI_CUSTOM_LIST="$1"
}
_opt_set_download_list() {
	BEMOJI_DOWNLOAD_LIST="$1"
}
_opt_set_hist_limit() {
	bm_limit_recent="$1"
}

prepare_db() {
    # Create list directory
    if [ ! -d "$bm_db_location" ]; then
        mkdir -p "$bm_db_location"
    fi

    if [ -n "$BEMOJI_DOWNLOAD_LIST" ]; then
        # Populate default lists
        if echo "$BEMOJI_DOWNLOAD_LIST" | grep -q -e 'none'; then
            msg "Not downloading a default emoji list."
            return
        elif echo "$BEMOJI_DOWNLOAD_LIST" | grep -q -e 'all'; then
            dl_default_emoji
            dl_math_symbols
            dl_nerd_symbols
            return
        else
            if echo "$BEMOJI_DOWNLOAD_LIST" | grep -q -e 'emoji'; then
                dl_default_emoji
            fi
            if echo "$BEMOJI_DOWNLOAD_LIST" | grep -q -e 'math'; then
                dl_math_symbols
            fi
            if echo "$BEMOJI_DOWNLOAD_LIST" | grep -q -e 'nerd'; then
                dl_nerd_symbols
            fi
        fi
    fi
    if [ -n "$(find "$bm_db_location" -maxdepth 0 -type d -empty 2>/dev/null)" ]; then
        dl_default_emoji
    fi
}

dl_default_emoji() {
    local emojis
    emojis=$(curl -sSL "https://unicode.org/Public/emoji/latest/emoji-test.txt")
    printf "%s" "$emojis" | sed -ne 's/^.*; fully-qualified.*# \(\S*\) \S* \(.*$\)/\1 \2/gp' >"$bm_db_location/emojis.txt"
    msg "Downloaded default emoji set."
}
dl_math_symbols() {
    curl -sSL "https://unicode.org/Public/math/latest/MathClassEx-15.txt" |
        grep -ve '^#' | cut -d';' -f3,7 | sed -e 's/;/ /' >"$bm_db_location/math.txt"
    msg "Downloaded math symbols set."
}
dl_nerd_symbols() {
    local nerd all
    nerd=$(curl -sSL "https://raw.githubusercontent.com/ryanoasis/nerd-fonts/master/css/nerd-fonts-generated.css")
    all+=$(printf "%s" "$nerd" | sed -ne '/\.nf-/p' -e '/\s*[^_]content:/p' | sed -e 'N;s/^\.nf-\(.*\):before.* content: \"\\\(.*\)\";/\\U\2 \1/')
    echo -e "$all" > "$bm_db_location/nerdfont.txt"
    msg "Downloaded nerdfont symbols set."
}

gather_emojis() {
    if [ -n "$BEMOJI_CUSTOM_LIST" ] && [ -f "$BEMOJI_CUSTOM_LIST" ]; then
        result=$(cat "$BEMOJI_CUSTOM_LIST")
    elif [ -n "$BEMOJI_CUSTOM_LIST" ] && curl -fsSI "$BEMOJI_CUSTOM_LIST" >/dev/null 2>&1; then
        result=$(curl -sSL "$BEMOJI_CUSTOM_LIST")
    else
        result=$(cat "$bm_db_location"/*.txt)
    fi

    if [ -n "$bm_limit_recent" ] && [ "$bm_limit_recent" -eq 0 ]; then
        printf "%s" "$result"
        return
    fi

    printf "%s\n%s" "$(get_most_recent "$bm_limit_recent")" "$result" | cat -n - | sort -uk2 | sort -n | cut -f2-
}

get_most_recent() {
    limit=${1}
    recent_file="$bm_history_file"
    if [ ! -f "$recent_file" ]; then
        touch "$recent_file"
    fi
    # TODO improve this messy line
    local result
    result=$(sed -e '/^$/d' "$recent_file" |
        sort |
        uniq -c |
        sort -k1rn |
        sed -e 's/^\s*//' |
        cut -d' ' -f2-)
    if [ -z "$limit" ]; then
        echo "$result"
    else
        echo "$result" | head -n "$limit"
    fi
}

add_to_recent() {
    if [ -z "$1" ]; then return; fi
    if [ ! -d "$bm_state_dir" ]; then
        mkdir -p "$bm_state_dir"
    fi
    echo "$1" >>"$bm_history_file"
}

# Set default clipboard util
_clipper() {
    if [ -n "$BEMOJI_CLIP_CMD" ]; then
        # shellcheck disable=SC2068
        ${BEMOJI_CLIP_CMD[@]}
    elif [ -n "$WAYLAND_DISPLAY" ] && command -v wl-copy >/dev/null 2>&1; then
        wl-copy
    elif [ -n "$DISPLAY" ] && command -v xclip >/dev/null 2>&1; then
        xclip -selection clipboard
    elif [ -n "$DISPLAY" ] && command -v xsel >/dev/null 2>&1; then
        xsel -b
    else
        msg "No suitable clipboard tool found."
        exit 1
    fi
}

# Set default typing util
_typer() {
    if [ -n "$BEMOJI_TYPE_CMD" ]; then
        # shellcheck disable=SC2068
        ${BEMOJI_TYPE_CMD[@]}
        return
    fi

    totype=$(cat -)
    if [ -n "$WAYLAND_DISPLAY" ] && command -v wtype >/dev/null 2>&1; then
        wtype -s 30 "$totype"
    elif [ -n "$DISPLAY" ] && command -v xdotool >/dev/null 2>&1; then
        xdotool type --delay 30 "$totype"
    else
        msg "No suitable typing tool found."
        exit 1
    fi
}

# Set default picker util
_picker() {
    if [ -n "$BEMOJI_PICKER_CMD" ]; then
        # shellcheck disable=SC2068
        ${BEMOJI_PICKER_CMD[@]}
		return
	fi

	for tool in "${!default_pickers[@]}"; do
		if command -v "$tool" >/dev/null 2>&1; then
			${default_pickers[$tool]}
			return
		fi
	done

	msg "No suitable picker tool found."
	exit 1
}

parse_cli "$@"

[ -n "$BEMOJI_CUSTOM_LIST" ] || prepare_db
result=$(gather_emojis | _picker)
exit_value="$?"
[ "$bm_private_mode" = true ] || add_to_recent "$result"
result=$(echo "$result" | grep -o '^\S\+' | tr -d '\n')

case "$exit_value" in
1)
    exit 1
    ;;
0)
    if [ ${#bm_cmds[@]} -eq 0 ]; then
        if [ -n "$bm_default_cmd" ]; then
            # shellcheck disable=SC2068
            echo "$result" | ${bm_default_cmd[@]}
            exit
        fi
        bm_cmds+=(_clipper)
    fi
    for cmd in "${bm_cmds[@]}"; do
        [ "$bm_echo_newline" = true ] && echo_opts= || echo_opts=-n
        echo $echo_opts "$result" | "$cmd"
    done
    ;;
10)
    echo "$result" | _clipper
    ;;
11)
    echo "$result" | _typer
    ;;
esac
exit