#!/bin/bash

isnum() {
    grep -xq '[0-9]\+' <<<"$1"
}

scorefile() {
    if [ "${1##*.}" = mkv ]; then
	echo 10
    elif [ "${1##*.}" = ogm ]; then
	echo 5
    else
	echo 0
    fi
}

findbase() {
    if [ -r aliases ]; then
	while read alias rest; do
	    if [ "$alias" = "$1" ]; then
		echo "$rest"
		return
	    fi
	done <aliases
    fi
    echo "$1"
}

findfile() {
    if [ -n "$debug" ]; then echo "finding base='$1', ep='$2', qual='$3'" >&2; fi
    local base file tail eq eqt m matches max score
    matches=()
    base="$(findbase "$1")"
    for file in "$base"*; do
	tail="${file#"$base"}"
	eq="${tail%.*}"
	m=n
	if [ "${eq%% *}" -eq "$2" ] 2>/dev/null; then
	    if [[ "$eq" == *\ * ]]; then
		eqt="${eq#* }"
	    else
		eqt=
	    fi
	    m=y
	elif [ "${eq:0:${#2}}" = "$2" ]; then
	    eqt="${eq:${#2}}"
	    if [ "${eqt:0:1}" = " " -o -z "$eqt" ]; then
		eqt="${eqt# }"
		m=y
	    fi
	fi
	if [ "$m" = y ]; then
	    if [ "$eqt" = "$3" -o "$eqt" = "($3)" -o "${eqt:0:2}" = "- " ]; then
		matches=("${matches[@]}" "$file")
	    fi
	fi
    done
    if [ ${#matches[@]} -lt 1 ]; then return 1; fi
    max=
    for m in "${matches[@]}"; do
	score="$(scorefile "$m")"
	if [ -n "$debug" ]; then echo "found \`$m': score $score" >&2; fi
	if [ -z "$max" ] || [ "$score" -gt "$max" ]; then
	    max="$score"
	    file="$m"
	fi
    done
    if [ -n "$debug" ]; then echo "using \`$file'" >&2; fi
    echo "$file"
    return 0
}

origargs=("$0" "$@")
cmdline=(mpv -fs)
debug=
log=y
unset pretend printfile

while [ "${1:0:1}" = - ]; do
    a="$1"
    shift
    case "$a" in
	-h)
	    echo "usage: planime [-fdhtCL] [-A PLAYER-ARGS... ;] [-s PAR VAL] [--] [NAME-QUAL] [EP|.] [TYPE-QUAL]" >&2
	    exit 0
	    ;;
	-d)
	    debug=y
	    ;;
	-t)
	    cmdline=("${cmdline[@]}" -audio-device 'alsa/hdmi:CARD=PCH,DEV=0')
	    DISPLAY=:1
	    chwp=y
	    ;;
	-C)
	    pretend=y
	    ;;
	-L)
	    log=
	    ;;
	-A)
	    while :; do
		if [ $# -lt 1 ]; then
		    echo "planime: unterminated argument list" >&2
		    exit 1
		fi
		a="$1"
		shift
		if [ "$a" = \; ]; then
		    break;
		fi
		cmdline=("${cmdline[@]}" "$a")
	    done
	    ;;
	-s)
	    savepar="$1"
	    shift
	    saveval="$1"
	    shift
	    ;;
	-f)
	    printfile=y
	    ;;
	-v)
	    cmdline=("${cmdline[@]}" -v)
	    ;;
	--)
	    break
	    ;;
	*)
	    echo "planime: unknown option \`$a'"
	    exit 1
	    ;;
    esac
done

dirbase="$(basename "$(pwd)")"
base=.
nextep=n
file=
tqual=
if [ $# -eq 0 ]; then
    nextep=y
elif [ $# -eq 1 ]; then
    if [ -r "$1" ]; then
	file="$1"
    else
	base=
	ep="$1"
    fi
elif [ $# -eq 2 ]; then
    if findfile "$dirbase - " "$1" "$2" >/dev/null; then
	base=""
	ep="$1"
	tqual="$2"
    else
	base="$1"
	ep="$2"
    fi
else
    base="$1"
    ep="$2"
    tqual="$3"
fi
if [ "$ep" = . ]; then nextep=y; fi
if [ "$nextep" = y -a -r nextep ]; then
    ep="$(<nextep)"
    if ! isnum "$ep"; then
	echo "planime: nextep is non-numeric" >&2
	exit 1
    fi
fi
if [ -z "$file" ]; then
    if [ "$base" = . ]; then
	if [ -r curser ]; then
	    curser="$(<curser)"
	else
	    curser=
	fi
    else
	curser="$(findbase "$base")"
    fi
    if [ -n "$curser" ]; then
	file="$(findfile "$dirbase $curser - " "$ep" "$tqual")" || \
	    file="$(findfile "$curser - " "$ep" "$tqual")"
    else
	file="$(findfile "$dirbase - " "$ep" "$tqual")"
    fi
fi

if [ -z "$file" -o ! -r "$file" ]; then
    echo "planime: no matching file found" >&2
    exit 1
fi

case "${file##*.}" in
    ogm)
	aid=1
	sid=0
	;;
    mkv)
	alang=jpn
	slang=eng
	;;
esac

ifile=".${file}.info"

if [ -n "$savepar" ]; then
    if [ -r "$ifile" ]; then
	egrep -v "^${savepar} " "$ifile" >"$ifile.new"
	mv -f "$ifile.new" "$ifile"
    fi
    echo "$savepar $saveval" >>"$ifile"
    exit 0
fi

unset delay

if [ -r "$ifile" ]; then
    exec 3<&0
    exec 0<"$ifile"
    while read par arg; do
	if [ "$par" = delay ]; then
	    cmdline=("${cmdline[@]}" -delay "$arg")
	elif [ "$par" = aspect ]; then
	    cmdline=("${cmdline[@]}" -aspect "$arg")
	elif [ "$par" = volmod ]; then
	    cmdline=("${cmdline[@]}" -af volume="$arg")
	elif [ "$par" = alang ]; then
	    unset alang aid
	    alang="$arg"
	elif [ "$par" = aid ]; then
	    unset alang aid
	    aid="$arg"
	elif [ "$par" = slang ]; then
	    unset slang sid
	    slang="$arg"
	elif [ "$par" = sid ]; then
	    unset slang sid
	    sid="$arg"
	fi
    done
    exec 0<&3
    exec 3<&-
fi

if [ -n "$alang" ]; then
    cmdline=("${cmdline[@]}" -alang "$alang")
elif [ -n "$aid" ]; then
    cmdline=("${cmdline[@]}" -aid "$((aid + 1))")
fi
if [ -n "$slang" ]; then
    cmdline=("${cmdline[@]}" -slang "$slang")
elif [ -n "$sid" ]; then
    cmdline=("${cmdline[@]}" -sid "$((sid + 1))")
fi

if [ -n "$pretend" ]; then
    echo "${cmdline[@]}" "$file"
elif [ -n "$printfile" ]; then
    echo "$file"
else
    if [ "$chwp" = y ]; then (sleep 2; randomwp) & fi
    if [ "$log" = y ]; then
	if [ -d $HOME/.anime ]; then
	    echo "$(date) $(basename "$file")" >>$HOME/.anime/plog
	fi
    fi
    "${cmdline[@]}" "$file"
    
    if [ "$nextep" = y ]; then
	echo "0. Save and continue (or Space)"
	echo "1. Continue without saving"
	echo "2. Save and exit (or Enter)"
	echo "3. Exit without saving (or any key)"
	IFS= read -sn1 c
	save=n
	cont=n
	case "$c" in
	    0|" ")
		save=y
		cont=y
		;;
	    1)
		cont=y
		;;
	    2|"")
		save=y
		;;
	esac
	if [ "$save" = y ]; then
	    let ep++
	    echo "$ep" >nextep
	fi
	if [ "$cont" = y ]; then
	    exec "${origargs[@]}"
	else
	    echo "nextep is $ep"
	fi
    fi
fi