#!/usr/bin/env bash

gitignore_io_url="https://www.toptal.com/developers/gitignore/api/"
default_path="$HOME/.gi_list"
if [[ -n "$XDG_CACHE_HOME" ]]; then
  default_path="$XDG_CACHE_HOME/git-extras/gi_list"
  mkdir -p "$XDG_CACHE_HOME/git-extras"
fi

update_gi_list() {
    curl -L -s  "${gitignore_io_url}/list" > "$default_path"
}

print_in_alphabetical_order() {
    local first_character previous_first_character ignorable
    local first=true
    for ignorable in $(echo "$gi_list" | sort);
    do
        first_character=${ignorable:0:1}
        if [[ $first_character = "$previous_first_character" ]]; then
            printf " %s" "$ignorable"
        elif [[ $first = true ]]; then
            previous_first_character=$first_character
            first=false
            printf "%s" "$ignorable"
        else
            previous_first_character=$first_character
            printf "\n%s" "$ignorable"
        fi
    done
    echo
}

print_in_table_format() {
    echo "$gi_list" | column
}

search() {
    for type in $gi_list;
    do
        if [[ "$type" == *$1* ]]
        then
            echo "$type"
        fi
    done
}

print_last_modified_time() {
    if ! gi_list_date=$(stat -c "%y" "$default_path" 2> /dev/null); then
        if ! gi_list_date=$(stat -f "%t%Sm" "$default_path" 2> /dev/null); then
            if ! gi_list_date=$(date -r "$default_path" +%s 2> /dev/null); then
                gi_list_date=0
            fi
        fi
    fi
    echo "Last update time: $gi_list_date"
}

gi() {
    curl -L -s $gitignore_io_url/"$1"
}

gi_replace() {
    gi "$1" > .gitignore
}

gi_append() {
    gi "$1" >> .gitignore
}

show_usage() {
    echo "Usage:"
    echo "  git ignore-io <types>...                    Show gitignore template"
    echo "                [-a|--append] <types>...      Append new .gitignore content to .gitignore under the current directory"
    echo "                [-r|--replace] <types>...      Export new .gitignore to the current directory (The old one will be replaced)"
    echo "                [-l|--list-in-table]          Print available types in table format"
    echo "                [-L|--list-alphabetically]    Print available types in alphabetical order    "
    echo "                [-s|--search] <word>          Search word in available types"
    echo "                [-t|--show-update-time]       Show the last modified time of $default_path (where the list of available types is stored)"
    echo "                [-u|--update-list]            Update $default_path"
}


check_list_exist() {
    if ! [ -f "$default_path" ]; then
        echo "-----Initial gitignore.io list----"
        update_gi_list
        echo "-----Save to $default_path-----"
        echo
    fi
    gi_list=$(tr "," "\n" < "$default_path" 2>/dev/null)
}

check_list_exist
if [[ $# -eq 0 ]]; then
    show_usage
else
    case $1 in
        -a|--append|-r|--replace)
            opt=$1
            shift
            if [[ $# -eq 0 ]]; then
                echo "There should be at least one type"
                echo
                show_usage
                exit
            fi

            gi_to_curl=$(echo "$@" | tr " " ",")
            case $opt in
            -a|--append)
                gi_append "$gi_to_curl"
                ;;
            -r|--replace)
                gi_replace "$gi_to_curl"
                ;;
            esac

            exit
            ;;
        -t|--show-update-time)
            print_last_modified_time
            ;;
        -u|--update-list)
            update_gi_list
            ;;
        -s|--search)
            opt=$1
            shift
            if [[ $# -eq 0 ]]; then
                show_usage
                exit
            fi
            search "$1"
            ;;
        -L|--list-alphabetically)
            print_in_alphabetical_order
            ;;
        -l|--list-in-table)
            print_in_table_format
            ;;
        -*)
            echo No Such option
            show_usage
            ;;
        *)
            gi_to_curl=$(echo "$@" | tr " " ",")
            gi "$gi_to_curl"
            ;;
    esac
fi