#!/usr/bin/env bash

#
#  Darkcloud Vim Config Update Tool
#  https://github.com/prurigro/darkcloud-vimconfig
#
#  Written by Kevin MacMartin (prurigro@gmail.com)
#  Released under the MIT license
#

script_name="${0//*\/}"
script_home="${0%$script_name}"

if [[ -z "$script_home" ]]; then
    script_home="$PWD"
else
    pushd "$script_home" >/dev/null
    script_home="$PWD"
    popd >/dev/null
fi

repo_version="$(printf "%s.r%s" "$(git show -s --format=%ci master | sed 's/\ .*//g;s/-//g')" "$(git rev-list --count HEAD)")"
error_log='update-errors.log'

[[ -t 1 ]] && {
    cbg_blue=$'\e[44m'
    cbg_red_bold=$'\e[1;41m'
    cbg_black=$'\e[40m'
    cbg_yellow=$'\e[43m'
    cfg_green_bold=$'\e[1;32m'
    cfg_red_bold=$'\e[1;31m'
    cfg_white_bold=$'\e[1;37m'
    c_reset=$'\e[0m'
} || \
    cbg_blue='#'

# error: output and log error
function error {
    printf '%s\n' "$cbg_blue $c_reset$cbg_red_bold ! ERROR: $c_reset$cfg_red_bold $2 " >&2
    printf '%s\n' "$cbg_blue $c_reset$cbg_red_bold ! COMMAND: $c_reset ${cfg_white_bold}=> $1$c_reset" >&2

    [[ -n "$3" ]] \
        && printf '%s\n' "$cbg_blue $c_reset$cbg_red_bold ! OUTPUT: $c_reset$cfg_white_bold $3" >&2

    printf '%s\n%s\n%s\n' "DATE: @ $(date)" "ERROR: $2" "COMMAND: $1" >> "$script_home/$error_log"

    [[ -n "$3" ]] \
        && printf '%s\n' "OUTPUT: $3" >> "$script_home/$error_log"

    printf '\n' >> "$script_home/$error_log"
}

# show_version: displays version information
function show_version {
    printf '%s\n' "$script_name: darkcloud-vimconfig update tool (version: $repo_version)"
}

# show_help: this function displays help output
function show_help {
    printf '\n%s\n' 'USAGE'
    printf '  %s\n\n' "./$script_name [OPTION]"
    printf '%s\n' 'OPTIONS'
    printf '  %s\t%s\n' '-v, --version' '| output version information and exit'
    printf '  %s\t%s\n\n' '-h, --help' '| display this help and exit'
    printf '%s\n' 'Run with no arguments to update darkcloud-vimconfig'
}

### SETUP
if type -P timeout >/dev/null; then
    timeout_command=timeout
elif type -P gtimeout >/dev/null; then
    timeout_command=gtimeout
else
    error 'type -P timeout' 'The timeout command could not be found (install coreutils)'
    exit 1
fi

cd "$script_home" || exit

# delete old error log if it exists
[[ -f "$error_log" ]] \
    && rm "$script_home/$error_log"

# parse for arguments (then handle them below)
[[ -n "$1" ]] && {
    case "$1" in
        -h|--help)
            show_version
            show_help
            exit 0
            ;;
        -v|--version)
            show_version
            exit 0
            ;;
        *)
            error "$ERROR" "$1 is not a valid option"
            show_help
            exit 1
            ;;
    esac
}

# display script title
printf '\n%s\n' "$cbg_black ~~~ DarkCloud Vimconfig Update Tool ~~~ $c_reset"

# create vim/bundle.user if it doesn't exist
[[ -d 'vim/bundle.user' ]] || {
    printf '\n%s' "$cbg_blue >> Creating user plugin directory:$c_reset"
    process_status="$(install -d 'vim/bundle.user' 2>&1)"

    if (( ! $? )); then
        printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
    else
        printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
        error 'install -d vim/bundle.user' "User plugin directory couldn't be created" "$process_status"
    fi
}

# create vim/vimrc.user if it doesn't exist
[[ -e 'vim/vimrc.user' ]] || {
    printf '\n%s' "$cbg_blue >> Creating user config file:$c_reset"
    process_status="$(touch 'vim/vimrc.user' 2>&1)"

    if (( ! $? )); then
        {
            printf '%s\n%s\n\n' '"Autostart Filer in empty buffers: (*1:filer loads in new empty buffers | 0:filer must be triggered)' '"let g:autostartfiler=1'
            printf '%s\n%s\n\n' '"Autocheck syntax checking: (1:start toggled on | *0:start toggled off)' '"let g:autostartchecker=0'
            printf '%s\n%s\n\n' '"Autoload Tagbar: (1:start open | *0:start closed)' '"let g:autostarttagbar=0'
            printf '%s\n%s\n\n' '"Disable automatic tag generation and highlighting: (1:force disabled tag generation and highlighting | *0:enable automatic tag generation and highlighting)' '"let g:disableautotags=0'
            printf '%s\n%s\n\n' '"Disable automatic linebreaking: (1:force disabled globally | *0:let the filetype decide)' '"let g:disablelinebreaks=0'
            printf '%s\n%s\n\n' '"Enable Powerline fonts: (1:expect powerline font | *0:expect regular font)' '"let g:powerlinefonts=0 "(set powerline font for gvim and terminal when enabled)'
            printf '%s\n%s\n' '"GVim font selection: (Escaping spaces and use powerline if appropriate)' '"set guifont=Monospace\ 12'
        } >> vim/vimrc.user

        if [[ -e 'vim/vimrc.user' ]]; then
            printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
        else
            printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
        fi
    else
        printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
        error "touch vim/vimrc.user" "User config couldn't be created" "$process_status"
    fi
}

### REPO UPDATE
printf '\n%s' "$cbg_blue >> Updating darkcloud-vimconfig:$c_reset"
process_status="$(git pull origin master 2>&1)"

if (( ! $? )); then
    printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
else
    printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
    error 'git pull origin master' 'Git failed to sync the repo' "$process_status"
    exit 1
fi

### SUBMODULE UPDATE {
printf '\n%s\n' "$cbg_blue >> Updating plugin submodules >> $c_reset"
printf '%s' "$cbg_blue $c_reset$cbg_yellow + Updating plugin URLs:$c_reset"
process_status="$(git submodule sync 2>&1)"

if (( ! $? )); then
    printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
else
    printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
    error 'git submodule sync' 'Git failed to sync the submodules' "$process_status"
fi

# update each submodule to the new head and run 'git fetch --all'
printf '%s' "$cbg_blue $c_reset$cbg_yellow + Fetching updates:$c_reset"
git submodule foreach git reset --hard >/dev/null 2>&1
process_status="$(git submodule foreach git fetch --all 2>&1)"

if (( ! $? )); then
    process_status=$(git submodule update --init --recursive 2>&1)

    if (( ! $? )); then
        printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
    else
        printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
        error 'git submodule update --init --recursive' 'Git failed to update the submodules' "$process_status"
    fi
else
    printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
    error 'git submodule foreach git fetch --all' "Git failed to fetch the submodules from their respective remotes" "$process_status"
fi

# run 'git checkout origin/master' on each submodule
printf '%s' "$cbg_blue $c_reset$cbg_yellow + Checkout updates:$c_reset"
process_status="$(git submodule foreach git checkout -f origin/master 2>&1)"

if (( ! $? )); then
    printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
else
    printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
    error 'git submodule foreach git checkout -f origin/master' 'Git failed to checkout the submodules into origin/master' "$process_status"
fi

# clean plugin directories and remove plugins no longer in the repo
printf '\n%s\n' "$cbg_blue >> Clean plugin directories >> $c_reset"
printf '%s' "$cbg_blue $c_reset$cbg_yellow + Remove untracked files:$c_reset"
process_status="$(git submodule foreach git clean -dxf 2>&1)"

if (( ! $? )); then
    printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
else
    printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
    error 'git submodule foreach git clean -dxf' 'Git failed to remove untracked files' "$process_status"
fi

[[ -f '.gitmodules' ]] && {
    for plugin in vim/bundle/*; do
        [[ -f "$plugin/.git" ]] && {
            plugin_dirname="${plugin/*\/}"

            grep 'path = ' .gitmodules | egrep -o '[^\/]*$' | egrep -q "$plugin_dirname$" || {
                [[ -z "$first_found" ]] && {
                    first_found=1
                    printf '%s\n' "$cbg_blue $c_reset$cbg_yellow + Removing old plugins: $c_reset"
                }

                process_status="$(rm -rf "${plugin:?}")"

                if (( ! $? )); then
                    printf '%s\n' "$cbg_blue $c_reset$cbg_yellow = $cfg_white_bold$plugin$c_reset"
                else
                    error "rm -rf $plugin" "Folder couldn't be deleted" "$process_status"
                    exit 1
                fi
            }
        }
    done

    printf '\n'
}

### USER PLUGIN UPDATE
[[ -d vim/bundle.user ]] && find vim/bundle.user -mindepth 3 -maxdepth 3 -name config | grep -q '.git/config' && {
    printf '%s\n' "$cbg_blue >> Updating user plugins >> $c_reset"
    pushd 'vim/bundle.user' >/dev/null

    for plugin in *; do
        [[ -d "$plugin/.git" ]] && {
            pushd "$plugin" >/dev/null
            printf '%s' "$cbg_blue $c_reset$cbg_yellow + Updating 'vim/bundle.user/$plugin':$c_reset"
            process_status="$(git pull origin master 2>&1)"

            if (( ! $? )); then
                if ! grep -q "Already up-to-date" <<< "$process_status"; then
                    printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
                else
                    printf '%s\n' "$cfg_white_bold UP TO DATE $c_reset"
                fi
            else
                error 'git pull origin master' "Failed pulling changes for $plugin" "$process_status"
            fi

            popd >/dev/null
        }
    done

    popd >/dev/null
    printf '\n'
}

### GENERATE PLUGIN HELP
[[ $(type -P vim) ]] && {
    printf '%s' "$cbg_blue >> Generating plugin help:$c_reset"
    $timeout_command --preserve-status --foreground 1m vim -u "./vimrc" -c "Helptags|qa!"

    if (( ! $? )); then
        printf '%s\n' "$cfg_green_bold SUCCESS! $c_reset"
    else
        reset -I
        printf '%s\n' "$cfg_red_bold FAIL! $c_reset"
        error 'vim -u "./vimrc" -c "Helptags|qa!"' 'Generating helpdocs for the submodules failed'
    fi
}

### FINISH
printf '\n%s\n\n' "$cbg_black ~~~ Update Complete ~~~ $c_reset"