# Switches
MINIMAL_PROMPT="${MINIMAL_PROMPT:-yes}"
MINIMAL_RPROMPT="${MINIMAL_RPROMPT:-yes}"
MINIMAL_MAGIC_ENTER="${MINIMAL_MAGIC_ENTER:-yes}"

# Parameters
MINIMAL_OK_COLOR="${MINIMAL_OK_COLOR:-2}"
MINIMAL_USER_CHAR="${MINIMAL_USER_CHAR:-λ}"
MINIMAL_INSERT_CHAR="${MINIMAL_INSERT_CHAR:-›}"
MINIMAL_NORMAL_CHAR="${MINIMAL_NORMAL_CHAR:-·}"
MINIMAL_PWD_LEN="${MINIMAL_PWD_LEN:-2}"
MINIMAL_PWD_CHAR_LEN="${MINIMAL_PWD_CHAR_LEN:-10}"
MINIMAL_MAGIC_ENTER_MARGIN="${MINIMAL_MAGIC_ENTER_MARGIN:-  | }"

# check if function exists
function _isfn {
    type -w "$1" | grep -wq function
}

# Extensions
if ! _isfn minimal_magic_output; then
    function minimal_magic_output {
        minimal_magic_output_base
    }
fi

if ! _isfn minimal_vcs; then
    function minimal_vcs {
        # git
        local statc="%{\e[0;3${MINIMAL_OK_COLOR}m%}" # assumes is clean
        local bname="$(git rev-parse --abbrev-ref HEAD 2> /dev/null)"

        if [ -n "$bname" ]; then
            [ -n "$(git status --porcelain 2> /dev/null)" ] &&\
                statc="%{\e[0;31m%}"
            echo -n " $statc$bname%{\e[0m%}"
        fi
    }
fi

if ! _isfn minimal_env; then
    function minimal_env {
        # python virtual env
        if [ -n "$VIRTUAL_ENV" ]; then
            _venv="$(basename $VIRTUAL_ENV)"
            echo -n "${_venv%%.*} "
        fi
    }
fi

# Setup
autoload -U colors && colors
setopt prompt_subst

_grey="\e[38;5;244m"
_greyp="%{$_grey%}"

# Left Prompt
function minimal_lprompt {
    local user_status="%{\e[%(1j.4.0);3%(0?.$MINIMAL_OK_COLOR.1)m%}\
%(!.#.$MINIMAL_USER_CHAR)"
    local kmstatus="$MINIMAL_INSERT_CHAR"
    [ "$KEYMAP" = 'vicmd' ] && kmstatus="$MINIMAL_NORMAL_CHAR"

    echo -n "$user_status%{\e[0m%} $kmstatus"
}

function minimal_ps2 {
    local kmstatus="$MINIMAL_INSERT_CHAR"
    local offset="$((${#_venv} + 2))"
    [ "$KEYMAP" = 'vicmd' ] && kmstatus="$MINIMAL_NORMAL_CHAR"

    printf " %.0s" {1..$offset}
    echo -n "$kmstatus"
}

# Right Prompt
function minimal_path {
    local w="%{\e[0m%}"
    local cwd="%${MINIMAL_PWD_LEN}~"
    local pi=""
    local len="$MINIMAL_PWD_CHAR_LEN"
    [ "$len" -lt 4 ] && len=4
    local hlen=$((len / 2 - 1))
    cwd="${(%)cwd}"
    cwd=("${(@s:/:)cwd}")

    for i in {1..${#cwd}}; do
        pi="$cwd[$i]"
        [ "${#pi}" -gt "$len" ] && cwd[$i]="${pi:0:$hlen}$w..$_greyp${pi: -$hlen}"
    done

    echo -n "$_greyp${(j:/:)cwd//\//$w/$_greyp}$w"
}

# Magic Enter
function minimal_infoline {
        local last_err="$1"
        local w="\e[0m"
        local rn="\e[0;31m"
        local rb="\e[1;31m"

        local user_host_pwd="$_grey%n$w@$_grey%m$w:$_grey%~$w"
        user_host_pwd="${${(%)user_host_pwd}//\//$w/$_grey}"

        local v_files="$(ls -1 | sed -n '$=')"
        local h_files="$(ls -1A | sed -n '$=')"

        local job_n="$(jobs | sed -n '$=')"

        local iline="[$user_host_pwd] [$_grey${v_files:-0}$w ($_grey${h_files:-0}$w)]"
        [ "$job_n" -gt 0 ] && iline="$iline [$_grey$job_n$w&]"

        if [ "$last_err" != "0" ]; then
                iline="$iline \e[1;31m[\e[0;31m$last_err\e[1;31m]$w"
        fi

        echo "$iline"
}

function minimal_magic_output_base {
    local margin="${#MINIMAL_MAGIC_ENTER_MARGIN}"

    if [ "$(dirs -p | wc -l)" -gt 1 ]; then
        local stack="$(dirs)"
        echo "[${_grey}dirs\e[0m - ${_grey}${stack//\//\e[0m/$_grey}\e[0m]"
    fi

    if [ "$(uname)" = "Darwin" ] && ! ls --version &> /dev/null; then
        COLUMNS=$((COLUMNS - margin)) CLICOLOR_FORCE=1 ls -C -G
    else
        ls -C --color="always" -w $((COLUMNS - margin))
    fi

    git -c color.status=always status -sb 2> /dev/null
}

function minimal_wrap_output {
    local output="$1"
    local output_len="$(echo "$output" | sed -n '$=')"
    if [ -n "$output" ]; then
        if [ "$output_len" -gt "$((LINES - 2))" -a -n "$PAGER" ]; then
            printf "$output\n" | "$PAGER" -R
        else
            printf "$output\n" | sed "s/^/$MINIMAL_MAGIC_ENTER_MARGIN/"
        fi
    fi
}

function minimal_magic_enter {
    local last_err="$?" # I need to capture this ASAP

    if [ -z "$BUFFER" ]; then
        minimal_infoline $last_err
        minimal_wrap_output "$(minimal_magic_output)"
        zle redisplay
    else
        zle accept-line
    fi
}

# Apply Switches
if [ "$MINIMAL_PROMPT" = "yes" ]; then
    # prompt redraw on vimode change
    function reset_prompt {
        zle reset-prompt
    }

    zle -N zle-line-init reset_prompt
    zle -N zle-keymap-select reset_prompt

    PROMPT='$(minimal_env)$(minimal_lprompt) '
    PS2='$(minimal_ps2) '
    [ "$MINIMAL_RPROMPT" = "yes" ] && RPROMPT='$(minimal_path)$(minimal_vcs)'
fi

if [ "$MINIMAL_MAGIC_ENTER" = "yes" ]; then
    zle -N minimal-magic-enter minimal_magic_enter
    bindkey -M main  "^M" minimal-magic-enter
    bindkey -M vicmd "^M" minimal-magic-enter
fi