function setup_using_base_dir() {
    local fzf_base fzf_shell fzfdirs dir

    test -d "${FZF_BASE}" && fzf_base="${FZF_BASE}"

    if [[ -z "${fzf_base}" ]]; then
        fzfdirs=(
          "${HOME}/.fzf"
          "${HOME}/.nix-profile/share/fzf"
          "/usr/local/opt/fzf"
          "/usr/share/fzf"
          "/usr/local/share/examples/fzf"
        )
        for dir in ${fzfdirs}; do
            if [[ -d "${dir}" ]]; then
                fzf_base="${dir}"
                break
            fi
        done

        if [[ -z "${fzf_base}" ]]; then
            if (( ${+commands[brew]} )) && dir="$(brew --prefix fzf 2>/dev/null)"; then
                if [[ -d "${dir}" ]]; then
                    fzf_base="${dir}"
                fi
            fi
        fi
    fi

    if [[ ! -d "${fzf_base}" ]]; then
        return 1
    fi

    # Fix fzf shell directory for Arch Linux, NixOS or Void Linux packages
    if [[ ! -d "${fzf_base}/shell" ]]; then
        fzf_shell="${fzf_base}"
    else
        fzf_shell="${fzf_base}/shell"
    fi

    # Setup fzf binary path
    if (( ! ${+commands[fzf]} )) && [[ "$PATH" != *$fzf_base/bin* ]]; then
        export PATH="$PATH:$fzf_base/bin"
    fi

    # Auto-completion
    if [[ -o interactive && "$DISABLE_FZF_AUTO_COMPLETION" != "true" ]]; then
        source "${fzf_shell}/completion.zsh" 2> /dev/null
    fi

    # Key bindings
    if [[ "$DISABLE_FZF_KEY_BINDINGS" != "true" ]]; then
        source "${fzf_shell}/key-bindings.zsh"
    fi
}


function setup_using_debian_package() {
    if (( ! $+commands[dpkg] )) || ! dpkg -s fzf &>/dev/null; then
        # Either not a debian based distro, or no fzf installed
        return 1
    fi

    # NOTE: There is no need to configure PATH for debian package, all binaries
    # are installed to /usr/bin by default

    # Determine completion file path: first bullseye/sid, then buster/stretch
    local completions="/usr/share/doc/fzf/examples/completion.zsh"
    [[ -f "$completions" ]] || completions="/usr/share/zsh/vendor-completions/_fzf"

    local key_bindings="/usr/share/doc/fzf/examples/key-bindings.zsh"

    # Auto-completion
    if [[ -o interactive && "$DISABLE_FZF_AUTO_COMPLETION" != "true" ]]; then
        source $completions 2> /dev/null
    fi

    # Key bindings
    if [[ ! "$DISABLE_FZF_KEY_BINDINGS" == "true" ]]; then
        source $key_bindings
    fi

    return 0
}

function setup_using_opensuse_package() {
    # OpenSUSE installs fzf in /usr/bin/fzf
    # If the command is not found, the package isn't installed
    (( $+commands[fzf] )) || return 1

    # The fzf-zsh-completion package installs the auto-completion in
    local completions="/usr/share/zsh/site-functions/_fzf"
    # The fzf-zsh-completion package installs the key-bindings file in
    local key_bindings="/etc/zsh_completion.d/fzf-key-bindings"

    # If these are not found: (1) maybe we're not on OpenSUSE, or
    # (2) maybe the fzf-zsh-completion package isn't installed.
    if [[ ! -f "$completions" || ! -f "$key_bindings" ]]; then
        return 1
    fi

    # Auto-completion
    if [[ -o interactive && "$DISABLE_FZF_AUTO_COMPLETION" != "true" ]]; then
        source "$completions" 2>/dev/null
    fi

    # Key bindings
    if [[ "$DISABLE_FZF_KEY_BINDINGS" != "true" ]]; then
        source "$key_bindings" 2>/dev/null
    fi

    return 0
}

function setup_using_openbsd_package() {
    # openBSD installs fzf in /usr/local/bin/fzf
    if [[ "$OSTYPE" != openbsd* ]] || (( ! $+commands[fzf] )); then
        return 1
    fi

    # The fzf package installs the auto-completion in
    local completions="/usr/local/share/zsh/site-functions/_fzf_completion"
    # The fzf package installs the key-bindings file in
    local key_bindings="/usr/local/share/zsh/site-functions/_fzf_key_bindings"

    # Auto-completion
    if [[ -o interactive && "$DISABLE_FZF_AUTO_COMPLETION" != "true" ]]; then
        source "$completions" 2>/dev/null
    fi

    # Key bindings
    if [[ "$DISABLE_FZF_KEY_BINDINGS" != "true" ]]; then
        source "$key_bindings" 2>/dev/null
    fi

    return 0
}

function indicate_error() {
    cat >&2 <<EOF
[oh-my-zsh] fzf plugin: Cannot find fzf installation directory.
Please add \`export FZF_BASE=/path/to/fzf/install/dir\` to your .zshrc
EOF
}

# Indicate to user that fzf installation not found if nothing worked
setup_using_openbsd_package \
    || setup_using_debian_package \
    || setup_using_opensuse_package \
    || setup_using_base_dir \
    || indicate_error

unset -f setup_using_opensuse_package setup_using_debian_package setup_using_base_dir indicate_error

if [[ -z "$FZF_DEFAULT_COMMAND" ]]; then
    if (( $+commands[rg] )); then
        export FZF_DEFAULT_COMMAND='rg --files --hidden --glob "!.git/*"'
    elif (( $+commands[fd] )); then
        export FZF_DEFAULT_COMMAND='fd --type f --hidden --exclude .git'
    elif (( $+commands[ag] )); then
        export FZF_DEFAULT_COMMAND='ag -l --hidden -g "" --ignore .git'
    fi
fi
