#!/bin/sh
# Shattershard terminal setup — https://shattershard.com/terminal
#
#   curl -fsSL https://shattershard.com/setup.sh | sh
#
# Does the 5 steps from the page: Homebrew, zsh plugins, SF Mono Nerd Font,
# the Brogrammer Terminal.app theme and ~/.zshrc (your old one is backed up).
# Safe to run again. Preview without changing anything:
#
#   curl -fsSL https://shattershard.com/setup.sh | DRY_RUN=1 sh

# Everything lives in main(), called on the last line: when piped from curl,
# the whole script is downloaded before anything runs.

SITE="https://shattershard.com"

bold() { printf '\033[1m%s\033[0m\n' "$1"; }
step() { printf '\n\033[1;31m▸\033[0m \033[1m%s\033[0m\n' "$1"; }
info() { printf '  %s\n' "$1"; }
fail() { printf '\n\033[1;31m✗ %s\033[0m\n' "$1" >&2; exit 1; }

run() {
    if [ -n "$DRY_RUN" ]; then
        printf '  \033[2m[dry run] %s\033[0m\n' "$*"
    else
        "$@"
    fi
}

ask() {
    # stdin is the script itself when piped, so read the answer from the terminal
    if [ -n "$YES" ] || [ -n "$DRY_RUN" ]; then return 0; fi
    if [ ! -r /dev/tty ]; then fail "No terminal to ask for confirmation. Re-run with YES=1."; fi
    printf '%s [y/N] ' "$1"
    read -r answer < /dev/tty
    case "$answer" in y|Y|yes|YES) return 0 ;; *) return 1 ;; esac
}

main() {
    [ "$(uname -s)" = "Darwin" ] || fail "This setup is for macOS (Terminal.app)."

    bold "Shattershard terminal setup"
    info "This will:"
    info "  1. install Homebrew (if missing)"
    info "  2. brew install zsh-autosuggestions zsh-syntax-highlighting"
    info "  3. brew install --cask font-sf-mono-nerd-font-ligaturized"
    info "  4. import the Brogrammer theme into Terminal.app and make it the default"
    info "  5. replace ~/.zshrc (the current one is backed up first)"
    [ -n "$DRY_RUN" ] && info "Dry run: nothing will be changed."
    echo
    ask "Continue?" || { info "Cancelled."; exit 0; }

    # 1. Homebrew
    step "Homebrew"
    if command -v brew >/dev/null 2>&1; then
        info "already installed: $(brew --version | head -1)"
    else
        info "installing Homebrew (it may ask for your password)"
        # Give the installer the real terminal, not our piped script
        run /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)" < /dev/tty \
            || fail "Homebrew installation failed."
    fi

    # Make brew usable in this shell and in future ones
    for prefix in /opt/homebrew /usr/local; do
        if [ -x "$prefix/bin/brew" ]; then
            eval "$("$prefix/bin/brew" shellenv)"
            if ! grep -qs "brew shellenv" "$HOME/.zprofile"; then
                info "adding brew to ~/.zprofile"
                if [ -z "$DRY_RUN" ]; then
                    printf '\neval "$(%s/bin/brew shellenv)"\n' "$prefix" >> "$HOME/.zprofile"
                fi
            fi
            break
        fi
    done
    command -v brew >/dev/null 2>&1 || [ -n "$DRY_RUN" ] || fail "brew is not on PATH. Open a new terminal and run the script again."

    # 2. zsh plugins
    step "zsh plugins"
    for formula in zsh-autosuggestions zsh-syntax-highlighting; do
        if brew list --formula "$formula" >/dev/null 2>&1; then
            info "$formula: already installed"
        else
            run brew install "$formula" || fail "Could not install $formula."
        fi
    done

    # 3. Font
    step "SF Mono Nerd Font"
    if brew list --cask font-sf-mono-nerd-font-ligaturized >/dev/null 2>&1; then
        info "already installed"
    else
        run brew install --cask font-sf-mono-nerd-font-ligaturized || fail "Could not install the font."
    fi

    # 4. Terminal theme
    step "Brogrammer theme"
    theme="$HOME/Downloads/Brogrammer.terminal"
    run curl -fsSL "$SITE/assets/files/Brogrammer.terminal" -o "$theme" || fail "Could not download the theme."
    if defaults read com.apple.Terminal "Window Settings" 2>/dev/null | grep -q '"Brogrammer"\|Brogrammer ='; then
        info "already imported into Terminal.app"
    else
        info "opening it imports the profile into Terminal.app (a new window will open)"
        run open "$theme"
        [ -z "$DRY_RUN" ] && sleep 2
    fi
    run defaults write com.apple.Terminal "Default Window Settings" -string "Brogrammer"
    run defaults write com.apple.Terminal "Startup Window Settings" -string "Brogrammer"
    info "set as the default profile for new windows"

    # 5. .zshrc
    step "~/.zshrc"
    backup=""
    if [ -f "$HOME/.zshrc" ]; then
        backup="$HOME/.zshrc.bak.$(date +%Y%m%d-%H%M%S)"
        run cp "$HOME/.zshrc" "$backup"
        info "backed up your current file to $backup"
        info "tip: move API keys and tokens from it into ~/.zsh_secrets — the new .zshrc loads that file"
    fi
    run curl -fsSL "$SITE/assets/files/zshrc.txt" -o "$HOME/.zshrc" || fail "Could not download .zshrc."

    echo
    bold "✓ Done. Open a new Terminal window to see it."
    [ -n "$backup" ] && info "Changed your mind? cp \"$backup\" ~/.zshrc"
    return 0
}

main "$@"