#!/usr/bin/env bash
set -euo pipefail

detect_pkg_manager() {
    if command -v apt &>/dev/null; then
        echo "apt"
    elif command -v dnf &>/dev/null; then
        echo "dnf"
    elif command -v pacman &>/dev/null; then
        echo "pacman"
    elif command -v zypper &>/dev/null; then
        echo "zypper"
    else
        echo "unknown"
    fi
}

install_fish() {
    local pm
    pm=$(detect_pkg_manager)
    case "$pm" in
        apt)
            sudo apt update && sudo apt install -y fish
            ;;
        dnf)
            sudo dnf install -y fish
            ;;
        pacman)
            sudo pacman -S --noconfirm fish
            ;;
        zypper)
            sudo zypper install -y fish
            ;;
        *)
            echo "No supported package manager found. Please install fish manually: https://fishshell.com"
            exit 1
            ;;
    esac
}

install_omf() {
    if [ ! -d "$HOME/.local/share/omf" ]; then
        echo "Installing Oh My Fish..."
        curl https://raw.githubusercontent.com/oh-my-fish/oh-my-fish/master/bin/install > install
        fish install --path=~/.local/share/omf --config=~/.config/omf
    else
        echo "Oh My Fish already installed."
    fi
}

install_bobthefish() {
    if command -v fish &>/dev/null && [ -f "$HOME/.local/share/omf/init.fish" ]; then
        echo "Installing bobthefish theme..."
        fish -c 'omf install bobthefish'
    fi
}

set_default_shell() {
    local fish_path
    fish_path=$(command -v fish)
    if [ "$SHELL" != "$fish_path" ]; then
        echo "Setting default shell to fish..."
        if grep -q "^$USER:" /etc/passwd 2>/dev/null; then
            chsh -s "$fish_path"
        else
            echo "Run this manually: chsh -s $fish_path"
        fi
    else
        echo "Fish is already your default shell."
    fi
}

main() {
    install_fish
    install_omf
    install_bobthefish
    set_default_shell

    echo
    echo "=== Installation complete ==="
    echo "Log out and back in, or run: exec fish"
}

main