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# Intelligent PATH management with existence checking and deduplication

# Ensure we have a clean slate for PATH manipulation
typeset -U path PATH  # Remove duplicates automatically

# Define potential paths in priority order
declare -a potential_paths=(
    "$HOME/bin"                                           # Personal scripts
    "$HOME/.local/bin"                                    # User-installed binaries
    "/opt/homebrew/bin"                                   # Homebrew (Apple Silicon)
    "/opt/homebrew/sbin"                                  # Homebrew system binaries
    "/usr/local/bin"                                      # Homebrew (Intel)
    "/usr/local/sbin"                                     # System binaries
    "/opt/homebrew/opt/python@3.13/libexec/bin"         # Python 3.13
    "/opt/homebrew/opt/python@3.12/libexec/bin"         # Python 3.12 (fallback)
    "$HOME/.cargo/bin"                                    # Rust binaries
    "/opt/homebrew/opt/gnu-sed/libexec/gnubin"          # GNU sed
    "/opt/homebrew/opt/gnu-tar/libexec/gnubin"          # GNU tar
    "/opt/homebrew/opt/coreutils/libexec/gnubin"        # GNU coreutils
)

# Build PATH intelligently
build_path() {
    local new_paths=()
    
    # Add existing paths that we want to keep
    for existing_path in "${path[@]}"; do
        case "$existing_path" in
            # Skip paths we're going to add explicitly
            "$HOME/bin"|"$HOME/.local/bin"|"/opt/homebrew"*|"/usr/local"*|"$HOME/.cargo/bin") ;;
            # Keep system paths and others
            *) new_paths+=("$existing_path") ;;
        esac
    done
    
    # Add our curated paths (only if they exist)
    for check_path in "${potential_paths[@]}"; do
        if [[ -d "$check_path" ]]; then
            new_paths=("$check_path" "${new_paths[@]}")
        fi
    done
    
    # Rebuild PATH
    path=("${new_paths[@]}")
}

# Execute PATH building
build_path

# Verify critical tools are accessible
verify_path() {
    local critical_tools=(git zsh python3 brew)
    local missing_tools=()
    
    for tool in "${critical_tools[@]}"; do
        if ! command -v "$tool" >/dev/null 2>&1; then
            missing_tools+=("$tool")
        fi
    done
    
    if (( ${#missing_tools[@]} > 0 )); then
        echo "⚠️  Missing critical tools: ${missing_tools[*]}"
        echo "💡 Consider running: brew install ${missing_tools[*]}"
    fi
}

# Run verification only in interactive shells
[[ $- == *i* ]] && verify_path

# MANPATH configuration for enhanced man pages
if [[ -d "/opt/homebrew/share/man" ]]; then
    export MANPATH="/opt/homebrew/share/man:$MANPATH"
fi

# Info path for GNU info pages
if [[ -d "/opt/homebrew/share/info" ]]; then
    export INFOPATH="/opt/homebrew/share/info:$INFOPATH"
fi