#!/bin/bash
# Core tinsnip shared library functions

# Color constants
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

# Shared logging functions with customizable prefix
log_with_prefix() {
    local prefix="$1"
    shift
    echo -e "${GREEN}[$prefix]${NC} $*" >&2
}

error_with_prefix() {
    local prefix="$1"
    shift
    echo -e "${RED}[ERROR]${NC} $*" >&2
    exit 1
}

warn_with_prefix() {
    local prefix="$1"
    shift
    echo -e "${YELLOW}[WARNING]${NC} $*" >&2
}

# Get current sheet (from environment, file, or default)
get_sheet() {
    # Use sheet from environment, file, or default
    if [[ -n "${TIN_SHEET:-}" ]]; then
        echo "$TIN_SHEET"
    elif [[ -f "/etc/tinsnip-sheet" ]]; then
        cat "/etc/tinsnip-sheet"
    else
        echo "topsheet"
    fi
}

# Update shell configuration files (.bashrc or .profile) with environment variables
# Usage: update_shell_config username config_file "VAR1=value1" "VAR2=value2" ...
update_shell_config() {
    local username="$1"
    local config_file="$2"
    shift 2
    local env_vars=("$@")
    
    sudo -u "$username" -i bash << EOF
# Remove any existing environment variables to avoid duplicates
grep -v "$(printf "%s\\\\|" "${env_vars[@]}" | sed 's/=.*/=/g' | sed 's/\\\\|$//')" ~/$config_file > ~/${config_file}.tmp 2>/dev/null && mv ~/${config_file}.tmp ~/$config_file || touch ~/$config_file

# Add environment variables
cat >> ~/$config_file << 'CONFIG_EOF'

# Environment variables managed by tinsnip
$(printf "export %s\n" "${env_vars[@]}")
CONFIG_EOF
EOF
}

# Create service environment file on NFS mount with all variables needed by service
create_service_env_file() {
    local service_name="$1"
    local service_env="$2"
    local service_uid="$3"
    local mount_point="/mnt/${service_name}-${service_env}"
    local sheet="${TIN_SHEET:-topsheet}"
    
    local env_file="$mount_point/.env"
    
    log_with_prefix "Service Env" "Creating $env_file"
    
    # Create the .env file with all service variables
    sudo -u "${service_name}-${service_env}" tee "$env_file" > /dev/null << EOF
# Tinsnip service environment variables
# Generated automatically - do not edit manually
TIN_SERVICE_NAME=$service_name
TIN_SERVICE_ENVIRONMENT=$service_env
TIN_SERVICE_UID=$service_uid
TIN_SHEET=$sheet

# XDG Base Directory variables (NFS-backed)
XDG_DATA_HOME=$mount_point/data
XDG_CONFIG_HOME=$mount_point/config
XDG_STATE_HOME=$mount_point/state

# Docker environment (set by install_docker.sh if applicable)
# These will be added by Docker setup process
EOF

    log_with_prefix "Service Env" "Created service environment file"
}

# Create service environment loader script and integrate with shell configs
# This creates a standalone script file to avoid shell expansion issues
create_service_env_loader_script() {
    local service_user="$1"
    local script_path="/home/$service_user/.tinsnip-env-loader.sh"
    
    log_with_prefix "Env Loader" "Creating environment loader script: $script_path"
    
    # Create environment loader for machine metadata (post-ACT-2)
    sudo bash -c "cat > '$script_path'" << 'EOF'
#!/bin/bash
# Tinsnip machine environment loader (ACT-2: centralized metadata)
export XDG_CACHE_HOME="${XDG_CACHE_HOME:-$HOME/.cache}"

# Load machine environment variables from centralized metadata
# Pattern: ^.+-[^-]+$ matches machinename-env (machine can have dashes, env cannot)
if [[ "$(whoami)" =~ ^.+-[^-]+$ ]]; then
    TIN_MACHINE_ENV_FILE="/mnt/$(whoami)/.machine/machine.env"
    TIN_MACHINE_ENV_CACHE="$XDG_CACHE_HOME/tinsnip/$(whoami).env"

    if [[ -f "$TIN_MACHINE_ENV_FILE" ]]; then
        source "$TIN_MACHINE_ENV_FILE"
        mkdir -p "$(dirname "$TIN_MACHINE_ENV_CACHE")"
        cp "$TIN_MACHINE_ENV_FILE" "$TIN_MACHINE_ENV_CACHE" 2>/dev/null || true
    elif [[ -f "$TIN_MACHINE_ENV_CACHE" ]]; then
        source "$TIN_MACHINE_ENV_CACHE"
    fi

    # Export essential variables for Docker and tinsnip
    if [[ -n "${TIN_MACHINE_NAME:-}" ]]; then
        export TIN_MACHINE_NAME TIN_MACHINE_ENVIRONMENT TIN_SERVICE_UID TIN_SHEET
        export DOCKER_HOST

        # Set XDG_RUNTIME_DIR if not already set (needed for Docker socket access)
        if [[ -z "${XDG_RUNTIME_DIR:-}" ]]; then
            export XDG_RUNTIME_DIR="/run/user/${TIN_SERVICE_UID}"
        fi
    fi
fi
EOF
    
    # Fix ownership and permissions
    sudo chown "$service_user:$service_user" "$script_path"
    sudo chmod 755 "$script_path"
    
    # Debug: Check what the actual permissions are
    log_with_prefix "Debug" "File permissions after setting:"
    sudo ls -la "$script_path" || true
    
    # Validate the loader script syntax (using root to avoid permission issues)
    if ! sudo bash -n "$script_path" 2>/tmp/syntax_error.log; then
        warn_with_prefix "Env Loader" "⚠️  Syntax error in loader script!"
        log_with_prefix "Debug" "Syntax error details:"
        sudo cat /tmp/syntax_error.log 2>/dev/null || true
        log_with_prefix "Debug" "Script content:"
        sudo head -10 "$script_path" 2>/dev/null || true
        return 1
    else
        log_with_prefix "Env Loader" "Loader script syntax validated successfully"
    fi
    
    log_with_prefix "Env Loader" "Adding script to shell configurations"
    
    # Add source line to both shell configs using sudo with explicit paths
    log_with_prefix "Env Loader" "Updating .bashrc"
    # Check if already added to avoid duplicates
    if ! sudo grep -q "tinsnip-env-loader" "/home/$service_user/.bashrc" 2>/dev/null; then
        if echo "source ~/.tinsnip-env-loader.sh" | sudo tee -a "/home/$service_user/.bashrc" > /dev/null 2>&1; then
            sudo chown "$service_user:$service_user" "/home/$service_user/.bashrc"
            log_with_prefix "Env Loader" "Added to .bashrc"
        else
            warn_with_prefix "Env Loader" "⚠️  Failed to update .bashrc"
        fi
    else
        log_with_prefix "Env Loader" ".bashrc already configured"
    fi
    
    log_with_prefix "Env Loader" "Updating .profile"
    # Check if already added to avoid duplicates  
    if ! sudo grep -q "tinsnip-env-loader" "/home/$service_user/.profile" 2>/dev/null; then
        if echo "source ~/.tinsnip-env-loader.sh" | sudo tee -a "/home/$service_user/.profile" > /dev/null 2>&1; then
            sudo chown "$service_user:$service_user" "/home/$service_user/.profile"
            log_with_prefix "Env Loader" "Added to .profile"
        else
            warn_with_prefix "Env Loader" "⚠️  Failed to update .profile"
        fi
    else
        log_with_prefix "Env Loader" ".profile already configured"
    fi
    
    # Test if the shell configs can be sourced without errors (with better debugging)
    log_with_prefix "Env Loader" "Validating shell configurations"
    
    # Check .bashrc
    if ! sudo -u "$service_user" bash -n "/home/$service_user/.bashrc" 2>/dev/null; then
        warn_with_prefix "Env Loader" "⚠️  Syntax error in .bashrc - checking content"
        # Show last few lines for debugging
        sudo tail -5 "/home/$service_user/.bashrc" | while read -r line; do
            log_with_prefix "Debug" ".bashrc: $line"
        done 2>/dev/null || true
    fi
    
    # Check .profile  
    if ! sudo -u "$service_user" bash -n "/home/$service_user/.profile" 2>/dev/null; then
        warn_with_prefix "Env Loader" "⚠️  Syntax error in .profile - checking content"
        # Show last few lines for debugging
        sudo tail -5 "/home/$service_user/.profile" | while read -r line; do
            log_with_prefix "Debug" ".profile: $line"
        done 2>/dev/null || true
    fi
    
    log_with_prefix "Env Loader" "Environment loader script configured"
}

# Auto-discover NAS server for current sheet
discover_nas_for_sheet() {
    local sheet
    sheet=$(get_sheet)
    
    # Check if topsheet.station-prod registry is available
    local registry_path="/mnt/station-prod/data/nas-credentials/nas-servers"
    if [[ -f "$registry_path" ]]; then
        # First check if explicitly registered for this sheet
        local nas_server=$(grep "^${sheet}=" "$registry_path" 2>/dev/null | cut -d= -f2)
        if [[ -n "$nas_server" ]]; then
            echo "$nas_server"
            return 0
        fi
        
        # Only fall back to default for registered sheets
        # Check if this sheet exists in the sheet registry
        local sheet_registry="/mnt/station-prod/data/sheets"
        if [[ -f "$sheet_registry" ]] && grep -q "^${sheet}=" "$sheet_registry" 2>/dev/null; then
            nas_server=$(grep "^default=" "$registry_path" 2>/dev/null | cut -d= -f2)
            if [[ -n "$nas_server" ]]; then
                echo "$nas_server"
                return 0
            fi
        fi
    fi
    
    # Registry not available or no server found
    return 1
}