package config

import (
	"os"
	"path/filepath"
	"strings"
)

// ResolveRoot returns the absolute workspace root path.
// Reads CTASK_ROOT env var, falls back to ~/ai-workspaces (or %USERPROFILE%\ai-workspaces on Windows).
func ResolveRoot() string {
	root := os.Getenv("CTASK_ROOT")
	if root == "" {
		home, _ := os.UserHomeDir()
		return filepath.Join(home, "ai-workspaces")
	}
	// Expand leading tilde
	if strings.HasPrefix(root, "~/") || root == "~" {
		home, _ := os.UserHomeDir()
		root = filepath.Join(home, root[2:])
	}
	abs, err := filepath.Abs(root)
	if err != nil {
		return root
	}
	return abs
}

// ResolveAgent returns the agent command.
// Reads CTASK_AGENT env var, falls back to "claude".
func ResolveAgent() string {
	agent := os.Getenv("CTASK_AGENT")
	if agent == "" {
		return "claude"
	}
	return agent
}

// EnvVars returns the environment variables to export into child sessions.
func EnvVars(slug, mode, root, workspace, category string) map[string]string {
	return map[string]string{
		"CTASK_TASK":      slug,
		"CTASK_MODE":      mode,
		"CTASK_ROOT":      root,
		"CTASK_WORKSPACE": workspace,
		"CTASK_CATEGORY":  category,
	}
}