// Package config implementiert die geschichtete Konfiguration aus
// Abschnitt 4.7: Defaults -> ~/.config/nub/config.toml -> <repo>/.nub/config.toml
// -> Umgebungsvariablen. Spätere Schicht gewinnt.
package config

import "nub/internal/llm/registry"

type Config struct {
	Version     int                 `toml:"version"`
	Model       ModelConfig         `toml:"model"`
	Endpoints   []Endpoint          `toml:"endpoint"`
	Context     ContextConfig       `toml:"context"`
	Skills      SkillsConfig        `toml:"skills"`
	MCP         []MCPServer         `toml:"mcp"`
	Profiles    map[string][]string `toml:"profiles"`
	Permissions PermissionsConfig   `toml:"permissions"`
}

type ModelConfig struct {
	Default  string `toml:"default"`
	Endpoint string `toml:"endpoint"`
}

type Endpoint struct {
	Name    string                `toml:"name"`
	BaseURL string                `toml:"base_url"`
	APIKey  string                `toml:"api_key"`
	Caps    registry.CapsOverride `toml:"caps"`
}

type ContextConfig struct {
	Files     []string `toml:"files"`
	WalkUp    bool     `toml:"walk_up"`
	MaxTokens int      `toml:"max_tokens"`
}

type SkillsConfig struct {
	Paths []string `toml:"paths"`
}

type MCPServer struct {
	Name    string   `toml:"name"`
	Command string   `toml:"command"`
	Args    []string `toml:"args"`
	URL     string   `toml:"url"`
	Tools   []string `toml:"tools"`
}

type PermissionsConfig struct {
	Read      string   `toml:"read"`
	Glob      string   `toml:"glob"`
	Grep      string   `toml:"grep"`
	Write     string   `toml:"write"`
	Edit      string   `toml:"edit"`
	Bash      string   `toml:"bash"`
	DenyPaths []string `toml:"deny_paths"`
	DenyBash  []string `toml:"deny_bash"`
}

// Defaults liefert die Konfiguration, die ohne jede Config-Datei gilt.
func Defaults() Config {
	return Config{
		Version: 1,
		Model:   ModelConfig{Default: "gpt-4o", Endpoint: "openai"},
		Endpoints: []Endpoint{
			{Name: "openai", BaseURL: "https://api.openai.com/v1", APIKey: "env:OPENAI_API_KEY"},
		},
		Context: ContextConfig{
			Files:     []string{"AGENTS.md", "REPOMAP.md"},
			WalkUp:    true,
			MaxTokens: 20000,
		},
		Skills: SkillsConfig{
			Paths: []string{"~/.nub/skills", ".nub/skills"},
		},
		Permissions: PermissionsConfig{
			Read: "auto", Glob: "auto", Grep: "auto",
			Write: "auto", Edit: "auto", Bash: "auto",
			DenyPaths: []string{".git/**", "**/.env", "**/id_rsa*"},
		},
	}
}