refactor(config):将原先边界过宽或是职责细碎的部分重构

internal/config/config.go

@@ -0,0 +1,185 @@
+package config
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	goruntime "runtime"
+	"strings"
+)
+
+const (
+	DefaultWorkdir        = "."
+	DefaultMaxLoops       = 8
+	DefaultToolTimeoutSec = 20
+)
+
+type Config struct {
+	Providers        []ProviderConfig `yaml:"-"`
+	SelectedProvider string           `yaml:"selected_provider"`
+	CurrentModel     string           `yaml:"current_model"`
+	Workdir          string           `yaml:"-"`
+	Shell            string           `yaml:"shell"`
+	MaxLoops         int              `yaml:"max_loops,omitempty"`
+	ToolTimeoutSec   int              `yaml:"tool_timeout_sec,omitempty"`
+	Context          ContextConfig    `yaml:"context,omitempty"`
+	Tools            ToolsConfig      `yaml:"tools,omitempty"`
+	Memo             MemoConfig       `yaml:"memo,omitempty"`
+}
+
+// StaticDefaults 返回 config 层负责的静态默认值骨架，不包含 provider 装配和选择状态修复。
+func StaticDefaults() *Config {
+	return &Config{
+		Workdir:        DefaultWorkdir,
+		Shell:          defaultShell(),
+		MaxLoops:       DefaultMaxLoops,
+		ToolTimeoutSec: DefaultToolTimeoutSec,
+		Context:        defaultContextConfig(),
+		Tools: ToolsConfig{
+			WebFetch: defaultWebFetchConfig(),
+			MCP:      defaultMCPConfig(),
+		},
+		Memo: defaultMemoConfig(),
+	}
+}
+
+func (c *Config) Clone() Config {
+	if c == nil {
+		return *StaticDefaults()
+	}
+
+	clone := *c
+	clone.Providers = cloneProviders(c.Providers)
+	clone.Context = c.Context.Clone()
+	clone.Tools = c.Tools.Clone()
+	clone.Memo = c.Memo.Clone()
+	return clone
+}
+
+// applyStaticDefaults 仅补齐静态配置默认值
+func (c *Config) applyStaticDefaults(defaults Config) {
+	if c == nil {
+		return
+	}
+
+	if strings.TrimSpace(c.Workdir) == "" {
+		c.Workdir = defaults.Workdir
+	}
+	if strings.TrimSpace(c.Shell) == "" {
+		c.Shell = defaults.Shell
+	}
+	if c.MaxLoops <= 0 {
+		c.MaxLoops = defaults.MaxLoops
+	}
+	if c.ToolTimeoutSec <= 0 {
+		c.ToolTimeoutSec = defaults.ToolTimeoutSec
+	}
+	c.Context.ApplyDefaults(defaults.Context)
+	c.Tools.ApplyDefaults(defaults.Tools)
+	c.Memo.ApplyDefaults(defaults.Memo)
+
+	c.Workdir = normalizeWorkdir(c.Workdir)
+}
+
+// ValidateSnapshot 校验配置快照本身是否结构完整
+func (c *Config) ValidateSnapshot() error {
+	if c == nil {
+		return errors.New("config: config is nil")
+	}
+	if len(c.Providers) == 0 {
+		return errors.New("config: providers is empty")
+	}
+
+	seen := make(map[string]struct{}, len(c.Providers))
+	seenEndpoints := make(map[string]string, len(c.Providers))
+	for i, provider := range c.Providers {
+		if err := provider.Validate(); err != nil {
+			return fmt.Errorf("config: provider[%d]: %w", i, err)
+		}
+
+		key := normalizeProviderName(provider.Name)
+		if _, exists := seen[key]; exists {
+			return fmt.Errorf("config: duplicate provider name %q", provider.Name)
+		}
+		seen[key] = struct{}{}
+
+		identity, err := provider.Identity()
+		if err != nil {
+			return fmt.Errorf("config: provider[%d]: %w", i, err)
+		}
+		if existingName, exists := seenEndpoints[identity.Key()]; exists {
+			return fmt.Errorf(
+				"config: duplicate provider endpoint %q for providers %q and %q",
+				identity.String(),
+				existingName,
+				provider.Name,
+			)
+		}
+		seenEndpoints[identity.Key()] = provider.Name
+	}
+
+	if strings.TrimSpace(c.Workdir) == "" {
+		return errors.New("config: workdir is empty")
+	}
+	if !filepath.IsAbs(c.Workdir) {
+		return fmt.Errorf("config: workdir must be absolute, got %q", c.Workdir)
+	}
+	if err := c.Tools.Validate(); err != nil {
+		return fmt.Errorf("config: tools: %w", err)
+	}
+	if err := c.Context.Validate(); err != nil {
+		return fmt.Errorf("config: context: %w", err)
+	}
+	if err := c.Memo.Validate(); err != nil {
+		return fmt.Errorf("config: memo: %w", err)
+	}
+
+	return nil
+}
+
+func (c *Config) ProviderByName(name string) (ProviderConfig, error) {
+	if c == nil {
+		return ProviderConfig{}, errors.New("config: config is nil")
+	}
+
+	target := normalizeProviderName(name)
+	for _, provider := range c.Providers {
+		if normalizeProviderName(provider.Name) == target {
+			return provider, nil
+		}
+	}
+
+	return ProviderConfig{}, fmt.Errorf("config: provider %q not found", name)
+}
+
+func normalizeWorkdir(workdir string) string {
+	workdir = strings.TrimSpace(workdir)
+	if workdir == "" {
+		return ""
+	}
+
+	if workdir == "." {
+		if wd, err := os.Getwd(); err == nil {
+			return wd
+		}
+		return workdir
+	}
+
+	if filepath.IsAbs(workdir) {
+		return filepath.Clean(workdir)
+	}
+
+	if wd, err := os.Getwd(); err == nil {
+		return filepath.Clean(filepath.Join(wd, workdir))
+	}
+
+	return filepath.Clean(workdir)
+}
+
+func defaultShell() string {
+	if goruntime.GOOS == "windows" {
+		return "powershell"
+	}
+	return "bash"
+}