Add Go configuration model

internal/core/config/config.go

@@ -0,0 +1,147 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+)
+
+type WorkDirRetention string
+
+const (
+	WorkDirRetentionAuto   WorkDirRetention = "auto"
+	WorkDirRetentionAlways WorkDirRetention = "always"
+	WorkDirRetentionNever  WorkDirRetention = "never"
+)
+
+const (
+	DefaultModulesCSV                                   = "glossary,homophones,glossary,spoken_word,grammar"
+	DefaultPrimaryModel                                 = "openrouter/google/gemma-4-31b-it"
+	DefaultPrimaryBaseURL                               = "https://openrouter.ai/api/v1"
+	DefaultPrimaryLLMTimeoutSeconds                     = 600
+	DefaultMaxRetries                                   = 3
+	DefaultValidationMaxPromptTokens                    = 2048
+	DefaultMaxSectionTokens                             = 8192
+	DefaultMinSectionTokens                             = 2048
+	DefaultConfidenceThreshold                          = 0.8
+	DefaultNormalizeMaxSegmentGap                       = 4.0
+	DefaultNormalizeEllipsisGap                         = 3.5
+	DefaultNormalizeMaxSegmentDuration                  = 60.0
+	DefaultNormalizeMaxSegmentTokens                    = 2048
+	DefaultWorkDir                                      = "/tmp/audita"
+	DefaultWorkDirRetention            WorkDirRetention = WorkDirRetentionAuto
+)
+
+type Config struct {
+	Modules                   []string
+	PrimaryLLM                LLMConfig
+	ValidationLLM             ValidationLLMConfig
+	ValidationMaxPromptTokens int
+	MaxSectionTokens          int
+	MinSectionTokens          int
+	TargetSections            *int
+	Thresholds                ConfidenceThresholds
+	Normalization             NormalizationConfig
+	WorkDir                   string
+	WorkDirRetention          WorkDirRetention
+}
+
+type LLMConfig struct {
+	APIKey         string
+	Model          string
+	BaseURL        string
+	TimeoutSeconds int
+	MaxRetries     int
+}
+
+type ValidationLLMConfig struct {
+	APIKey         string
+	Model          string
+	BaseURL        string
+	TimeoutSeconds *int
+	MaxRetries     *int
+}
+
+type ConfidenceThresholds struct {
+	Glossary   float64
+	Grammar    float64
+	Homophones float64
+	SpokenWord float64
+}
+
+type NormalizationConfig struct {
+	MaxSegmentGap      float64
+	EllipsisGap        float64
+	MaxSegmentDuration float64
+	MaxSegmentTokens   int
+}
+
+func Default() Config {
+	modules, _ := ParseModulesCSV(DefaultModulesCSV)
+
+	return Config{
+		Modules: modules,
+		PrimaryLLM: LLMConfig{
+			Model:          DefaultPrimaryModel,
+			BaseURL:        DefaultPrimaryBaseURL,
+			TimeoutSeconds: DefaultPrimaryLLMTimeoutSeconds,
+			MaxRetries:     DefaultMaxRetries,
+		},
+		ValidationLLM:             ValidationLLMConfig{},
+		ValidationMaxPromptTokens: DefaultValidationMaxPromptTokens,
+		MaxSectionTokens:          DefaultMaxSectionTokens,
+		MinSectionTokens:          DefaultMinSectionTokens,
+		TargetSections:            nil,
+		Thresholds: ConfidenceThresholds{
+			Glossary:   DefaultConfidenceThreshold,
+			Grammar:    DefaultConfidenceThreshold,
+			Homophones: DefaultConfidenceThreshold,
+			SpokenWord: DefaultConfidenceThreshold,
+		},
+		Normalization: NormalizationConfig{
+			MaxSegmentGap:      DefaultNormalizeMaxSegmentGap,
+			EllipsisGap:        DefaultNormalizeEllipsisGap,
+			MaxSegmentDuration: DefaultNormalizeMaxSegmentDuration,
+			MaxSegmentTokens:   DefaultNormalizeMaxSegmentTokens,
+		},
+		WorkDir:          DefaultWorkDir,
+		WorkDirRetention: DefaultWorkDirRetention,
+	}
+}
+
+func ParseModulesCSV(raw string) ([]string, error) {
+	parts := strings.Split(raw, ",")
+	modules := make([]string, 0, len(parts))
+	for _, part := range parts {
+		trimmed := strings.TrimSpace(part)
+		if trimmed == "" {
+			return nil, fmt.Errorf("modules list contains an empty value")
+		}
+		modules = append(modules, trimmed)
+	}
+	if len(modules) == 0 {
+		return nil, fmt.Errorf("modules list must not be empty")
+	}
+	return modules, nil
+}
+
+func (c Config) EffectiveValidationLLMConfig() LLMConfig {
+	effective := c.PrimaryLLM
+
+	if c.ValidationLLM.APIKey != "" {
+		effective.APIKey = c.ValidationLLM.APIKey
+	}
+	if c.ValidationLLM.Model != "" {
+		effective.Model = c.ValidationLLM.Model
+	}
+	if c.ValidationLLM.BaseURL != "" {
+		effective.BaseURL = c.ValidationLLM.BaseURL
+	}
+	if c.ValidationLLM.TimeoutSeconds != nil {
+		effective.TimeoutSeconds = *c.ValidationLLM.TimeoutSeconds
+	}
+	if c.ValidationLLM.MaxRetries != nil {
+		effective.MaxRetries = *c.ValidationLLM.MaxRetries
+	}
+
+	return effective
+}