feat(companion): add reflection engine, diary system, and dynamic prompt builder

internal/companion/promptbuilder.go

@@ -0,0 +1,78 @@
+package companion
+
+import (
+	"fmt"
+	"strings"
+
+	"git.db123.ir/db123/divacode/internal/config"
+	"git.db123.ir/db123/divacode/pkg/types"
+)
+
+type PromptBuilder struct {
+	cfg *config.Config
+}
+
+func NewPromptBuilder(cfg *config.Config) *PromptBuilder {
+	return &PromptBuilder{cfg: cfg}
+}
+
+func (pb *PromptBuilder) Build(in *BuildInput) string {
+	var b strings.Builder
+
+	b.WriteString("[System]\n")
+	b.WriteString(in.SystemPrompt)
+	b.WriteString("\n\n")
+
+	b.WriteString("### Current Personality\n")
+	for _, t := range in.Traits {
+		label := string(t.Trait)
+		pct := int(t.Value * 100)
+		b.WriteString(fmt.Sprintf("- %s: %d%%\n", label, pct))
+	}
+
+	b.WriteString("\n### Current Mood\n")
+	b.WriteString(string(in.Mood))
+	b.WriteString("\n")
+
+	if in.Relationship != nil && in.Relationship.Familiarity > 0.1 {
+		b.WriteString(fmt.Sprintf("\n### Relationship Context\n"))
+		b.WriteString(fmt.Sprintf("- Familiarity: %d%%\n", int(in.Relationship.Familiarity*100)))
+		b.WriteString(fmt.Sprintf("- Trust: %d%%\n", int(in.Relationship.Trust*100)))
+		if len(in.Relationship.SharedTopics) > 0 {
+			b.WriteString(fmt.Sprintf("- Shared interests: %s\n", strings.Join(in.Relationship.SharedTopics, ", ")))
+		}
+	}
+
+	if len(in.Observations) > 0 {
+		b.WriteString("\n### Recent Observations\n")
+		for _, o := range in.Observations {
+			b.WriteString(fmt.Sprintf("- %s\n", o.Content))
+		}
+	}
+
+	if len(in.Memories) > 0 {
+		b.WriteString("\n### Relevant Memories\n")
+		for i, m := range in.Memories {
+			if i >= 5 {
+				break
+			}
+			b.WriteString(fmt.Sprintf("- %s\n", m))
+		}
+	}
+
+	b.WriteString("\n### Recent Conversation\n")
+	start := 0
+	if len(in.Messages) > 10 {
+		start = len(in.Messages) - 10
+	}
+	for _, msg := range in.Messages[start:] {
+		prefix := "User"
+		if msg.Role == types.RoleAssistant {
+			prefix = "You"
+		}
+		b.WriteString(fmt.Sprintf("%s: %s\n", prefix, msg.Content))
+	}
+
+	b.WriteString("\nYou:")
+	return b.String()
+}