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()
}