package logic

import (
	"strings"
	"time"

	"img_infinite_canvas/internal/domain/design"
	"img_infinite_canvas/internal/types"
)

func latestLovartThreadID(project design.Project) string {
	if threadID := strings.TrimSpace(project.LastThreadID); threadID != "" {
		return threadID
	}
	for index := len(project.Messages) - 1; index >= 0; index-- {
		message := project.Messages[index]
		if isHiddenAgentMessage(message) {
			continue
		}
		if threadID := strings.TrimSpace(message.ThreadID); threadID != "" {
			return threadID
		}
	}
	return ""
}

func toCandaChatHistoryItem(message design.Message, projectID string, threadID string) types.CandaChatHistoryItem {
	messageType := strings.TrimSpace(message.Type)
	if messageType == "" {
		messageType = strings.TrimSpace(message.Role)
	}
	if messageType == "tool" {
		messageType = "tool_use"
	}
	item := types.CandaChatHistoryItem{
		Id:         message.ID,
		Timestamp:  formatCandaTimestamp(message.CreatedAt),
		Type:       messageType,
		ActionId:   nonEmpty(message.ActionID, threadID),
		StepId:     nonEmpty(message.StepID, message.ID),
		Status:     message.Status,
		ToolCallId: message.ToolCallID,
		Name:       message.Name,
		ThreadMeta: types.CandaThreadMeta{
			ActionId:  nonEmpty(message.ActionID, threadID),
			SessionId: threadID + "_main",
			StepId:    nonEmpty(message.StepID, message.ID),
			Depth:     0,
			AgentName: "next_agent",
			ProjectId: projectID,
		},
	}
	if message.Role == "user" {
		item.Text = message.Content
	} else {
		item.Content = message.Content
		if item.Name == "" {
			item.Name = message.Title
		}
	}
	return item
}

func nonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}

func formatCandaTimestamp(value time.Time) string {
	if value.IsZero() {
		value = time.Now()
	}
	return value.UTC().Format(time.RFC3339Nano)
}