package taskgraph

import "fmt"

type Status string

const (
	StatusDraft      Status = "draft"
	StatusActive     Status = "active"
	StatusSuperseded Status = "superseded"
	StatusCancelled  Status = "cancelled"
)

type Record struct {
	ID                      string `json:"id"`
	TopicID                 string `json:"topic_id"`
	Version                 int    `json:"version"`
	Status                  Status `json:"status"`
	PlanJSON                string `json:"plan_json"`
	PlanSummaryMarkdown     string `json:"plan_summary_markdown"`
	CreatedByRoleName       string `json:"created_by_role_name"`
	CreatedAt               string `json:"created_at"`
	ConfirmedAt             string `json:"confirmed_at,omitempty"`
	SupersedesGraphVersionID string `json:"supersedes_graph_version_id,omitempty"`
}

func ValidateStatus(value Status) error {
	switch value {
	case StatusDraft, StatusActive, StatusSuperseded, StatusCancelled:
		return nil
	default:
		return fmt.Errorf("invalid task graph status %q", value)
	}
}

func (r Record) Validate() error {
	if r.TopicID == "" {
		return fmt.Errorf("topic id is required")
	}
	if r.Version <= 0 {
		return fmt.Errorf("version must be greater than zero")
	}
	if r.PlanJSON == "" {
		return fmt.Errorf("plan json is required")
	}
	if r.CreatedByRoleName == "" {
		return fmt.Errorf("created by role is required")
	}
	return ValidateStatus(r.Status)
}