package framework

import (
	"errors"
	"fmt"

	"project/internal/domain"
)

func ValidateFramework(fw *domain.InterviewFramework) error {
	if fw == nil {
		return errors.New("framework is nil")
	}

	if fw.Framework.ID == "" {
		return errors.New("framework.id is required")
	}

	if fw.Framework.Name == "" {
		return errors.New("framework.name is required")
	}

	if len(fw.Interview.Sections) == 0 {
		return errors.New("interview.sections must not be empty")
	}

	sectionIDs := map[string]bool{}
	questionIDs := map[string]bool{}

	for _, sec := range fw.Interview.Sections {
		if sec.ID == "" {
			return errors.New("section.id is required")
		}
		if sectionIDs[sec.ID] {
			return fmt.Errorf("duplicate section.id: %s", sec.ID)
		}
		sectionIDs[sec.ID] = true

		if len(sec.Questions) == 0 {
			return fmt.Errorf("section %s must have at least one question", sec.ID)
		}

		for _, q := range sec.Questions {
			if q.ID == "" {
				return fmt.Errorf("question.id required in section %s", sec.ID)
			}
			if questionIDs[q.ID] {
				return fmt.Errorf("duplicate question.id: %s", q.ID)
			}
			questionIDs[q.ID] = true
		}
	}

	return nil
}