package format

import (
	"fmt"
	"strings"

	"edge-infra.dev/pkg/edge/api/graph/model"
)

type actionType int

const (
	applyAction actionType = iota
	deleteAction
)

// GenerateDeleteOutput creates a formatted string for displaying deletion
// errors to the user
func GenerateDeleteOutput(inputType string, errors []*model.OperatorInterventionErrorResponse) string {
	return generateOutput(deleteAction, inputType, errors)
}

// GenerateApplyOutput creates a formatted string for displaying errors that
// occur during create and update mutations to the user
func GenerateApplyOutput(inputType string, errors []*model.OperatorInterventionErrorResponse) string {
	return generateOutput(applyAction, inputType, errors)
}

func generateOutput(action actionType, inputType string, errors []*model.OperatorInterventionErrorResponse) string {
	var pastAction string
	var presentAction string
	switch action {
	case applyAction:
		pastAction = "applied"
		presentAction = "applying"
	case deleteAction:
		pastAction = "deleted"
		presentAction = "deleting"
	}

	if len(errors) == 0 {
		return fmt.Sprintf("\nOI %s %s\n", inputType, pastAction)
	}

	var sb strings.Builder

	sb.WriteString(fmt.Sprintf("\nErrors occurred when %s OI %s: \n", presentAction, inputType))

	for _, e := range errors {
		sb.WriteString(formatError(e))
		sb.WriteString("\n")
	}

	sb.WriteString(fmt.Sprintf("\nOI %s not %s.\n", inputType, pastAction))

	return sb.String()
}

// generates an error message string corresponding to the particular error
func formatError(e *model.OperatorInterventionErrorResponse) string {
	resp := fmt.Sprintf("\tError: %s", e.Type)

	var args []string
	if e.Role != nil {
		args = append(args, fmt.Sprintf("Role: %q", *e.Role))
	}
	if e.Privilege != nil {
		args = append(args, fmt.Sprintf("Privilege: %q", *e.Privilege))
	}
	if e.Command != nil {
		args = append(args, fmt.Sprintf("Command: %q", *e.Command))
	}

	if len(args) != 0 {
		resp = fmt.Sprintf("%s. Details: ", resp)
	}

	resp = fmt.Sprintf("%s%s", resp, strings.Join(args, ", "))

	return resp
}