package commands

import (
	"encoding/json"
	"errors"
	"io"
	"os"

	"github.com/golangci/golangci-lint/pkg/printers"
	"github.com/golangci/golangci-lint/pkg/report"
	"github.com/golangci/golangci-lint/pkg/result"
)

var ErrNoResult = errors.New("could not read result")

func ReadResultsFile(filePath string) (report *report.Data, issues []result.Issue, err error) {
	if filePath == "" {
		return nil, nil, ErrNoResult
	}

	f, err := os.Open(filePath)
	if err != nil {
		return nil, nil, err
	}

	defer func() {
		err = errors.Join(err, f.Close())
	}()

	return ReadResults(f)
}

func ReadResults(reader io.Reader) (*report.Data, []result.Issue, error) {
	decoder := json.NewDecoder(reader)
	var printerResult printers.JSONResult
	if err := decoder.Decode(&printerResult); err != nil {
		return nil, nil, err
	}

	return printerResult.Report, printerResult.Issues, nil
}