package commitlint

import (
	"bufio"
	"commitlint/internal/commitlint/configuration"
	"commitlint/internal/commitlint/validator"
	"fmt"
	"os"
)

func EntryPoint(pCommitMessagePath *string, pConfigPath *string) error {
	pConfig, err := configuration.CreateConfig(pConfigPath)
	if err != nil {
		return err
	}

	commitMessage, err := ReadCommitMessage(*pCommitMessagePath)
	if err != nil {
		return err
	}

	pResult := validator.Validate(commitMessage, *pConfig)
	if pResult != nil {
		var errMessage string

		switch pResult.Result {
		case validator.IncorrectPattern:
			errMessage = "Incorrect commit message format"
		case validator.UnknownType:
			errMessage = fmt.Sprintf("Unknown commit type '%s'", pResult.UnknownType)
		case validator.UnknownContext:
			errMessage = fmt.Sprintf("Unknown commit context '%s'", pResult.UnknownContext)
		case validator.OverlongLine:
			errMessage = fmt.Sprintf("Line number %d exceeds the allowed length", pResult.Line)
		case validator.BlankLine:
			errMessage = "Use blank line before BODY"
		}

		_, err := fmt.Fprintln(os.Stderr, errMessage)
		return err
	}

	return nil
}

func ReadCommitMessage(path string) ([]string, error) {
	var lines []string

	file, err := os.Open(path)
	if err != nil {
		panic(err)
	}
	defer func(file *os.File) {
		_ = file.Close()
	}(file)

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	return lines, err
}