package mirclike

import (
	"errors"
	"strings"
	"time"

	"git.aiterp.net/rpdata/api/models"
)

// ErrEmptyLog is returned by ParseLog if there are no (valid) posts in the log.
var ErrEmptyLog = errors.New("No valid posts found in log")

// ParseLog parses the log and returns the things that can be gleamed from them.
func ParseLog(data string, date time.Time, strict bool) (models.Log, []models.Post, error) {
	lines := strings.Split(data, "\n")
	posts := make([]models.Post, 0, len(lines))
	prev := models.Post{}

	for _, line := range lines {
		line = strings.Trim(line, "\r\t  ")
		if len(line) < 1 {
			continue
		}

		post, err := ParsePost(line, date, prev)
		if err != nil {
			if strict {
				return models.Log{}, nil, err
			}

			continue
		}

		posts = append(posts, post)
		prev = post
	}

	if len(posts) == 0 {
		return models.Log{}, nil, ErrEmptyLog
	}

	log := models.Log{
		Date: posts[0].Time,
	}

	return log, posts, nil
}