package invoice

import (
	"io"

	"code.gitea.io/sdk/gitea"
	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/issue"
	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/model"
	"git.schreifuchs.ch/lou-taylor/accounting/pkg/invoice/report"
)

func (s *Service) Generate(creditor model.Entity, debtor *model.Entity, rate float64, repos []Repo, config *Options) (document io.ReadCloser, r report.Report, err error) {
	if config == nil {
		config = &DefaultOptions
	}
	var is []*gitea.Issue
	for _, repo := range repos {
		iss, _, err := s.gitea.ListRepoIssues(
			repo.Owner,
			repo.Repo,
			gitea.ListIssueOption{
				ListOptions: gitea.ListOptions{Page: 0, PageSize: 99999},
				Since:       config.Since,
				Before:      config.Before,
				State:       config.IssueState,
			},
		)
		if err != nil {
			return nil, r, err
		}

		is = append(is, iss...)
	}

	{
		issueURLs := make([]string, 0, len(is))
		for _, issue := range is {
			issueURLs = append(issueURLs, issue.HTMLURL)
		}
		s.log.Debug("loaded all issues", "issueURLs", issueURLs)
	}

	is = s.filterIssues(is, config.IssueFilter)

	issues := issue.FromGiteas(is, config.Mindur)
	r = report.New(
		issues,
		creditor,
		debtor,
		rate,
	)

	if len(config.CustomTemplate) > 1 {
		r = r.WithTemplate(config.CustomTemplate)
	}
	html, err := r.ToHTML()
	if err != nil {
		return document, r, err
	}

	document, err = s.pdf.HtmlToPdf(html)
	return document, r, err
}

func (s *Service) filterIssues(slice []*gitea.Issue, ok func(*gitea.Issue) bool) []*gitea.Issue {
	out := make([]*gitea.Issue, 0, len(slice))

	for _, issue := range slice {
		if ok(issue) {
			out = append(out, issue)
		} else {
			s.log.Debug("filter out issue", "issueURL", issue.HTMLURL)
		}
	}

	return out
}