package common

import (
	"regexp"
	"slices"
	"strings"

	"src.opensuse.org/autogits/common/gitea-generated/models"
)

type PRReviews struct {
	reviews   []*models.PullReview
	reviewers []string
	comments  []*models.TimelineComment
}

func FetchGiteaReviews(rf GiteaReviewTimelineFetcher, reviewers []string, org, repo string, no int64) (*PRReviews, error) {
	timeline, err := rf.GetTimeline(org, repo, no)
	if err != nil {
		return nil, err
	}

	rawReviews, err := rf.GetPullRequestReviews(org, repo, no)
	if err != nil {
		return nil, err
	}

	reviews := make([]*models.PullReview, 0, 10)
	var comments []*models.TimelineComment

	for idx, item := range timeline {
		if item.Type == TimelineCommentType_Review {
			for _, r := range rawReviews {
				if r.ID == item.ReviewID {
					reviews = append(reviews, r)
					break
				}
			}
		} else if item.Type == TimelineCommentType_Comment {
			comments = append(comments, item)
		} else if item.Type == TimelineCommentType_PushPull {
			timeline = timeline[0:idx]
			break
		} else {
			LogDebug("Unhandled timeline type:", item.Type)
		}
	}

	return &PRReviews{
		reviews:   reviews,
		reviewers: reviewers,
		comments:  comments,
	}, nil
}

const ManualMergeOK = "^merge\\s+ok(\\W|$)"

var merge_ok_regex *regexp.Regexp = regexp.MustCompile(ManualMergeOK)

func bodyCommandManualMergeOK(body string) bool {
	lines := SplitLines(body)
	for _, line := range lines {
		if merge_ok_regex.MatchString(strings.ToLower(line)) {
			return true
		}
	}
	return false
}

func (r *PRReviews) IsManualMergeOK() bool {
	for _, c := range r.comments {
		if c.Updated != c.Created {
			continue
		}
		if slices.Contains(r.reviewers, c.User.UserName) {
			if bodyCommandManualMergeOK(c.Body) {
				return true
			}
		}
	}

	for _, c := range r.reviews {
		if c.Updated != c.Submitted {
			continue
		}
		if slices.Contains(r.reviewers, c.User.UserName) {
			if bodyCommandManualMergeOK(c.Body) {
				return true
			}
		}
	}

	return false
}

func (r *PRReviews) IsApproved() bool {
	goodReview := true

	for _, reviewer := range r.reviewers {
		goodReview = false
		for _, review := range r.reviews {
			if review.User.UserName == reviewer && review.State == ReviewStateApproved && !review.Stale && !review.Dismissed {
				LogDebug("  -- found review: ", review.User.UserName)
				goodReview = true
				break
			}
		}

		if !goodReview {
			break
		}
	}

	return goodReview
}

func (r *PRReviews) HasPendingReviewBy(reviewer string) bool {
	if !slices.Contains(r.reviewers, reviewer) {
		return false
	}

	isPending := false
	for _, r := range r.reviews {
		if r.User.UserName == reviewer && !r.Stale {
			switch r.State {
			case ReviewStateApproved:
				fallthrough
			case ReviewStateRequestChanges:
				return false
			case ReviewStateRequestReview:
				fallthrough
			case ReviewStatePending:
				isPending = true
			}
		}
	}

	return isPending
}

func (r *PRReviews) IsReviewedBy(reviewer string) bool {
	if !slices.Contains(r.reviewers, reviewer) {
		return false
	}

	for _, r := range r.reviews {
		if r.User.UserName == reviewer && !r.Stale {
			switch r.State {
			case ReviewStateApproved:
				return true
			case ReviewStateRequestChanges:
				return true
			}
		}
	}

	return false
}