gitcaddy-server/models/blog/blog_post.go

// Copyright 2026 MarketAlly. All rights reserved.
// SPDX-License-Identifier: MIT

package blog

import (
	"context"
	"fmt"
	"sort"
	"strings"

	"code.gitcaddy.com/server/v3/models/db"
	repo_model "code.gitcaddy.com/server/v3/models/repo"
	"code.gitcaddy.com/server/v3/models/unit"
	user_model "code.gitcaddy.com/server/v3/models/user"
	"code.gitcaddy.com/server/v3/modules/timeutil"

	"xorm.io/xorm"
)

// BlogPostStatus represents the publication state of a blog post.
type BlogPostStatus int //revive:disable-line:exported

const (
	BlogPostDraft     BlogPostStatus = 0
	BlogPostPublic    BlogPostStatus = 1
	BlogPostPublished BlogPostStatus = 2
)

// String returns a human-readable label for the blog post status.
func (s BlogPostStatus) String() string {
	switch s {
	case BlogPostDraft:
		return "draft"
	case BlogPostPublic:
		return "public"
	case BlogPostPublished:
		return "published"
	default:
		return "unknown"
	}
}

// BlogPost represents a blog article belonging to a repository.
type BlogPost struct { //revive:disable-line:exported
	ID               int64              `xorm:"pk autoincr"`
	RepoID           int64              `xorm:"INDEX NOT NULL"`
	AuthorID         int64              `xorm:"INDEX NOT NULL"`
	Title            string             `xorm:"VARCHAR(255) NOT NULL"`
	Subtitle         string             `xorm:"VARCHAR(500)"`
	Content          string             `xorm:"LONGTEXT NOT NULL"`
	RenderedContent  string             `xorm:"-"`
	Tags             string             `xorm:"TEXT"`
	Series           string             `xorm:"VARCHAR(255)"`
	FeaturedImageID  int64              `xorm:"DEFAULT 0"`
	Status           BlogPostStatus     `xorm:"SMALLINT NOT NULL DEFAULT 0"`
	AllowComments    bool               `xorm:"NOT NULL DEFAULT true"`
	SubscriptionOnly bool               `xorm:"NOT NULL DEFAULT false"`
	PublishedUnix    timeutil.TimeStamp `xorm:"INDEX"`
	CreatedUnix      timeutil.TimeStamp `xorm:"INDEX created"`
	UpdatedUnix      timeutil.TimeStamp `xorm:"INDEX updated"`

	Author        *user_model.User       `xorm:"-"`
	Repo          *repo_model.Repository `xorm:"-"`
	FeaturedImage *repo_model.Attachment `xorm:"-"`
}

func init() {
	db.RegisterModel(new(BlogPost))
}

// LoadAuthor loads the author user for a blog post.
func (p *BlogPost) LoadAuthor(ctx context.Context) error {
	if p.Author != nil {
		return nil
	}
	u, err := user_model.GetUserByID(ctx, p.AuthorID)
	if err != nil {
		return err
	}
	p.Author = u
	return nil
}

// LoadRepo loads the repository for a blog post.
func (p *BlogPost) LoadRepo(ctx context.Context) error {
	if p.Repo != nil {
		return nil
	}
	r, err := repo_model.GetRepositoryByID(ctx, p.RepoID)
	if err != nil {
		return err
	}
	p.Repo = r
	return nil
}

// LoadFeaturedImage loads the featured image attachment.
func (p *BlogPost) LoadFeaturedImage(ctx context.Context) error {
	if p.FeaturedImage != nil || p.FeaturedImageID == 0 {
		return nil
	}
	a, err := repo_model.GetAttachmentByID(ctx, p.FeaturedImageID)
	if err != nil {
		return err
	}
	p.FeaturedImage = a
	return nil
}

// BlogPostSearchOptions contains filters for querying blog posts.
type BlogPostSearchOptions struct { //revive:disable-line:exported
	RepoID          int64
	AuthorID        int64
	Status          BlogPostStatus
	AnyPublicStatus bool // if true, matches Public OR Published
	Keyword         string
	Tag             string
	Page            int
	PageSize        int
}

// GetBlogPostByID returns a single blog post by ID.
func GetBlogPostByID(ctx context.Context, id int64) (*BlogPost, error) {
	p := &BlogPost{}
	has, err := db.GetEngine(ctx).ID(id).Get(p)
	if err != nil {
		return nil, err
	}
	if !has {
		return nil, fmt.Errorf("blog post %d not found", id)
	}
	return p, nil
}

// GetBlogPostsByRepoID returns blog posts for a repo with filters and pagination.
func GetBlogPostsByRepoID(ctx context.Context, opts *BlogPostSearchOptions) ([]*BlogPost, int64, error) {
	sess := db.GetEngine(ctx).Where("repo_id = ?", opts.RepoID)

	if opts.AnyPublicStatus {
		sess = sess.And("status >= ?", BlogPostPublic)
	} else if opts.Status >= 0 {
		sess = sess.And("status = ?", opts.Status)
	}

	if opts.Keyword != "" {
		sess = sess.And("(LOWER(title) LIKE ? OR LOWER(subtitle) LIKE ?)",
			"%"+strings.ToLower(opts.Keyword)+"%",
			"%"+strings.ToLower(opts.Keyword)+"%")
	}

	if opts.Tag != "" {
		// Match tag in comma-separated list
		sess = sess.And("(tags LIKE ? OR tags LIKE ? OR tags LIKE ? OR tags = ?)",
			opts.Tag+",%", "%,"+opts.Tag+",%", "%,"+opts.Tag, opts.Tag)
	}

	count, err := sess.Count(new(BlogPost))
	if err != nil {
		return nil, 0, err
	}

	// Re-create session for find (xorm reuses conditions)
	sess = db.GetEngine(ctx).Where("repo_id = ?", opts.RepoID)
	if opts.AnyPublicStatus {
		sess = sess.And("status >= ?", BlogPostPublic)
	} else if opts.Status >= 0 {
		sess = sess.And("status = ?", opts.Status)
	}

	if opts.Keyword != "" {
		sess = sess.And("(LOWER(title) LIKE ? OR LOWER(subtitle) LIKE ?)",
			"%"+strings.ToLower(opts.Keyword)+"%",
			"%"+strings.ToLower(opts.Keyword)+"%")
	}

	if opts.Tag != "" {
		sess = sess.And("(tags LIKE ? OR tags LIKE ? OR tags LIKE ? OR tags = ?)",
			opts.Tag+",%", "%,"+opts.Tag+",%", "%,"+opts.Tag, opts.Tag)
	}

	pageSize := opts.PageSize
	if pageSize <= 0 {
		pageSize = 20
	}
	page := opts.Page
	if page <= 0 {
		page = 1
	}

	posts := make([]*BlogPost, 0, pageSize)
	err = sess.OrderBy("created_unix DESC").
		Limit(pageSize, (page-1)*pageSize).
		Find(&posts)
	return posts, count, err
}

// GetPublishedBlogPosts returns published blog posts across all repos.
func GetPublishedBlogPosts(ctx context.Context, page, pageSize int) ([]*BlogPost, int64, error) {
	if pageSize <= 0 {
		pageSize = 20
	}
	if page <= 0 {
		page = 1
	}

	count, err := db.GetEngine(ctx).Where("status = ?", BlogPostPublished).Count(new(BlogPost))
	if err != nil {
		return nil, 0, err
	}

	posts := make([]*BlogPost, 0, pageSize)
	err = db.GetEngine(ctx).Where("status = ?", BlogPostPublished).
		OrderBy("published_unix DESC").
		Limit(pageSize, (page-1)*pageSize).
		Find(&posts)
	return posts, count, err
}

// ExploreBlogPostsOptions configures the explore blogs query.
type ExploreBlogPostsOptions struct {
	Actor    *user_model.User
	Page     int
	PageSize int
	SortType string // "newest" (default) or "popular"
	Keyword  string // search in title/subtitle
	Tag      string // filter by tag (exact match within comma-separated tags)
	Series   string // filter by series name (exact match)
}

// exploreBlogBaseSess creates a base session with blog status and repo access conditions.
func exploreBlogBaseSess(ctx context.Context, actor *user_model.User) *xorm.Session {
	repoCond := repo_model.AccessibleRepositoryCondition(actor, unit.TypeInvalid)
	return db.GetEngine(ctx).
		Table("blog_post").
		Join("INNER", "`repository`", "`blog_post`.repo_id = `repository`.id").
		Where("blog_post.status >= ?", BlogPostPublic).
		And(repoCond)
}

// GetExploreBlogPosts returns published/public blog posts visible to the actor,
// filtered by repository access permissions.
func GetExploreBlogPosts(ctx context.Context, opts *ExploreBlogPostsOptions) ([]*BlogPost, int64, error) {
	if opts.PageSize <= 0 {
		opts.PageSize = 20
	}
	if opts.Page <= 0 {
		opts.Page = 1
	}

	countSess := exploreBlogBaseSess(ctx, opts.Actor)
	findSess := exploreBlogBaseSess(ctx, opts.Actor)

	if opts.Keyword != "" {
		kw := "%" + opts.Keyword + "%"
		countSess = countSess.And("(blog_post.title LIKE ? OR blog_post.subtitle LIKE ?)", kw, kw)
		findSess = findSess.And("(blog_post.title LIKE ? OR blog_post.subtitle LIKE ?)", kw, kw)
	}

	if opts.Tag != "" {
		// Match tag within comma-separated list: exact match, or starts with, ends with, or in middle
		tagPattern := "%" + opts.Tag + "%"
		countSess = countSess.And("blog_post.tags LIKE ?", tagPattern)
		findSess = findSess.And("blog_post.tags LIKE ?", tagPattern)
	}

	if opts.Series != "" {
		countSess = countSess.And("blog_post.series = ?", opts.Series)
		findSess = findSess.And("blog_post.series = ?", opts.Series)
	}

	count, err := countSess.Count(new(BlogPost))
	if err != nil {
		return nil, 0, err
	}

	switch opts.SortType {
	case "popular":
		findSess = findSess.OrderBy(
			"(SELECT COUNT(*) FROM blog_reaction WHERE blog_reaction.blog_post_id = blog_post.id AND blog_reaction.is_like = ?) DESC, blog_post.published_unix DESC",
			true,
		)
	default: // "newest"
		findSess = findSess.OrderBy("blog_post.published_unix DESC")
	}

	posts := make([]*BlogPost, 0, opts.PageSize)
	err = findSess.
		Limit(opts.PageSize, (opts.Page-1)*opts.PageSize).
		Find(&posts)
	return posts, count, err
}

// TagCount represents a tag name and its usage count.
type TagCount struct {
	Tag   string
	Count int
}

// GetExploreTopTags returns the top N tags across all accessible published blog posts.
func GetExploreTopTags(ctx context.Context, actor *user_model.User, limit int) ([]*TagCount, error) {
	// Fetch all tags from accessible posts
	type tagRow struct {
		Tags string `xorm:"tags"`
	}
	var rows []tagRow
	err := exploreBlogBaseSess(ctx, actor).
		Cols("blog_post.tags").
		Where("blog_post.tags != ''").
		Find(&rows)
	if err != nil {
		return nil, err
	}

	// Aggregate tag counts
	counts := make(map[string]int)
	for _, r := range rows {
		for t := range strings.SplitSeq(r.Tags, ",") {
			t = strings.TrimSpace(t)
			if t != "" {
				counts[t]++
			}
		}
	}

	// Sort by count descending
	result := make([]*TagCount, 0, len(counts))
	for tag, c := range counts {
		result = append(result, &TagCount{Tag: tag, Count: c})
	}
	sort.Slice(result, func(i, j int) bool {
		if result[i].Count != result[j].Count {
			return result[i].Count > result[j].Count
		}
		return result[i].Tag < result[j].Tag
	})

	if limit > 0 && len(result) > limit {
		result = result[:limit]
	}
	return result, nil
}

// GetRepoTopTags returns the top N tags for a specific repo's published blog posts.
func GetRepoTopTags(ctx context.Context, repoID int64, limit int) ([]*TagCount, error) {
	type tagRow struct {
		Tags string `xorm:"tags"`
	}
	var rows []tagRow
	err := db.GetEngine(ctx).Table("blog_post").
		Cols("tags").
		Where("repo_id = ? AND status >= ? AND tags != ''", repoID, BlogPostPublic).
		Find(&rows)
	if err != nil {
		return nil, err
	}

	// Aggregate tag counts
	counts := make(map[string]int)
	for _, r := range rows {
		for t := range strings.SplitSeq(r.Tags, ",") {
			t = strings.TrimSpace(t)
			if t != "" {
				counts[t]++
			}
		}
	}

	// Sort by count descending
	result := make([]*TagCount, 0, len(counts))
	for tag, c := range counts {
		result = append(result, &TagCount{Tag: tag, Count: c})
	}
	sort.Slice(result, func(i, j int) bool {
		if result[i].Count != result[j].Count {
			return result[i].Count > result[j].Count
		}
		return result[i].Tag < result[j].Tag
	})

	if limit > 0 && len(result) > limit {
		result = result[:limit]
	}
	return result, nil
}

// CountPublicBlogPosts returns the total number of public/published blog posts across all repos.
func CountPublicBlogPosts(ctx context.Context) (int64, error) {
	return db.GetEngine(ctx).Where("status >= ?", BlogPostPublic).Count(new(BlogPost))
}

// GetPublicBlogPostsPage returns a page of public/published blog posts for sitemap generation.
func GetPublicBlogPostsPage(ctx context.Context, page, pageSize int) ([]*BlogPost, error) {
	if pageSize <= 0 {
		pageSize = 20
	}
	if page <= 0 {
		page = 1
	}
	posts := make([]*BlogPost, 0, pageSize)
	err := db.GetEngine(ctx).Where("status >= ?", BlogPostPublic).
		OrderBy("id ASC").
		Limit(pageSize, (page-1)*pageSize).
		Find(&posts)
	return posts, err
}

// CountPublishedBlogsByRepoID returns the count of published/public blog posts for a repo.
func CountPublishedBlogsByRepoID(ctx context.Context, repoID int64) (int64, error) {
	return db.GetEngine(ctx).Where("repo_id = ? AND status >= ?", repoID, BlogPostPublic).Count(new(BlogPost))
}

// CreateBlogPost inserts a new blog post.
func CreateBlogPost(ctx context.Context, p *BlogPost) error {
	_, err := db.GetEngine(ctx).Insert(p)
	return err
}

// UpdateBlogPost updates an existing blog post.
func UpdateBlogPost(ctx context.Context, p *BlogPost) error {
	_, err := db.GetEngine(ctx).ID(p.ID).AllCols().Update(p)
	return err
}

// DeleteBlogPost removes a blog post by ID.
func DeleteBlogPost(ctx context.Context, id int64) error {
	_, err := db.GetEngine(ctx).ID(id).Delete(new(BlogPost))
	return err
}

// CountPublishedBlogPostsByAuthorID returns the number of published/public blog posts by a user.
func CountPublishedBlogPostsByAuthorID(ctx context.Context, authorID int64) (int64, error) {
	return db.GetEngine(ctx).Where("author_id = ? AND status >= ?", authorID, BlogPostPublic).Count(new(BlogPost))
}

// GetPublishedBlogPostsByAuthorID returns published/public blog posts by a user, ordered by published date descending.
func GetPublishedBlogPostsByAuthorID(ctx context.Context, authorID int64, page, pageSize int) ([]*BlogPost, int64, error) {
	if pageSize <= 0 {
		pageSize = 20
	}
	if page <= 0 {
		page = 1
	}

	cond := "author_id = ? AND status >= ?"

	count, err := db.GetEngine(ctx).Where(cond, authorID, BlogPostPublic).Count(new(BlogPost))
	if err != nil {
		return nil, 0, err
	}

	posts := make([]*BlogPost, 0, pageSize)
	err = db.GetEngine(ctx).Where(cond, authorID, BlogPostPublic).
		OrderBy("published_unix DESC").
		Limit(pageSize, (page-1)*pageSize).
		Find(&posts)
	return posts, count, err
}