feat: add knowledgeHub api

backend/internal/api/api.go

@@ -22,10 +22,11 @@ type api struct {
 	logger     *slog.Logger
 	httpClient *http.Client
 
-	userRepo  domain.UserRepository
-	cropRepo  domain.CroplandRepository
-	farmRepo  domain.FarmRepository
-	plantRepo domain.PlantRepository
+	userRepo         domain.UserRepository
+	cropRepo         domain.CroplandRepository
+	farmRepo         domain.FarmRepository
+	plantRepo        domain.PlantRepository
+	knowledgeHubRepo domain.KnowledgeHubRepository
 }
 
 func NewAPI(ctx context.Context, logger *slog.Logger, pool *pgxpool.Pool) *api {
@@ -36,15 +37,17 @@ func NewAPI(ctx context.Context, logger *slog.Logger, pool *pgxpool.Pool) *api {
 	croplandRepository := repository.NewPostgresCropland(pool)
 	farmRepository := repository.NewPostgresFarm(pool)
 	plantRepository := repository.NewPostgresPlant(pool)
+	knowledgeHubRepository := repository.NewPostgresKnowledgeHub(pool)
 
 	return &api{
 		logger:     logger,
 		httpClient: client,
 
-		userRepo:  userRepository,
-		cropRepo:  croplandRepository,
-		farmRepo:  farmRepository,
-		plantRepo: plantRepository,
+		userRepo:         userRepository,
+		cropRepo:         croplandRepository,
+		farmRepo:         farmRepository,
+		plantRepo:        plantRepository,
+		knowledgeHubRepo: knowledgeHubRepository,
 	}
 }
 
@@ -77,6 +80,7 @@ func (a *api) Routes() *chi.Mux {
 		a.registerCropRoutes(r, api)
 		a.registerPlantRoutes(r, api)
 		a.registerOauthRoutes(r, api)
+		a.registerKnowledgeHubRoutes(r, api)
 	})
 
 	router.Group(func(r chi.Router) {

backend/internal/api/knowledgeHub.go

@@ -0,0 +1,253 @@
+package api
+
+import (
+	"context"
+	"errors"
+	"net/http"
+	"time"
+
+	"github.com/danielgtaylor/huma/v2"
+	"github.com/forfarm/backend/internal/domain"
+	"github.com/go-chi/chi/v5"
+	"github.com/gofrs/uuid"
+)
+
+func (a *api) registerKnowledgeHubRoutes(_ chi.Router, api huma.API) {
+	tags := []string{"knowledge-hub"}
+
+	prefix := "/knowledge-hub"
+
+	huma.Register(api, huma.Operation{
+		OperationID: "getAllKnowledgeArticles",
+		Method:      http.MethodGet,
+		Path:        prefix,
+		Tags:        tags,
+	}, a.getAllKnowledgeArticlesHandler)
+
+	huma.Register(api, huma.Operation{
+		OperationID: "getKnowledgeArticleByID",
+		Method:      http.MethodGet,
+		Path:        prefix + "/{uuid}",
+		Tags:        tags,
+	}, a.getKnowledgeArticleByIDHandler)
+
+	huma.Register(api, huma.Operation{
+		OperationID: "getKnowledgeArticlesByCategory",
+		Method:      http.MethodGet,
+		Path:        prefix + "/category/{category}",
+		Tags:        tags,
+	}, a.getKnowledgeArticlesByCategoryHandler)
+
+	huma.Register(api, huma.Operation{
+		OperationID: "createOrUpdateKnowledgeArticle",
+		Method:      http.MethodPost,
+		Path:        prefix,
+		Tags:        tags,
+	}, a.createOrUpdateKnowledgeArticleHandler)
+
+	huma.Register(api, huma.Operation{
+		OperationID: "getArticleTableOfContents",
+		Method:      http.MethodGet,
+		Path:        prefix + "/{uuid}/toc",
+		Tags:        tags,
+	}, a.getArticleTableOfContentsHandler)
+
+	huma.Register(api, huma.Operation{
+		OperationID: "getArticleRelatedArticles",
+		Method:      http.MethodGet,
+		Path:        prefix + "/{uuid}/related",
+		Tags:        tags,
+	}, a.getArticleRelatedArticlesHandler)
+}
+
+type GetKnowledgeArticlesOutput struct {
+	Body struct {
+		Articles []domain.KnowledgeArticle `json:"articles"`
+	} `json:"body"`
+}
+
+type GetKnowledgeArticleByIDOutput struct {
+	Body struct {
+		Article domain.KnowledgeArticle `json:"article"`
+	} `json:"body"`
+}
+
+type CreateOrUpdateKnowledgeArticleInput struct {
+	Body struct {
+		UUID        string    `json:"uuid,omitempty"` // Optional for create, required for update
+		Title       string    `json:"title"`
+		Content     string    `json:"content"`
+		Author      string    `json:"author"`
+		PublishDate time.Time `json:"publish_date"`
+		ReadTime    string    `json:"read_time"`
+		Categories  []string  `json:"categories"`
+	} `json:"body"`
+}
+
+type CreateOrUpdateKnowledgeArticleOutput struct {
+	Body struct {
+		Article domain.KnowledgeArticle `json:"article"`
+	} `json:"body"`
+}
+
+type GetTableOfContentsOutput struct {
+	Body struct {
+		TableOfContents []domain.TableOfContent `json:"table_of_contents"`
+	} `json:"body"`
+}
+
+type GetRelatedArticlesOutput struct {
+	Body struct {
+		RelatedArticles []domain.RelatedArticle `json:"related_articles"`
+	} `json:"body"`
+}
+
+func (a *api) getAllKnowledgeArticlesHandler(ctx context.Context, input *struct{}) (*GetKnowledgeArticlesOutput, error) {
+	resp := &GetKnowledgeArticlesOutput{}
+
+	articles, err := a.knowledgeHubRepo.GetAllArticles(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	resp.Body.Articles = articles
+	return resp, nil
+}
+
+func (a *api) getKnowledgeArticleByIDHandler(ctx context.Context, input *struct {
+	UUID string `path:"uuid" example:"550e8400-e29b-41d4-a716-446655440000"`
+}) (*GetKnowledgeArticleByIDOutput, error) {
+	resp := &GetKnowledgeArticleByIDOutput{}
+
+	if input.UUID == "" {
+		return nil, huma.Error400BadRequest("UUID parameter is required")
+	}
+
+	_, err := uuid.FromString(input.UUID)
+	if err != nil {
+		return nil, huma.Error400BadRequest("invalid UUID format")
+	}
+
+	article, err := a.knowledgeHubRepo.GetArticleByID(ctx, input.UUID)
+	if err != nil {
+		if errors.Is(err, domain.ErrNotFound) {
+			return nil, huma.Error404NotFound("article not found")
+		}
+		return nil, err
+	}
+
+	resp.Body.Article = article
+	return resp, nil
+}
+
+func (a *api) getKnowledgeArticlesByCategoryHandler(ctx context.Context, input *struct {
+	Category string `path:"category" example:"Sustainability"`
+}) (*GetKnowledgeArticlesOutput, error) {
+	resp := &GetKnowledgeArticlesOutput{}
+
+	if input.Category == "" {
+		return nil, huma.Error400BadRequest("category parameter is required")
+	}
+
+	articles, err := a.knowledgeHubRepo.GetArticlesByCategory(ctx, input.Category)
+	if err != nil {
+		return nil, err
+	}
+
+	resp.Body.Articles = articles
+	return resp, nil
+}
+
+func (a *api) createOrUpdateKnowledgeArticleHandler(ctx context.Context, input *CreateOrUpdateKnowledgeArticleInput) (*CreateOrUpdateKnowledgeArticleOutput, error) {
+	resp := &CreateOrUpdateKnowledgeArticleOutput{}
+
+	if input.Body.Title == "" {
+		return nil, huma.Error400BadRequest("title is required")
+	}
+	if input.Body.Content == "" {
+		return nil, huma.Error400BadRequest("content is required")
+	}
+	if input.Body.Author == "" {
+		return nil, huma.Error400BadRequest("author is required")
+	}
+	if len(input.Body.Categories) == 0 {
+		return nil, huma.Error400BadRequest("at least one category is required")
+	}
+
+	if input.Body.UUID != "" {
+		_, err := uuid.FromString(input.Body.UUID)
+		if err != nil {
+			return nil, huma.Error400BadRequest("invalid UUID format")
+		}
+	}
+
+	article := &domain.KnowledgeArticle{
+		UUID:        input.Body.UUID,
+		Title:       input.Body.Title,
+		Content:     input.Body.Content,
+		Author:      input.Body.Author,
+		PublishDate: input.Body.PublishDate,
+		ReadTime:    input.Body.ReadTime,
+		Categories:  input.Body.Categories,
+	}
+
+	err := a.knowledgeHubRepo.CreateOrUpdateArticle(ctx, article)
+	if err != nil {
+		return nil, err
+	}
+
+	resp.Body.Article = *article
+	return resp, nil
+}
+
+func (a *api) getArticleTableOfContentsHandler(ctx context.Context, input *struct {
+	UUID string `path:"uuid" example:"550e8400-e29b-41d4-a716-446655440000"`
+}) (*GetTableOfContentsOutput, error) {
+	resp := &GetTableOfContentsOutput{}
+
+	if input.UUID == "" {
+		return nil, huma.Error400BadRequest("UUID parameter is required")
+	}
+
+	_, err := uuid.FromString(input.UUID)
+	if err != nil {
+		return nil, huma.Error400BadRequest("invalid UUID format")
+	}
+
+	toc, err := a.knowledgeHubRepo.GetTableOfContents(ctx, input.UUID)
+	if err != nil {
+		if errors.Is(err, domain.ErrNotFound) {
+			return nil, huma.Error404NotFound("article not found")
+		}
+		return nil, err
+	}
+
+	resp.Body.TableOfContents = toc
+	return resp, nil
+}
+
+func (a *api) getArticleRelatedArticlesHandler(ctx context.Context, input *struct {
+	UUID string `path:"uuid" example:"550e8400-e29b-41d4-a716-446655440000"`
+}) (*GetRelatedArticlesOutput, error) {
+	resp := &GetRelatedArticlesOutput{}
+
+	if input.UUID == "" {
+		return nil, huma.Error400BadRequest("UUID parameter is required")
+	}
+
+	_, err := uuid.FromString(input.UUID)
+	if err != nil {
+		return nil, huma.Error400BadRequest("invalid UUID format")
+	}
+
+	related, err := a.knowledgeHubRepo.GetRelatedArticles(ctx, input.UUID)
+	if err != nil {
+		if errors.Is(err, domain.ErrNotFound) {
+			return nil, huma.Error404NotFound("article not found")
+		}
+		return nil, err
+	}
+
+	resp.Body.RelatedArticles = related
+	return resp, nil
+}