discourse/backend/perspective/handler.go

package perspective

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

// PerspectiveHandler handles HTTP requests for perspectives
type PerspectiveHandler struct {
	service *PerspectiveService
}

// NewPerspectiveHandler creates a new perspective handler
func NewPerspectiveHandler(service *PerspectiveService) *PerspectiveHandler {
	return &PerspectiveHandler{
		service: service,
	}
}

// RegisterRoutes registers the perspective routes
func (h *PerspectiveHandler) RegisterRoutes(router *gin.Engine) {
	perspective := router.Group("/perspective")
	{
		perspective.OPTIONS("/submit", h.handleCORS)
		perspective.POST("/submit", h.HandleSubmitPerspective)
		perspective.GET("/get/:hash", h.HandleGetPerspective)
		perspective.GET("/issue/:issueId", h.HandleGetPerspectivesByIssue)
	}
}

// SubmitPerspectiveRequest represents a request to submit a perspective
type SubmitPerspectiveRequest struct {
	IssueID      string `json:"issueId" binding:"required"`
	Text         string `json:"text" binding:"required"`
	FileURL      string `json:"fileUrl,omitempty"`
	UserAddress  string `json:"userAddress" binding:"required"`
	IsVerified   bool   `json:"isVerified"`
	CaptchaToken string `json:"captchaToken,omitempty"`
}

// PerspectiveResponse represents a response for perspective operations
type PerspectiveResponse struct {
	Success  bool        `json:"success"`
	Message  string      `json:"message"`
	IPFSHash string      `json:"ipfsHash,omitempty"`
	IPFSUrl  string      `json:"ipfsUrl,omitempty"`
	Data     interface{} `json:"data,omitempty"`
}

// handleCORS handles CORS preflight requests
func (h *PerspectiveHandler) handleCORS(c *gin.Context) {
	c.Header("Access-Control-Allow-Origin", "*")
	c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
	c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization")
	c.Status(http.StatusOK)
}

// HandleSubmitPerspective handles perspective submission requests
func (h *PerspectiveHandler) HandleSubmitPerspective(c *gin.Context) {
	c.Header("Access-Control-Allow-Origin", "*")
	c.Header("Access-Control-Allow-Methods", "POST, GET, OPTIONS")
	c.Header("Access-Control-Allow-Headers", "Content-Type, Authorization")

	var request SubmitPerspectiveRequest
	if err := c.ShouldBindJSON(&request); err != nil {
		c.JSON(http.StatusBadRequest, PerspectiveResponse{
			Success: false,
			Message: "Invalid request format",
		})
		return
	}

	ipfsHash, err := h.service.SubmitPerspective(
		c.Request.Context(),
		request.IssueID,
		request.Text,
		request.FileURL,
		request.UserAddress,
		request.IsVerified,
		request.CaptchaToken,
	)

	if err != nil {
		c.JSON(http.StatusBadRequest, PerspectiveResponse{
			Success: false,
			Message: err.Error(),
		})
		return
	}

	// Generate an IPFS gateway URL
	ipfsUrl := h.service.ipfsService.GetIPFSGatewayURL(ipfsHash)

	c.JSON(http.StatusOK, PerspectiveResponse{
		Success:  true,
		Message:  "Perspective submitted successfully",
		IPFSHash: ipfsHash,
		IPFSUrl:  ipfsUrl,
	})
}

// HandleGetPerspective handles perspective retrieval requests
func (h *PerspectiveHandler) HandleGetPerspective(c *gin.Context) {
	c.Header("Access-Control-Allow-Origin", "*")

	ipfsHash := c.Param("hash")
	if ipfsHash == "" {
		c.JSON(http.StatusBadRequest, PerspectiveResponse{
			Success: false,
			Message: "Missing IPFS hash",
		})
		return
	}

	perspective, err := h.service.GetPerspective(ipfsHash)
	if err != nil {
		c.JSON(http.StatusNotFound, PerspectiveResponse{
			Success: false,
			Message: err.Error(),
		})
		return
	}

	ipfsUrl := h.service.ipfsService.GetIPFSGatewayURL(ipfsHash)

	c.JSON(http.StatusOK, PerspectiveResponse{
		Success:  true,
		Message:  "Perspective retrieved successfully",
		IPFSHash: ipfsHash,
		IPFSUrl:  ipfsUrl,
		Data:     perspective,
	})
}

// HandleGetPerspectivesByIssue handles retrieval of all perspectives for an issue
func (h *PerspectiveHandler) HandleGetPerspectivesByIssue(c *gin.Context) {
	c.Header("Access-Control-Allow-Origin", "*")

	issueID := c.Param("issueId")
	if issueID == "" {
		c.JSON(http.StatusBadRequest, PerspectiveResponse{
			Success: false,
			Message: "Missing issue ID",
		})
		return
	}

	perspectives, err := h.service.GetPerspectivesByIssue(issueID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, PerspectiveResponse{
			Success: false,
			Message: "Failed to retrieve perspectives",
		})
		return
	}

	// Enhance perspectives with IPFS URLs
	type EnhancedPerspective struct {
		Perspective
		IPFSUrl string `json:"ipfsUrl"`
	}

	enhancedPerspectives := make([]EnhancedPerspective, len(perspectives))
	for i, p := range perspectives {
		enhancedPerspectives[i] = EnhancedPerspective{
			Perspective: p,
			IPFSUrl:     h.service.ipfsService.GetIPFSGatewayURL(p.IPFSHash),
		}
	}

	c.JSON(http.StatusOK, PerspectiveResponse{
		Success: true,
		Message: "Perspectives retrieved successfully",
		Data:    enhancedPerspectives,
	})
}