feat: Phase 4 — LLM 集成，PR 描述生成与 AI 代码审查

handlers/generate.go

@@ -2,8 +2,11 @@ package handlers
 
 import (
 	"database/sql"
+	"encoding/json"
+	"fmt"
 	"net/http"
 
+	"github.com/HoHD/PR-Helper/services"
 	"github.com/gin-gonic/gin"
 )
 
@@ -15,7 +18,63 @@ func NewGenerateHandler(db *sql.DB) *GenerateHandler {
 	return &GenerateHandler{db: db}
 }
 
-// Generate handles POST /api/repos/:id/generate — stub for Phase 4
+// Generate handles POST /api/repos/:id/generate — SSE streaming PR description generation.
 func (h *GenerateHandler) Generate(c *gin.Context) {
-	c.JSON(http.StatusNotImplemented, gin.H{"error": "generate not implemented yet — coming in Phase 4"})
+	id := c.Param("id")
+
+	// Get repo info
+	var localPath string
+	err := h.db.QueryRow(`SELECT local_path FROM repositories WHERE id = ?`, id).Scan(&localPath)
+	if err == sql.ErrNoRows {
+		c.JSON(http.StatusNotFound, gin.H{"error": "repository not found"})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Parse request
+	var req struct {
+		Base string `json:"base" binding:"required"`
+		Head string `json:"head" binding:"required"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "base and head are required"})
+		return
+	}
+
+	// Set SSE headers
+	c.Header("Content-Type", "text/event-stream")
+	c.Header("Cache-Control", "no-cache")
+	c.Header("Connection", "keep-alive")
+	c.Header("X-Accel-Buffering", "no")
+	c.Status(http.StatusOK)
+
+	flusher, ok := c.Writer.(http.Flusher)
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "streaming not supported"})
+		return
+	}
+
+	sendEvent := func(event string, data interface{}) {
+		jsonData, _ := json.Marshal(data)
+		fmt.Fprintf(c.Writer, "event: %s\ndata: %s\n\n", event, jsonData)
+		flusher.Flush()
+	}
+
+	// Update last_used
+	h.db.Exec(`UPDATE repositories SET last_used = datetime('now') WHERE id = ?`, id)
+
+	// Generate PR description
+	pr, err := services.GeneratePR(h.db, localPath, req.Base, req.Head, sendEvent)
+	if err != nil {
+		sendEvent("error", map[string]interface{}{"message": err.Error()})
+		return
+	}
+
+	// Save analysis to DB
+	resultJSON, _ := json.Marshal(pr)
+	h.db.Exec(`INSERT INTO analyses (repo_id, type, base_ref, head_ref, result) VALUES (?, 'pr_description', ?, ?, ?)`,
+		id, req.Base, req.Head, string(resultJSON))
 }

handlers/review.go

@@ -2,8 +2,12 @@ package handlers
 
 import (
 	"database/sql"
+	"encoding/json"
+	"fmt"
 	"net/http"
+	"strconv"
 
+	"github.com/HoHD/PR-Helper/services"
 	"github.com/gin-gonic/gin"
 )
 
@@ -15,9 +19,85 @@ func NewReviewHandler(db *sql.DB) *ReviewHandler {
 	return &ReviewHandler{db: db}
 }
 
-// Review handles POST /api/repos/:id/review — stub for Phase 4
+// Review handles POST /api/repos/:id/review — SSE streaming AI code review.
 func (h *ReviewHandler) Review(c *gin.Context) {
-	c.JSON(http.StatusNotImplemented, gin.H{"error": "review not implemented yet — coming in Phase 4"})
+	id := c.Param("id")
+
+	// Get repo info
+	var localPath string
+	err := h.db.QueryRow(`SELECT local_path FROM repositories WHERE id = ?`, id).Scan(&localPath)
+	if err == sql.ErrNoRows {
+		c.JSON(http.StatusNotFound, gin.H{"error": "repository not found"})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+
+	// Parse request
+	var req struct {
+		Base string `json:"base" binding:"required"`
+		Head string `json:"head" binding:"required"`
+		TopN *int   `json:"top_n"`
+	}
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "base and head are required"})
+		return
+	}
+
+	// Determine Top-N: request value > settings default (20)
+	topN := 20
+	if req.TopN != nil {
+		topN = *req.TopN
+	} else {
+		var topNStr string
+		h.db.QueryRow(`SELECT value FROM settings WHERE key = 'review.top_n'`).Scan(&topNStr)
+		if topNStr != "" {
+			if n, err := strconv.Atoi(topNStr); err == nil && n > 0 {
+				topN = n
+			}
+		}
+	}
+
+	// Set SSE headers
+	c.Header("Content-Type", "text/event-stream")
+	c.Header("Cache-Control", "no-cache")
+	c.Header("Connection", "keep-alive")
+	c.Header("X-Accel-Buffering", "no")
+	c.Status(http.StatusOK)
+
+	flusher, ok := c.Writer.(http.Flusher)
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "streaming not supported"})
+		return
+	}
+
+	sendEvent := func(event string, data interface{}) {
+		jsonData, _ := json.Marshal(data)
+		fmt.Fprintf(c.Writer, "event: %s\ndata: %s\n\n", event, jsonData)
+		flusher.Flush()
+	}
+
+	// Update last_used
+	h.db.Exec(`UPDATE repositories SET last_used = datetime('now') WHERE id = ?`, id)
+
+	// Run AI review
+	err = services.GenerateReview(h.db, localPath, req.Base, req.Head, topN, sendEvent)
+	if err != nil {
+		sendEvent("error", map[string]interface{}{"message": err.Error()})
+		return
+	}
+
+	// Save analysis to DB
+	resultData := map[string]interface{}{
+		"base":   req.Base,
+		"head":   req.Head,
+		"top_n":  topN,
+	}
+	resultJSON, _ := json.Marshal(resultData)
+	h.db.Exec(`INSERT INTO analyses (repo_id, type, base_ref, head_ref, result) VALUES (?, 'code_review', ?, ?, ?)`,
+		id, req.Base, req.Head, string(resultJSON))
 }
 
 // SaveNotes handles POST /api/repos/:id/review/notes — stub for Phase 5