package handlers

import (
	"net/http"

	"github.com/breakpilot/ai-compliance-sdk/internal/ucca"
	"github.com/gin-gonic/gin"
)

// RAGHandlers handles RAG search API endpoints.
type RAGHandlers struct {
	ragClient *ucca.LegalRAGClient
}

// NewRAGHandlers creates new RAG handlers.
func NewRAGHandlers() *RAGHandlers {
	return &RAGHandlers{
		ragClient: ucca.NewLegalRAGClient(),
	}
}

// SearchRequest represents a RAG search request.
type SearchRequest struct {
	Query       string   `json:"query" binding:"required"`
	Regulations []string `json:"regulations,omitempty"`
	TopK        int      `json:"top_k,omitempty"`
}

// Search performs a semantic search across the compliance regulation corpus.
// POST /sdk/v1/rag/search
func (h *RAGHandlers) Search(c *gin.Context) {
	var req SearchRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.TopK <= 0 || req.TopK > 20 {
		req.TopK = 5
	}

	results, err := h.ragClient.Search(c.Request.Context(), req.Query, req.Regulations, req.TopK)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "RAG search failed: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"query":   req.Query,
		"results": results,
		"count":   len(results),
	})
}

// ListRegulations returns the list of available regulations in the corpus.
// GET /sdk/v1/rag/regulations
func (h *RAGHandlers) ListRegulations(c *gin.Context) {
	regs := h.ragClient.ListAvailableRegulations()

	// Optionally filter by category
	category := c.Query("category")
	if category != "" {
		filtered := make([]ucca.CERegulationInfo, 0)
		for _, r := range regs {
			if r.Category == category {
				filtered = append(filtered, r)
			}
		}
		regs = filtered
	}

	c.JSON(http.StatusOK, gin.H{
		"regulations": regs,
		"count":       len(regs),
	})
}