package mcp

import (
	"bytes"
	"encoding/json"
	"github.com/gin-gonic/gin"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

// TestHTTPHandlerToolsList tests POST /mcp tools/list request
func TestHTTPHandlerToolsList(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.POST("/mcp", HTTPHandler())
	payload := map[string]interface{}{
		"jsonrpc": "2.0",
		"id":      1,
		"method":  "tools/list",
	}
	body, _ := json.Marshal(payload)
	req := httptest.NewRequest("POST", "/mcp", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}
}

// TestHTTPHandlerAPIOverviewTool tests tools/call api_overview
func TestHTTPHandlerAPIOverviewTool(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.POST("/mcp", HTTPHandler())
	payload := map[string]interface{}{
		"jsonrpc": "2.0",
		"id":      2,
		"method":  "tools/call",
		"params": map[string]interface{}{
			"name":      "api_overview",
			"arguments": map[string]interface{}{},
		},
	}
	body, _ := json.Marshal(payload)
	req := httptest.NewRequest("POST", "/mcp", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}
}

// TestHTTPHandlerInvalidJSON tests invalid JSON request
func TestHTTPHandlerInvalidJSON(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.POST("/mcp", HTTPHandler())
	req := httptest.NewRequest("POST", "/mcp", strings.NewReader("invalid json"))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400, got %d", w.Code)
	}
}

// TestStreamableHTTPDELETEHandler tests DELETE response
func TestStreamableHTTPDELETEHandler(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.DELETE("/api/v1/mcp", StreamableHTTPDELETEHandler())
	req := httptest.NewRequest("DELETE", "/api/v1/mcp", nil)
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	if w.Code != http.StatusMethodNotAllowed {
		t.Errorf("expected status 405, got %d", w.Code)
	}
}

// TestMCPInitialize tests initialize method
func TestMCPInitialize(t *testing.T) {
	gin.SetMode(gin.TestMode)
	router := gin.New()
	router.POST("/mcp", HTTPHandler())
	payload := map[string]interface{}{
		"jsonrpc": "2.0",
		"id":      1,
		"method":  "initialize",
	}
	body, _ := json.Marshal(payload)
	req := httptest.NewRequest("POST", "/mcp", bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	router.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}
}