package handler

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestHealth(t *testing.T) {
	request := httptest.NewRequest(http.MethodGet, "/health", nil)
	response := httptest.NewRecorder()

	NewRouter().ServeHTTP(response, request)

	if response.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", response.Code, http.StatusOK)
	}
	if got := response.Header().Get("Content-Type"); got != "application/json; charset=utf-8" {
		t.Fatalf("Content-Type = %q, want application/json; charset=utf-8", got)
	}

	var body healthResponse
	if err := json.NewDecoder(response.Body).Decode(&body); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if body.Status != "ok" {
		t.Fatalf("status body = %q, want ok", body.Status)
	}
}

func TestHealthRejectsOtherMethods(t *testing.T) {
	request := httptest.NewRequest(http.MethodPost, "/health", nil)
	response := httptest.NewRecorder()

	NewRouter().ServeHTTP(response, request)

	if response.Code != http.StatusMethodNotAllowed {
		t.Fatalf("status = %d, want %d", response.Code, http.StatusMethodNotAllowed)
	}
}

func TestRouterDoesNotExposeMCPWithoutConfiguredHandler(t *testing.T) {
	request := httptest.NewRequest(http.MethodPost, "/mcp", nil)
	response := httptest.NewRecorder()

	NewRouter().ServeHTTP(response, request)

	if response.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want %d", response.Code, http.StatusNotFound)
	}
}

func TestRouterRegistersConfiguredMCPHandler(t *testing.T) {
	request := httptest.NewRequest(http.MethodPost, "/mcp", nil)
	response := httptest.NewRecorder()
	mcp := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusAccepted)
	})

	NewRouter(RouterOptions{MCP: mcp}).ServeHTTP(response, request)

	if response.Code != http.StatusAccepted {
		t.Fatalf("status = %d, want %d", response.Code, http.StatusAccepted)
	}
}

func TestRouterRegistersConfiguredDashScopeChatHandler(t *testing.T) {
	request := httptest.NewRequest(http.MethodPost, "/api/v1/apps/test-app/completion", nil)
	response := httptest.NewRecorder()
	chat := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.PathValue("app_id") != "test-app" {
			t.Fatalf("app_id = %q", r.PathValue("app_id"))
		}
		w.WriteHeader(http.StatusAccepted)
	})

	NewRouter(RouterOptions{DashScopeChat: chat}).ServeHTTP(response, request)

	if response.Code != http.StatusAccepted {
		t.Fatalf("status = %d, want %d", response.Code, http.StatusAccepted)
	}
}