package main

import (
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
	"time"

	"github.com/prometheus/client_golang/prometheus"
)

func TestHandleRouteForwardsToCustomBackend(t *testing.T) {
	custom := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/api/v1/send_push" {
			t.Fatalf("path = %q", r.URL.Path)
		}
		body, _ := io.ReadAll(r.Body)
		if !strings.Contains(string(body), "apple_bubbles") {
			t.Fatalf("body = %s", body)
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"status":"OK"}`))
	}))
	defer custom.Close()

	cfg := Config{
		Routes: []Route{
			{Prefixes: []string{"apple_bubbles"}, URL: custom.URL},
			{Prefixes: []string{"apple_rn"}, URL: "https://example.invalid"},
		},
		RequestTimeout: time.Duration(defaultRequestTimeoutSec) * time.Second,
	}
	proxy := NewProxy(cfg, NewMetrics(prometheus.NewRegistry()))

	req := httptest.NewRequest(http.MethodPost, "/api/v1/send_push", strings.NewReader(`{"platform":"apple_bubbles","device_id":"tok","server_id":"s1"}`))
	rec := httptest.NewRecorder()

	handleRoute(rec, req, proxy, cfg, "/api/v1/send_push")

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d body = %s", rec.Code, rec.Body.String())
	}
	if !strings.Contains(rec.Body.String(), `"status":"OK"`) {
		t.Fatalf("body = %s", rec.Body.String())
	}
}

func TestHandleRouteUnknownPlatform(t *testing.T) {
	cfg := Config{
		Routes: []Route{
			{Prefixes: []string{"apple_bubbles"}, URL: "http://localhost:1"},
		},
		RequestTimeout: time.Duration(defaultRequestTimeoutSec) * time.Second,
	}
	proxy := NewProxy(cfg, NewMetrics(prometheus.NewRegistry()))

	req := httptest.NewRequest(http.MethodPost, "/api/v1/send_push", strings.NewReader(`{"platform":"unknown_app","device_id":"tok","server_id":"s1"}`))
	rec := httptest.NewRecorder()

	handleRoute(rec, req, proxy, cfg, "/api/v1/send_push")

	if !strings.Contains(rec.Body.String(), `"status":"FAIL"`) {
		t.Fatalf("body = %s", rec.Body.String())
	}
	if !strings.Contains(rec.Body.String(), "unknown_app") {
		t.Fatalf("body = %s", rec.Body.String())
	}
}

func TestHealthEndpoint(t *testing.T) {
	req := httptest.NewRequest(http.MethodGet, "/health", nil)
	rec := httptest.NewRecorder()

	handleHealth(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d", rec.Code)
	}
	if ct := rec.Header().Get("Content-Type"); !strings.Contains(ct, "application/json") {
		t.Fatalf("content-type = %q", ct)
	}
	if strings.TrimSpace(rec.Body.String()) != `{"status":"ok"}` {
		t.Fatalf("body = %q", rec.Body.String())
	}
}