package main

import (
	"context"
	"net/http"
	"net/http/httptest"
	"sync"
	"testing"
	"time"

	"github.com/gin-gonic/gin"
)

func TestSchedulerHTTPAddrDefaultsToLoopback(t *testing.T) {
	if got := schedulerHTTPAddr("", 8081); got != "127.0.0.1:8081" {
		t.Fatalf("schedulerHTTPAddr() = %q, want 127.0.0.1:8081", got)
	}
	if got := schedulerHTTPAddr("0.0.0.0", 8081); got != "0.0.0.0:8081" {
		t.Fatalf("schedulerHTTPAddr() = %q, want 0.0.0.0:8081", got)
	}
}

func TestSchedulerMetricsAuthMiddleware(t *testing.T) {
	gin.SetMode(gin.TestMode)

	tests := []struct {
		name       string
		headerName string
		header     string
		wantStatus int
	}{
		{name: "missing token", wantStatus: http.StatusUnauthorized},
		{name: "bad bearer token", headerName: "Authorization", header: "Bearer bad", wantStatus: http.StatusUnauthorized},
		{name: "valid bearer token", headerName: "Authorization", header: "Bearer secret-token", wantStatus: http.StatusNoContent},
		{name: "valid internal token header", headerName: "X-Internal-Metrics-Token", header: "secret-token", wantStatus: http.StatusNoContent},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			router := gin.New()
			router.GET("/metrics", schedulerMetricsAuthMiddleware("secret-token"), func(c *gin.Context) {
				c.Status(http.StatusNoContent)
			})

			req := httptest.NewRequest(http.MethodGet, "/metrics", nil)
			if tt.headerName != "" {
				req.Header.Set(tt.headerName, tt.header)
			}
			rec := httptest.NewRecorder()

			router.ServeHTTP(rec, req)
			if rec.Code != tt.wantStatus {
				t.Fatalf("status = %d, want %d", rec.Code, tt.wantStatus)
			}
		})
	}
}

func TestStartSchedulerWorkerWaitsForRunToReturn(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	var wg sync.WaitGroup
	started := make(chan struct{})
	startSchedulerWorker(ctx, &wg, "test_worker", testSchedulerLogger{}, func(ctx context.Context) {
		close(started)
		<-ctx.Done()
	})

	select {
	case <-started:
	case <-time.After(time.Second):
		t.Fatal("worker did not start")
	}

	cancel()
	if ok := waitSchedulerWorkers(&wg, time.Second, testSchedulerLogger{}); !ok {
		t.Fatal("expected worker shutdown wait to complete")
	}
}

func TestWaitSchedulerWorkersTimesOut(t *testing.T) {
	var wg sync.WaitGroup
	wg.Add(1)
	defer wg.Done()

	if ok := waitSchedulerWorkers(&wg, time.Nanosecond, testSchedulerLogger{}); ok {
		t.Fatal("expected worker shutdown wait to time out")
	}
}

type testSchedulerLogger struct{}

func (testSchedulerLogger) Infof(string, ...interface{})  {}
func (testSchedulerLogger) Errorf(string, ...interface{}) {}