package main

import (
	"context"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync/atomic"
	"testing"
	"time"
)

func withJobServer(t *testing.T, h http.HandlerFunc) {
	t.Helper()
	srv := httptest.NewServer(h)
	jobHost.Lock()
	oldBase, oldTok := jobHost.base, jobHost.token
	jobHost.base, jobHost.token = srv.URL, "t"
	jobHost.Unlock()
	oldWait := putRetryWait
	putRetryWait = []time.Duration{time.Millisecond, time.Millisecond, time.Millisecond, time.Millisecond}
	t.Cleanup(func() {
		srv.Close()
		jobHost.Lock()
		jobHost.base, jobHost.token = oldBase, oldTok
		jobHost.Unlock()
		putRetryWait = oldWait
	})
}

func openText(s string) func() (io.ReadCloser, int64, error) {
	return func() (io.ReadCloser, int64, error) { return io.NopCloser(strings.NewReader(s)), int64(len(s)), nil }
}

func TestPutOutputRetriesAfterAProxyError(t *testing.T) {
	var calls, stored atomic.Int32
	withJobServer(t, func(w http.ResponseWriter, r *http.Request) {
		if calls.Add(1) <= 2 {
			http.Error(w, "bad gateway", 502)
			return
		}
		b, _ := io.ReadAll(r.Body)
		if string(b) == "video" {
			stored.Add(1)
		}
		w.Write([]byte("ok"))
	})
	n, err := putOutputWithRetry(context.Background(), "j", "out.mp4", openText("video"))
	if err != nil || n != 5 || calls.Load() != 3 || stored.Load() != 1 {
		t.Fatalf("n=%d err=%v calls=%d stored=%d", n, err, calls.Load(), stored.Load())
	}
}

func TestPutOutputDoesNotRetryARefusal(t *testing.T) {
	var calls atomic.Int32
	withJobServer(t, func(w http.ResponseWriter, r *http.Request) { calls.Add(1); http.Error(w, "no such job", 404) })
	_, err := putOutputWithRetry(context.Background(), "j", "out.mp4", openText("video"))
	if err == nil || !strings.Contains(err.Error(), "404") || calls.Load() != 1 {
		t.Fatalf("err=%v calls=%d", err, calls.Load())
	}
}

func TestPutOutputGivesUpAfterTheLastTry(t *testing.T) {
	var calls atomic.Int32
	withJobServer(t, func(w http.ResponseWriter, r *http.Request) { calls.Add(1); http.Error(w, "x", 502) })
	_, err := putOutputWithRetry(context.Background(), "j", "out.mp4", openText("video"))
	if err == nil || !strings.Contains(err.Error(), "502") || calls.Load() != 5 {
		t.Fatalf("err=%v calls=%d", err, calls.Load())
	}
}