package web

import (
	"context"
	"io"
	"net/http"
	"net/url"
	"sync"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/shcizo/package-updater/internal/master/model"
	"github.com/shcizo/package-updater/internal/master/poller"
)

// fakePoller records the services it was asked to check and answers err.
type fakePoller struct {
	mu    sync.Mutex
	err   error
	calls []int64
}

func (f *fakePoller) PollService(_ context.Context, id int64) error {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.calls = append(f.calls, id)
	return f.err
}

func (f *fakePoller) called() []int64 {
	f.mu.Lock()
	defer f.mu.Unlock()
	return append([]int64(nil), f.calls...)
}

func TestPollService(t *testing.T) {
	tests := []struct {
		name         string
		id           string
		err          error
		wantStatus   int
		wantLocation string
		wantBody     string
		wantCalls    []int64
	}{
		{name: "redirects to the service page", id: "1", wantStatus: http.StatusSeeOther, wantLocation: "/services/1", wantCalls: []int64{1}},
		{name: "unknown service is 404", id: "1", err: model.ErrNotFound, wantStatus: http.StatusNotFound, wantCalls: []int64{1}},
		{name: "invalid id is 400", id: "abc", wantStatus: http.StatusBadRequest},
		{name: "not polled is 409 with the reason", id: "1", err: &poller.NotPolledError{Reason: model.ReasonNoTag},
			wantStatus: http.StatusConflict, wantBody: "Cannot check: follows no tag.", wantCalls: []int64{1}},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			fp := &fakePoller{err: tt.err}
			srv, _, _, _, _ := newTestEnvFull(t, func(*Config) {}, fp)

			resp, err := noRedirectClient().PostForm(srv.URL+"/services/"+tt.id+"/poll", url.Values{"csrf_token": {"csrf"}})
			require.NoError(t, err)
			defer resp.Body.Close()
			body, _ := io.ReadAll(resp.Body)

			assert.Equal(t, tt.wantStatus, resp.StatusCode)
			assert.Equal(t, tt.wantLocation, resp.Header.Get("Location"))
			assert.Contains(t, string(body), tt.wantBody)
			assert.Equal(t, tt.wantCalls, fp.called())
		})
	}
}

func TestServicePage_CheckNowForm(t *testing.T) {
	srv, store, _, _, _ := newTestEnv(t)
	store.services[0].ActualDigest = "sha256:" + "a"
	_, body := get(t, srv, "/services/1")
	assert.Contains(t, body, `action="/services/1/poll"`)
	assert.Contains(t, body, `<button type="submit">Check now</button>`)
	assert.NotContains(t, body, "Check unavailable")
}

func TestServicePage_CheckNowDisabledWhenNotPolled(t *testing.T) {
	srv, _, _, _, _ := newTestEnv(t)
	_, body := get(t, srv, "/services/2") // follows no tag
	assert.Contains(t, body, `<button type="submit" disabled>Check now</button>`)
	assert.Contains(t, body, "Check unavailable: follows no tag.")
}