package pluginstore

import (
	"context"
	"errors"
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/grafana/grafana/pkg/plugins"
	"github.com/grafana/grafana/pkg/plugins/backendplugin"
	"github.com/grafana/grafana/pkg/plugins/log"
	"github.com/grafana/grafana/pkg/plugins/manager/pluginfakes"
	"github.com/grafana/grafana/pkg/services/featuremgmt"
)

func TestStore_ProvideService(t *testing.T) {
	t.Run("Plugin sources are added in order", func(t *testing.T) {
		tests := []struct {
			name                  string
			featureEnabled        bool
			expectedLoadOnStartup bool
			expectedBeforeStart   []plugins.Class
			expectedAfterStart    []plugins.Class
		}{
			{
				name:                  "with FlagPluginStoreServiceLoading disabled",
				featureEnabled:        false,
				expectedLoadOnStartup: false,
				expectedBeforeStart:   []plugins.Class{"1", "2", "3"},
				expectedAfterStart:    []plugins.Class{"1", "2", "3"},
			},
			{
				name:                  "with FlagPluginStoreServiceLoading enabled",
				featureEnabled:        true,
				expectedLoadOnStartup: true,
				expectedBeforeStart:   nil,
				expectedAfterStart:    []plugins.Class{"1", "2", "3"},
			},
		}

		for _, tt := range tests {
			t.Run(tt.name, func(t *testing.T) {
				var loadedSrcs []plugins.Class
				l := &pluginfakes.FakeLoader{
					LoadFunc: func(ctx context.Context, src plugins.PluginSource) ([]*plugins.Plugin, error) {
						loadedSrcs = append(loadedSrcs, src.PluginClass(ctx))
						return nil, nil
					},
				}

				srcs := &pluginfakes.FakeSourceRegistry{ListFunc: func(_ context.Context) []plugins.PluginSource {
					return []plugins.PluginSource{
						&pluginfakes.FakePluginSource{
							PluginClassFunc: func(ctx context.Context) plugins.Class {
								return "1"
							},
						},
						&pluginfakes.FakePluginSource{
							PluginClassFunc: func(ctx context.Context) plugins.Class {
								return "2"
							},
						},
						&pluginfakes.FakePluginSource{
							PluginClassFunc: func(ctx context.Context) plugins.Class {
								return "3"
							},
						},
					}
				}}

				var features featuremgmt.FeatureToggles
				if tt.featureEnabled {
					features = featuremgmt.WithFeatures(featuremgmt.FlagPluginStoreServiceLoading)
				} else {
					features = featuremgmt.WithFeatures()
				}

				service, err := ProvideService(pluginfakes.NewFakePluginRegistry(), srcs, l, features)
				require.Equal(t, tt.expectedLoadOnStartup, service.loadOnStartup)
				require.Equal(t, tt.expectedBeforeStart, loadedSrcs)
				require.NoError(t, err)
				ctx := context.Background()
				err = service.StartAsync(ctx)
				require.NoError(t, err)
				err = service.AwaitRunning(ctx)
				require.NoError(t, err)
				require.Equal(t, tt.expectedAfterStart, loadedSrcs)
			})
		}
	})
}

func TestStore_Plugin(t *testing.T) {
	t.Run("Plugin returns all non-decommissioned plugins", func(t *testing.T) {
		p1 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-datasource"}}
		p1.RegisterClient(&DecommissionedPlugin{})
		p2 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-panel"}}

		ps, err := NewPluginStoreForTest(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p1.ID: p1,
				p2.ID: p2,
			},
		}, &pluginfakes.FakeLoader{}, &pluginfakes.FakeSourceRegistry{})
		require.NoError(t, err)

		p, exists := ps.Plugin(context.Background(), p1.ID)
		require.False(t, exists)
		require.Equal(t, Plugin{}, p)

		p, exists = ps.Plugin(context.Background(), p2.ID)
		require.True(t, exists)
		require.Equal(t, p, ToGrafanaDTO(p2))
	})
}

func TestStore_Plugins(t *testing.T) {
	t.Run("Plugin returns all non-decommissioned plugins by type", func(t *testing.T) {
		p1 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "a-test-datasource", Type: plugins.TypeDataSource}}
		p2 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "b-test-panel", Type: plugins.TypePanel}}
		p3 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "c-test-panel", Type: plugins.TypePanel}}
		p4 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "d-test-app", Type: plugins.TypeApp}}
		p5 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "e-test-panel", Type: plugins.TypePanel}}
		p5.RegisterClient(&DecommissionedPlugin{})

		ps, err := NewPluginStoreForTest(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p1.ID: p1,
				p2.ID: p2,
				p3.ID: p3,
				p4.ID: p4,
				p5.ID: p5,
			},
		}, &pluginfakes.FakeLoader{}, &pluginfakes.FakeSourceRegistry{})
		require.NoError(t, err)

		ToGrafanaDTO(p1)
		pss := ps.Plugins(context.Background())
		require.Equal(t, pss, []Plugin{
			ToGrafanaDTO(p1), ToGrafanaDTO(p2),
			ToGrafanaDTO(p3), ToGrafanaDTO(p4),
		})

		pss = ps.Plugins(context.Background(), plugins.TypeApp)
		require.Equal(t, pss, []Plugin{ToGrafanaDTO(p4)})

		pss = ps.Plugins(context.Background(), plugins.TypePanel)
		require.Equal(t, pss, []Plugin{ToGrafanaDTO(p2), ToGrafanaDTO(p3)})

		pss = ps.Plugins(context.Background(), plugins.TypeDataSource)
		require.Equal(t, pss, []Plugin{ToGrafanaDTO(p1)})

		pss = ps.Plugins(context.Background(), plugins.TypeDataSource, plugins.TypeApp, plugins.TypePanel)
		require.Equal(t, pss, []Plugin{
			ToGrafanaDTO(p1), ToGrafanaDTO(p2),
			ToGrafanaDTO(p3), ToGrafanaDTO(p4),
		})
	})
}

func TestStore_Routes(t *testing.T) {
	t.Run("Routes returns all static routes for non-decommissioned plugins", func(t *testing.T) {
		p1 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "a-test-renderer", Type: plugins.TypeRenderer}, FS: pluginfakes.NewFakePluginFS("/some/dir")}
		p2 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "b-test-panel", Type: plugins.TypePanel}, FS: pluginfakes.NewFakePluginFS("/grafana/")}
		p4 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "d-test-datasource", Type: plugins.TypeDataSource}, FS: pluginfakes.NewFakePluginFS("../test")}
		p5 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "e-test-app", Type: plugins.TypeApp}, FS: pluginfakes.NewFakePluginFS("any/path")}
		p6 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "f-test-app", Type: plugins.TypeApp}}
		p6.RegisterClient(&DecommissionedPlugin{})

		ps, err := NewPluginStoreForTest(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p1.ID: p1,
				p2.ID: p2,
				p4.ID: p4,
				p5.ID: p5,
				p6.ID: p6,
			},
		}, &pluginfakes.FakeLoader{}, &pluginfakes.FakeSourceRegistry{})
		require.NoError(t, err)

		sr := func(p *plugins.Plugin) *plugins.StaticRoute {
			return &plugins.StaticRoute{PluginID: p.ID, Directory: p.FS.Base()}
		}

		rs := ps.Routes(context.Background())
		require.Equal(t, []*plugins.StaticRoute{sr(p1), sr(p2), sr(p4), sr(p5)}, rs)
	})
}

func TestProcessManager_shutdown(t *testing.T) {
	t.Run("When context is cancelled the plugin is stopped", func(t *testing.T) {
		p := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-datasource", Type: plugins.TypeDataSource}} // Backend: true
		backend := &pluginfakes.FakeBackendPlugin{}
		p.RegisterClient(backend)
		p.SetLogger(log.NewTestLogger())

		unloaded := false
		ps := New(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p.ID: p,
			},
		}, &pluginfakes.FakeLoader{
			UnloadFunc: func(_ context.Context, plugin *plugins.Plugin) (*plugins.Plugin, error) {
				require.Equal(t, p, plugin)
				unloaded = true
				return nil, nil
			},
		}, &pluginfakes.FakeSourceRegistry{})

		ctx, cancel := context.WithCancel(context.Background())

		err := ps.StartAsync(ctx)
		require.NoError(t, err)
		err = ps.AwaitRunning(ctx)
		require.NoError(t, err)

		// Cancel context to trigger shutdown
		cancel()

		// Wait for service to be fully terminated
		err = ps.AwaitTerminated(context.Background())
		require.NoError(t, err)
		require.True(t, unloaded)
	})

	t.Run("When shutdown fails, stopping method returns error", func(t *testing.T) {
		p := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-datasource", Type: plugins.TypeDataSource}}
		backend := &pluginfakes.FakeBackendPlugin{}
		p.RegisterClient(backend)
		p.SetLogger(log.NewTestLogger())

		expectedErr := errors.New("unload failed")
		ps, err := NewPluginStoreForTest(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p.ID: p,
			},
		}, &pluginfakes.FakeLoader{
			UnloadFunc: func(_ context.Context, plugin *plugins.Plugin) (*plugins.Plugin, error) {
				return nil, expectedErr
			},
		}, &pluginfakes.FakeSourceRegistry{})
		require.NoError(t, err)

		err = ps.stopping(nil)
		require.Error(t, err)
		require.ErrorIs(t, err, expectedErr)
	})
}

func TestStore_availablePlugins(t *testing.T) {
	t.Run("Decommissioned plugins are excluded from availablePlugins", func(t *testing.T) {
		p1 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-datasource"}}
		p1.RegisterClient(&DecommissionedPlugin{})
		p2 := &plugins.Plugin{JSONData: plugins.JSONData{ID: "test-app"}}

		ps, err := NewPluginStoreForTest(&pluginfakes.FakePluginRegistry{
			Store: map[string]*plugins.Plugin{
				p1.ID: p1,
				p2.ID: p2,
			},
		}, &pluginfakes.FakeLoader{}, &pluginfakes.FakeSourceRegistry{})
		require.NoError(t, err)

		aps := ps.availablePlugins(context.Background())
		require.Len(t, aps, 1)
		require.Equal(t, p2, aps[0])
	})
}

type DecommissionedPlugin struct {
	backendplugin.Plugin
}

func (p *DecommissionedPlugin) Decommission() error {
	return nil
}

func (p *DecommissionedPlugin) IsDecommissioned() bool {
	return true
}