package view

import (
	"context"

	"github.com/derailed/k9s/internal"
	"github.com/derailed/k9s/internal/dao"
	"github.com/derailed/k9s/internal/render"
	"github.com/derailed/k9s/internal/ui"
	"github.com/gdamore/tcell"
	"github.com/rs/zerolog/log"
	rbacv1 "k8s.io/api/rbac/v1"
	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
)

const (
	ClusterRole roleKind = iota
	Role

	clusterWide  = "*"
	rbacTitle    = "Policies"
	rbacTitleFmt = " [fg:bg:b]%s([hilite:bg:b]%s[fg:bg:-])[fg:bg:-][[count:bg:b]%d[fg:bg:-]][fg:bg:-] "
)

var (
	k8sVerbs = []string{
		"get",
		"list",
		"watch",
		"create",
		"patch",
		"update",
		"delete",
		"deletecollection",
	}

	httpTok8sVerbs = map[string]string{
		"post": "create",
		"put":  "update",
	}
)

type roleKind = int8

// Rbac presents an RBAC policy viewer.
type Rbac struct {
	ResourceViewer
}

// NewRbac returns a new viewer.
func NewRbac(gvr dao.GVR) ResourceViewer {
	log.Debug().Msgf(">>>>> NEWRBAC %v!!!!!", gvr)
	r := Rbac{
		ResourceViewer: NewBrowser(gvr),
	}
	r.GetTable().SetColorerFn(render.Rbac{}.ColorerFunc())
	r.SetBindKeysFn(r.bindKeys)
	r.GetTable().SetSortCol(1, len(render.Rbac{}.Header(render.ClusterWide)), true)

	return &r
}

func (r *Rbac) showPolicies(app *App, ns, resource, selection string) {
	log.Debug().Msgf("SHOWING!! %q--%q--%q", ns, resource, selection)
}

func (r *Rbac) UpdateTitle() {
	// BOZO!!
	// r.GetTable().SetTitle(ui.SkinTitle(fmt.Sprintf(rbacTitleFmt, rbacTitle, r.path, r.GetRowCount()-1), r.app.Styles.Frame()))
}

func (r *Rbac) bindKeys(aa ui.KeyActions) {
	aa.Delete(ui.KeyShiftA, tcell.KeyCtrlSpace, ui.KeySpace)
	aa.Add(ui.KeyActions{
		// BOZO!!
		// tcell.KeyEscape: ui.NewKeyAction("Reset", r.resetCmd, false),
		// ui.KeySlash:     ui.NewKeyAction("Filter", r.activateCmd, false),
		ui.KeyShiftO: ui.NewKeyAction("Sort APIGroup", r.GetTable().SortColCmd(1, true), false),
	})
}

// BOZO!!
// func (r *Rbac) refresh() {
// 	if r.app.Conn() == nil {
// 		return
// 	}
// 	data, err := r.reconcile(r.roleName, r.roleType)
// 	if err != nil {
// 		log.Error().Err(err).Msgf("Refresh for %s:%d", r.roleName, r.roleType)
// 		r.app.Flash().Err(err)
// 	}
// 	r.Update(data)
// 	r.UpdateTitle()
// }

// func (r *Rbac) resetCmd(evt *tcell.EventKey) *tcell.EventKey {
// 	if !r.GetTable().SearchBuff().Empty() {
// 		r.GetTable().SearchBuff().Reset()
// 		return nil
// 	}

// 	return r.App().PrevCmd(evt)
// }

// func (r *Rbac) backCmd(evt *tcell.EventKey) *tcell.EventKey {
// 	if r.cancelFn != nil {
// 		r.cancelFn()
// 	}

// 	if r.SearchBuff().IsActive() {
// 		r.SearchBuff().Reset()
// 		return nil
// 	}

// 	return r.app.PrevCmd(evt)
// }

// func (r *Rbac) reconcile(name string, kind roleKind) (render.TableData, error) {
// 	var table render.TableData

// 	rows, err := r.fetchRoles(name, kind)
// 	if err != nil {
// 		return table, err
// 	}

// 	return buildTable(r, rows), nil
// }

// func (r *Rbac) Header() render.HeaderRow {
// 	return render.Rbac{}.Header(render.AllNamespaces)
// }

// func (r *Rbac) GetCache() render.RowEvents {
// 	return r.cache
// }

// func (r *Rbac) SetCache(evts render.RowEvents) {
// 	r.cache = evts
// }

// func (r *Rbac) fetchRoles(name string, kind roleKind) (render.Rows, error) {
// 	switch kind {
// 	case ClusterRole:
// 		return r.loadClusterRoles(name)
// 	case Role:
// 		return r.loadRoles(name)
// 	default:
// 		return nil, fmt.Errorf("Expecting clusterrole/role but found %d", kind)
// 	}
// }

// func (r *Rbac) loadClusterRoles(name string) (render.Rows, error) {
// 	o, err := r.app.factory.Get("-", "rbac.authorization.k8s.io/v1/clusterroles", name, labels.Everything())
// 	if err != nil {
// 		return nil, err
// 	}

// 	var cr rbacv1.ClusterRole
// 	err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &cr)
// 	if err != nil {
// 		return nil, err
// 	}

// 	return r.parseRules(cr.Rules), nil
// }

// func (r *Rbac) loadRoles(path string) (render.Rows, error) {
// 	ns, n := k8s.Namespaced(path)
// 	o, err := r.app.factory.Get(ns, "rbac.authorization.k8s.io/v1/roles", n, labels.Everything())
// 	if err != nil {
// 		return nil, err
// 	}

// 	var ro rbacv1.Role
// 	err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &ro)
// 	if err != nil {
// 		return nil, err
// 	}

// 	return r.parseRules(ro.Rules), nil
// }

// func (r *Rbac) parseRules(rules []rbacv1.PolicyRule) render.Rows {
// 	m := make(render.Rows, 0, len(rules))
// 	for _, rule := range rules {
// 		for _, grp := range rule.APIGroups {
// 			for _, res := range rule.Resources {
// 				k := res
// 				if grp != "" {
// 					k = res + "." + grp
// 				}
// 				for _, na := range rule.ResourceNames {
// 					m = m.Upsert(r.prepRow(fqn(k, na), grp, rule.Verbs))
// 				}
// 				m = m.Upsert(r.prepRow(k, grp, rule.Verbs))
// 			}
// 		}
// 		for _, nres := range rule.NonResourceURLs {
// 			if nres[0] != '/' {
// 				nres = "/" + nres
// 			}
// 			m = m.Upsert(r.prepRow(nres, "", rule.Verbs))
// 		}
// 	}

// 	return m
// }

// func (r *Rbac) prepRow(res, grp string, verbs []string) render.Row {
// 	if grp != "" {
// 		grp = toGroup(grp)
// 	}

// 	fields := make(render.Fields, 0, len(r.Header()))
// 	fields = append(fields, res, group)
// 	return render.Row{
// 		ID:     res,
// 		Fields: append(fields, verbs...),
// 	}
// }

// func asVerbs(verbs ...string) []string {
// 	const (
// 		verbLen    = 4
// 		unknownLen = 30
// 	)

// 	r := make([]string, 0, len(k8sVerbs)+1)
// 	for _, v := range k8sVerbs {
// 		r = append(r, toVerbIcon(hasVerb(verbs, v)))
// 	}

// 	var unknowns []string
// 	for _, v := range verbs {
// 		if hv, ok := httpTok8sVerbs[v]; ok {
// 			v = hv
// 		}
// 		if !hasVerb(k8sVerbs, v) && v != clusterWide {
// 			unknowns = append(unknowns, v)
// 		}
// 	}

// 	return append(r, resource.Truncate(strings.Join(unknowns, ","), unknownLen))
// }

// func toVerbIcon(ok bool) string {
// 	if ok {
// 		return "[green::b] ✓ [::]"
// 	}
// 	return "[orangered::b] 𐄂 [::]"
// }

// func hasVerb(verbs []string, verb string) bool {
// 	if len(verbs) == 1 && verbs[0] == clusterWide {
// 		return true
// 	}

// 	for _, v := range verbs {
// 		if hv, ok := httpTok8sVerbs[v]; ok {
// 			if hv == verb {
// 				return true
// 			}
// 		}
// 		if v == verb {
// 			return true
// 		}
// 	}

// 	return false
// }

// func toGroup(g string) string {
// 	if g == "" {
// 		return "v1"
// 	}
// 	return g
// }

func showRoleBinding(app *App, _, resource, selection string) {
	// ns, n := k8s.Namespaced(selection)
	// rb, err := app.Conn().DialOrDie().RbacV1().RoleBindings(ns).Get(n, metav1.GetOptions{})
	// if err != nil {
	// 	app.Flash().Errf("Unable to retrieve rolebindings for %s", selection)
	// 	return
	// }
	// BOZO!!
	// app.inject(NewRbac(fqn(ns, rb.RoleRef.Name), Role, selection))
}

func showClusterRoleBinding(app *App, ns, gvr, path string) {
	o, err := app.factory.Get("rbac.authorization.k8s.io/v1/clusterrolebindings", path, labels.Everything())
	if err != nil {
		app.Flash().Err(err)
		return
	}

	var crb rbacv1.ClusterRoleBinding
	err = runtime.DefaultUnstructuredConverter.FromUnstructured(o.(*unstructured.Unstructured).Object, &crb)
	if err != nil {
		app.Flash().Errf("Unable to retrieve clusterrolebindings for %s", path)
		return
	}

	// BOZO!! Must make sure cluster roles are in cache prior to loading rbac view.
	app.factory.ForResource("-", "rbac.authorization.k8s.io/v1/clusterroles")
	app.factory.WaitForCacheSync()

	// BOZO!!
	// app.inject(NewRbac(crb.RoleRef.Name, ClusterRole, selection))
}

func showRBAC(app *App, _, gvr, path string) {
	log.Debug().Msgf("Showing RBAC %q--%q", gvr, path)
	v := NewRbac(dao.GVR("rbac"))
	v.SetContextFn(rbacCtxt(app, gvr, path))
	app.inject(v)
}

func rbacCtxt(app *App, gvr, path string) ContextFunc {
	return func(ctx context.Context) context.Context {
		ctx = context.WithValue(ctx, internal.KeyPath, path)
		return context.WithValue(ctx, internal.KeyGVR, gvr)
	}
}