package policies

import (
	"fmt"
	"testing"

	"github.com/cedar-policy/cedar-go"
	"github.com/stretchr/testify/assert"
	"gitlab.com/mokhax/spike/pkg/gid"
)

func build(f func(*cedar.Request)) *cedar.Request {
	request := &cedar.Request{
		Principal: gid.NewEntityUID("gid://example/User/1"),
		Action:    cedar.NewEntityUID("HttpMethod", "GET"),
		Resource:  cedar.NewEntityUID("HttpPath", "/"),
		Context: cedar.NewRecord(cedar.RecordMap{
			"host": cedar.String("idp.example.com"),
		}),
	}
	f(request)
	return request
}

func TestAllowed(t *testing.T) {
	allowed := []*cedar.Request{
		build(func(r *cedar.Request) {}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "POST")
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "PUT")
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "PATCH")
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "DELETE")
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "HEAD")
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Resource = cedar.NewEntityUID("HttpPath", "/organizations.json")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("api.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Resource = cedar.NewEntityUID("HttpPath", "/groups.json")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("api.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Resource = cedar.NewEntityUID("HttpPath", "/.well-known/openid-configuration")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("idp.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Resource = cedar.NewEntityUID("HttpPath", "/.well-known/oauth-authorization-server")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("idp.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/*")
			r.Resource = cedar.NewEntityUID("HttpPath", "/.well-known/openid-configuration")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("idp.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/*")
			r.Resource = cedar.NewEntityUID("HttpPath", "/.well-known/oauth-authorization-server")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("idp.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "POST")
			r.Resource = cedar.NewEntityUID("HttpPath", "/twirp/authx.rpc.Ability/Allowed")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("idp.example.com"),
			})
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.NewEntityUID("gid://example/User/1")
			r.Action = cedar.NewEntityUID("HttpMethod", "GET")
			r.Resource = cedar.NewEntityUID("HttpPath", "/index.html")
			r.Context = cedar.NewRecord(cedar.RecordMap{
				"host": cedar.String("ui.example.com"),
			})
		}),
	}

	for _, tt := range allowed {
		t.Run(fmt.Sprintf("allows: %v/%v %v %v%v", tt.Principal.Type, tt.Principal.ID, tt.Action.ID, tt.Context.Map()["host"], tt.Resource.ID), func(t *testing.T) {
			assert.True(t, Allowed(*tt))
		})
	}

	denied := []*cedar.Request{
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("POST"))
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("PUT"))
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("PATCH"))
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("DELETE"))
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("HEAD"))
		}),
		build(func(r *cedar.Request) {
			r.Principal = gid.ZeroEntityUID()
			r.Action = cedar.NewEntityUID("HttpMethod", cedar.String("TRACE"))
		}),
	}

	for _, tt := range denied {
		t.Run(fmt.Sprintf("denies: %v/%v %v %v%v", tt.Principal.Type, tt.Principal.ID, tt.Action.ID, tt.Context.Map()["host"], tt.Resource.ID), func(t *testing.T) {
			assert.False(t, Allowed(*tt))
		})
	}
}