// Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package accounting_test

import (
	"crypto/rand"
	"fmt"
	"testing"
	"time"

	"github.com/skyrings/skyring-common/tools/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"storj.io/storj/internal/memory"
	"storj.io/storj/internal/testcontext"
	"storj.io/storj/internal/testplanet"
	"storj.io/storj/pkg/accounting"
	"storj.io/storj/pkg/pb"
	"storj.io/storj/pkg/storj"
)

func TestProjectUsage(t *testing.T) {
	cases := []struct {
		name             string
		expectedExceeded bool
		expectedResource string
		expectedErrMsg   string
	}{
		{name: "doesn't exceed storage or bandwidth project limit", expectedExceeded: false, expectedErrMsg: ""},
		{name: "exceeds storage project limit", expectedExceeded: true, expectedResource: "storage", expectedErrMsg: "segment error: metainfo error: rpc error: code = ResourceExhausted desc = Exceeded Alpha Usage Limit; segment error: metainfo error: rpc error: code = ResourceExhausted desc = Exceeded Alpha Usage Limit"},
		{name: "exceeds bandwidth project limit", expectedExceeded: true, expectedResource: "bandwidth", expectedErrMsg: "segment error: metainfo error: rpc error: code = ResourceExhausted desc = Exceeded Alpha Usage Limit; segment error: metainfo error: rpc error: code = ResourceExhausted desc = Exceeded Alpha Usage Limit"},
	}

	testplanet.Run(t, testplanet.Config{
		SatelliteCount: 1, StorageNodeCount: 6, UplinkCount: 1,
	}, func(t *testing.T, ctx *testcontext.Context, planet *testplanet.Planet) {
		saDB := planet.Satellites[0].DB
		orderDB := saDB.Orders()
		acctDB := saDB.Accounting()

		// Setup: This date represents the past 30 days so that we can check
		// if the alpha max usage has been exceeded in the past month
		from := time.Now().AddDate(0, 0, -accounting.AverageDaysInMonth)

		for _, tt := range cases {
			t.Run(tt.name, func(t *testing.T) {

				// Setup: create a new project to use the projectID
				projects, err := planet.Satellites[0].DB.Console().Projects().GetAll(ctx)
				projectID := projects[0].ID
				require.NoError(t, err)
				bucketName := "testbucket"
				bucketID := createBucketID(projectID, []byte(bucketName))

				// Setup: create BucketStorageTally records to test exceeding storage project limit
				if tt.expectedResource == "storage" {
					now := time.Now()
					err := setUpCreateTallies(ctx, projectID, acctDB, now)
					require.NoError(t, err)
				}

				// Setup: create a BucketBandwidthRollup record to test exceeding bandwidth project limit
				if tt.expectedResource == "bandwidth" {
					amount := 26 * memory.GB.Int64()
					action := pb.PieceAction_GET
					now := time.Now()
					intervalStart := time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), 0, 0, 0, now.Location())
					err := orderDB.UpdateBucketBandwidthSettle(ctx, bucketID, action, amount, intervalStart)
					require.NoError(t, err)
				}

				// Execute test: get storage and bandwidth totals for a project, then check if that exceeds the max usage limit
				inlineTotal, remoteTotal, err := acctDB.ProjectStorageTotals(ctx, projectID)
				require.NoError(t, err)
				bandwidthTotal, err := acctDB.ProjectBandwidthTotal(ctx, bucketID, from)
				require.NoError(t, err)
				maxAlphaUsage := 25 * memory.GB
				actualExceeded, actualResource := accounting.ExceedsAlphaUsage(bandwidthTotal, inlineTotal, remoteTotal, maxAlphaUsage)

				require.Equal(t, tt.expectedExceeded, actualExceeded)
				require.Equal(t, tt.expectedResource, actualResource)

				// Execute test: does the uplink get an error message when the usage limits are exceeded
				expectedData := make([]byte, 50*memory.KiB)
				_, err = rand.Read(expectedData)
				require.NoError(t, err)

				actualErr := planet.Uplinks[0].Upload(ctx, planet.Satellites[0], bucketName, "test/path", expectedData)
				if tt.expectedResource == "bandwidth" || tt.expectedResource == "storage" {
					assert.EqualError(t, actualErr, tt.expectedErrMsg)
				} else {
					require.NoError(t, actualErr)
				}
			})
		}
	})
}

func createBucketID(projectID uuid.UUID, bucket []byte) []byte {
	entries := make([]string, 0)
	entries = append(entries, projectID.String())
	entries = append(entries, string(bucket))
	return []byte(storj.JoinPaths(entries...))
}

func setUpCreateTallies(ctx *testcontext.Context, projectID uuid.UUID, acctDB accounting.DB, time time.Time) error {

	// Create many records that sum greater than project usage limit of 25GB
	for i := 0; i < 4; i++ {
		bucketName := fmt.Sprintf("%s%d", "testbucket", i)
		tally := accounting.BucketStorageTally{
			BucketName:    bucketName,
			ProjectID:     projectID,
			IntervalStart: time,
			RemoteBytes:   10 * memory.GB.Int64(),
		}
		err := acctDB.CreateBucketStorageTally(ctx, tally)
		if err != nil {
			return err
		}
	}
	return nil
}