package e2eutil

import (
	"fmt"
	"strings"
	"testing"
	"time"

	consulapi "github.com/hashicorp/consul/api"
	"github.com/hashicorp/nomad/api"
	"github.com/hashicorp/nomad/helper"
	"github.com/hashicorp/nomad/jobspec"
	"github.com/hashicorp/nomad/nomad/structs"
	"github.com/hashicorp/nomad/testutil"
	"github.com/kr/pretty"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// retries is used to control how many times to retry checking if the cluster has a leader yet
const retries = 500

func WaitForLeader(t *testing.T, nomadClient *api.Client) {
	statusAPI := nomadClient.Status()

	testutil.WaitForResultRetries(retries, func() (bool, error) {
		leader, err := statusAPI.Leader()
		return leader != "", err
	}, func(err error) {
		t.Fatalf("failed to find leader: %v", err)
	})
}

// WaitForNodesReady waits until at least `nodes` number of nodes are ready or
// fails the test.
func WaitForNodesReady(t *testing.T, nomadClient *api.Client, nodes int) {
	nodesAPI := nomadClient.Nodes()

	testutil.WaitForResultRetries(retries, func() (bool, error) {
		defer time.Sleep(time.Millisecond * 100)
		nodesList, _, err := nodesAPI.List(nil)
		if err != nil {
			return false, fmt.Errorf("error listing nodes: %v", err)
		}

		eligibleNodes := 0
		for _, node := range nodesList {
			if node.Status == "ready" {
				eligibleNodes++
			}
		}

		return eligibleNodes >= nodes, fmt.Errorf("only %d nodes ready (wanted at least %d)", eligibleNodes, nodes)
	}, func(err error) {
		t.Fatalf("failed to get enough ready nodes: %v", err)
	})
}

func stringToPtrOrNil(s string) *string {
	if s == "" {
		return nil
	}
	return helper.StringToPtr(s)
}

func RegisterAllocs(t *testing.T, nomadClient *api.Client, jobFile, jobID, cToken string) []*api.AllocationListStub {

	// Parse job
	job, err := jobspec.ParseFile(jobFile)
	require.NoError(t, err)

	// Set custom job ID (distinguish among tests)
	job.ID = helper.StringToPtr(jobID)

	// Set a Consul "operator" token for the job, if provided.
	job.ConsulToken = stringToPtrOrNil(cToken)

	// Register job
	var idx uint64
	jobs := nomadClient.Jobs()
	testutil.WaitForResult(func() (bool, error) {
		resp, meta, err := jobs.Register(job, nil)
		if err != nil {
			return false, err
		}
		idx = meta.LastIndex
		return resp.EvalID != "", fmt.Errorf("expected EvalID:%s", pretty.Sprint(resp))
	}, func(err error) {
		require.NoError(t, err)
	})

	allocs, _, err := jobs.Allocations(jobID, false, &api.QueryOptions{WaitIndex: idx})
	require.NoError(t, err)
	return allocs
}

func RegisterAndWaitForAllocs(t *testing.T, nomadClient *api.Client, jobFile, jobID, cToken string) []*api.AllocationListStub {
	jobs := nomadClient.Jobs()

	// Start allocations
	RegisterAllocs(t, nomadClient, jobFile, jobID, cToken)

	var err error
	allocs := []*api.AllocationListStub{}
	evals := []*api.Evaluation{}

	// Wrap in retry to wait until placement
	ok := assert.Eventually(t, func() bool {
		allocs, _, err = jobs.Allocations(jobID, false, nil)
		if len(allocs) < 1 {
			evals, _, err = nomadClient.Jobs().Evaluations(jobID, nil)
		}
		return len(allocs) > 0
	}, 30*time.Second, time.Second)

	msg := fmt.Sprintf("allocations not placed for %s", jobID)
	if !ok && len(evals) > 0 {
		for _, eval := range evals {
			msg += fmt.Sprintf("\n  %s - %s", eval.Status, eval.StatusDescription)
		}
	}
	require.Truef(t, ok, msg)
	require.NoError(t, err) // we only care about the last error
	return allocs
}

func WaitForAllocRunning(t *testing.T, nomadClient *api.Client, allocID string) {
	testutil.WaitForResultRetries(retries, func() (bool, error) {
		time.Sleep(time.Millisecond * 100)
		alloc, _, err := nomadClient.Allocations().Info(allocID, nil)
		if err != nil {
			return false, err
		}

		return alloc.ClientStatus == structs.AllocClientStatusRunning, fmt.Errorf("expected status running, but was: %s", alloc.ClientStatus)
	}, func(err error) {
		t.Fatalf("failed to wait on alloc: %v", err)
	})
}

func WaitForAllocsRunning(t *testing.T, nomadClient *api.Client, allocIDs []string) {
	for _, allocID := range allocIDs {
		WaitForAllocRunning(t, nomadClient, allocID)
	}
}

func WaitForAllocsNotPending(t *testing.T, nomadClient *api.Client, allocIDs []string) {
	for _, allocID := range allocIDs {
		WaitForAllocNotPending(t, nomadClient, allocID)
	}
}

func WaitForAllocNotPending(t *testing.T, nomadClient *api.Client, allocID string) {
	testutil.WaitForResultRetries(retries, func() (bool, error) {
		time.Sleep(time.Millisecond * 100)
		alloc, _, err := nomadClient.Allocations().Info(allocID, nil)
		if err != nil {
			return false, err
		}

		return alloc.ClientStatus != structs.AllocClientStatusPending, fmt.Errorf("expected status not pending, but was: %s", alloc.ClientStatus)
	}, func(err error) {
		t.Fatalf("failed to wait on alloc: %v", err)
	})
}

func WaitForAllocStopped(t *testing.T, nomadClient *api.Client, allocID string) {
	testutil.WaitForResultRetries(retries, func() (bool, error) {
		time.Sleep(time.Millisecond * 100)
		alloc, _, err := nomadClient.Allocations().Info(allocID, nil)
		if err != nil {
			return false, err
		}
		switch alloc.ClientStatus {
		case structs.AllocClientStatusComplete:
			return true, nil
		case structs.AllocClientStatusFailed:
			return true, nil
		case structs.AllocClientStatusLost:
			return true, nil
		default:
			return false, fmt.Errorf("expected stopped alloc, but was: %s",
				alloc.ClientStatus)
		}
	}, func(err error) {
		t.Fatalf("failed to wait on alloc: %v", err)
	})
}

func AllocIDsFromAllocationListStubs(allocs []*api.AllocationListStub) []string {
	allocIDs := make([]string, 0, len(allocs))
	for _, alloc := range allocs {
		allocIDs = append(allocIDs, alloc.ID)
	}
	return allocIDs
}

func DeploymentsForJob(t *testing.T, nomadClient *api.Client, jobID string) []*api.Deployment {
	ds, _, err := nomadClient.Deployments().List(nil)
	require.NoError(t, err)

	out := []*api.Deployment{}
	for _, d := range ds {
		if d.JobID == jobID {
			out = append(out, d)
		}
	}

	return out
}

func WaitForDeployment(t *testing.T, nomadClient *api.Client, deployID string, status string, statusDesc string) {
	testutil.WaitForResultRetries(retries, func() (bool, error) {
		time.Sleep(time.Millisecond * 100)
		deploy, _, err := nomadClient.Deployments().Info(deployID, nil)
		if err != nil {
			return false, err
		}

		if deploy.Status == status && deploy.StatusDescription == statusDesc {
			return true, nil
		}
		return false, fmt.Errorf("expected status %s \"%s\", but got: %s \"%s\"",
			status,
			statusDesc,
			deploy.Status,
			deploy.StatusDescription,
		)

	}, func(err error) {
		t.Fatalf("failed to wait on deployment: %v", err)
	})
}

// CheckServicesPassing scans for passing agent checks via the given agent API
// client.
//
// Deprecated: not useful in e2e, where more than one node exists and Nomad jobs
// are placed non-deterministically. The Consul agentAPI only knows about what
// is registered on its node, and cannot be used to query for cluster wide state.
func CheckServicesPassing(t *testing.T, agentAPI *consulapi.Agent, allocIDs []string) {
	failing := map[string]*consulapi.AgentCheck{}
	for i := 0; i < 60; i++ {
		checks, err := agentAPI.Checks()
		require.NoError(t, err)

		// Filter out checks for other services
		for cid, check := range checks {
			found := false
			for _, allocID := range allocIDs {
				if strings.Contains(check.ServiceID, allocID) {
					found = true
					break
				}
			}

			if !found {
				delete(checks, cid)
			}
		}

		// Ensure checks are all passing
		failing = map[string]*consulapi.AgentCheck{}
		for _, check := range checks {
			if check.Status != "passing" {
				failing[check.CheckID] = check
				break
			}
		}

		if len(failing) == 0 {
			break
		}

		t.Logf("still %d checks not passing", len(failing))

		time.Sleep(time.Second)
	}
	require.Len(t, failing, 0, pretty.Sprint(failing))
}