package api

import (
	"strings"
	"testing"
	"time"

	"github.com/hashicorp/go-uuid"

	"github.com/pascaldekloe/goe/verify"
	"github.com/stretchr/testify/require"
)

func TestAPI_ClientTxn(t *testing.T) {
	t.Parallel()
	require := require.New(t)
	c, s := makeClient(t)
	defer s.Stop()

	session := c.Session()
	txn := c.Txn()

	// Set up a test service and health check.
	nodeID, err := uuid.GenerateUUID()
	require.NoError(err)

	catalog := c.Catalog()
	reg := &CatalogRegistration{
		ID:      nodeID,
		Node:    "foo",
		Address: "2.2.2.2",
		Service: &AgentService{
			ID:      "foo1",
			Service: "foo",
		},
		Check: &AgentCheck{
			CheckID: "bar",
			Status:  "critical",
			Definition: HealthCheckDefinition{
				TCP:      "1.1.1.1",
				Interval: 5 * time.Second,
			},
		},
	}
	_, err = catalog.Register(reg, nil)
	require.NoError(err)

	node, _, err := catalog.Node("foo", nil)
	require.NoError(err)
	require.Equal(nodeID, node.Node.ID)

	// Make a session.
	id, _, err := session.CreateNoChecks(nil, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer session.Destroy(id, nil)

	// Acquire and get the key via a transaction, but don't supply a valid
	// session.
	key := testKey()
	value := []byte("test")
	ops := TxnOps{
		&TxnOp{
			KV: &KVTxnOp{
				Verb:  KVLock,
				Key:   key,
				Value: value,
			},
		},
		&TxnOp{
			KV: &KVTxnOp{
				Verb: KVGet,
				Key:  key,
			},
		},
		&TxnOp{
			Node: &NodeTxnOp{
				Verb: NodeGet,
				Node: Node{Node: "foo"},
			},
		},
		&TxnOp{
			Service: &ServiceTxnOp{
				Verb:    ServiceGet,
				Node:    "foo",
				Service: CatalogService{ServiceID: "foo1"},
			},
		},
		&TxnOp{
			Check: &CheckTxnOp{
				Verb:  CheckGet,
				Check: HealthCheck{Node: "foo", CheckID: "bar"},
			},
		},
	}
	ok, ret, _, err := txn.Txn(ops, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	} else if ok {
		t.Fatalf("transaction should have failed")
	}

	if ret == nil || len(ret.Errors) != 2 || len(ret.Results) != 0 {
		t.Fatalf("bad: %v", ret.Errors[2])
	}
	if ret.Errors[0].OpIndex != 0 ||
		!strings.Contains(ret.Errors[0].What, "missing session") ||
		!strings.Contains(ret.Errors[1].What, "doesn't exist") {
		t.Fatalf("bad: %v", ret.Errors[0])
	}

	// Now poke in a real session and try again.
	ops[0].KV.Session = id
	ok, ret, _, err = txn.Txn(ops, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	} else if !ok {
		t.Fatalf("transaction failure")
	}

	if ret == nil || len(ret.Errors) != 0 || len(ret.Results) != 5 {
		t.Fatalf("bad: %v", ret)
	}
	expected := TxnResults{
		&TxnResult{
			KV: &KVPair{
				Key:         key,
				Session:     id,
				LockIndex:   1,
				CreateIndex: ret.Results[0].KV.CreateIndex,
				ModifyIndex: ret.Results[0].KV.ModifyIndex,
			},
		},
		&TxnResult{
			KV: &KVPair{
				Key:         key,
				Session:     id,
				Value:       []byte("test"),
				LockIndex:   1,
				CreateIndex: ret.Results[1].KV.CreateIndex,
				ModifyIndex: ret.Results[1].KV.ModifyIndex,
			},
		},
		&TxnResult{
			Node: &Node{
				ID:          nodeID,
				Node:        "foo",
				Address:     "2.2.2.2",
				Datacenter:  "dc1",
				CreateIndex: ret.Results[2].Node.CreateIndex,
				ModifyIndex: ret.Results[2].Node.CreateIndex,
			},
		},
		&TxnResult{
			Service: &CatalogService{
				ID:          "foo1",
				CreateIndex: ret.Results[3].Service.CreateIndex,
				ModifyIndex: ret.Results[3].Service.CreateIndex,
			},
		},
		&TxnResult{
			Check: &HealthCheck{
				Node:    "foo",
				CheckID: "bar",
				Status:  "critical",
				Definition: HealthCheckDefinition{
					TCP:      "1.1.1.1",
					Interval: 5 * time.Second,
				},
				CreateIndex: ret.Results[4].Check.CreateIndex,
				ModifyIndex: ret.Results[4].Check.CreateIndex,
			},
		},
	}
	verify.Values(t, "", ret.Results, expected)

	// Run a read-only transaction.
	ops = TxnOps{
		&TxnOp{
			KV: &KVTxnOp{
				Verb: KVGet,
				Key:  key,
			},
		},
		&TxnOp{
			Node: &NodeTxnOp{
				Verb: NodeGet,
				Node: Node{ID: s.Config.NodeID, Node: s.Config.NodeName},
			},
		},
	}
	ok, ret, _, err = txn.Txn(ops, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	} else if !ok {
		t.Fatalf("transaction failure")
	}

	expected = TxnResults{
		&TxnResult{
			KV: &KVPair{
				Key:         key,
				Session:     id,
				Value:       []byte("test"),
				LockIndex:   1,
				CreateIndex: ret.Results[0].KV.CreateIndex,
				ModifyIndex: ret.Results[0].KV.ModifyIndex,
			},
		},
		&TxnResult{
			Node: &Node{
				ID:         s.Config.NodeID,
				Node:       s.Config.NodeName,
				Address:    "127.0.0.1",
				Datacenter: "dc1",
				TaggedAddresses: map[string]string{
					"lan": s.Config.Bind,
					"wan": s.Config.Bind,
				},
				Meta:        map[string]string{"consul-network-segment": ""},
				CreateIndex: ret.Results[1].Node.CreateIndex,
				ModifyIndex: ret.Results[1].Node.ModifyIndex,
			},
		},
	}
	verify.Values(t, "", ret.Results, expected)

	// Sanity check using the regular GET API.
	kv := c.KV()
	pair, meta, err := kv.Get(key, nil)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	if pair == nil {
		t.Fatalf("expected value: %#v", pair)
	}
	if pair.LockIndex != 1 {
		t.Fatalf("Expected lock: %v", pair)
	}
	if pair.Session != id {
		t.Fatalf("Expected lock: %v", pair)
	}
	if meta.LastIndex == 0 {
		t.Fatalf("unexpected value: %#v", meta)
	}
}