package store

import (
	"fmt"
	"testing"
	"time"

	"github.com/rqlite/rqlite/command"
)

func openStoreCloseStartup(t *testing.T, s *Store) {
	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	if err := s.Bootstrap(NewServer(s.ID(), s.Addr(), true)); err != nil {
		t.Fatalf("failed to bootstrap single-node store: %s", err.Error())
	}
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}
	er := executeRequestFromStrings([]string{
		`CREATE TABLE foo (id INTEGER NOT NULL PRIMARY KEY, name TEXT)`,
		`INSERT INTO foo(id, name) VALUES(1, "fiona")`,
	}, false, false)
	_, err := s.Execute(er)
	if err != nil {
		t.Fatalf("failed to execute on single node: %s", err.Error())
	}

	fsmIdx, err := s.WaitForAppliedFSM(5 * time.Second)
	if err != nil {
		t.Fatalf("failed to wait for fsmIndex: %s", err.Error())
	}

	if err := s.Close(true); err != nil {
		t.Fatalf("failed to close single-node store: %s", err.Error())
	}

	// Reopen it and confirm data still there.
	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}

	// Wait until the log entries have been applied to the voting follower,
	// and then query.
	if _, err := s.WaitForFSMIndex(fsmIdx, 5*time.Second); err != nil {
		t.Fatalf("error waiting for follower to apply index: %s:", err.Error())
	}

	qr := queryRequestFromString("SELECT * FROM foo", false, false)
	qr.Level = command.QueryRequest_QUERY_REQUEST_LEVEL_STRONG
	r, err := s.Query(qr)
	if err != nil {
		t.Fatalf("failed to query single node: %s", err.Error())
	}
	if exp, got := `["id","name"]`, asJSON(r[0].Columns); exp != got {
		t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
	}
	if exp, got := `[[1,"fiona"]]`, asJSON(r[0].Values); exp != got {
		t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
	}

	if err := s.Close(true); err != nil {
		t.Fatalf("failed to close single-node store: %s", err.Error())
	}

	// Tweak snapshot params to force a snap to take place.
	s.SnapshotThreshold = 4
	s.SnapshotInterval = 100 * time.Millisecond
	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}

	// Insert new records to trigger a snapshot.
	queryTest := func(s *Store, c int) {
		qr := queryRequestFromString("SELECT COUNT(*) FROM foo", false, false)
		qr.Level = command.QueryRequest_QUERY_REQUEST_LEVEL_STRONG
		r, err := s.Query(qr)
		if err != nil {
			t.Fatalf("failed to query single node: %s", err.Error())
		}
		if exp, got := `["COUNT(*)"]`, asJSON(r[0].Columns); exp != got {
			t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
		}
		if exp, got := fmt.Sprintf(`[[%d]]`, c), asJSON(r[0].Values); exp != got {
			t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
		}
	}
	for i := 0; i < 9; i++ {
		er := executeRequestFromStrings([]string{
			`INSERT INTO foo(name) VALUES("fiona")`,
		}, false, false)
		if _, err := s.Execute(er); err != nil {
			t.Fatalf("failed to execute on single node: %s", err.Error())
		}
	}
	queryTest(s, 10)

	// Wait for a snapshot to take place.
	for {
		time.Sleep(100 * time.Millisecond)
		s.numSnapshotsMu.Lock()
		ns := s.numSnapshots
		s.numSnapshotsMu.Unlock()
		if ns > 0 {
			break
		}
	}

	fsmIdx, err = s.WaitForAppliedFSM(5 * time.Second)
	if err != nil {
		t.Fatalf("failed to wait for fsmIndex: %s", err.Error())
	}

	// Close and re-open to make sure all continues to work with recovery from snapshot.
	if err := s.Close(true); err != nil {
		t.Fatalf("failed to close single-node store: %s", err.Error())
	}
	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}

	// Wait until the log entries have been applied to the voting follower,
	// and then query.
	if _, err := s.WaitForFSMIndex(fsmIdx, 5*time.Second); err != nil {
		t.Fatalf("error waiting for follower to apply index: %s:", err.Error())
	}

	qr = queryRequestFromString("SELECT COUNT(*) FROM foo", false, false)
	qr.Level = command.QueryRequest_QUERY_REQUEST_LEVEL_STRONG
	r, err = s.Query(qr)
	if err != nil {
		t.Fatalf("failed to query single node: %s", err.Error())
	}
	if exp, got := `[{"columns":["COUNT(*)"],"types":["integer"],"values":[[10]]}]`, asJSON(r); exp != got {
		t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
	}

	if err := s.Close(true); err != nil {
		t.Fatalf("failed to close single-node store: %s", err.Error())
	}

	// Set snapshot threshold high to effectively disable, reopen store, write
	// one more record, and then reopen again, ensure all data is there.
	s.SnapshotThreshold = 8192
	s.SnapshotInterval = 100 * time.Second

	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}
	_, err = s.Execute(executeRequestFromString(`INSERT INTO foo(name) VALUES("fiona")`, false, false))
	if err != nil {
		t.Fatalf("failed to execute on single node: %s", err.Error())
	}
	qr = queryRequestFromString("SELECT COUNT(*) FROM foo", false, false)
	r, err = s.Query(qr)
	if err != nil {
		t.Fatalf("failed to query single node: %s", err.Error())
	}
	if exp, got := `[{"columns":["COUNT(*)"],"types":["integer"],"values":[[11]]}]`, asJSON(r); exp != got {
		t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
	}

	fsmIdx, err = s.WaitForAppliedFSM(5 * time.Second)
	if err != nil {
		t.Fatalf("failed to wait for fsmIndex: %s", err.Error())
	}

	if err := s.Close(true); err != nil {
		t.Fatalf("failed to close single-node store: %s", err.Error())
	}
	if err := s.Open(); err != nil {
		t.Fatalf("failed to open single-node store: %s", err.Error())
	}
	defer s.Close(true)
	if _, err := s.WaitForLeader(10 * time.Second); err != nil {
		t.Fatalf("Error waiting for leader: %s", err)
	}

	// Wait until the log entries have been applied to the voting follower,
	// and then query.
	if _, err := s.WaitForFSMIndex(fsmIdx, 5*time.Second); err != nil {
		t.Fatalf("error waiting for follower to apply index: %s:", err.Error())
	}

	qr = queryRequestFromString("SELECT COUNT(*) FROM foo", false, false)
	qr.Level = command.QueryRequest_QUERY_REQUEST_LEVEL_STRONG
	r, err = s.Query(qr)
	if err != nil {
		t.Fatalf("failed to query single node: %s", err.Error())
	}
	if exp, got := `[{"columns":["COUNT(*)"],"types":["integer"],"values":[[11]]}]`, asJSON(r); exp != got {
		t.Fatalf("unexpected results for query\nexp: %s\ngot: %s", exp, got)
	}
}

// Test_OpenStoreCloseStartupOnDiskSingleNode tests that on-disk
// works fine during various restart scenarios.
func Test_OpenStoreCloseStartupOnDiskSingleNode(t *testing.T) {
	s, ln := mustNewStore(t, false)
	defer ln.Close()

	openStoreCloseStartup(t, s)
}

// Test_OpenStoreCloseStartupMemoryOnlySingleNode tests that in-memory
// works fine during various restart scenarios.
func Test_OpenStoreCloseStartupMemoryOnlySingleNode(t *testing.T) {
	s, ln := mustNewStore(t, true)
	defer ln.Close()

	openStoreCloseStartup(t, s)
}