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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package sql

import (
        "fmt"
        "reflect"
        "strings"
        "testing"
        "time"
)

const fakeDBName = "foo"

var chrisBirthday = time.Unix(123456789, 0)

func newTestDB(t *testing.T, name string) *DB {
        db, err := Open("test", fakeDBName)
        if err != nil {
                t.Fatalf("Open: %v", err)
        }
        if _, err := db.Exec("WIPE"); err != nil {
                t.Fatalf("exec wipe: %v", err)
        }
        if name == "people" {
                exec(t, db, "CREATE|people|name=string,age=int32,photo=blob,dead=bool,bdate=datetime")
                exec(t, db, "INSERT|people|name=Alice,age=?,photo=APHOTO", 1)
                exec(t, db, "INSERT|people|name=Bob,age=?,photo=BPHOTO", 2)
                exec(t, db, "INSERT|people|name=Chris,age=?,photo=CPHOTO,bdate=?", 3, chrisBirthday)
        }
        return db
}

func exec(t *testing.T, db *DB, query string, args ...interface{}) {
        _, err := db.Exec(query, args...)
        if err != nil {
                t.Fatalf("Exec of %q: %v", query, err)
        }
}

func closeDB(t *testing.T, db *DB) {
        err := db.Close()
        if err != nil {
                t.Fatalf("error closing DB: %v", err)
        }
}

func TestQuery(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        rows, err := db.Query("SELECT|people|age,name|")
        if err != nil {
                t.Fatalf("Query: %v", err)
        }
        type row struct {
                age  int
                name string
        }
        got := []row{}
        for rows.Next() {
                var r row
                err = rows.Scan(&r.age, &r.name)
                if err != nil {
                        t.Fatalf("Scan: %v", err)
                }
                got = append(got, r)
        }
        err = rows.Err()
        if err != nil {
                t.Fatalf("Err: %v", err)
        }
        want := []row{
                {age: 1, name: "Alice"},
                {age: 2, name: "Bob"},
                {age: 3, name: "Chris"},
        }
        if !reflect.DeepEqual(got, want) {
                t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
        }

        // And verify that the final rows.Next() call, which hit EOF,
        // also closed the rows connection.
        if n := len(db.freeConn); n != 1 {
                t.Errorf("free conns after query hitting EOF = %d; want 1", n)
        }
}

func TestByteOwnership(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        rows, err := db.Query("SELECT|people|name,photo|")
        if err != nil {
                t.Fatalf("Query: %v", err)
        }
        type row struct {
                name  []byte
                photo RawBytes
        }
        got := []row{}
        for rows.Next() {
                var r row
                err = rows.Scan(&r.name, &r.photo)
                if err != nil {
                        t.Fatalf("Scan: %v", err)
                }
                got = append(got, r)
        }
        corruptMemory := []byte("\xffPHOTO")
        want := []row{
                {name: []byte("Alice"), photo: corruptMemory},
                {name: []byte("Bob"), photo: corruptMemory},
                {name: []byte("Chris"), photo: corruptMemory},
        }
        if !reflect.DeepEqual(got, want) {
                t.Errorf("mismatch.\n got: %#v\nwant: %#v", got, want)
        }

        var photo RawBytes
        err = db.QueryRow("SELECT|people|photo|name=?", "Alice").Scan(&photo)
        if err == nil {
                t.Error("want error scanning into RawBytes from QueryRow")
        }
}

func TestRowsColumns(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        rows, err := db.Query("SELECT|people|age,name|")
        if err != nil {
                t.Fatalf("Query: %v", err)
        }
        cols, err := rows.Columns()
        if err != nil {
                t.Fatalf("Columns: %v", err)
        }
        want := []string{"age", "name"}
        if !reflect.DeepEqual(cols, want) {
                t.Errorf("got %#v; want %#v", cols, want)
        }
}

func TestQueryRow(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        var name string
        var age int
        var birthday time.Time

        err := db.QueryRow("SELECT|people|age,name|age=?", 3).Scan(&age)
        if err == nil || !strings.Contains(err.Error(), "expected 2 destination arguments") {
                t.Errorf("expected error from wrong number of arguments; actually got: %v", err)
        }

        err = db.QueryRow("SELECT|people|bdate|age=?", 3).Scan(&birthday)
        if err != nil || !birthday.Equal(chrisBirthday) {
                t.Errorf("chris birthday = %v, err = %v; want %v", birthday, err, chrisBirthday)
        }

        err = db.QueryRow("SELECT|people|age,name|age=?", 2).Scan(&age, &name)
        if err != nil {
                t.Fatalf("age QueryRow+Scan: %v", err)
        }
        if name != "Bob" {
                t.Errorf("expected name Bob, got %q", name)
        }
        if age != 2 {
                t.Errorf("expected age 2, got %d", age)
        }

        err = db.QueryRow("SELECT|people|age,name|name=?", "Alice").Scan(&age, &name)
        if err != nil {
                t.Fatalf("name QueryRow+Scan: %v", err)
        }
        if name != "Alice" {
                t.Errorf("expected name Alice, got %q", name)
        }
        if age != 1 {
                t.Errorf("expected age 1, got %d", age)
        }

        var photo []byte
        err = db.QueryRow("SELECT|people|photo|name=?", "Alice").Scan(&photo)
        if err != nil {
                t.Fatalf("photo QueryRow+Scan: %v", err)
        }
        want := []byte("APHOTO")
        if !reflect.DeepEqual(photo, want) {
                t.Errorf("photo = %q; want %q", photo, want)
        }
}

func TestStatementErrorAfterClose(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        stmt, err := db.Prepare("SELECT|people|age|name=?")
        if err != nil {
                t.Fatalf("Prepare: %v", err)
        }
        err = stmt.Close()
        if err != nil {
                t.Fatalf("Close: %v", err)
        }
        var name string
        err = stmt.QueryRow("foo").Scan(&name)
        if err == nil {
                t.Errorf("expected error from QueryRow.Scan after Stmt.Close")
        }
}

func TestStatementQueryRow(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        stmt, err := db.Prepare("SELECT|people|age|name=?")
        if err != nil {
                t.Fatalf("Prepare: %v", err)
        }
        var age int
        for n, tt := range []struct {
                name string
                want int
        }{
                {"Alice", 1},
                {"Bob", 2},
                {"Chris", 3},
        } {
                if err := stmt.QueryRow(tt.name).Scan(&age); err != nil {
                        t.Errorf("%d: on %q, QueryRow/Scan: %v", n, tt.name, err)
                } else if age != tt.want {
                        t.Errorf("%d: age=%d, want %d", n, age, tt.want)
                }
        }

}

// just a test of fakedb itself
func TestBogusPreboundParameters(t *testing.T) {
        db := newTestDB(t, "foo")
        defer closeDB(t, db)
        exec(t, db, "CREATE|t1|name=string,age=int32,dead=bool")
        _, err := db.Prepare("INSERT|t1|name=?,age=bogusconversion")
        if err == nil {
                t.Fatalf("expected error")
        }
        if err.Error() != `fakedb: invalid conversion to int32 from "bogusconversion"` {
                t.Errorf("unexpected error: %v", err)
        }
}

func TestExec(t *testing.T) {
        db := newTestDB(t, "foo")
        defer closeDB(t, db)
        exec(t, db, "CREATE|t1|name=string,age=int32,dead=bool")
        stmt, err := db.Prepare("INSERT|t1|name=?,age=?")
        if err != nil {
                t.Errorf("Stmt, err = %v, %v", stmt, err)
        }

        type execTest struct {
                args    []interface{}
                wantErr string
        }
        execTests := []execTest{
                // Okay:
                {[]interface{}{"Brad", 31}, ""},
                {[]interface{}{"Brad", int64(31)}, ""},
                {[]interface{}{"Bob", "32"}, ""},
                {[]interface{}{7, 9}, ""},

                // Invalid conversions:
                {[]interface{}{"Brad", int64(0xFFFFFFFF)}, "sql: converting Exec argument #1's type: sql/driver: value 4294967295 overflows int32"},
                {[]interface{}{"Brad", "strconv fail"}, "sql: converting Exec argument #1's type: sql/driver: value \"strconv fail\" can't be converted to int32"},

                // Wrong number of args:
                {[]interface{}{}, "sql: expected 2 arguments, got 0"},
                {[]interface{}{1, 2, 3}, "sql: expected 2 arguments, got 3"},
        }
        for n, et := range execTests {
                _, err := stmt.Exec(et.args...)
                errStr := ""
                if err != nil {
                        errStr = err.Error()
                }
                if errStr != et.wantErr {
                        t.Errorf("stmt.Execute #%d: for %v, got error %q, want error %q",
                                n, et.args, errStr, et.wantErr)
                }
        }
}

func TestTxStmt(t *testing.T) {
        db := newTestDB(t, "")
        defer closeDB(t, db)
        exec(t, db, "CREATE|t1|name=string,age=int32,dead=bool")
        stmt, err := db.Prepare("INSERT|t1|name=?,age=?")
        if err != nil {
                t.Fatalf("Stmt, err = %v, %v", stmt, err)
        }
        tx, err := db.Begin()
        if err != nil {
                t.Fatalf("Begin = %v", err)
        }
        _, err = tx.Stmt(stmt).Exec("Bobby", 7)
        if err != nil {
                t.Fatalf("Exec = %v", err)
        }
        err = tx.Commit()
        if err != nil {
                t.Fatalf("Commit = %v", err)
        }
}

// Issue: http://golang.org/issue/2784
// This test didn't fail before because we got luckly with the fakedb driver.
// It was failing, and now not, in github.com/bradfitz/go-sql-test
func TestTxQuery(t *testing.T) {
        db := newTestDB(t, "")
        defer closeDB(t, db)
        exec(t, db, "CREATE|t1|name=string,age=int32,dead=bool")
        exec(t, db, "INSERT|t1|name=Alice")

        tx, err := db.Begin()
        if err != nil {
                t.Fatal(err)
        }
        defer tx.Rollback()

        r, err := tx.Query("SELECT|t1|name|")
        if err != nil {
                t.Fatal(err)
        }

        if !r.Next() {
                if r.Err() != nil {
                        t.Fatal(r.Err())
                }
                t.Fatal("expected one row")
        }

        var x string
        err = r.Scan(&x)
        if err != nil {
                t.Fatal(err)
        }
}

// Tests fix for issue 2542, that we release a lock when querying on
// a closed connection.
func TestIssue2542Deadlock(t *testing.T) {
        db := newTestDB(t, "people")
        closeDB(t, db)
        for i := 0; i < 2; i++ {
                _, err := db.Query("SELECT|people|age,name|")
                if err == nil {
                        t.Fatalf("expected error")
                }
        }
}

// Tests fix for issue 2788, that we bind nil to a []byte if the
// value in the column is sql null
func TestNullByteSlice(t *testing.T) {
        db := newTestDB(t, "")
        defer closeDB(t, db)
        exec(t, db, "CREATE|t|id=int32,name=nullstring")
        exec(t, db, "INSERT|t|id=10,name=?", nil)

        var name []byte

        err := db.QueryRow("SELECT|t|name|id=?", 10).Scan(&name)
        if err != nil {
                t.Fatal(err)
        }
        if name != nil {
                t.Fatalf("name []byte should be nil for null column value, got: %#v", name)
        }

        exec(t, db, "INSERT|t|id=11,name=?", "bob")
        err = db.QueryRow("SELECT|t|name|id=?", 11).Scan(&name)
        if err != nil {
                t.Fatal(err)
        }
        if string(name) != "bob" {
                t.Fatalf("name []byte should be bob, got: %q", string(name))
        }
}

func TestQueryRowClosingStmt(t *testing.T) {
        db := newTestDB(t, "people")
        defer closeDB(t, db)
        var name string
        var age int
        err := db.QueryRow("SELECT|people|age,name|age=?", 3).Scan(&age, &name)
        if err != nil {
                t.Fatal(err)
        }
        if len(db.freeConn) != 1 {
                t.Fatalf("expected 1 free conn")
        }
        fakeConn := db.freeConn[0].(*fakeConn)
        if made, closed := fakeConn.stmtsMade, fakeConn.stmtsClosed; made != closed {
                t.Errorf("statement close mismatch: made %d, closed %d", made, closed)
        }
}

type nullTestRow struct {
        nullParam    interface{}
        notNullParam interface{}
        scanNullVal  interface{}
}

type nullTestSpec struct {
        nullType    string
        notNullType string
        rows        [6]nullTestRow
}

func TestNullStringParam(t *testing.T) {
        spec := nullTestSpec{"nullstring", "string", [6]nullTestRow{
                nullTestRow{NullString{"aqua", true}, "", NullString{"aqua", true}},
                nullTestRow{NullString{"brown", false}, "", NullString{"", false}},
                nullTestRow{"chartreuse", "", NullString{"chartreuse", true}},
                nullTestRow{NullString{"darkred", true}, "", NullString{"darkred", true}},
                nullTestRow{NullString{"eel", false}, "", NullString{"", false}},
                nullTestRow{"foo", NullString{"black", false}, nil},
        }}
        nullTestRun(t, spec)
}

func TestNullInt64Param(t *testing.T) {
        spec := nullTestSpec{"nullint64", "int64", [6]nullTestRow{
                nullTestRow{NullInt64{31, true}, 1, NullInt64{31, true}},
                nullTestRow{NullInt64{-22, false}, 1, NullInt64{0, false}},
                nullTestRow{22, 1, NullInt64{22, true}},
                nullTestRow{NullInt64{33, true}, 1, NullInt64{33, true}},
                nullTestRow{NullInt64{222, false}, 1, NullInt64{0, false}},
                nullTestRow{0, NullInt64{31, false}, nil},
        }}
        nullTestRun(t, spec)
}

func TestNullFloat64Param(t *testing.T) {
        spec := nullTestSpec{"nullfloat64", "float64", [6]nullTestRow{
                nullTestRow{NullFloat64{31.2, true}, 1, NullFloat64{31.2, true}},
                nullTestRow{NullFloat64{13.1, false}, 1, NullFloat64{0, false}},
                nullTestRow{-22.9, 1, NullFloat64{-22.9, true}},
                nullTestRow{NullFloat64{33.81, true}, 1, NullFloat64{33.81, true}},
                nullTestRow{NullFloat64{222, false}, 1, NullFloat64{0, false}},
                nullTestRow{10, NullFloat64{31.2, false}, nil},
        }}
        nullTestRun(t, spec)
}

func TestNullBoolParam(t *testing.T) {
        spec := nullTestSpec{"nullbool", "bool", [6]nullTestRow{
                nullTestRow{NullBool{false, true}, true, NullBool{false, true}},
                nullTestRow{NullBool{true, false}, false, NullBool{false, false}},
                nullTestRow{true, true, NullBool{true, true}},
                nullTestRow{NullBool{true, true}, false, NullBool{true, true}},
                nullTestRow{NullBool{true, false}, true, NullBool{false, false}},
                nullTestRow{true, NullBool{true, false}, nil},
        }}
        nullTestRun(t, spec)
}

func nullTestRun(t *testing.T, spec nullTestSpec) {
        db := newTestDB(t, "")
        defer closeDB(t, db)
        exec(t, db, fmt.Sprintf("CREATE|t|id=int32,name=string,nullf=%s,notnullf=%s", spec.nullType, spec.notNullType))

        // Inserts with db.Exec:
        exec(t, db, "INSERT|t|id=?,name=?,nullf=?,notnullf=?", 1, "alice", spec.rows[0].nullParam, spec.rows[0].notNullParam)
        exec(t, db, "INSERT|t|id=?,name=?,nullf=?,notnullf=?", 2, "bob", spec.rows[1].nullParam, spec.rows[1].notNullParam)

        // Inserts with a prepared statement:
        stmt, err := db.Prepare("INSERT|t|id=?,name=?,nullf=?,notnullf=?")
        if err != nil {
                t.Fatalf("prepare: %v", err)
        }
        if _, err := stmt.Exec(3, "chris", spec.rows[2].nullParam, spec.rows[2].notNullParam); err != nil {
                t.Errorf("exec insert chris: %v", err)
        }
        if _, err := stmt.Exec(4, "dave", spec.rows[3].nullParam, spec.rows[3].notNullParam); err != nil {
                t.Errorf("exec insert dave: %v", err)
        }
        if _, err := stmt.Exec(5, "eleanor", spec.rows[4].nullParam, spec.rows[4].notNullParam); err != nil {
                t.Errorf("exec insert eleanor: %v", err)
        }

        // Can't put null val into non-null col
        if _, err := stmt.Exec(6, "bob", spec.rows[5].nullParam, spec.rows[5].notNullParam); err == nil {
                t.Errorf("expected error inserting nil val with prepared statement Exec")
        }

        _, err = db.Exec("INSERT|t|id=?,name=?,nullf=?", 999, nil, nil)
        if err == nil {
                // TODO: this test fails, but it's just because
                // fakeConn implements the optional Execer interface,
                // so arguably this is the correct behavior.  But
                // maybe I should flesh out the fakeConn.Exec
                // implementation so this properly fails.
                // t.Errorf("expected error inserting nil name with Exec")
        }

        paramtype := reflect.TypeOf(spec.rows[0].nullParam)
        bindVal := reflect.New(paramtype).Interface()

        for i := 0; i < 5; i++ {
                id := i + 1
                if err := db.QueryRow("SELECT|t|nullf|id=?", id).Scan(bindVal); err != nil {
                        t.Errorf("id=%d Scan: %v", id, err)
                }
                bindValDeref := reflect.ValueOf(bindVal).Elem().Interface()
                if !reflect.DeepEqual(bindValDeref, spec.rows[i].scanNullVal) {
                        t.Errorf("id=%d got %#v, want %#v", id, bindValDeref, spec.rows[i].scanNullVal)
                }
        }
}