/*
Copyright 2011 Google Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package db

import (
	"strings"
	"testing"
)

func newTestDB(t *testing.T, name string) *DB {
	db, err := Open("test", "foo")
	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,dead=bool")
		exec(t, db, "INSERT|people|name=Alice,age=?", 1)
		exec(t, db, "INSERT|people|name=Bob,age=?", 2)
		exec(t, db, "INSERT|people|name=Chris,age=?", 3)

	}
	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 TestQuery(t *testing.T) {
	db := newTestDB(t, "people")
	var name string
	var age int

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

	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)
	}
}

func TestStatementQueryRow(t *testing.T) {
	db := newTestDB(t, "people")
	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", age, tt.want)
		}
	}

}

// just a test of fakedb itself
func TestBogusPreboundParameters(t *testing.T) {
	db := newTestDB(t, "foo")
	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.String() != `fakedb: invalid conversion to int32 from "bogusconversion"` {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestDb(t *testing.T) {
	db := newTestDB(t, "foo")
	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)}, "db: converting Exec column index 1: value 4294967295 overflows int32"},
		{[]interface{}{"Brad", "strconv fail"}, "db: converting Exec column index 1: value \"strconv fail\" can't be converted to int32"},

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