package dal

import (
	"database/sql"
	"database/sql/driver"
	"reflect"
	"testing"
	"time"

	"git.rosemyrtle.work/personal-finance/server/internal/entity"
	"git.rosemyrtle.work/personal-finance/server/internal/golang"
	"github.com/DATA-DOG/go-sqlmock"
	"github.com/google/uuid"
	"github.com/shopspring/decimal"
)

func TestDalImpl_Transaction(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	date := time.Now()

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		transactionId int64
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		mocks   [][]driver.Value
		want    *entity.Transaction
		wantErr bool
	}{
		{
			"SelectTransaction",
			fields{db},
			args{1},
			[][]driver.Value{
				{1, date, "income", 1000, nil},
			},
			&entity.Transaction{Id: 1, Date: date, Description: "income", Value: decimal.NewFromInt(1000)},
			false,
		},
		{
			"SelectTransactionWithCategory",
			fields{db},
			args{1},
			[][]driver.Value{
				{1, date, "income", 1000, "C1"},
			},
			&entity.Transaction{Id: 1, Date: date, Description: "income", Value: decimal.NewFromInt(1000), Category: golang.Ptr("C1")},
			false,
		},
		{
			"SelectNoTransaction", fields{db}, args{2}, nil, nil, false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			d := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery(`
					^SELECT \w+\.id, \w+\.date, \w+\.description, \w+\.amount, \w+\.name
					FROM \w+\.transactions \w+
					LEFT JOIN \w+\.transactions_categorized \w+
					ON \w+\.id = \w+\.id
					WHERE \w+\.id = \$1$`).
				WithArgs(tt.args.transactionId).
				WillReturnRows(
					mock.NewRows([]string{"id", "date", "description", "amount", "category"}).AddRows(tt.mocks...),
				)

			got, err := d.Transaction(tt.args.transactionId)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.Transaction() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.Transaction() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_Transactions(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	date := time.Now()

	type fields struct {
		Db *sql.DB
	}
	tests := []struct {
		name    string
		fields  fields
		mocks   [][]driver.Value
		want    entity.Transactions
		wantErr bool
	}{
		{
			"SelectTransactions",
			fields{db},
			[][]driver.Value{
				{1, date, "income", 1000, nil},
				{2, date, "expense", -10.50, nil},
			},
			entity.Transactions{
				{Id: 1, Date: date, Description: "income", Value: decimal.NewFromInt(1000)},
				{Id: 2, Date: date, Description: "expense", Value: decimal.NewFromFloat(-10.50)},
			},
			false,
		},
		{
			"SelectTransactionsWithCategory",
			fields{db},
			[][]driver.Value{
				{1, date, "income", 1000, "C1"},
				{2, date, "expense", -10.50, nil},
			},
			entity.Transactions{
				{Id: 1, Date: date, Description: "income", Value: decimal.NewFromInt(1000), Category: golang.Ptr("C1")},
				{Id: 2, Date: date, Description: "expense", Value: decimal.NewFromFloat(-10.50)},
			},
			false,
		},
		{
			"SelectNoTransactions", fields{db}, nil, nil, false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dal := &DalImpl{
				Db: tt.fields.Db,
			}

			limit, offset := 0, 0

			mock.
				ExpectQuery(`
					^SELECT \w+\.id, \w+\.date, \w+\.description, \w+\.amount, \w+\.name
					FROM \w+\.transactions \w+
					LEFT JOIN \w+\.transactions_categorized \w+
					ON \w+\.id = \w+\.id
					ORDER BY \w+\.date DESC
					LIMIT \$1
					OFFSET \$2`).
				WithArgs(limit, offset).
				WillReturnRows(
					mock.NewRows([]string{"id", "date", "description", "amount", "category"}).AddRows(tt.mocks...),
				)

			got, err := dal.Transactions(limit, offset, nil)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.Transactions() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.Transactions() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_Bank(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}

	uuid := uuid.New()

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		bankId string
		rows   [][]driver.Value
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		want    *entity.Bank
		wantErr bool
	}{
		{
			"200",
			fields{db},
			args{
				"Bank A",
				[][]driver.Value{
					{"Bank A", "Bank A", uuid.String()},
				}},
			&entity.Bank{Id: "Bank A", Name: "Bank A", NordigenId: uuid},
			false,
		},
		{"404", fields{db}, args{"Bank B", nil}, nil, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			d := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery("^SELECT .* FROM .*banks b JOIN .*banks_nordigen n ON b.name = n.name WHERE b.name = \\$1$").
				WithArgs(tt.args.bankId).
				WillReturnRows(
					mock.
						NewRows([]string{"name", "name", "requisition_id"}).
						AddRows(tt.args.rows...),
				)

			got, err := d.Bank(tt.args.bankId)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.Bank() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.Bank() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_Banks(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}

	uuid := uuid.New()

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		rows [][]driver.Value
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		want    entity.Banks
		wantErr bool
	}{
		{
			"200",
			fields{db},
			args{[][]driver.Value{
				{"Bank A", "Bank A", uuid.String()},
				{"Bank B", "Bank B", uuid.String()},
			}},
			entity.Banks{
				{Id: "Bank A", Name: "Bank A", NordigenId: uuid},
				{Id: "Bank B", Name: "Bank B", NordigenId: uuid},
			},
			false,
		},
		{"204", fields{db}, args{}, nil, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			d := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery("^SELECT .* FROM .*banks b JOIN .*banks_nordigen n ON b.name = n.name$").
				WithoutArgs().
				WillReturnRows(
					mock.
						NewRows([]string{"name", "name", "requisition_id"}).
						AddRows(tt.args.rows...),
				)

			got, err := d.Banks()
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.Banks() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.Banks() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_InsertTransaction(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}
	date := time.Now()

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		t entity.Transaction
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		want    entity.Transaction
		wantErr bool
	}{
		{
			"201",
			fields{db},
			args{entity.Transaction{Id: entity.InvalidId, Date: date, Description: "freedom", Value: decimal.NewFromInt(9000)}},
			entity.Transaction{Id: 1, Date: date, Description: "freedom", Value: decimal.NewFromInt(9000)},
			false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dal := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery(`
					INSERT INTO .* \(date, description, amount\)
					VALUES \(\$1, \$2, \$3\)
					RETURNING id`).
				WithArgs(tt.args.t.Date, tt.args.t.Description, tt.args.t.Value).
				WillReturnRows(
					mock.NewRows([]string{"id"}).
						AddRows([]driver.Value{tt.want.Id}),
				)

			got, err := dal.InsertTransaction(tt.args.t)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.InsertTransaction() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.InsertTransaction() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_UpdateTransaction(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		id       entity.TransactionId
		category *entity.CategoryName
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		mocks   driver.Result
		want    bool
		wantErr bool
	}{
		{
			"SuccessfulUpdate",
			fields{db},
			args{id: entity.InvalidId, category: golang.Ptr("C1")},
			sqlmock.NewResult(0, 1),
			true,
			false,
		},
		{
			"UnsuccessfulUpdate",
			fields{db},
			args{id: entity.InvalidId, category: golang.Ptr("C1")},
			sqlmock.NewResult(0, 0),
			false,
			true,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dal := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectExec(`
					UPDATE \w+\.transactions_categorized
					SET name = \$2
					WHERE id = \$1`).
				WithArgs(tt.args.id, tt.args.category).
				WillReturnResult(tt.mocks)

			got, err := dal.UpdateTransaction(tt.args.id, tt.args.category)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.UpdateTransaction() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.UpdateTransaction() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_TransactionExists(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}

	type fields struct {
		Db *sql.DB
	}
	type args struct {
		id uint64
	}
	tests := []struct {
		name    string
		fields  fields
		args    args
		want    bool
		wantErr bool
	}{
		{"TransactionExists", fields{db}, args{1}, true, false},
		{"TransactionNotExists", fields{db}, args{1}, false, false},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dal := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery(`
					SELECT EXISTS\(
						SELECT 1
						FROM pfbudget.transactions
						WHERE id = \$1
					\)`).
				WithArgs(tt.args.id).
				WillReturnRows(
					mock.NewRows([]string{"exists"}).
						AddRows([]driver.Value{tt.want}),
				)

			got, err := dal.TransactionExists(tt.args.id)
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.TransactionExists() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if got != tt.want {
				t.Errorf("DalImpl.TransactionExists() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestDalImpl_Categories(t *testing.T) {
	db, mock, err := sqlmock.New()
	if err != nil {
		t.Fatal(err)
	}

	type fields struct {
		Db *sql.DB
	}
	tests := []struct {
		name    string
		fields  fields
		mocks   [][]driver.Value
		want    entity.Categories
		wantErr bool
	}{
		{
			"SelectCategories",
			fields{db},
			[][]driver.Value{{"C1", "G1"}},
			entity.Categories{{Name: "C1", Group: golang.Ptr("G1")}},
			false,
		},
		{
			"SelectMutipleCategories",
			fields{db},
			[][]driver.Value{{"C1", "G1"}, {"C2", nil}},
			entity.Categories{{Name: "C1", Group: golang.Ptr("G1")}, {Name: "C2"}},
			false,
		},
		{
			"SelectNoCategories",
			fields{db},
			[][]driver.Value{},
			nil,
			false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dal := &DalImpl{
				Db: tt.fields.Db,
			}

			mock.
				ExpectQuery(`SELECT \w+\.name, \w+\.group FROM \w+.categories \w+`).
				WithoutArgs().
				WillReturnRows(mock.NewRows([]string{"name", "group"}).AddRows(tt.mocks...))

			got, err := dal.Categories()
			if (err != nil) != tt.wantErr {
				t.Errorf("DalImpl.Categories() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if !reflect.DeepEqual(got, tt.want) {
				t.Errorf("DalImpl.Categories() = %v, want %v", got, tt.want)
			}
		})
	}
}