package repo_test

import (
	"context"
	"database/sql"
	"errors"
	"os"
	"reflect"
	"testing"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/stdlib"
	_ "github.com/mattn/go-sqlite3"

	"code.uint32.ru/tiny/repo"
)

type My struct {
	A string
	B int
}

func TestSqlite3(t *testing.T) {
	db, err := sql.Open("sqlite3", "test.db")
	if err != nil {
		t.Fatal(err)
	}

	defer os.Remove("test.db")
	defer db.Close()

	ctx := context.Background()

	dotest(ctx, db, t)
}

func TestPGX(t *testing.T) {
	dsn, ok := os.LookupEnv("PGX_DSN")
	if !ok {
		t.SkipNow()
	}

	conf, err := pgx.ParseConfig(dsn)
	if err != nil {
		t.Fatal(err)
	}
	conf.DefaultQueryExecMode = pgx.QueryExecModeSimpleProtocol
	conf.DescriptionCacheCapacity = 0
	conf.StatementCacheCapacity = 0

	db, err := sql.Open("pgx", stdlib.RegisterConnConfig(conf))
	if err != nil {
		t.Fatal(err)
	}

	defer db.Close()

	ctx := context.Background()

	dotest(ctx, db, t)
}

func TestOpenOrCreateFails(t *testing.T) {
	ctx := context.Background()

	if _, err := repo.OpenOrCreate[My](ctx, nil, ""); err == nil {
		t.Errorf("must fail on empty tablename")
	}

	if _, err := repo.OpenOrCreate[My](ctx, nil, "test"); err == nil {
		t.Errorf("must fail on nil DB instance")
	}
}

func dotest(ctx context.Context, db *sql.DB, t *testing.T) {
	r, err := repo.OpenOrCreate[My](ctx, db, "my_test")
	if err != nil {
		t.Fatal(err)
	}

	testID := "watermelon"
	incorrectID := "surelynonexistant"

	one := &My{
		A: "hello",
		B: 42,
	}

	if err := r.Create(ctx, testID, one); err != nil {
		t.Fatal(err)
	}

	if err := r.Create(ctx, testID, one); err == nil {
		// can not insert with same id
		t.Errorf("insert of the same id dows not fail")
	}

	two, err := r.Read(ctx, testID)
	if err != nil {
		t.Fatal(err)
	}

	if !reflect.DeepEqual(one, two) {
		t.Errorf("instances are not equal")
		t.Logf("%+v", one)
		t.Logf("%+v", two)
	}

	one.B = 13

	if err := r.Update(ctx, testID, one); err != nil {
		t.Error(err)
	}

	two, err = r.Read(ctx, testID)
	if err != nil {
		t.Error(err)
	}

	if !reflect.DeepEqual(one, two) {
		t.Errorf("instances are not equal")
		t.Logf("%+v", one)
		t.Logf("%+v", two)
	}

	if err := r.Delete(ctx, testID); err != nil {
		t.Error(err)
	}

	if err := r.Delete(ctx, testID); err == nil || !errors.Is(err, repo.ErrNotFound) {
		// can only delete once
		t.Errorf("incorrect error on delete for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}

	if err := r.Purge(ctx, testID); err != nil {
		t.Error(err)
	}

	if err := r.Purge(ctx, testID); err == nil || !errors.Is(err, repo.ErrNotFound) {
		// can only purge once
		t.Errorf("incorrect error on delete for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}

	if _, err := r.Read(ctx, incorrectID); err == nil || !errors.Is(err, repo.ErrNotFound) {
		t.Errorf("incorrect error on read for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}

	if err := r.Update(ctx, incorrectID, one); err == nil || !errors.Is(err, repo.ErrNotFound) {
		t.Errorf("incorrect error on update for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}

	if err := r.Delete(ctx, incorrectID); err == nil || !errors.Is(err, repo.ErrNotFound) {
		t.Errorf("incorrect error on delete for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}

	if err := r.Purge(ctx, incorrectID); err == nil || !errors.Is(err, repo.ErrNotFound) {
		t.Errorf("incorrect error on purge for non-existing id, want: %v, have: %v", repo.ErrNotFound, err)
	}
}