package store

import (
	"context"
	"errors"
	"testing"

	"github.com/easyai/easyai-ai-gateway/apps/api/internal/auth"
	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgconn"
	"golang.org/x/crypto/bcrypt"
)

func TestVerifyLocalAPIKeyClosesCandidateRowsBeforeUpdatingUsage(t *testing.T) {
	secret := "sk-gw-matching-secret"
	wrongHash, err := bcrypt.GenerateFromPassword([]byte("sk-gw-different-secret"), bcrypt.MinCost)
	if err != nil {
		t.Fatalf("hash non-matching API key: %v", err)
	}
	matchingHash, err := bcrypt.GenerateFromPassword([]byte(secret), bcrypt.MinCost)
	if err != nil {
		t.Fatalf("hash matching API key: %v", err)
	}
	rows := &fakeLocalAPIKeyRows{candidates: []localAPIKeyCandidate{
		{apiKeyID: "wrong-key", hash: string(wrongHash), keyPrefix: apiKeyPrefix(secret)},
		{
			apiKeyID:        "matching-key",
			hash:            string(matchingHash),
			keyPrefix:       apiKeyPrefix(secret),
			keyName:         "Matching key",
			scopesBytes:     []byte(`["chat"]`),
			userGroupID:     "group-id",
			gatewayUserID:   "user-id",
			username:        "api-key-user",
			rolesBytes:      []byte(`["user"]`),
			gatewayTenantID: "gateway-tenant-id",
			tenantID:        "tenant-id",
			tenantKey:       "tenant-key",
		},
	}}
	database := &fakeLocalAPIKeyDatabase{rows: rows}

	user, err := verifyLocalAPIKey(context.Background(), database, secret)
	if err != nil {
		t.Fatalf("verify local API key: %v", err)
	}
	if !rows.closed {
		t.Fatal("candidate rows remained open after API key verification")
	}
	if database.updatedAPIKeyID != "matching-key" {
		t.Fatalf("updated API key = %q, want matching-key", database.updatedAPIKeyID)
	}
	if user.APIKeyID != "matching-key" || user.GatewayUserID != "user-id" {
		t.Fatalf("verified user = %+v", user)
	}
}

func TestVerifyLocalAPIKeyReturnsUnauthorizedAfterClosingCandidateRows(t *testing.T) {
	secret := "sk-gw-unknown-secret"
	wrongHash, err := bcrypt.GenerateFromPassword([]byte("sk-gw-different-secret"), bcrypt.MinCost)
	if err != nil {
		t.Fatalf("hash non-matching API key: %v", err)
	}
	rows := &fakeLocalAPIKeyRows{candidates: []localAPIKeyCandidate{{
		apiKeyID: "wrong-key",
		hash:     string(wrongHash),
	}}}
	database := &fakeLocalAPIKeyDatabase{rows: rows}

	_, err = verifyLocalAPIKey(context.Background(), database, secret)
	if !errors.Is(err, auth.ErrUnauthorized) {
		t.Fatalf("verify error = %v, want unauthorized", err)
	}
	if !rows.closed {
		t.Fatal("candidate rows remained open after unsuccessful API key verification")
	}
	if database.updatedAPIKeyID != "" {
		t.Fatalf("unexpected API key usage update for %q", database.updatedAPIKeyID)
	}
}

type fakeLocalAPIKeyDatabase struct {
	rows            *fakeLocalAPIKeyRows
	updatedAPIKeyID string
}

func (database *fakeLocalAPIKeyDatabase) Query(context.Context, string, ...any) (pgx.Rows, error) {
	return database.rows, nil
}

func (database *fakeLocalAPIKeyDatabase) Exec(_ context.Context, _ string, arguments ...any) (pgconn.CommandTag, error) {
	if !database.rows.closed {
		return pgconn.CommandTag{}, errors.New("API key usage update started before candidate rows closed")
	}
	database.updatedAPIKeyID, _ = arguments[0].(string)
	return pgconn.NewCommandTag("UPDATE 1"), nil
}

type fakeLocalAPIKeyRows struct {
	candidates []localAPIKeyCandidate
	current    int
	closed     bool
}

func (rows *fakeLocalAPIKeyRows) Close() {
	rows.closed = true
}

func (rows *fakeLocalAPIKeyRows) Err() error {
	return nil
}

func (rows *fakeLocalAPIKeyRows) CommandTag() pgconn.CommandTag {
	return pgconn.CommandTag{}
}

func (rows *fakeLocalAPIKeyRows) FieldDescriptions() []pgconn.FieldDescription {
	return nil
}

func (rows *fakeLocalAPIKeyRows) Next() bool {
	if rows.current >= len(rows.candidates) {
		rows.Close()
		return false
	}
	rows.current++
	return true
}

func (rows *fakeLocalAPIKeyRows) Scan(destinations ...any) error {
	candidate := rows.candidates[rows.current-1]
	values := []any{
		candidate.apiKeyID,
		candidate.hash,
		candidate.keyPrefix,
		candidate.keyName,
		candidate.scopesBytes,
		candidate.userGroupID,
		candidate.gatewayUserID,
		candidate.username,
		candidate.rolesBytes,
		candidate.gatewayTenantID,
		candidate.tenantID,
		candidate.tenantKey,
	}
	for index, value := range values {
		switch destination := destinations[index].(type) {
		case *string:
			*destination = value.(string)
		case *[]byte:
			*destination = value.([]byte)
		default:
			return errors.New("unsupported fake row destination")
		}
	}
	return nil
}

func (rows *fakeLocalAPIKeyRows) Values() ([]any, error) {
	return nil, errors.New("not implemented")
}

func (rows *fakeLocalAPIKeyRows) RawValues() [][]byte {
	return nil
}

func (rows *fakeLocalAPIKeyRows) Conn() *pgx.Conn {
	return nil
}