//go:build integration

package store

import (
	"context"
	"database/sql"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/cosmic-clash/cosmic-clash/server/domain"
	_ "github.com/jackc/pgx/v5/stdlib"
)

// This binary is deliberately opt-in. It requires a disposable PostgreSQL
// instance supplied by scripts/run_postgres_integration.sh.
func openIntegrationPostgres(t *testing.T) *sql.DB {
	t.Helper()
	dsn := os.Getenv("COSMIC_CLASH_POSTGRES_DSN")
	if dsn == "" {
		t.Skip("COSMIC_CLASH_POSTGRES_DSN is not set")
	}
	db, err := sql.Open("pgx", dsn)
	if err != nil {
		t.Fatalf("open PostgreSQL: %v", err)
	}
	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
	defer cancel()
	if err := db.PingContext(ctx); err != nil {
		db.Close()
		t.Fatalf("ping PostgreSQL: %v", err)
	}
	t.Cleanup(func() { db.Close() })
	return db
}

func applyIntegrationMigrations(t *testing.T, db *sql.DB) {
	t.Helper()
	if _, err := db.ExecContext(context.Background(), `DROP TABLE IF EXISTS assignments, audit_events, outbox, result_receipts, ranked_season_rollovers, penalties, seasons, ratings, match_participants, matches, proposal_participants, proposals, queue_tickets, idempotency_keys, sessions, identities CASCADE`); err != nil {
		t.Fatalf("reset PostgreSQL schema: %v", err)
	}
	for _, name := range []string{"0001_initial.sql", "0002_assignments.sql"} {
		path := filepath.Join("..", "migrations", name)
		sqlBytes, err := os.ReadFile(path)
		if err != nil {
			t.Fatal(err)
		}
		if _, err := db.ExecContext(context.Background(), string(sqlBytes)); err != nil {
			t.Fatalf("apply %s: %v", name, err)
		}
	}
}

func TestPostgreSQLQueueAdapterAgainstRealDatabase(t *testing.T) {
	db := openIntegrationPostgres(t)
	applyIntegrationMigrations(t, db)

	now := time.Now().UTC().Truncate(time.Microsecond)
	ctx := context.Background()
	if _, err := db.ExecContext(ctx, `INSERT INTO identities (player_id, steam_id) VALUES ('integration-player', 'integration-steam')`); err != nil {
		t.Fatal(err)
	}
	spec := domain.QueueSpec{Playlist: domain.Casual, ClientBuild: "integration-build", ProtocolVersion: 1}
	ticket, err := CreateQueueTicket(ctx, db, "integration-ticket", "integration-player", "integration-create-0001", spec, now)
	if err != nil {
		t.Fatalf("create queue ticket: %v", err)
	}
	if ticket.State != domain.Queued || ticket.Revision != 0 {
		t.Fatalf("unexpected ticket: %+v", ticket)
	}
	replay, err := CreateQueueTicket(ctx, db, "integration-ticket", "integration-player", "integration-create-0001", spec, now.Add(time.Second))
	if err != nil {
		t.Fatalf("idempotent queue replay: %v", err)
	}
	if replay.TicketID != ticket.TicketID || !replay.ExpiresAt.Equal(ticket.ExpiresAt) {
		t.Fatalf("replay changed durable result: %+v vs %+v", replay, ticket)
	}
	if _, err := CreateQueueTicket(ctx, db, "integration-ticket-2", "integration-player", "integration-create-0002", spec, now); err == nil {
		t.Fatal("second active player ticket was accepted")
	}
	if _, err := GetQueueTicket(ctx, db, "integration-player", "integration-ticket", now); err != nil {
		t.Fatalf("owner recovery: %v", err)
	}
	if _, err := GetQueueTicket(ctx, db, "other-player", "integration-ticket", now); err == nil {
		t.Fatal("non-owner recovered queue ticket")
	}
}

func TestPostgreSQLQueueHeartbeatAndCancelAreRevisionFenced(t *testing.T) {
	db := openIntegrationPostgres(t)
	applyIntegrationMigrations(t, db)

	now := time.Now().UTC().Truncate(time.Microsecond)
	ctx := context.Background()
	if _, err := db.ExecContext(ctx, `INSERT INTO identities (player_id, steam_id) VALUES ('heartbeat-player', 'heartbeat-steam')`); err != nil {
		t.Fatal(err)
	}
	spec := domain.QueueSpec{Playlist: domain.Ranked, ClientBuild: "integration-build", ProtocolVersion: 1}
	if _, err := CreateQueueTicket(ctx, db, "heartbeat-ticket", "heartbeat-player", "heartbeat-create-0001", spec, now); err != nil {
		t.Fatal(err)
	}
	heartbeat, err := HeartbeatQueueTicket(ctx, db, "heartbeat-player", "heartbeat-ticket", "heartbeat-op-0000001", 0, now.Add(5*time.Second))
	if err != nil {
		t.Fatalf("heartbeat: %v", err)
	}
	if heartbeat.Revision != 1 || !heartbeat.ExpiresAt.Equal(now.Add(35*time.Second)) {
		t.Fatalf("unexpected heartbeat result: %+v", heartbeat)
	}
	if _, err := HeartbeatQueueTicket(ctx, db, "heartbeat-player", "heartbeat-ticket", "heartbeat-op-0000002", 0, now.Add(6*time.Second)); err == nil {
		t.Fatal("stale heartbeat revision was accepted")
	}
	cancelled, err := CancelQueueTicket(ctx, db, "heartbeat-player", "heartbeat-ticket", "heartbeat-op-0000003", 1, now.Add(7*time.Second))
	if err != nil {
		t.Fatalf("cancel: %v", err)
	}
	if cancelled.State != domain.Cancelled || cancelled.Revision != 2 {
		t.Fatalf("unexpected cancellation result: %+v", cancelled)
	}
}

func TestPostgreSQLAssignmentPersistenceIsPlayerScopedAndExpiryBound(t *testing.T) {
	db := openIntegrationPostgres(t)
	applyIntegrationMigrations(t, db)

	now := time.Now().UTC().Truncate(time.Microsecond)
	ctx := context.Background()
	for _, player := range []string{"assignment-player", "assignment-other"} {
		if _, err := db.ExecContext(ctx, `INSERT INTO identities (player_id, steam_id) VALUES ($1, $1)`, player); err != nil {
			t.Fatal(err)
		}
	}
	if _, err := db.ExecContext(ctx, `INSERT INTO queue_tickets (ticket_id, player_id, playlist, state, client_build, protocol_version, enqueued_at, expires_at) VALUES ('assignment-ticket', 'assignment-player', 'casual', 'ASSIGNED', 'integration-build', 1, $1, $2)`, now, now.Add(time.Minute)); err != nil {
		t.Fatal(err)
	}
	if _, err := db.ExecContext(ctx, `INSERT INTO matches (match_id, playlist, state, region, protocol_version, server_id) VALUES ('assignment-match', 'casual', 'ASSIGNED', 'EU', 1, 'assignment-server')`); err != nil {
		t.Fatal(err)
	}
	if _, err := db.ExecContext(ctx, `INSERT INTO match_participants (match_id, player_id, ticket_id, slot, team) VALUES ('assignment-match', 'assignment-player', 'assignment-ticket', 0, 0)`); err != nil {
		t.Fatal(err)
	}
	assignment := DurableAssignment{MatchID: "assignment-match", PlayerID: "assignment-player", AllocationID: "allocation-1", ServerID: "assignment-server", Slot: 0, Region: "EU", ClientBuild: "integration-build", ProtocolVersion: 1, Transport: "enet", Endpoint: "127.0.0.1:7777", JoinAuthorisation: "join-token", ManifestDigest: []byte("manifest"), ExpiresAt: now.Add(time.Minute), Revision: 1}
	if err := SaveAssignment(ctx, db, assignment); err != nil {
		t.Fatalf("save assignment: %v", err)
	}
	got, err := GetAssignment(ctx, db, assignment.PlayerID, assignment.MatchID, now)
	if err != nil {
		t.Fatalf("recover assignment: %v", err)
	}
	if got.JoinAuthorisation != assignment.JoinAuthorisation || got.Slot != assignment.Slot {
		t.Fatalf("assignment changed on round trip: %+v", got)
	}
	if _, err := GetAssignment(ctx, db, "assignment-other", assignment.MatchID, now); err == nil {
		t.Fatal("non-owner recovered assignment")
	}
	if _, err := GetAssignment(ctx, db, assignment.PlayerID, assignment.MatchID, now.Add(2*time.Minute)); err == nil {
		t.Fatal("expired assignment was recovered")
	}
}

func TestPostgreSQLMigrationsAreForwardExecutable(t *testing.T) {
	db := openIntegrationPostgres(t)
	applyIntegrationMigrations(t, db)
	var tableCount int
	if err := db.QueryRow(`SELECT count(*) FROM information_schema.tables WHERE table_schema = 'public' AND table_name = 'assignments'`).Scan(&tableCount); err != nil {
		t.Fatal(err)
	}
	if tableCount != 1 {
		t.Fatal("assignments migration did not create its table")
	}
}