//go:build mysql

package mysql

import (
	"database/sql"
	"strings"
	"testing"

	types "github.com/tinode/chat/server/store/types"
)

type recordingGroupSchemaExecutor struct {
	statements []string
}

func (e *recordingGroupSchemaExecutor) Exec(query string, _ ...any) (sql.Result, error) {
	e.statements = append(e.statements, query)
	return nil, nil
}

func TestEnsureIMGroupBusinessTablesUsesSelectedTenantDatabase(t *testing.T) {
	exec := &recordingGroupSchemaExecutor{}
	if err := ensureIMGroupBusinessTables(exec); err != nil {
		t.Fatal(err)
	}
	if len(exec.statements) != 22 {
		t.Fatalf("executed %d group schema statements, want 22", len(exec.statements))
	}
	for _, statement := range exec.statements {
		if strings.Contains(strings.ToLower(statement), "tinode.") || strings.Contains(strings.ToLower(statement), "create database") {
			t.Fatalf("group schema must use the selected tenant database: %s", statement)
		}
	}
	joined := strings.ToLower(strings.Join(exec.statements, "\n"))
	if strings.Contains(joined, "im_group_events_outbox") {
		t.Fatal("group event outbox table must not be created")
	}
	if strings.Contains(joined, "im_group_idempotency") {
		t.Fatal("group idempotency table must not be created")
	}
	for _, expected := range []string{
		"primary key(id), unique index uk_im_group_settings_topic(tenant_id, topic)",
		"primary key(id), unique index uk_im_group_announcement_reads_announcement_user(tenant_id, announcement_id, user_id)",
		"primary key(id), unique index uk_im_group_mutes_topic_user(tenant_id, topic, user_id)",
	} {
		if !strings.Contains(joined, expected) {
			t.Fatalf("group schema is missing snowflake primary-key definition %q", expected)
		}
	}
	if !strings.Contains(joined, "json_set(public, '$.fn'") {
		t.Fatal("group schema is missing historical public.fn backfill")
	}
	for _, expected := range []string{"im_group_message_shards", "primary key(message_id)"} {
		if !strings.Contains(joined, expected) {
			t.Fatalf("group shard schema is missing %q", expected)
		}
	}
	if strings.Contains(joined, "im_group_message_topic_shards") {
		t.Fatal("group message topic shard routes must not be created in MySQL")
	}
	if strings.Contains(joined, "im_group_message_dedup") {
		t.Fatal("group message dedup table must not be created")
	}
}

func TestGroupMessageShardTableRejectsUnsafeMonth(t *testing.T) {
	if table, ok := groupMessageShardTable(1, "202609"); !ok || table != "im_001_group_messages_202609" {
		t.Fatalf("unexpected valid shard: table=%q ok=%v", table, ok)
	}
	for _, month := range []string{"", "20269", "202613", "2026_09", "202609;DROP TABLE im_users"} {
		if table, ok := groupMessageShardTable(1, month); ok || table != "" {
			t.Fatalf("unsafe shard month accepted: month=%q table=%q", month, table)
		}
	}
}

func TestTenantPartitionTableNames(t *testing.T) {
	tests := []struct {
		tenantID types.TenantID
		friends  string
		messages string
		topics   string
		members  string
		subs     string
		notices  string
		group    string
	}{
		{tenantID: 1, friends: "im_001_friendships", messages: "im_001_messages", topics: "im_001_topics", members: "im_001_group_members", subs: "im_001_subscriptions", notices: "im_001_system_notifications", group: "im_001_group_messages_202609"},
		{tenantID: 10, friends: "im_010_friendships", messages: "im_010_messages", topics: "im_010_topics", members: "im_010_group_members", subs: "im_010_subscriptions", notices: "im_010_system_notifications", group: "im_010_group_messages_202609"},
		{tenantID: 1000, friends: "im_1000_friendships", messages: "im_1000_messages", topics: "im_1000_topics", members: "im_1000_group_members", subs: "im_1000_subscriptions", notices: "im_1000_system_notifications", group: "im_1000_group_messages_202609"},
	}
	for _, tc := range tests {
		if got := tenantFriendshipsTable(tc.tenantID); got != tc.friends {
			t.Fatalf("tenant %d friendship table: got %q, want %q", tc.tenantID, got, tc.friends)
		}
		if got := tenantMessagesTable(tc.tenantID); got != tc.messages {
			t.Fatalf("tenant %d message table: got %q, want %q", tc.tenantID, got, tc.messages)
		}
		if got := tenantTopicsTable(tc.tenantID); got != tc.topics {
			t.Fatalf("tenant %d topics table: got %q, want %q", tc.tenantID, got, tc.topics)
		}
		if got := tenantGroupMembersTable(tc.tenantID); got != tc.members {
			t.Fatalf("tenant %d group members table: got %q, want %q", tc.tenantID, got, tc.members)
		}
		if got := tenantSubscriptionsTable(tc.tenantID); got != tc.subs {
			t.Fatalf("tenant %d subscriptions table: got %q, want %q", tc.tenantID, got, tc.subs)
		}
		if got := tenantSystemNotificationsTable(tc.tenantID); got != tc.notices {
			t.Fatalf("tenant %d system notifications table: got %q, want %q", tc.tenantID, got, tc.notices)
		}
		if got, ok := tenantGroupMessagesTable(tc.tenantID, "202609"); !ok || got != tc.group {
			t.Fatalf("tenant %d group message table: got %q, ok=%v, want %q", tc.tenantID, got, ok, tc.group)
		}
	}
}

func TestTenantShardSQL(t *testing.T) {
	query := tenantShardSQL(7, "SELECT * FROM im_topics t JOIN im_group_members AS gm FORCE INDEX (`idx_im_group_members_topic_role`) ON gm.topic=t.name JOIN im_subscriptions s ON s.topic=gm.topic; INSERT INTO im_system_notifications(event_id) VALUES(?)")
	for _, expected := range []string{"im_007_topics", "im_007_group_members", "im_007_subscriptions", "im_007_system_notifications"} {
		if !strings.Contains(query, expected) {
			t.Fatalf("tenant shard query is missing %q: %s", expected, query)
		}
	}
	for _, shared := range []string{" im_topics ", " im_group_members ", " im_subscriptions ", " im_system_notifications"} {
		if strings.Contains(query, shared) {
			t.Fatalf("tenant shard query should not reference shared table %q: %s", shared, query)
		}
	}
	if !strings.Contains(query, "idx_im_group_members_topic_role") {
		t.Fatalf("tenant shard query should not rewrite index names: %s", query)
	}
	if strings.Contains(query, "idx_im_007_group_members_topic_role") {
		t.Fatalf("tenant shard query rewrote index name: %s", query)
	}
}