import { sql, type SQL } from "drizzle-orm";
import { issues } from "@paperclipai/db";
import { PROVIDER_QUOTA_MONITOR_SERVICE_NAME, type IssueDisplayStatus } from "@paperclipai/shared";

/** Read-only projection, shared by task reads, search, filters and counts.
 * The persisted deadline is the scheduler's source of truth. Locks and recovery
 * take precedence; a retained monitor alone must not disguise active work.
 */
export function issueDisplayStatusSql(): SQL<IssueDisplayStatus> {
  // Drizzle removes column qualifiers in a single-table SELECT. Keep these
  // outer references explicitly qualified so correlated reads cannot bind to
  // the run/recovery table's own id or company_id instead.
  const issueId = sql`"issues"."id"`;
  const companyId = sql`"issues"."company_id"`;
  return sql<IssueDisplayStatus>`CASE WHEN
    ${issues.status} = 'in_progress'
    AND ${issues.assigneeAgentId} IS NOT NULL AND ${issues.assigneeUserId} IS NULL
    AND ${issues.monitorNextCheckAt} IS NOT NULL
    AND ${issues.executionRunId} IS NULL AND ${issues.checkoutRunId} IS NULL
    AND ${issues.executionState}->>'currentParticipant' IS NULL
    AND COALESCE(${issues.executionState}#>>'{monitor,status}', 'scheduled') = 'scheduled'
    AND ${issues.executionPolicy}->'monitor' IS NOT NULL
    AND COALESCE(${issues.executionPolicy}#>>'{monitor,serviceName}', '') <> ${PROVIDER_QUOTA_MONITOR_SERVICE_NAME}
    AND NOT EXISTS (
      SELECT 1 FROM heartbeat_runs display_run
      WHERE display_run.company_id = ${companyId}
        AND display_run.issue_id = ${issueId}
        AND display_run.status IN ('queued', 'running')
    )
    AND NOT EXISTS (
      SELECT 1 FROM issue_recovery_actions display_recovery
      WHERE display_recovery.company_id = ${companyId}
        AND display_recovery.source_issue_id = ${issueId}
        AND display_recovery.status IN ('active', 'escalated')
    )
    THEN 'monitoring' ELSE ${issues.status} END`;
}