import { apiFetch, apiPath, type ApiSettings } from "@govoplan/core-webui";


export type InstitutionalReference = {
  kind: string;
  owner_module: string;
  object_id: string;
  tenant_id: string;
  version?: string | null;
  valid_at?: string | null;
  label?: string | null;
};

export type EvidenceReference = {
  kind: string;
  owner_module: string;
  evidence_id: string;
  tenant_id: string;
  version?: string | null;
};

export type FormFieldDefinition = {
  key: string;
  label: string;
  value_type: "text" | "multiline_text" | "integer" | "number" | "boolean" | "date" | "datetime" | "email" | "choice" | "multi_choice" | "object" | "list";
  required: boolean;
  help_text?: string | null;
  options: string[];
  constraints: Record<string, unknown>;
  default_value?: unknown;
};

export type FormDefinition = {
  reference: InstitutionalReference;
  key: string;
  temporal: { revision: string; recorded_at?: string | null };
  title: string;
  description?: string | null;
  fields: FormFieldDefinition[];
  publication_state: "draft" | "published" | "retired";
  allow_drafts: boolean;
  max_attachments: number;
  signature_requirement: "none" | "optional" | "required";
  policy_refs: string[];
  handoff_kinds: string[];
};

export type ValidationResult = {
  field?: string | null;
  severity: "warning" | "error";
  code: string;
  message: string;
};

export type FormInstance = {
  reference: InstitutionalReference;
  tenant_id: string;
  instance_id: string;
  revision: number;
  status: string;
  definition_ref: InstitutionalReference;
  values: Record<string, unknown>;
  validation_results: ValidationResult[];
  attachment_refs: EvidenceReference[];
  signature_refs: EvidenceReference[];
  handoff_refs: InstitutionalReference[];
  service_ref?: InstitutionalReference | null;
  receipt_id?: string | null;
  recorded_at: string;
  change_reason: string;
  created_by: string;
  changed_by: string;
  replayed: boolean;
};

export type FormInstanceEvent = {
  event_id: string;
  event_type: string;
  instance_revision: number;
  status: string;
  occurred_at: string;
  actor_id: string;
  payload: Record<string, unknown>;
};

export function listFormInstances(
  settings: ApiSettings,
  options: { statuses?: string[]; definitionId?: string; offset?: number; limit?: number } = {},
  signal?: AbortSignal
): Promise<{ instances: FormInstance[]; total: number; offset: number; limit: number }> {
  return apiFetch(settings, apiPath("/api/v1/forms-runtime/instances", {
    status: options.statuses,
    definition_id: options.definitionId,
    offset: options.offset ?? 0,
    limit: options.limit ?? 100
  }), { signal });
}

export function getFormInstance(
  settings: ApiSettings,
  instanceId: string,
  signal?: AbortSignal
): Promise<FormInstance> {
  return apiFetch(settings, `/api/v1/forms-runtime/instances/${encodeURIComponent(instanceId)}`, { signal });
}

export function getFormDefinition(
  settings: ApiSettings,
  instanceId: string,
  signal?: AbortSignal
): Promise<FormDefinition> {
  return apiFetch(
    settings,
    `/api/v1/forms-runtime/instances/${encodeURIComponent(instanceId)}/definition`,
    { signal }
  );
}

export function getFormInstanceHistory(
  settings: ApiSettings,
  instanceId: string,
  signal?: AbortSignal
): Promise<{ revisions: FormInstance[] }> {
  return apiFetch(settings, `/api/v1/forms-runtime/instances/${encodeURIComponent(instanceId)}/history`, { signal });
}

export function getFormInstanceEvents(
  settings: ApiSettings,
  instanceId: string,
  signal?: AbortSignal
): Promise<{ events: FormInstanceEvent[] }> {
  return apiFetch(settings, `/api/v1/forms-runtime/instances/${encodeURIComponent(instanceId)}/events`, { signal });
}

export function saveFormDraft(
  settings: ApiSettings,
  instance: FormInstance,
  values: Record<string, unknown>,
  changeReason: string
): Promise<FormInstance> {
  return apiFetch(settings, `/api/v1/forms-runtime/instances/${encodeURIComponent(instance.instance_id)}`, {
    method: "PATCH",
    body: JSON.stringify({
      expected_revision: instance.revision,
      values,
      attachment_refs: instance.attachment_refs,
      signature_refs: instance.signature_refs,
      idempotency_key: crypto.randomUUID(),
      recorded_at: new Date().toISOString(),
      change_reason: changeReason
    })
  });
}

export function submitFormInstance(
  settings: ApiSettings,
  instance: FormInstance,
  values: Record<string, unknown>
): Promise<FormInstance> {
  return apiFetch(settings, `/api/v1/forms-runtime/instances/${encodeURIComponent(instance.instance_id)}/submit`, {
    method: "POST",
    body: JSON.stringify({
      expected_revision: instance.revision,
      values,
      attachment_refs: instance.attachment_refs,
      signature_refs: instance.signature_refs,
      idempotency_key: crypto.randomUUID(),
      recorded_at: new Date().toISOString()
    })
  });
}