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


export type FormValueType = "text" | "multiline_text" | "integer" | "number" | "boolean" | "date" | "datetime" | "email" | "choice" | "multi_choice" | "object" | "list";

export type FormCondition =
  | { kind: "predicate"; field_key: string; operator: "eq" | "neq" | "lt" | "lte" | "gt" | "gte" | "in" | "not_in" | "contains" | "is_empty" | "is_not_empty"; value?: unknown }
  | { kind: "all" | "any"; conditions: FormCondition[] }
  | { kind: "not"; conditions: [FormCondition] };

export type FormFieldDefinition = {
  key: string;
  label: string;
  value_type: FormValueType;
  required: boolean;
  help_text?: string | null;
  options: string[];
  constraints: Record<string, unknown>;
  default_value?: unknown;
  visibility_condition?: FormCondition | null;
  accessibility?: Record<string, unknown>;
};

export type FormSectionDefinition = {
  key: string;
  title: string;
  description?: string | null;
  field_keys: string[];
  visibility_condition?: FormCondition | null;
};

export type FormPageDefinition = {
  key: string;
  title: string;
  description?: string | null;
  sections: FormSectionDefinition[];
  visibility_condition?: FormCondition | null;
};

export type FormLocalization = {
  locale: string;
  title?: string | null;
  description?: string | null;
  field_labels: Record<string, string>;
  field_help_texts: Record<string, string>;
  option_labels: Record<string, Record<string, string>>;
  page_titles: Record<string, string>;
  section_titles: Record<string, string>;
};

export type FormDefinition = {
  reference: {
    kind: "form";
    owner_module: "forms";
    object_id: string;
    tenant_id: string;
    version: string;
  };
  key: string;
  temporal: {
    revision: string;
    valid_from?: string | null;
    valid_to?: string | null;
    recorded_at: string;
    superseded_at?: string | null;
    change_reason: string;
  };
  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[];
  pages?: FormPageDefinition[];
  fallback_locale?: string | null;
  localizations?: FormLocalization[];
  accessibility?: Record<string, unknown>;
  metadata: Record<string, unknown>;
};

export type FormPackageFragment = {
  kind: "govoplan.forms.definition";
  contract_version: "0.1.0";
  definition: FormDefinition;
  definition_sha256: string;
  provenance: Record<string, unknown>;
};

export function listFormDefinitions(
  settings: ApiSettings,
  options: { query?: string; states?: string[]; offset?: number; limit?: number } = {},
  signal?: AbortSignal
): Promise<{ definitions: FormDefinition[]; total: number }> {
  return apiFetch(settings, apiPath("/api/v1/forms/definitions", {
    q: options.query,
    publication_state: options.states,
    offset: options.offset ?? 0,
    limit: options.limit ?? 200
  }), { signal });
}

export function saveFormDefinition(
  settings: ApiSettings,
  definition: FormDefinition,
  expectedRevision?: string | null
): Promise<FormDefinition> {
  return apiFetch(settings, `/api/v1/forms/definitions/${encodeURIComponent(definition.reference.object_id)}`, {
    method: "PUT",
    body: JSON.stringify({
      definition,
      expected_revision: expectedRevision ?? null
    })
  });
}

export function exportFormDefinitionPackage(
  settings: ApiSettings,
  formId: string,
  revision: string
): Promise<FormPackageFragment> {
  return apiFetch(settings, apiPath(`/api/v1/forms/definitions/${encodeURIComponent(formId)}/package`, { revision }));
}

export function assessFormDefinitionPackage(
  settings: ApiSettings,
  fragment: FormPackageFragment
): Promise<{ outcome: string; requires_remap: boolean; current_revision?: string | null }> {
  return apiFetch(settings, "/api/v1/forms/packages/assess", {
    method: "POST",
    body: JSON.stringify({ fragment })
  });
}

export function importFormDefinitionPackage(
  settings: ApiSettings,
  fragment: FormPackageFragment,
  options: { targetFormId?: string; targetKey?: string; expectedRevision?: string; changeReason: string }
): Promise<FormDefinition> {
  return apiFetch(settings, "/api/v1/forms/packages/import", {
    method: "POST",
    body: JSON.stringify({
      fragment,
      target_form_id: options.targetFormId || null,
      target_key: options.targetKey || null,
      expected_revision: options.expectedRevision || null,
      change_reason: options.changeReason,
      recorded_at: new Date().toISOString()
    })
  });
}