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

export type ViewScopeType = "system" | "tenant";
export type ViewAssignmentScopeType = "system" | "tenant" | "group" | "user";
export type ViewAssignmentMode = "available" | "default" | "required";

export type ViewRevision = {
  id: string;
  definition_id: string;
  revision: number;
  surface_contract_version: string;
  visible_surface_ids: string[];
  content_hash: string;
  created_by?: string | null;
  created_at: string;
};

export type ViewDefinition = {
  id: string;
  tenant_id?: string | null;
  scope_type: ViewScopeType;
  scope_id?: string | null;
  definition_key: string;
  name: string;
  description?: string | null;
  status: "draft" | "published" | "archived";
  current_revision: number;
  latest_revision: ViewRevision;
  published_revision?: ViewRevision | null;
  readonly: boolean;
  stale_surface_ids: string[];
  created_by?: string | null;
  updated_by?: string | null;
  created_at: string;
  updated_at: string;
};

export type ViewAssignment = {
  id: string;
  tenant_id?: string | null;
  scope_type: ViewAssignmentScopeType;
  scope_id?: string | null;
  definition_id: string;
  revision_id?: string | null;
  mode: ViewAssignmentMode;
  priority: number;
  is_active: boolean;
  metadata: Record<string, unknown>;
  created_by?: string | null;
  updated_by?: string | null;
  created_at: string;
  updated_at: string;
};

type EffectiveViewApiResponse = {
  active_view_id?: string | null;
  active_revision_id?: string | null;
  active_view_name?: string | null;
  visible_surface_ids: string[];
  locked: boolean;
  available_views: Array<{
    id: string;
    name: string;
    description?: string | null;
    revision_id: string;
  }>;
  provenance: Array<{
    source: string;
    scope_type?: string | null;
    scope_id?: string | null;
    detail?: string | null;
  }>;
  diagnostics?: Array<{
    severity: "warning" | "error";
    code: string;
    message: string;
    surface_ids: string[];
  }>;
};

function jsonBody(payload: unknown): RequestInit {
  return {
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify(payload)
  };
}

function projection(response: EffectiveViewApiResponse): EffectiveViewProjection {
  return {
    activeViewId: response.active_view_id ?? null,
    activeRevisionId: response.active_revision_id ?? null,
    activeViewName: response.active_view_name ?? null,
    visibleSurfaceIds: response.visible_surface_ids,
    locked: response.locked,
    availableViews: response.available_views.map((view) => ({
      id: view.id,
      name: view.name,
      description: view.description,
      revisionId: view.revision_id
    })),
    provenance: response.provenance.map((item) => ({
      source: item.source,
      scopeType: item.scope_type,
      scopeId: item.scope_id,
      detail: item.detail
    })),
    diagnostics: (response.diagnostics ?? []).map((item) => ({
      severity: item.severity,
      code: item.code,
      message: item.message,
      surfaceIds: item.surface_ids
    }))
  };
}

export async function fetchEffectiveView(
  settings: ApiSettings
): Promise<EffectiveViewProjection> {
  return projection(
    await apiFetch<EffectiveViewApiResponse>(
      settings,
      "/api/v1/views/effective",
      { cache: "no-store" }
    )
  );
}

export async function selectEffectiveView(
  settings: ApiSettings,
  viewId: string | null
): Promise<EffectiveViewProjection> {
  return projection(
    await apiFetch<EffectiveViewApiResponse>(
      settings,
      "/api/v1/views/selection",
      {
        method: "PUT",
        ...jsonBody({ view_id: viewId })
      }
    )
  );
}

export async function fetchViewDefinitions(
  settings: ApiSettings,
  scopeType: ViewScopeType
): Promise<ViewDefinition[]> {
  const response = await apiFetch<{ definitions: ViewDefinition[] }>(
    settings,
    apiPath("/api/v1/views/definitions", {
      scope_type: scopeType,
      include_inherited: scopeType === "tenant"
    })
  );
  return response.definitions;
}

export function createViewDefinition(
  settings: ApiSettings,
  payload: {
    scope_type: ViewScopeType;
    name: string;
    description?: string | null;
    visible_surface_ids: string[];
  }
): Promise<ViewDefinition> {
  return apiFetch(settings, "/api/v1/views/definitions", {
    method: "POST",
    ...jsonBody(payload)
  });
}

export function updateViewDefinition(
  settings: ApiSettings,
  definitionId: string,
  payload: { name: string; description?: string | null }
): Promise<ViewDefinition> {
  return apiFetch(settings, `/api/v1/views/definitions/${definitionId}`, {
    method: "PATCH",
    ...jsonBody(payload)
  });
}

export function createViewRevision(
  settings: ApiSettings,
  definitionId: string,
  visibleSurfaceIds: string[]
): Promise<ViewDefinition> {
  return apiFetch(
    settings,
    `/api/v1/views/definitions/${definitionId}/revisions`,
    {
      method: "POST",
      ...jsonBody({ visible_surface_ids: visibleSurfaceIds })
    }
  );
}

export function publishViewRevision(
  settings: ApiSettings,
  definitionId: string,
  revisionId: string
): Promise<ViewDefinition> {
  return apiFetch(
    settings,
    `/api/v1/views/definitions/${definitionId}/revisions/${revisionId}/publish`,
    { method: "POST" }
  );
}

export function archiveViewDefinition(
  settings: ApiSettings,
  definitionId: string
): Promise<ViewDefinition> {
  return apiFetch(settings, `/api/v1/views/definitions/${definitionId}`, {
    method: "DELETE"
  });
}

export async function fetchViewAssignments(
  settings: ApiSettings,
  scopeType: ViewScopeType
): Promise<ViewAssignment[]> {
  const response = await apiFetch<{ assignments: ViewAssignment[] }>(
    settings,
    apiPath("/api/v1/views/assignments", {
      scope_type: scopeType,
      include_inherited: scopeType === "tenant"
    })
  );
  return response.assignments;
}

export function createViewAssignment(
  settings: ApiSettings,
  payload: {
    scope_type: ViewAssignmentScopeType;
    scope_id?: string | null;
    definition_id: string;
    revision_id?: string | null;
    mode: ViewAssignmentMode;
    priority: number;
    is_active: boolean;
  }
): Promise<ViewAssignment> {
  return apiFetch(settings, "/api/v1/views/assignments", {
    method: "POST",
    ...jsonBody(payload)
  });
}

export function updateViewAssignment(
  settings: ApiSettings,
  assignmentId: string,
  payload: {
    revision_id?: string | null;
    mode?: ViewAssignmentMode;
    priority?: number;
    is_active?: boolean;
  }
): Promise<ViewAssignment> {
  return apiFetch(settings, `/api/v1/views/assignments/${assignmentId}`, {
    method: "PATCH",
    ...jsonBody(payload)
  });
}

export function deleteViewAssignment(
  settings: ApiSettings,
  assignmentId: string
): Promise<void> {
  return apiFetch(settings, `/api/v1/views/assignments/${assignmentId}`, {
    method: "DELETE"
  });
}