import { api } from './api';
import type { Priority } from './derive';
import type { Requirement, RequirementStatus, SourceType } from './requirement';

export interface RootProject {
  id: string;
  name: string;
  description: string;
  createdAt: string;
}

export interface RootVersion {
  id: string;
  productId?: string;
  projectId?: string | null;
  name: string;
  status?: string;
  releaseDate: string | null;
  createdAt: string;
  currentStage?: string | null;
  startDate?: string | null;
  expectedReleaseDate?: string | null;
  members?: unknown[];
  progress?: unknown[];
  priority?: string;
  links?: unknown;
}

export interface RootProduct {
  id: string;
  name: string;
  description: string;
  createdAt: string;
  updatedAt: string;
  projects: RootProject[];
  versions: RootVersion[];
  _count?: { requirements: number; projects: number; versions?: number };
}

export async function createProductRoot(data: { name: string; description?: string }): Promise<RootProduct> {
  const product = await api.post<Omit<RootProduct, 'projects' | 'versions'>>('/products', data);
  return normalizeProductRoot({ ...product, projects: [], versions: [] });
}

export async function updateProductRoot(
  productId: string,
  data: { name?: string; description?: string },
): Promise<Partial<RootProduct>> {
  return api.patch<Partial<RootProduct>>(`/products/${productId}`, data);
}

export async function deleteProductRoot(productId: string): Promise<void> {
  await api.delete(`/products/${productId}`);
}

export async function createProjectByProductId(
  productId: string,
  data: { name: string; description?: string },
): Promise<RootProject> {
  return api.post<RootProject>(`/products/${productId}/projects`, data);
}

export async function updateProjectByProductId(
  productId: string,
  projectId: string,
  data: { name?: string; description?: string },
): Promise<RootProject> {
  return api.patch<RootProject>(`/products/${productId}/projects/${projectId}`, data);
}

export async function deleteProjectByProductId(productId: string, projectId: string): Promise<void> {
  await api.delete(`/products/${productId}/projects/${projectId}`);
}

export async function createVersionByProductId(
  productId: string,
  data: { name: string; status?: string; projectId?: string },
): Promise<RootVersion> {
  return normalizeVersionRoot(await api.post<RootVersion>(`/products/${productId}/versions`, data));
}

export async function updateVersionByProductId(
  productId: string,
  versionId: string,
  data: Record<string, unknown>,
): Promise<RootVersion> {
  return normalizeVersionRoot(await api.patch<RootVersion>(`/products/${productId}/versions/${versionId}`, data));
}

export async function deleteVersionByProductId(productId: string, versionId: string): Promise<void> {
  await api.delete(`/products/${productId}/versions/${versionId}`);
}

interface DomainRequirementRow {
  id: string;
  productId: string;
  projectId?: string | null;
  versionId?: string | null;
  code: string;
  title: string;
  description?: string | null;
  status?: string | null;
  priority?: string | number | null;
  type?: string | null;
  sourceType?: string | null;
  sourceTarget?: string | null;
  platform?: string | null;
  creatorId?: string | null;
  creatorName?: string | null;
  creator?: { id?: string | null; name?: string | null } | null;
  createdAt?: string | Date | null;
}

export async function createRequirementByProductId(
  productId: string,
  data: Partial<Requirement>,
): Promise<Requirement> {
  return normalizeRequirement(await api.post<DomainRequirementRow>(
    `/products/${productId}/requirements`,
    toRequirementPayload(data),
  ));
}

export async function updateRequirementByProductId(
  productId: string,
  requirementId: string,
  data: Partial<Requirement>,
): Promise<Requirement> {
  return normalizeRequirement(await api.patch<DomainRequirementRow>(
    `/products/${productId}/requirements/${requirementId}`,
    toRequirementPayload(data),
  ));
}

export async function updateRequirementStatusByProductId(
  productId: string,
  requirementId: string,
  status: RequirementStatus,
): Promise<Requirement> {
  return normalizeRequirement(await api.patch<DomainRequirementRow>(
    `/products/${productId}/requirements/${requirementId}/status`,
    { status },
  ));
}

export async function deleteRequirementByProductId(productId: string, requirementId: string): Promise<void> {
  await api.delete(`/products/${productId}/requirements/${requirementId}`);
}

function normalizeProductRoot(product: RootProduct): RootProduct {
  return {
    ...product,
    projects: product.projects ?? [],
    versions: (product.versions ?? []).map(normalizeVersionRoot),
    _count: product._count ?? { requirements: 0, projects: product.projects?.length ?? 0, versions: product.versions?.length ?? 0 },
  };
}

function normalizeVersionRoot(version: RootVersion): RootVersion {
  return {
    ...version,
    status: version.status ?? 'planned',
    releaseDate: version.releaseDate ?? null,
    members: Array.isArray(version.members) ? version.members : [],
    progress: Array.isArray(version.progress) ? version.progress : [],
    links: version.links && typeof version.links === 'object' ? version.links : {},
  };
}

function toRequirementPayload(data: Partial<Requirement>) {
  return {
    ...(data.code !== undefined && { code: data.code }),
    ...(data.title !== undefined && { title: data.title }),
    ...(data.description !== undefined && { description: data.description }),
    ...(data.projectId !== undefined && { projectId: data.projectId }),
    ...(data.versionId !== undefined && { versionId: data.versionId ?? null }),
    ...(data.typeId !== undefined && { type: data.typeId }),
    ...(data.sourceType !== undefined && { sourceType: data.sourceType }),
    ...(data.sourceTarget !== undefined && { sourceTarget: data.sourceTarget }),
    ...(data.platforms !== undefined && { platform: data.platforms.join(',') }),
    ...(data.priority !== undefined && { priority: priorityToNumber(data.priority) }),
  };
}

function normalizeRequirement(row: DomainRequirementRow): Requirement {
  return {
    id: row.id,
    code: row.code,
    title: row.title,
    description: row.description ?? '',
    productId: row.productId,
    projectId: row.projectId ?? '',
    versionId: row.versionId ?? undefined,
    sourceType: toSourceType(row.sourceType),
    sourceTarget: row.sourceTarget ?? '',
    platforms: splitCsv(row.platform),
    typeId: row.type ?? '',
    status: toRequirementStatus(row.status),
    priority: toPriority(row.priority),
    effort: 'M',
    creator: row.creator?.name ?? row.creatorName ?? row.creatorId ?? '',
    createdAt: isoString(row.createdAt),
  };
}

function toSourceType(value: string | null | undefined): SourceType {
  const allowed = new Set<SourceType>(['customer', 'internal', 'operation', 'aftersale', 'market', 'competitor', 'management']);
  return allowed.has(value as SourceType) ? value as SourceType : 'internal';
}

function toRequirementStatus(value: string | null | undefined): RequirementStatus {
  const allowed = new Set<RequirementStatus>(['pending_review', 'adopted', 'rejected', 'planned', 'developing', 'testing', 'released', 'closed']);
  return allowed.has(value as RequirementStatus) ? value as RequirementStatus : 'pending_review';
}

function toPriority(value: string | number | null | undefined): Priority {
  if (typeof value === 'string' && /^P[0-4]$/.test(value)) return value as Priority;
  const parsed = Number(value ?? 2);
  const normalized = Number.isFinite(parsed) ? Math.max(0, Math.min(4, Math.floor(parsed))) : 2;
  return `P${normalized}` as Priority;
}

function priorityToNumber(value: Priority | undefined): number | undefined {
  if (!value) return undefined;
  const match = /^P([0-4])$/.exec(value);
  return match ? Number(match[1]) : undefined;
}

function splitCsv(value: string | null | undefined): string[] {
  if (!value) return [];
  return value.split(',').map((item) => item.trim()).filter(Boolean);
}

function isoString(value: string | Date | null | undefined): string {
  if (!value) return new Date().toISOString();
  if (value instanceof Date) return value.toISOString();
  const time = new Date(value).getTime();
  return Number.isFinite(time) ? new Date(time).toISOString() : new Date().toISOString();
}