import { readFileSync } from "node:fs";
import { rootPath } from "./config";

export type HwlabRuntimeLane = "v02" | "v03";

export interface HwlabRuntimeNodeSpec {
  readonly id: string;
  readonly route: string;
  readonly kubeRoute: string;
  readonly sourceWorkspace: string;
  readonly gitopsRoot: string;
  readonly networkProfileId: string;
  readonly downloadProfileId: string;
}

export interface HwlabProxySpec {
  readonly http: string;
  readonly https: string;
  readonly all: string;
  readonly socks5?: string;
  readonly noProxy: readonly string[];
}

export interface HwlabNetworkProfileSpec {
  readonly id: string;
  readonly proxy: HwlabProxySpec;
  readonly dockerBuildProxy: HwlabProxySpec;
}

export interface HwlabDownloadProfileSpec {
  readonly id: string;
  readonly git: {
    readonly proxyMode: "inherit" | "direct" | "none";
    readonly retries: number;
  };
  readonly npm: {
    readonly registry: string;
    readonly retries: number;
    readonly fetchTimeoutSeconds: number;
  };
  readonly pip: {
    readonly indexUrl: string;
    readonly retries: number;
    readonly timeoutSeconds: number;
  };
  readonly docker: {
    readonly registryMirrors: readonly string[];
    readonly pullRetries: number;
  };
  readonly curl: {
    readonly retries: number;
    readonly connectTimeoutSeconds: number;
    readonly maxTimeSeconds: number;
  };
}

export interface HwlabRuntimeLaneSpec {
  readonly lane: HwlabRuntimeLane;
  readonly nodeId: string;
  readonly nodeRoute: string;
  readonly nodeKubeRoute: string;
  readonly gitopsRoot: string;
  readonly minor: number;
  readonly version: string;
  readonly sourceBranch: string;
  readonly workspace: string;
  readonly cicdRepo: string;
  readonly cicdRepoLock: string;
  readonly app: string;
  readonly pipeline: string;
  readonly pipelineRunPrefix: string;
  readonly serviceAccountName: string;
  readonly controlPlaneFieldManager: string;
  readonly gitUrl: string;
  readonly gitReadUrl: string;
  readonly gitWriteUrl: string;
  readonly gitopsBranch: string;
  readonly catalogPath: string;
  readonly runtimePath: string;
  readonly runtimeNamespace: string;
  readonly runtimeRenderDir: string;
  readonly tektonDir: string;
  readonly argoApplicationFile: string;
  readonly registryPrefix: string;
  readonly baseImage: string;
  readonly serviceIds: readonly string[];
  readonly publicWebUrl: string;
  readonly publicApiUrl: string;
  readonly networkProfileId: string;
  readonly downloadProfileId: string;
  readonly networkProfile: HwlabNetworkProfileSpec;
  readonly downloadProfile: HwlabDownloadProfileSpec;
}

export const HWLAB_NODE_LANE_CONFIG_PATH = "config/hwlab-node-lanes.yaml";

interface HwlabLaneConfig {
  readonly id: HwlabRuntimeLane;
  readonly node: string;
  readonly minor: number;
  readonly version: string;
  readonly sourceBranch: string;
  readonly workspace: string;
  readonly cicdRepo: string;
  readonly cicdRepoLock: string;
  readonly app: string;
  readonly pipeline: string;
  readonly pipelineRunPrefix: string;
  readonly serviceAccountName: string;
  readonly controlPlaneFieldManager: string;
  readonly git: { readonly url: string; readonly readUrl: string; readonly writeUrl: string };
  readonly gitopsBranch: string;
  readonly catalogPath: string;
  readonly runtime: { readonly path: string; readonly namespace: string; readonly renderDir: string };
  readonly tektonDir: string;
  readonly argoApplicationFile: string;
  readonly registryPrefix: string;
  readonly baseImage: string;
  readonly serviceIds: readonly string[];
  readonly public: { readonly webUrl: string; readonly apiUrl: string };
}

interface HwlabNodeLaneConfig {
  readonly requiredNoProxy: readonly string[];
  readonly nodes: Record<string, HwlabRuntimeNodeSpec>;
  readonly lanes: Record<HwlabRuntimeLane, HwlabLaneConfig>;
  readonly networkProfiles: Record<string, HwlabNetworkProfileSpec>;
  readonly downloadProfiles: Record<string, HwlabDownloadProfileSpec>;
}

function asRecord(value: unknown, path: string): Record<string, unknown> {
  if (typeof value !== "object" || value === null || Array.isArray(value)) throw new Error(`${path} must be an object`);
  return value as Record<string, unknown>;
}

function stringField(obj: Record<string, unknown>, key: string, path: string): string {
  const value = obj[key];
  if (typeof value !== "string" || value.length === 0) throw new Error(`${path}.${key} must be a non-empty string`);
  return value;
}

function numberField(obj: Record<string, unknown>, key: string, path: string): number {
  const value = obj[key];
  if (typeof value !== "number" || !Number.isInteger(value) || value <= 0) throw new Error(`${path}.${key} must be a positive integer`);
  return value;
}

function stringArrayField(obj: Record<string, unknown>, key: string, path: string): string[] {
  const value = obj[key];
  if (!Array.isArray(value) || value.some((item) => typeof item !== "string" || item.length === 0)) {
    throw new Error(`${path}.${key} must be an array of non-empty strings`);
  }
  return [...value] as string[];
}

function optionalStringField(obj: Record<string, unknown>, key: string, path: string): string | undefined {
  const value = obj[key];
  if (value === undefined) return undefined;
  if (typeof value !== "string" || value.length === 0) throw new Error(`${path}.${key} must be a non-empty string`);
  return value;
}

function sortedRecordEntries(value: unknown, path: string): Array<[string, Record<string, unknown>]> {
  return Object.entries(asRecord(value, path)).map(([key, item]) => [key, asRecord(item, `${path}.${key}`)]);
}

function unique(values: readonly string[]): string[] {
  return [...new Set(values)];
}

function proxyConfig(raw: Record<string, unknown>, id: string, key: "proxy" | "dockerBuildProxy", requiredNoProxy: readonly string[]): HwlabProxySpec {
  const proxy = asRecord(raw[key], `networkProfiles.${id}.${key}`);
  return {
    http: stringField(proxy, "http", `networkProfiles.${id}.${key}`),
    https: stringField(proxy, "https", `networkProfiles.${id}.${key}`),
    all: stringField(proxy, "all", `networkProfiles.${id}.${key}`),
    socks5: optionalStringField(proxy, "socks5", `networkProfiles.${id}.${key}`),
    noProxy: unique([...stringArrayField(proxy, "noProxy", `networkProfiles.${id}.${key}`), ...requiredNoProxy]),
  };
}

function networkProfileConfig(id: string, raw: Record<string, unknown>, requiredNoProxy: readonly string[]): HwlabNetworkProfileSpec {
  return {
    id,
    proxy: proxyConfig(raw, id, "proxy", requiredNoProxy),
    dockerBuildProxy: proxyConfig(raw, id, "dockerBuildProxy", requiredNoProxy),
  };
}

function downloadProfileConfig(id: string, raw: Record<string, unknown>): HwlabDownloadProfileSpec {
  const git = asRecord(raw.git, `downloadProfiles.${id}.git`);
  const npm = asRecord(raw.npm, `downloadProfiles.${id}.npm`);
  const pip = asRecord(raw.pip, `downloadProfiles.${id}.pip`);
  const docker = asRecord(raw.docker, `downloadProfiles.${id}.docker`);
  const curl = asRecord(raw.curl, `downloadProfiles.${id}.curl`);
  const proxyMode = stringField(git, "proxyMode", `downloadProfiles.${id}.git`);
  if (proxyMode !== "inherit" && proxyMode !== "direct" && proxyMode !== "none") {
    throw new Error(`downloadProfiles.${id}.git.proxyMode must be inherit, direct, or none`);
  }
  return {
    id,
    git: { proxyMode, retries: numberField(git, "retries", `downloadProfiles.${id}.git`) },
    npm: {
      registry: stringField(npm, "registry", `downloadProfiles.${id}.npm`),
      retries: numberField(npm, "retries", `downloadProfiles.${id}.npm`),
      fetchTimeoutSeconds: numberField(npm, "fetchTimeoutSeconds", `downloadProfiles.${id}.npm`),
    },
    pip: {
      indexUrl: stringField(pip, "indexUrl", `downloadProfiles.${id}.pip`),
      retries: numberField(pip, "retries", `downloadProfiles.${id}.pip`),
      timeoutSeconds: numberField(pip, "timeoutSeconds", `downloadProfiles.${id}.pip`),
    },
    docker: {
      registryMirrors: stringArrayField(docker, "registryMirrors", `downloadProfiles.${id}.docker`),
      pullRetries: numberField(docker, "pullRetries", `downloadProfiles.${id}.docker`),
    },
    curl: {
      retries: numberField(curl, "retries", `downloadProfiles.${id}.curl`),
      connectTimeoutSeconds: numberField(curl, "connectTimeoutSeconds", `downloadProfiles.${id}.curl`),
      maxTimeSeconds: numberField(curl, "maxTimeSeconds", `downloadProfiles.${id}.curl`),
    },
  };
}

function nodeConfig(id: string, raw: Record<string, unknown>): HwlabRuntimeNodeSpec {
  return {
    id,
    route: stringField(raw, "route", `nodes.${id}`),
    kubeRoute: stringField(raw, "kubeRoute", `nodes.${id}`),
    sourceWorkspace: stringField(raw, "sourceWorkspace", `nodes.${id}`),
    gitopsRoot: stringField(raw, "gitopsRoot", `nodes.${id}`),
    networkProfileId: stringField(raw, "networkProfile", `nodes.${id}`),
    downloadProfileId: stringField(raw, "downloadProfile", `nodes.${id}`),
  };
}

function isSupportedLaneId(id: string): id is HwlabRuntimeLane {
  return id === "v02" || id === "v03";
}

function laneConfig(id: HwlabRuntimeLane, raw: Record<string, unknown>): HwlabLaneConfig {
  const git = asRecord(raw.git, `lanes.${id}.git`);
  const runtime = asRecord(raw.runtime, `lanes.${id}.runtime`);
  const publicUrls = asRecord(raw.public, `lanes.${id}.public`);
  const minor = numberField(raw, "minor", `lanes.${id}`);
  const version = stringField(raw, "version", `lanes.${id}`);
  if (version !== `v0.${minor}`) throw new Error(`lanes.${id}.version must equal v0.${minor}`);
  return {
    id,
    node: stringField(raw, "node", `lanes.${id}`),
    minor,
    version,
    sourceBranch: stringField(raw, "sourceBranch", `lanes.${id}`),
    workspace: stringField(raw, "workspace", `lanes.${id}`),
    cicdRepo: stringField(raw, "cicdRepo", `lanes.${id}`),
    cicdRepoLock: stringField(raw, "cicdRepoLock", `lanes.${id}`),
    app: stringField(raw, "app", `lanes.${id}`),
    pipeline: stringField(raw, "pipeline", `lanes.${id}`),
    pipelineRunPrefix: stringField(raw, "pipelineRunPrefix", `lanes.${id}`),
    serviceAccountName: stringField(raw, "serviceAccountName", `lanes.${id}`),
    controlPlaneFieldManager: stringField(raw, "controlPlaneFieldManager", `lanes.${id}`),
    git: {
      url: stringField(git, "url", `lanes.${id}.git`),
      readUrl: stringField(git, "readUrl", `lanes.${id}.git`),
      writeUrl: stringField(git, "writeUrl", `lanes.${id}.git`),
    },
    gitopsBranch: stringField(raw, "gitopsBranch", `lanes.${id}`),
    catalogPath: stringField(raw, "catalogPath", `lanes.${id}`),
    runtime: {
      path: stringField(runtime, "path", `lanes.${id}.runtime`),
      namespace: stringField(runtime, "namespace", `lanes.${id}.runtime`),
      renderDir: stringField(runtime, "renderDir", `lanes.${id}.runtime`),
    },
    tektonDir: stringField(raw, "tektonDir", `lanes.${id}`),
    argoApplicationFile: stringField(raw, "argoApplicationFile", `lanes.${id}`),
    registryPrefix: stringField(raw, "registryPrefix", `lanes.${id}`),
    baseImage: stringField(raw, "baseImage", `lanes.${id}`),
    serviceIds: stringArrayField(raw, "serviceIds", `lanes.${id}`),
    public: {
      webUrl: stringField(publicUrls, "webUrl", `lanes.${id}.public`),
      apiUrl: stringField(publicUrls, "apiUrl", `lanes.${id}.public`),
    },
  };
}

function readHwlabNodeLaneConfig(): HwlabNodeLaneConfig {
  const path = rootPath(HWLAB_NODE_LANE_CONFIG_PATH);
  const raw = readFileSync(path, "utf8");
  const parsed = asRecord(Bun.YAML.parse(raw) as unknown, HWLAB_NODE_LANE_CONFIG_PATH);
  const requiredNoProxy = stringArrayField(parsed, "requiredNoProxy", HWLAB_NODE_LANE_CONFIG_PATH);
  for (const required of ["hyueapi.com", ".hyueapi.com"]) {
    if (!requiredNoProxy.includes(required)) throw new Error(`${HWLAB_NODE_LANE_CONFIG_PATH}.requiredNoProxy must include ${required}`);
  }
  const nodes = Object.fromEntries(sortedRecordEntries(parsed.nodes, "nodes").map(([id, item]) => [id, nodeConfig(id, item)]));
  const networkProfiles = Object.fromEntries(
    sortedRecordEntries(parsed.networkProfiles, "networkProfiles").map(([id, item]) => [id, networkProfileConfig(id, item, requiredNoProxy)]),
  );
  const downloadProfiles = Object.fromEntries(
    sortedRecordEntries(parsed.downloadProfiles, "downloadProfiles").map(([id, item]) => [id, downloadProfileConfig(id, item)]),
  );
  const lanes = Object.fromEntries(sortedRecordEntries(parsed.lanes, "lanes").map(([id, item]) => {
    if (!isSupportedLaneId(id)) throw new Error(`lanes.${id} is not supported by this CLI build`);
    return [id, laneConfig(id, item)];
  })) as Record<HwlabRuntimeLane, HwlabLaneConfig>;
  for (const node of Object.values(nodes)) {
    if (networkProfiles[node.networkProfileId] === undefined) throw new Error(`nodes.${node.id}.networkProfile references missing profile ${node.networkProfileId}`);
    if (downloadProfiles[node.downloadProfileId] === undefined) throw new Error(`nodes.${node.id}.downloadProfile references missing profile ${node.downloadProfileId}`);
  }
  for (const lane of Object.values(lanes)) {
    if (nodes[lane.node] === undefined) throw new Error(`lanes.${lane.id}.node references missing node ${lane.node}`);
  }
  return { requiredNoProxy, nodes, lanes, networkProfiles, downloadProfiles };
}

const HWLAB_NODE_LANE_CONFIG = readHwlabNodeLaneConfig();

function buildRuntimeLaneSpec(config: HwlabLaneConfig): HwlabRuntimeLaneSpec {
  const node = HWLAB_NODE_LANE_CONFIG.nodes[config.node];
  const networkProfile = HWLAB_NODE_LANE_CONFIG.networkProfiles[node.networkProfileId];
  const downloadProfile = HWLAB_NODE_LANE_CONFIG.downloadProfiles[node.downloadProfileId];
  return {
    lane: config.id,
    nodeId: node.id,
    nodeRoute: node.route,
    nodeKubeRoute: node.kubeRoute,
    gitopsRoot: node.gitopsRoot,
    minor: config.minor,
    version: config.version,
    sourceBranch: config.sourceBranch,
    workspace: config.workspace,
    cicdRepo: config.cicdRepo,
    cicdRepoLock: config.cicdRepoLock,
    app: config.app,
    pipeline: config.pipeline,
    pipelineRunPrefix: config.pipelineRunPrefix,
    serviceAccountName: config.serviceAccountName,
    controlPlaneFieldManager: config.controlPlaneFieldManager,
    gitUrl: config.git.url,
    gitReadUrl: config.git.readUrl,
    gitWriteUrl: config.git.writeUrl,
    gitopsBranch: config.gitopsBranch,
    catalogPath: config.catalogPath,
    runtimePath: config.runtime.path,
    runtimeNamespace: config.runtime.namespace,
    runtimeRenderDir: config.runtime.renderDir,
    tektonDir: config.tektonDir,
    argoApplicationFile: config.argoApplicationFile,
    registryPrefix: config.registryPrefix,
    baseImage: config.baseImage,
    serviceIds: config.serviceIds,
    publicWebUrl: config.public.webUrl,
    publicApiUrl: config.public.apiUrl,
    networkProfileId: networkProfile.id,
    downloadProfileId: downloadProfile.id,
    networkProfile,
    downloadProfile,
  };
}

const RUNTIME_LANE_SPECS = Object.fromEntries(
  Object.values(HWLAB_NODE_LANE_CONFIG.lanes).map((config) => [config.id, buildRuntimeLaneSpec(config)]),
) as Record<HwlabRuntimeLane, HwlabRuntimeLaneSpec>;

export function isHwlabRuntimeLane(value: string): value is HwlabRuntimeLane {
  return Object.prototype.hasOwnProperty.call(RUNTIME_LANE_SPECS, value);
}

export function hwlabRuntimeLaneSpec(lane: HwlabRuntimeLane): HwlabRuntimeLaneSpec {
  return RUNTIME_LANE_SPECS[lane];
}

export function hwlabRuntimeLaneIds(): HwlabRuntimeLane[] {
  return Object.keys(RUNTIME_LANE_SPECS) as HwlabRuntimeLane[];
}

export function hwlabRuntimeNodeIds(): string[] {
  return Object.keys(HWLAB_NODE_LANE_CONFIG.nodes);
}

export function hwlabRuntimeLaneConfigPath(): string {
  return HWLAB_NODE_LANE_CONFIG_PATH;
}

export function hwlabRequiredNoProxyEntries(): string[] {
  return [...HWLAB_NODE_LANE_CONFIG.requiredNoProxy];
}