import { mkdirSync } from 'node:fs';
import { homedir } from 'node:os';

import { join } from 'pathe';

import type { KimiHostIdentity } from '@moonshot-ai/kimi-code-oauth';

import { SyncDescriptor } from '#/_base/di/descriptors';
import { createDecorator, type ServiceIdentifier } from '#/_base/di/instantiation';
import { createAppScope, type Scope, type ScopeSeed } from '#/_base/di/scope';
import {
  IFileSystemStorageService,
} from '#/persistence/interface/storage';
import { FileStorageService } from '#/persistence/backends/node-fs/fileStorageService';
import { FileSkillDiscovery } from '#/features/skill/catalog/fileSkillDiscovery';
import { ISkillDiscovery } from '#/features/skill/catalog/skillDiscovery';

export type HostUiCapability = 'update_panel';

export interface HostArgs {
  readonly agentFiles?: readonly string[];
  readonly skillDirs?: readonly string[];
  readonly requestHeaders: Readonly<Record<string, string>>;
  readonly displayName?: string;
  readonly replyStyleGuide?: string;
  readonly nonInteractive?: boolean;
  readonly uiCapabilities?: readonly HostUiCapability[];
}

export interface HostArgsInput {
  readonly agentFiles?: readonly string[];
  readonly skillDirs?: readonly string[];
  readonly requestHeaders?: Readonly<Record<string, string>>;
  readonly displayName?: string;
  readonly replyStyleGuide?: string;
  readonly nonInteractive?: boolean;
  readonly uiCapabilities?: readonly HostUiCapability[];
}

export function resolveHostArgs(input: HostArgsInput | undefined): HostArgs {
  return {
    agentFiles: input?.agentFiles,
    skillDirs: input?.skillDirs,
    requestHeaders: input?.requestHeaders ?? {},
    displayName: input?.displayName,
    replyStyleGuide: input?.replyStyleGuide,
    nonInteractive: input?.nonInteractive,
    uiCapabilities: input?.uiCapabilities,
  };
}

export interface IBootstrapOptions {
  readonly homeDir: string;
  readonly configPath: string;
  readonly osHomeDir: string;
  readonly platform: NodeJS.Platform;
  readonly arch: string;
  readonly cwd: string;
  readonly env: NodeJS.ProcessEnv;
  readonly clientIdentity: KimiHostIdentity;
  readonly args: HostArgs;
}

export const IBootstrapOptions: ServiceIdentifier<IBootstrapOptions> =
  createDecorator<IBootstrapOptions>('bootstrapOptions');

export type PersistenceScopeName =
  | 'config'
  | 'sessions'
  | 'blobs'
  | 'store'
  | 'logs'
  | 'cache'
  | 'credentials';

export interface IBootstrapService {
  readonly _serviceBrand: undefined;

  readonly platform: NodeJS.Platform;
  readonly arch: string;
  readonly cwd: string;
  readonly osHomeDir: string;
  readonly homeDir: string;
  readonly configPath: string;
  readonly clientIdentity: KimiHostIdentity;
  readonly args: HostArgs;
  readonly sessionsDir: string;
  readonly blobsDir: string;
  readonly storeDir: string;
  readonly cacheDir: string;
  readonly logsDir: string;
  getEnv(name: string): string | undefined;
  scope(name: PersistenceScopeName): string;
  readonly configKey: string;
}

export const IBootstrapService: ServiceIdentifier<IBootstrapService> =
  createDecorator<IBootstrapService>('bootstrapService');

export interface BootstrapInput {
  readonly homeDir?: string;
  readonly configPath?: string;
  readonly env?: NodeJS.ProcessEnv;
  readonly osHomeDir?: string;
  readonly platform?: NodeJS.Platform;
  readonly arch?: string;
  readonly cwd?: string;
  readonly clientIdentity: KimiHostIdentity;
  readonly args?: HostArgsInput;
}

export function resolveBootstrapOptions(input: BootstrapInput): IBootstrapOptions {
  const env = input.env ?? process.env;
  const osHomeDir = input.osHomeDir ?? homedir();
  const homeDir = resolveKimiHome(input.homeDir, env, osHomeDir);
  const configPath = input.configPath ?? join(homeDir, 'config.toml');
  return {
    homeDir,
    configPath,
    osHomeDir,
    platform: input.platform ?? process.platform,
    arch: input.arch ?? process.arch,
    cwd: input.cwd ?? process.cwd(),
    env,
    clientIdentity: input.clientIdentity,
    args: resolveHostArgs(input.args),
  };
}

export function bootstrapSeed(input: BootstrapInput): ScopeSeed {
  return [
    [
      IBootstrapOptions as ServiceIdentifier<unknown>,
      resolveBootstrapOptions(input),
    ],
  ];
}

export interface BootstrapResult {
  readonly app: Scope;
}

export function bootstrap(input: BootstrapInput, extraSeeds: ScopeSeed = []): BootstrapResult {
  const options = resolveBootstrapOptions(input);
  const app = createAppScope({
    seeds: [...bootstrapSeed(input), ...storageSeed(options), ...skillSeed(), ...extraSeeds],
  });
  return { app };
}

function storageSeed(options: IBootstrapOptions): ScopeSeed {
  const file = (): SyncDescriptor<IFileSystemStorageService> =>
    new SyncDescriptor(FileStorageService, [options.homeDir, 0o700, 0o600]);
  return [
    [IFileSystemStorageService as ServiceIdentifier<unknown>, file()],
  ];
}

function skillSeed(): ScopeSeed {
  return [
    [
      ISkillDiscovery as ServiceIdentifier<unknown>,
      new SyncDescriptor(FileSkillDiscovery, []),
    ],
  ];
}

export function resolveKimiHome(
  homeDir?: string,
  env: NodeJS.ProcessEnv = process.env,
  osHomeDir: string = homedir(),
): string {
  return homeDir ?? env['KIMI_CODE_HOME'] ?? join(osHomeDir, '.kimi-code');
}

export function resolveConfigPath(input: {
  readonly homeDir?: string;
  readonly configPath?: string;
}): string {
  return input.configPath ?? join(resolveKimiHome(input.homeDir), 'config.toml');
}

export function ensureKimiHome(homeDir: string): void {
  mkdirSync(homeDir, { recursive: true, mode: 0o700 });
}