import * as fs from "fs/promises";

/** One skill folder: a directory under the skills root containing SKILL.md. */
export interface Skill {
  /** Frontmatter `name`, falling back to the folder name. */
  name: string;
  /** Frontmatter `description`; empty string when missing or unreadable. */
  description: string;
  /** Absolute path of the skill directory. */
  dir: string;
  /** Absolute path of SKILL.md. */
  skillMdPath: string;
  /** Eligible for jev auto-routing: has a description, not disabled, not a duplicate. */
  routable: boolean;
  /** Frontmatter `disable-model-invocation: true`. Still explicitly activatable. */
  disableModelInvocation: boolean;
  /** Human-readable problem note shown in list_skills (e.g. "frontmatter unreadable"). */
  note?: string;
}

export interface SkillIndex {
  root: string;
  skills: Skill[];
  byName: Map<string, Skill>;
  /** Skills eligible for jev routing, capped at MAX_ROUTABLE, most recently modified first. */
  routable: Skill[];
}

/** Per-chat settings, read from configSchematics. */
export interface Settings {
  threshold: number;
  maxSkills: number;
  historyTurns: number;
  maxInjectedChars: number;
  showHintWhenNoMatch: boolean;
}

export interface Turn {
  role: string;
  text: string;
}

export interface RouteInput {
  message: string;
  recentTurns: Turn[];
}

/** Returns a probability (0-1) per routable skill name that the skill applies. */
export type Judge = (input: RouteInput, skills: Skill[], signal?: AbortSignal) => Promise<Record<string, number>>;

export interface DirEntry {
  name: string;
  isDirectory: boolean;
  isFile: boolean;
}

export interface FileStat {
  mtimeMs: number;
  size: number;
  isDirectory: boolean;
  isFile: boolean;
}

/** Minimal filesystem surface used by the plugin, so tests can supply an in-memory one. */
export interface SkillFs {
  readdir(dir: string): Promise<DirEntry[]>;
  stat(path: string): Promise<FileStat>;
  readFile(path: string): Promise<Buffer>;
  realpath(path: string): Promise<string>;
}

export const nodeFs: SkillFs = {
  async readdir(dir) {
    const entries = await fs.readdir(dir, { withFileTypes: true });
    return entries.map(e => ({ name: e.name, isDirectory: e.isDirectory(), isFile: e.isFile() }));
  },
  async stat(path) {
    const s = await fs.stat(path);
    return { mtimeMs: s.mtimeMs, size: s.size, isDirectory: s.isDirectory(), isFile: s.isFile() };
  },
  readFile: path => fs.readFile(path),
  realpath: path => fs.realpath(path),
};

export const JEV_TIMEOUT_MS = 6000;
export const TOOL_READ_CAP = 40_000;
export const MAX_ROUTABLE = 40;
export const HISTORY_TEXT_CAP = 500;
export const TREE_MAX_DEPTH = 4;

import * as fs from "fs/promises";

/** One skill folder: a directory under the skills root containing SKILL.md. */
export interface Skill {
  /** Frontmatter `name`, falling back to the folder name. */
  name: string;
  /** Frontmatter `description`; empty string when missing or unreadable. */
  description: string;
  /** Absolute path of the skill directory. */
  dir: string;
  /** Absolute path of SKILL.md. */
  skillMdPath: string;
  /** Eligible for jev auto-routing: has a description, not disabled, not a duplicate. */
  routable: boolean;
  /** Frontmatter `disable-model-invocation: true`. Still explicitly activatable. */
  disableModelInvocation: boolean;
  /** Human-readable problem note shown in list_skills (e.g. "frontmatter unreadable"). */
  note?: string;
}

export interface SkillIndex {
  root: string;
  skills: Skill[];
  byName: Map<string, Skill>;
  /** Skills eligible for jev routing, capped at MAX_ROUTABLE, most recently modified first. */
  routable: Skill[];
}

/** Per-chat settings, read from configSchematics. */
export interface Settings {
  threshold: number;
  maxSkills: number;
  historyTurns: number;
  maxInjectedChars: number;
  showHintWhenNoMatch: boolean;
}

export interface Turn {
  role: string;
  text: string;
}

export interface RouteInput {
  message: string;
  recentTurns: Turn[];
}

/** Returns a probability (0-1) per routable skill name that the skill applies. */
export type Judge = (input: RouteInput, skills: Skill[], signal?: AbortSignal) => Promise<Record<string, number>>;

export interface DirEntry {
  name: string;
  isDirectory: boolean;
  isFile: boolean;
}

export interface FileStat {
  mtimeMs: number;
  size: number;
  isDirectory: boolean;
  isFile: boolean;
}

/** Minimal filesystem surface used by the plugin, so tests can supply an in-memory one. */
export interface SkillFs {
  readdir(dir: string): Promise<DirEntry[]>;
  stat(path: string): Promise<FileStat>;
  readFile(path: string): Promise<Buffer>;
  realpath(path: string): Promise<string>;
}

export const nodeFs: SkillFs = {
  async readdir(dir) {
    const entries = await fs.readdir(dir, { withFileTypes: true });
    return entries.map(e => ({ name: e.name, isDirectory: e.isDirectory(), isFile: e.isFile() }));
  },
  async stat(path) {
    const s = await fs.stat(path);
    return { mtimeMs: s.mtimeMs, size: s.size, isDirectory: s.isDirectory(), isFile: s.isFile() };
  },
  readFile: path => fs.readFile(path),
  realpath: path => fs.realpath(path),
};

export const JEV_TIMEOUT_MS = 6000;
export const TOOL_READ_CAP = 40_000;
export const MAX_ROUTABLE = 40;
export const HISTORY_TEXT_CAP = 500;
export const TREE_MAX_DEPTH = 4;