import type { AdapterSkillConfig } from "./types.js";

/**
 * Static configuration for all known adapter types.
 * This is the single source of truth for skill directory paths, formats, and
 * install capability across the Nexus adapter ecosystem.
 */
const ADAPTER_SKILL_CONFIGS: readonly AdapterSkillConfig[] = [
  {
    adapterType: "claude_local",
    skillDir: "~/.claude/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "hermes_local",
    skillDir: "~/.hermes/skills/",
    nativeSkillDir: "~/.hermes/skills/",
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "openclaw_gateway",
    skillDir: "~/.openclaw/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "codex_local",
    skillDir: "~/.agents/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "cursor",
    skillDir: "~/.cursor/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "opencode_local",
    skillDir: "~/.config/opencode/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "pi_local",
    skillDir: "~/.pi/agent/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "gemini_local",
    skillDir: "~/.gemini/skills/",
    nativeSkillDir: null,
    format: "skill-md",
    supportsInstall: true,
    unsupportedReason: null,
  },
  {
    adapterType: "process",
    skillDir: null,
    nativeSkillDir: null,
    format: "none",
    supportsInstall: false,
    unsupportedReason: "Skills not supported for this adapter type",
  },
  {
    adapterType: "http",
    skillDir: null,
    nativeSkillDir: null,
    format: "none",
    supportsInstall: false,
    unsupportedReason: "Skills not supported for this adapter type",
  },
];

/** Lookup index built from the static config array for O(1) resolution. */
const CONFIG_BY_TYPE = new Map<string, AdapterSkillConfig>(
  ADAPTER_SKILL_CONFIGS.map((cfg) => [cfg.adapterType, cfg]),
);

/** Fallback returned for unknown adapter types — never throws. */
const FALLBACK_CONFIG: AdapterSkillConfig = {
  adapterType: "unknown",
  skillDir: null,
  nativeSkillDir: null,
  format: "none",
  supportsInstall: false,
  unsupportedReason: "Unknown adapter type — skills not supported",
};

/**
 * Returns the AdapterSkillConfig for the given adapter type.
 * Unknown types receive a safe fallback config with supportsInstall: false.
 * Never throws.
 */
export function resolveAdapterSkillConfig(adapterType: string): AdapterSkillConfig {
  return CONFIG_BY_TYPE.get(adapterType) ?? { ...FALLBACK_CONFIG, adapterType };
}

/**
 * Returns all registered adapter skill configs (one per known adapter type).
 */
export function listAdapterSkillConfigs(): readonly AdapterSkillConfig[] {
  return ADAPTER_SKILL_CONFIGS;
}