import { AppFileSystem } from "@opencode-ai/core/filesystem"
import * as Project from "./project"
import { context, type InstanceContext } from "./instance-context"
import { InstanceStore } from "./instance-store"

export type { InstanceContext } from "./instance-context"
export type { LoadInput } from "./instance-store"

export const Instance = {
  load(input: InstanceStore.LoadInput): Promise<InstanceContext> {
    return InstanceStore.runtime.runPromise((store) => store.load(input))
  },
  async provide<R>(input: { directory: string; init?: () => Promise<any>; fn: () => R }): Promise<R> {
    return context.provide(await Instance.load({ directory: input.directory, init: input.init }), async () =>
      input.fn(),
    )
  },
  get current() {
    return context.use()
  },
  get directory() {
    return context.use().directory
  },
  get worktree() {
    return context.use().worktree
  },
  get project() {
    return context.use().project
  },

  /**
   * Check if a path is within the project boundary.
   * Returns true if path is inside Instance.directory OR Instance.worktree.
   * Paths within the worktree but outside the working directory should not trigger external_directory permission.
   */
  containsPath(filepath: string, ctx?: InstanceContext) {
    const instance = ctx ?? Instance
    if (AppFileSystem.contains(instance.directory, filepath)) return true
    // Non-git projects set worktree to "/" which would match ANY absolute path.
    // Skip worktree check in this case to preserve external_directory permissions.
    if (instance.worktree === "/") return false
    return AppFileSystem.contains(instance.worktree, filepath)
  },
  /**
   * Captures the current instance ALS context and returns a wrapper that
   * restores it when called. Use this for callbacks that fire outside the
   * instance async context (native addons, event emitters, timers, etc.).
   */
  bind<F extends (...args: any[]) => any>(fn: F): F {
    const ctx = context.use()
    return ((...args: any[]) => context.provide(ctx, () => fn(...args))) as F
  },
  /**
   * Run a synchronous function within the given instance context ALS.
   * Use this to bridge from Effect (where InstanceRef carries context)
   * back to sync code that reads Instance.directory from ALS.
   */
  restore<R>(ctx: InstanceContext, fn: () => R): R {
    return context.provide(ctx, fn)
  },
  async reload(input: { directory: string; init?: () => Promise<any>; project?: Project.Info; worktree?: string }) {
    return InstanceStore.runtime.runPromise((store) => store.reload(input))
  },
  async dispose() {
    return InstanceStore.runtime.runPromise((store) => store.dispose(Instance.current))
  },
  async disposeAll() {
    return InstanceStore.runtime.runPromise((store) => store.disposeAll())
  },
}