export * as Project from "./project"

import { Context, Effect, Layer, Schema } from "effect"
import path from "path"
import { AbsolutePath, withStatics } from "./schema"
import { AppFileSystem } from "./filesystem"
import { Git } from "./git"
import { Hash } from "./util/hash"

export const ID = Schema.String.pipe(
  Schema.brand("Project.ID"),
  withStatics((schema) => ({
    global: schema.make("global"),
  })),
)
export type ID = typeof ID.Type

export const Vcs = Schema.Union([
  Schema.Struct({
    type: Schema.Literal("git"),
    store: AbsolutePath,
  }),
])
export type Vcs = typeof Vcs.Type

export class Info extends Schema.Class<Info>("Project.Info")({
  id: ID,
  vcs: Schema.optional(Vcs),
}) {}

export interface Interface {
  readonly resolve: (input: AbsolutePath) => Effect.Effect<
    {
      previous?: ID
      id: ID
      directory: AbsolutePath
      vcs?: Vcs
    },
    never
  >
  /**
   * Temporary bridge method for writing the resolved project ID to the repo-local cache.
   *
   * This exists while the old opencode project service and this core project
   * service work together: core resolves the ID, while the old service still owns
   * database migration and persistence. The old service should call this after it
   * finishes migrating from `resolve().previous` to `resolve().id`; once project
   * persistence moves into core, this separate bridge method can go away.
   */
  readonly commit: (input: { store: AbsolutePath; id: ID }) => Effect.Effect<void>
}

export class Service extends Context.Service<Service, Interface>()("@opencode/ProjectV2") {}

export const layer = Layer.effect(
  Service,
  Effect.gen(function* () {
    const fs = yield* AppFileSystem.Service
    const git = yield* Git.Service

    const cached = Effect.fnUntraced(function* (dir: string) {
      return yield* fs.readFileString(path.join(dir, "opencode")).pipe(
        Effect.map((value) => value.trim()),
        Effect.map((value) => (value ? ID.make(value) : undefined)),
        Effect.catch(() => Effect.succeed(undefined)),
      )
    })

    const remote = Effect.fnUntraced(function* (repo: Git.Repo) {
      const origin = yield* git.remote(repo)
      if (!origin) return undefined
      const normalized = url(origin)
      if (!normalized) return undefined
      return ID.make(Hash.fast(`git-remote:${normalized}`))
    })

    function url(input: string) {
      const value = input.trim()
      if (!value) return undefined

      try {
        const parsed = new URL(value)
        if (parsed.protocol === "file:") return undefined
        return parts(parsed.hostname, parsed.pathname)
      } catch {
        const scp = value.match(/^([^@/:]+@)?([^/:]+):(.+)$/)
        if (scp) return parts(scp[2], scp[3])
        return undefined
      }
    }

    function parts(host: string, name: string) {
      const pathname = name
        .replace(/^\/+/, "")
        .replace(/\.git\/?$/, "")
        .replace(/\/+$/, "")
      if (!host || !pathname) return undefined
      return `${host.toLowerCase()}/${pathname}`
    }

    const root = Effect.fnUntraced(function* (repo: Git.Repo) {
      const root = (yield* git.roots(repo))[0]
      return root ? ID.make(root) : undefined
    })

    const resolve = Effect.fn("Project.resolve")(function* (input: AbsolutePath) {
      const repo = yield* git.find(input)
      if (!repo) return { id: ID.global, directory: input, vcs: undefined }

      const previous = yield* cached(repo.store)
      const id = (yield* remote(repo)) ?? previous ?? (yield* root(repo))

      return {
        previous,
        id: id ?? ID.global,
        directory: repo.directory,
        vcs: { type: "git" as const, store: repo.store },
      }
    })

    const commit = Effect.fn("Project.commit")(function* (input: { store: AbsolutePath; id: ID }) {
      yield* fs.writeFileString(path.join(input.store, "opencode"), input.id).pipe(Effect.ignore)
    })

    return Service.of({ resolve, commit })
  }),
)

export const defaultLayer = layer.pipe(Layer.provide(AppFileSystem.defaultLayer), Layer.provide(Git.defaultLayer))