/** @jsxImportSource @opentui/solid */
import { testRender } from "@opentui/solid"
import { onMount } from "solid-js"
import { ArgsProvider } from "../../../../src/cli/cmd/tui/context/args"
import { ExitProvider } from "../../../../src/cli/cmd/tui/context/exit"
import { KVProvider, useKV } from "../../../../src/cli/cmd/tui/context/kv"
import { ProjectProvider, useProject } from "../../../../src/cli/cmd/tui/context/project"
import { SDKProvider, type EventSource } from "../../../../src/cli/cmd/tui/context/sdk"
import { SyncProvider, useSync } from "../../../../src/cli/cmd/tui/context/sync"
import type { GlobalEvent } from "@opencode-ai/sdk/v2"

export const worktree = "/tmp/opencode"
export const directory = `${worktree}/packages/opencode`

export async function wait(fn: () => boolean, timeout = 2000) {
  const start = Date.now()
  while (!fn()) {
    if (Date.now() - start > timeout) throw new Error("timed out waiting for condition")
    await Bun.sleep(10)
  }
}

export function json(data: unknown, init?: ResponseInit) {
  return new Response(JSON.stringify(data), {
    ...init,
    headers: { "content-type": "application/json", ...(init?.headers ?? {}) },
  })
}

export function eventSource(): EventSource {
  return { subscribe: async () => () => {} }
}

export function createEventSource() {
  let fn: ((event: GlobalEvent) => void) | undefined

  return {
    source: {
      subscribe: async (handler: (event: GlobalEvent) => void) => {
        fn = handler
        return () => {
          if (fn === handler) fn = undefined
        }
      },
    } satisfies EventSource,
    emit(event: GlobalEvent) {
      if (!fn) throw new Error("event source not ready")
      fn(event)
    },
  }
}

type FetchHandler = (url: URL) => Response | Promise<Response> | undefined

export function createFetch(override?: FetchHandler) {
  const session = [] as URL[]
  const fetch = (async (input: RequestInfo | URL) => {
    const url = new URL(input instanceof Request ? input.url : String(input))
    if (url.pathname === "/session") session.push(url)

    const overridden = await override?.(url)
    if (overridden) return overridden

    switch (url.pathname) {
      case "/agent":
      case "/command":
      case "/experimental/workspace":
      case "/experimental/workspace/status":
      case "/formatter":
      case "/lsp":
        return json([])
      case "/config":
      case "/experimental/resource":
      case "/mcp":
      case "/provider/auth":
      case "/session/status":
        return json({})
      case "/config/providers":
        return json({ providers: {}, default: {} })
      case "/experimental/console":
        return json({ consoleManagedProviders: [], switchableOrgCount: 0 })
      case "/path":
        return json({ home: "", state: "", config: "", worktree, directory })
      case "/project/current":
        return json({ id: "proj_test" })
      case "/provider":
        return json({ all: [], default: {}, connected: [] })
      case "/session":
        return json([])
      case "/vcs":
        return json({ branch: "main" })
    }

    throw new Error(`unexpected request: ${url.pathname}`)
  }) as typeof globalThis.fetch

  return { fetch, session }
}

type Ctx = { kv: ReturnType<typeof useKV>; project: ReturnType<typeof useProject>; sync: ReturnType<typeof useSync> }

export async function mount(override?: FetchHandler) {
  const calls = createFetch(override)
  const events = createEventSource()
  let sync!: ReturnType<typeof useSync>
  let project!: ReturnType<typeof useProject>
  let kv!: ReturnType<typeof useKV>
  let done!: () => void
  const ready = new Promise<void>((resolve) => {
    done = resolve
  })

  function Probe() {
    const ctx: Ctx = { kv: useKV(), project: useProject(), sync: useSync() }
    onMount(() => {
      sync = ctx.sync
      project = ctx.project
      kv = ctx.kv
      done()
    })
    return <box />
  }

  const app = await testRender(() => (
    <ArgsProvider>
      <ExitProvider>
        <KVProvider>
          <SDKProvider url="http://test" directory={directory} fetch={calls.fetch} events={events.source}>
            <ProjectProvider>
              <SyncProvider>
                <Probe />
              </SyncProvider>
            </ProjectProvider>
          </SDKProvider>
        </KVProvider>
      </ExitProvider>
    </ArgsProvider>
  ))

  await ready
  await wait(() => sync.status === "complete")
  return { app, emit: events.emit, kv, project, sync, session: calls.session }
}
