import { test as base, expect, type Page } from "@playwright/test"
import { ManagedRuntime } from "effect"
import type { E2EWindow } from "../src/testing/terminal"
import type { Item, Reply, Usage } from "../../opencode/test/lib/llm-server"
import { TestLLMServer } from "../../opencode/test/lib/llm-server"
import { startBackend } from "./backend"
import {
  healthPhase,
  cleanupSession,
  cleanupTestProject,
  createTestProject,
  setHealthPhase,
  seedProjects,
  sessionIDFromUrl,
  waitSlug,
  waitSession,
} from "./actions"
import { openaiModel, withMockOpenAI } from "./prompt/mock"
import { createSdk, dirSlug, getWorktree, sessionPath } from "./utils"

type LLMFixture = {
  url: string
  push: (...input: (Item | Reply)[]) => Promise<void>
  pushMatch: (
    match: (hit: { url: URL; body: Record<string, unknown> }) => boolean,
    ...input: (Item | Reply)[]
  ) => Promise<void>
  textMatch: (
    match: (hit: { url: URL; body: Record<string, unknown> }) => boolean,
    value: string,
    opts?: { usage?: Usage },
  ) => Promise<void>
  toolMatch: (
    match: (hit: { url: URL; body: Record<string, unknown> }) => boolean,
    name: string,
    input: unknown,
  ) => Promise<void>
  text: (value: string, opts?: { usage?: Usage }) => Promise<void>
  tool: (name: string, input: unknown) => Promise<void>
  toolHang: (name: string, input: unknown) => Promise<void>
  reason: (value: string, opts?: { text?: string; usage?: Usage }) => Promise<void>
  fail: (message?: unknown) => Promise<void>
  error: (status: number, body: unknown) => Promise<void>
  hang: () => Promise<void>
  hold: (value: string, wait: PromiseLike<unknown>) => Promise<void>
  hits: () => Promise<Array<{ url: URL; body: Record<string, unknown> }>>
  calls: () => Promise<number>
  wait: (count: number) => Promise<void>
  inputs: () => Promise<Record<string, unknown>[]>
  pending: () => Promise<number>
  misses: () => Promise<Array<{ url: URL; body: Record<string, unknown> }>>
}

export const settingsKey = "settings.v3"

const seedModel = (() => {
  const [providerID = "opencode", modelID = "big-pickle"] = (
    process.env.OPENCODE_E2E_MODEL ?? "opencode/big-pickle"
  ).split("/")
  return {
    providerID: providerID || "opencode",
    modelID: modelID || "big-pickle",
  }
})()

type ProjectHandle = {
  directory: string
  slug: string
  gotoSession: (sessionID?: string) => Promise<void>
  trackSession: (sessionID: string, directory?: string) => void
  trackDirectory: (directory: string) => void
  sdk: ReturnType<typeof createSdk>
}

type ProjectOptions = {
  extra?: string[]
  model?: { providerID: string; modelID: string }
  setup?: (directory: string) => Promise<void>
  beforeGoto?: (project: { directory: string; sdk: ReturnType<typeof createSdk> }) => Promise<void>
}

type TestFixtures = {
  llm: LLMFixture
  sdk: ReturnType<typeof createSdk>
  gotoSession: (sessionID?: string) => Promise<void>
  withProject: <T>(callback: (project: ProjectHandle) => Promise<T>, options?: ProjectOptions) => Promise<T>
  withBackendProject: <T>(callback: (project: ProjectHandle) => Promise<T>, options?: ProjectOptions) => Promise<T>
  withMockProject: <T>(callback: (project: ProjectHandle) => Promise<T>, options?: ProjectOptions) => Promise<T>
}

type WorkerFixtures = {
  backend: {
    url: string
    sdk: (directory?: string) => ReturnType<typeof createSdk>
  }
  directory: string
  slug: string
}

export const test = base.extend<TestFixtures, WorkerFixtures>({
  backend: [
    async ({}, use, workerInfo) => {
      const handle = await startBackend(`w${workerInfo.workerIndex}`)
      try {
        await use({
          url: handle.url,
          sdk: (directory?: string) => createSdk(directory, handle.url),
        })
      } finally {
        await handle.stop()
      }
    },
    { scope: "worker" },
  ],
  llm: async ({}, use) => {
    const rt = ManagedRuntime.make(TestLLMServer.layer)
    try {
      const svc = await rt.runPromise(TestLLMServer.asEffect())
      await use({
        url: svc.url,
        push: (...input) => rt.runPromise(svc.push(...input)),
        pushMatch: (match, ...input) => rt.runPromise(svc.pushMatch(match, ...input)),
        textMatch: (match, value, opts) => rt.runPromise(svc.textMatch(match, value, opts)),
        toolMatch: (match, name, input) => rt.runPromise(svc.toolMatch(match, name, input)),
        text: (value, opts) => rt.runPromise(svc.text(value, opts)),
        tool: (name, input) => rt.runPromise(svc.tool(name, input)),
        toolHang: (name, input) => rt.runPromise(svc.toolHang(name, input)),
        reason: (value, opts) => rt.runPromise(svc.reason(value, opts)),
        fail: (message) => rt.runPromise(svc.fail(message)),
        error: (status, body) => rt.runPromise(svc.error(status, body)),
        hang: () => rt.runPromise(svc.hang),
        hold: (value, wait) => rt.runPromise(svc.hold(value, wait)),
        hits: () => rt.runPromise(svc.hits),
        calls: () => rt.runPromise(svc.calls),
        wait: (count) => rt.runPromise(svc.wait(count)),
        inputs: () => rt.runPromise(svc.inputs),
        pending: () => rt.runPromise(svc.pending),
        misses: () => rt.runPromise(svc.misses),
      })
    } finally {
      await rt.dispose()
    }
  },
  page: async ({ page }, use) => {
    let boundary: string | undefined
    setHealthPhase(page, "test")
    const consoleHandler = (msg: { text(): string }) => {
      const text = msg.text()
      if (!text.includes("[e2e:error-boundary]")) return
      if (healthPhase(page) === "cleanup") {
        console.warn(`[e2e:error-boundary][cleanup-warning]\n${text}`)
        return
      }
      boundary ||= text
      console.log(text)
    }
    const pageErrorHandler = (err: Error) => {
      console.log(`[e2e:pageerror] ${err.stack || err.message}`)
    }
    page.on("console", consoleHandler)
    page.on("pageerror", pageErrorHandler)
    await use(page)
    page.off("console", consoleHandler)
    page.off("pageerror", pageErrorHandler)
    if (boundary) throw new Error(boundary)
  },
  directory: [
    async ({}, use) => {
      const directory = await getWorktree()
      await use(directory)
    },
    { scope: "worker" },
  ],
  slug: [
    async ({ directory }, use) => {
      await use(dirSlug(directory))
    },
    { scope: "worker" },
  ],
  sdk: async ({ directory }, use) => {
    await use(createSdk(directory))
  },
  gotoSession: async ({ page, directory }, use) => {
    await seedStorage(page, { directory })

    const gotoSession = async (sessionID?: string) => {
      await page.goto(sessionPath(directory, sessionID))
      await waitSession(page, { directory, sessionID })
    }
    await use(gotoSession)
  },
  withProject: async ({ page }, use) => {
    await use((callback, options) => runProject(page, callback, options))
  },
  withBackendProject: async ({ page, backend }, use) => {
    await use((callback, options) =>
      runProject(page, callback, { ...options, serverUrl: backend.url, sdk: backend.sdk }),
    )
  },
  withMockProject: async ({ page, llm, backend }, use) => {
    await use((callback, options) =>
      withMockOpenAI({
        serverUrl: backend.url,
        llmUrl: llm.url,
        fn: () =>
          runProject(page, callback, {
            ...options,
            model: options?.model ?? openaiModel,
            serverUrl: backend.url,
            sdk: backend.sdk,
          }),
      }),
    )
  },
})

async function runProject<T>(
  page: Page,
  callback: (project: ProjectHandle) => Promise<T>,
  options?: ProjectOptions & {
    serverUrl?: string
    sdk?: (directory?: string) => ReturnType<typeof createSdk>
  },
) {
  const url = options?.serverUrl
  const root = await createTestProject(url ? { serverUrl: url } : undefined)
  const sdk = options?.sdk?.(root) ?? createSdk(root, url)
  const sessions = new Map<string, string>()
  const dirs = new Set<string>()
  await options?.setup?.(root)
  await seedStorage(page, {
    directory: root,
    extra: options?.extra,
    model: options?.model,
    serverUrl: url,
  })

  const gotoSession = async (sessionID?: string) => {
    await page.goto(sessionPath(root, sessionID))
    await waitSession(page, { directory: root, sessionID, serverUrl: url })
    const current = sessionIDFromUrl(page.url())
    if (current) trackSession(current)
  }

  const trackSession = (sessionID: string, directory?: string) => {
    sessions.set(sessionID, directory ?? root)
  }

  const trackDirectory = (directory: string) => {
    if (directory !== root) dirs.add(directory)
  }

  try {
    await options?.beforeGoto?.({ directory: root, sdk })
    await gotoSession()
    const slug = await waitSlug(page)
    return await callback({ directory: root, slug, gotoSession, trackSession, trackDirectory, sdk })
  } finally {
    setHealthPhase(page, "cleanup")
    await Promise.allSettled(
      Array.from(sessions, ([sessionID, directory]) => cleanupSession({ sessionID, directory, serverUrl: url })),
    )
    await Promise.allSettled(Array.from(dirs, (directory) => cleanupTestProject(directory)))
    await cleanupTestProject(root)
    setHealthPhase(page, "test")
  }
}

async function seedStorage(
  page: Page,
  input: {
    directory: string
    extra?: string[]
    model?: { providerID: string; modelID: string }
    serverUrl?: string
  },
) {
  await seedProjects(page, input)
  await page.addInitScript((model: { providerID: string; modelID: string }) => {
    const win = window as E2EWindow
    win.__opencode_e2e = {
      ...win.__opencode_e2e,
      model: {
        enabled: true,
      },
      prompt: {
        enabled: true,
      },
      terminal: {
        enabled: true,
        terminals: {},
      },
    }
    localStorage.setItem(
      "opencode.global.dat:model",
      JSON.stringify({
        recent: [model],
        user: [],
        variant: {},
      }),
    )
  }, input.model ?? seedModel)
}

export { expect }