import { AISDK } from "@opencode-ai/core/aisdk"
import { describe, expect } from "bun:test"
import { Effect } from "effect"
import { Catalog } from "@opencode-ai/core/catalog"
import { ModelV2 } from "@opencode-ai/core/model"
import { PluginV2 } from "@opencode-ai/core/plugin"
import { PluginHost } from "@opencode-ai/core/plugin/host"
import { CloudflareWorkersAIPlugin } from "@opencode-ai/core/plugin/provider/cloudflare-workers-ai"
import { ProviderV2 } from "@opencode-ai/core/provider"
import type { LanguageModelV3 } from "@ai-sdk/provider"
import { testEffect } from "../lib/effect"
import { PluginTestLayer } from "./fixture"

const it = testEffect(PluginTestLayer)

const addPlugin = Effect.fn(function* () {
  const plugin = yield* PluginV2.Service
  const aisdk = yield* AISDK.Service
  const host = yield* PluginHost.make(plugin)
  yield* CloudflareWorkersAIPlugin.effect(host)
})

function required<T>(value: T | undefined): T {
  if (value === undefined) throw new Error("Expected value")
  return value
}

function withEnv<A, E, R>(vars: Record<string, string | undefined>, effect: () => Effect.Effect<A, E, R>) {
  return Effect.acquireUseRelease(
    Effect.sync(() => {
      const previous = Object.fromEntries(Object.keys(vars).map((key) => [key, process.env[key]]))
      Object.entries(vars).forEach(([key, value]) => {
        if (value === undefined) delete process.env[key]
        else process.env[key] = value
      })
      return previous
    }),
    effect,
    (previous) =>
      Effect.sync(() =>
        Object.entries(previous).forEach(([key, value]) => {
          if (value === undefined) delete process.env[key]
          else process.env[key] = value
        }),
      ),
  )
}

function fakeSelectorSdk(calls: string[]) {
  const make = (method: string) => (id: string) => {
    calls.push(`${method}:${id}`)
    return { modelId: id, provider: method, specificationVersion: "v3" } as unknown as LanguageModelV3
  }
  return {
    responses: make("responses"),
    messages: make("messages"),
    chat: make("chat"),
    languageModel: make("languageModel"),
  }
}

function cloudflareLanguage(sdk: unknown, modelID = "@cf/model") {
  return (sdk as { languageModel: (id: string) => { config: CloudflareConfig; provider: string } }).languageModel(
    modelID,
  )
}

type CloudflareConfig = {
  url: (input: { path: string; modelId: string }) => string
  headers: () => Record<string, string> | Promise<Record<string, string>>
}

function cloudflareURL(sdk: unknown, modelID = "@cf/model") {
  return cloudflareLanguage(sdk, modelID).config.url({ path: "/chat/completions", modelId: modelID })
}

function cloudflareHeaders(sdk: unknown, modelID = "@cf/model") {
  return cloudflareLanguage(sdk, modelID).config.headers()
}

describe("CloudflareWorkersAIPlugin", () => {
  it.effect("maps account ID to endpoint URL and creates an OpenAI-compatible SDK", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "acct", CLOUDFLARE_API_KEY: "key" }, () =>
      Effect.gen(function* () {
        const plugin = yield* PluginV2.Service
        const aisdk = yield* AISDK.Service
        const catalog = yield* Catalog.Service
        yield* catalog.transform((catalog) =>
          catalog.provider.update(ProviderV2.ID.make("cloudflare-workers-ai"), (provider) => {
            provider.api = { type: "aisdk", package: "test-provider" }
          }),
        )
        yield* addPlugin()
        const provider = required(yield* catalog.provider.get(ProviderV2.ID.make("cloudflare-workers-ai")))
        const sdk = yield* aisdk.runSDK({
          model: ModelV2.Info.make({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("@cf/model")),
            api: { id: ModelV2.ID.make("@cf/model"), ...provider.api },
          }),
          package: "@ai-sdk/openai-compatible",
          options: { name: "cloudflare-workers-ai", headers: { custom: "header" } },
        })
        expect(provider.api).toEqual({
          type: "aisdk",
          package: "test-provider",
          url: "https://api.cloudflare.com/client/v4/accounts/acct/ai/v1",
        })
        expect(sdk.sdk).toBeDefined()
      }),
    ),
  )

  it.effect("preserves a configured endpoint URL instead of deriving one from account ID", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "acct" }, () =>
      Effect.gen(function* () {
        const catalog = yield* Catalog.Service
        yield* catalog.transform((catalog) =>
          catalog.provider.update(ProviderV2.ID.make("cloudflare-workers-ai"), (provider) => {
            provider.api = { type: "aisdk", package: "test-provider", url: "https://proxy.example/v1" }
          }),
        )
        yield* addPlugin()
        expect(required(yield* catalog.provider.get(ProviderV2.ID.make("cloudflare-workers-ai"))).api).toEqual({
          type: "aisdk",
          package: "test-provider",
          url: "https://proxy.example/v1",
        })
      }),
    ),
  )

  it.effect("allows a configured baseURL without account ID", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: undefined, CLOUDFLARE_API_KEY: "key" }, () =>
      Effect.gen(function* () {
        const plugin = yield* PluginV2.Service
        const aisdk = yield* AISDK.Service
        yield* addPlugin()
        const result = yield* aisdk.runSDK({
          model: ModelV2.Info.make({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("@cf/model")),
            api: {
              id: ModelV2.ID.make("@cf/model"),
              type: "aisdk",
              package: "@ai-sdk/openai-compatible",
              url: "https://proxy.example/v1",
            },
          }),
          package: "@ai-sdk/openai-compatible",
          options: { name: "cloudflare-workers-ai", baseURL: "https://proxy.example/v1" },
        })
        expect(cloudflareURL(result.sdk)).toBe("https://proxy.example/v1/chat/completions")
      }),
    ),
  )

  it.effect("uses env account ID over configured account ID", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "env-acct" }, () =>
      Effect.gen(function* () {
        const catalog = yield* Catalog.Service
        yield* catalog.transform((catalog) =>
          catalog.provider.update(ProviderV2.ID.make("cloudflare-workers-ai"), (provider) => {
            provider.api = { type: "aisdk", package: "test-provider" }
            provider.request.body.accountId = "configured-acct"
          }),
        )
        yield* addPlugin()
        expect(required(yield* catalog.provider.get(ProviderV2.ID.make("cloudflare-workers-ai"))).api).toEqual({
          type: "aisdk",
          package: "test-provider",
          url: "https://api.cloudflare.com/client/v4/accounts/env-acct/ai/v1",
        })
      }),
    ),
  )

  it.effect("uses env API key over auth or configured API key and keeps the Cloudflare User-Agent", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "acct", CLOUDFLARE_API_KEY: "env-key" }, () =>
      Effect.gen(function* () {
        const plugin = yield* PluginV2.Service
        const aisdk = yield* AISDK.Service
        yield* addPlugin()
        const result = yield* aisdk.runSDK({
          model: ModelV2.Info.make({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("@cf/model")),
            api: {
              id: ModelV2.ID.make("@cf/model"),
              type: "aisdk",
              package: "@ai-sdk/openai-compatible",
              url: "https://proxy.example/v1",
            },
          }),
          package: "@ai-sdk/openai-compatible",
          options: {
            name: "cloudflare-workers-ai",
            apiKey: "auth-key",
            baseURL: "https://proxy.example/v1",
            headers: { custom: "header" },
          },
        })
        const headers = yield* Effect.promise(() => Promise.resolve(cloudflareHeaders(result.sdk)))
        expect(headers.authorization).toBe("Bearer env-key")
        expect(headers.custom).toBe("header")
        expect(headers["user-agent"]).toMatch(/^opencode\/.* cloudflare-workers-ai \(.+\) ai-sdk\/openai-compatible\//)
      }),
    ),
  )

  it.effect("expands account ID vars in endpoint URLs", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "acct", CLOUDFLARE_API_KEY: "key" }, () =>
      Effect.gen(function* () {
        const plugin = yield* PluginV2.Service
        const aisdk = yield* AISDK.Service
        yield* addPlugin()
        const result = yield* aisdk.runSDK({
          model: ModelV2.Info.make({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("@cf/model")),
            api: {
              id: ModelV2.ID.make("@cf/model"),
              type: "aisdk",
              package: "@ai-sdk/openai-compatible",
              url: "https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/ai/v1",
            },
          }),
          package: "@ai-sdk/openai-compatible",
          options: {
            name: "cloudflare-workers-ai",
            baseURL: "https://api.cloudflare.com/client/v4/accounts/${CLOUDFLARE_ACCOUNT_ID}/ai/v1",
          },
        })
        expect(cloudflareURL(result.sdk)).toBe(
          "https://api.cloudflare.com/client/v4/accounts/acct/ai/v1/chat/completions",
        )
      }),
    ),
  )

  it.effect("selects languageModel with the API model ID", () =>
    Effect.gen(function* () {
      const plugin = yield* PluginV2.Service
      const aisdk = yield* AISDK.Service
      const calls: string[] = []
      yield* addPlugin()
      const result = yield* aisdk.runLanguage({
        model: ModelV2.Info.make({
          ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("alias")),
          api: { id: ModelV2.ID.make("@cf/api-model"), type: "aisdk", package: "test-provider" },
        }),
        sdk: fakeSelectorSdk(calls),
        options: {},
      })
      expect(result.language).toBeDefined()
      expect(calls).toEqual(["languageModel:@cf/api-model"])
    }),
  )

  it.effect("does not create an SDK for non OpenAI-compatible packages", () =>
    withEnv({ CLOUDFLARE_ACCOUNT_ID: "acct", CLOUDFLARE_API_KEY: "key" }, () =>
      Effect.gen(function* () {
        const plugin = yield* PluginV2.Service
        const aisdk = yield* AISDK.Service
        yield* addPlugin()
        const result = yield* aisdk.runSDK({
          model: ModelV2.Info.make({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cloudflare-workers-ai"), ModelV2.ID.make("@cf/model")),
            api: {
              id: ModelV2.ID.make("@cf/model"),
              type: "aisdk",
              package: "@ai-sdk/anthropic",
              url: "https://proxy.example/v1",
            },
          }),
          package: "@ai-sdk/anthropic",
          options: { name: "cloudflare-workers-ai" },
        })
        expect(result.sdk).toBeUndefined()
      }),
    ),
  )
})