import { describe, expect } from "bun:test"
import { ConfigProvider, Effect, Layer, Stream } from "effect"
import { Headers, HttpClientRequest } from "effect/unstable/http"
import { LLM, LLMError } from "../../src"
import { Auth, LLMClient, RequestExecutor, WebSocketExecutor } from "../../src/route"
import * as Azure from "../../src/providers/azure"
import * as OpenAI from "../../src/providers/openai"
import * as OpenAIResponses from "../../src/protocols/openai-responses"
import * as ProviderShared from "../../src/protocols/shared"
import { it } from "../lib/effect"
import { dynamicResponse, fixedResponse } from "../lib/http"
import { sseEvents } from "../lib/sse"

const model = OpenAIResponses.model({
  id: "gpt-4.1-mini",
  baseURL: "https://api.openai.test/v1/",
  headers: { authorization: "Bearer test" },
})

const request = LLM.request({
  id: "req_1",
  model,
  system: "You are concise.",
  prompt: "Say hello.",
  generation: { maxTokens: 20, temperature: 0 },
})

const configEnv = (env: Record<string, string>) => Effect.provide(ConfigProvider.layer(ConfigProvider.fromEnv({ env })))

describe("OpenAI Responses route", () => {
  it.effect("prepares OpenAI Responses target", () =>
    Effect.gen(function* () {
      const prepared = yield* LLMClient.prepare(request)

      expect(prepared.body).toEqual({
        model: "gpt-4.1-mini",
        input: [
          { role: "system", content: "You are concise." },
          { role: "user", content: [{ type: "input_text", text: "Say hello." }] },
        ],
        stream: true,
        max_output_tokens: 20,
        temperature: 0,
      })
    }),
  )

  it.effect("prepares OpenAI Responses WebSocket target", () =>
    Effect.gen(function* () {
      const prepared = yield* LLMClient.prepare(
        LLM.updateRequest(request, {
          model: OpenAI.responsesWebSocket("gpt-4.1-mini", { baseURL: "https://api.openai.test/v1/", apiKey: "test" }),
        }),
      )

      expect(prepared.route).toBe("openai-responses-websocket")
      expect(prepared.protocol).toBe("openai-responses")
      expect(prepared.metadata).toEqual({ transport: "websocket-json" })
      expect(prepared.body).toMatchObject({ model: "gpt-4.1-mini", stream: true })
    }),
  )

  it.effect("streams OpenAI Responses over WebSocket", () =>
    Effect.gen(function* () {
      const sent: string[] = []
      const opened: Array<{ readonly url: string; readonly authorization: string | undefined }> = []
      let closed = false
      const deps = Layer.mergeAll(
        Layer.succeed(
          RequestExecutor.Service,
          RequestExecutor.Service.of({
            execute: () => Effect.die("unexpected HTTP request"),
          }),
        ),
        Layer.succeed(
          WebSocketExecutor.Service,
          WebSocketExecutor.Service.of({
            open: (input) =>
              Effect.succeed({
                sendText: (message) =>
                  Effect.sync(() => {
                    opened.push({ url: input.url, authorization: input.headers.authorization })
                    sent.push(message)
                  }),
                messages: Stream.fromArray([
                  ProviderShared.encodeJson({ type: "response.output_text.delta", item_id: "msg_1", delta: "Hi" }),
                  ProviderShared.encodeJson({ type: "response.completed", response: { id: "resp_ws" } }),
                ]),
                close: Effect.sync(() => {
                  closed = true
                }),
              }),
          }),
        ),
      )
      const response = yield* LLMClient.generate(
        LLM.request({
          model: OpenAI.responsesWebSocket("gpt-4.1-mini", { baseURL: "https://api.openai.test/v1/", apiKey: "test" }),
          prompt: "Say hello.",
        }),
      ).pipe(Effect.provide(LLMClient.layerWithWebSocket.pipe(Layer.provide(deps))))

      expect(response.text).toBe("Hi")
      expect(opened).toEqual([{ url: "wss://api.openai.test/v1/responses", authorization: "Bearer test" }])
      expect(closed).toBe(true)
      expect(sent).toHaveLength(1)
      expect(JSON.parse(sent[0])).toEqual({
        type: "response.create",
        model: "gpt-4.1-mini",
        input: [{ role: "user", content: [{ type: "input_text", text: "Say hello." }] }],
        store: false,
      })
    }),
  )

  it.effect("requires WebSocket runtime for OpenAI Responses WebSocket", () =>
    Effect.gen(function* () {
      const error = yield* LLMClient.generate(
        LLM.request({
          model: OpenAI.responsesWebSocket("gpt-4.1-mini", { baseURL: "https://api.openai.test/v1/", apiKey: "test" }),
          prompt: "Say hello.",
        }),
      ).pipe(
        Effect.provide(
          LLMClient.layer.pipe(
            Layer.provide(
              Layer.succeed(
                RequestExecutor.Service,
                RequestExecutor.Service.of({
                  execute: () => Effect.die("unexpected HTTP request"),
                }),
              ),
            ),
          ),
        ),
        Effect.flip,
      )

      expect(error.message).toContain("requires WebSocketExecutor.Service")
    }),
  )

  it.effect("fails immediately when WebSocket is already closed", () =>
    Effect.gen(function* () {
      const error = yield* WebSocketExecutor.fromWebSocket(
        { readyState: globalThis.WebSocket.CLOSED } as globalThis.WebSocket,
        { url: "wss://api.openai.test/v1/responses", headers: Headers.empty },
      ).pipe(Effect.flip)

      expect(error.message).toContain("closed before opening")
    }),
  )

  it.effect("adds native query params to the Responses URL", () =>
    Effect.gen(function* () {
      yield* LLMClient.generate(
        LLM.updateRequest(request, {
          model: OpenAIResponses.model({ ...model, queryParams: { "api-version": "v1" } }),
        }),
      ).pipe(
        Effect.provide(
          dynamicResponse((input) =>
            Effect.gen(function* () {
              const web = yield* HttpClientRequest.toWeb(input.request).pipe(Effect.orDie)
              expect(web.url).toBe("https://api.openai.test/v1/responses?api-version=v1")
              return input.respond(sseEvents({ type: "response.completed", response: {} }), {
                headers: { "content-type": "text/event-stream" },
              })
            }),
          ),
        ),
      )
    }),
  )

  it.effect("uses Azure api-key header for static OpenAI Responses keys", () =>
    Effect.gen(function* () {
      yield* LLMClient.generate(
        LLM.updateRequest(request, {
          model: Azure.responses("gpt-4.1-mini", {
            baseURL: "https://opencode-test.openai.azure.com/openai/v1/",
            apiKey: "azure-key",
            headers: { authorization: "Bearer stale" },
          }),
        }),
      ).pipe(
        Effect.provide(
          dynamicResponse((input) =>
            Effect.gen(function* () {
              const web = yield* HttpClientRequest.toWeb(input.request).pipe(Effect.orDie)
              expect(web.headers.get("api-key")).toBe("azure-key")
              expect(web.headers.get("authorization")).toBeNull()
              return input.respond(sseEvents({ type: "response.completed", response: {} }), {
                headers: { "content-type": "text/event-stream" },
              })
            }),
          ),
        ),
      )
    }),
  )

  it.effect("loads OpenAI default auth from Effect Config", () =>
    LLMClient.generate(
      LLM.updateRequest(request, {
        model: OpenAI.responses("gpt-4.1-mini", { baseURL: "https://api.openai.test/v1/" }),
      }),
    ).pipe(
      configEnv({ OPENAI_API_KEY: "env-key" }),
      Effect.provide(
        dynamicResponse((input) =>
          Effect.gen(function* () {
            const web = yield* HttpClientRequest.toWeb(input.request).pipe(Effect.orDie)
            expect(web.headers.get("authorization")).toBe("Bearer env-key")
            return input.respond(sseEvents({ type: "response.completed", response: {} }), {
              headers: { "content-type": "text/event-stream" },
            })
          }),
        ),
      ),
    ),
  )

  it.effect("lets explicit auth override OpenAI default API key auth", () =>
    LLMClient.generate(
      LLM.updateRequest(request, {
        model: OpenAI.responses("gpt-4.1-mini", {
          baseURL: "https://api.openai.test/v1/",
          auth: Auth.bearer("oauth-token"),
        }),
      }),
    ).pipe(
      Effect.provide(
        dynamicResponse((input) =>
          Effect.gen(function* () {
            const web = yield* HttpClientRequest.toWeb(input.request).pipe(Effect.orDie)
            expect(web.headers.get("authorization")).toBe("Bearer oauth-token")
            return input.respond(sseEvents({ type: "response.completed", response: {} }), {
              headers: { "content-type": "text/event-stream" },
            })
          }),
        ),
      ),
    ),
  )

  it.effect("prepares function call and function output input items", () =>
    Effect.gen(function* () {
      const prepared = yield* LLMClient.prepare(
        LLM.request({
          id: "req_tool_result",
          model,
          messages: [
            LLM.user("What is the weather?"),
            LLM.assistant([LLM.toolCall({ id: "call_1", name: "lookup", input: { query: "weather" } })]),
            LLM.toolMessage({ id: "call_1", name: "lookup", result: { forecast: "sunny" } }),
          ],
        }),
      )

      expect(prepared.body).toEqual({
        model: "gpt-4.1-mini",
        input: [
          { role: "user", content: [{ type: "input_text", text: "What is the weather?" }] },
          { type: "function_call", call_id: "call_1", name: "lookup", arguments: '{"query":"weather"}' },
          { type: "function_call_output", call_id: "call_1", output: '{"forecast":"sunny"}' },
        ],
        stream: true,
      })
    }),
  )

  it.effect("maps OpenAI provider options to Responses options", () =>
    Effect.gen(function* () {
      const prepared = yield* LLMClient.prepare<OpenAIResponses.OpenAIResponsesBody>(
        LLM.request({
          model: OpenAI.model("gpt-5.2", { baseURL: "https://api.openai.test/v1/" }),
          prompt: "think",
          providerOptions: {
            openai: {
              promptCacheKey: "session_123",
              reasoningEffort: "high",
              reasoningSummary: "auto",
              includeEncryptedReasoning: true,
            },
          },
        }),
      )

      expect(prepared.body.store).toBe(false)
      expect(prepared.body.prompt_cache_key).toBe("session_123")
      expect(prepared.body.include).toEqual(["reasoning.encrypted_content"])
      expect(prepared.body.reasoning).toEqual({ effort: "high", summary: "auto" })
      expect(prepared.body.text).toEqual({ verbosity: "low" })
    }),
  )

  it.effect("request OpenAI provider options override model defaults", () =>
    Effect.gen(function* () {
      const prepared = yield* LLMClient.prepare<OpenAIResponses.OpenAIResponsesBody>(
        LLM.request({
          model: OpenAI.model("gpt-4.1-mini", {
            baseURL: "https://api.openai.test/v1/",
            providerOptions: { openai: { promptCacheKey: "model_cache" } },
          }),
          prompt: "no cache",
          providerOptions: { openai: { promptCacheKey: "request_cache" } },
        }),
      )

      expect(prepared.body.prompt_cache_key).toBe("request_cache")
    }),
  )

  it.effect("parses text and usage stream fixtures", () =>
    Effect.gen(function* () {
      const body = sseEvents(
        { type: "response.output_text.delta", item_id: "msg_1", delta: "Hello" },
        { type: "response.output_text.delta", item_id: "msg_1", delta: "!" },
        {
          type: "response.completed",
          response: {
            id: "resp_1",
            service_tier: "default",
            usage: {
              input_tokens: 5,
              output_tokens: 2,
              total_tokens: 7,
              input_tokens_details: { cached_tokens: 1 },
              output_tokens_details: { reasoning_tokens: 0 },
            },
          },
        },
      )
      const response = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(body)))

      expect(response.text).toBe("Hello!")
      expect(response.events).toEqual([
        { type: "text-delta", id: "msg_1", text: "Hello", providerMetadata: { openai: { itemId: "msg_1" } } },
        { type: "text-delta", id: "msg_1", text: "!", providerMetadata: { openai: { itemId: "msg_1" } } },
        {
          type: "request-finish",
          reason: "stop",
          providerMetadata: { openai: { responseId: "resp_1", serviceTier: "default" } },
          usage: {
            inputTokens: 5,
            outputTokens: 2,
            reasoningTokens: 0,
            cacheReadInputTokens: 1,
            totalTokens: 7,
            native: {
              input_tokens: 5,
              output_tokens: 2,
              total_tokens: 7,
              input_tokens_details: { cached_tokens: 1 },
              output_tokens_details: { reasoning_tokens: 0 },
            },
          },
        },
      ])
    }),
  )

  it.effect("assembles streamed function call input", () =>
    Effect.gen(function* () {
      const body = sseEvents(
        {
          type: "response.output_item.added",
          item: { type: "function_call", id: "item_1", call_id: "call_1", name: "lookup", arguments: "" },
        },
        { type: "response.function_call_arguments.delta", item_id: "item_1", delta: '{"query"' },
        { type: "response.function_call_arguments.delta", item_id: "item_1", delta: ':"weather"}' },
        {
          type: "response.output_item.done",
          item: {
            type: "function_call",
            id: "item_1",
            call_id: "call_1",
            name: "lookup",
            arguments: '{"query":"weather"}',
          },
        },
        { type: "response.completed", response: { usage: { input_tokens: 5, output_tokens: 1 } } },
      )
      const response = yield* LLMClient.generate(
        LLM.updateRequest(request, {
          tools: [{ name: "lookup", description: "Lookup data", inputSchema: { type: "object" } }],
        }),
      ).pipe(Effect.provide(fixedResponse(body)))

      expect(response.events).toEqual([
        {
          type: "tool-input-delta",
          id: "call_1",
          name: "lookup",
          text: '{"query"',
          providerMetadata: { openai: { itemId: "item_1" } },
        },
        {
          type: "tool-input-delta",
          id: "call_1",
          name: "lookup",
          text: ':"weather"}',
          providerMetadata: { openai: { itemId: "item_1" } },
        },
        {
          type: "tool-call",
          id: "call_1",
          name: "lookup",
          input: { query: "weather" },
          providerMetadata: { openai: { itemId: "item_1" } },
        },
        {
          type: "request-finish",
          reason: "tool-calls",
          usage: { inputTokens: 5, outputTokens: 1, totalTokens: 6, native: { input_tokens: 5, output_tokens: 1 } },
        },
      ])
    }),
  )

  it.effect("decodes web_search_call as provider-executed tool-call + tool-result", () =>
    Effect.gen(function* () {
      const item = {
        type: "web_search_call",
        id: "ws_1",
        status: "completed",
        action: { type: "search", query: "effect 4" },
      }
      const body = sseEvents(
        { type: "response.output_item.added", item },
        { type: "response.output_item.done", item },
        { type: "response.completed", response: { usage: { input_tokens: 5, output_tokens: 1 } } },
      )
      const response = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(body)))

      const callsAndResults = response.events.filter(
        (event) => event.type === "tool-call" || event.type === "tool-result",
      )
      expect(callsAndResults).toEqual([
        {
          type: "tool-call",
          id: "ws_1",
          name: "web_search",
          input: { type: "search", query: "effect 4" },
          providerExecuted: true,
          providerMetadata: { openai: { itemId: "ws_1" } },
        },
        {
          type: "tool-result",
          id: "ws_1",
          name: "web_search",
          result: { type: "json", value: item },
          providerExecuted: true,
          providerMetadata: { openai: { itemId: "ws_1" } },
        },
      ])
    }),
  )

  it.effect("decodes code_interpreter_call as provider-executed events with code input", () =>
    Effect.gen(function* () {
      const item = {
        type: "code_interpreter_call",
        id: "ci_1",
        status: "completed",
        code: "print(1+1)",
        container_id: "cnt_xyz",
        outputs: [{ type: "logs", logs: "2\n" }],
      }
      const body = sseEvents(
        { type: "response.output_item.done", item },
        { type: "response.completed", response: { usage: { input_tokens: 5, output_tokens: 1 } } },
      )
      const response = yield* LLMClient.generate(request).pipe(Effect.provide(fixedResponse(body)))

      const toolCall = response.events.find((event) => event.type === "tool-call")
      expect(toolCall).toEqual({
        type: "tool-call",
        id: "ci_1",
        name: "code_interpreter",
        input: { code: "print(1+1)", container_id: "cnt_xyz" },
        providerExecuted: true,
        providerMetadata: { openai: { itemId: "ci_1" } },
      })
      const toolResult = response.events.find((event) => event.type === "tool-result")
      expect(toolResult).toEqual({
        type: "tool-result",
        id: "ci_1",
        name: "code_interpreter",
        result: { type: "json", value: item },
        providerExecuted: true,
        providerMetadata: { openai: { itemId: "ci_1" } },
      })
    }),
  )

  it.effect("rejects unsupported user media content", () =>
    Effect.gen(function* () {
      const error = yield* LLMClient.prepare(
        LLM.request({
          id: "req_media",
          model,
          messages: [LLM.user({ type: "media", mediaType: "image/png", data: "AAECAw==" })],
        }),
      ).pipe(Effect.flip)

      expect(error.message).toContain("OpenAI Responses user messages only support text content for now")
    }),
  )

  it.effect("emits provider-error events for mid-stream provider errors", () =>
    Effect.gen(function* () {
      const response = yield* LLMClient.generate(request).pipe(
        Effect.provide(fixedResponse(sseEvents({ type: "error", code: "rate_limit_exceeded", message: "Slow down" }))),
      )

      expect(response.events).toEqual([{ type: "provider-error", message: "Slow down" }])
    }),
  )

  it.effect("falls back to error code when no message is present", () =>
    Effect.gen(function* () {
      const response = yield* LLMClient.generate(request).pipe(
        Effect.provide(fixedResponse(sseEvents({ type: "error", code: "internal_error" }))),
      )

      expect(response.events).toEqual([{ type: "provider-error", message: "internal_error" }])
    }),
  )

  it.effect("fails HTTP provider errors before stream parsing", () =>
    Effect.gen(function* () {
      const error = yield* LLMClient.generate(request).pipe(
        Effect.provide(
          fixedResponse('{"error":{"type":"invalid_request_error","message":"Bad request"}}', {
            status: 400,
            headers: { "content-type": "application/json" },
          }),
        ),
        Effect.flip,
      )

      expect(error).toBeInstanceOf(LLMError)
      expect(error.reason).toMatchObject({ _tag: "InvalidRequest" })
      expect(error.message).toContain("HTTP 400")
    }),
  )
})