import { describe, expect, mock } from "bun:test"
import { Effect } from "effect"
import { PluginV2 } from "@opencode-ai/core/plugin"
import { CloudflareAIGatewayPlugin } from "@opencode-ai/core/plugin/provider/cloudflare-ai-gateway"
import { it, model, withEnv } from "./provider-helper"

const aiGatewayCalls: Record<string, unknown>[] = []
const unifiedCalls: string[] = []
const gatewayModelCalls: unknown[] = []

function captureAiGatewayOptions(options: Record<string, unknown>) {
  const nested =
    options.options && typeof options.options === "object" ? (options.options as Record<string, unknown>) : undefined
  return {
    ...options,
    ...(nested
      ? {
          options: {
            ...nested,
            headers:
              nested.headers && typeof nested.headers === "object"
                ? { ...(nested.headers as Record<string, unknown>) }
                : nested.headers,
          },
        }
      : {}),
  }
}

function resetCalls() {
  aiGatewayCalls.length = 0
  unifiedCalls.length = 0
  gatewayModelCalls.length = 0
}

function cloudflareEnv(overrides: Record<string, string | undefined> = {}) {
  return {
    CLOUDFLARE_ACCOUNT_ID: "env-account",
    CLOUDFLARE_GATEWAY_ID: "env-gateway",
    CLOUDFLARE_API_TOKEN: "env-token",
    CF_AIG_TOKEN: undefined,
    ...overrides,
  }
}

mock.module("ai-gateway-provider", () => ({
  createAiGateway(options: Record<string, unknown>) {
    aiGatewayCalls.push(captureAiGatewayOptions(options))
    return (input: unknown) => {
      gatewayModelCalls.push(input)
      return {
        modelId: input,
        provider: "cloudflare-ai-gateway",
        specificationVersion: "v3",
      }
    }
  },
}))

mock.module("ai-gateway-provider/providers/unified", () => ({
  createUnified() {
    return (modelID: string) => {
      unifiedCalls.push(modelID)
      return { unifiedModelID: modelID }
    }
  },
}))

describe("CloudflareAIGatewayPlugin", () => {
  it.effect("requires account, gateway, and token before creating the unified SDK", () =>
    withEnv(
      {
        CLOUDFLARE_ACCOUNT_ID: "acct",
        CLOUDFLARE_GATEWAY_ID: "gateway",
        CLOUDFLARE_API_TOKEN: "token",
        CF_AIG_TOKEN: undefined,
      },
      () =>
        Effect.gen(function* () {
          const plugin = yield* PluginV2.Service
          yield* plugin.add(CloudflareAIGatewayPlugin)
          const result = yield* plugin.trigger(
            "aisdk.sdk",
            {
              model: model("cloudflare-ai-gateway", "openai/gpt-5"),
              package: "ai-gateway-provider",
              options: { name: "cloudflare-ai-gateway" },
            },
            {},
          )
          expect(result.sdk.languageModel("openai/gpt-5")).toBeDefined()
        }),
    ),
  )

  it.effect("passes legacy metadata, cache, log, and User-Agent values under the AI Gateway options key", () =>
    withEnv(cloudflareEnv(), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: {
              name: "cloudflare-ai-gateway",
              metadata: { invoked_by: "test", project: "opencode" },
              cacheTtl: 300,
              cacheKey: "cache-key",
              skipCache: true,
              collectLog: false,
            },
          },
          {},
        )

        expect(aiGatewayCalls).toHaveLength(1)
        expect(aiGatewayCalls[0]).toEqual({
          accountId: "env-account",
          gateway: "env-gateway",
          apiKey: "env-token",
          options: {
            metadata: { invoked_by: "test", project: "opencode" },
            cacheTtl: 300,
            cacheKey: "cache-key",
            skipCache: true,
            collectLog: false,
            headers: {
              "User-Agent": expect.stringContaining("opencode/"),
            },
          },
        })
      }),
    ),
  )

  it.effect("parses legacy cf-aig-metadata header when metadata option is absent", () =>
    withEnv(cloudflareEnv(), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: {
              name: "cloudflare-ai-gateway",
              headers: {
                "cf-aig-metadata": JSON.stringify({ invoked_by: "header", project: "opencode" }),
              },
            },
          },
          {},
        )

        expect(aiGatewayCalls[0]?.options).toMatchObject({
          metadata: { invoked_by: "header", project: "opencode" },
        })
      }),
    ),
  )

  it.effect("prefers Cloudflare env values over auth/config-derived options", () =>
    withEnv(cloudflareEnv(), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: {
              name: "cloudflare-ai-gateway",
              accountId: "auth-account",
              gateway: "auth-gateway",
              apiKey: "auth-token",
            },
          },
          {},
        )

        expect(aiGatewayCalls[0]).toMatchObject({
          accountId: "env-account",
          gateway: "env-gateway",
          apiKey: "env-token",
        })
      }),
    ),
  )

  it.effect("accepts gatewayId metadata copied from auth into provider options", () =>
    withEnv(
      cloudflareEnv({
        CLOUDFLARE_ACCOUNT_ID: undefined,
        CLOUDFLARE_GATEWAY_ID: undefined,
        CLOUDFLARE_API_TOKEN: undefined,
      }),
      () =>
        Effect.gen(function* () {
          resetCalls()
          const plugin = yield* PluginV2.Service
          yield* plugin.add(CloudflareAIGatewayPlugin)

          yield* plugin.trigger(
            "aisdk.sdk",
            {
              model: model("cloudflare-ai-gateway", "openai/gpt-5"),
              package: "ai-gateway-provider",
              options: {
                name: "cloudflare-ai-gateway",
                accountId: "auth-account",
                gatewayId: "auth-gateway",
                apiKey: "auth-token",
              },
            },
            {},
          )

          expect(aiGatewayCalls[0]).toMatchObject({
            accountId: "auth-account",
            gateway: "auth-gateway",
            apiKey: "auth-token",
          })
        }),
    ),
  )

  it.effect("falls back to CF_AIG_TOKEN when CLOUDFLARE_API_TOKEN is unset", () =>
    withEnv(cloudflareEnv({ CLOUDFLARE_API_TOKEN: undefined, CF_AIG_TOKEN: "cf-aig-token" }), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: { name: "cloudflare-ai-gateway" },
          },
          {},
        )

        expect(aiGatewayCalls[0]).toMatchObject({ apiKey: "cf-aig-token" })
      }),
    ),
  )

  it.effect("does not create an SDK when account and gateway IDs are missing", () =>
    withEnv(cloudflareEnv({ CLOUDFLARE_ACCOUNT_ID: undefined, CLOUDFLARE_GATEWAY_ID: undefined }), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        const result = yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: { name: "cloudflare-ai-gateway" },
          },
          {},
        )

        expect(result.sdk).toBeUndefined()
        expect(aiGatewayCalls).toHaveLength(0)
      }),
    ),
  )

  it.effect("does not create an SDK when the token is missing", () =>
    withEnv(cloudflareEnv({ CLOUDFLARE_API_TOKEN: undefined, CF_AIG_TOKEN: undefined }), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        const result = yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "ai-gateway-provider",
            options: { name: "cloudflare-ai-gateway" },
          },
          {},
        )

        expect(result.sdk).toBeUndefined()
        expect(aiGatewayCalls).toHaveLength(0)
      }),
    ),
  )

  it.effect("does not replace a configured baseURL with the Cloudflare AI Gateway SDK", () =>
    withEnv(
      cloudflareEnv({
        CLOUDFLARE_ACCOUNT_ID: undefined,
        CLOUDFLARE_GATEWAY_ID: undefined,
        CLOUDFLARE_API_TOKEN: undefined,
      }),
      () =>
        Effect.gen(function* () {
          resetCalls()
          const plugin = yield* PluginV2.Service
          yield* plugin.add(CloudflareAIGatewayPlugin)

          const result = yield* plugin.trigger(
            "aisdk.sdk",
            {
              model: model("cloudflare-ai-gateway", "openai/gpt-5"),
              package: "ai-gateway-provider",
              options: { name: "cloudflare-ai-gateway", baseURL: "https://proxy.example/v1" },
            },
            {},
          )

          expect(result.sdk).toBeUndefined()
          expect(aiGatewayCalls).toHaveLength(0)
        }),
    ),
  )

  it.effect("maps provider/model IDs through the unified Cloudflare provider unchanged", () =>
    withEnv(cloudflareEnv(), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        const result = yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "anthropic/claude-sonnet-4-5"),
            package: "ai-gateway-provider",
            options: { name: "cloudflare-ai-gateway" },
          },
          {},
        )

        expect(result.sdk.languageModel("anthropic/claude-sonnet-4-5")).toEqual({
          modelId: { unifiedModelID: "anthropic/claude-sonnet-4-5" },
          provider: "cloudflare-ai-gateway",
          specificationVersion: "v3",
        })
        expect(unifiedCalls).toEqual(["anthropic/claude-sonnet-4-5"])
        expect(gatewayModelCalls).toEqual([{ unifiedModelID: "anthropic/claude-sonnet-4-5" }])
      }),
    ),
  )

  it.effect("ignores non Cloudflare AI Gateway packages", () =>
    withEnv(cloudflareEnv(), () =>
      Effect.gen(function* () {
        resetCalls()
        const plugin = yield* PluginV2.Service
        yield* plugin.add(CloudflareAIGatewayPlugin)

        const result = yield* plugin.trigger(
          "aisdk.sdk",
          {
            model: model("cloudflare-ai-gateway", "openai/gpt-5"),
            package: "@ai-sdk/openai-compatible",
            options: { name: "cloudflare-ai-gateway" },
          },
          {},
        )

        expect(result.sdk).toBeUndefined()
        expect(aiGatewayCalls).toHaveLength(0)
      }),
    ),
  )
})