import { describe, expect, it } from "bun:test"
import type { AgentSideConnection, LoadSessionResponse, NewSessionResponse } from "@agentclientprotocol/sdk"
import type { OpencodeClient } from "@opencode-ai/sdk/v2"
import { Effect } from "effect"
import * as ACPNextService from "@/acp-next/service"
import * as ACPNextError from "@/acp-next/error"
import { ModelID, ProviderID } from "@/provider/schema"
import type { Provider } from "@/provider/provider"

const providerID = ProviderID.make("test")
const modelID = ModelID.make("test-model")
const configuredModelID = ModelID.make("configured-model")

const provider: Provider.Info = {
  id: providerID,
  name: "Test",
  source: "config",
  env: [],
  options: {},
  models: {
    [modelID]: {
      id: modelID,
      providerID,
      api: {
        id: modelID,
        url: "https://example.com",
        npm: "@ai-sdk/openai-compatible",
      },
      name: "Test Model",
      family: "test",
      capabilities: {
        temperature: true,
        reasoning: true,
        attachment: false,
        toolcall: true,
        input: { text: true, audio: false, image: false, video: false, pdf: false },
        output: { text: true, audio: false, image: false, video: false, pdf: false },
        interleaved: false,
      },
      cost: {
        input: 0,
        output: 0,
        cache: { read: 0, write: 0 },
      },
      limit: {
        context: 128000,
        output: 4096,
      },
      status: "active",
      options: {},
      headers: {},
      release_date: "2026-01-01",
      variants: {
        default: {},
        high: { reasoningEffort: "high" },
      },
    },
    [configuredModelID]: {
      id: configuredModelID,
      providerID,
      api: {
        id: configuredModelID,
        url: "https://example.com",
        npm: "@ai-sdk/openai-compatible",
      },
      name: "Configured Model",
      family: "test",
      capabilities: {
        temperature: true,
        reasoning: false,
        attachment: false,
        toolcall: true,
        input: { text: true, audio: false, image: false, video: false, pdf: false },
        output: { text: true, audio: false, image: false, video: false, pdf: false },
        interleaved: false,
      },
      cost: {
        input: 0,
        output: 0,
        cache: { read: 0, write: 0 },
      },
      limit: {
        context: 128000,
        output: 4096,
      },
      status: "active",
      options: {},
      headers: {},
      release_date: "2026-01-01",
    },
  },
}

describe("ACP next service sessions", () => {
  const makeService = (messages: readonly { info: unknown; parts: readonly unknown[] }[] = []) => {
    const updates: unknown[] = []
    const mcpAdds: string[] = []
    const sdk = {
      config: {
        providers: () => Promise.resolve({ data: { providers: [provider], default: { test: modelID } } }),
        get: () => Promise.resolve({ data: {} }),
      },
      app: {
        agents: () =>
          Promise.resolve({
            data: [
              { name: "build", mode: "primary", permission: [], options: {} },
              { name: "plan", mode: "primary", description: "Plan first", permission: [], options: {} },
              { name: "hidden", mode: "primary", hidden: true, permission: [], options: {} },
            ],
          }),
        skills: () =>
          Promise.resolve({
            data: [{ name: "review-skill", description: "Review", location: "/skills/review", content: "review" }],
          }),
      },
      command: {
        list: () =>
          Promise.resolve({
            data: [{ name: "init", description: "Initialize", source: "command", template: "init", hints: [] }],
          }),
      },
      session: {
        create: () => Promise.resolve({ data: { id: "ses_new" } }),
        get: () => Promise.resolve({ data: { id: "ses_loaded" } }),
        list: () => Promise.resolve({ data: [] }),
        messages: () => Promise.resolve({ data: messages }),
      },
      mcp: {
        add: (input: { name?: string }) => {
          if (input.name) mcpAdds.push(input.name)
          return Promise.resolve({ data: {} })
        },
      },
    } as unknown as OpencodeClient
    const connection = {
      sessionUpdate: (update: unknown) => {
        updates.push(update)
        return Promise.resolve()
      },
    } as Pick<AgentSideConnection, "sessionUpdate">

    return { service: ACPNextService.make({ sdk, connection }), updates, mcpAdds }
  }

  it("creates a backed session with config options and command update", async () => {
    const { service, updates, mcpAdds } = makeService()
    const result = await Effect.runPromise(
      service.newSession({
        cwd: "/workspace",
        mcpServers: [
          { name: "tools", command: "node", args: ["server.js"], env: [] },
          { name: "tools", command: "node", args: ["server.js"], env: [] },
        ],
      }),
    )

    await new Promise((resolve) => setTimeout(resolve, 5))

    expect(result.sessionId).toBe("ses_new")
    expect(categories(result)).toContain("model")
    expect(categories(result)).toContain("thought_level")
    expect(categories(result)).toContain("mode")
    expect(updates).toHaveLength(1)
    expect(JSON.stringify(updates[0])).toContain("available_commands_update")
    expect(JSON.stringify(updates[0])).toContain("review-skill")
    expect(mcpAdds).toEqual(["tools"])
  })

  it("loads a session and restores model variant and mode from messages", async () => {
    const { service } = makeService([
      {
        info: {
          role: "assistant",
          providerID: "test",
          modelID: "test-model",
          variant: "high",
          mode: "plan",
        },
        parts: [],
      },
    ])
    const result = await Effect.runPromise(
      service.loadSession({ cwd: "/workspace", sessionId: "ses_loaded", mcpServers: [] }),
    )

    expect(result.configOptions?.find((option) => option.id === "effort")?.currentValue).toBe("high")
    expect(result.configOptions?.find((option) => option.id === "mode")?.currentValue).toBe("plan")
  })

  it("restores model variant and mode from the latest user message", async () => {
    const { service } = makeService([
      {
        info: {
          role: "user",
          model: { providerID: "test", modelID: "test-model", variant: "default" },
          agent: "build",
        },
        parts: [],
      },
      {
        info: {
          role: "user",
          model: { providerID: "test", modelID: "test-model", variant: "high" },
          agent: "plan",
        },
        parts: [],
      },
    ])
    const result = await Effect.runPromise(
      service.loadSession({ cwd: "/workspace", sessionId: "ses_loaded", mcpServers: [] }),
    )

    expect(result.configOptions?.find((option) => option.id === "effort")?.currentValue).toBe("high")
    expect(result.configOptions?.find((option) => option.id === "mode")?.currentValue).toBe("plan")
  })


  it("maps provider auth failures to auth-required request errors", async () => {
    const service = ACPNextService.make({
      sdk: {
        config: {
          providers: () => Promise.reject({ name: "ProviderAuthError", data: { providerID: "test" } }),
          get: () => Promise.resolve({ data: {} }),
        },
        app: {
          agents: () => Promise.resolve({ data: [] }),
          skills: () => Promise.resolve({ data: [] }),
        },
        command: {
          list: () => Promise.resolve({ data: [] }),
        },
      } as unknown as OpencodeClient,
    })
    const error = await Effect.runPromise(
      service
        .newSession({ cwd: "/workspace", mcpServers: [] })
        .pipe(Effect.mapError(ACPNextError.toRequestError), Effect.flip),
    )

    expect(error.code).toBe(-32000)
  })

  it("does not cache failed directory snapshots", async () => {
    let providersCalls = 0
    const sdk = {
        config: {
          providers: () => {
          providersCalls++
          if (providersCalls === 1) {
            return Promise.reject({ name: "ProviderAuthError", data: { providerID: "test" } })
          }
          return Promise.resolve({ data: { providers: [provider], default: { test: modelID } } })
          },
          get: () => Promise.resolve({ data: {} }),
      },
      app: {
        agents: () => Promise.resolve({ data: [{ name: "build", mode: "primary", permission: [], options: {} }] }),
        skills: () => Promise.resolve({ data: [] }),
      },
      command: {
        list: () => Promise.resolve({ data: [] }),
      },
      session: {
        create: () => Promise.resolve({ data: { id: "ses_retry" } }),
        list: () => Promise.resolve({ data: [] }),
      },
      mcp: {
        add: () => Promise.resolve({ data: {} }),
      },
    } as unknown as OpencodeClient
    const service = ACPNextService.make({ sdk })

    const first = await Effect.runPromise(
      service
        .newSession({ cwd: "/workspace", mcpServers: [] })
        .pipe(Effect.mapError(ACPNextError.toRequestError), Effect.flip),
    )
    const second = await Effect.runPromise(service.newSession({ cwd: "/workspace", mcpServers: [] }))

    expect(first.code).toBe(-32000)
    expect(second.sessionId).toBe("ses_retry")
    expect(providersCalls).toBe(2)
  })

  it("uses the configured model as the new session default", async () => {
    const sdk = {
      config: {
        providers: () => Promise.resolve({ data: { providers: [provider], default: { test: modelID } } }),
        get: () => Promise.resolve({ data: { model: "test/configured-model" } }),
      },
      app: {
        agents: () => Promise.resolve({ data: [{ name: "build", mode: "primary", permission: [], options: {} }] }),
        skills: () => Promise.resolve({ data: [] }),
      },
      command: {
        list: () => Promise.resolve({ data: [] }),
      },
      session: {
        create: (input: { model?: { id?: string } }) => Promise.resolve({ data: { id: input.model?.id } }),
        list: () => Promise.resolve({ data: [] }),
      },
      mcp: {
        add: () => Promise.resolve({ data: {} }),
      },
    } as unknown as OpencodeClient
    const service = ACPNextService.make({ sdk })

    const result = await Effect.runPromise(service.newSession({ cwd: "/workspace", mcpServers: [] }))

    expect(result.sessionId).toBe("configured-model")
    expect(result.configOptions?.find((option) => option.id === "model")?.currentValue).toBe("test/configured-model")
  })
})

function categories(result: NewSessionResponse | LoadSessionResponse) {
  return result.configOptions?.map((option) => option.category) ?? []
}