import { describe, expect, test } from "bun:test"
import path from "path"
import { Effect, Layer } from "effect"
import { Session } from "../../src/session"
import { SessionPrompt } from "../../src/session/prompt"
import { Log } from "../../src/util/log"
import { Instance } from "../../src/project/instance"
import { MessageV2 } from "../../src/session/message-v2"

const projectRoot = path.join(__dirname, "../..")
Log.init({ print: false })

// Skip tests if no API key is available
const hasApiKey = !!process.env.ANTHROPIC_API_KEY

// Helper to run test within Instance context
async function withInstance<T>(fn: () => Promise<T>): Promise<T> {
  return Instance.provide({
    directory: projectRoot,
    fn,
  })
}

function run<A, E>(fx: Effect.Effect<A, E, SessionPrompt.Service | Session.Service>) {
  return Effect.runPromise(
    fx.pipe(Effect.scoped, Effect.provide(Layer.mergeAll(SessionPrompt.defaultLayer, Session.defaultLayer))),
  )
}

describe("StructuredOutput Integration", () => {
  test.skipIf(!hasApiKey)(
    "produces structured output with simple schema",
    async () => {
      await withInstance(() =>
        run(
          Effect.gen(function* () {
            const prompt = yield* SessionPrompt.Service
            const sessions = yield* Session.Service
            const session = yield* sessions.create({ title: "Structured Output Test" })

            const result = yield* prompt.prompt({
              sessionID: session.id,
              parts: [
                {
                  type: "text",
                  text: "What is 2 + 2? Provide a simple answer.",
                },
              ],
              format: {
                type: "json_schema",
                schema: {
                  type: "object",
                  properties: {
                    answer: { type: "number", description: "The numerical answer" },
                    explanation: { type: "string", description: "Brief explanation" },
                  },
                  required: ["answer"],
                },
                retryCount: 0,
              },
            })

            // Verify structured output was captured (only on assistant messages)
            expect(result.info.role).toBe("assistant")
            if (result.info.role === "assistant") {
              expect(result.info.structured).toBeDefined()
              expect(typeof result.info.structured).toBe("object")

              const output = result.info.structured as any
              expect(output.answer).toBe(4)

              // Verify no error was set
              expect(result.info.error).toBeUndefined()
            }

            // Clean up
            // Note: Not removing session to avoid race with background SessionSummary.summarize
          }),
        ),
      )
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "produces structured output with nested objects",
    async () => {
      await withInstance(() =>
        run(
          Effect.gen(function* () {
            const prompt = yield* SessionPrompt.Service
            const sessions = yield* Session.Service
            const session = yield* sessions.create({ title: "Nested Schema Test" })

            const result = yield* prompt.prompt({
              sessionID: session.id,
              parts: [
                {
                  type: "text",
                  text: "Tell me about Anthropic company in a structured format.",
                },
              ],
              format: {
                type: "json_schema",
                schema: {
                  type: "object",
                  properties: {
                    company: {
                      type: "object",
                      properties: {
                        name: { type: "string" },
                        founded: { type: "number" },
                      },
                      required: ["name", "founded"],
                    },
                    products: {
                      type: "array",
                      items: { type: "string" },
                    },
                  },
                  required: ["company"],
                },
                retryCount: 0,
              },
            })

            // Verify structured output was captured (only on assistant messages)
            expect(result.info.role).toBe("assistant")
            if (result.info.role === "assistant") {
              expect(result.info.structured).toBeDefined()
              const output = result.info.structured as any

              expect(output.company).toBeDefined()
              expect(output.company.name).toBe("Anthropic")
              expect(typeof output.company.founded).toBe("number")

              if (output.products) {
                expect(Array.isArray(output.products)).toBe(true)
              }

              // Verify no error was set
              expect(result.info.error).toBeUndefined()
            }

            // Clean up
            // Note: Not removing session to avoid race with background SessionSummary.summarize
          }),
        ),
      )
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "works with text outputFormat (default)",
    async () => {
      await withInstance(() =>
        run(
          Effect.gen(function* () {
            const prompt = yield* SessionPrompt.Service
            const sessions = yield* Session.Service
            const session = yield* sessions.create({ title: "Text Output Test" })

            const result = yield* prompt.prompt({
              sessionID: session.id,
              parts: [
                {
                  type: "text",
                  text: "Say hello.",
                },
              ],
              format: {
                type: "text",
              },
            })

            // Verify no structured output (text mode) and no error
            expect(result.info.role).toBe("assistant")
            if (result.info.role === "assistant") {
              expect(result.info.structured).toBeUndefined()
              expect(result.info.error).toBeUndefined()
            }

            // Verify we got a response with parts
            expect(result.parts.length).toBeGreaterThan(0)

            // Clean up
            // Note: Not removing session to avoid race with background SessionSummary.summarize
          }),
        ),
      )
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "stores outputFormat on user message",
    async () => {
      await withInstance(() =>
        run(
          Effect.gen(function* () {
            const prompt = yield* SessionPrompt.Service
            const sessions = yield* Session.Service
            const session = yield* sessions.create({ title: "OutputFormat Storage Test" })

            yield* prompt.prompt({
              sessionID: session.id,
              parts: [
                {
                  type: "text",
                  text: "What is 1 + 1?",
                },
              ],
              format: {
                type: "json_schema",
                schema: {
                  type: "object",
                  properties: {
                    result: { type: "number" },
                  },
                  required: ["result"],
                },
                retryCount: 3,
              },
            })

            // Get all messages from session
            const messages = yield* sessions.messages({ sessionID: session.id })
            const userMessage = messages.find((m) => m.info.role === "user")

            // Verify outputFormat was stored on user message
            expect(userMessage).toBeDefined()
            if (userMessage?.info.role === "user") {
              expect(userMessage.info.format).toBeDefined()
              expect(userMessage.info.format?.type).toBe("json_schema")
              if (userMessage.info.format?.type === "json_schema") {
                expect(userMessage.info.format.retryCount).toBe(3)
              }
            }

            // Clean up
            // Note: Not removing session to avoid race with background SessionSummary.summarize
          }),
        ),
      )
    },
    60000,
  )

  test("unit test: StructuredOutputError is properly structured", () => {
    const error = new MessageV2.StructuredOutputError({
      message: "Failed to produce valid structured output after 3 attempts",
      retries: 3,
    })

    expect(error.name).toBe("StructuredOutputError")
    expect(error.data.message).toContain("3 attempts")
    expect(error.data.retries).toBe(3)

    const obj = error.toObject()
    expect(obj.name).toBe("StructuredOutputError")
    expect(obj.data.retries).toBe(3)
  })
})
