import { describe, it, expect, spyOn, beforeEach, afterEach } from "bun:test"
import * as spawnWithWindowsHideModule from "../../shared/spawn-with-windows-hide"
import * as loggerModule from "../../shared/logger"
import { executeOnCompleteHook } from "./on-complete-hook"

describe("executeOnCompleteHook", () => {
  let originalPlatform: NodeJS.Platform
  let originalEnv: Record<string, string | undefined>

  function createStream(text: string): ReadableStream<Uint8Array> | undefined {
    if (text.length === 0) {
      return undefined
    }

    const encoder = new TextEncoder()
    return new ReadableStream<Uint8Array>({
      start(controller) {
        controller.enqueue(encoder.encode(text))
        controller.close()
      },
    })
  }

  function createProc(exitCode: number, output?: { stdout?: string; stderr?: string }) {
    return {
      exited: Promise.resolve(exitCode),
      exitCode,
      stdout: createStream(output?.stdout ?? ""),
      stderr: createStream(output?.stderr ?? ""),
      kill: () => {},
    } satisfies ReturnType<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>
  }

  let logSpy: ReturnType<typeof spyOn<typeof loggerModule, "log">>

  beforeEach(() => {
    originalPlatform = process.platform
    originalEnv = {
      SHELL: process.env.SHELL,
      PSModulePath: process.env.PSModulePath,
      ComSpec: process.env.ComSpec,
    }
    logSpy = spyOn(loggerModule, "log").mockImplementation(() => {})
  })

  afterEach(() => {
    Object.defineProperty(process, "platform", { value: originalPlatform })
    for (const [key, value] of Object.entries(originalEnv)) {
      if (value !== undefined) {
        process.env[key] = value
      } else {
        delete process.env[key]
      }
    }
    logSpy.mockRestore()
  })

  it("uses sh on unix shells and passes correct env vars", async () => {
    // given
    Object.defineProperty(process, "platform", { value: "linux" })
    process.env.SHELL = "/bin/bash"
    delete process.env.PSModulePath
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "echo test",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      expect(spawnSpy).toHaveBeenCalledTimes(1)
      const [args, options] = spawnSpy.mock.calls[0] as Parameters<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>

      expect(args).toEqual(["sh", "-c", "echo test"])
      expect(options?.env?.SESSION_ID).toBe("session-123")
      expect(options?.env?.EXIT_CODE).toBe("0")
      expect(options?.env?.DURATION_MS).toBe("5000")
      expect(options?.env?.MESSAGE_COUNT).toBe("10")
      expect(options?.stdout).toBe("pipe")
      expect(options?.stderr).toBe("pipe")
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("uses powershell when PowerShell is detected on Windows", async () => {
    // given
    Object.defineProperty(process, "platform", { value: "win32" })
    process.env.PSModulePath = "C:\\Program Files\\PowerShell\\Modules"
    delete process.env.SHELL
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "Write-Host done",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      const [args] = spawnSpy.mock.calls[0] as Parameters<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>
      expect(args).toEqual(["powershell.exe", "-NoProfile", "-Command", "Write-Host done"])
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("uses pwsh when PowerShell is detected on non-Windows platforms", async () => {
    // given
    Object.defineProperty(process, "platform", { value: "linux" })
    process.env.PSModulePath = "/usr/local/share/powershell/Modules"
    delete process.env.SHELL
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "Write-Host done",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      const [args] = spawnSpy.mock.calls[0] as Parameters<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>
      expect(args).toEqual(["pwsh", "-NoProfile", "-Command", "Write-Host done"])
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("falls back to cmd.exe on Windows when PowerShell is not detected", async () => {
    // given
    Object.defineProperty(process, "platform", { value: "win32" })
    delete process.env.PSModulePath
    delete process.env.SHELL
    process.env.ComSpec = "C:\\Windows\\System32\\cmd.exe"
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "echo done",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      const [args] = spawnSpy.mock.calls[0] as Parameters<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>
      expect(args).toEqual(["C:\\Windows\\System32\\cmd.exe", "/d", "/s", "/c", "echo done"])
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("env var values are strings", async () => {
    // given
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "echo test",
        sessionId: "session-123",
        exitCode: 1,
        durationMs: 12345,
        messageCount: 42,
      })

      // then
      const [_, options] = spawnSpy.mock.calls[0] as Parameters<typeof spawnWithWindowsHideModule.spawnWithWindowsHide>

      expect(options?.env?.EXIT_CODE).toBe("1")
      expect(options?.env?.EXIT_CODE).toBeTypeOf("string")
      expect(options?.env?.DURATION_MS).toBe("12345")
      expect(options?.env?.DURATION_MS).toBeTypeOf("string")
      expect(options?.env?.MESSAGE_COUNT).toBe("42")
      expect(options?.env?.MESSAGE_COUNT).toBeTypeOf("string")
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("empty command string is no-op", async () => {
    // given
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      expect(spawnSpy).not.toHaveBeenCalled()
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("whitespace-only command is no-op", async () => {
    // given
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(0))

    try {
      // when
      await executeOnCompleteHook({
        command: "   ",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      expect(spawnSpy).not.toHaveBeenCalled()
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("command failure logs warning but does not throw", async () => {
    // given
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(createProc(1))

    try {
      // when
      expect(
        executeOnCompleteHook({
          command: "false",
          sessionId: "session-123",
          exitCode: 0,
          durationMs: 5000,
          messageCount: 10,
        })
      ).resolves.toBeUndefined()

      // then
      const warningCall = logSpy.mock.calls.find(
        (call) => call[0] === "On-complete hook exited with non-zero code"
      )
      expect(warningCall).toBeDefined()
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("spawn error logs warning but does not throw", async () => {
    // given
    const spawnError = new Error("Command not found")
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockImplementation(() => {
      throw spawnError
    })

    try {
      // when
      expect(
        executeOnCompleteHook({
          command: "nonexistent-command",
          sessionId: "session-123",
          exitCode: 0,
          durationMs: 5000,
          messageCount: 10,
        })
      ).resolves.toBeUndefined()

      // then
      const errorCall = logSpy.mock.calls.find(
        (call) => call[0] === "Failed to execute on-complete hook"
      )
      expect(errorCall).toBeDefined()
    } finally {
      spawnSpy.mockRestore()
    }
  })

  it("hook stdout and stderr are logged to file logger", async () => {
    // given
    const spawnSpy = spyOn(spawnWithWindowsHideModule, "spawnWithWindowsHide").mockReturnValue(
      createProc(0, { stdout: "hook output\n", stderr: "hook warning\n" })
    )

    try {
      // when
      await executeOnCompleteHook({
        command: "echo test",
        sessionId: "session-123",
        exitCode: 0,
        durationMs: 5000,
        messageCount: 10,
      })

      // then
      const stdoutCall = logSpy.mock.calls.find(
        (call) => call[0] === "On-complete hook stdout"
      )
      const stderrCall = logSpy.mock.calls.find(
        (call) => call[0] === "On-complete hook stderr"
      )

      expect(stdoutCall?.[1]).toEqual({ command: "echo test", stdout: "hook output" })
      expect(stderrCall?.[1]).toEqual({ command: "echo test", stderr: "hook warning" })
    } finally {
      spawnSpy.mockRestore()
    }
  })
})