import { describe, test, expect, mock, beforeEach } from "bun:test"
import { executeCompact } from "./executor"
import type { AutoCompactState } from "./types"

describe("executeCompact lock management", () => {
  let autoCompactState: AutoCompactState
  let mockClient: any
  const sessionID = "test-session-123"
  const directory = "/test/dir"
  const msg = { providerID: "anthropic", modelID: "claude-opus-4-5" }

  beforeEach(() => {
    // #given: Fresh state for each test
    autoCompactState = {
      pendingCompact: new Set<string>(),
      errorDataBySession: new Map(),
      retryStateBySession: new Map(),
      fallbackStateBySession: new Map(),
      truncateStateBySession: new Map(),
      dcpStateBySession: new Map(),
      emptyContentAttemptBySession: new Map(),
      compactionInProgress: new Set<string>(),
    }

    mockClient = {
      session: {
        messages: mock(() => Promise.resolve({ data: [] })),
        summarize: mock(() => Promise.resolve()),
        revert: mock(() => Promise.resolve()),
        prompt_async: mock(() => Promise.resolve()),
      },
      tui: {
        showToast: mock(() => Promise.resolve()),
      },
    }
  })

  test("clears lock on successful summarize completion", async () => {
    // #given: Valid session with providerID/modelID
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction successfully
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Lock should be cleared
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("clears lock when summarize throws exception", async () => {
    // #given: Summarize will fail
    mockClient.session.summarize = mock(() =>
      Promise.reject(new Error("Network timeout")),
    )
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Lock should still be cleared despite exception
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("clears lock when revert throws exception", async () => {
    // #given: Force revert path by exhausting retry attempts and making revert fail
    mockClient.session.revert = mock(() =>
      Promise.reject(new Error("Revert failed")),
    )
    mockClient.session.messages = mock(() =>
      Promise.resolve({
        data: [
          { info: { id: "msg1", role: "user" } },
          { info: { id: "msg2", role: "assistant" } },
        ],
      }),
    )

    // Exhaust retry attempts
    autoCompactState.retryStateBySession.set(sessionID, {
      attempt: 5,
      lastAttemptTime: Date.now(),
    })
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Lock cleared even though revert failed
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("shows toast when lock already held", async () => {
    // #given: Lock already held
    autoCompactState.compactionInProgress.add(sessionID)

    // #when: Try to execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Toast should be shown with warning message
    expect(mockClient.tui.showToast).toHaveBeenCalledWith(
      expect.objectContaining({
        body: expect.objectContaining({
          title: "Compact In Progress",
          message: expect.stringContaining("Recovery already running"),
          variant: "warning",
        }),
      }),
    )

    // #then: compactionInProgress should still have the lock
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(true)
  })

  test("clears lock when fixEmptyMessages path executes", async () => {
    // #given: Empty content error scenario
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "non-empty content required",
      messageIndex: 0,
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction (fixEmptyMessages will be called)
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Lock should be cleared
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("clears lock when truncation is sufficient", async () => {
    // #given: Aggressive truncation scenario with sufficient truncation
    // This test verifies the early return path in aggressive truncation
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 250000,
      maxTokens: 200000,
    })

    const experimental = {
      truncate_all_tool_outputs: false,
      aggressive_truncation: true,
    }
    const dcpForCompaction = true

    // #when: Execute compaction with experimental flag
    await executeCompact(
      sessionID,
      msg,
      autoCompactState,
      mockClient,
      directory,
      experimental,
      dcpForCompaction,
    )

    // #then: Lock should be cleared even on early return
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("prevents concurrent compaction attempts", async () => {
    // #given: Lock already held (simpler test)
    autoCompactState.compactionInProgress.add(sessionID)

    // #when: Try to execute compaction while lock is held
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Toast should be shown
    const toastCalls = (mockClient.tui.showToast as any).mock.calls
    const blockedToast = toastCalls.find(
      (call: any) => call[0]?.body?.title === "Compact In Progress",
    )
    expect(blockedToast).toBeDefined()

    // #then: Lock should still be held (not cleared by blocked attempt)
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(true)
  })

  test("clears lock after max recovery attempts exhausted", async () => {
    // #given: All retry/revert attempts exhausted
    mockClient.session.messages = mock(() => Promise.resolve({ data: [] }))

    // Max out all attempts
    autoCompactState.retryStateBySession.set(sessionID, {
      attempt: 5,
      lastAttemptTime: Date.now(),
    })
    autoCompactState.fallbackStateBySession.set(sessionID, {
      revertAttempt: 5,
    })
    autoCompactState.truncateStateBySession.set(sessionID, {
      truncateAttempt: 5,
    })
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Should show failure toast
    const toastCalls = (mockClient.tui.showToast as any).mock.calls
    const failureToast = toastCalls.find(
      (call: any) => call[0]?.body?.title === "Auto Compact Failed",
    )
    expect(failureToast).toBeDefined()

    // #then: Lock should still be cleared
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("clears lock when client.tui.showToast throws", async () => {
    // #given: Toast will fail (this should never happen but testing robustness)
    mockClient.tui.showToast = mock(() =>
      Promise.reject(new Error("Toast failed")),
    )
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // #then: Lock should be cleared even if toast fails
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })

  test("clears lock when prompt_async in continuation throws", async () => {
    // #given: prompt_async will fail during continuation
    mockClient.session.prompt_async = mock(() =>
      Promise.reject(new Error("Prompt failed")),
    )
    autoCompactState.errorDataBySession.set(sessionID, {
      errorType: "token_limit",
      currentTokens: 100000,
      maxTokens: 200000,
    })

    // #when: Execute compaction
    await executeCompact(sessionID, msg, autoCompactState, mockClient, directory)

    // Wait for setTimeout callback
    await new Promise((resolve) => setTimeout(resolve, 600))

    // #then: Lock should be cleared
    // The continuation happens in setTimeout, but lock is cleared in finally before that
    expect(autoCompactState.compactionInProgress.has(sessionID)).toBe(false)
  })
})