import test from 'node:test'
import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import {
	COMPLETION_PHASE,
	completionPresentation,
	observeLoadingCompletion,
	refreshCompletionAttempt,
	resolveCompletionPhase,
	shouldReconcileCompletion
} from '../utils/loading-completion-state.js'

test('accepted completion queries immediately and returns as soon as the real task completes', async () => {
	const reads = [], waits = [], applied = []
	let clock = 0
	const result = await observeLoadingCompletion({
		initialTask: { taskStatus: 'COMPLETING' },
		readTask: async () => {
			reads.push(clock)
			return { taskStatus: reads.length === 1 ? 'COMPLETING' : 'COMPLETED' }
		},
		isActive: () => true, onTask: task => applied.push(task.taskStatus), now: () => clock,
		wait: async delay => { waits.push(delay); clock += delay }
	})
	assert.deepEqual(reads, [0, 250])
	assert.deepEqual(waits, [250])
	assert.deepEqual(applied, ['COMPLETING', 'COMPLETED'])
	assert.equal(result.taskStatus, 'COMPLETED')
})

test('completion observation preserves failure, pending and unknown results without inventing success', async () => {
	for (const status of ['COMPLETION_FAILED', 'LOADING']) {
		const result = await observeLoadingCompletion({ initialTask: { taskStatus: 'COMPLETING' },
			readTask: async () => ({ taskStatus: status }), isActive: () => true, onTask() {},
			wait: async () => assert.fail('terminal or unknown facts must stop polling') })
		assert.equal(result.taskStatus, status)
	}
	let clock = 0, reads = 0
	const pending = await observeLoadingCompletion({ initialTask: { taskStatus: 'COMPLETING' },
		readTask: async () => { reads++; return { taskStatus: 'COMPLETING' } },
		isActive: () => true, onTask() {}, now: () => clock, maxWaitMs: 500,
		wait: async delay => { clock += delay } })
	assert.equal(pending.taskStatus, 'COMPLETING')
	assert.equal(reads, 2)
})

test('hidden or switched tasks stop completion observation and discard in-flight responses', async () => {
	let active = true, applied = 0
	const result = await observeLoadingCompletion({ initialTask: { taskStatus: 'COMPLETING' },
		readTask: async () => { active = false; return { taskStatus: 'COMPLETED' } },
		isActive: () => active, onTask: () => { applied++ } })
	assert.equal(result, null)
	assert.equal(applied, 0)
	await observeLoadingCompletion({ initialTask: { taskStatus: 'COMPLETING' },
		readTask: async () => assert.fail('hidden task must not query'), isActive: () => false, onTask() {} })
})

test('query failure is not retried as a completion mutation and completed acceptance needs no query', async () => {
	await assert.rejects(observeLoadingCompletion({ initialTask: { taskStatus: 'COMPLETING' },
		readTask: async () => { throw new Error('network unavailable') }, isActive: () => true, onTask() {} }), /network/)
	const completed = { taskStatus: 'COMPLETED' }
	assert.equal(await observeLoadingCompletion({ initialTask: completed,
		readTask: async () => assert.fail('no query after authoritative completion'), isActive: () => true, onTask() {} }), completed)
})

test('page only announces success and clears the original attempt after authoritative completion', async () => {
	const page = await readFile(new URL('../pages/picking/picking.vue', import.meta.url), 'utf8')
	const method = page.match(/async completeLoadingTask\(\) \{[\s\S]*?\n\t\t\t\},/)?.[0]
	assert.ok(method)
	for (const status of ['COMPLETED', 'COMPLETION_FAILED', 'COMPLETING', 'LOADING', 'QUERY_ERROR', 'NO_RESPONSE']) {
		const messages = [], cleared = [], saved = []
		const bindings = {
			COMPLETION_PHASE, resolveCompletionPhase, shouldReconcileCompletion,
			isRemoteReady: () => true, restoreLoadingCompletionAttempt: () => null,
			stableTaskOperationIdentity: () => 'stable-task', stableOperationId: () => 'original-operation',
			saveLoadingCompletionAttempt: (_, attempt) => saved.push(attempt),
			clearLoadingCompletionAttempt: identity => cleared.push(identity),
			completeContainerPickingTask: async () => status === 'NO_RESPONSE' ? null : { taskStatus: 'COMPLETING', version: 2 },
			normalizePickingTask: task => task,
			observeLoadingCompletion: async options => {
				assert.notEqual(status, 'NO_RESPONSE')
				assert.equal(options.isActive(), true)
				if (status === 'QUERY_ERROR') throw new Error('network error after acceptance')
				const task = { taskStatus: status, version: 3 }
				options.onTask(task)
				return task
			}
		}
		const behavior = new Function(...Object.keys(bindings), `return ({${method}})`)(...Object.values(bindings))
		const context = {
			requireEvidenceStage: () => true, evidenceIdentity: { taskId: 'task', warehouseId: 'warehouse' },
			pickingVersion: 1, evidenceComplete: true, evidenceContextId: 1, remoteTaskId: 'task', remotePick: {},
			draftIdentity: () => ({ loadingPlanId: 'plan', containerBookingId: 'cabinet' }),
			isEvidenceContextActive: () => true, _pageVisible: true, debugSubmit() {}, persistSession() {},
			showToast: (message, type) => messages.push({ message, type })
		}
		await behavior.completeLoadingTask.call(context)
		assert.equal(context.submitting, false)
		assert.equal(saved.length, 1)
		assert.equal(saved[0].operationId, 'original-operation')
		assert.equal(saved[0].expectedTaskVersion, 1)
		assert.equal(cleared.length, status === 'COMPLETED' ? 1 : 0)
		assert.equal(messages.some(message => message.message === '装柜已完成'), status === 'COMPLETED')
		if (status !== 'COMPLETED') assert.ok(context.remoteError)
	}
})

test('reopened processing and completed tasks keep evidence and completion read-only', async () => {
	const page = await readFile(new URL('../pages/picking/picking.vue', import.meta.url), 'utf8')
	const methods = ['loadingCompletionState', 'evidenceReadOnly', 'requireEvidenceStage'].map(name => {
		const method = page.match(new RegExp(`${name}\\(\\) \\{[\\s\\S]*?\\n\\t\\t\\t\\},`))?.[0]
		assert.ok(method, name)
		return method
	})
	const behavior = new Function('resolveCompletionPhase', 'completionPresentation', `return ({${methods.join('\n')}})`)(resolveCompletionPhase, completionPresentation)
	for (const workflowStatus of ['PROCESSING', 'COMPLETED']) {
		const messages = []
		const context = { remotePick: { workflowStatus, completionCommand: { status: workflowStatus } }, submitting: false, pickingCompleted: true, loadingStageReady: true, showToast(message) { messages.push(message) } }
		context.loadingCompletionState = behavior.loadingCompletionState.call(context)
		context.evidenceReadOnly = behavior.evidenceReadOnly.call(context)
		assert.equal(context.evidenceReadOnly, true)
		assert.equal(behavior.requireEvidenceStage.call(context), false)
		assert.deepEqual(messages, [workflowStatus === 'COMPLETED' ? '装柜已完成' : '完成处理中'])
	}
	const retry = { remotePick: { workflowStatus: 'COMPLETION_FAILED' }, submitting: false }
	retry.loadingCompletionState = behavior.loadingCompletionState.call(retry)
	assert.equal(behavior.evidenceReadOnly.call(retry), false)
	assert.match(page, /v-if="evidenceReadOnly"[^>]*role="status"/)
	assert.match(page, /v-else class="loading-complete-btn"/)
	assert.match(page, /class="evidence-btn evidence-add-btn" :disabled="evidenceReadOnly"/)
})

test('accepted completion is processing and blocks every repeated mutation', () => {
	for (const facts of [
		{ taskStatus: 'COMPLETING' },
		{ commandStatus: 'PROCESSING' },
		{ taskStatus: 'COMPLETING', commandStatus: 'PROCESSING' }
	]) {
		const phase = resolveCompletionPhase(facts)
		assert.equal(phase, COMPLETION_PHASE.PROCESSING)
		assert.deepEqual(completionPresentation(phase), { label: '完成处理中', action: '', blocked: true })
	}
})

test('submission and uncertain-result reconciliation block duplicate completion immediately', () => {
	assert.equal(resolveCompletionPhase({ submitting: true }), COMPLETION_PHASE.SUBMITTING)
	assert.equal(resolveCompletionPhase({ reconciling: true }), COMPLETION_PHASE.RECONCILING)
	assert.equal(completionPresentation(COMPLETION_PHASE.SUBMITTING).blocked, true)
	assert.equal(completionPresentation(COMPLETION_PHASE.RECONCILING).blocked, true)
})

test('completion failure exposes a readable stage and retry entry', () => {
	const phase = resolveCompletionPhase({ taskStatus: 'COMPLETION_FAILED' })
	assert.equal(phase, COMPLETION_PHASE.FAILED)
	assert.deepEqual(completionPresentation(phase, '费用结算'), {
		label: '完成失败：费用结算', action: '重试完成', blocked: true, retryable: true
	})
})

test('retry reuses the original operation id and request-hashed task version', () => {
	const attempt = refreshCompletionAttempt(
		{ operationId: 'complete-task-8-v3', expectedTaskVersion: 3, commandId: 'cmd-old' },
		{ taskVersion: 7, commandId: 'cmd-latest', commandStatus: 'COMPLETION_FAILED' }
	)
	assert.equal(attempt.operationId, 'complete-task-8-v3')
	assert.equal(attempt.expectedTaskVersion, 3)
	assert.equal(attempt.commandId, 'cmd-latest')
	assert.throws(() => refreshCompletionAttempt({}, { taskVersion: 7 }), /缺少原完成操作标识/)
	assert.throws(() => refreshCompletionAttempt({ operationId: 'stable-id' }), /缺少服务端最新任务版本/)
})

test('network and timeout failures reconcile before any retry while business conflicts stay intact', () => {
	assert.equal(shouldReconcileCompletion({ network: true }), true)
	assert.equal(shouldReconcileCompletion({ timeout: true }), true)
	assert.equal(shouldReconcileCompletion({ code: 'REQUEST_TIMEOUT' }), true)
	assert.equal(shouldReconcileCompletion({ code: 'A0409', apiErrorMeta: { requestId: 'req-1' } }), false)
})

test('completed facts win over stale processing facts', () => {
	const phase = resolveCompletionPhase({ taskStatus: 'COMPLETED', commandStatus: 'PROCESSING' })
	assert.equal(phase, COMPLETION_PHASE.COMPLETED)
	assert.equal(completionPresentation(phase).label, '装柜已完成')
})