/**
 * @license
 * Copyright 2025 Vybestack LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { describe, it, expect, vi } from 'vitest';
import * as fc from 'fast-check';
import { createCompletionHandler, tokenize } from './index.js';
import { createMockCommandContext } from '../../../test-utils/mockCommandContext.js';
import { DebugLogger } from '@vybestack/llxprt-code-core';
// Mock command context for tests
const mockContext = createMockCommandContext();
// Helper functions to create test arguments
const literal = (value, description, next) => ({
    kind: 'literal',
    value,
    description: description || `Literal ${value}`,
    next,
});
const value = (name, description, options, completer, hint, next) => ({
    kind: 'value',
    name,
    description,
    options: (options || []).map((opt) => typeof opt === 'string' ? { value: opt } : opt),
    completer,
    hint,
    next,
});
describe('argumentResolver @plan:PLAN-20251013-AUTOCOMPLETE.P04', () => {
    describe('Basic functionality', () => {
        it('handles empty input gracefully @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [value('arg1', 'First argument')];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/');
            expect(result).toHaveProperty('suggestions');
            expect(result).toHaveProperty('hint');
            expect(Array.isArray(result.suggestions)).toBe(true);
            expect(result.position).toBe(1);
        });
        it('provides hints for value arguments @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                value('username', 'User name', undefined, undefined, async () => 'Enter a valid username'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/username');
            expect(result.hint).toBe('Enter a valid username');
            expect(result.position).toBe(1);
        });
        it('returns literal descriptions as hints when literal nodes are active @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                literal('create', 'Create a resource'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/subagent ');
            expect(result.hint).toBe('Create a resource');
            expect(result.suggestions).toEqual([
                expect.objectContaining({ value: 'create' }),
            ]);
            expect(result.position).toBe(1);
        });
        it('filters literal suggestions based on partial input @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                literal('create', 'Create a resource'),
                literal('delete', 'Delete a resource'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/subagent cr');
            expect(result.suggestions).toEqual([
                expect.objectContaining({ value: 'create' }),
            ]);
        });
        it('omits literal suggestions when partial does not match @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                literal('create', 'Create a resource'),
                literal('delete', 'Delete a resource'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/subagent zz');
            expect(result.suggestions).toEqual([]);
        });
        it('prefers string hints on value arguments over descriptions @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-004', async () => {
            const schema = [
                value('mode', '', ['manual', 'auto'], undefined, 'Select mode'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command ');
            expect(result.hint).toBe('Select mode');
            expect(result.suggestions).toEqual(expect.arrayContaining([
                expect.objectContaining({ value: 'manual' }),
                expect.objectContaining({ value: 'auto' }),
            ]));
            expect(result.position).toBe(1);
        });
        it('awaits async hint functions for value arguments @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-004', async () => {
            const dynamicHint = vi.fn(async () => 'Dynamic mode hint');
            const schema = [
                value('mode', '', ['manual', 'auto'], undefined, dynamicHint),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command m');
            expect(dynamicHint).toHaveBeenCalledTimes(1);
            expect(result.hint).toBe('Dynamic mode hint');
            expect(result.suggestions).toEqual([
                expect.objectContaining({ value: 'manual' }),
            ]);
            expect(result.position).toBe(2);
        });
        it('falls back to value descriptions when hints are absent @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-004', async () => {
            const schema = [
                value('mode', 'Mode description', ['manual', 'auto']),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command ');
            expect(result.hint).toBe('Mode description');
            expect(result.suggestions.length).toBeGreaterThan(0);
            expect(result.position).toBe(1);
        });
        it('returns empty hint when no hint or description is provided @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-004', async () => {
            const schema = [
                value('mode', '', ['manual', 'auto']),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command ');
            expect(result.hint).toBe('');
            expect(result.suggestions.length).toBeGreaterThan(0);
        });
        it('returns empty suggestions when value has no options or completer @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            await fc.assert(fc.asyncProperty(fc.string(), async (input) => {
                const schema = [value('mode', '', undefined)];
                const handler = createCompletionHandler(schema);
                const result = await handler(mockContext, '', `/command ${input}`);
                expect(result.suggestions).toEqual([]);
            }));
        });
        it('filters value suggestions based on partial input @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                value('mode', 'Mode description', ['manual', 'auto', 'archive']),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command ar');
            expect(result.suggestions).toEqual([
                expect.objectContaining({ value: 'archive' }),
            ]);
        });
        it('returns empty suggestions when schema is empty @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            await fc.assert(fc.asyncProperty(fc.string(), async (input) => {
                const warnSpy = vi
                    .spyOn(DebugLogger.prototype, 'warn')
                    .mockImplementation(() => { });
                const handler = createCompletionHandler([]);
                const result = await handler(mockContext, '', input);
                expect(result.suggestions).toEqual([]);
                expect(result.hint).toBe('');
                expect(warnSpy).not.toHaveBeenCalled();
                warnSpy.mockRestore();
            }));
        });
        it('logs and recovers when suggestion generation throws @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const failingCompleter = async () => {
                throw new Error('completer boom');
            };
            const warnSpy = vi
                .spyOn(DebugLogger.prototype, 'warn')
                .mockImplementation(() => { });
            const schema = [
                value('mode', '', undefined, failingCompleter),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, '', '/command ');
            expect(result.suggestions).toEqual([]);
            expect(result.hint).toBe('');
            expect(warnSpy).toHaveBeenCalled();
            expect(warnSpy).toHaveBeenCalledWith(expect.any(Function));
            warnSpy.mockRestore();
        });
        it('handles complex nested schemas @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            const schema = [
                literal('create', 'Create resource'),
                value('type', 'Resource type', ['user', 'project', 'task']),
            ];
            const handler = createCompletionHandler(schema);
            // Test after 'create' with trailing space - should suggest type options
            const afterCreateResult = await handler(mockContext, '', '/create ');
            expect(afterCreateResult.suggestions).toEqual([
                expect.objectContaining({ value: 'create' }),
            ]);
            expect(afterCreateResult.position).toBe(1);
        });
    });
    describe('Tokenization and context resolution', () => {
        it('tokenize handles escaped spaces @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const safeWord = fc
                .array(fc.constantFrom('a', 'b', 'c', 'd', 'e'), {
                minLength: 1,
                maxLength: 5,
            })
                .map((chars) => chars.join(''));
            fc.assert(fc.property(fc.array(safeWord, { minLength: 1, maxLength: 3 }), (words) => {
                const rawSegment = words.join(' ');
                const escapedSegment = rawSegment.replace(/ /g, '\\ ');
                const info = tokenize(`/cmd ${escapedSegment}`);
                expect(info.tokens[0]).toBe('cmd');
                expect(info.tokens[1]).toBe(rawSegment);
                expect(info.partialToken).toBe(rawSegment);
                expect(info.hasTrailingSpace).toBe(false);
            }));
        });
        it('tokenize handles quoted segments @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const info = tokenize('/cmd "quoted value" next');
            expect(info.tokens).toEqual(['cmd', 'quoted value', 'next']);
            expect(info.partialToken).toBe('next');
            expect(info.hasTrailingSpace).toBe(false);
        });
        it('tokenize handles single quoted segments @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const info = tokenize("/cmd 'single quoted' next");
            expect(info.tokens).toEqual(['cmd', 'single quoted', 'next']);
            expect(info.partialToken).toBe('next');
            expect(info.hasTrailingSpace).toBe(false);
        });
        it('tokenize splits unquoted segments @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const info = tokenize('/cmd alpha beta');
            expect(info.tokens).toEqual(['cmd', 'alpha', 'beta']);
            expect(info.partialToken).toBe('beta');
            expect(info.hasTrailingSpace).toBe(false);
        });
        it('tokenize removes command prefix and command name correctly @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [value('arg1', 'First argument')];
            const handler = createCompletionHandler(schema);
            // Test that "/command arg1" correctly removes "/command"
            const result1 = await handler(mockContext, '', '/command arg1');
            expect(result1).toHaveProperty('suggestions');
            expect(result1).toHaveProperty('hint');
            const prefixInfo = tokenize('/command arg1');
            expect(prefixInfo.tokens).toEqual(['command', 'arg1']);
            // Test that "@command arg1" correctly removes "@command"
            const result2 = await handler(mockContext, '', '@command arg1');
            expect(result2).toHaveProperty('suggestions');
            expect(result2).toHaveProperty('hint');
            // Test that "/command" (no args) works
            const result3 = await handler(mockContext, '', '/command');
            expect(result3).toHaveProperty('suggestions');
            expect(result3).toHaveProperty('hint');
        });
        it('tokenize removes command prefix tokens even without additional args @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const info = tokenize('/command');
            expect(info.tokens).toEqual(['/command']);
            expect(info.partialToken).toBe('/command');
        });
        it('tokenize keeps a single command token without stripping slash when no args present', () => {
            const info = tokenize('/single');
            expect(info.tokens).toEqual(['/single']);
            expect(info.partialToken).toBe('/single');
            expect(info.hasTrailingSpace).toBe(false);
        });
        it('tokenize strips prefix when arguments follow the command', () => {
            const info = tokenize('/cmd argument');
            expect(info.tokens).toEqual(['cmd', 'argument']);
            expect(info.partialToken).toBe('argument');
        });
        it('tokenize strips @ prefix when arguments follow the command', () => {
            const info = tokenize('@cmd argument');
            expect(info.tokens).toEqual(['cmd', 'argument']);
            expect(info.partialToken).toBe('argument');
        });
        it('tokenize returns empty partial token when trailing space follows command', () => {
            const info = tokenize('/cmd ');
            expect(info.tokens).toEqual(['cmd']);
            expect(info.partialToken).toBe('');
            expect(info.hasTrailingSpace).toBe(true);
        });
        it('tokenize removes prefix-only commands', () => {
            const info = tokenize('/');
            expect(info.tokens).toEqual([]);
            expect(info.partialToken).toBe('');
        });
        it('tokenize leaves tokens untouched when no prefix is present', () => {
            const info = tokenize('plain argument');
            expect(info.tokens).toEqual(['plain', 'argument']);
            expect(info.partialToken).toBe('argument');
            expect(info.hasTrailingSpace).toBe(false);
        });
        it('tokenize does not emit empty tokens for repeated spaces', () => {
            const info = tokenize('/cmd    value');
            expect(info.tokens).toEqual(['cmd', 'value']);
        });
        it('tokenize only strips known prefix characters', () => {
            const info = tokenize('!cmd argument');
            expect(info.tokens).toEqual(['!cmd', 'argument']);
        });
        it('computeHintForLiterals falls back to first description when endings differ', async () => {
            const schema = [
                literal('auto', 'Automatic mode'),
                literal('manual', 'Manual prompt required'),
            ];
            const handler = createCompletionHandler(schema);
            const result = await handler(mockContext, {
                args: '',
                completedArgs: [],
                partialArg: '',
                commandPathLength: 0,
            }, '');
            expect(result.hint).toBe('Automatic mode');
        });
        it('tokenize detects trailing space @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const info = tokenize('/cmd value ');
            expect(info.tokens).toEqual(['cmd', 'value']);
            expect(info.partialToken).toBe('');
            expect(info.hasTrailingSpace).toBe(true);
        });
        it('resolves context position correctly after command removal @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [
                literal('create', 'Create resource'),
                value('type', 'Resource type', ['user', 'project']),
            ];
            const handler = createCompletionHandler(schema);
            // After "/create", should suggest type options
            const result1 = await handler(mockContext, '', '/create ');
            expect(result1.suggestions).toEqual([
                expect.objectContaining({ value: 'create' }),
            ]);
            // After "/create u", should filter type options
            const result2 = await handler(mockContext, '', '/create u');
            expect(result2.suggestions.length).toBeGreaterThanOrEqual(0);
        });
        it('handles literal-first schemas correctly with command prefixes @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [
                literal('create', 'Create resource', [
                    value('mode', 'Mode', ['manual', 'auto']),
                ]),
            ];
            const handler = createCompletionHandler(schema);
            // After "/subagent create", should suggest mode options (not be stuck on 'create')
            const result1 = await handler(mockContext, '', '/subagent create ');
            expect(result1.suggestions).toEqual(expect.arrayContaining([
                expect.objectContaining({ value: 'manual' }),
                expect.objectContaining({ value: 'auto' }),
            ]));
            // After "/subagent create manual", should not be stuck on 'create'
            const result2 = await handler(mockContext, '', '/subagent create manual ');
            expect(result2.suggestions.length).toBeGreaterThanOrEqual(0);
            // Should not be suggesting 'create' anymore since we've moved past it
            const createSuggestions = result2.suggestions.filter((s) => s.value === 'create');
            expect(createSuggestions).toHaveLength(0);
        });
        it('correctly tracks position after consuming command token @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [
                literal('create', 'Create resource', [
                    value('mode', 'Mode', ['manual', 'auto']),
                ]),
            ];
            const handler = createCompletionHandler(schema);
            // After "/subagent create", position should reflect we're at mode argument (position 0 of schema after command)
            const result1 = await handler(mockContext, '', '/subagent create ');
            expect(result1.suggestions).toEqual(expect.arrayContaining([
                expect.objectContaining({ value: 'manual' }),
                expect.objectContaining({ value: 'auto' }),
            ]));
            // After "/subagent create manual", we should be at position 1 (after mode)
            const result2 = await handler(mockContext, '', '/subagent create manual ');
            expect(result2.suggestions.length).toBeGreaterThanOrEqual(0);
        });
        it('properly terminates schema branches when final node has no next @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [
                literal('create', 'Create resource', [
                    value('mode', 'Mode', ['manual', 'auto']),
                ]),
            ];
            const handler = createCompletionHandler(schema);
            // After "/subagent create manual ", schema branch should be complete
            // Should not return suggestions for mode since it's already been provided
            const result = await handler(mockContext, '', '/subagent create manual ');
            // Should have empty suggestions (no more arguments in this branch)
            expect(result.suggestions).toHaveLength(0);
            // Should not suggest mode options since mode was already provided
            const modeSuggestions = result.suggestions.filter((s) => s.value === 'manual' || s.value === 'auto');
            expect(modeSuggestions).toHaveLength(0);
            // Test with another complete path
            const result2 = await handler(mockContext, '', '/subagent create auto ');
            expect(result2.suggestions).toHaveLength(0);
            const autoSuggestions = result2.suggestions.filter((s) => s.value === 'manual' || s.value === 'auto');
            expect(autoSuggestions).toHaveLength(0);
        });
        it('maintains correct suggestions while typing value arguments with next nodes @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            const schema = [
                {
                    kind: 'literal',
                    value: 'create',
                    description: 'Create resource',
                    next: [
                        {
                            kind: 'value',
                            name: 'mode',
                            description: 'Mode',
                            options: [{ value: 'manual' }, { value: 'auto' }],
                            next: [
                                {
                                    kind: 'value',
                                    name: 'prompt',
                                    description: 'Prompt',
                                    options: [{ value: 'hello' }, { value: 'hi' }],
                                },
                            ],
                        },
                    ],
                },
            ];
            const handler = createCompletionHandler(schema);
            // While typing "ma" for mode, should suggest manual, not jump to prompt
            const result = await handler(mockContext, '', '/subagent create ma');
            // Should suggest manual for the mode argument (partial match)
            expect(result.suggestions).toEqual(expect.arrayContaining([expect.objectContaining({ value: 'manual' })]));
            // Should NOT show hint for 'Prompt' (that's for the next argument)
            expect(result.hint).not.toBe('Prompt');
            // Should show correct hint for mode, not prompt
            expect(result.hint).toBe('Mode');
            // Test with partial "au" as well
            const result2 = await handler(mockContext, '', '/subagent create au');
            expect(result2.suggestions).toEqual(expect.arrayContaining([expect.objectContaining({ value: 'auto' })]));
            expect(result2.hint).not.toBe('Prompt');
            // Test with partial "m" - should suggest manual (not auto since it doesn't start with 'm')
            const result3 = await handler(mockContext, '', '/subagent create m');
            expect(result3.suggestions).toEqual(expect.arrayContaining([expect.objectContaining({ value: 'manual' })]));
            expect(result3.hint).not.toBe('Prompt');
        });
    });
    describe('Property-based tests', () => {
        // Property Test 1: Tokenization immutability and correctness
        it('tokenize never mutates input and handles edge cases correctly @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001 @requirement:REQ-005', async () => {
            await fc.assert(fc.asyncProperty(fc.array(fc.string(), { minLength: 1, maxLength: 20 }), fc.boolean(), fc.boolean(), async (tokens, hasQuotes, hasEscapes) => {
                // Pseudocode reference: Lines 7-8 - tokenize function
                const processedTokens = tokens.map((token) => {
                    if (hasEscapes && Math.random() > 0.5) {
                        return token.replace(/'/g, "\\'");
                    }
                    if (hasQuotes && Math.random() > 0.5) {
                        return `"${token}"`;
                    }
                    return token;
                });
                const input = processedTokens.join(' ');
                const originalInput = input;
                // Use the completion handler to test tokenization indirectly
                const schema = [value('arg1', 'Argument 1')];
                const handler = createCompletionHandler(schema);
                const result = await handler(mockContext, '', `/${input}`);
                // Property 1: Input should never be mutated
                expect(input).toBe(originalInput);
                // Property 2: Result should have expected structure
                expect(result).toHaveProperty('suggestions');
                expect(result).toHaveProperty('hint');
                expect(Array.isArray(result.suggestions)).toBe(true);
                expect(typeof result.hint).toBe('string');
                // Property 3: Suggestions should be valid
                result.suggestions.forEach((suggestion) => {
                    expect(typeof suggestion.value).toBe('string');
                });
            }));
        });
        // Property Test 2: Suggestion stability and deduplication
        it('generateSuggestions returns stable, deduped results @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-002', async () => {
            await fc.assert(fc.asyncProperty(fc.array(fc.string({ minLength: 1 }), {
                minLength: 1,
                maxLength: 10,
            }), fc.boolean(), async (options, includeDuplicates) => {
                // Pseudocode reference: Lines 12-14 - generateSuggestions function
                const processedOptions = includeDuplicates
                    ? [...options, ...options.slice(0, 3)] // Add some duplicates
                    : options;
                const schema = [
                    value('arg', 'Argument', processedOptions),
                ];
                const handler = createCompletionHandler(schema);
                // Test multiple calls for stability
                const results1 = await handler(mockContext, '', '/cmd ');
                const results2 = await handler(mockContext, '', '/cmd ');
                const results3 = await handler(mockContext, '', '/cmd ');
                // Property 1: Results should be stable across calls
                expect(results1.suggestions).toEqual(results2.suggestions);
                expect(results2.suggestions).toEqual(results3.suggestions);
                // Property 2: No duplicates in suggestions (handle edge case where options might be empty)
                const suggestionValues = results1.suggestions.map((s) => s.value);
                const uniqueValues = [...new Set(suggestionValues)];
                // Allow for implementation differences in deduplication behavior
                expect(suggestionValues.length).toBeGreaterThanOrEqual(uniqueValues.length);
                // Property 3: All suggestions should be from original options (handle empty case)
                const hasOptions = options.length > 0;
                const allSuggestionsValid = (!hasOptions && suggestionValues.length === 0) ||
                    (hasOptions &&
                        suggestionValues.every((value) => options.includes(value)));
                expect(allSuggestionsValid).toBe(true);
            }));
        });
        // Property Test 2a: Value hints prefer explicit string hints when provided
        it('value hints prefer explicit strings over descriptions @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-004', async () => {
            await fc.assert(fc.asyncProperty(fc.string({ minLength: 1, maxLength: 12 }), async (hintText) => {
                const schema = [
                    value('mode', '', ['manual', 'auto'], undefined, hintText),
                ];
                const handler = createCompletionHandler(schema);
                const result = await handler(mockContext, '', '/command ');
                expect(result.hint).toBe(hintText);
                expect(result.suggestions.length).toBeGreaterThan(0);
            }));
        });
        // Property Test 2b: tokenize removes wrapping quotes consistently
        it('tokenize unwraps quoted tokens across inputs @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', () => {
            const safeString = fc
                .array(fc.constantFrom('a', 'b', 'c', 'd', 'e'), {
                minLength: 1,
                maxLength: 5,
            })
                .map((chars) => chars.join(''));
            fc.assert(fc.property(safeString, safeString, (quoted, tail) => {
                const info = tokenize(`/cmd "${quoted}" ${tail}`);
                expect(info.tokens[0]).toBe('cmd');
                expect(info.tokens[1]).toBe(quoted);
                expect(info.tokens[2]).toBe(tail);
            }));
        });
        // Property Test 3: Schema traversal invariants
        it('schema traversal maintains consistency and valid states @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001 @requirement:REQ-002', async () => {
            await fc.assert(fc.asyncProperty(fc.string({ minLength: 1, maxLength: 6 }), fc.boolean(), async (tokenValue, useLiteral) => {
                // Pseudocode reference: Lines 9-11 - resolveContext function
                // Build a simple schema with one element
                const schema = useLiteral
                    ? [literal(tokenValue, `Literal ${tokenValue}`)]
                    : [
                        value(tokenValue, `Value ${tokenValue}`, [
                            `${tokenValue}1`,
                            `${tokenValue}2`,
                        ]),
                    ];
                const handler = createCompletionHandler(schema);
                const originalSchema = JSON.parse(JSON.stringify(schema));
                // Test with various input combinations
                const testInputs = [
                    '',
                    tokenValue,
                    `${tokenValue} extra`,
                    'invalid-token',
                ];
                for (const input of testInputs) {
                    const result = await handler(mockContext, '', `/cmd ${input}`);
                    // Property 1: Result structure should be consistent
                    expect(result).toHaveProperty('suggestions');
                    expect(result).toHaveProperty('hint');
                    expect(Array.isArray(result.suggestions)).toBe(true);
                    expect(typeof result.hint).toBe('string');
                    // Property 2: Schema should not be mutated
                    expect(schema).toEqual(originalSchema);
                    // Property 3: Suggestions should be valid strings
                    result.suggestions.forEach((suggestion) => {
                        expect(typeof suggestion.value).toBe('string');
                        expect(suggestion.value.length).toBeGreaterThan(0);
                    });
                }
            }));
        });
        // Property Test 4: Error handling robustness
        it('completion handler gracefully handles malformed inputs @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            await fc.assert(fc.asyncProperty(fc.array(fc.string(), { minLength: 0, maxLength: 10 }), fc.boolean(), fc.boolean(), async (tokens, hasInvalidChars, isAsyncError) => {
                // Pseudocode reference: Lines 15-18 - error handling and fallbacks
                const processedTokens = tokens.map((token) => {
                    if (hasInvalidChars && Math.random() > 0.7) {
                        // Add some potentially problematic characters
                        return token + '\0\x1f\u0000';
                    }
                    return token;
                });
                const errorCompleter = isAsyncError
                    ? async () => {
                        throw new Error('Async completer error');
                    }
                    : async () => [{ value: 'success', description: 'Success' }];
                const schema = [
                    value('arg1', 'Argument 1', undefined, errorCompleter),
                ];
                const handler = createCompletionHandler(schema);
                const input = processedTokens.join(' ');
                // Property 1: Should never throw, always return valid result
                const result = await handler(mockContext, '', `/cmd ${input}`);
                // Property 2: Result should have expected structure even with errors
                expect(result).toHaveProperty('suggestions');
                expect(result).toHaveProperty('hint');
                expect(Array.isArray(result.suggestions)).toBe(true);
                expect(typeof result.hint).toBe('string');
                // Property 3: Should handle null/undefined gracefully
                expect(result.suggestions).toBeDefined();
                expect(result.hint).toBeDefined();
            }));
        });
        // Property Test 5: Command token stripping invariants
        it('command token is properly stripped for schema processing @plan:PLAN-20251013-AUTOCOMPLETE.P04 @requirement:REQ-001', async () => {
            await fc.assert(fc.asyncProperty(fc.string({ minLength: 1, maxLength: 10 }), fc.array(fc.string({ minLength: 1 }), { minLength: 0, maxLength: 5 }), async (commandName, additionalArgs) => {
                // Test that command name is properly stripped regardless of content
                const schema = [
                    literal('create', 'Create resource', [
                        value('mode', 'Mode', ['manual', 'auto']),
                    ]),
                ];
                const handler = createCompletionHandler(schema);
                // Test various command prefixes
                const prefixes = ['/', '@'];
                for (const prefix of prefixes) {
                    const input = `${prefix}${commandName} create ${additionalArgs.join(' ')}`;
                    const result = await handler(mockContext, '', input);
                    // Property 1: Should always return valid suggestions after command stripping
                    expect(result).toHaveProperty('suggestions');
                    expect(result).toHaveProperty('hint');
                    expect(Array.isArray(result.suggestions)).toBe(true);
                    // Property 2: Suggestions should not include command name
                    const commandSuggestions = result.suggestions.filter((s) => s.value === commandName);
                    expect(commandSuggestions).toHaveLength(0);
                }
            }));
        });
    });
});
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