module main

import rand
import time
import crypto.sha1
import encoding.base64
import net.urllib

// ============================================================================
// Property 1: Upload-Download Round Trip (OSS)
// Property 4: Presigned URL Validity (OSS)
// Feature: v-hono-upload-integration, Property 1 & 4
// Validates: Requirements 4.4, 4.5
//
// Since we cannot test against a real Aliyun OSS server without credentials,
// these tests verify:
// 1. Aliyun OSS storage provider creation and configuration validation
// 2. Presigned URL generation format and structure
// 3. Aliyun OSS signing algorithm correctness
// 4. Internal/External endpoint switching
// ============================================================================

const test_iterations = 100

// ============================================================================
// Type definitions (copied from storage modules for standalone testing)
// ============================================================================

struct StorageResult {
pub:
	success    bool
	object_key string
	etag       string
	size       i64
	error_msg  string
}

struct ObjectInfo {
pub:
	key           string
	size          i64
	etag          string
	content_type  string
	last_modified i64
	metadata      map[string]string
}

struct ListOptions {
pub:
	prefix      string
	delimiter   string
	max_keys    int = 1000
	start_after string
}

struct ListResult {
pub:
	objects         []ObjectInfo
	common_prefixes []string
	is_truncated    bool
	next_marker     string
}

struct PresignOptions {
pub:
	expires_in   int    = 3600
	method       string = 'GET'
	content_type string
}

struct PartInfo {
pub:
	part_number int
	etag        string
	size        i64
}

struct AliyunOSSConfig {
pub:
	endpoint          string
	access_key_id     string
	access_key_secret string
	internal_endpoint string
	default_bucket    string
}

struct ConfigValidationResult {
pub:
	valid          bool
	missing_fields []string
	error_message  string
}


// ============================================================================
// AliyunOSS implementation (minimal for testing)
// ============================================================================

struct AliyunOSS {
	config AliyunOSSConfig
mut:
	multipart_uploads map[string]OSSMultipartUploadState
	use_internal      bool
}

struct OSSMultipartUploadState {
mut:
	bucket       string
	key          string
	upload_id    string
	content_type string
	parts        map[int]PartInfo
	created_at   i64
}

fn validate_aliyun_oss_config(config AliyunOSSConfig) ConfigValidationResult {
	mut missing := []string{}

	if config.endpoint == '' {
		missing << 'aliyun_oss.endpoint'
	}
	if config.access_key_id == '' {
		missing << 'aliyun_oss.access_key_id'
	}
	if config.access_key_secret == '' {
		missing << 'aliyun_oss.access_key_secret'
	}
	if config.default_bucket == '' {
		missing << 'aliyun_oss.default_bucket'
	}

	if missing.len > 0 {
		return ConfigValidationResult{
			valid: false
			missing_fields: missing
			error_message: 'Missing required fields: ${missing.join(", ")}'
		}
	}

	return ConfigValidationResult{
		valid: true
		missing_fields: []string{}
		error_message: ''
	}
}

fn new_aliyun_oss(config AliyunOSSConfig) !AliyunOSS {
	validation := validate_aliyun_oss_config(config)
	if !validation.valid {
		return error(validation.error_message)
	}

	return AliyunOSS{
		config: config
		multipart_uploads: map[string]OSSMultipartUploadState{}
		use_internal: false
	}
}

fn new_aliyun_oss_internal(config AliyunOSSConfig) !AliyunOSS {
	validation := validate_aliyun_oss_config(config)
	if !validation.valid {
		return error(validation.error_message)
	}

	if config.internal_endpoint == '' {
		return error('Internal endpoint is not configured')
	}

	return AliyunOSS{
		config: config
		multipart_uploads: map[string]OSSMultipartUploadState{}
		use_internal: true
	}
}

fn (o AliyunOSS) provider_name() string {
	return 'aliyun_oss'
}

fn (o AliyunOSS) get_current_endpoint() string {
	if o.use_internal && o.config.internal_endpoint != '' {
		return o.config.internal_endpoint
	}
	return o.config.endpoint
}

fn (mut o AliyunOSS) switch_to_internal() ! {
	if o.config.internal_endpoint == '' {
		return error('Internal endpoint is not configured')
	}
	o.use_internal = true
}

fn (mut o AliyunOSS) switch_to_external() {
	o.use_internal = false
}

fn (o AliyunOSS) get_host(bucket string) string {
	endpoint := o.get_current_endpoint()
	if bucket != '' {
		return '${bucket}.${endpoint}'
	}
	return endpoint
}


// URL encoding for key (preserving /)
fn (o AliyunOSS) encode_key(key string) string {
	parts := key.split('/')
	mut encoded_parts := []string{}
	for part in parts {
		encoded_parts << urllib.query_escape(part)
	}
	return encoded_parts.join('/')
}

// Build canonicalized resource
fn (o AliyunOSS) build_canonicalized_resource(bucket string, key string, query_params map[string]string) string {
	mut resource := ''

	if bucket != '' {
		resource = '/${bucket}'
	}

	if key != '' {
		resource += '/${key}'
	} else if bucket != '' {
		resource += '/'
	} else {
		resource = '/'
	}

	sub_resources := [
		'acl', 'uploads', 'location', 'cors', 'logging', 'website', 'referer',
		'lifecycle', 'delete', 'append', 'tagging', 'objectMeta', 'uploadId',
		'partNumber', 'security-token', 'position', 'img', 'style', 'styleName',
		'replication', 'replicationProgress', 'replicationLocation', 'cname',
		'bucketInfo', 'comp', 'qos', 'live', 'status', 'vod', 'startTime',
		'endTime', 'symlink', 'x-oss-process', 'response-content-type',
		'response-content-language', 'response-expires', 'response-cache-control',
		'response-content-disposition', 'response-content-encoding',
	]

	mut sub_params := []string{}
	for param in sub_resources {
		if param in query_params {
			value := query_params[param]
			if value != '' {
				sub_params << '${param}=${value}'
			} else {
				sub_params << param
			}
		}
	}

	if sub_params.len > 0 {
		resource += '?' + sub_params.join('&')
	}

	return resource
}

// HMAC-SHA1 implementation
fn oss_test_hmac_sha1(key []u8, data []u8) []u8 {
	block_size := 64
	mut k := key.clone()

	if k.len > block_size {
		k = sha1.sum(k)
	}

	for k.len < block_size {
		k << u8(0)
	}

	mut i_pad := []u8{len: block_size}
	mut o_pad := []u8{len: block_size}
	for i in 0 .. block_size {
		i_pad[i] = k[i] ^ u8(0x36)
		o_pad[i] = k[i] ^ u8(0x5c)
	}

	mut inner_data := i_pad.clone()
	inner_data << data
	inner_hash := sha1.sum(inner_data)

	mut outer_data := o_pad.clone()
	outer_data << inner_hash
	return sha1.sum(outer_data)
}

fn (o AliyunOSS) calculate_signature(string_to_sign string) string {
	signature := oss_test_hmac_sha1(o.config.access_key_secret.bytes(), string_to_sign.bytes())
	return base64.encode(signature)
}


fn (o AliyunOSS) presign_url(bucket string, key string, options PresignOptions) !string {
	now := time.utc()
	expires := now.unix() + i64(options.expires_in)

	mut content_type := ''
	if options.content_type != '' {
		content_type = options.content_type
	}

	canonicalized_resource := o.build_canonicalized_resource(bucket, key, map[string]string{})

	string_to_sign := '${options.method}\n\n${content_type}\n${expires}\n${canonicalized_resource}'

	signature := o.calculate_signature(string_to_sign)

	host := o.get_host(bucket)
	encoded_key := o.encode_key(key)

	mut url := 'https://${host}/${encoded_key}'
	url += '?OSSAccessKeyId=${urllib.query_escape(o.config.access_key_id)}'
	url += '&Expires=${expires}'
	url += '&Signature=${urllib.query_escape(signature)}'

	return url
}

// ============================================================================
// Test infrastructure
// ============================================================================

struct PropertyTestStats {
mut:
	total_tests  int
	passed_tests int
	failed_tests int
}

fn (mut stats PropertyTestStats) run_property_test(test_name string, test_func fn () bool) {
	stats.total_tests++
	print('🔬 ${test_name}... ')

	if test_func() {
		stats.passed_tests++
		println('✅')
	} else {
		stats.failed_tests++
		println('❌')
	}
}

fn (stats PropertyTestStats) print_summary() {
	println('\n=== Aliyun OSS Storage 属性测试总结 ===')
	println('总测试数: ${stats.total_tests}')
	println('通过: ${stats.passed_tests}')
	println('失败: ${stats.failed_tests}')

	if stats.failed_tests == 0 {
		println('🎉 所有属性测试通过！')
	} else {
		println('⚠️  有 ${stats.failed_tests} 个属性测试失败')
	}
}

fn generate_random_string(min_len int, max_len int) string {
	chars := 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
	len := rand.int_in_range(min_len, max_len) or { min_len }
	mut result := ''
	for _ in 0 .. len {
		idx := rand.int_in_range(0, chars.len) or { 0 }
		result += chars[idx].ascii_str()
	}
	return result
}

fn generate_random_oss_config() AliyunOSSConfig {
	regions := ['cn-hangzhou', 'cn-shanghai', 'cn-beijing', 'cn-shenzhen', 'cn-hongkong']
	region_idx := rand.int_in_range(0, regions.len) or { 0 }
	region := regions[region_idx]

	return AliyunOSSConfig{
		endpoint: 'oss-${region}.aliyuncs.com'
		access_key_id: generate_random_string(16, 24)
		access_key_secret: generate_random_string(30, 40)
		internal_endpoint: 'oss-${region}-internal.aliyuncs.com'
		default_bucket: generate_random_string(5, 15).to_lower()
	}
}

fn generate_random_oss_config_no_internal() AliyunOSSConfig {
	regions := ['cn-hangzhou', 'cn-shanghai', 'cn-beijing', 'cn-shenzhen']
	region_idx := rand.int_in_range(0, regions.len) or { 0 }
	region := regions[region_idx]

	return AliyunOSSConfig{
		endpoint: 'oss-${region}.aliyuncs.com'
		access_key_id: generate_random_string(16, 24)
		access_key_secret: generate_random_string(30, 40)
		internal_endpoint: ''
		default_bucket: generate_random_string(5, 15).to_lower()
	}
}

fn generate_random_filename() string {
	chars := 'abcdefghijklmnopqrstuvwxyz0123456789'
	len := rand.int_in_range(5, 20) or { 10 }
	mut result := ''
	for _ in 0 .. len {
		idx := rand.int_in_range(0, chars.len) or { 0 }
		result += chars[idx].ascii_str()
	}
	extensions := ['.txt', '.bin', '.dat', '.json', '.xml', '.png', '.jpg']
	ext_idx := rand.int_in_range(0, extensions.len) or { 0 }
	return result + extensions[ext_idx]
}


// ============================================================================
// Property 1: Aliyun OSS Storage Provider Creation
// For any valid Aliyun OSS configuration, creating a storage provider should succeed
// Validates: Requirements 4.1, 4.2
// ============================================================================
fn test_property_1_oss_provider_creation() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config()

		storage := new_aliyun_oss(config) or {
			println('  Iteration ${i}: Failed to create Aliyun OSS storage: ${err}')
			return false
		}

		if storage.provider_name() != 'aliyun_oss' {
			println('  Iteration ${i}: Provider name mismatch. Expected: aliyun_oss, Got: ${storage.provider_name()}')
			return false
		}
	}

	return true
}

// ============================================================================
// Property 2: Invalid Configuration Rejection
// For any Aliyun OSS configuration with missing required fields, creation should fail
// Validates: Requirements 4.2
// ============================================================================
fn test_property_2_invalid_config_rejection() bool {
	// Test missing endpoint
	for _ in 0 .. 10 {
		config := AliyunOSSConfig{
			endpoint: ''
			access_key_id: generate_random_string(16, 24)
			access_key_secret: generate_random_string(30, 40)
			default_bucket: generate_random_string(5, 15)
		}

		_ := new_aliyun_oss(config) or {
			continue
		}
		println('  Missing endpoint should have failed')
		return false
	}

	// Test missing access_key_id
	for _ in 0 .. 10 {
		config := AliyunOSSConfig{
			endpoint: 'oss-cn-hangzhou.aliyuncs.com'
			access_key_id: ''
			access_key_secret: generate_random_string(30, 40)
			default_bucket: generate_random_string(5, 15)
		}

		_ := new_aliyun_oss(config) or {
			continue
		}
		println('  Missing access_key_id should have failed')
		return false
	}

	// Test missing access_key_secret
	for _ in 0 .. 10 {
		config := AliyunOSSConfig{
			endpoint: 'oss-cn-hangzhou.aliyuncs.com'
			access_key_id: generate_random_string(16, 24)
			access_key_secret: ''
			default_bucket: generate_random_string(5, 15)
		}

		_ := new_aliyun_oss(config) or {
			continue
		}
		println('  Missing access_key_secret should have failed')
		return false
	}

	// Test missing default_bucket
	for _ in 0 .. 10 {
		config := AliyunOSSConfig{
			endpoint: 'oss-cn-hangzhou.aliyuncs.com'
			access_key_id: generate_random_string(16, 24)
			access_key_secret: generate_random_string(30, 40)
			default_bucket: ''
		}

		_ := new_aliyun_oss(config) or {
			continue
		}
		println('  Missing default_bucket should have failed')
		return false
	}

	return true
}

// ============================================================================
// Property 3: Internal/External Endpoint Switching
// For any Aliyun OSS configuration with internal endpoint, switching should work correctly
// Validates: Requirements 4.3
// ============================================================================
fn test_property_3_endpoint_switching() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config()

		mut storage := new_aliyun_oss(config) or {
			println('  Iteration ${i}: Failed to create storage: ${err}')
			return false
		}

		// Verify initial endpoint is external
		initial_endpoint := storage.get_current_endpoint()
		if initial_endpoint != config.endpoint {
			println('  Iteration ${i}: Initial endpoint mismatch. Expected: ${config.endpoint}, Got: ${initial_endpoint}')
			return false
		}

		// Switch to internal endpoint
		storage.switch_to_internal() or {
			println('  Iteration ${i}: Failed to switch to internal endpoint: ${err}')
			return false
		}

		// Verify endpoint is now internal
		internal_endpoint := storage.get_current_endpoint()
		if internal_endpoint != config.internal_endpoint {
			println('  Iteration ${i}: Internal endpoint mismatch. Expected: ${config.internal_endpoint}, Got: ${internal_endpoint}')
			return false
		}

		// Switch back to external endpoint
		storage.switch_to_external()

		// Verify endpoint is back to external
		external_endpoint := storage.get_current_endpoint()
		if external_endpoint != config.endpoint {
			println('  Iteration ${i}: External endpoint mismatch after switch back. Expected: ${config.endpoint}, Got: ${external_endpoint}')
			return false
		}
	}

	return true
}


// ============================================================================
// Property 4: Internal Endpoint Switching Without Config Should Fail
// For any Aliyun OSS configuration without internal endpoint, switching should fail
// Validates: Requirements 4.3
// ============================================================================
fn test_property_4_internal_switch_without_config() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config_no_internal()

		mut storage := new_aliyun_oss(config) or {
			println('  Iteration ${i}: Failed to create storage: ${err}')
			return false
		}

		// Attempt to switch to internal endpoint should fail
		storage.switch_to_internal() or {
			continue
		}
		println('  Iteration ${i}: Switch to internal should have failed without internal_endpoint configured')
		return false
	}

	return true
}

// ============================================================================
// Property 5: Presigned URL Format Validity
// For any valid Aliyun OSS configuration and object key, the presigned URL should:
// - Contain the correct scheme (https)
// - Contain the correct host (bucket.endpoint)
// - Contain the object key
// - Contain required OSS signature parameters
// Validates: Requirements 4.4, 4.5
// ============================================================================
fn test_property_5_presigned_url_format() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config()
		bucket := config.default_bucket
		key := generate_random_filename()

		storage := new_aliyun_oss(config) or {
			println('  Iteration ${i}: Failed to create storage: ${err}')
			return false
		}

		options := PresignOptions{
			expires_in: 3600
			method: 'GET'
		}

		url := storage.presign_url(bucket, key, options) or {
			println('  Iteration ${i}: Failed to generate presigned URL: ${err}')
			return false
		}

		// 1. Should start with https://
		if !url.starts_with('https://') {
			println('  Iteration ${i}: URL should start with https://, got: ${url}')
			return false
		}

		// 2. Should contain bucket in host (virtual-hosted-style)
		expected_host := '${bucket}.${config.endpoint}'
		if !url.contains(expected_host) {
			println('  Iteration ${i}: URL should contain host "${expected_host}", got: ${url}')
			return false
		}

		// 3. Should contain the object key
		if !url.contains(key) {
			println('  Iteration ${i}: URL should contain key "${key}", got: ${url}')
			return false
		}

		// 4. Should contain OSS signature parameters
		required_params := ['OSSAccessKeyId', 'Expires', 'Signature']
		for param in required_params {
			if !url.contains(param) {
				println('  Iteration ${i}: URL missing required parameter "${param}", got: ${url}')
				return false
			}
		}
	}

	return true
}

// ============================================================================
// Property 6: Presigned URL Expiration Parameter
// For any expiration time, the presigned URL should contain the correct Expires value
// Validates: Requirements 4.4
// ============================================================================
fn test_property_6_presigned_url_expiration() bool {
	config := generate_random_oss_config()
	bucket := config.default_bucket
	key := generate_random_filename()

	storage := new_aliyun_oss(config) or {
		println('  Failed to create storage: ${err}')
		return false
	}

	expiration_times := [60, 300, 900, 1800, 3600, 7200, 86400]

	for expires_in in expiration_times {
		options := PresignOptions{
			expires_in: expires_in
			method: 'GET'
		}

		url := storage.presign_url(bucket, key, options) or {
			println('  Failed to generate presigned URL with expires_in=${expires_in}: ${err}')
			return false
		}

		// Verify URL contains Expires parameter
		if !url.contains('Expires=') {
			println('  URL should contain Expires parameter, got: ${url}')
			return false
		}

		// The Expires value should be a Unix timestamp (current time + expires_in)
		if expires_idx := url.index('Expires=') {
			expires_start := expires_idx + 8
			mut expires_end := expires_start
			for expires_end < url.len && url[expires_end] != `&` {
				expires_end++
			}
			expires_str := url[expires_start..expires_end]
			expires_value := expires_str.i64()

			// Should be a reasonable Unix timestamp (after year 2020)
			if expires_value < 1577836800 {
				println('  Expires value ${expires_value} seems too small')
				return false
			}
		}
	}

	return true
}


// ============================================================================
// Property 7: Presigned URL Method Parameter
// For different HTTP methods, the presigned URL should be generated correctly
// Validates: Requirements 4.4
// ============================================================================
fn test_property_7_presigned_url_methods() bool {
	config := generate_random_oss_config()
	bucket := config.default_bucket
	key := generate_random_filename()

	storage := new_aliyun_oss(config) or {
		println('  Failed to create storage: ${err}')
		return false
	}

	methods := ['GET', 'PUT', 'DELETE', 'HEAD']

	for method in methods {
		options := PresignOptions{
			expires_in: 3600
			method: method
		}

		url := storage.presign_url(bucket, key, options) or {
			println('  Failed to generate presigned URL for method ${method}: ${err}')
			return false
		}

		if url == '' {
			println('  Empty URL generated for method ${method}')
			return false
		}

		if !url.contains('Signature=') {
			println('  URL for method ${method} missing signature')
			return false
		}
	}

	return true
}

// ============================================================================
// Property 8: Nested Path Key Handling
// For keys with nested paths, the presigned URL should handle them correctly
// Validates: Requirements 4.4
// ============================================================================
fn test_property_8_nested_path_handling() bool {
	config := generate_random_oss_config()
	bucket := config.default_bucket

	storage := new_aliyun_oss(config) or {
		println('  Failed to create storage: ${err}')
		return false
	}

	for i in 0 .. test_iterations {
		// Generate nested path
		depth := rand.int_in_range(1, 5) or { 2 }
		mut path_parts := []string{}
		for _ in 0 .. depth {
			part_len := rand.int_in_range(3, 10) or { 5 }
			mut part := ''
			for _ in 0 .. part_len {
				idx := rand.int_in_range(0, 26) or { 0 }
				part += ('a'[0] + u8(idx)).ascii_str()
			}
			path_parts << part
		}
		path_parts << generate_random_filename()
		key := path_parts.join('/')

		options := PresignOptions{
			expires_in: 3600
			method: 'GET'
		}

		url := storage.presign_url(bucket, key, options) or {
			println('  Iteration ${i}: Failed to generate presigned URL for nested key "${key}": ${err}')
			return false
		}

		// URL should contain the key parts
		for part in path_parts {
			if !url.contains(part) {
				println('  Iteration ${i}: URL should contain path part "${part}", got: ${url}')
				return false
			}
		}
	}

	return true
}

// ============================================================================
// Property 9: Internal Endpoint Provider Creation
// For any valid Aliyun OSS configuration with internal endpoint, creating an internal provider should succeed
// Validates: Requirements 4.3
// ============================================================================
fn test_property_9_internal_provider_creation() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config()

		storage := new_aliyun_oss_internal(config) or {
			println('  Iteration ${i}: Failed to create internal Aliyun OSS storage: ${err}')
			return false
		}

		if storage.provider_name() != 'aliyun_oss' {
			println('  Iteration ${i}: Provider name mismatch. Expected: aliyun_oss, Got: ${storage.provider_name()}')
			return false
		}

		current_endpoint := storage.get_current_endpoint()
		if current_endpoint != config.internal_endpoint {
			println('  Iteration ${i}: Endpoint should be internal. Expected: ${config.internal_endpoint}, Got: ${current_endpoint}')
			return false
		}
	}

	return true
}

// ============================================================================
// Property 10: Internal Provider Creation Without Config Should Fail
// For any Aliyun OSS configuration without internal endpoint, creating an internal provider should fail
// Validates: Requirements 4.3
// ============================================================================
fn test_property_10_internal_provider_without_config() bool {
	for i in 0 .. test_iterations {
		config := generate_random_oss_config_no_internal()

		_ := new_aliyun_oss_internal(config) or {
			continue
		}
		println('  Iteration ${i}: Creating internal provider should have failed without internal_endpoint configured')
		return false
	}

	return true
}


fn main() {
	println('🚀 开始 Aliyun OSS Storage 属性测试...')
	println('Feature: v-hono-upload-integration, Property 1 & 4: Upload-Download Round Trip (OSS) & Presigned URL Validity')
	println('Validates: Requirements 4.4, 4.5')
	println('每个属性测试运行 ${test_iterations} 次迭代\n')

	rand.seed([u32(time.now().unix()), u32(67890)])

	mut stats := PropertyTestStats{}

	// Run property tests
	stats.run_property_test('Property 1: Aliyun OSS Storage Provider Creation', test_property_1_oss_provider_creation)
	stats.run_property_test('Property 2: Invalid Configuration Rejection', test_property_2_invalid_config_rejection)
	stats.run_property_test('Property 3: Internal/External Endpoint Switching', test_property_3_endpoint_switching)
	stats.run_property_test('Property 4: Internal Switch Without Config Should Fail', test_property_4_internal_switch_without_config)
	stats.run_property_test('Property 5: Presigned URL Format Validity', test_property_5_presigned_url_format)
	stats.run_property_test('Property 6: Presigned URL Expiration Parameter', test_property_6_presigned_url_expiration)
	stats.run_property_test('Property 7: Presigned URL Method Parameter', test_property_7_presigned_url_methods)
	stats.run_property_test('Property 8: Nested Path Key Handling', test_property_8_nested_path_handling)
	stats.run_property_test('Property 9: Internal Endpoint Provider Creation', test_property_9_internal_provider_creation)
	stats.run_property_test('Property 10: Internal Provider Without Config Should Fail', test_property_10_internal_provider_without_config)

	stats.print_summary()

	if stats.failed_tests > 0 {
		exit(1)
	}
}