package model_test

import (
	"bytes"
	"context"
	"os"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"go.yandata.net/iod/iod/trustlog-sdk/api/model"
)

func TestGetHashTool(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		hashType model.HashType
	}{
		{
			name:     "SHA256",
			hashType: model.SHA256,
		},
		{
			name:     "SHA256Simd",
			hashType: model.Sha256Simd,
		},
		{
			name:     "MD5",
			hashType: model.MD5,
		},
		{
			name:     "SHA1",
			hashType: model.SHA1,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			tool := model.GetHashTool(tt.hashType)
			assert.NotNil(t, tool)
			// Verify it works
			_, err := tool.HashString("test")
			require.NoError(t, err)
			// Verify hash type
			assert.Equal(t, tt.hashType, tool.GetHashType())
		})
	}
}

func TestNewHashTool(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	assert.NotNil(t, tool)
	// Verify it works
	_, err := tool.HashString("test")
	require.NoError(t, err)
}

func TestHashTool_HashString(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		hashType model.HashType
		input    string
		wantErr  bool
	}{
		{
			name:     "SHA256",
			hashType: model.SHA256,
			input:    "test",
			wantErr:  false,
		},
		{
			name:     "SHA256Simd",
			hashType: model.Sha256Simd,
			input:    "test",
			wantErr:  false,
		},
		{
			name:     "MD5",
			hashType: model.MD5,
			input:    "test",
			wantErr:  false,
		},
		{
			name:     "SHA1",
			hashType: model.SHA1,
			input:    "test",
			wantErr:  false,
		},
		{
			name:     "SHA512",
			hashType: model.SHA512,
			input:    "test",
			wantErr:  false,
		},
		{
			name:     "empty string",
			hashType: model.SHA256,
			input:    "",
			wantErr:  false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			tool := model.NewHashTool(tt.hashType)
			result, err := tool.HashString(tt.input)
			if tt.wantErr {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				assert.NotEmpty(t, result)
			}
		})
	}
}

func TestHashTool_HashBytes(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name     string
		hashType model.HashType
		input    []byte
		wantErr  bool
	}{
		{
			name:     "SHA256",
			hashType: model.SHA256,
			input:    []byte("test"),
			wantErr:  false,
		},
		{
			name:     "SHA256Simd",
			hashType: model.Sha256Simd,
			input:    []byte("test"),
			wantErr:  false,
		},
		{
			name:     "empty bytes",
			hashType: model.SHA256,
			input:    []byte{},
			wantErr:  false,
		},
		{
			name:     "large input",
			hashType: model.SHA256,
			input:    make([]byte, 1000),
			wantErr:  false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			tool := model.NewHashTool(tt.hashType)
			result, err := tool.HashBytes(tt.input)
			if tt.wantErr {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				assert.NotEmpty(t, result)
			}
		})
	}
}

func TestHashTool_Deterministic(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	input := "test string"

	result1, err1 := tool.HashString(input)
	require.NoError(t, err1)

	result2, err2 := tool.HashString(input)
	require.NoError(t, err2)

	// Same input should produce same hash
	assert.Equal(t, result1, result2)
}

func TestHashTool_DifferentInputs(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)

	result1, err1 := tool.HashString("input1")
	require.NoError(t, err1)

	result2, err2 := tool.HashString("input2")
	require.NoError(t, err2)

	// Different inputs should produce different hashes
	assert.NotEqual(t, result1, result2)
}

func TestHashTool_StringVsBytes(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	input := "test"

	stringHash, err1 := tool.HashString(input)
	require.NoError(t, err1)

	bytesHash, err2 := tool.HashBytes([]byte(input))
	require.NoError(t, err2)

	// Same data in different formats should produce same hash
	assert.Equal(t, stringHash, bytesHash)
}

func TestHashTool_MultipleTypes(t *testing.T) {
	t.Parallel()

	input := "test"
	hashTypes := []model.HashType{
		model.MD5,
		model.SHA1,
		model.SHA256,
		model.SHA512,
		model.Sha256Simd,
	}

	results := make(map[model.HashType]string)
	for _, hashType := range hashTypes {
		tool := model.NewHashTool(hashType)
		result, err := tool.HashString(input)
		require.NoError(t, err)
		results[hashType] = result
	}

	// All should produce different hashes (except possibly some edge cases)
	// At minimum, verify they all produced valid hashes
	for hashType, result := range results {
		assert.NotEmpty(t, result, "HashType: %v", hashType)
	}
}

func TestHashTool_GetHashTool_Caching(t *testing.T) {
	t.Parallel()

	hashType := model.SHA256
	tool1 := model.GetHashTool(hashType)
	tool2 := model.GetHashTool(hashType)

	// Should return the same instance (cached)
	assert.Equal(t, tool1, tool2)
}

func TestHashTool_HashFile(t *testing.T) {
	t.Parallel()

	// Create a temporary file
	tmpFile := t.TempDir() + "/test.txt"
	err := os.WriteFile(tmpFile, []byte("test content"), 0o600)
	require.NoError(t, err)

	tool := model.NewHashTool(model.SHA256)
	ctx := context.Background()
	result, err := tool.HashFile(ctx, tmpFile)
	require.NoError(t, err)
	assert.NotEmpty(t, result)
}

func TestHashTool_HashFile_NotExists(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	ctx := context.Background()
	_, err := tool.HashFile(ctx, "/nonexistent/file")
	require.Error(t, err)
}

func TestHashTool_HashStream(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	reader := bytes.NewReader([]byte("test content"))

	result, err := tool.HashStream(reader)
	require.NoError(t, err)
	assert.NotEmpty(t, result)
}

func TestHashTool_HashStream_Empty(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	reader := bytes.NewReader([]byte{})

	result, err := tool.HashStream(reader)
	require.NoError(t, err)
	assert.NotEmpty(t, result) // Even empty input produces a hash
}

func TestGetSupportedAlgorithms(t *testing.T) {
	t.Parallel()

	algorithms := model.GetSupportedAlgorithms()
	assert.NotEmpty(t, algorithms)
	assert.Contains(t, algorithms, string(model.SHA256))
	assert.Contains(t, algorithms, string(model.Sha256Simd))
	// Verify case-insensitive check
	assert.True(t, model.IsAlgorithmSupported("SHA256"))
	assert.True(t, model.IsAlgorithmSupported("sha256"))
	assert.True(t, model.IsAlgorithmSupported("sha256-simd"))
}

func TestIsAlgorithmSupported(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name      string
		algorithm string
		expected  bool
	}{
		{
			name:      "SHA256",
			algorithm: "SHA256",
			expected:  true,
		},
		{
			name:      "SHA256 lowercase",
			algorithm: "sha256",
			expected:  true,
		},
		{
			name:      "Sha256Simd",
			algorithm: "sha256-simd",
			expected:  true,
		},
		{
			name:      "Sha256Simd mixed case",
			algorithm: "Sha256-Simd",
			expected:  true,
		},
		{
			name:      "unsupported",
			algorithm: "UNSUPPORTED",
			expected:  false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			result := model.IsAlgorithmSupported(tt.algorithm)
			assert.Equal(t, tt.expected, result)
		})
	}
}

func TestHashTool_GetHashType(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA512)
	assert.Equal(t, model.SHA512, tool.GetHashType())
}

func TestHashTool_AllHashTypes(t *testing.T) {
	t.Parallel()

	hashTypes := []model.HashType{
		model.MD5,
		model.SHA1,
		model.SHA224,
		model.SHA256,
		model.SHA384,
		model.SHA512,
		model.Sha256Simd,
		model.BLAKE3,
	}

	for _, hashType := range hashTypes {
		tool := model.NewHashTool(hashType)
		result, err := tool.HashString("test")
		require.NoError(t, err, "HashType: %v", hashType)
		assert.NotEmpty(t, result, "HashType: %v", hashType)
		assert.Equal(t, hashType, tool.GetHashType())
	}
}

func TestHashTool_CompareHash(t *testing.T) {
	t.Parallel()

	tool := model.NewHashTool(model.SHA256)
	data := "test data"

	// Generate hash
	hash, err := tool.HashString(data)
	require.NoError(t, err)

	tests := []struct {
		name         string
		data         string
		expectedHash string
		shouldMatch  bool
	}{
		{
			name:         "匹配的哈希值",
			data:         data,
			expectedHash: hash,
			shouldMatch:  true,
		},
		{
			name:         "大小写不同但内容相同",
			data:         data,
			expectedHash: strings.ToUpper(hash),
			shouldMatch:  true,
		},
		{
			name:         "不匹配的哈希值",
			data:         data,
			expectedHash: "invalid_hash",
			shouldMatch:  false,
		},
		{
			name:         "不同的数据",
			data:         "different data",
			expectedHash: hash,
			shouldMatch:  false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			match, err := tool.CompareHash(tt.data, tt.expectedHash)
			require.NoError(t, err)
			assert.Equal(t, tt.shouldMatch, match)
		})
	}
}

func TestHashTool_CompareFileHash(t *testing.T) {
	t.Parallel()

	// Create a temporary file
	tmpFile := t.TempDir() + "/test.txt"
	content := []byte("test file content")
	err := os.WriteFile(tmpFile, content, 0o600)
	require.NoError(t, err)

	tool := model.NewHashTool(model.SHA256)
	ctx := context.Background()

	// Generate expected hash
	expectedHash, err := tool.HashFile(ctx, tmpFile)
	require.NoError(t, err)

	tests := []struct {
		name         string
		filePath     string
		expectedHash string
		shouldMatch  bool
		wantErr      bool
	}{
		{
			name:         "匹配的文件哈希",
			filePath:     tmpFile,
			expectedHash: expectedHash,
			shouldMatch:  true,
			wantErr:      false,
		},
		{
			name:         "大小写不同但内容相同",
			filePath:     tmpFile,
			expectedHash: strings.ToUpper(expectedHash),
			shouldMatch:  true,
			wantErr:      false,
		},
		{
			name:         "不匹配的文件哈希",
			filePath:     tmpFile,
			expectedHash: "invalid_hash",
			shouldMatch:  false,
			wantErr:      false,
		},
		{
			name:         "文件不存在",
			filePath:     "/nonexistent/file",
			expectedHash: expectedHash,
			shouldMatch:  false,
			wantErr:      true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			t.Parallel()
			match, err := tool.CompareFileHash(ctx, tt.filePath, tt.expectedHash)
			if tt.wantErr {
				require.Error(t, err)
			} else {
				require.NoError(t, err)
				assert.Equal(t, tt.shouldMatch, match)
			}
		})
	}
}

func TestHashList_GetHashType(t *testing.T) {
	t.Parallel()

	// Create mock hash data
	mockHash := &mockHashData{
		key:      "test-key",
		hash:     "test-hash",
		hashType: model.SHA256,
	}

	hashList := model.HashList{mockHash}
	assert.Equal(t, model.SHA256, hashList.GetHashType())
}

// mockHashData implements HashData interface for testing.
type mockHashData struct {
	key      string
	hash     string
	hashType model.HashType
}

func (m *mockHashData) Key() string {
	return m.key
}

func (m *mockHashData) Hash() string {
	return m.hash
}

func (m *mockHashData) Type() model.HashType {
	return m.hashType
}