package cc.unitmesh.devins.ui.compose.agent

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.*
import androidx.compose.foundation.text.BasicTextField
import androidx.compose.material3.*
import androidx.compose.runtime.*
import androidx.compose.ui.Alignment
import androidx.compose.ui.Modifier
import androidx.compose.ui.awt.SwingPanel
import androidx.compose.ui.graphics.SolidColor
import androidx.compose.ui.text.TextStyle
import androidx.compose.ui.unit.dp
import cc.unitmesh.devins.ui.compose.icons.AutoDevComposeIcons
import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea
import org.fife.ui.rsyntaxtextarea.SyntaxConstants
import org.fife.ui.rtextarea.RTextScrollPane
import org.fife.ui.rtextarea.SearchContext
import org.fife.ui.rtextarea.SearchEngine
import java.io.File

@Composable
fun FileViewerPanel(
    filePath: String,
    onClose: () -> Unit,
    modifier: Modifier = Modifier,
    startLine: Int? = null,
    endLine: Int? = null
) {
    var textArea by remember { mutableStateOf<RSyntaxTextArea?>(null) }
    var errorMessage by remember { mutableStateOf<String?>(null) }
    var fileName by remember { mutableStateOf("") }
    var isLoading by remember { mutableStateOf(true) }
    var fileContent by remember { mutableStateOf<String?>(null) }
    var showSearchBar by remember { mutableStateOf(false) }
    var searchQuery by remember { mutableStateOf("") }
    var searchMatchInfo by remember { mutableStateOf("") }

    // 异步加载文件内容
    LaunchedEffect(filePath) {
        isLoading = true
        errorMessage = null
        fileContent = null

        kotlinx.coroutines.withContext(kotlinx.coroutines.Dispatchers.IO) {
            try {
                val file = File(filePath)
                if (!file.exists()) {
                    errorMessage = "File not found: $filePath"
                    fileName = filePath
                    return@withContext
                }

                fileName = file.name

                // 检查是否是二进制文件
                if (isBinaryFile(file)) {
                    errorMessage = "Cannot open binary file: ${file.name}"
                    return@withContext
                }

                // 检查文件大小（限制 10MB）
                val maxSize = 10 * 1024 * 1024 // 10MB
                if (file.length() > maxSize) {
                    errorMessage = "File too large (${file.length() / 1024 / 1024}MB). Maximum size is 10MB."
                    return@withContext
                }

                // 异步读取文件
                try {
                    fileContent = file.readText()
                } catch (e: java.nio.charset.MalformedInputException) {
                    errorMessage = "Cannot decode file (likely binary): ${file.name}"
                }
            } catch (e: Exception) {
                errorMessage = "Error loading file: ${e.message}"
                fileName = filePath
            } finally {
                isLoading = false
            }
        }
    }

    Column(
        modifier =
            modifier
                .fillMaxHeight()
                .background(MaterialTheme.colorScheme.surface)
    ) {
        // Header with search functionality
        Surface(
            modifier = Modifier.fillMaxWidth(),
            color = MaterialTheme.colorScheme.surfaceVariant,
            shadowElevation = 2.dp
        ) {
            Column {
                Row(
                    modifier =
                        Modifier
                            .fillMaxWidth()
                            .padding(8.dp),
                    horizontalArrangement = Arrangement.SpaceBetween,
                    verticalAlignment = Alignment.CenterVertically
                ) {
                    Column(modifier = Modifier.weight(1f)) {
                        Text(
                            text = fileName,
                            style = MaterialTheme.typography.titleSmall,
                            color = MaterialTheme.colorScheme.onSurfaceVariant
                        )
                        Text(
                            text = filePath,
                            style = MaterialTheme.typography.bodySmall,
                            color = MaterialTheme.colorScheme.onSurfaceVariant.copy(alpha = 0.7f)
                        )
                    }

                    Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
                        // Search button
                        IconButton(onClick = { showSearchBar = !showSearchBar }) {
                            Icon(
                                imageVector = AutoDevComposeIcons.Search,
                                contentDescription = "Search",
                                tint = MaterialTheme.colorScheme.onSurfaceVariant
                            )
                        }

                        IconButton(onClick = onClose) {
                            Icon(
                                imageVector = AutoDevComposeIcons.Close,
                                contentDescription = "Close",
                                tint = MaterialTheme.colorScheme.onSurfaceVariant
                            )
                        }
                    }
                }

                // Search bar
                if (showSearchBar) {
                    Surface(
                        modifier = Modifier
                            .fillMaxWidth()
                            .padding(horizontal = 8.dp, vertical = 4.dp),
                        color = MaterialTheme.colorScheme.surface,
                        shape = MaterialTheme.shapes.small
                    ) {
                        Row(
                            modifier = Modifier
                                .fillMaxWidth()
                                .padding(8.dp),
                            verticalAlignment = Alignment.CenterVertically,
                            horizontalArrangement = Arrangement.spacedBy(8.dp)
                        ) {
                            BasicTextField(
                                value = searchQuery,
                                onValueChange = {
                                    searchQuery = it
                                    // Perform search
                                    textArea?.let { area ->
                                        if (it.isNotEmpty()) {
                                            val context = SearchContext(it).apply {
                                                matchCase = false
                                                markAll = true
                                            }
                                            val found = SearchEngine.find(area, context)
                                            if (!found.wasFound()) {
                                                searchMatchInfo = "No matches"
                                            } else {
                                                searchMatchInfo = ""
                                            }
                                        } else {
                                            searchMatchInfo = ""
                                            area.clearMarkAllHighlights()
                                        }
                                    }
                                },
                                modifier = Modifier
                                    .weight(1f)
                                    .height(32.dp),
                                textStyle = TextStyle(
                                    color = MaterialTheme.colorScheme.onSurface,
                                    fontSize = MaterialTheme.typography.bodyMedium.fontSize
                                ),
                                cursorBrush = SolidColor(MaterialTheme.colorScheme.primary),
                                decorationBox = { innerTextField ->
                                    Box(
                                        contentAlignment = Alignment.CenterStart
                                    ) {
                                        if (searchQuery.isEmpty()) {
                                            Text(
                                                "Search in file...",
                                                style = MaterialTheme.typography.bodyMedium,
                                                color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.5f)
                                            )
                                        }
                                        innerTextField()
                                    }
                                }
                            )

                            if (searchMatchInfo.isNotEmpty()) {
                                Text(
                                    searchMatchInfo,
                                    style = MaterialTheme.typography.bodySmall,
                                    color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.7f)
                                )
                            }

                            // Navigation buttons
                            Row(horizontalArrangement = Arrangement.spacedBy(4.dp)) {
                                IconButton(
                                    onClick = {
                                        textArea?.let { area ->
                                            val context = SearchContext(searchQuery).apply {
                                                matchCase = false
                                                searchForward = false
                                            }
                                            SearchEngine.find(area, context)
                                        }
                                    },
                                    enabled = searchQuery.isNotEmpty()
                                ) {
                                    Icon(
                                        imageVector = AutoDevComposeIcons.KeyboardArrowUp,
                                        contentDescription = "Previous match",
                                        tint = MaterialTheme.colorScheme.onSurface
                                    )
                                }

                                IconButton(
                                    onClick = {
                                        textArea?.let { area ->
                                            val context = SearchContext(searchQuery).apply {
                                                matchCase = false
                                                searchForward = true
                                            }
                                            SearchEngine.find(area, context)
                                        }
                                    },
                                    enabled = searchQuery.isNotEmpty()
                                ) {
                                    Icon(
                                        imageVector = AutoDevComposeIcons.KeyboardArrowDown,
                                        contentDescription = "Next match",
                                        tint = MaterialTheme.colorScheme.onSurface
                                    )
                                }
                            }

                            IconButton(onClick = {
                                showSearchBar = false
                                searchQuery = ""
                                textArea?.clearMarkAllHighlights()
                            }) {
                                Icon(
                                    imageVector = AutoDevComposeIcons.Close,
                                    contentDescription = "Close search",
                                    tint = MaterialTheme.colorScheme.onSurface
                                )
                            }
                        }
                    }
                }
            }
        }

        // Content
        Box(modifier = Modifier.fillMaxSize()) {
            when {
                isLoading -> {
                    // Loading state
                    Column(
                        modifier =
                            Modifier
                                .fillMaxSize()
                                .padding(16.dp),
                        horizontalAlignment = Alignment.CenterHorizontally,
                        verticalArrangement = Arrangement.Center
                    ) {
                        CircularProgressIndicator(
                            modifier = Modifier.size(48.dp)
                        )
                        Spacer(modifier = Modifier.height(16.dp))
                        Text(
                            text = "Loading file...",
                            style = MaterialTheme.typography.bodyMedium,
                            color = MaterialTheme.colorScheme.onSurface
                        )
                    }
                }
                errorMessage != null -> {
                    // Error state
                    Column(
                        modifier =
                            Modifier
                                .fillMaxSize()
                                .padding(16.dp),
                        horizontalAlignment = Alignment.CenterHorizontally,
                        verticalArrangement = Arrangement.Center
                    ) {
                        Text(
                            text = "❌ Error",
                            style = MaterialTheme.typography.titleMedium,
                            color = MaterialTheme.colorScheme.error
                        )
                        Spacer(modifier = Modifier.height(8.dp))
                        Text(
                            text = errorMessage!!,
                            style = MaterialTheme.typography.bodyMedium,
                            color = MaterialTheme.colorScheme.onSurface
                        )
                    }
                }
                fileContent != null -> {
                    // RSyntaxTextArea content
                    SwingPanel(
                        background = MaterialTheme.colorScheme.surface,
                        modifier = Modifier.fillMaxSize(),
                        factory = {
                            val file = File(filePath)
                            val area =
                                RSyntaxTextArea().apply {
                                    text = fileContent ?: ""
                                    isEditable = false
                                    syntaxEditingStyle = getSyntaxStyleForFile(file)
                                    isCodeFoldingEnabled = true
                                    antiAliasingEnabled = true
                                    tabSize = 4
                                    margin = java.awt.Insets(5, 5, 5, 5)
                                }
                            textArea = area

                            RTextScrollPane(area).apply {
                                isFoldIndicatorEnabled = true
                            }
                        },
                        update = {
                            // Update text if content changes
                            textArea?.let { area ->
                                if (area.text != fileContent) {
                                    val file = File(filePath)
                                    area.text = fileContent ?: ""
                                    area.syntaxEditingStyle = getSyntaxStyleForFile(file)
                                }

                                // Highlight and scroll to specific lines if provided
                                if (startLine != null && startLine > 0) {
                                    try {
                                        val start = startLine - 1 // Convert to 0-based
                                        val end = (endLine ?: startLine) - 1

                                        if (start < area.lineCount) {
                                            val startOffset = area.getLineStartOffset(start)
                                            val endOffset = if (end < area.lineCount) {
                                                area.getLineEndOffset(end)
                                            } else {
                                                area.getLineEndOffset(area.lineCount - 1)
                                            }

                                            // Select the lines
                                            area.select(startOffset, endOffset)

                                            // Scroll to make the selection visible
                                            area.caretPosition = startOffset
                                            area.requestFocusInWindow()
                                        }
                                    } catch (e: Exception) {
                                        // Ignore errors in line highlighting
                                    }
                                }
                            }
                        }
                    )
                }
            }
        }
    }
}

/**
 * Check if a file is likely a binary file
 */
private fun isBinaryFile(file: File): Boolean {
    val extension = file.extension.lowercase()

    // 常见的文本文件扩展名（优先检查，避免误判）
    val textExtensions =
        setOf(
            // 源代码文件（已在 getSyntaxStyleForFile 中处理，但这里也添加以便更早识别）
            "java", "kt", "kts", "js", "ts", "tsx", "py", "xml", "html", "htm", "css", "scss", "sass",
            "json", "yaml", "yml", "md", "markdown", "sql", "sh", "bash", "zsh", "c", "h", "cpp", "hpp",
            "cc", "cxx", "go", "rs", "rb", "php", "cs", "scala", "gradle", "properties", "ini", "conf", "toml",
            // 常见文本文件
            "txt", "log", "csv", "tsv", "rtf", "rst", "tex", "lhs", "hs", "ml", "mli", "scala", "sc",
            "bat", "cmd", "ps1", "fish", "vim", "emacs", "dockerfile", "makefile", "rakefile", "gitignore",
            "gitattributes", "editorconfig", "eslintrc", "prettierrc", "babelrc", "yarnrc", "npmrc"
        )

    if (extension in textExtensions) {
        return false
    }

    // 常见的二进制文件扩展名
    val binaryExtensions =
        setOf(
            // 编译产物
            "class", "jar", "war", "ear", "zip", "tar", "gz", "bz2", "7z", "rar", "xz", "lzma", "lz4",
            // 可执行文件
            "exe", "dll", "so", "dylib", "bin", "app", "msi", "deb", "rpm", "dmg", "pkg", "snap",
            // 图片
            "png", "jpg", "jpeg", "gif", "bmp", "ico", "webp", "tiff", "tif", "svg", "psd", "ai", "eps",
            // 视频
            "mp4", "avi", "mov", "mkv", "wmv", "flv", "webm", "m4v", "3gp", "ogv", "f4v",
            // 音频
            "mp3", "wav", "ogg", "flac", "aac", "wma", "m4a", "opus", "aiff", "au", "ra",
            // 字体
            "ttf", "otf", "woff", "woff2", "eot", "pfb", "pfm",
            // 数据库
            "db", "sqlite", "sqlite3", "mdb", "accdb",
            // 办公文档
            "pdf", "doc", "docx", "xls", "xlsx", "ppt", "pptx", "odt", "ods", "odp",
            // 其他二进制格式
            "obj", "o", "lib", "a", "out", "appimage", "iso", "img", "vmdk", "qcow2"
        )

    if (extension in binaryExtensions) {
        return true
    }

    // 对于没有扩展名或扩展名不明确的文件，进行内容检测
    if (file.length() > 0) {
        try {
            val bytesToCheck = minOf(1024, file.length().toInt()) // 增加检查字节数以提高准确性
            val bytes = file.inputStream().use { it.readNBytes(bytesToCheck) }

            // 更严格的二进制检测阈值
            val binaryThreshold = 0.5 // 提高到 50%，减少误判
            var nonTextCount = 0
            var nullByteCount = 0 // 特别检查 null 字节

            for (byte in bytes) {
                val b = byte.toInt() and 0xFF

                // null 字节是二进制文件的强烈指标
                if (b == 0) {
                    nullByteCount++
                } else if (b < 32 && b != 9 && b != 10 && b != 13) {
                    // 控制字符（除了 tab, 换行, 回车）
                    nonTextCount++
                }
            }

            // 如果发现 null 字节，直接认为是二进制文件
            if (nullByteCount > 0) {
                return true
            }

            // 否则使用更高的阈值判断
            return (nonTextCount.toDouble() / bytes.size) > binaryThreshold
        } catch (e: Exception) {
            // 如果读取文件出错，为了安全起见认为是二进制文件
            return true
        }
    }

    // 空文件认为是文本文件
    return false
}

private fun getSyntaxStyleForFile(file: File): String {
    val extension = file.extension.lowercase()
    val fileName = file.name.lowercase()

    return when {
        // 基于扩展名
        extension == "java" -> SyntaxConstants.SYNTAX_STYLE_JAVA
        extension in setOf("kt", "kts") -> SyntaxConstants.SYNTAX_STYLE_KOTLIN
        extension == "js" -> SyntaxConstants.SYNTAX_STYLE_JAVASCRIPT
        extension == "ts" || extension == "tsx" -> SyntaxConstants.SYNTAX_STYLE_TYPESCRIPT
        extension == "py" -> SyntaxConstants.SYNTAX_STYLE_PYTHON
        extension == "xml" -> SyntaxConstants.SYNTAX_STYLE_XML
        extension in setOf("html", "htm") -> SyntaxConstants.SYNTAX_STYLE_HTML
        extension == "css" || extension == "scss" || extension == "sass" -> SyntaxConstants.SYNTAX_STYLE_CSS
        extension == "json" -> SyntaxConstants.SYNTAX_STYLE_JSON
        extension in setOf("yaml", "yml") -> SyntaxConstants.SYNTAX_STYLE_YAML
        extension in setOf("md", "markdown") -> SyntaxConstants.SYNTAX_STYLE_MARKDOWN
        extension == "sql" -> SyntaxConstants.SYNTAX_STYLE_SQL
        extension in setOf("sh", "bash", "zsh") -> SyntaxConstants.SYNTAX_STYLE_UNIX_SHELL
        extension in setOf("c", "h") -> SyntaxConstants.SYNTAX_STYLE_C
        extension in setOf("cpp", "hpp", "cc", "cxx") -> SyntaxConstants.SYNTAX_STYLE_CPLUSPLUS
        extension == "go" -> SyntaxConstants.SYNTAX_STYLE_GO
        extension == "rs" -> SyntaxConstants.SYNTAX_STYLE_RUST
        extension == "rb" -> SyntaxConstants.SYNTAX_STYLE_RUBY
        extension == "php" -> SyntaxConstants.SYNTAX_STYLE_PHP
        extension == "cs" -> SyntaxConstants.SYNTAX_STYLE_CSHARP
        extension == "scala" -> SyntaxConstants.SYNTAX_STYLE_SCALA
        extension == "gradle" -> SyntaxConstants.SYNTAX_STYLE_GROOVY
        extension in setOf("properties", "ini", "conf", "toml") -> SyntaxConstants.SYNTAX_STYLE_PROPERTIES_FILE

        // 基于文件名（无扩展名文件）
        fileName == "dockerfile" -> SyntaxConstants.SYNTAX_STYLE_DOCKERFILE
        fileName == "makefile" || fileName == "rakefile" -> SyntaxConstants.SYNTAX_STYLE_MAKEFILE
        fileName in setOf("gradlew", "gradlew.bat") -> SyntaxConstants.SYNTAX_STYLE_UNIX_SHELL
        fileName.startsWith(".") -> SyntaxConstants.SYNTAX_STYLE_PROPERTIES_FILE

        else -> SyntaxConstants.SYNTAX_STYLE_NONE
    }
}