package controller

import (
	"encoding/base64"
	"fmt"
	"io"
	"log"
	"path"
	"strconv"
	"strings"

	"ezops/model"

	"github.com/gin-gonic/gin"
)

func (h *KubernetesHandler) ListPodFilesNS(c *gin.Context) {
	h.listPodFilesWithNS(c, c.Param("namespace"))
}
func (h *KubernetesHandler) listPodFilesWithNS(c *gin.Context, ns string) {
	clusterID, _ := strconv.Atoi(c.Param("id"))
	if clusterID == 0 {
		clusterID = h.resolveClusterCode(c.Param("clusterCode"))
	}
	podName := c.Param("podName")
	var req struct {
		Path      string `json:"path"`
		Container string `json:"container"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(400, model.Response{Code: 400, Message: "参数错误: " + err.Error()})
		return
	}
	if req.Path == "" {
		req.Path = "/"
	}
	client, _, err := h.getK8sClient(clusterID)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: err.Error()})
		return
	}
	// ls -la — BusyBox ignores --time-style, use default "Mon DD HH:MM" format
	cmd := []string{"ls", "-la", req.Path}
	result, err := client.ExecInPod(ns, podName, req.Container, cmd)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: "执行 ls 失败: " + err.Error()})
		return
	}

	type FileInfo struct {
		Name    string `json:"name"`
		Size    string `json:"size"`
		Mode    string `json:"mode"`
		ModTime string `json:"mod_time"`
		IsDir   bool   `json:"is_dir"`
	}
	files := []FileInfo{}
	output := result.Stdout // WebSocket output is already clean text
	for _, line := range strings.Split(output, "\n") {
		line = strings.TrimSpace(line)
		if line == "" || strings.HasPrefix(line, "total ") {
			continue
		}
		fields := strings.Fields(line)
		if len(fields) < 7 {
			continue
		}
		mode := fields[0]
		if len(mode) == 0 || (mode[0] != 'd' && mode[0] != '-' && mode[0] != 'l') {
			continue
		}
		size := fields[4]
		// BusyBox ls date format: "Jun 23 02:17" (3 fields: month day time)
		// GNU ls --time-style: "2026-06-23T02:17:00" (1 field)
		// Detect format: if fields[5] contains ":" it's time-only (BusyBox style)
		var name, modTime string
		if strings.Contains(fields[5], ":") || strings.Contains(fields[5], "T") {
			// GNU style: single timestamp field
			modTime = fields[5]
			name = strings.Join(fields[6:], " ")
		} else {
			// BusyBox style: "Mon DD HH:MM" = 3 fields starting at index 5
			modTime = strings.Join(fields[5:8], " ")
			name = strings.Join(fields[8:], " ")
		}
		if name == "" || name == "." || name == ".." {
			continue
		}
		files = append(files, FileInfo{
			Name:    name,
			Size:    size,
			Mode:    mode,
			ModTime: modTime,
			IsDir:   mode[0] == 'd',
		})
	}
	c.JSON(200, model.Response{Code: 200, Message: "success", Data: gin.H{"path": req.Path, "files": files}})
}

// DownloadPodFileNS 下载 Pod 内指定路径的文件（通过 exec cat）
func (h *KubernetesHandler) DownloadPodFileNS(c *gin.Context) {
	h.downloadPodFileWithNS(c, c.Param("namespace"))
}
func (h *KubernetesHandler) downloadPodFileWithNS(c *gin.Context, ns string) {
	clusterID, _ := strconv.Atoi(c.Param("id"))
	if clusterID == 0 {
		clusterID = h.resolveClusterCode(c.Param("clusterCode"))
	}
	podName := c.Param("podName")
	filePath := c.Query("path")
	container := c.Query("container")
	if filePath == "" {
		c.JSON(400, model.Response{Code: 400, Message: "path 参数不能为空"})
		return
	}
	client, _, err := h.getK8sClient(clusterID)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: err.Error()})
		return
	}
	cmd := []string{"cat", filePath}
	result, err := client.ExecInPod(ns, podName, container, cmd)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: "读取文件失败: " + err.Error()})
		return
	}
	content := result.Stdout
	fileName := path.Base(filePath)
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", fileName))
	c.Header("Content-Type", "application/octet-stream")
	c.String(200, content)
}

// UploadPodFileNS 上传文件到 Pod 容器内指定目录（通过 exec base64 分块写入）
func (h *KubernetesHandler) UploadPodFileNS(c *gin.Context) {
	h.uploadPodFileWithNS(c, c.Param("namespace"))
}
func (h *KubernetesHandler) uploadPodFileWithNS(c *gin.Context, ns string) {
	clusterID, _ := strconv.Atoi(c.Param("id"))
	if clusterID == 0 {
		clusterID = h.resolveClusterCode(c.Param("clusterCode"))
	}
	podName := c.Param("podName")
	container := c.PostForm("container")
	targetDir := c.PostForm("path")
	if targetDir == "" {
		targetDir = "/"
	}

	// 读取上传的文件
	file, header, err := c.Request.FormFile("file")
	if err != nil {
		c.JSON(400, model.Response{Code: 400, Message: "文件上传失败: " + err.Error()})
		return
	}
	defer file.Close()

	// 限制文件大小 10MB
	const maxUploadSize = 10 << 20 // 10MB
	if header.Size > maxUploadSize {
		c.JSON(400, model.Response{Code: 400, Message: fmt.Sprintf("文件过大: %d bytes, 上限 %d bytes", header.Size, maxUploadSize)})
		return
	}

	content, err := io.ReadAll(file)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: "读取文件失败: " + err.Error()})
		return
	}

	client, _, err := h.getK8sClient(clusterID)
	if err != nil {
		c.JSON(500, model.Response{Code: 500, Message: err.Error()})
		return
	}

	// 目标完整路径
	targetFile := strings.TrimRight(targetDir, "/") + "/" + header.Filename

	// 确保目标目录存在
	_, _ = client.ExecInPod(ns, podName, container, []string{"mkdir", "-p", targetDir})

	// base64 分块写入：每块 3000 字节 base64 (~2250 bytes 二进制)，保证 URL 长度安全
	encoded := base64.StdEncoding.EncodeToString(content)
	const chunkSize = 3000
	first := true
	for i := 0; i < len(encoded); i += chunkSize {
		end := i + chunkSize
		if end > len(encoded) {
			end = len(encoded)
		}
		chunk := encoded[i:end]
		var cmd []string
		if first {
			// 首块：创建/覆盖文件
			cmd = []string{"sh", "-c", fmt.Sprintf("echo -n '%s' | base64 -d > '%s'", chunk, targetFile)}
			first = false
		} else {
			// 后续块：追加
			cmd = []string{"sh", "-c", fmt.Sprintf("echo -n '%s' | base64 -d >> '%s'", chunk, targetFile)}
		}
		result, err := client.ExecInPod(ns, podName, container, cmd)
		if err != nil {
			stderr := ""
			if result != nil {
				stderr = result.Stderr
			}
			c.JSON(500, model.Response{Code: 500, Message: fmt.Sprintf("写入文件失败 (chunk %d): %s\n%s", i/chunkSize, err.Error(), stderr)})
			return
		}
	}

	// 验证文件大小
	verifyResult, verifyErr := client.ExecInPod(ns, podName, container, []string{"stat", "-c", "%s", targetFile})
	writtenSize := ""
	if verifyErr == nil && verifyResult != nil {
		writtenSize = strings.TrimSpace(verifyResult.Stdout)
	}

	log.Printf("[UploadPodFile] %s/%s → %s (%d bytes, %d chunks)", ns, podName, targetFile, len(content), (len(encoded)+chunkSize-1)/chunkSize)

	c.JSON(200, model.Response{
		Code:    200,
		Message: "上传成功",
		Data: gin.H{
			"path":   targetFile,
			"name":   header.Filename,
			"size":   len(content),
			"verify": writtenSize,
		},
	})
}

// ============================================================================
// M13: 多集群资源对比看板 (Multi-Cluster Comparison Dashboard) // Logan.Li
// ============================================================================

// GetMultiClusterComparison 聚合所有集群的资源数据进行对比