"use client";

import { useCallback, useState } from "react";
import {
  useAppStore,
  FileTreeNode,
  ProjectAnalysis,
  Feature,
} from "@/store/app-store";
import { getElectronAPI } from "@/lib/electron";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import {
  Folder,
  FolderOpen,
  File,
  ChevronRight,
  ChevronDown,
  Search,
  RefreshCw,
  BarChart3,
  FileCode,
  Loader2,
  FileText,
  CheckCircle,
  AlertCircle,
  ListChecks,
} from "lucide-react";
import { cn } from "@/lib/utils";

const IGNORE_PATTERNS = [
  "node_modules",
  ".git",
  ".next",
  "dist",
  "build",
  ".DS_Store",
  "*.log",
  ".cache",
  "coverage",
  "__pycache__",
  ".pytest_cache",
  ".venv",
  "venv",
  ".env",
];

const shouldIgnore = (name: string) => {
  return IGNORE_PATTERNS.some((pattern) => {
    if (pattern.startsWith("*")) {
      return name.endsWith(pattern.slice(1));
    }
    return name === pattern;
  });
};

const getExtension = (filename: string): string => {
  const parts = filename.split(".");
  return parts.length > 1 ? parts.pop() || "" : "";
};

export function AnalysisView() {
  const {
    currentProject,
    projectAnalysis,
    isAnalyzing,
    setProjectAnalysis,
    setIsAnalyzing,
    clearAnalysis,
  } = useAppStore();

  const [expandedFolders, setExpandedFolders] = useState<Set<string>>(
    new Set()
  );
  const [isGeneratingSpec, setIsGeneratingSpec] = useState(false);
  const [specGenerated, setSpecGenerated] = useState(false);
  const [specError, setSpecError] = useState<string | null>(null);
  const [isGeneratingFeatureList, setIsGeneratingFeatureList] = useState(false);
  const [featureListGenerated, setFeatureListGenerated] = useState(false);
  const [featureListError, setFeatureListError] = useState<string | null>(null);

  // Recursively scan directory
  const scanDirectory = useCallback(
    async (path: string, depth: number = 0): Promise<FileTreeNode[]> => {
      if (depth > 10) return []; // Prevent infinite recursion

      const api = getElectronAPI();
      try {
        const result = await api.readdir(path);
        if (!result.success || !result.entries) return [];

        const nodes: FileTreeNode[] = [];
        const entries = result.entries.filter((e) => !shouldIgnore(e.name));

        for (const entry of entries) {
          const fullPath = `${path}/${entry.name}`;
          const node: FileTreeNode = {
            name: entry.name,
            path: fullPath,
            isDirectory: entry.isDirectory,
            extension: entry.isFile ? getExtension(entry.name) : undefined,
          };

          if (entry.isDirectory) {
            // Recursively scan subdirectories
            node.children = await scanDirectory(fullPath, depth + 1);
          }

          nodes.push(node);
        }

        // Sort: directories first, then files alphabetically
        nodes.sort((a, b) => {
          if (a.isDirectory && !b.isDirectory) return -1;
          if (!a.isDirectory && b.isDirectory) return 1;
          return a.name.localeCompare(b.name);
        });

        return nodes;
      } catch (error) {
        console.error("Failed to scan directory:", path, error);
        return [];
      }
    },
    []
  );

  // Count files and directories
  const countNodes = (
    nodes: FileTreeNode[]
  ): { files: number; dirs: number; byExt: Record<string, number> } => {
    let files = 0;
    let dirs = 0;
    const byExt: Record<string, number> = {};

    const traverse = (items: FileTreeNode[]) => {
      for (const item of items) {
        if (item.isDirectory) {
          dirs++;
          if (item.children) traverse(item.children);
        } else {
          files++;
          if (item.extension) {
            byExt[item.extension] = (byExt[item.extension] || 0) + 1;
          } else {
            byExt["(no extension)"] = (byExt["(no extension)"] || 0) + 1;
          }
        }
      }
    };

    traverse(nodes);
    return { files, dirs, byExt };
  };

  // Run the analysis
  const runAnalysis = useCallback(async () => {
    if (!currentProject) return;

    setIsAnalyzing(true);
    clearAnalysis();

    try {
      const fileTree = await scanDirectory(currentProject.path);
      const counts = countNodes(fileTree);

      const analysis: ProjectAnalysis = {
        fileTree,
        totalFiles: counts.files,
        totalDirectories: counts.dirs,
        filesByExtension: counts.byExt,
        analyzedAt: new Date().toISOString(),
      };

      setProjectAnalysis(analysis);
    } catch (error) {
      console.error("Analysis failed:", error);
    } finally {
      setIsAnalyzing(false);
    }
  }, [
    currentProject,
    setIsAnalyzing,
    clearAnalysis,
    scanDirectory,
    setProjectAnalysis,
  ]);

  // Generate app_spec.txt from analysis
  const generateSpec = useCallback(async () => {
    if (!currentProject || !projectAnalysis) return;

    setIsGeneratingSpec(true);
    setSpecError(null);
    setSpecGenerated(false);

    try {
      const api = getElectronAPI();

      // Read key files to understand the project better
      const fileContents: Record<string, string> = {};
      const keyFiles = ["package.json", "README.md", "tsconfig.json"];

      // Collect file paths from analysis
      const collectFilePaths = (
        nodes: FileTreeNode[],
        maxDepth: number = 3,
        currentDepth: number = 0
      ): string[] => {
        const paths: string[] = [];
        for (const node of nodes) {
          if (!node.isDirectory) {
            paths.push(node.path);
          } else if (node.children && currentDepth < maxDepth) {
            paths.push(
              ...collectFilePaths(node.children, maxDepth, currentDepth + 1)
            );
          }
        }
        return paths;
      };

      const allFilePaths = collectFilePaths(projectAnalysis.fileTree);

      // Try to read key configuration files
      for (const keyFile of keyFiles) {
        const filePath = `${currentProject.path}/${keyFile}`;
        const exists = await api.exists(filePath);
        if (exists) {
          const result = await api.readFile(filePath);
          if (result.success && result.content) {
            fileContents[keyFile] = result.content;
          }
        }
      }

      // Detect project type and tech stack
      const detectTechStack = () => {
        const stack: string[] = [];
        const extensions = projectAnalysis.filesByExtension;

        // Check package.json for dependencies
        if (fileContents["package.json"]) {
          try {
            const pkg = JSON.parse(fileContents["package.json"]);
            if (pkg.dependencies?.react || pkg.dependencies?.["react-dom"])
              stack.push("React");
            if (pkg.dependencies?.next) stack.push("Next.js");
            if (pkg.dependencies?.vue) stack.push("Vue");
            if (pkg.dependencies?.angular) stack.push("Angular");
            if (pkg.dependencies?.express) stack.push("Express");
            if (pkg.dependencies?.electron) stack.push("Electron");
            if (pkg.devDependencies?.typescript || pkg.dependencies?.typescript)
              stack.push("TypeScript");
            if (
              pkg.devDependencies?.tailwindcss ||
              pkg.dependencies?.tailwindcss
            )
              stack.push("Tailwind CSS");
            if (pkg.devDependencies?.playwright || pkg.dependencies?.playwright)
              stack.push("Playwright");
            if (pkg.devDependencies?.jest || pkg.dependencies?.jest)
              stack.push("Jest");
          } catch {
            // Ignore JSON parse errors
          }
        }

        // Detect by file extensions
        if (extensions["ts"] || extensions["tsx"]) stack.push("TypeScript");
        if (extensions["py"]) stack.push("Python");
        if (extensions["go"]) stack.push("Go");
        if (extensions["rs"]) stack.push("Rust");
        if (extensions["java"]) stack.push("Java");
        if (extensions["css"] || extensions["scss"] || extensions["sass"])
          stack.push("CSS/SCSS");

        // Remove duplicates
        return [...new Set(stack)];
      };

      // Get project name from package.json or folder name
      const getProjectName = () => {
        if (fileContents["package.json"]) {
          try {
            const pkg = JSON.parse(fileContents["package.json"]);
            if (pkg.name) return pkg.name;
          } catch {
            // Ignore JSON parse errors
          }
        }
        // Fall back to folder name
        return currentProject.name;
      };

      // Get project description from package.json or README
      const getProjectDescription = () => {
        if (fileContents["package.json"]) {
          try {
            const pkg = JSON.parse(fileContents["package.json"]);
            if (pkg.description) return pkg.description;
          } catch {
            // Ignore JSON parse errors
          }
        }
        if (fileContents["README.md"]) {
          // Extract first paragraph from README
          const lines = fileContents["README.md"].split("\n");
          for (const line of lines) {
            const trimmed = line.trim();
            if (
              trimmed &&
              !trimmed.startsWith("#") &&
              !trimmed.startsWith("!") &&
              trimmed.length > 20
            ) {
              return trimmed.substring(0, 200);
            }
          }
        }
        return "A software project";
      };

      // Group files by directory for structure analysis
      const analyzeStructure = () => {
        const structure: string[] = [];
        const topLevelDirs = projectAnalysis.fileTree
          .filter((n: FileTreeNode) => n.isDirectory)
          .map((n: FileTreeNode) => n.name);

        for (const dir of topLevelDirs) {
          structure.push(`      <directory name="${dir}" />`);
        }
        return structure.join("\n");
      };

      const projectName = getProjectName();
      const description = getProjectDescription();
      const techStack = detectTechStack();

      // Generate the spec content
      const specContent = `<project_specification>
  <project_name>${projectName}</project_name>

  <overview>
    ${description}
  </overview>

  <technology_stack>
    <languages>
${Object.entries(projectAnalysis.filesByExtension)
  .filter(([ext]: [string, number]) =>
    ["ts", "tsx", "js", "jsx", "py", "go", "rs", "java", "cpp", "c"].includes(
      ext
    )
  )
  .sort((a: [string, number], b: [string, number]) => b[1] - a[1])
  .slice(0, 5)
  .map(
    ([ext, count]: [string, number]) =>
      `      <language ext=".${ext}" count="${count}" />`
  )
  .join("\n")}
    </languages>
    <frameworks>
${techStack.map((tech) => `      <framework>${tech}</framework>`).join("\n")}
    </frameworks>
  </technology_stack>

  <project_structure>
    <total_files>${projectAnalysis.totalFiles}</total_files>
    <total_directories>${projectAnalysis.totalDirectories}</total_directories>
    <top_level_structure>
${analyzeStructure()}
    </top_level_structure>
  </project_structure>

  <file_breakdown>
${Object.entries(projectAnalysis.filesByExtension)
  .sort((a: [string, number], b: [string, number]) => b[1] - a[1])
  .slice(0, 10)
  .map(
    ([ext, count]: [string, number]) =>
      `    <extension type="${
        ext.startsWith("(") ? ext : "." + ext
      }" count="${count}" />`
  )
  .join("\n")}
  </file_breakdown>

  <analyzed_at>${projectAnalysis.analyzedAt}</analyzed_at>
</project_specification>
`;

      // Write the spec file
      const specPath = `${currentProject.path}/.automaker/app_spec.txt`;
      const writeResult = await api.writeFile(specPath, specContent);

      if (writeResult.success) {
        setSpecGenerated(true);
      } else {
        setSpecError(writeResult.error || "Failed to write spec file");
      }
    } catch (error) {
      console.error("Failed to generate spec:", error);
      setSpecError(
        error instanceof Error ? error.message : "Failed to generate spec"
      );
    } finally {
      setIsGeneratingSpec(false);
    }
  }, [currentProject, projectAnalysis]);

  // Generate features from analysis and save to .automaker/features folder
  const generateFeatureList = useCallback(async () => {
    if (!currentProject || !projectAnalysis) return;

    setIsGeneratingFeatureList(true);
    setFeatureListError(null);
    setFeatureListGenerated(false);

    try {
      const api = getElectronAPI();

      // Read key files to understand the project
      const fileContents: Record<string, string> = {};
      const keyFiles = ["package.json", "README.md"];

      // Try to read key configuration files
      for (const keyFile of keyFiles) {
        const filePath = `${currentProject.path}/${keyFile}`;
        const exists = await api.exists(filePath);
        if (exists) {
          const result = await api.readFile(filePath);
          if (result.success && result.content) {
            fileContents[keyFile] = result.content;
          }
        }
      }

      // Collect file paths from analysis
      const collectFilePaths = (nodes: FileTreeNode[]): string[] => {
        const paths: string[] = [];
        for (const node of nodes) {
          if (!node.isDirectory) {
            paths.push(node.path);
          } else if (node.children) {
            paths.push(...collectFilePaths(node.children));
          }
        }
        return paths;
      };

      const allFilePaths = collectFilePaths(projectAnalysis.fileTree);

      // Analyze directories and files to detect features
      interface DetectedFeature {
        category: string;
        description: string;
        steps: string[];
        passes: boolean;
      }

      const detectedFeatures: DetectedFeature[] = [];

      // Detect features based on project structure and files
      const detectFeatures = () => {
        const extensions = projectAnalysis.filesByExtension;
        const topLevelDirs = projectAnalysis.fileTree
          .filter((n: FileTreeNode) => n.isDirectory)
          .map((n: FileTreeNode) => n.name.toLowerCase());
        const topLevelFiles = projectAnalysis.fileTree
          .filter((n: FileTreeNode) => !n.isDirectory)
          .map((n: FileTreeNode) => n.name.toLowerCase());

        // Check for test directories and files
        const hasTests =
          topLevelDirs.includes("tests") ||
          topLevelDirs.includes("test") ||
          topLevelDirs.includes("__tests__") ||
          allFilePaths.some(
            (p) => p.includes(".spec.") || p.includes(".test.")
          );

        if (hasTests) {
          detectedFeatures.push({
            category: "Testing",
            description: "Automated test suite",
            steps: [
              "Step 1: Tests directory exists",
              "Step 2: Test files are present",
              "Step 3: Run test suite",
            ],
            passes: true,
          });
        }

        // Check for components directory (UI components)
        const hasComponents =
          topLevelDirs.includes("components") ||
          allFilePaths.some((p) => p.toLowerCase().includes("/components/"));

        if (hasComponents) {
          detectedFeatures.push({
            category: "UI/Design",
            description: "Component-based UI architecture",
            steps: [
              "Step 1: Components directory exists",
              "Step 2: UI components are defined",
              "Step 3: Components are reusable",
            ],
            passes: true,
          });
        }

        // Check for src directory (organized source code)
        if (topLevelDirs.includes("src")) {
          detectedFeatures.push({
            category: "Project Structure",
            description: "Organized source code structure",
            steps: [
              "Step 1: Source directory exists",
              "Step 2: Code is properly organized",
              "Step 3: Follows best practices",
            ],
            passes: true,
          });
        }

        // Check package.json for dependencies and detect features
        if (fileContents["package.json"]) {
          try {
            const pkg = JSON.parse(fileContents["package.json"]);

            // React/Next.js app detection
            if (pkg.dependencies?.react || pkg.dependencies?.["react-dom"]) {
              detectedFeatures.push({
                category: "Frontend",
                description: "React-based user interface",
                steps: [
                  "Step 1: React is installed",
                  "Step 2: Components render correctly",
                  "Step 3: State management works",
                ],
                passes: true,
              });
            }

            if (pkg.dependencies?.next) {
              detectedFeatures.push({
                category: "Framework",
                description: "Next.js framework integration",
                steps: [
                  "Step 1: Next.js is configured",
                  "Step 2: Pages/routes are defined",
                  "Step 3: Server-side rendering works",
                ],
                passes: true,
              });
            }

            // TypeScript support
            if (
              pkg.devDependencies?.typescript ||
              pkg.dependencies?.typescript ||
              extensions["ts"] ||
              extensions["tsx"]
            ) {
              detectedFeatures.push({
                category: "Developer Experience",
                description: "TypeScript type safety",
                steps: [
                  "Step 1: TypeScript is configured",
                  "Step 2: Type definitions exist",
                  "Step 3: Code compiles without errors",
                ],
                passes: true,
              });
            }

            // Tailwind CSS
            if (
              pkg.devDependencies?.tailwindcss ||
              pkg.dependencies?.tailwindcss
            ) {
              detectedFeatures.push({
                category: "UI/Design",
                description: "Tailwind CSS styling",
                steps: [
                  "Step 1: Tailwind is configured",
                  "Step 2: Styles are applied",
                  "Step 3: Responsive design works",
                ],
                passes: true,
              });
            }

            // ESLint/Prettier (code quality)
            if (pkg.devDependencies?.eslint || pkg.devDependencies?.prettier) {
              detectedFeatures.push({
                category: "Developer Experience",
                description: "Code quality tools",
                steps: [
                  "Step 1: Linter is configured",
                  "Step 2: Code passes lint checks",
                  "Step 3: Formatting is consistent",
                ],
                passes: true,
              });
            }

            // Electron (desktop app)
            if (pkg.dependencies?.electron || pkg.devDependencies?.electron) {
              detectedFeatures.push({
                category: "Platform",
                description: "Electron desktop application",
                steps: [
                  "Step 1: Electron is configured",
                  "Step 2: Main process runs",
                  "Step 3: Renderer process loads",
                ],
                passes: true,
              });
            }

            // Playwright testing
            if (
              pkg.devDependencies?.playwright ||
              pkg.devDependencies?.["@playwright/test"]
            ) {
              detectedFeatures.push({
                category: "Testing",
                description: "Playwright end-to-end testing",
                steps: [
                  "Step 1: Playwright is configured",
                  "Step 2: E2E tests are defined",
                  "Step 3: Tests pass successfully",
                ],
                passes: true,
              });
            }
          } catch {
            // Ignore JSON parse errors
          }
        }

        // Check for documentation
        if (
          topLevelFiles.includes("readme.md") ||
          topLevelDirs.includes("docs")
        ) {
          detectedFeatures.push({
            category: "Documentation",
            description: "Project documentation",
            steps: [
              "Step 1: README exists",
              "Step 2: Documentation is comprehensive",
              "Step 3: Setup instructions are clear",
            ],
            passes: true,
          });
        }

        // Check for CI/CD configuration
        const hasCICD =
          topLevelDirs.includes(".github") ||
          topLevelFiles.includes(".gitlab-ci.yml") ||
          topLevelFiles.includes(".travis.yml");

        if (hasCICD) {
          detectedFeatures.push({
            category: "DevOps",
            description: "CI/CD pipeline configuration",
            steps: [
              "Step 1: CI config exists",
              "Step 2: Pipeline runs on push",
              "Step 3: Automated checks pass",
            ],
            passes: true,
          });
        }

        // Check for API routes (Next.js API or Express)
        const hasAPIRoutes = allFilePaths.some(
          (p) =>
            p.includes("/api/") ||
            p.includes("/routes/") ||
            p.includes("/endpoints/")
        );

        if (hasAPIRoutes) {
          detectedFeatures.push({
            category: "Backend",
            description: "API endpoints",
            steps: [
              "Step 1: API routes are defined",
              "Step 2: Endpoints respond correctly",
              "Step 3: Error handling is implemented",
            ],
            passes: true,
          });
        }

        // Check for state management
        const hasStateManagement = allFilePaths.some(
          (p) =>
            p.includes("/store/") ||
            p.includes("/stores/") ||
            p.includes("/redux/") ||
            p.includes("/context/")
        );

        if (hasStateManagement) {
          detectedFeatures.push({
            category: "Architecture",
            description: "State management system",
            steps: [
              "Step 1: Store is configured",
              "Step 2: State updates correctly",
              "Step 3: Components access state",
            ],
            passes: true,
          });
        }

        // Check for configuration files
        if (
          topLevelFiles.includes("tsconfig.json") ||
          topLevelFiles.includes("package.json")
        ) {
          detectedFeatures.push({
            category: "Configuration",
            description: "Project configuration files",
            steps: [
              "Step 1: Config files exist",
              "Step 2: Configuration is valid",
              "Step 3: Build process works",
            ],
            passes: true,
          });
        }
      };

      detectFeatures();

      // If no features were detected, add a default feature
      if (detectedFeatures.length === 0) {
        detectedFeatures.push({
          category: "Core",
          description: "Basic project structure",
          steps: [
            "Step 1: Project directory exists",
            "Step 2: Files are present",
            "Step 3: Project can be loaded",
          ],
          passes: true,
        });
      }

      // Create each feature using the features API
      if (!api.features) {
        throw new Error("Features API not available");
      }

      for (const detectedFeature of detectedFeatures) {
        await api.features.create(currentProject.path, {
          id: crypto.randomUUID(),
          category: detectedFeature.category,
          description: detectedFeature.description,
          steps: detectedFeature.steps,
          status: "backlog",
        });
      }

      setFeatureListGenerated(true);
    } catch (error) {
      console.error("Failed to generate feature list:", error);
      setFeatureListError(
        error instanceof Error
          ? error.message
          : "Failed to generate feature list"
      );
    } finally {
      setIsGeneratingFeatureList(false);
    }
  }, [currentProject, projectAnalysis]);

  // Toggle folder expansion
  const toggleFolder = (path: string) => {
    const newExpanded = new Set(expandedFolders);
    if (expandedFolders.has(path)) {
      newExpanded.delete(path);
    } else {
      newExpanded.add(path);
    }
    setExpandedFolders(newExpanded);
  };

  // Render file tree node
  const renderNode = (node: FileTreeNode, depth: number = 0) => {
    const isExpanded = expandedFolders.has(node.path);

    return (
      <div key={node.path} data-testid={`analysis-node-${node.name}`}>
        <div
          className={cn(
            "flex items-center gap-2 py-1 px-2 rounded cursor-pointer hover:bg-muted/50 text-sm"
          )}
          style={{ paddingLeft: `${depth * 16 + 8}px` }}
          onClick={() => {
            if (node.isDirectory) {
              toggleFolder(node.path);
            }
          }}
        >
          {node.isDirectory ? (
            <>
              {isExpanded ? (
                <ChevronDown className="w-4 h-4 text-muted-foreground shrink-0" />
              ) : (
                <ChevronRight className="w-4 h-4 text-muted-foreground shrink-0" />
              )}
              {isExpanded ? (
                <FolderOpen className="w-4 h-4 text-primary shrink-0" />
              ) : (
                <Folder className="w-4 h-4 text-primary shrink-0" />
              )}
            </>
          ) : (
            <>
              <span className="w-4" />
              <File className="w-4 h-4 text-muted-foreground shrink-0" />
            </>
          )}
          <span className="truncate">{node.name}</span>
          {node.extension && (
            <span className="text-xs text-muted-foreground ml-auto">
              .{node.extension}
            </span>
          )}
        </div>
        {node.isDirectory && isExpanded && node.children && (
          <div>
            {node.children.map((child: FileTreeNode) =>
              renderNode(child, depth + 1)
            )}
          </div>
        )}
      </div>
    );
  };

  if (!currentProject) {
    return (
      <div
        className="flex-1 flex items-center justify-center"
        data-testid="analysis-view-no-project"
      >
        <p className="text-muted-foreground">No project selected</p>
      </div>
    );
  }

  return (
    <div
      className="flex-1 flex flex-col overflow-hidden content-bg"
      data-testid="analysis-view"
    >
      {/* Header */}
      <div className="flex items-center justify-between p-4 border-b border-white/10 bg-zinc-950/50 backdrop-blur-md">
        <div className="flex items-center gap-3">
          <Search className="w-5 h-5 text-muted-foreground" />
          <div>
            <h1 className="text-xl font-bold">Project Analysis</h1>
            <p className="text-sm text-muted-foreground">
              {currentProject.name}
            </p>
          </div>
        </div>
        <Button
          onClick={runAnalysis}
          disabled={isAnalyzing}
          data-testid="analyze-project-button"
        >
          {isAnalyzing ? (
            <>
              <Loader2 className="w-4 h-4 mr-2 animate-spin" />
              Analyzing...
            </>
          ) : (
            <>
              <RefreshCw className="w-4 h-4 mr-2" />
              Analyze Project
            </>
          )}
        </Button>
      </div>

      {/* Content */}
      <div className="flex-1 overflow-hidden p-4">
        {!projectAnalysis && !isAnalyzing ? (
          <div className="flex flex-col items-center justify-center h-full text-center">
            <Search className="w-16 h-16 text-muted-foreground/50 mb-4" />
            <h2 className="text-lg font-semibold mb-2">No Analysis Yet</h2>
            <p className="text-sm text-muted-foreground mb-4 max-w-md">
              Click &quot;Analyze Project&quot; to scan your codebase and get
              insights about its structure.
            </p>
            <Button
              onClick={runAnalysis}
              data-testid="analyze-project-button-empty"
            >
              <Search className="w-4 h-4 mr-2" />
              Start Analysis
            </Button>
          </div>
        ) : isAnalyzing ? (
          <div className="flex flex-col items-center justify-center h-full">
            <Loader2 className="w-12 h-12 animate-spin text-primary mb-4" />
            <p className="text-muted-foreground">Scanning project files...</p>
          </div>
        ) : projectAnalysis ? (
          <div className="flex gap-4 h-full overflow-hidden">
            {/* Stats Panel */}
            <div className="w-80 shrink-0 overflow-y-auto space-y-4">
              <Card data-testid="analysis-stats">
                <CardHeader className="pb-2">
                  <CardTitle className="text-sm flex items-center gap-2">
                    <BarChart3 className="w-4 h-4" />
                    Statistics
                  </CardTitle>
                  <CardDescription>
                    Analyzed{" "}
                    {new Date(projectAnalysis.analyzedAt).toLocaleString()}
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-3">
                  <div className="flex justify-between">
                    <span className="text-sm text-muted-foreground">
                      Total Files
                    </span>
                    <span className="font-medium" data-testid="total-files">
                      {projectAnalysis.totalFiles}
                    </span>
                  </div>
                  <div className="flex justify-between">
                    <span className="text-sm text-muted-foreground">
                      Total Directories
                    </span>
                    <span
                      className="font-medium"
                      data-testid="total-directories"
                    >
                      {projectAnalysis.totalDirectories}
                    </span>
                  </div>
                </CardContent>
              </Card>

              <Card data-testid="files-by-extension">
                <CardHeader className="pb-2">
                  <CardTitle className="text-sm flex items-center gap-2">
                    <FileCode className="w-4 h-4" />
                    Files by Extension
                  </CardTitle>
                </CardHeader>
                <CardContent>
                  <div className="space-y-2">
                    {Object.entries(projectAnalysis.filesByExtension)
                      .sort(
                        (a: [string, number], b: [string, number]) =>
                          b[1] - a[1]
                      )
                      .slice(0, 15)
                      .map(([ext, count]: [string, number]) => (
                        <div key={ext} className="flex justify-between text-sm">
                          <span className="text-muted-foreground font-mono">
                            {ext.startsWith("(") ? ext : `.${ext}`}
                          </span>
                          <span>{count}</span>
                        </div>
                      ))}
                  </div>
                </CardContent>
              </Card>

              {/* Generate Spec Card */}
              <Card data-testid="generate-spec-card">
                <CardHeader className="pb-2">
                  <CardTitle className="text-sm flex items-center gap-2">
                    <FileText className="w-4 h-4" />
                    Generate Specification
                  </CardTitle>
                  <CardDescription>
                    Create app_spec.txt from analysis
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-3">
                  <p className="text-sm text-muted-foreground">
                    Generate a project specification file based on the analyzed
                    codebase structure and detected technologies.
                  </p>
                  <Button
                    onClick={generateSpec}
                    disabled={isGeneratingSpec}
                    className="w-full"
                    data-testid="generate-spec-button"
                  >
                    {isGeneratingSpec ? (
                      <>
                        <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                        Generating...
                      </>
                    ) : (
                      <>
                        <FileText className="w-4 h-4 mr-2" />
                        Generate Spec
                      </>
                    )}
                  </Button>
                  {specGenerated && (
                    <div
                      className="flex items-center gap-2 text-sm text-green-500"
                      data-testid="spec-generated-success"
                    >
                      <CheckCircle className="w-4 h-4" />
                      <span>app_spec.txt created successfully!</span>
                    </div>
                  )}
                  {specError && (
                    <div
                      className="flex items-center gap-2 text-sm text-red-500"
                      data-testid="spec-generated-error"
                    >
                      <AlertCircle className="w-4 h-4" />
                      <span>{specError}</span>
                    </div>
                  )}
                </CardContent>
              </Card>

              {/* Generate Feature List Card */}
              <Card data-testid="generate-feature-list-card">
                <CardHeader className="pb-2">
                  <CardTitle className="text-sm flex items-center gap-2">
                    <ListChecks className="w-4 h-4" />
                    Generate Feature List
                  </CardTitle>
                  <CardDescription>
                    Create features from analysis
                  </CardDescription>
                </CardHeader>
                <CardContent className="space-y-3">
                  <p className="text-sm text-muted-foreground">
                    Automatically detect and generate a feature list based on
                    the analyzed codebase structure, dependencies, and project
                    configuration.
                  </p>
                  <Button
                    onClick={generateFeatureList}
                    disabled={isGeneratingFeatureList}
                    className="w-full"
                    data-testid="generate-feature-list-button"
                  >
                    {isGeneratingFeatureList ? (
                      <>
                        <Loader2 className="w-4 h-4 mr-2 animate-spin" />
                        Generating...
                      </>
                    ) : (
                      <>
                        <ListChecks className="w-4 h-4 mr-2" />
                        Generate Feature List
                      </>
                    )}
                  </Button>
                  {featureListGenerated && (
                    <div
                      className="flex items-center gap-2 text-sm text-green-500"
                      data-testid="feature-list-generated-success"
                    >
                      <CheckCircle className="w-4 h-4" />
                      <span>Features created successfully!</span>
                    </div>
                  )}
                  {featureListError && (
                    <div
                      className="flex items-center gap-2 text-sm text-red-500"
                      data-testid="feature-list-generated-error"
                    >
                      <AlertCircle className="w-4 h-4" />
                      <span>{featureListError}</span>
                    </div>
                  )}
                </CardContent>
              </Card>
            </div>

            {/* File Tree */}
            <Card className="flex-1 overflow-hidden">
              <CardHeader className="pb-2 border-b">
                <CardTitle className="text-sm flex items-center gap-2">
                  <Folder className="w-4 h-4" />
                  File Tree
                </CardTitle>
                <CardDescription>
                  {projectAnalysis.totalFiles} files in{" "}
                  {projectAnalysis.totalDirectories} directories
                </CardDescription>
              </CardHeader>
              <CardContent
                className="p-0 overflow-y-auto h-full"
                data-testid="analysis-file-tree"
              >
                <div className="p-2">
                  {projectAnalysis.fileTree.map((node: FileTreeNode) =>
                    renderNode(node)
                  )}
                </div>
              </CardContent>
            </Card>
          </div>
        ) : null}
      </div>
    </div>
  );
}