import fs from 'fs';
import path from 'path';

function createIconImportProxy() {
    const packageName = '@phosphor-icons/react';
    const fallbackIcon = 'Question';
    const packagePath = 'node_modules/@phosphor-icons/react';
    // Cache to avoid redundant filesystem checks
    const existingExportsCache = new Set();
    let hasLoadedExports = false;
    const proxiedImports = new Map();
    // Function to load all available exports from the package
    const loadExports = () => {
        if (hasLoadedExports)
            return;
        try {
            const packageDir = path.resolve(packagePath);
            console.log(`[icon-proxy] Checking for exports in directory: ${packageDir}`);
            const filesToCheck = [
                path.join(packageDir, 'dist', 'index.js'),
                path.join(packageDir, 'dist', 'index.mjs'),
                path.join(packageDir, 'dist', 'index.d.ts'),
                path.join(packageDir, 'index.js'),
                path.join(packageDir, 'index.d.ts'),
            ];
            // Find the first file that exists
            const existingFile = filesToCheck.find((file) => fs.existsSync(file));
            if (existingFile) {
                console.log(`[icon-proxy] Found package file: ${existingFile}`);
                const content = fs.readFileSync(existingFile, 'utf-8');
                // Extract export names with multiple regex patterns to catch different export styles
                const exportPatterns = [
                    /export\s+\{\s*([^}]+)\s*\}/g, // export { Name1, Name2 }
                    /export\s+const\s+(\w+)/g, // export const Name
                    /export\s+function\s+(\w+)/g, // export function Name
                    /export\s+type\s+(\w+)/g, // export type Name
                    /export\s+\*\s+from\s+'.*\/csr\/(\w+)'/g, // export * from './csr/Name'
                ];
                exportPatterns.forEach((pattern) => {
                    let match;
                    while ((match = pattern.exec(content)) !== null) {
                        if (pattern.source.includes('\\{')) {
                            // Multiple exports in braces
                            const exports$1 = match[1].split(',').map((e) => {
                                const parts = e.trim().split(/\s+as\s+/);
                                return parts[parts.length - 1].trim();
                            });
                            exports$1.forEach((name) => existingExportsCache.add(name));
                        }
                        else {
                            // Single export
                            existingExportsCache.add(match[1]);
                        }
                    }
                });
                console.log(`[icon-proxy] Loaded ${existingExportsCache.size} exports from ${existingFile}`);
            }
            else {
                console.warn(`[icon-proxy] Could not find any index files for ${packageName}`);
            }
            hasLoadedExports = true;
        }
        catch (error) {
            console.error(`[icon-proxy] Error analyzing package exports:`, error);
        }
    };
    return {
        name: 'vite-icon-import-proxy',
        enforce: 'pre',
        configResolved() {
            loadExports();
        },
        transform(code, id) {
            // Skip if not a JS/TS file or is in node_modules
            if (!/\.(jsx?|tsx?)$/.test(id) || id.includes('node_modules')) {
                return null;
            }
            // Ensure exports are loaded
            if (!hasLoadedExports) {
                loadExports();
            }
            if (!existingExportsCache.has(fallbackIcon)) {
                // If we don't find the fallback icon, then there is no sense in trying to proxy icons to it.
                // It's actually more likely that the icons *do* exist than not, so we should avoid proxying anything to prevent breaking the App's icons.
                console.warn('[icon-proxy] Warning: Fallback icon not found. Not proxying any icons');
                return null;
            }
            // No need to process files that don't import from our package
            if (!code.includes(packageName)) {
                return null;
            }
            // Regular expression to find imports from the package
            // This matches both these patterns:
            // import { IconA, IconB } from '@phosphor-icons/react';
            // import { IconA as RenamedA, IconB } from '@phosphor-icons/react';
            const importRegex = new RegExp(`import\\s+{([^}]+)}\\s+from\\s+['"]${packageName}['"]`, 'g');
            let match;
            let hasChanges = false;
            let modifiedCode = code;
            // Process each import statement
            while ((match = importRegex.exec(code)) !== null) {
                // Extract the imports section { IconA, IconB as AliasB, ... }
                const importSection = match[1];
                // Split into individual imports and process each
                const imports = importSection
                    .split(',')
                    .map((item) => item.trim())
                    .filter((item) => item.length > 0);
                let newImports = [...imports];
                let needsQuestion = false;
                // Process each imported icon
                for (let i = 0; i < imports.length; i++) {
                    const importItem = imports[i];
                    // Handle aliased imports: IconName as AliasName
                    const parts = importItem.trim().split(/\s+as\s+/);
                    const iconName = parts[0].trim();
                    const aliasName = parts.length > 1 ? parts[1].trim() : iconName;
                    // Check if this icon exists in the package
                    if (!existingExportsCache.has(iconName)) {
                        console.log(`[icon-proxy] Proxying non-existent icon: ${iconName} -> ${fallbackIcon}`);
                        proxiedImports.set(iconName, fallbackIcon);
                        // Replace with Question as AliasName
                        newImports[i] = `${fallbackIcon} as ${aliasName}`;
                        needsQuestion = true;
                        hasChanges = true;
                    }
                }
                // Make sure Question is included if we need it
                if (needsQuestion && !imports.some((imp) => imp === fallbackIcon || imp.startsWith(`${fallbackIcon} `))) {
                    newImports.push(fallbackIcon);
                }
                // Construct the new import statement
                const originalImport = match[0];
                const newImport = `import { ${newImports.join(', ')} } from '${packageName}'`;
                // Replace in the code
                modifiedCode = modifiedCode.replace(originalImport, newImport);
            }
            return hasChanges ? modifiedCode : null;
        },
        // At the end of the build, report which icons were proxied
        closeBundle() {
            if (proxiedImports.size > 0) {
                console.log('\n[icon-proxy] Proxied imports:');
                proxiedImports.forEach((fallback, original) => {
                    console.log(`  - "${original}" -> "${fallback}"`);
                });
            }
        },
    };
}

export { createIconImportProxy as default };
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