import * as vscode from 'vscode';
import { LinterRule } from './LinterRule';
import { LinterContext } from '../LinterContext';

export class MetadataRule implements LinterRule {
    public checkLine(line: string, rawLine: string, lineIdx: number, ctx: LinterContext, lines: string[]): void {
        if (line.startsWith('metadata') && ctx.inBlock === 'none') {
            ctx.inModuleMetadata = true;
            ctx.hasModuleMetadata = true;
            ctx.moduleMetadataBlockLine = lineIdx;
            ctx.foundModuleMetadata.clear();
            return;
        }

        if (ctx.inModuleMetadata) {
            const config = vscode.workspace.getConfiguration('tpl');
            
            // Felder erfassen
            if (line.match(/^origin\b/)) {ctx.foundModuleMetadata.add('origin');}
            if (line.match(/^author\b/)) {ctx.foundModuleMetadata.add('author');}
            if (line.match(/^products\b/)) {ctx.foundModuleMetadata.add('products');}
            if (line.match(/^publishers\b/)) {ctx.foundModuleMetadata.add('publishers');}
            
            // Tree-Path Sonderprüfung
            if (line.match(/^tree_path\b/)) {
                ctx.foundModuleMetadata.add('tree_path');
                if (config.get<boolean>('metadata.require.treePath', true)) {
                    this.checkTreePath(line, rawLine, lineIdx, ctx, config);
                }
            }

            // Block-Ende: Pflichtfelder abgleichen
            if (line.startsWith('end metadata')) {
                ctx.inModuleMetadata = false;
                this.checkRequiredFields(ctx, config);
            }
        }
    }

    private checkTreePath(line: string, rawLine: string, lineIdx: number, ctx: LinterContext, config: vscode.WorkspaceConfiguration) {
        const minLevels = config.get<number>('metadata.treePath.minLevels', 3);
        const staticNodes = config.get<string[]>('metadata.treePath.staticNodes', ['Grafing']);
        
        // Extrahiert die Strings aus tree_path := 'A', 'B';
        const match = line.match(/tree_path\s*:=\s*(.*);/);
        if (match) {
            const paths = match[1].split(',').map(s => s.trim().replace(/^['"]|['"]$/g, ''));
            
            if (paths.length < minLevels) {
                ctx.addDiag(lineIdx, 0, rawLine.length, `Der tree_path muss mindestens ${minLevels} Ebenen haben!`, vscode.DiagnosticSeverity.Error);
            }
            
            for (let i = 0; i < staticNodes.length; i++) {
                if (paths[i] !== staticNodes[i]) {
                    ctx.addDiag(lineIdx, 0, rawLine.length, `Die tree_path Ebene ${i + 1} muss zwingend '${staticNodes[i]}' lauten!`, vscode.DiagnosticSeverity.Error);
                }
            }
        }
    }

    private checkRequiredFields(ctx: LinterContext, config: vscode.WorkspaceConfiguration) {
        const requiredFields: string[] = [];
        if (config.get<boolean>('metadata.require.origin', true)) {requiredFields.push('origin');}
        if (config.get<boolean>('metadata.require.author', true)) {requiredFields.push('author');}
        if (config.get<boolean>('metadata.require.products', true)) {requiredFields.push('products');}
        if (config.get<boolean>('metadata.require.publishers', true)) {requiredFields.push('publishers');}
        if (config.get<boolean>('metadata.require.treePath', true)) {requiredFields.push('tree_path');}

        const missing = requiredFields.filter(f => !ctx.foundModuleMetadata.has(f));
        
        if (missing.length > 0 && ctx.moduleMetadataBlockLine !== -1) {
            const diag = ctx.addDiag(ctx.moduleMetadataBlockLine, 0, 8, `Fehlende Pflicht-Metadaten (Modul-Ebene): ${missing.join(', ')}`, vscode.DiagnosticSeverity.Error);
            diag.code = 'missing_module_metadata'; 
        }
    }

    public checkEnd(lines: string[], ctx: LinterContext): void {
        // empty
    }
}