import { DiagramType, DiagramFormat, DiagramData } from '../types/diagram-types.js';
import { convertToDrawioXML, createDiagramFile, getDefaultStyle, generateId } from '../utils/drawio-converter.js';
import { analyzeDiagramDescription } from '../ai/diagram-analyzer.js';
import { generateSmartBPMNDiagram } from '../generators/smart-bpmn-generator.js';
import { generateSmartERDiagram } from '../generators/smart-er-generator.js';
import { generateSmartArchitectureDiagram } from '../generators/smart-architecture-generator.js';
import * as fs from 'fs';
import * as path from 'path';

// Functional types
type CreateDiagramInput = Readonly<{
  name: string;
  type: DiagramType;
  format?: DiagramFormat;
  description?: string;
  outputPath?: string;
  workspaceRoot?: string;
  complexity?: 'simple' | 'detailed';
  language?: string;
  // Legacy parameters for backward compatibility
  tasks?: readonly string[];
  entities?: readonly string[];
  classes?: readonly string[];
  components?: readonly string[];
  processes?: readonly string[];
  processName?: string;
  gatewayType?: 'exclusive' | 'parallel';
  branches?: readonly (readonly string[])[];
  beforeGateway?: readonly string[];
  afterGateway?: readonly string[];
}>;

type CreateDiagramResult = Readonly<{
  success: boolean;
  filePath?: string;
  content?: string;
  message: string;
  diagramType: DiagramType;
  format: DiagramFormat;
}>;

// Pure function to create successful result
const createSuccessResult = (
  filePath: string,
  content: string,
  diagramType: DiagramType,
  format: DiagramFormat,
  name: string
): CreateDiagramResult => ({
  success: true,
  filePath,
  content,
  message: `Successfully created ${diagramType} diagram: ${name}`,
  diagramType,
  format
});

// Pure function to create error result
const createErrorResult = (
  error: unknown,
  diagramType: DiagramType,
  format: DiagramFormat
): CreateDiagramResult => ({
  success: false,
  message: `Failed to create diagram: ${error instanceof Error ? error.message : String(error)}`,
  diagramType,
  format
});

// Pure function to ensure directory exists
const ensureDirectoryExists = (dirPath: string): void => {
  if (!fs.existsSync(dirPath)) {
    fs.mkdirSync(dirPath, { recursive: true });
  }
};

// Pure function to write file
const writeFile = async (filePath: string, content: string): Promise<void> => {
  const dir = path.dirname(filePath);
  ensureDirectoryExists(dir);
  await fs.promises.writeFile(filePath, content, 'utf8');
};

// Pure function to generate diagram using AI
const generateAIDiagram = async (input: CreateDiagramInput): Promise<DiagramData> => {
  if (!input.description) {
    throw new Error('Description is required for AI-powered diagram generation');
  }

  // Analyze the description
  const analysis = await analyzeDiagramDescription(input.description);
  
  // Generate diagram based on type
  const preferences = {
    complexity: input.complexity || 'detailed',
    language: input.language || 'es'
  };

  switch (input.type) {
    case DiagramType.BPMN_PROCESS:
    case DiagramType.BPMN_COLLABORATION:
    case DiagramType.BPMN_CHOREOGRAPHY:
      return generateSmartBPMNDiagram(input.description, analysis, preferences);
    
    case DiagramType.ER_DIAGRAM:
    case DiagramType.DATABASE_SCHEMA:
    case DiagramType.CONCEPTUAL_MODEL:
      return generateSmartERDiagram(input.description, analysis, preferences);
    
    case DiagramType.SYSTEM_ARCHITECTURE:
    case DiagramType.MICROSERVICES:
    case DiagramType.LAYERED_ARCHITECTURE:
    case DiagramType.C4_CONTEXT:
    case DiagramType.C4_CONTAINER:
    case DiagramType.C4_COMPONENT:
    case DiagramType.CLOUD_ARCHITECTURE:
    case DiagramType.INFRASTRUCTURE:
      return generateSmartArchitectureDiagram(input.description, analysis, preferences);
    
    default:
      // Fallback to basic diagram generation
      return generateBasicDiagram(input);
  }
};

// Pure function to generate basic diagram (fallback)
const generateBasicDiagram = (input: CreateDiagramInput): DiagramData => {
  return {
    elements: [{
      id: 'basic-1',
      type: 'rectangle',
      label: input.name,
      geometry: {
        x: 100,
        y: 100,
        width: 200,
        height: 100
      },
      style: 'rounded=0;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;',
      properties: {}
    }],
    connections: [],
    metadata: {
      type: input.type,
      format: input.format || DiagramFormat.DRAWIO,
      created: new Date().toISOString(),
      modified: new Date().toISOString(),
      version: '1.0'
    }
  };
};

// Pure function to generate legacy diagram (for backward compatibility)
const generateLegacyDiagram = (input: CreateDiagramInput): DiagramData => {
  const elements: any[] = [];
  const connections: any[] = [];

  // Handle legacy parameters
  if (input.tasks && input.tasks.length > 0) {
    // Generate BPMN-like diagram from tasks
    input.tasks.forEach((task, index) => {
      elements.push({
        id: `task-${index}`,
        type: 'bpmn-task',
        label: task,
        geometry: {
          x: 100,
          y: 100 + (index * 120),
          width: 120,
          height: 80
        },
        style: 'rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;',
        properties: { isTask: true }
      });

      if (index > 0) {
        connections.push({
          id: `conn-${index}`,
          source: `task-${index - 1}`,
          target: `task-${index}`,
          label: '',
          style: 'edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;endArrow=classic;',
          properties: {}
        });
      }
    });
  } else if (input.entities && input.entities.length > 0) {
    // Generate ER diagram from entities
    input.entities.forEach((entity, index) => {
      elements.push({
        id: `entity-${index}`,
        type: 'er-entity',
        label: entity,
        geometry: {
          x: 100 + (index * 200),
          y: 100,
          width: 120,
          height: 80
        },
        style: 'whiteSpace=wrap;html=1;align=center;fillColor=#e1d5e7;strokeColor=#9673a6;',
        properties: { isEntity: true }
      });
    });
  } else if (input.classes && input.classes.length > 0) {
    // Generate UML class diagram from classes
    input.classes.forEach((className, index) => {
      elements.push({
        id: `class-${index}`,
        type: 'uml-class',
        label: className,
        geometry: {
          x: 100 + (index * 200),
          y: 100,
          width: 160,
          height: 120
        },
        style: 'swimlane;fontStyle=1;align=center;verticalAlign=top;childLayout=stackLayout;horizontal=1;startSize=26;fillColor=#dae8fc;strokeColor=#6c8ebf;',
        properties: { isClass: true }
      });
    });
  } else if (input.components && input.components.length > 0) {
    // Generate architecture diagram from components
    input.components.forEach((component, index) => {
      elements.push({
        id: `comp-${index}`,
        type: 'architecture-component',
        label: component,
        geometry: {
          x: 100 + (index % 2) * 300,
          y: 100 + Math.floor(index / 2) * 150,
          width: 200,
          height: 100
        },
        style: 'rounded=1;whiteSpace=wrap;html=1;fillColor=#dae8fc;strokeColor=#6c8ebf;',
        properties: { isComponent: true }
      });
    });
  } else {
    // Fallback to basic diagram
    return generateBasicDiagram(input);
  }

  return {
    elements,
    connections,
    metadata: {
      type: input.type,
      format: input.format || DiagramFormat.DRAWIO,
      created: new Date().toISOString(),
      modified: new Date().toISOString(),
      version: '1.0'
    }
  };
};

// Main function to create a new diagram
export const createDiagram = async (input: CreateDiagramInput): Promise<CreateDiagramResult> => {
  try {
    const format = input.format || DiagramFormat.DRAWIO;
    const workspaceRoot = input.workspaceRoot || process.cwd();
    
    // Generate diagram data
    let diagramData: DiagramData;
    
    if (input.description) {
      // Use AI-powered generation
      diagramData = await generateAIDiagram(input);
    } else {
      // Use legacy generation for backward compatibility
      diagramData = generateLegacyDiagram(input);
    }
    
    // Convert to the requested format
    const { content, filename } = createDiagramFile(diagramData, format, input.name);
    
    // Determine output path
    const outputDir = input.outputPath 
      ? path.resolve(workspaceRoot, input.outputPath)
      : workspaceRoot;
    
    const filePath = path.join(outputDir, filename);
    
    // Write file
    await writeFile(filePath, content);

    return createSuccessResult(filePath, content, input.type, format, input.name);
  } catch (error) {
    console.error('Error creating diagram:', error);
    return createErrorResult(error, input.type, input.format || DiagramFormat.DRAWIO);
  }
};

// Pure function to validate create diagram input
export const validateCreateDiagramInput = (input: any): input is CreateDiagramInput => {
  return (
    typeof input === 'object' &&
    input !== null &&
    typeof input.name === 'string' &&
    Object.values(DiagramType).includes(input.type)
  );
};

// Pure function to get supported diagram types
export const getSupportedDiagramTypes = (): readonly DiagramType[] => {
  return Object.values(DiagramType);
};

// Pure function to get diagram type descriptions
const getDiagramTypeDescriptions = (): Readonly<Record<DiagramType, string>> => ({
  [DiagramType.BPMN_PROCESS]: 'Business Process Model and Notation diagram for modeling business processes with AI-powered generation',
  [DiagramType.BPMN_COLLABORATION]: 'BPMN collaboration diagram showing interactions between participants',
  [DiagramType.BPMN_CHOREOGRAPHY]: 'BPMN choreography diagram for modeling message exchanges',
  [DiagramType.UML_CLASS]: 'UML Class diagram showing classes, attributes, methods, and relationships',
  [DiagramType.UML_SEQUENCE]: 'UML Sequence diagram showing object interactions over time',
  [DiagramType.UML_USE_CASE]: 'UML Use Case diagram showing system functionality and user interactions',
  [DiagramType.UML_ACTIVITY]: 'UML Activity diagram showing workflow and business processes',
  [DiagramType.UML_STATE]: 'UML State diagram showing object states and transitions',
  [DiagramType.UML_COMPONENT]: 'UML Component diagram showing software components and dependencies',
  [DiagramType.UML_DEPLOYMENT]: 'UML Deployment diagram showing hardware and software deployment',
  [DiagramType.ER_DIAGRAM]: 'Entity-Relationship diagram for database design with AI-powered generation',
  [DiagramType.DATABASE_SCHEMA]: 'Database schema diagram showing tables and relationships',
  [DiagramType.CONCEPTUAL_MODEL]: 'Conceptual data model diagram',
  [DiagramType.NETWORK_TOPOLOGY]: 'Network topology diagram showing network infrastructure',
  [DiagramType.INFRASTRUCTURE]: 'Infrastructure diagram showing system components',
  [DiagramType.CLOUD_ARCHITECTURE]: 'Cloud architecture diagram showing cloud services and components',
  [DiagramType.SYSTEM_ARCHITECTURE]: 'System architecture diagram showing high-level system design with AI-powered generation',
  [DiagramType.MICROSERVICES]: 'Microservices architecture diagram',
  [DiagramType.LAYERED_ARCHITECTURE]: 'Layered architecture diagram showing application layers',
  [DiagramType.C4_CONTEXT]: 'C4 Context diagram showing system context',
  [DiagramType.C4_CONTAINER]: 'C4 Container diagram showing application containers',
  [DiagramType.C4_COMPONENT]: 'C4 Component diagram showing component details',
  [DiagramType.FLOWCHART]: 'Flowchart diagram showing process flow',
  [DiagramType.ORGCHART]: 'Organizational chart showing hierarchy',
  [DiagramType.MINDMAP]: 'Mind map diagram for brainstorming and organizing ideas',
  [DiagramType.WIREFRAME]: 'Wireframe diagram for UI/UX design',
  [DiagramType.GANTT]: 'Gantt chart for project management and scheduling'
});

// Pure function to get description for a specific diagram type
export const getDiagramTypeDescription = (diagramType: DiagramType): string => {
  const descriptions = getDiagramTypeDescriptions();
  return descriptions[diagramType] || 'Generic diagram type';
};