/**
 * WIA-SEMI-001: Semiconductor Design Standard
 * TypeScript SDK Implementation
 *
 * 弘益人間 (홍익인간) · Benefit All Humanity
 *
 * @version 1.0.0
 * @license Apache-2.0
 */

import {
  RTLDesign,
  DesignConfig,
  Module,
  Signal,
  Port,
  Parameter,
  Direction,
  HDL,
  VerificationConfig,
  TestBench,
  SimulationResult,
  SynthesisConfig,
  SynthesisResult,
  Netlist,
  FloorplanConfig,
  PhysicalDesignResult,
  ExportFormat,
  DesignError,
  LogLevel,
} from './types';

// ============================================================================
// RTL Design API
// ============================================================================

/**
 * Main RTL Design class
 */
export class Design {
  private config: DesignConfig;
  private modules: Map<string, Module>;
  private topModule: Module | null;
  private errors: DesignError[];

  constructor(config: DesignConfig) {
    this.config = config;
    this.modules = new Map();
    this.topModule = null;
    this.errors = [];

    this.log('info', `Design "${config.name}" created`);
  }

  /**
   * Add a module to the design
   */
  addModule(module: Module): void {
    if (this.modules.has(module.name)) {
      this.log('warning', `Module "${module.name}" already exists, overwriting`);
    }

    this.modules.set(module.name, module);

    if (!this.topModule) {
      this.topModule = module;
    }

    this.log('info', `Module "${module.name}" added to design`);
  }

  /**
   * Get a module by name
   */
  getModule(name: string): Module | undefined {
    return this.modules.get(name);
  }

  /**
   * Set the top-level module
   */
  setTopModule(name: string): void {
    const module = this.modules.get(name);
    if (!module) {
      this.log('error', `Module "${name}" not found`);
      throw new Error(`Module "${name}" not found`);
    }

    this.topModule = module;
    this.log('info', `Top module set to "${name}"`);
  }

  /**
   * Get the top-level module
   */
  getTopModule(): Module | null {
    return this.topModule;
  }

  /**
   * Get all modules
   */
  getAllModules(): Module[] {
    return Array.from(this.modules.values());
  }

  /**
   * Export design to various formats
   */
  export(format: ExportFormat): string {
    switch (format) {
      case 'verilog':
        return this.exportVerilog();
      case 'systemverilog':
        return this.exportSystemVerilog();
      case 'json':
        return this.exportJSON();
      default:
        throw new Error(`Export format "${format}" not supported`);
    }
  }

  /**
   * Export to Verilog
   */
  private exportVerilog(): string {
    if (!this.topModule) {
      throw new Error('No top module defined');
    }

    let verilog = `// Generated by WIA-SEMI-001 SDK\n`;
    verilog += `// Design: ${this.config.name}\n`;
    verilog += `// Date: ${new Date().toISOString()}\n\n`;

    this.modules.forEach((module) => {
      verilog += this.moduleToVerilog(module);
      verilog += '\n';
    });

    return verilog;
  }

  /**
   * Convert module to Verilog
   */
  private moduleToVerilog(module: Module): string {
    let code = `module ${module.name}`;

    // Parameters
    if (module.parameters.length > 0) {
      code += ' #(\n';
      code += module.parameters
        .map(
          (p, i) =>
            `  parameter ${p.name} = ${p.default_value}${
              i < module.parameters.length - 1 ? ',' : ''
            }`
        )
        .join('\n');
      code += '\n)';
    }

    // Ports
    code += '(\n';
    code += module.ports
      .map((p, i) => {
        const width = p.width > 1 ? `[${p.width - 1}:0] ` : '';
        return `  ${p.direction} wire ${width}${p.name}${
          i < module.ports.length - 1 ? ',' : ''
        }`;
      })
      .join('\n');
    code += '\n);\n\n';

    // Module body (placeholder)
    code += '  // Module implementation\n\n';

    code += 'endmodule\n';

    return code;
  }

  /**
   * Export to SystemVerilog
   */
  private exportSystemVerilog(): string {
    // Similar to Verilog but with SystemVerilog syntax
    return this.exportVerilog().replace(/wire/g, 'logic');
  }

  /**
   * Export to JSON
   */
  private exportJSON(): string {
    const designData: RTLDesign = {
      config: this.config,
      top_module: this.topModule!,
      modules: this.getAllModules(),
      metadata: {
        total_modules: this.modules.size,
        total_instances: 0, // Calculate from instances
        total_signals: this.calculateTotalSignals(),
        hierarchy_depth: this.calculateHierarchyDepth(),
      },
    };

    return JSON.stringify(designData, null, 2);
  }

  /**
   * Calculate total signals in design
   */
  private calculateTotalSignals(): number {
    let total = 0;
    this.modules.forEach((module) => {
      total += module.ports.length;
    });
    return total;
  }

  /**
   * Calculate hierarchy depth
   */
  private calculateHierarchyDepth(): number {
    // Simplified calculation
    return 1; // Would need to traverse instance hierarchy
  }

  /**
   * Log a message
   */
  private log(level: LogLevel, message: string): void {
    const error: DesignError = {
      level,
      message,
      timestamp: new Date(),
    };

    this.errors.push(error);

    if (level === 'error') {
      console.error(`[ERROR] ${message}`);
    } else if (level === 'warning') {
      console.warn(`[WARN] ${message}`);
    } else if (level === 'info') {
      console.log(`[INFO] ${message}`);
    }
  }

  /**
   * Get all logged errors
   */
  getErrors(): DesignError[] {
    return this.errors;
  }
}

// ============================================================================
// Verification API
// ============================================================================

/**
 * Verification environment
 */
export class Verification {
  private config: VerificationConfig;

  constructor(config: VerificationConfig) {
    this.config = config;
  }

  /**
   * Run simulation
   */
  async run(testbench: TestBench): Promise<SimulationResult> {
    console.log(`Running ${this.config.methodology} verification...`);

    // Simulate the verification process
    const total = 100;
    const passed = Math.floor(Math.random() * 10 + 90);
    const failed = total - passed;

    const result: SimulationResult = {
      passed: failed === 0,
      total_tests: total,
      passed_tests: passed,
      failed_tests: failed,
      coverage: {
        code_coverage: this.config.coverage.code ? 97.3 : 0,
        functional_coverage: this.config.coverage.functional ? 95.8 : 0,
        toggle_coverage: this.config.coverage.toggle ? 89.5 : 0,
        fsm_coverage: this.config.coverage.fsm ? 100 : 0,
        assertion_coverage: this.config.coverage.assertion ? 100 : 0,
      },
      simulation_time: Math.random() * 300 + 60,
    };

    if (failed > 0) {
      result.errors = [`${failed} tests failed`];
    }

    console.log(
      `Verification complete: ${passed}/${total} tests passed (${result.coverage.code_coverage}% coverage)`
    );

    return result;
  }

  /**
   * Run regression tests
   */
  async runRegression(): Promise<SimulationResult> {
    console.log('Running regression test suite...');

    // Run multiple test configurations
    const testbench: TestBench = {
      dut: this.config.design.top_module,
      clock_period: 10,
      reset_cycles: 10,
      stimulus: 'constrained_random',
    };

    return this.run(testbench);
  }
}

// ============================================================================
// Synthesis API
// ============================================================================

/**
 * Logic synthesis
 */
export class Synthesis {
  private config: SynthesisConfig;

  constructor(config: SynthesisConfig) {
    this.config = config;
  }

  /**
   * Run synthesis
   */
  async run(): Promise<SynthesisResult> {
    console.log(
      `Running synthesis for ${this.config.technology} (${this.config.optimization} optimization)...`
    );

    // Simulate synthesis process
    const area = this.estimateArea();
    const power = this.estimatePower();
    const frequency = this.estimateFrequency();

    const result: SynthesisResult = {
      netlist: this.generateNetlist(area),
      timing_report: {
        setup_slack: 0.127,
        hold_slack: 0.043,
        max_frequency: frequency,
        critical_path: {
          startpoint: 'input_reg/Q',
          endpoint: 'output_reg/D',
          delay: 1000 / frequency,
          slack: 0.127,
          path_type: 'setup',
        },
        worst_paths: [],
      },
      power_report: {
        total_power: power,
        dynamic_power: power * 0.7,
        static_power: power * 0.3,
        breakdown: {
          clock_network: power * 0.3,
          registers: power * 0.2,
          combinational: power * 0.2,
          io: power * 0.2,
          leakage: power * 0.1,
        },
      },
      area_report: {
        total_area: area,
        combinational_area: area * 0.6,
        sequential_area: area * 0.3,
        net_area: area * 0.1,
        cell_count: Math.floor(area / 10),
        breakdown: {
          logic: area * 0.4,
          registers: area * 0.3,
          buffers: area * 0.15,
          clock_gates: area * 0.1,
          other: area * 0.05,
        },
      },
      qor: {
        ppa_score: 85,
        timing_score: 90,
        power_score: 80,
        area_score: 85,
        congestion: 65,
        utilization: 70,
      },
    };

    console.log(
      `Synthesis complete: Area=${area}µm², Power=${power}mW, Freq=${frequency}MHz`
    );

    return result;
  }

  /**
   * Estimate area based on design and optimization
   */
  private estimateArea(): number {
    const baseArea = 5000;
    const optimizationFactor =
      this.config.optimization === 'area' ? 0.8 : this.config.optimization === 'power' ? 1.0 : 1.1;
    return baseArea * optimizationFactor;
  }

  /**
   * Estimate power
   */
  private estimatePower(): number {
    const basePower = 100;
    const optimizationFactor =
      this.config.optimization === 'power' ? 0.7 : this.config.optimization === 'area' ? 1.0 : 1.2;
    return basePower * optimizationFactor;
  }

  /**
   * Estimate max frequency
   */
  private estimateFrequency(): number {
    const baseFreq = this.config.constraints.clock_frequency;
    const optimizationFactor =
      this.config.optimization === 'performance'
        ? 1.3
        : this.config.optimization === 'balanced'
        ? 1.1
        : 1.0;
    return baseFreq * optimizationFactor;
  }

  /**
   * Generate netlist
   */
  private generateNetlist(area: number): Netlist {
    return {
      design_name: this.config.design.config.name,
      technology: this.config.technology,
      modules: [
        {
          name: this.config.design.top_module.name,
          cells: [],
          nets: [],
        },
      ],
      metadata: {
        total_cells: Math.floor(area / 10),
        total_nets: Math.floor(area / 8),
        area,
        power: this.estimatePower(),
        max_frequency: this.estimateFrequency(),
        timing_met: true,
      },
    };
  }

  /**
   * Get timing report
   */
  getTimingReport(): string {
    return `Timing Report
━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Setup Slack: +0.127 ns (MET)
Hold Slack: +0.043 ns (MET)
Max Frequency: ${this.estimateFrequency()} MHz

Critical Path:
  input_reg/Q → combinational_logic → output_reg/D
  Delay: ${(1000 / this.estimateFrequency()).toFixed(3)} ns
`;
  }
}

// ============================================================================
// Physical Design API
// ============================================================================

/**
 * Physical design implementation
 */
export class PhysicalDesign {
  private floorplanConfig: FloorplanConfig;

  constructor(floorplanConfig: FloorplanConfig) {
    this.floorplanConfig = floorplanConfig;
  }

  /**
   * Run complete physical design flow
   */
  async run(): Promise<PhysicalDesignResult> {
    console.log('Running physical design flow...');

    const result: PhysicalDesignResult = {
      floorplan: {
        die_area: this.floorplanConfig.die_width * this.floorplanConfig.die_height,
        core_area:
          this.floorplanConfig.die_width *
          this.floorplanConfig.die_height *
          this.floorplanConfig.core_utilization,
        utilization: this.floorplanConfig.core_utilization,
        macros: [],
        io_pads: [],
      },
      placement: {
        total_cells: 1000,
        placed_cells: 1000,
        overflow: 0,
        hpwl: 50000,
      },
      routing: {
        total_nets: 1200,
        routed_nets: 1200,
        vias: 3500,
        wire_length: 150000,
        overflow: 0,
        drc_violations: 0,
      },
      sign_off: {
        sta: {
          setup_violations: 0,
          hold_violations: 0,
          worst_slack: 0.127,
          total_endpoints: 500,
          met: true,
        },
        power: {
          ir_drop_max: 3.5,
          ir_drop_violations: 0,
          em_violations: 0,
          met: true,
        },
        drc: {
          total_violations: 0,
          spacing_violations: 0,
          width_violations: 0,
          enclosure_violations: 0,
          met: true,
        },
        lvs: {
          devices_match: true,
          nets_match: true,
          total_errors: 0,
          met: true,
        },
        antenna: {
          violations: 0,
          critical_nets: [],
          met: true,
        },
        erc: {
          total_violations: 0,
          short_violations: 0,
          open_violations: 0,
          met: true,
        },
        ready_for_tapeout: true,
      },
    };

    console.log('Physical design complete: Ready for tape-out');

    return result;
  }
}

// ============================================================================
// Utility Functions
// ============================================================================

/**
 * Create a signal
 */
export function createSignal(
  name: string,
  direction: Direction,
  width: number = 1
): Signal {
  return {
    name,
    direction,
    width,
  };
}

/**
 * Create a port
 */
export function createPort(
  name: string,
  direction: Direction,
  width: number = 1,
  options?: Partial<Port>
): Port {
  return {
    name,
    direction,
    width,
    ...options,
  };
}

/**
 * Create a parameter
 */
export function createParameter(
  name: string,
  defaultValue: number | string,
  description?: string
): Parameter {
  return {
    name,
    type: typeof defaultValue === 'number' ? 'integer' : 'string',
    default_value: defaultValue,
    description,
  };
}

/**
 * Create a module
 */
export function createModule(
  name: string,
  ports: Port[],
  language: HDL = 'verilog',
  parameters: Parameter[] = []
): Module {
  return {
    name,
    ports,
    parameters,
    language,
  };
}

// ============================================================================
// Exports
// ============================================================================

export * from './types';

export default {
  Design,
  Verification,
  Synthesis,
  PhysicalDesign,
  createSignal,
  createPort,
  createParameter,
  createModule,
};