# ============================================================================
#  OUTPUT FORMATTERS
# ============================================================================

import os
import json
from datetime import datetime

from openpyxl import Workbook
from openpyxl.styles import Font, PatternFill, Alignment

from app.config import Config
from app.models.schemas import TestCase
from app.utils.logger import logger


class OutputFormatter:
    """Format test cases for different output types"""
    
    @staticmethod
    def to_excel(test_cases: list, filename: str) -> str:
        """Generate Excel file"""
        filepath = os.path.join(Config.OUTPUT_DIR, filename)
        
        wb = Workbook()
        ws = wb.active
        ws.title = "Test Cases"
        
        # Headers
        headers = [
            "Test Case ID", "Task Code", "Project", "Feature", "Title",
            "Objective", "Priority", "Type", "Category",
            "Preconditions", "Test Steps", "Expected Outcome"
        ]
        
        # Styling
        header_fill = PatternFill(start_color="4472C4", end_color="4472C4", fill_type="solid")
        header_font = Font(color="FFFFFF", bold=True)
        
        for col, header in enumerate(headers, start=1):
            cell = ws.cell(row=1, column=col, value=header)
            cell.fill = header_fill
            cell.font = header_font
            cell.alignment = Alignment(horizontal="center", vertical="center")
        
        # Data
        row = 2
        for tc in test_cases:
            ws.cell(row, 1, tc.test_case_id)
            ws.cell(row, 2, tc.task_code)
            ws.cell(row, 3, tc.project_name)
            ws.cell(row, 4, tc.feature_name)
            ws.cell(row, 5, tc.title)
            ws.cell(row, 6, tc.objective)
            ws.cell(row, 7, tc.priority.value)
            ws.cell(row, 8, tc.test_type.value)
            ws.cell(row, 9, tc.category.value)
            ws.cell(row, 10, "\n".join(tc.preconditions))
            
            # Format test steps
            steps_text = ""
            for step in tc.test_steps:
                steps_text += f"{step.step_number}. {step.action}\n"
                steps_text += f"   Expected: {step.expected_result}\n"
                if step.test_data:
                    steps_text += f"   Data: {step.test_data}\n"
                steps_text += "\n"
            
            ws.cell(row, 11, steps_text)
            ws.cell(row, 12, tc.expected_outcome)
            row += 1
        
        # Auto-adjust column widths
        for col in ws.columns:
            max_length = 0
            column = col[0].column_letter
            for cell in col:
                try:
                    if len(str(cell.value)) > max_length:
                        max_length = len(cell.value)
                except:
                    pass
            adjusted_width = min(max_length + 2, 50)
            ws.column_dimensions[column].width = adjusted_width
        
        wb.save(filepath)
        logger.info(f"📊 Excel file saved: {filepath}")
        return filepath
    
    @staticmethod
    def to_json(test_cases: list, filename: str, metadata: dict = None) -> str:
        """Generate JSON file with proper structure for CRUD operations"""
        filepath = os.path.join(Config.OUTPUT_DIR, filename)
        
        # Structure for CRUD compatibility
        data = {
            "test_cases": [tc.dict() for tc in test_cases],
            "metadata": metadata or {
                "created_at": datetime.now().isoformat(),
                "test_cases_count": len(test_cases)
            }
        }
        
        with open(filepath, 'w') as f:
            json.dump(data, f, indent=2, default=str)
        
        logger.info(f"📄 JSON file saved: {filepath}")
        return filepath