'use server';

import { prisma } from '@/lib/prisma';
import { revalidatePath } from 'next/cache';
import { z } from 'zod';

// Validation schemas
const createImportSchema = z.object({
  name: z.string().min(1, 'Import name is required'),
  layoutId: z.number().int().positive('Layout configuration is required'),
  fileId: z.string().optional(),
});

const updateImportSchema = z.object({
  id: z.number().int().positive(),
  name: z.string().min(1, 'Import name is required'),
  fileId: z.string().optional(),
});

// Create a new import
export async function createImport(data: {
  name: string;
  layoutId: number;
  fileId?: string;
}) {
  try {
    const validatedData = createImportSchema.parse(data);

    const importRecord = await prisma.import.create({
      data: {
        name: validatedData.name,
        layoutId: validatedData.layoutId,
        importDate: new Date(),
        ...(validatedData.fileId && { fileId: validatedData.fileId }),
      },
      include: {
        layout: true,
      },
    });

    revalidatePath('/imports');
    return { success: true, data: importRecord };
  } catch (error) {
    console.error('Error creating import:', error);
    return { success: false, error: 'Failed to create import' };
  }
}

// Get all imports for the current user
export async function getImports(userId?: string) {
  try {
    const imports = await prisma.import.findMany({
      where: userId ? {
        fileId: {
          not: null,
        },
      } : {},
      include: {
        layout: true,
      },
      orderBy: {
        importDate: 'desc',
      },
    });

    // Filter by userId manually since Prisma doesn't have direct relation
    let filteredImports = imports;
    if (userId) {
      const fileIds = await prisma.file.findMany({
        where: {
          userId: userId,
        },
        select: {
          id: true,
        },
      });

      const userFileIds = new Set(fileIds.map(f => f.id));
      filteredImports = imports.filter(imp =>
        imp.fileId && userFileIds.has(imp.fileId)
      );
    }

    return { success: true, data: filteredImports };
  } catch (error) {
    console.error('Error fetching imports:', error);
    return { success: false, error: 'Failed to fetch imports' };
  }
}

// Get a single import by ID
export async function getImportById(id: number) {
  try {
    const importRecord = await prisma.import.findUnique({
      where: { id },
      include: {
        layout: {
          include: {
            sections: {
              include: {
                fields: true,
              },
            },
          },
        },
        cintasSummaries: {
          orderBy: {
            weekId: 'desc',
          },
        },
      },
    });

    if (!importRecord) {
      return { success: false, error: 'Import not found' };
    }

    return { success: true, data: importRecord };
  } catch (error) {
    console.error('Error fetching import:', error);
    return { success: false, error: 'Failed to fetch import' };
  }
}

// Update an import
export async function updateImport(data: {
  id: number;
  name: string;
  fileId?: string;
}) {
  try {
    const validatedData = updateImportSchema.parse(data);

    const importRecord = await prisma.import.update({
      where: { id: validatedData.id },
      data: {
        name: validatedData.name,
        ...(validatedData.fileId !== undefined && { fileId: validatedData.fileId }),
      },
      include: {
        layout: true,
      },
    });

    revalidatePath('/imports');
    return { success: true, data: importRecord };
  } catch (error) {
    console.error('Error updating import:', error);
    return { success: false, error: 'Failed to update import' };
  }
}

// Delete an import
export async function deleteImport(id: number) {
  try {
    await prisma.import.delete({
      where: { id },
    });

    revalidatePath('/imports');
    return { success: true };
  } catch (error) {
    console.error('Error deleting import:', error);
    return { success: false, error: 'Failed to delete import' };
  }
}

// Calculate Cintas summaries for an import
export async function calculateCintasSummaries(importId: number) {
  try {
    // This would typically call a stored procedure or perform calculations
    // For now, we'll simulate the calculation

    // In a real implementation, you might call:
    // await prisma.$executeRaw`CALL cintas_calculate_summary(${importId})`;

    // For demo purposes, we'll create some sample data
    const summaries = [
      {
        importId,
        week: '2024-W01',
        trrTotal: 100,
        fourWkAverages: 95,
        trrPlus4Wk: 195,
        powerAdds: 25,
        weekId: 1,
      },
      {
        importId,
        week: '2024-W02',
        trrTotal: 110,
        fourWkAverages: 100,
        trrPlus4Wk: 210,
        powerAdds: 30,
        weekId: 2,
      },
    ];

    // Clear existing summaries for this import
    await prisma.cintasSummary.deleteMany({
      where: { importId },
    });

    // Create new summaries
    const createdSummaries = await Promise.all(
      summaries.map(summary =>
        prisma.cintasSummary.create({
          data: summary,
        })
      )
    );

    return { success: true, data: createdSummaries };
  } catch (error) {
    console.error('Error calculating Cintas summaries:', error);
    return { success: false, error: 'Failed to calculate summaries' };
  }
}

// Get available layout configurations
export async function getLayoutConfigurations() {
  try {
    const layouts = await prisma.layoutConfiguration.findMany({
      include: {
        sections: {
          include: {
            fields: true,
          },
        },
      },
      orderBy: {
        name: 'asc',
      },
    });

    return { success: true, data: layouts };
  } catch (error) {
    console.error('Error fetching layout configurations:', error);
    return { success: false, error: 'Failed to fetch layout configurations' };
  }
}

// Get import summary (GET /api/imports/[id]/summary)
export async function getImportSummary(importId: number) {
  try {
    if (!importId || isNaN(importId)) {
      return { success: false, error: 'Invalid import ID' };
    }

    // Check if import exists
    const importRecord = await prisma.import.findUnique({
      where: { id: importId }
    });

    if (!importRecord) {
      return { success: false, error: 'Import not found' };
    }

    // Get basic summary data
    const totalRecords = await prisma.cintasInstallCalendar.count({
      where: { importId }
    });

    const cintasSummaries = await prisma.cintasSummary.findMany({
      where: { importId },
      orderBy: { weekId: 'desc' }
    });

    // Get file info
    const file = importRecord.fileId ? await prisma.file.findUnique({
      where: { id: importRecord.fileId }
    }) : null;

    const summary = {
      totalRecords,
      totalWeeks: cintasSummaries.length,
      cintasSummaries: cintasSummaries.map((summary: any) => ({
        id: summary.id,
        week: summary.week,
        trrTotal: summary.trrTotal,
        fourWkAverages: summary.fourWkAverages,
        trrPlus4Wk: summary.trrPlus4Wk,
        powerAdds: summary.powerAdds,
        weekId: summary.weekId
      }))
    };

    return {
      success: true,
      data: {
        importId,
        fileName: file?.filename || 'Unknown',
        uploadDate: importRecord.createdAt,
        summary,
        summaryExists: cintasSummaries.length > 0
      }
    };

  } catch (error) {
    console.error('Error fetching import summary:', error);
    return { success: false, error: 'Failed to fetch import summary' };
  }
}

// Generate import summary (POST /api/imports/[id]/summary)
export async function generateImportSummary(importId: number) {
  try {
    if (!importId || isNaN(importId)) {
      return { success: false, error: 'Invalid import ID' };
    }

    // Check if import exists
    const importRecord = await prisma.import.findUnique({
      where: { id: importId }
    });

    if (!importRecord) {
      return { success: false, error: 'Import not found' };
    }

    // Check if summary already exists
    const existingSummaries = await prisma.cintasSummary.count({
      where: { importId }
    });

    if (existingSummaries > 0) {
      // Return existing summary
      const cintasSummaries = await prisma.cintasSummary.findMany({
        where: { importId },
        orderBy: { weekId: 'desc' }
      });

      return {
        success: true,
        data: {
          importId,
          summaryGenerated: false,
          message: 'Summary already exists',
          summary: cintasSummaries.map((summary: any) => ({
            id: summary.id,
            week: summary.week,
            trrTotal: summary.trrTotal,
            fourWkAverages: summary.fourWkAverages,
            trrPlus4Wk: summary.trrPlus4Wk,
            powerAdds: summary.powerAdds,
            weekId: summary.weekId
          }))
        }
      };
    }

    // Generate new summary using stored procedure
    await prisma.$executeRawUnsafe(
      `CALL cintas_calculate_summary(${importId})`
    );

    // Fetch the newly generated summary
    const cintasSummaries = await prisma.cintasSummary.findMany({
      where: { importId },
      orderBy: { weekId: 'desc' }
    });

    return {
      success: true,
      data: {
        importId,
        summaryGenerated: true,
        message: 'Summary generated successfully',
        summary: cintasSummaries.map((summary: any) => ({
          id: summary.id,
          week: summary.week,
          trrTotal: summary.trrTotal,
          fourWkAverages: summary.fourWkAverages,
          trrPlus4Wk: summary.trrPlus4Wk,
          powerAdds: summary.powerAdds,
          weekId: summary.weekId
        }))
      }
    };

  } catch (error) {
    console.error('Error generating summary:', error);
    return { success: false, error: 'Failed to generate summary' };
  }
}

// Get import progress (GET /api/imports/[id]/progress)
export async function getImportProgress(importId: number) {
  try {
    if (!importId || isNaN(importId)) {
      return { success: false, error: 'Invalid import ID' };
    }

    // Check if import exists
    const importRecord = await prisma.import.findUnique({
      where: { id: importId }
    });

    if (!importRecord) {
      return { success: false, error: 'Import not found' };
    }

    // For now, we'll simulate progress based on the existence of records
    const totalRecords = await prisma.cintasInstallCalendar.count({
      where: { importId }
    });

    // Since we don't have status fields, we'll use record count as proxy
    const hasRecords = totalRecords > 0;

    return {
      success: true,
      data: {
        importId,
        status: hasRecords ? 'completed' : 'pending',
        progress: hasRecords ? 100 : 0,
        processedRecords: totalRecords,
        totalRecords: totalRecords,
        errorMessage: null,
        lastUpdated: importRecord.updatedAt,
        timestamp: new Date().toISOString()
      }
    };

  } catch (error) {
    console.error('Error fetching import progress:', error);
    return { success: false, error: 'Failed to fetch import progress' };
  }
}

// Trigger import process (POST /api/imports/[id]/trigger)
export async function triggerImportProcess(importId: number) {
  try {
    if (!importId || isNaN(importId)) {
      return { success: false, error: 'Invalid import ID' };
    }

    // Validate import exists
    const importRecord = await prisma.import.findUnique({
      where: { id: importId }
    });

    if (!importRecord) {
      return { success: false, error: 'Import not found' };
    }

    if (!importRecord.fileId) {
      return { success: false, error: 'No file attached to import' };
    }

    // Check if layout exists
    const layout = await prisma.layoutConfiguration.findUnique({
      where: { id: importRecord.layoutId }
    });

    if (!layout) {
      return { success: false, error: 'No layout configuration found' };
    }

    // Check if data already exists for this import
    const existingRecords = await prisma.cintasInstallCalendar.count({
      where: { importId }
    });

    if (existingRecords > 0) {
      return {
        success: true,
        message: 'Import already processed',
        importId,
        existingRecords
      };
    }

    // For now, we'll simulate the processing
    // In production, this would integrate with ImportProcessor
    // The ImportProcessor would handle the actual file processing

    return {
      success: true,
      message: 'Import process started successfully',
      importId
    };

  } catch (error) {
    console.error('Error triggering import:', error);
    return { success: false, error: 'Failed to trigger import' };
  }
}

// Update import progress (for internal use by ImportProcessor)
export async function updateImportProgress(
  importId: number,
  progress: {
    processedRecords: number;
    totalRecords: number;
    status: string;
    errorMessage?: string;
  }
) {
  try {
    // Since the Import model doesn't have these fields, we'll just return success
    // In a real implementation, you would need to add these fields to the schema
    console.log(`Import ${importId} progress: ${progress.processedRecords}/${progress.totalRecords} (${progress.status})`);

    return { success: true };
  } catch (error) {
    console.error('Error updating import progress:', error);
    return { success: false, error: 'Failed to update progress' };
  }
}