import { z } from "zod";
import { COOKIE_NAME } from "@shared/const";
import { getSessionCookieOptions } from "./_core/cookies";
import { systemRouter } from "./_core/systemRouter";
import { publicProcedure, protectedProcedure, router } from "./_core/trpc";
import {
  createInvoice,
  getInvoiceById,
  getInvoicesByUser,
  updateInvoice,
  deleteInvoice,
  searchInvoices,
  getInvoiceStats,
  createSourceFile,
  getSourceFileById,
  updateSourceFile,
  getUserSettings,
  upsertUserSettings,
  createLocalUser,
  getAllUsers,
  updateUserPassword,
  toggleUserActive,
  deleteUser,
  findDuplicateInvoice,
  createImportLog,
  getImportLogsByUser,
  getLlmLogsBySourceFile,
  getLlmLogsByInvoice,
} from "./db";
import { loginLocal, hashPassword, getAzureAuthUrl, isAzureAdConfigured, generateToken } from "./auth";
import { extractInvoicesWithMistral, generateMetadataJSON } from "./invoiceExtractor";
import { localStoragePut, generateStorageKey } from "./localStorage";
import { testSftpConnection, exportInvoiceToSftp, getUserSftpConfig } from "./sftpExport";
import { TRPCError } from "@trpc/server";

// Admin-only procedure
const adminProcedure = protectedProcedure.use(({ ctx, next }) => {
  if (ctx.user.role !== "admin") {
    throw new TRPCError({ code: "FORBIDDEN", message: "Admin access required" });
  }
  return next({ ctx });
});

export const appRouter = router({
  system: systemRouter,
  
  // ============= AUTH ROUTES =============
  auth: router({
    me: publicProcedure.query(opts => opts.ctx.user),
    
    // Local login (email + password)
    loginLocal: publicProcedure
      .input(z.object({
        email: z.string().email(),
        password: z.string().min(6),
      }))
      .mutation(async ({ input, ctx }) => {
        const result = await loginLocal(input.email, input.password);
        
        if (!result) {
          throw new TRPCError({ code: "UNAUTHORIZED", message: "Invalid email or password" });
        }
        
        // Set auth cookie
        ctx.res.cookie("auth_token", result.token, {
          httpOnly: true,
          secure: process.env.NODE_ENV === "production",
          sameSite: "lax",
          path: "/",
          maxAge: 7 * 24 * 60 * 60 * 1000, // 7 days
        });
        
        return { user: result.user };
      }),
    
    // Get Azure AD login URL
    getAzureLoginUrl: publicProcedure.query(async () => {
      if (!isAzureAdConfigured()) {
        throw new TRPCError({ code: "BAD_REQUEST", message: "Azure AD not configured" });
      }
      
      const url = await getAzureAuthUrl();
      return { url };
    }),
    
    // Check if Azure AD is available
    isAzureAdAvailable: publicProcedure.query(() => {
      return { available: isAzureAdConfigured() };
    }),
    
    logout: publicProcedure.mutation(({ ctx }) => {
      const cookieOptions = getSessionCookieOptions(ctx.req);
      ctx.res.clearCookie(COOKIE_NAME, { ...cookieOptions, maxAge: -1 });
      ctx.res.clearCookie("auth_token", { path: "/", maxAge: -1 });
      return { success: true };
    }),
  }),
  
  // ============= INVOICE ROUTES =============
  invoices: router({
    // Upload and process PDF file
    upload: protectedProcedure
      .input(z.object({
        fileName: z.string(),
        fileData: z.string(), // Base64 encoded PDF
      }))
      .mutation(async ({ input, ctx }) => {
        const userId = ctx.user.id;
        
        // Decode base64 file data
        const fileBuffer = Buffer.from(input.fileData, "base64");
        
        // Store source file
        const sourceFileKey = generateStorageKey(userId, input.fileName);
        const { url: sourceFileUrl } = await localStoragePut(sourceFileKey, fileBuffer, "application/pdf");
        
        // Create source file record
        const sourceFile = await createSourceFile({
          userId,
          fileName: input.fileName,
          fileKey: sourceFileKey,
          fileUrl: sourceFileUrl,
          processingStatus: "processing",
        });
        
        // Start extraction process (async - don't wait)
        (async () => {
          try {
            // Get user settings for custom keywords
            const settings = await getUserSettings(userId);
            const customKeywords = settings ? {
              invoiceNumber: settings.invoiceNumberKeywords,
              deliveryNote: settings.deliveryNoteKeywords,
              orderNumber: settings.orderNumberKeywords,
              supplier: settings.supplierKeywords,
              totalAmount: settings.totalAmountKeywords,
            } : undefined;
            
            const model = settings?.llmModel || "mistral-large-latest";
            
            // Extract invoices
            const result = await extractInvoicesWithMistral(
              fileBuffer,
              userId,
              sourceFile.id,
              model,
              customKeywords
            );
            
            // Update source file with total count
            await updateSourceFile(sourceFile.id, {
              totalInvoicesDetected: result.invoiceCount,
              processingProgress: `Extraction ${result.invoiceCount} facture(s) détectée(s)`,
            });
            
            // Process each invoice
            let importedCount = 0;
            let duplicatesCount = 0;
            let errorsCount = 0;
            const duplicateDetails: any[] = [];
            const errorDetails: any[] = [];
            
            for (let i = 0; i < result.invoices.length; i++) {
              const invoiceData = result.invoices[i]!;
              
              try {
                // Update progress
                await updateSourceFile(sourceFile.id, {
                  processingProgress: `Extraction ${i + 1}/${result.invoiceCount} factures...`,
                });
                
                // Check for duplicates
                const duplicate = await findDuplicateInvoice(
                  invoiceData.supplierName,
                  invoiceData.invoiceNumber,
                  invoiceData.invoiceDate
                );
                
                if (duplicate) {
                  duplicatesCount++;
                  duplicateDetails.push({
                    supplierName: invoiceData.supplierName,
                    invoiceNumber: invoiceData.invoiceNumber,
                    invoiceDate: invoiceData.invoiceDate,
                  });
                  continue;
                }
                
                // Generate metadata JSON
                const metadataJson = generateMetadataJSON(invoiceData);
                const metadataKey = generateStorageKey(userId, `${input.fileName}-${i + 1}-metadata.json`);
                const { url: metadataUrl } = await localStoragePut(
                  metadataKey,
                  Buffer.from(metadataJson),
                  "application/json"
                );
                
                // Create invoice record
                await createInvoice({
                  userId,
                  sourceFileId: sourceFile.id,
                  invoiceIndexInFile: i + 1,
                  fileName: `${input.fileName} - Facture ${i + 1}`,
                  fileKey: sourceFileKey, // Same as source for now
                  fileUrl: sourceFileUrl,
                  supplierName: invoiceData.supplierName,
                  invoiceNumber: invoiceData.invoiceNumber,
                  invoiceDate: invoiceData.invoiceDate,
                  deliveryNoteNumber: invoiceData.deliveryNoteNumber,
                  orderNumber: invoiceData.orderNumber,
                  totalAmount: invoiceData.totalAmount?.toString(),
                  pageRange: invoiceData.pageRange,
                  qualityScore: invoiceData.qualityScore,
                  metadataFileKey: metadataKey,
                  metadataFileUrl: metadataUrl,
                  status: "completed",
                });
                
                importedCount++;
              } catch (error: any) {
                errorsCount++;
                errorDetails.push({
                  invoiceIndex: i + 1,
                  error: error.message,
                });
              }
            }
            
            // Update source file status
            await updateSourceFile(sourceFile.id, {
              processingStatus: "completed",
              processingProgress: `Terminé: ${importedCount} importée(s), ${duplicatesCount} doublon(s)`,
            });
            
            // Create import log
            await createImportLog({
              userId,
              sourceFileId: sourceFile.id,
              fileName: input.fileName,
              totalInvoicesDetected: result.invoiceCount,
              invoicesImported: importedCount,
              duplicatesIgnored: duplicatesCount,
              errors: errorsCount,
              duplicateDetails: JSON.stringify(duplicateDetails),
              errorDetails: JSON.stringify(errorDetails),
            });
            
          } catch (error: any) {
            console.error("[Upload] Extraction failed:", error);
            await updateSourceFile(sourceFile.id, {
              processingStatus: "error",
              processingProgress: `Erreur: ${error.message}`,
            });
          }
        })();
        
        return { sourceFileId: sourceFile.id };
      }),
    
    list: protectedProcedure.query(async ({ ctx }) => {
      return getInvoicesByUser(ctx.user.id);
    }),
    
    getById: protectedProcedure
      .input(z.object({ id: z.number() }))
      .query(async ({ input, ctx }) => {
        const invoice = await getInvoiceById(input.id);
        if (!invoice || invoice.userId !== ctx.user.id) {
          throw new TRPCError({ code: "NOT_FOUND" });
        }
        return invoice;
      }),
    
    update: protectedProcedure
      .input(z.object({
        id: z.number(),
        data: z.object({
          supplierName: z.string().optional(),
          invoiceNumber: z.string().optional(),
          invoiceDate: z.date().optional(),
          deliveryNoteNumber: z.string().optional(),
          orderNumber: z.string().optional(),
          totalAmount: z.string().optional(),
        }),
      }))
      .mutation(async ({ input, ctx }) => {
        const invoice = await getInvoiceById(input.id);
        if (!invoice || invoice.userId !== ctx.user.id) {
          throw new TRPCError({ code: "NOT_FOUND" });
        }
        
        await updateInvoice(input.id, {
          ...input.data,
          manuallyEdited: 1,
        });
        
        return { success: true };
      }),
    
    delete: protectedProcedure
      .input(z.object({ id: z.number() }))
      .mutation(async ({ input, ctx }) => {
        const invoice = await getInvoiceById(input.id);
        if (!invoice || invoice.userId !== ctx.user.id) {
          throw new TRPCError({ code: "NOT_FOUND" });
        }
        
        await deleteInvoice(input.id);
        return { success: true };
      }),
    
    search: protectedProcedure
      .input(z.object({ query: z.string() }))
      .query(async ({ input, ctx }) => {
        return searchInvoices(ctx.user.id, input.query);
      }),
    
    getStats: protectedProcedure.query(async ({ ctx }) => {
      return getInvoiceStats(ctx.user.id);
    }),
  }),
  
  // ============= SOURCE FILES ROUTES =============
  sourceFiles: router({
    getByIds: protectedProcedure
      .input(z.object({ ids: z.array(z.number()) }))
      .query(async ({ input, ctx }) => {
        const files = await Promise.all(
          input.ids.map(id => getSourceFileById(id))
        );
        return files.filter(f => f && f.userId === ctx.user.id);
      }),
  }),
  
  // ============= SETTINGS ROUTES =============
  settings: router({
    get: protectedProcedure.query(async ({ ctx }) => {
      return getUserSettings(ctx.user.id);
    }),
    
    upsert: protectedProcedure
      .input(z.object({
        llmModel: z.string().optional(),
        orderNumberFormat: z.string().optional(),
        invoiceNumberKeywords: z.string().optional(),
        deliveryNoteKeywords: z.string().optional(),
        orderNumberKeywords: z.string().optional(),
        supplierKeywords: z.string().optional(),
        totalAmountKeywords: z.string().optional(),
        sftpHost: z.string().optional(),
        sftpPort: z.number().optional(),
        sftpUsername: z.string().optional(),
        sftpPassword: z.string().optional(),
        sftpRemotePath: z.string().optional(),
        sftpAutoExport: z.number().optional(),
        llmLogsRetentionMonths: z.number().optional(),
      }))
      .mutation(async ({ input, ctx }) => {
        await upsertUserSettings({
          userId: ctx.user.id,
          ...input,
        });
        return { success: true };
      }),
  }),
  
  // ============= ADMIN ROUTES =============
  admin: router({
    createUser: adminProcedure
      .input(z.object({
        email: z.string().email(),
        password: z.string().min(6),
        name: z.string(),
        role: z.enum(["user", "admin"]),
      }))
      .mutation(async ({ input }) => {
        const passwordHash = await hashPassword(input.password);
        const user = await createLocalUser(input.email, passwordHash, input.name, input.role);
        return { user };
      }),
    
    getAllUsers: adminProcedure.query(async () => {
      return getAllUsers();
    }),
    
    updateUserPassword: adminProcedure
      .input(z.object({
        userId: z.number(),
        newPassword: z.string().min(6),
      }))
      .mutation(async ({ input }) => {
        const passwordHash = await hashPassword(input.newPassword);
        await updateUserPassword(input.userId, passwordHash);
        return { success: true };
      }),
    
    toggleUserActive: adminProcedure
      .input(z.object({
        userId: z.number(),
        isActive: z.number(),
      }))
      .mutation(async ({ input }) => {
        await toggleUserActive(input.userId, input.isActive);
        return { success: true };
      }),
    
    deleteUser: adminProcedure
      .input(z.object({ userId: z.number() }))
      .mutation(async ({ input }) => {
        await deleteUser(input.userId);
        return { success: true };
      }),
  }),
  
  // ============= SFTP ROUTES =============
  sftp: router({
    testConnection: protectedProcedure.mutation(async ({ ctx }) => {
      const config = await getUserSftpConfig(ctx.user.id);
      if (!config) {
        throw new TRPCError({ code: "BAD_REQUEST", message: "SFTP not configured" });
      }
      
      const success = await testSftpConnection(config);
      return { success };
    }),
    
    exportToPdf: protectedProcedure
      .input(z.object({ invoiceIds: z.array(z.number()) }))
      .mutation(async ({ input, ctx }) => {
        // Validate that all invoices have quality score of 100
        const invoices = await Promise.all(
          input.invoiceIds.map(id => getInvoiceById(id))
        );
        
        const invalidInvoices = invoices.filter(
          inv => !inv || inv.userId !== ctx.user.id || (inv.qualityScore || 0) < 100
        );
        
        if (invalidInvoices.length > 0) {
          throw new TRPCError({ 
            code: "BAD_REQUEST", 
            message: "Toutes les factures doivent avoir un score de qualit\u00e9 de 100% pour \u00eatre export\u00e9es" 
          });
        }
        
        // Update export status
        for (const invoice of invoices) {
          if (invoice) {
            await updateInvoice(invoice.id, {
              exportStatus: "exported",
              exportedAt: new Date(),
              exportMode: "manual",
            });
          }
        }
        
        // Return the file URLs for PDF generation on client side
        return {
          success: true,
          invoices: invoices.filter(Boolean).map(inv => ({
            id: inv!.id,
            fileUrl: inv!.fileUrl,
            supplierName: inv!.supplierName,
            invoiceNumber: inv!.invoiceNumber,
            invoiceDate: inv!.invoiceDate,
          }))
        };
      }),
    
    exportInvoices: protectedProcedure
      .input(z.object({ invoiceIds: z.array(z.number()) }))
      .mutation(async ({ input, ctx }) => {
        const config = await getUserSftpConfig(ctx.user.id);
        if (!config) {
          throw new TRPCError({ code: "BAD_REQUEST", message: "SFTP not configured" });
        }
        
        let successCount = 0;
        let errorCount = 0;
        
        for (const invoiceId of input.invoiceIds) {
          try {
            const invoice = await getInvoiceById(invoiceId);
            if (!invoice || invoice.userId !== ctx.user.id) {
              errorCount++;
              continue;
            }
            
            await exportInvoiceToSftp(
              config,
              invoice.fileKey,
              invoice.metadataFileKey,
              invoice.invoiceDate || new Date()
            );
            
            // Update invoice export status
            await updateInvoice(invoiceId, {
              exportedAt: new Date(),
              exportMode: "manual",
            });
            
            successCount++;
          } catch (error) {
            console.error(`[SFTP] Failed to export invoice ${invoiceId}:`, error);
            errorCount++;
          }
        }
        
        return { successCount, errorCount };
      }),
  }),
  
  // ============= IMPORT LOGS ROUTES =============
  importLogs: router({
    getByUser: protectedProcedure.query(async ({ ctx }) => {
      return getImportLogsByUser(ctx.user.id);
    }),
  }),
  
  // ============= LLM LOGS ROUTES =============
  llmLogs: router({
    getBySourceFile: protectedProcedure
      .input(z.object({ sourceFileId: z.number() }))
      .query(async ({ input }) => {
        return getLlmLogsBySourceFile(input.sourceFileId);
      }),
    
    getByInvoice: protectedProcedure
      .input(z.object({ invoiceId: z.number() }))
      .query(async ({ input }) => {
        return getLlmLogsByInvoice(input.invoiceId);
      }),
  }),
});

export type AppRouter = typeof appRouter;