/**
 * Component: Fetch Ebook by ASIN API
 * Documentation: documentation/integrations/ebook-sidecar.md
 *
 * Creates an ebook request for an available audiobook (by ASIN)
 * Supports both audiobooks with parent requests and orphan audiobooks (imported outside RMAB)
 * Includes approval logic for non-admin users
 */

import { NextRequest, NextResponse } from 'next/server';
import { requireAuth, AuthenticatedRequest } from '@/lib/middleware/auth';
import { prisma } from '@/lib/db';
import { getJobQueueService } from '@/lib/services/job-queue.service';
import { findPlexMatch } from '@/lib/utils/audiobook-matcher';
import { getAudibleService } from '@/lib/integrations/audible.service';
import { RMABLogger } from '@/lib/utils/logger';

const logger = RMABLogger.create('API.Audiobooks.FetchEbook');

// Statuses that indicate an active/in-progress ebook request
const ACTIVE_EBOOK_STATUSES = [
  'pending',
  'awaiting_approval',
  'searching',
  'downloading',
  'processing',
  'downloaded',
  'available',
];

// Statuses that allow retry
const RETRYABLE_STATUSES = ['failed', 'awaiting_search'];

/**
 * POST /api/audiobooks/[asin]/fetch-ebook
 * Create an ebook request for an available audiobook
 */
export async function POST(
  request: NextRequest,
  { params }: { params: Promise<{ asin: string }> }
) {
  return requireAuth(request, async (req: AuthenticatedRequest) => {
    try {
      const { asin } = await params;

      if (!asin || asin.length !== 10) {
        return NextResponse.json(
          { error: 'Valid ASIN is required' },
          { status: 400 }
        );
      }

      if (!req.user) {
        return NextResponse.json(
          { error: 'Unauthorized' },
          { status: 401 }
        );
      }

      // Check which ebook sources are enabled
      const [annasArchiveConfig, indexerSearchConfig, legacyConfig] = await Promise.all([
        prisma.configuration.findUnique({ where: { key: 'ebook_annas_archive_enabled' } }),
        prisma.configuration.findUnique({ where: { key: 'ebook_indexer_search_enabled' } }),
        prisma.configuration.findUnique({ where: { key: 'ebook_sidecar_enabled' } }),
      ]);

      const isAnnasArchiveEnabled = annasArchiveConfig?.value === 'true' ||
        (annasArchiveConfig === null && legacyConfig?.value === 'true');
      const isIndexerSearchEnabled = indexerSearchConfig?.value === 'true';

      if (!isAnnasArchiveEnabled && !isIndexerSearchEnabled) {
        return NextResponse.json(
          { error: 'E-book feature is not enabled (no sources configured)' },
          { status: 400 }
        );
      }

      // First, check if the audiobook is available in Plex library
      // This works even for books imported outside RMAB
      const audibleService = getAudibleService();
      let audibleData = null;
      try {
        audibleData = await audibleService.getAudiobookDetails(asin);
      } catch (error) {
        logger.warn(`Failed to fetch Audible data for ASIN ${asin}: ${error instanceof Error ? error.message : 'Unknown error'}`);
      }

      if (!audibleData) {
        return NextResponse.json(
          { error: 'Audiobook not found on Audible' },
          { status: 404 }
        );
      }

      // Check Plex availability using Audible metadata
      const plexMatch = await findPlexMatch({
        asin,
        title: audibleData.title,
        author: audibleData.author,
      });

      // Find or create audiobook record
      let audiobook = await prisma.audiobook.findFirst({
        where: { audibleAsin: asin },
      });

      // Check for available request if audiobook exists in database
      let availableRequest = null;
      if (audiobook) {
        availableRequest = await prisma.request.findFirst({
          where: {
            audiobookId: audiobook.id,
            type: 'audiobook',
            status: { in: ['downloaded', 'available'] },
            deletedAt: null,
          },
        });
      }

      const isAvailable = !!availableRequest || !!plexMatch;

      if (!isAvailable) {
        return NextResponse.json(
          { error: 'Audiobook must be available in your library before requesting an ebook' },
          { status: 400 }
        );
      }

      // If audiobook doesn't exist in database but is in Plex, create it
      if (!audiobook) {
        logger.info(`Creating audiobook record for "${audibleData.title}" (imported outside RMAB)`);

        // Extract year from release date
        let year: number | undefined;
        if (audibleData.releaseDate) {
          try {
            const releaseYear = new Date(audibleData.releaseDate).getFullYear();
            if (!isNaN(releaseYear)) {
              year = releaseYear;
            }
          } catch {
            // Ignore parsing errors
          }
        }

        audiobook = await prisma.audiobook.create({
          data: {
            audibleAsin: asin,
            title: audibleData.title,
            author: audibleData.author,
            narrator: audibleData.narrator,
            description: audibleData.description,
            coverArtUrl: audibleData.coverArtUrl,
            year,
            series: audibleData.series,
            seriesPart: audibleData.seriesPart,
            status: 'available', // Mark as available since it's in Plex
          },
        });
        logger.info(`Created audiobook ${audiobook.id} for "${audibleData.title}"`);
      }

      // Check for existing ebook request for this audiobook
      const existingEbookRequest = await prisma.request.findFirst({
        where: {
          audiobookId: audiobook.id,
          type: 'ebook',
          deletedAt: null,
        },
        orderBy: { createdAt: 'desc' },
      });

      // Handle existing ebook request
      if (existingEbookRequest) {
        // If in active status, block
        if (ACTIVE_EBOOK_STATUSES.includes(existingEbookRequest.status)) {
          return NextResponse.json({
            success: false,
            message: `E-book request already exists (status: ${existingEbookRequest.status})`,
            requestId: existingEbookRequest.id,
          }, { status: 409 });
        }

        // If retryable, reset and retry
        if (RETRYABLE_STATUSES.includes(existingEbookRequest.status)) {
          await prisma.request.update({
            where: { id: existingEbookRequest.id },
            data: {
              status: 'pending',
              progress: 0,
              errorMessage: null,
              updatedAt: new Date(),
            },
          });

          const jobQueue = getJobQueueService();
          await jobQueue.addSearchEbookJob(existingEbookRequest.id, {
            id: audiobook.id,
            title: audiobook.title,
            author: audiobook.author,
            asin: audiobook.audibleAsin || undefined,
          });

          logger.info(`Retrying ebook request ${existingEbookRequest.id} for "${audiobook.title}"`);

          return NextResponse.json({
            success: true,
            message: 'E-book search retried',
            requestId: existingEbookRequest.id,
          });
        }
      }

      // Check if approval is needed for non-admin users
      const user = await prisma.user.findUnique({
        where: { id: req.user.id },
        select: {
          role: true,
          autoApproveRequests: true,
          plexUsername: true,
        },
      });

      if (!user) {
        return NextResponse.json(
          { error: 'User not found' },
          { status: 404 }
        );
      }

      let needsApproval = false;

      if (user.role === 'admin') {
        needsApproval = false;
      } else {
        if (user.autoApproveRequests === true) {
          needsApproval = false;
        } else if (user.autoApproveRequests === false) {
          needsApproval = true;
        } else {
          // User setting is null, check global setting
          const globalConfig = await prisma.configuration.findUnique({
            where: { key: 'auto_approve_requests' },
          });
          // Default to true if not configured (backward compatibility)
          const globalAutoApprove = globalConfig === null ? true : globalConfig.value === 'true';
          needsApproval = !globalAutoApprove;
        }
      }

      const jobQueue = getJobQueueService();

      if (needsApproval) {
        // Create ebook request with awaiting_approval status
        const ebookRequest = await prisma.request.create({
          data: {
            userId: req.user.id,
            audiobookId: audiobook.id,
            type: 'ebook',
            parentRequestId: availableRequest?.id || null, // Link to parent if exists
            status: 'awaiting_approval',
            progress: 0,
            customSearchTerms: availableRequest?.customSearchTerms || null,
          },
        });

        // Send pending approval notification
        await jobQueue.addNotificationJob(
          'request_pending_approval',
          ebookRequest.id,
          `${audiobook.title} (Ebook)`,
          audiobook.author,
          user.plexUsername || 'Unknown User'
        ).catch((error) => {
          logger.error('Failed to queue notification', { error: error instanceof Error ? error.message : String(error) });
        });

        logger.info(`Ebook request ${ebookRequest.id} created, awaiting admin approval`);

        return NextResponse.json({
          success: true,
          message: 'Ebook request submitted for admin approval',
          requestId: ebookRequest.id,
          needsApproval: true,
        }, { status: 201 });
      } else {
        // Auto-approved - create request and start search
        const ebookRequest = await prisma.request.create({
          data: {
            userId: req.user.id,
            audiobookId: audiobook.id,
            type: 'ebook',
            parentRequestId: availableRequest?.id || null,
            status: 'pending',
            progress: 0,
            customSearchTerms: availableRequest?.customSearchTerms || null,
          },
        });

        logger.info(`Created ebook request ${ebookRequest.id} for "${audiobook.title}"`);

        // Trigger ebook search job
        await jobQueue.addSearchEbookJob(ebookRequest.id, {
          id: audiobook.id,
          title: audiobook.title,
          author: audiobook.author,
          asin: audiobook.audibleAsin || undefined,
        });

        // Send approved notification
        await jobQueue.addNotificationJob(
          'request_approved',
          ebookRequest.id,
          `${audiobook.title} (Ebook)`,
          audiobook.author,
          user.plexUsername || 'Unknown User'
        ).catch((error) => {
          logger.error('Failed to queue notification', { error: error instanceof Error ? error.message : String(error) });
        });

        logger.info(`Triggered search_ebook job for request ${ebookRequest.id}`);

        return NextResponse.json({
          success: true,
          message: 'E-book request created and search started',
          requestId: ebookRequest.id,
          needsApproval: false,
        }, { status: 201 });
      }
    } catch (error) {
      logger.error('Unexpected error', { error: error instanceof Error ? error.message : String(error) });
      return NextResponse.json(
        { error: error instanceof Error ? error.message : 'Internal server error' },
        { status: 500 }
      );
    }
  });
}