import prisma from '../utils/db';

export class AssetService {
  public async createAsset(data: any) {
    const { sharedOrgIds, shares, tags, ...rest } = data;
    
    // Parse tags
    let parsedTags: string[] = [];
    if (Array.isArray(tags)) {
      parsedTags = tags;
    } else if (typeof tags === 'string' && tags.trim()) {
      try {
        parsedTags = JSON.parse(tags);
      } catch {
        parsedTags = tags.split(',').map((t: string) => t.trim()).filter(Boolean);
      }
    }

    const asset = await prisma.asset.create({
      data: {
        ...rest,
        tags: parsedTags,
      }
    });

    // Handle immediate sharing
    if (shares) {
      let parsedShares: any[] = [];
      if (Array.isArray(shares)) {
        parsedShares = shares;
      } else if (typeof shares === 'string' && shares.trim()) {
        try {
          parsedShares = JSON.parse(shares);
        } catch {
          parsedShares = shares.split(',').map((id: string) => ({ organizationId: id.trim(), userId: null })).filter(s => s.organizationId);
        }
      }

      if (parsedShares.length > 0) {
        await prisma.sharedAsset.createMany({
          data: parsedShares.map(s => ({
            assetId: asset.id,
            organizationId: s.organizationId,
            userId: s.userId || null,
          })),
          skipDuplicates: true,
        });
      }
    } else if (sharedOrgIds) {
      let orgIds: string[] = [];
      if (Array.isArray(sharedOrgIds)) {
        orgIds = sharedOrgIds;
      } else if (typeof sharedOrgIds === 'string' && sharedOrgIds.trim()) {
        try {
          orgIds = JSON.parse(sharedOrgIds);
        } catch {
          orgIds = sharedOrgIds.split(',').map((id: string) => id.trim()).filter(Boolean);
        }
      }

      if (orgIds.length > 0) {
        await prisma.sharedAsset.createMany({
          data: orgIds.map(orgId => ({
            assetId: asset.id,
            organizationId: orgId,
            userId: null,
          })),
          skipDuplicates: true,
        });
      }
    }

    return this.getAssetById(asset.id);
  }

  public async getAssets(userContext?: { role: string; userId: string }) {
    if (!userContext) {
      return [];
    }

    if (userContext.role === 'ADMIN') {
      return await prisma.asset.findMany({
        include: {
          sharedWith: {
            include: {
              organization: {
                select: { id: true, name: true }
              },
              user: {
                select: { id: true, email: true }
              }
            }
          },
          downloadRequests: {
            include: {
              user: {
                select: { id: true, email: true }
              }
            }
          }
        },
        orderBy: { createdAt: 'desc' }
      });
    }

    // For clients/partners, find user organization first
    const user = await prisma.user.findUnique({
      where: { id: userContext.userId }
    });

    if (!user || !user.organizationId) {
      return [];
    }

    return await prisma.asset.findMany({
      where: {
        status: 'published',
        sharedWith: {
          some: {
            organizationId: user.organizationId,
            OR: [
              { userId: null },
              { userId: user.id }
            ]
          }
        }
      },
      include: {
        sharedWith: {
          include: {
            organization: {
              select: { id: true, name: true }
            },
            user: {
              select: { id: true, email: true }
            }
          }
        },
        downloadRequests: {
          where: { userId: userContext.userId }
        }
      },
      orderBy: { createdAt: 'desc' }
    });
  }

  public async getAssetById(id: string) {
    return await prisma.asset.findUnique({
      where: { id },
      include: {
        sharedWith: {
          include: {
            organization: {
              select: { id: true, name: true }
            },
            user: {
              select: { id: true, email: true }
            }
          }
        },
        downloadRequests: {
          include: {
            user: {
              select: { id: true, email: true }
            }
          }
        }
      }
    });
  }

  public async updateAsset(id: string, data: any) {
    const { sharedOrgIds, shares, tags, ...rest } = data;
    
    const updateData: any = { ...rest };

    if (tags !== undefined) {
      let parsedTags: string[] = [];
      if (Array.isArray(tags)) {
        parsedTags = tags;
      } else if (typeof tags === 'string') {
        try {
          parsedTags = JSON.parse(tags);
        } catch {
          parsedTags = tags.split(',').map((t: string) => t.trim()).filter(Boolean);
        }
      }
      updateData.tags = parsedTags;
    }

    await prisma.asset.update({
      where: { id },
      data: updateData
    });

    if (shares !== undefined) {
      let parsedShares: any[] = [];
      if (Array.isArray(shares)) {
        parsedShares = shares;
      } else if (typeof shares === 'string') {
        try {
          parsedShares = JSON.parse(shares);
        } catch {
          parsedShares = shares.split(',').map((oid: string) => ({ organizationId: oid.trim(), userId: null })).filter(s => s.organizationId);
        }
      }

      await prisma.sharedAsset.deleteMany({ where: { assetId: id } });
      if (parsedShares.length > 0) {
        await prisma.sharedAsset.createMany({
          data: parsedShares.map(s => ({
            assetId: id,
            organizationId: s.organizationId,
            userId: s.userId || null,
          })),
          skipDuplicates: true
        });
      }
    } else if (sharedOrgIds !== undefined) {
      let orgIds: string[] = [];
      if (Array.isArray(sharedOrgIds)) {
        orgIds = sharedOrgIds;
      } else if (typeof sharedOrgIds === 'string') {
        try {
          orgIds = JSON.parse(sharedOrgIds);
        } catch {
          orgIds = sharedOrgIds.split(',').map((oid: string) => oid.trim()).filter(Boolean);
        }
      }

      await prisma.sharedAsset.deleteMany({ where: { assetId: id } });
      if (orgIds.length > 0) {
        await prisma.sharedAsset.createMany({
          data: orgIds.map(orgId => ({
            assetId: id,
            organizationId: orgId,
            userId: null,
          })),
          skipDuplicates: true
        });
      }
    }

    return this.getAssetById(id);
  }

  public async shareAsset(assetId: string, organizationIds: string[]) {
    await prisma.sharedAsset.createMany({
      data: organizationIds.map(orgId => ({
        assetId,
        organizationId: orgId,
        userId: null,
      })),
      skipDuplicates: true
    });
    return this.getAssetById(assetId);
  }

  public async unshareAsset(assetId: string, organizationIds: string[]) {
    await prisma.sharedAsset.deleteMany({
      where: {
        assetId,
        organizationId: { in: organizationIds },
        userId: null
      }
    });
    return this.getAssetById(assetId);
  }

  public async incrementDownloadCount(id: string) {
    return await prisma.asset.update({
      where: { id },
      data: {
        downloadsCount: { increment: 1 }
      }
    });
  }

  public async deleteAsset(id: string) {
    return await prisma.asset.delete({ where: { id } });
  }

  // Download Requests Access Methods
  public async requestDownload(assetId: string, userId: string) {
    const existing = await prisma.downloadRequest.findFirst({
      where: { assetId, userId }
    });
    if (existing) {
      return await prisma.downloadRequest.update({
        where: { id: existing.id },
        data: { status: 'PENDING' }
      });
    }
    return await prisma.downloadRequest.create({
      data: {
        assetId,
        userId,
        status: 'PENDING'
      }
    });
  }

  public async approveDownloadRequest(requestId: string) {
    return await prisma.downloadRequest.update({
      where: { id: requestId },
      data: { status: 'APPROVED' }
    });
  }

  public async rejectDownloadRequest(requestId: string) {
    return await prisma.downloadRequest.update({
      where: { id: requestId },
      data: { status: 'REJECTED' }
    });
  }
}