import {
  Injectable,
  NotFoundException,
  ConflictException,
} from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';
import {
  CreateAgentProfileDto,
  UpdateAgentProfileDto,
  SearchAgentsDto,
  SaveFieldValuesDto,
} from './dto';
import { Prisma, Prisma as PrismaTypes, VerificationStatus } from '@prisma/client';

function generateSlug(firstName: string, lastName: string): string {
  const base = `${firstName}-${lastName}`
    .toLowerCase()
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '');
  const uniqueSuffix = Math.random().toString(36).substring(2, 8);
  return `${base}-${uniqueSuffix}`;
}

@Injectable()
export class AgentsService {
  constructor(private prisma: PrismaService) {}

  async createProfile(userId: string, dto: CreateAgentProfileDto) {
    // Check if user already has an agent profile
    const existingProfile = await this.prisma.agentProfile.findUnique({
      where: { userId },
    });

    if (existingProfile) {
      throw new ConflictException('User already has an agent profile');
    }

    const slug = generateSlug(dto.firstName, dto.lastName);

    const profile = await this.prisma.agentProfile.create({
      data: {
        ...dto,
        userId,
        slug,
      },
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    return profile;
  }

  async getProfile(userId: string) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { userId },
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    return profile;
  }

  async getProfileById(profileId: string) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: profileId },
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    return profile;
  }

  async updateProfile(userId: string, dto: UpdateAgentProfileDto) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { userId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    const updatedProfile = await this.prisma.agentProfile.update({
      where: { userId },
      data: dto,
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    return updatedProfile;
  }

  async searchAgents(dto: SearchAgentsDto) {
    const {
      search,
      city,
      state,
      country,
      agentTypeId,
      isVerified,
      page = 1,
      limit = 10,
      sortBy = 'createdAt',
      sortOrder = 'desc',
    } = dto;

    const skip = (page - 1) * limit;

    // Build where clause
    const where: Prisma.AgentProfileWhereInput = {};

    if (search) {
      where.OR = [
        { firstName: { contains: search, mode: 'insensitive' } },
        { lastName: { contains: search, mode: 'insensitive' } },
        { bio: { contains: search, mode: 'insensitive' } },
        { headline: { contains: search, mode: 'insensitive' } },
        { companyName: { contains: search, mode: 'insensitive' } },
      ];
    }

    if (city) {
      where.city = { contains: city, mode: 'insensitive' };
    }

    if (state) {
      where.state = { contains: state, mode: 'insensitive' };
    }

    if (country) {
      where.country = { contains: country, mode: 'insensitive' };
    }

    if (isVerified !== undefined) {
      where.isVerified = isVerified;
    }

    // Filter by agent type
    if (agentTypeId) {
      where.agentTypeId = agentTypeId;
    }

    // Build orderBy
    const orderBy: Prisma.AgentProfileOrderByWithRelationInput = {};
    if (sortBy === 'averageRating') {
      orderBy.averageRating = sortOrder;
    } else if (sortBy === 'totalReviews') {
      orderBy.totalReviews = sortOrder;
    } else if (sortBy === 'firstName') {
      orderBy.firstName = sortOrder;
    } else {
      orderBy.createdAt = sortOrder;
    }

    const [agents, total] = await Promise.all([
      this.prisma.agentProfile.findMany({
        where,
        skip,
        take: limit,
        orderBy,
        include: {
          user: {
            select: {
              id: true,
              email: true,
              avatar: true,
            },
          },
          agentType: true,
        },
      }),
      this.prisma.agentProfile.count({ where }),
    ]);

    return {
      data: agents,
      meta: {
        total,
        page,
        limit,
        totalPages: Math.ceil(total / limit),
      },
    };
  }

  async getFeaturedAgents(limit = 10) {
    const agents = await this.prisma.agentProfile.findMany({
      where: {
        isVerified: true,
        isFeatured: true,
      },
      take: limit,
      orderBy: [{ averageRating: 'desc' }, { totalReviews: 'desc' }],
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    return agents;
  }

  async getTopRatedAgents(limit = 10) {
    const agents = await this.prisma.agentProfile.findMany({
      where: {
        isVerified: true,
        totalReviews: { gte: 5 },
      },
      take: limit,
      orderBy: [{ averageRating: 'desc' }, { totalReviews: 'desc' }],
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    return agents;
  }

  // Admin methods
  async adminUpdateProfile(profileId: string, dto: UpdateAgentProfileDto) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: profileId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    const updatedProfile = await this.prisma.agentProfile.update({
      where: { id: profileId },
      data: dto,
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
        agentType: true,
      },
    });

    return updatedProfile;
  }

  async adminDeleteProfile(profileId: string) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: profileId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    await this.prisma.agentProfile.delete({
      where: { id: profileId },
    });

    return { message: 'Agent profile deleted successfully' };
  }

  async adminVerifyAgent(
    profileId: string,
    data: {
      status: VerificationStatus;
      note?: string;
      adminId: string;
    },
  ) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: profileId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    const updateData: Prisma.AgentProfileUpdateInput = {
      verificationStatus: data.status,
      verificationNote: data.note || null,
    };

    if (data.status === VerificationStatus.APPROVED) {
      updateData.isVerified = true;
      updateData.verifiedAt = new Date();
      updateData.verifiedBy = data.adminId;
    } else if (data.status === VerificationStatus.REJECTED) {
      updateData.isVerified = false;
      updateData.verifiedAt = null;
      updateData.verifiedBy = null;
    }

    const updatedProfile = await this.prisma.agentProfile.update({
      where: { id: profileId },
      data: updateData,
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
      },
    });

    return updatedProfile;
  }

  async getVerificationDocuments(agentProfileId: string) {
    // Find the upload-documents section field
    const field = await this.prisma.profileField.findFirst({
      where: {
        section: { slug: 'upload-documents' },
        slug: 'documents',
      },
    });

    if (!field) return [];

    const fieldValue = await this.prisma.agentProfileFieldValue.findUnique({
      where: {
        agentProfileId_fieldId: { agentProfileId, fieldId: field.id },
      },
    });

    return fieldValue?.jsonValue || [];
  }

  async adminSetFeatured(profileId: string, isFeatured: boolean) {
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: profileId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    const updatedProfile = await this.prisma.agentProfile.update({
      where: { id: profileId },
      data: { isFeatured },
      include: {
        user: {
          select: {
            id: true,
            email: true,
            avatar: true,
          },
        },
      },
    });

    return updatedProfile;
  }

  async getAllAgentsAdmin(dto: SearchAgentsDto) {
    // Same as searchAgents but returns all data for admin
    return this.searchAgents(dto);
  }

  // Field Values methods
  async saveFieldValues(userId: string, dto: SaveFieldValuesDto) {
    // Get agent profile
    const profile = await this.prisma.agentProfile.findUnique({
      where: { userId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    // Process each field value
    const results: Array<{
      id: string;
      agentProfileId: string;
      fieldId: string;
      textValue: string | null;
      numberValue: number | null;
      booleanValue: boolean | null;
      jsonValue: Prisma.JsonValue;
      dateValue: Date | null;
      createdAt: Date;
      updatedAt: Date;
      field: {
        id: string;
        slug: string;
        name: string;
        fieldType: string;
      };
    }> = [];
    for (const fieldValue of dto.fieldValues) {
      // Find the field by slug
      const field = await this.prisma.profileField.findFirst({
        where: { slug: fieldValue.fieldSlug },
        include: { section: true },
      });

      if (!field) {
        // Skip fields that don't exist
        continue;
      }

      // Determine which column to use based on value type and field type
      const valueData = this.getValueData(field.fieldType, fieldValue.value);

      // Upsert the field value
      const result = await this.prisma.agentProfileFieldValue.upsert({
        where: {
          agentProfileId_fieldId: {
            agentProfileId: profile.id,
            fieldId: field.id,
          },
        },
        create: {
          agentProfileId: profile.id,
          fieldId: field.id,
          ...valueData,
        },
        update: valueData,
        include: {
          field: {
            select: {
              id: true,
              slug: true,
              name: true,
              fieldType: true,
            },
          },
        },
      });

      results.push(result);
    }

    return {
      message: 'Field values saved successfully',
      savedCount: results.length,
      data: results,
    };
  }

  async getFieldValues(userId: string) {
    // Get agent profile
    const profile = await this.prisma.agentProfile.findUnique({
      where: { userId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    // Get all field values for this profile
    const fieldValues = await this.prisma.agentProfileFieldValue.findMany({
      where: { agentProfileId: profile.id },
      include: {
        field: {
          select: {
            id: true,
            slug: true,
            name: true,
            fieldType: true,
            section: {
              select: {
                id: true,
                slug: true,
                name: true,
              },
            },
          },
        },
      },
    });

    // Transform to a more usable format
    const transformedValues = fieldValues.map((fv) => ({
      fieldSlug: fv.field.slug,
      fieldName: fv.field.name,
      fieldType: fv.field.fieldType,
      sectionSlug: fv.field.section.slug,
      sectionName: fv.field.section.name,
      value: this.extractValue(fv),
    }));

    return {
      agentProfileId: profile.id,
      fieldValues: transformedValues,
    };
  }

  async getFieldValuesByAgentId(agentId: string) {
    // Get agent profile by ID
    const profile = await this.prisma.agentProfile.findUnique({
      where: { id: agentId },
    });

    if (!profile) {
      throw new NotFoundException('Agent profile not found');
    }

    // Get all field values for this profile
    const fieldValues = await this.prisma.agentProfileFieldValue.findMany({
      where: { agentProfileId: profile.id },
      include: {
        field: {
          select: {
            id: true,
            slug: true,
            name: true,
            fieldType: true,
            section: {
              select: {
                id: true,
                slug: true,
                name: true,
              },
            },
          },
        },
      },
    });

    // Transform to a more usable format
    const transformedValues = fieldValues.map((fv) => ({
      fieldSlug: fv.field.slug,
      fieldName: fv.field.name,
      fieldType: fv.field.fieldType,
      sectionSlug: fv.field.section.slug,
      sectionName: fv.field.section.name,
      value: this.extractValue(fv),
    }));

    return {
      agentProfileId: profile.id,
      fieldValues: transformedValues,
    };
  }

  private getValueData(
    fieldType: string,
    value: string | number | boolean | string[] | Record<string, unknown> | null,
  ): {
    textValue: string | null;
    numberValue: number | null;
    booleanValue: boolean | null;
    jsonValue: PrismaTypes.InputJsonValue | typeof PrismaTypes.DbNull;
    dateValue: Date | null;
  } {
    // Reset all value columns
    const valueData: {
      textValue: string | null;
      numberValue: number | null;
      booleanValue: boolean | null;
      jsonValue: PrismaTypes.InputJsonValue | typeof PrismaTypes.DbNull;
      dateValue: Date | null;
    } = {
      textValue: null,
      numberValue: null,
      booleanValue: null,
      jsonValue: PrismaTypes.DbNull,
      dateValue: null,
    };

    if (value === null || value === undefined) {
      return valueData;
    }

    switch (fieldType) {
      case 'TEXT':
      case 'TEXTAREA':
        valueData.textValue = String(value);
        break;
      case 'NUMBER':
      case 'RANGE':
        valueData.numberValue =
          typeof value === 'number' ? value : parseFloat(String(value));
        break;
      case 'CHECKBOX':
        valueData.booleanValue =
          typeof value === 'boolean' ? value : value === 'true';
        break;
      case 'DATE':
        valueData.dateValue = new Date(String(value));
        break;
      case 'SELECT':
      case 'RADIO':
        // Single selection - store as text
        valueData.textValue = String(value);
        break;
      case 'MULTI_SELECT':
      case 'CHECKBOX_GROUP':
      case 'TAG_INPUT':
      case 'FILE':
      case 'FILE_UPLOAD':
      case 'REPEATER':
        // Arrays and complex objects - store as JSON
        valueData.jsonValue = value as PrismaTypes.InputJsonValue;
        break;
      default:
        // Default to JSON for unknown types
        if (typeof value === 'object') {
          valueData.jsonValue = value as PrismaTypes.InputJsonValue;
        } else {
          valueData.textValue = String(value);
        }
    }

    return valueData;
  }

  private extractValue(fieldValue: {
    textValue: string | null;
    numberValue: number | null;
    booleanValue: boolean | null;
    jsonValue: unknown;
    dateValue: Date | null;
    field: { fieldType: string };
  }): unknown {
    const { fieldType } = fieldValue.field;

    switch (fieldType) {
      case 'TEXT':
      case 'TEXTAREA':
      case 'SELECT':
      case 'RADIO':
        return fieldValue.textValue;
      case 'NUMBER':
      case 'RANGE':
        return fieldValue.numberValue;
      case 'CHECKBOX':
        return fieldValue.booleanValue;
      case 'DATE':
        return fieldValue.dateValue?.toISOString();
      case 'MULTI_SELECT':
      case 'CHECKBOX_GROUP':
      case 'TAG_INPUT':
      case 'FILE':
      case 'FILE_UPLOAD':
      case 'REPEATER':
        return fieldValue.jsonValue;
      default:
        // Return first non-null value
        return (
          fieldValue.jsonValue ??
          fieldValue.textValue ??
          fieldValue.numberValue ??
          fieldValue.booleanValue ??
          fieldValue.dateValue?.toISOString()
        );
    }
  }
}