import { Injectable, NotFoundException } from "@nestjs/common";
import { Prisma } from "@prisma/client";
import { PrismaService } from "../prisma/prisma.service";
import { ActivityService } from "../activity/activity.service";
import { IdeaStatus } from "@prisma/client";
import type {
  CreateIdeaDto,
  CaptureIdeaDto,
  UpdateIdeaDto,
  QueryIdeasDto,
} from "./dto";

/**
 * Service for managing ideas
 */
@Injectable()
export class IdeasService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly activityService: ActivityService
  ) {}

  /**
   * Create a new idea
   */
  async create(
    workspaceId: string,
    userId: string,
    createIdeaDto: CreateIdeaDto
  ) {
    const data: any = {
      ...createIdeaDto,
      workspaceId,
      creatorId: userId,
      status: createIdeaDto.status || IdeaStatus.CAPTURED,
      priority: createIdeaDto.priority || "MEDIUM",
      tags: createIdeaDto.tags || [],
      metadata: createIdeaDto.metadata || {},
    };

    const idea = await this.prisma.idea.create({
      data,
      include: {
        creator: {
          select: { id: true, name: true, email: true },
        },
        domain: {
          select: { id: true, name: true, color: true },
        },
        project: {
          select: { id: true, name: true, color: true },
        },
      },
    });

    // Log activity
    await this.activityService.logIdeaCreated(
      workspaceId,
      userId,
      idea.id,
      {
        title: idea.title || "Untitled",
      }
    );

    return idea;
  }

  /**
   * Quick capture - create an idea with minimal fields
   * Optimized for rapid idea capture from the front-end
   */
  async capture(
    workspaceId: string,
    userId: string,
    captureIdeaDto: CaptureIdeaDto
  ) {
    const data: any = {
      workspaceId,
      creatorId: userId,
      content: captureIdeaDto.content,
      title: captureIdeaDto.title,
      status: IdeaStatus.CAPTURED,
      priority: "MEDIUM",
      tags: [],
      metadata: {},
    };

    const idea = await this.prisma.idea.create({
      data,
      include: {
        creator: {
          select: { id: true, name: true, email: true },
        },
      },
    });

    // Log activity
    await this.activityService.logIdeaCreated(
      workspaceId,
      userId,
      idea.id,
      {
        quickCapture: true,
        title: idea.title || "Untitled",
      }
    );

    return idea;
  }

  /**
   * Get paginated ideas with filters
   */
  async findAll(query: QueryIdeasDto) {
    const page = query.page || 1;
    const limit = query.limit || 50;
    const skip = (page - 1) * limit;

    // Build where clause
    const where: any = {
      workspaceId: query.workspaceId,
    };

    if (query.status) {
      where.status = query.status;
    }

    if (query.domainId) {
      where.domainId = query.domainId;
    }

    if (query.projectId) {
      where.projectId = query.projectId;
    }

    if (query.category) {
      where.category = query.category;
    }

    // Add search filter if provided
    if (query.search) {
      where.OR = [
        { title: { contains: query.search, mode: "insensitive" } },
        { content: { contains: query.search, mode: "insensitive" } },
      ];
    }

    // Execute queries in parallel
    const [data, total] = await Promise.all([
      this.prisma.idea.findMany({
        where,
        include: {
          creator: {
            select: { id: true, name: true, email: true },
          },
          domain: {
            select: { id: true, name: true, color: true },
          },
          project: {
            select: { id: true, name: true, color: true },
          },
        },
        orderBy: {
          createdAt: "desc",
        },
        skip,
        take: limit,
      }),
      this.prisma.idea.count({ where }),
    ]);

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

  /**
   * Get a single idea by ID
   */
  async findOne(id: string, workspaceId: string) {
    const idea = await this.prisma.idea.findUnique({
      where: {
        id,
        workspaceId,
      },
      include: {
        creator: {
          select: { id: true, name: true, email: true },
        },
        domain: {
          select: { id: true, name: true, color: true },
        },
        project: {
          select: { id: true, name: true, color: true },
        },
      },
    });

    if (!idea) {
      throw new NotFoundException(`Idea with ID ${id} not found`);
    }

    return idea;
  }

  /**
   * Update an idea
   */
  async update(
    id: string,
    workspaceId: string,
    userId: string,
    updateIdeaDto: UpdateIdeaDto
  ) {
    // Verify idea exists
    const existingIdea = await this.prisma.idea.findUnique({
      where: { id, workspaceId },
    });

    if (!existingIdea) {
      throw new NotFoundException(`Idea with ID ${id} not found`);
    }

    const idea = await this.prisma.idea.update({
      where: {
        id,
        workspaceId,
      },
      data: updateIdeaDto as any,
      include: {
        creator: {
          select: { id: true, name: true, email: true },
        },
        domain: {
          select: { id: true, name: true, color: true },
        },
        project: {
          select: { id: true, name: true, color: true },
        },
      },
    });

    // Log activity
    await this.activityService.logIdeaUpdated(
      workspaceId,
      userId,
      id,
      {
        changes: updateIdeaDto as Prisma.JsonValue,
      }
    );

    return idea;
  }

  /**
   * Delete an idea
   */
  async remove(id: string, workspaceId: string, userId: string) {
    // Verify idea exists
    const idea = await this.prisma.idea.findUnique({
      where: { id, workspaceId },
    });

    if (!idea) {
      throw new NotFoundException(`Idea with ID ${id} not found`);
    }

    await this.prisma.idea.delete({
      where: {
        id,
        workspaceId,
      },
    });

    // Log activity
    await this.activityService.logIdeaDeleted(
      workspaceId,
      userId,
      id,
      {
        title: idea.title || "Untitled",
      }
    );
  }
}