const couchdbService = require("../services/couchdbService");

class Street {
  constructor(data) {
    // Validate required fields
    if (!data.name) {
      throw new Error('Name is required');
    }
    if (!data.location) {
      throw new Error('Location is required');
    }

    this._id = data._id || `street_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
    this._rev = data._rev || null;
    this.type = "street";
    this.name = data.name;
    this.location = data.location;
    this.adoptedBy = data.adoptedBy || null;
    this.status = data.status || "available";
    this.createdAt = data.createdAt || new Date().toISOString();
    this.updatedAt = data.updatedAt || new Date().toISOString();
    this.stats = data.stats || {
      completedTasksCount: 0,
      reportsCount: 0,
      openReportsCount: 0
    };
  }

  // Static methods for MongoDB-like interface
  static async find(filter = {}) {
    try {
      await couchdbService.initialize();
      
      // Extract pagination and sorting options from filter
      const { sort, skip, limit, ...filterOptions } = filter;
      
      // Convert MongoDB filter to CouchDB selector
      const selector = { type: "street", ...filterOptions };
      
      // Handle special cases
      if (filterOptions._id) {
        selector._id = filterOptions._id;
      }
      
      if (filterOptions.status) {
        selector.status = filterOptions.status;
      }
      
      if (filterOptions.adoptedBy) {
        selector["adoptedBy.userId"] = filterOptions.adoptedBy;
      }

      const query = {
        selector,
        sort: sort || [{ name: "asc" }]
      };

      // Add pagination if specified
      if (skip !== undefined) query.skip = skip;
      if (limit !== undefined) query.limit = limit;

      console.log("Street.find query:", JSON.stringify(query, null, 2));
      const docs = await couchdbService.find(query);
      
      // Convert to Street instances
      return docs.map(doc => new Street(doc));
    } catch (error) {
      console.error("Error finding streets:", error.message);
      throw error;
    }
  }

  static async findById(id) {
    try {
      await couchdbService.initialize();
      const doc = await couchdbService.getDocument(id);
      
      if (!doc || doc.type !== "street") {
        return null;
      }
      
      return new Street(doc);
    } catch (error) {
      if (error.statusCode === 404) {
        return null;
      }
      console.error("Error finding street by ID:", error.message);
      throw error;
    }
  }

  static async findOne(filter = {}) {
    try {
      const streets = await Street.find(filter);
      return streets.length > 0 ? streets[0] : null;
    } catch (error) {
      console.error("Error finding one street:", error.message);
      throw error;
    }
  }

  static async countDocuments(filter = {}) {
    try {
      await couchdbService.initialize();
      
      const selector = { type: "street", ...filter };
      
      // Use Mango query with count
      const query = {
        selector,
        fields: ["_id"]
      };

      const docs = await couchdbService.find(query);
      return docs.length;
    } catch (error) {
      console.error("Error counting streets:", error.message);
      throw error;
    }
  }

  static async create(data) {
    try {
      await couchdbService.initialize();
      
      const street = new Street(data);
      const doc = await couchdbService.createDocument(street.toJSON());
      
      return new Street(doc);
    } catch (error) {
      console.error("Error creating street:", error.message);
      throw error;
    }
  }

  static async deleteMany(filter = {}) {
    try {
      await couchdbService.initialize();
      
      const streets = await Street.find(filter);
      const deletePromises = streets.map(street => street.delete());
      
      await Promise.all(deletePromises);
      return { deletedCount: streets.length };
    } catch (error) {
      console.error("Error deleting many streets:", error.message);
      throw error;
    }
  }

  // Instance methods
  async save() {
    try {
      await couchdbService.initialize();
      
      this.updatedAt = new Date().toISOString();
      
      if (this._id && this._rev) {
        // Update existing document
        const doc = await couchdbService.updateDocument(this.toJSON());
        this._rev = doc._rev;
      } else {
        // Create new document
        const doc = await couchdbService.createDocument(this.toJSON());
        this._id = doc._id;
        this._rev = doc._rev;
      }
      
      return this;
    } catch (error) {
      console.error("Error saving street:", error.message);
      throw error;
    }
  }

  async delete() {
    try {
      await couchdbService.initialize();
      
      if (!this._id || !this._rev) {
        throw new Error("Street must have _id and _rev to delete");
      }

      // Handle cascade operations
      await this._handleCascadeDelete();

      await couchdbService.deleteDocument(this._id, this._rev);
      return this;
    } catch (error) {
      console.error("Error deleting street:", error.message);
      throw error;
    }
  }

  async _handleCascadeDelete() {
    try {
      // Remove street from user's adoptedStreets
      if (this.adoptedBy && this.adoptedBy.userId) {
        const User = require("./User");
        const user = await User.findById(this.adoptedBy.userId);
        
        if (user) {
          user.adoptedStreets = user.adoptedStreets.filter(id => id !== this._id);
          await user.save();
        }
      }

      // Delete all tasks associated with this street
      const Task = require("./Task");
      await Task.deleteMany({ "street.streetId": this._id });
    } catch (error) {
      console.error("Error handling cascade delete:", error.message);
      throw error;
    }
  }

  // Populate method for compatibility
  async populate(path) {
    if (path === "adoptedBy" && this.adoptedBy && this.adoptedBy.userId) {
      const User = require("./User");
      const user = await User.findById(this.adoptedBy.userId);
      
      if (user) {
        this.adoptedBy = {
          userId: user._id,
          name: user.name,
          profilePicture: user.profilePicture
        };
      }
    }
    
    return this;
  }

  // Geospatial query helper
  static async findNearby(coordinates, maxDistance = 1000) {
    try {
      await couchdbService.initialize();
      
      // For CouchDB, we'll use a bounding box approach
      // Calculate bounding box around the point
      const [lng, lat] = coordinates;
      const earthRadius = 6371000; // Earth's radius in meters
      const latDelta = (maxDistance / earthRadius) * (180 / Math.PI);
      const lngDelta = (maxDistance / earthRadius) * (180 / Math.PI) / Math.cos(lat * Math.PI / 180);

      const bounds = [
        [lng - lngDelta, lat - latDelta], // Southwest corner
        [lng + lngDelta, lat + latDelta]  // Northeast corner
      ];

      const streets = await couchdbService.findStreetsByLocation(bounds);
      return streets.map(doc => new Street(doc));
    } catch (error) {
      console.error("Error finding nearby streets:", error.message);
      throw error;
    }
  }

  // Convert to plain object
  toJSON() {
    return {
      _id: this._id,
      _rev: this._rev,
      type: this.type,
      name: this.name,
      location: this.location,
      adoptedBy: this.adoptedBy,
      status: this.status,
      createdAt: this.createdAt,
      updatedAt: this.updatedAt,
      stats: this.stats
    };
  }

  // Convert to MongoDB-like format for API responses
  toObject() {
    const obj = this.toJSON();
    
    // Remove CouchDB-specific fields for API compatibility
    delete obj._rev;
    delete obj.type;
    
    // Add _id field for compatibility
    if (obj._id) {
      obj.id = obj._id;
    }
    
    return obj;
  }
}

// Export both the class and static methods for compatibility
module.exports = Street;