import Dependencies
import DependenciesMacros
import Fluent
import Vapor

public extension DependencyValues {
  var vendorBranches: VendorBranchDB {
    get { self[VendorBranchDB.self] }
    set { self[VendorBranchDB.self] = newValue }
  }
}

@DependencyClient
public struct VendorBranchDB: Sendable {
  var create: @Sendable (VendorBranch.Create, Vendor.IDValue) async throws -> VendorBranch.DTO
  var delete: @Sendable (VendorBranch.IDValue) async throws -> Void
  var fetchAll: @Sendable (Bool) async throws -> [VendorBranch.DTO]
  var fetchForVendor: @Sendable (Vendor.IDValue) async throws -> [VendorBranch.DTO]
  var get: @Sendable (VendorBranch.IDValue) async throws -> VendorBranch.DTO?
  var update: @Sendable (VendorBranch.IDValue, VendorBranch.Update) async throws -> VendorBranch.DTO

  func fetchAll() async throws -> [VendorBranch.DTO] {
    try await fetchAll(false)
  }
}

extension VendorBranchDB: TestDependencyKey {
  public static let testValue: VendorBranchDB = Self()

  static func live(database db: any Database) -> Self {
    .init(
      create: { model, vendorID in
        let branch = model.toModel()
        guard let vendor = try await Vendor.find(vendorID, on: db) else {
          throw Abort(.badRequest, reason: "Vendor does not exist.")
        }
        try await vendor.$branches.create(branch, on: db)
        return branch.toDTO()
      },
      delete: { id in
        guard let branch = try await VendorBranch.find(id, on: db) else {
          throw Abort(.notFound)
        }
        try await branch.delete(on: db)
      },
      fetchAll: { withVendor in
        var query = VendorBranch.query(on: db)
        if withVendor == true {
          query = query.with(\.$vendor)
        }
        return try await query.all().map { $0.toDTO() }

      },
      fetchForVendor: { vendorID in
        guard let vendor = try await Vendor.query(on: db)
          .filter(\.$id == vendorID)
          .with(\.$branches)
          .first()
        else {
          throw Abort(.notFound)
        }

        return vendor.branches.map { $0.toDTO() }

      },
      get: { id in

        try await VendorBranch.find(id, on: db).map { $0.toDTO() }
      },
      update: { id, updates in
        guard let branch = try await VendorBranch.find(id, on: db) else {
          throw Abort(.notFound)
        }
        branch.applyUpdates(updates)
        try await branch.save(on: db)
        return branch.toDTO()
      }
    )
  }
}