import CasePathsCore
import Foundation
@preconcurrency import URLRouting

public enum ApiRoute: Sendable, Equatable {

  case employee(EmployeeApiRoute)
  case purchaseOrder(PurchaseOrderApiRoute)
  case user(UserApiRoute)
  case vendor(VendorApiRoute)
  case vendorBranch(VendorBranchApiRoute)

  static let rootPath = Path { "api"; "v1" }

  public static let router = OneOf {
    Route(.case(Self.employee)) {
      rootPath
      EmployeeApiRoute.router
    }
    Route(.case(Self.purchaseOrder)) {
      rootPath
      PurchaseOrderApiRoute.router
    }
    Route(.case(Self.user)) {
      rootPath
      UserApiRoute.router
    }
    Route(.case(Self.vendor)) {
      rootPath
      VendorApiRoute.router
    }
    Route(.case(Self.vendorBranch)) {
      rootPath
      VendorBranchApiRoute.router
    }
  }

  public enum EmployeeApiRoute: Sendable, Equatable {
    case create(Employee.Create)
    case delete(id: Employee.ID)
    case get(id: Employee.ID)
    case index
    case update(id: Employee.ID, updates: Employee.Update)

    static let rootPath = "employees"

    public static let router = OneOf {
      Route(.case(Self.create)) {
        Path { rootPath }
        Method.post
        Body(.json(Employee.Create.self))
      }
      Route(.case(Self.index)) {
        Path { rootPath }
        Method.get
      }
      Route(.case(Self.delete(id:))) {
        Path { rootPath; UUID.parser() }
        Method.delete
      }
      Route(.case(Self.get(id:))) {
        Path { rootPath; UUID.parser() }
        Method.get
      }
      Route(.case(Self.update(id:updates:))) {
        Path { rootPath; UUID.parser() }
        Method.put
        Body(.json(Employee.Update.self))
      }
    }
  }

  public enum PurchaseOrderApiRoute: Sendable, Equatable {
    case create(PurchaseOrder.Create)
    case delete(id: PurchaseOrder.ID)
    case get(id: PurchaseOrder.ID)
    case index
    case page(page: Int, limit: Int)

    static let rootPath = "purchase-orders"

    public static let router = OneOf {
      Route(.case(Self.create)) {
        Path { rootPath }
        Method.post
        Body(.json(PurchaseOrder.Create.self))
      }
      Route(.case(Self.delete(id:))) {
        Path { rootPath; Digits() }
        Method.delete
      }
      Route(.case(Self.get(id:))) {
        Path { rootPath; Digits() }
        Method.get
      }
      Route(.case(Self.index)) {
        Path { rootPath }
        Method.get
      }
      Route(.case(Self.page(page:limit:))) {
        Path { rootPath; "next" }
        Method.get
        Query {
          Field("page", default: 1) { Digits() }
          Field("limit", default: 25) { Digits() }
        }
      }
    }
  }

  // TODO: Add login / logout.
  public enum UserApiRoute: Sendable, Equatable {
    case create(User.Create)
    case delete(id: User.ID)
    case get(id: User.ID)
    case index
    case update(id: User.ID, updates: User.Update)

    static let rootPath = "users"

    public static let router = OneOf {
      Route(.case(Self.create)) {
        Path { rootPath }
        Method.post
        Body(.json(User.Create.self))
      }
      Route(.case(Self.delete(id:))) {
        Path { rootPath; User.ID.parser() }
        Method.delete
      }
      Route(.case(Self.get(id:))) {
        Path { rootPath; User.ID.parser() }
        Method.get
      }
      Route(.case(Self.index)) {
        Path { rootPath }
        Method.get
      }
      Route(.case(Self.update(id:updates:))) {
        Path { rootPath; User.ID.parser() }
        Method.patch
        Body(.json(User.Update.self))
      }
    }
  }

  public enum VendorApiRoute: Sendable, Equatable {
    case index(withBranches: Bool? = nil)
    case create(Vendor.Create)
    case delete(id: Vendor.ID)
    case get(id: Vendor.ID)
    case update(id: Vendor.ID, updates: Vendor.Update)

    static let rootPath = "vendors"

    public static let router = OneOf {
      Route(.case(Self.create)) {
        Path { rootPath }
        Method.post
        Body(.json(Vendor.Create.self))
      }
      Route(.case(Self.delete(id:))) {
        Path { rootPath; Vendor.ID.parser() }
        Method.delete
      }
      Route(.case(Self.get(id:))) {
        Path { rootPath; Vendor.ID.parser() }
        Method.get
      }
      Route(.case(Self.index(withBranches:))) {
        Path { rootPath }
        Method.get
        Query {
          Optionally {
            Field("branches", default: nil) {
              Bool.parser()
            }
          }
        }
      }
      Route(.case(Self.update(id:updates:))) {
        Path { rootPath; Vendor.ID.parser() }
        Method.put
        Body(.json(Vendor.Update.self))
      }
    }
  }

  public enum VendorBranchApiRoute: Sendable, Equatable {
    case create(VendorBranch.Create)
    case delete(id: VendorBranch.ID)
    case get(id: VendorBranch.ID)
    case index(for: Vendor.ID? = nil)
    case update(id: VendorBranch.ID, updates: VendorBranch.Update)

    public static let router = OneOf {
      Route(.case(Self.create)) {
        Path { "vendors"; "branches" }
        Method.post
        Body(.json(VendorBranch.Create.self))
      }
      Route(.case(Self.delete(id:))) {
        Path { "vendors"; "branches"; VendorBranch.ID.parser() }
        Method.delete
      }

      Route(.case(Self.get(id:))) {
        Path { "vendors"; "branches"; VendorBranch.ID.parser() }
        Method.get
      }
      Route(.case(Self.index(for:))) {
        Path { "vendors"; "branches" }
        Method.get
        Query {
          Optionally { Field("vendorID", default: nil) { VendorBranch.ID.parser() } }
        }
      }
      Route(.case(Self.update(id:updates:))) {
        Path { "vendors"; "branches"; VendorBranch.ID.parser() }
        Method.put
        Body(.json(VendorBranch.Update.self))
      }
    }
  }
}