import CasePathsCore
import Foundation
@preconcurrency import URLRouting

public enum SiteRoute: Sendable {
  case api(ApiRoute)
  case health
  case view(ViewRoute)

  public static let router = OneOf {
    Route(.case(Self.view)) { ViewRoute.router }
    Route(.case(Self.health)) {
      Path { "health" }
      Method.get
    }
    Route(.case(Self.api)) { ApiRoute.router }
  }
}

public enum ApiRoute: Sendable {

  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 {
    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 {
    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 logout.
  public enum UserApiRoute: Sendable {
    case create(User.Create)
    case delete(id: User.ID)
    case get(id: User.ID)
    case index
    case login(User.Login)
    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.login)) {
        Path { rootPath }
        Method.post
        Body(.json(User.Login.self))
      }
      Route(.case(Self.update(id:updates:))) {
        Path { rootPath; User.ID.parser() }
        // TODO: Use put or patch.
        Method.post
        Body(.json(User.Update.self))
      }
    }
  }

  public enum VendorApiRoute: Sendable {
    case create(Vendor.Create)
    case delete(id: Vendor.ID)
    case get(id: Vendor.ID)
    case index(withBranches: Bool?)
    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 {
          Field("branches", default: nil) {
            Optionally { Bool.parser() }
          }
        }
      }
      Route(.case(Self.update(id:updates:))) {
        Path { rootPath; Vendor.ID.parser() }
        Method.put
        Body(.json(Vendor.Update.self))
      }
    }
  }

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

public enum ViewRoute: Sendable {

  case employee(EmployeeRoute)
  case login
  case purchaseOrder(PurchaseOrderRoute)
  case select(SelectRoute)
  case user(UserRoute)
  case vendor(VendorRoute)

  public static let router = OneOf {
    Route(.case(Self.employee)) { EmployeeRoute.router }
    Route(.case(Self.login)) {
      Path { "login" }
      Method.get
    }
    Route(.case(Self.purchaseOrder)) { PurchaseOrderRoute.router }
    Route(.case(Self.select)) { SelectRoute.router }
    Route(.case(Self.user)) { UserRoute.router }
    Route(.case(Self.vendor)) { VendorRoute.router }
  }

  public enum EmployeeRoute: Sendable {
    case form
    case shared(ApiRoute.EmployeeApiRoute)

    static let rootPath = "employees"

    public static let router = OneOf {
      Route(.case(Self.form)) {
        Path { rootPath; "create" }
        Method.get
      }
      Route(.case(Self.shared)) {
        ApiRoute.EmployeeApiRoute.router
      }
    }
  }

  public enum PurchaseOrderRoute: Sendable {
    case form
    case search(Search)
    case shared(ApiRoute.PurchaseOrderApiRoute)

    static let rootPath = "purchase-orders"

    public static let router = OneOf {
      Route(.case(Self.form)) {
        Path { rootPath; "create" }
        Method.get
      }
      Route(.case(Self.search)) {
        Search.router
      }
      Route(.case(Self.shared)) {
        ApiRoute.PurchaseOrderApiRoute.router
      }
    }

    public enum Search: Sendable {
      case index(context: Context, table: Bool?)
      case search(Request)

      static let rootPath = Path { "purchase-orders"; "search" }

      static let router = OneOf {
        Route(.case(Search.index(context:table:))) {
          rootPath
          Method.get
          Query {
            Field("context", default: .employee) { Search.Context.parser() }
            Field("table", default: nil) { Optionally { Bool.parser() } }
          }
        }
        Route(.case(Search.search)) {
          rootPath
          Method.post
          Body(.json(Search.Request.self))
        }
      }

      public enum Context: String, Codable, CaseIterable, Sendable {
        case employee
        case customer
        case vendor
      }

      public struct Request: Codable, Sendable {
        public let context: Context
        public let createdForID: Employee.ID?
        public let customerSearch: String?
        public let vendorBranchID: VendorBranch.ID?

        public init(
          context: Context,
          createdForID: Employee.ID? = nil,
          customerSearch: String? = nil,
          vendorBranchID: VendorBranch.ID? = nil
        ) {
          self.context = context
          self.createdForID = createdForID
          self.customerSearch = customerSearch
          self.vendorBranchID = vendorBranchID
        }
      }

    }
  }

  public enum SelectRoute: Sendable {
    case employee(context: Context)
    case vendorBranches(context: Context)

    public enum Context: String, Codable, Sendable, CaseIterable {
      case purchaseOrderForm
      case purchaseOrderSearch
    }

    static let rootPath = "select"

    public static let router = OneOf {
      Route(.case(Self.employee(context:))) {
        Path { rootPath; "employee" }
        Method.get
        Query {
          Field("context") { Context.parser() }
        }
      }
      Route(.case(Self.vendorBranches(context:))) {
        Path { rootPath; "vendor-branches" }
        Method.get
        Query {
          Field("context") { Context.parser() }
        }
      }
    }
  }

  public enum UserRoute: Sendable {
    case form
    case shared(ApiRoute.UserApiRoute)

    static let rootPath = "users"

    public static let router = OneOf {
      Route(.case(Self.form)) {
        Path { rootPath; "create" }
        Method.get
      }
      Route(.case(Self.shared)) {
        ApiRoute.UserApiRoute.router
      }
    }
  }

  public enum VendorRoute: Sendable {
    case createBranch(VendorBranch.Create)
    case form
    case shared(ApiRoute.VendorApiRoute)

    static let rootPath = "vendors"

    public static let router = OneOf {
      Route(.case(Self.createBranch)) {
        Path { rootPath; "branches" }
        Method.post
        Body(.json(VendorBranch.Create.self))
      }
      Route(.case(Self.form)) {
        Path { rootPath; "create" }
        Method.get
      }
      Route(.case(Self.shared)) {
        ApiRoute.VendorApiRoute.router
      }
    }
  }
}