import Dependencies
import Elementary
import Fluent
import SharedModels
import Vapor
import VaporElementary

struct PurchaseOrderViewController: RouteCollection {
  @Dependency(\.database.employees) var employees
  @Dependency(\.database.vendorBranches) var vendorBranches
  @Dependency(\.database.purchaseOrders) var purchaseOrders

  func boot(routes: any RoutesBuilder) throws {
    let route = routes.protected.grouped("purchase-orders")
    route.get(use: index)
    route.get("next", use: nextPage)
    route.post(use: create(req:))
    route.group("create") {
      $0.get(use: form)
    }
    route.group(":id") {
      $0.get(use: get)
    }
  }

  @Sendable
  func index(req: Request) async throws -> HTMLResponse {
    let page = try? req.query.decode(IndexQuery.self)
    return try await req.render { try await mainPage(PurchaseOrderForm(), page: page ?? .default) }
  }

  @Sendable
  func nextPage(req: Request) async throws -> HTMLResponse {
    let query = try req.query.decode(IndexQuery.self)
    let page = try await purchaseOrders.fetchPage(.init(page: query.page, per: query.limit))
    return await req.render { PurchaseOrderTable.Rows(page: page) }
  }

  @Sendable
  func form(req: Request) async throws -> HTMLResponse {
    guard req.isHtmxRequest else {
      return try await req.render {
        try await mainPage(PurchaseOrderForm(shouldShow: true), page: .default)
      }
    }
    return await req.render { PurchaseOrderForm(shouldShow: true) }
  }

  @Sendable
  func get(req: Request) async throws -> HTMLResponse {
    let purchaseOrder = try await purchaseOrders.get(req.ensureIDPathComponent(as: Int.self))
    let form = PurchaseOrderForm(purchaseOrder: purchaseOrder, shouldShow: true)
    guard req.isHtmxRequest else {
      return try await req.render {
        try await mainPage(form, page: .default)
      }
    }
    return await req.render { form }
  }

  @Sendable
  func create(req: Request) async throws -> HTMLResponse {
    let create = try req.content.decode(CreateContext.self).toIntermediate()
    let user = try req.auth.require(User.self)
    let purchaseOrder = try await purchaseOrders.create(create.toCreate(createdByID: user.id))
    return await req.render { PurchaseOrderTable.Row(purchaseOrder: purchaseOrder) }
  }

  // @Sendable
  // func postSearch(req: Request) async throws -> HTMLResponse {
  //   let context = try req.content.decode(PurchaseOrderSearchContent.self)
  //   let results = try await purchaseOrders.search(context.toDatabaseQuery(), .init(page: 1, per: 25))
  //   return await req.render { PurchaseOrderTable(page: results, context: .search, searchContext: nil) }
  // }

  // Show the form to generate a search query.
  // @Sendable
  // func getSearch(req: Request) async throws -> HTMLResponse {
  //   // TODO: Need to handle updating the form.
  //   return await req.render {
  //     MainPage(displayNav: true, route: .purchaseOrders) {
  //       div(.class("container"), .id("purchase-order-content")) {
  //         PurchaseOrderSearch()
  //         PurchaseOrderTable(page: .init(items: [], metadata: .init(page: 0, per: 50, total: 0)))
  //       }
  //     }
  //   }
  // }

  private func mainPage<C: HTML>(
    _ html: C,
    page: IndexQuery
  ) async throws -> some SendableHTMLDocument where C: Sendable {
    let page = try await purchaseOrders.fetchPage(.init(page: page.page, per: page.limit))
    return MainPage(displayNav: true, route: .purchaseOrders) {
      div(.class("container"), .id("purchase-order-content")) {
        html
        PurchaseOrderTable(page: page)
      }
    }
  }
}

struct IndexQuery: Content {
  let page: Int
  let limit: Int

  static var `default`: Self {
    .init(page: 1, limit: 25)
  }
}

private struct CreateContext: Content {
  let id: Int?
  let workOrder: String
  let materials: String
  let customer: String
  let truckStock: Bool?
  let createdForID: Employee.ID
  let vendorBranchID: VendorBranch.ID

  func toIntermediate() -> PurchaseOrder.CreateIntermediate {
    .init(
      id: id,
      workOrder: workOrder.isEmpty ? nil : Int(workOrder),
      materials: materials,
      customer: customer,
      truckStock: truckStock,
      createdForID: createdForID,
      vendorBranchID: vendorBranchID
    )
  }
}