import SwiftUI

struct CreateWalletView: View {
  @EnvironmentObject private var model: AppModel
  @Binding var route: Route
  @Binding var seedBox: SeedBox?

  @State private var name = ""
  @State private var localError: String?

  var body: some View {
    VStack(alignment: .leading, spacing: 18) {
      ScreenHeader(title: "Create wallet",
                   subtitle: "A new \(model.chain.title) wallet on this device",
                   onBack: { route = .home })

      VStack(alignment: .leading, spacing: 6) {
        FieldLabel(text: "Wallet name")
        KoinsTextField(placeholder: "My \(model.symbol) wallet", text: $name)
      }

      if model.chain == .xmr {
        Card {
          Text("The wallet file is created locally and encrypted on this device. Syncing starts right away and can take a while for a new Monero wallet.")
            .font(.system(size: 12))
            .foregroundStyle(Theme.muted)
        }
      }

      if let message = localError ?? model.errorMessage {
        MessageBanner(message: message, isError: true)
      }

      PrimaryButton(title: model.isBusy ? "Generating…" : "Generate wallet",
                    disabled: model.isBusy) {
        Task {
          localError = nil
          model.clearMessages()
          do {
            let seed = try await model.createWallet(name: name)
            seedBox = SeedBox(seed: seed, symbol: model.symbol)
            route = .dashboard
          } catch {
            localError = error.localizedDescription
          }
        }
      }

      Spacer(minLength: 0)
    }
  }
}

struct ImportWalletView: View {
  @EnvironmentObject private var model: AppModel
  @Binding var route: Route

  @State private var name = ""
  @State private var secret = ""
  @State private var restoreHeight = ""
  @State private var localError: String?
  @State private var tipError: String?
  @State private var isLoadingTip = false

  var body: some View {
    VStack(alignment: .leading, spacing: 18) {
      ScreenHeader(title: "Import wallet",
                   subtitle: "Restore a \(model.chain.title) wallet from its seed",
                   onBack: { route = .home })

      VStack(alignment: .leading, spacing: 6) {
        FieldLabel(text: "Wallet name")
        KoinsTextField(placeholder: "My \(model.symbol) wallet", text: $name)
      }

      VStack(alignment: .leading, spacing: 6) {
        FieldLabel(text: model.chain == .xrp ? "Recovery phrase" : "Mnemonic seed")
        KoinsTextField(placeholder: model.chain == .xrp ? "12 words, or a family seed (sEd…)" : "25 word seed phrase",
                       text: $secret,
                       multiline: model.chain == .xmr)
      }

      if model.chain == .xmr {
        VStack(alignment: .leading, spacing: 6) {
          FieldLabel(text: "Restore height (optional)")
          KoinsTextField(placeholder: "e.g. 3200000", text: $restoreHeight, keyboard: .numberPad)
        }
        Card {
          VStack(alignment: .leading, spacing: 10) {
            Text("Without a height the wallet scans the whole chain — millions of blocks, which takes hours on a phone. Set the block your wallet was first used, or start from the current tip if you only care about new funds.")
              .font(.system(size: 12))
              .foregroundStyle(Theme.muted)
            Button {
              Task {
                tipError = nil
                isLoadingTip = true
                defer { isLoadingTip = false }
                do {
                  let tip = try await MoneroService.shared.daemonHeight()
                  restoreHeight = String(tip)
                } catch {
                  tipError = error.localizedDescription
                }
              }
            } label: {
              Text(isLoadingTip ? "Fetching chain tip…" : "Use the current chain tip")
                .font(.system(size: 13, weight: .medium))
                .foregroundStyle(Theme.accent)
            }
            .disabled(isLoadingTip)
            if let tipError {
              Text(tipError)
                .font(.system(size: 11))
                .foregroundStyle(Theme.danger)
            }
          }
        }
      }

      if let message = localError ?? model.errorMessage {
        MessageBanner(message: message, isError: true)
      }

      PrimaryButton(title: model.isBusy ? "Importing…" : "Import wallet",
                    disabled: model.isBusy) {
        Task {
          localError = nil
          model.clearMessages()
          do {
            let height = UInt64(restoreHeight.trimmingCharacters(in: .whitespaces))
            try await model.importWallet(name: name, secret: secret, restoreHeight: height)
            route = .dashboard
          } catch {
            localError = error.localizedDescription
          }
        }
      }

      Spacer(minLength: 0)
    }
  }
}