import SwiftData
import SwiftUI
import UIKit

struct ResultEditorView: View {
    enum Mode {
        case recognized
        case manual

        var title: String {
            switch self {
            case .recognized:
                return "Review Result"
            case .manual:
                return "Manual Entry"
            }
        }
    }

    @Environment(\.modelContext) private var modelContext
    @ObservedObject var flowModel: ScanFlowModel
    let mode: Mode

    var body: some View {
        Group {
            if let session = flowModel.currentSession {
                Form {
                    if let image = session.thumbnailJPEGData.flatMap(UIImage.init(data:)) {
                        Section {
                            Image(uiImage: image)
                                .resizable()
                                .scaledToFit()
                                .frame(maxWidth: .infinity)
                                .clipShape(RoundedRectangle(cornerRadius: 18))
                        }
                    }

                    Section("Recognition") {
                        LabeledContent("Source", value: draftBinding.wrappedValue.source.title)
                        LabeledContent("Confidence", value: draftBinding.wrappedValue.confidence.title)
                        Text(draftBinding.wrappedValue.confidence.helperText)
                            .font(.footnote)
                            .foregroundStyle(.secondary)
                        Text(draftBinding.wrappedValue.source.detail)
                            .font(.footnote)
                            .foregroundStyle(.secondary)
                    }

                    Section("Card details") {
                        TextField("Card name", text: draftBinding.cardName)
                            .textInputAutocapitalization(.words)
                        TextField("Card number", text: draftBinding.cardNumber)
                            .textInputAutocapitalization(.never)
                        TextField("Set", text: draftBinding.setIdentifier)
                            .textInputAutocapitalization(.words)
                        Picker("Rarity", selection: draftBinding.rarity) {
                            ForEach(CardRarity.allCases) { rarity in
                                Text(rarity.rawValue).tag(rarity.rawValue)
                            }
                        }
                    }

                    if !draftBinding.wrappedValue.notes.isEmpty {
                        Section("Hints") {
                            ForEach(Array(draftBinding.wrappedValue.notes.enumerated()), id: \.offset) { _, note in
                                Text(note)
                                    .font(.subheadline)
                            }
                        }
                    }

                    if !draftBinding.wrappedValue.rawText.isEmpty {
                        Section("OCR fragments") {
                            Text(draftBinding.wrappedValue.rawText)
                                .font(.footnote.monospaced())
                                .foregroundStyle(.secondary)
                                .textSelection(.enabled)
                        }
                    }

                    Section {
                        Button("Confirm and Log") {
                            confirmDraft()
                        }
                        .buttonStyle(.borderedProminent)

                        Button(mode == .recognized ? "Manual Entry" : "Re-scan") {
                            if mode == .recognized {
                                flowModel.openManualEntryFromResult()
                            } else {
                                flowModel.returnToScan()
                            }
                        }

                        if mode == .recognized {
                            Button("Re-scan") {
                                flowModel.returnToScan()
                            }
                            .foregroundStyle(.red)
                        }
                    }
                }
            } else {
                ContentUnavailableView("No scan loaded", systemImage: "rectangle.and.text.magnifyingglass", description: Text("Capture or import a card image first."))
            }
        }
        .navigationTitle(mode.title)
        .navigationBarTitleDisplayMode(.inline)
    }

    private var draftBinding: Binding<CardRecognitionDraft> {
        Binding(
            get: {
                flowModel.currentSession?.draft ?? .manualPrefill()
            },
            set: { flowModel.updateDraft($0) }
        )
    }

    private func confirmDraft() {
        let draft = draftBinding.wrappedValue
        modelContext.insert(ConfirmedScanRecord(draft: draft))
        flowModel.returnToScan(message: "Saved to temporary local log.")
    }
}

private extension Binding where Value == CardRecognitionDraft {
    var cardName: Binding<String> {
        Binding<String>(
            get: { wrappedValue.cardName },
            set: {
                var draft = wrappedValue
                draft.cardName = $0
                wrappedValue = draft
            }
        )
    }

    var cardNumber: Binding<String> {
        Binding<String>(
            get: { wrappedValue.cardNumber },
            set: {
                var draft = wrappedValue
                draft.cardNumber = $0
                wrappedValue = draft
            }
        )
    }

    var setIdentifier: Binding<String> {
        Binding<String>(
            get: { wrappedValue.setIdentifier },
            set: {
                var draft = wrappedValue
                draft.setIdentifier = $0
                wrappedValue = draft
            }
        )
    }

    var rarity: Binding<String> {
        Binding<String>(
            get: { wrappedValue.rarity },
            set: {
                var draft = wrappedValue
                draft.rarity = $0
                wrappedValue = draft
            }
        )
    }
}