import SwiftUI

struct SettingsView: View {
    @AppStorage(SyncSettings.enabledKey) private var enabled = false
    @AppStorage(SyncSettings.remoteKey) private var remote = ""
    @AppStorage(SyncSettings.dirKey) private var dir = ""
    // Stored as text so edits commit per keystroke (a format-based numeric
    // field only commits on Return/focus loss, which a button click isn't).
    @AppStorage(SyncSettings.portKey) private var portText = "22"

    @AppStorage(PGSettings.autoIngestKey) private var pgAutoIngest = false
    @AppStorage(PGSettings.uriKey) private var pgURI = PGSettings.defaultURI

    @AppStorage(AppSettings.boardPageSizeKey) private var boardPageSize = "letter"
    @AppStorage(AppSettings.boardOrientationKey) private var boardOrientation = "portrait"
    @AppStorage(AppSettings.boardSnapKey) private var boardSnap = true

    @State private var testing = false
    @State private var testMessage: String?
    @State private var testSucceeded = false
    // Bumped on every config edit so an in-flight test of the old config
    // can't land its result on the new one.
    @State private var testGeneration = 0

    @State private var pgTesting = false
    @State private var pgMessage: String?
    @State private var pgSucceeded = false

    private var trimmedRemote: String { remote.trimmingCharacters(in: .whitespaces) }

    private var portValue: Int? {
        let t = portText.trimmingCharacters(in: .whitespaces)
        if t.isEmpty { return 22 }
        guard let p = Int(t), (1...65535).contains(p) else { return nil }
        return p
    }

    var body: some View {
        Form {
            Section("Board") {
                Picker("New page size:", selection: $boardPageSize) {
                    ForEach(PageSize.allCases, id: \.rawValue) { ps in
                        Text(ps.label).tag(ps.rawValue)
                    }
                }
                Picker("New page orientation:", selection: $boardOrientation) {
                    Text("Portrait").tag("portrait")
                    Text("Landscape").tag("landscape")
                }
                Toggle("Snap to grid while dragging", isOn: $boardSnap)
                Text("Defaults for new documents and new text pages. Change the current page's size anytime with the size popup and P/L control in Board mode.")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
            Section("Tailnet sync") {
                Toggle("Copy file to remote Mac on every save", isOn: $enabled)
                if enabled && trimmedRemote.isEmpty {
                    Label("Sync is on, but no remote is set below — saves won't be copied",
                          systemImage: "exclamationmark.triangle.fill")
                        .foregroundStyle(.orange)
                }
            }
            Section("Remote (over Tailscale)") {
                TextField("Remote:", text: $remote, prompt: Text("user@tailscale-hostname"))
                    .autocorrectionDisabled()
                TextField("Folder:", text: $dir, prompt: Text("/Users/you/Documents/inbox or ~/inbox"))
                    .autocorrectionDisabled()
                TextField("SSH port:", text: $portText, prompt: Text("22"))
                if portValue == nil {
                    Label("Port must be a number from 1–65535",
                          systemImage: "exclamationmark.triangle.fill")
                        .foregroundStyle(.red)
                }
            }
            Section {
                HStack(spacing: 10) {
                    Button(testing ? "Testing…" : "Test Connection") { runTest() }
                        .disabled(testing || trimmedRemote.isEmpty || portValue == nil)
                    if testing {
                        ProgressView().controlSize(.small)
                    } else if let message = testMessage {
                        Label(message, systemImage: testSucceeded ? "checkmark.circle.fill" : "xmark.circle.fill")
                            .foregroundStyle(testSucceeded ? Color.green : Color.red)
                            .lineLimit(3)
                            .textSelection(.enabled)
                    }
                }
                Text("Uses your SSH keys (no password prompts). `ssh \(trimmedRemote.isEmpty ? "user@host" : trimmedRemote)` must work without typing a password — see the README for one-time key setup. The target Mac needs Remote Login enabled in System Settings → Sharing.")
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
            Section("Postgres (scraper ingest)") {
                Toggle("Auto-ingest HTML pages on save", isOn: $pgAutoIngest)
                TextField("Connection URI:", text: $pgURI, prompt: Text(PGSettings.defaultURI))
                    .autocorrectionDisabled()
                HStack(spacing: 10) {
                    Button(pgTesting ? "Testing…" : "Test & Create Tables") { runPGTest() }
                        .disabled(pgTesting)
                    if pgTesting {
                        ProgressView().controlSize(.small)
                    } else if let message = pgMessage {
                        Label(message, systemImage: pgSucceeded ? "checkmark.circle.fill" : "xmark.circle.fill")
                            .foregroundStyle(pgSucceeded ? Color.green : Color.red)
                            .lineLimit(3)
                            .textSelection(.enabled)
                    }
                }
                Text(pgFooter)
                    .font(.caption)
                    .foregroundStyle(.secondary)
            }
        }
        .formStyle(.grouped)
        .frame(width: 480)
        .fixedSize(horizontal: false, vertical: true)
        .onChange(of: remote) { invalidateTest() }
        .onChange(of: dir) { invalidateTest() }
        .onChange(of: portText) { invalidateTest() }
    }

    private var pgFooter: String {
        let psql = PostgresStore.psqlPath.map { "psql: \($0)" }
            ?? "psql not found — brew install postgresql@17"
        return "On save, documents that look like HTML (URL on the first line, then pasted <body>) are parsed and stored: page + selector summary, and Discogs marketplace pages also upsert discogs_sellers / marketplace_snapshots. \(psql)"
    }

    private func runPGTest() {
        pgTesting = true
        pgMessage = nil
        let uri = pgURI.trimmingCharacters(in: .whitespaces)
        PostgresStore.test(uri: uri.isEmpty ? PGSettings.defaultURI : uri) { result in
            pgTesting = false
            switch result {
            case .success(let message):
                pgSucceeded = true
                pgMessage = message
            case .failure(let error):
                pgSucceeded = false
                pgMessage = error.message
            }
        }
    }

    private func invalidateTest() {
        testGeneration += 1
        testMessage = nil
        testing = false
    }

    private func runTest() {
        testGeneration += 1
        let generation = testGeneration
        testing = true
        testMessage = nil
        SyncEngine.testConnection(remote: trimmedRemote,
                                  port: portValue ?? 22,
                                  dir: dir) { result in
            guard generation == testGeneration else { return }
            testing = false
            switch result {
            case .success(let message):
                testSucceeded = true
                testMessage = message
            case .failure(let error):
                testSucceeded = false
                testMessage = error.message
            }
        }
    }
}