import SwiftUI
import LabWiseKit

// MARK: - Chemical row

struct ChemicalRowView: View {
    let chemical: Chemical

    var body: some View {
        VStack(alignment: .leading, spacing: 4) {
            HStack {
                Text(chemical.displayName)
                    .font(.headline)
                Spacer()
                if let state = chemical.physicalState, !state.isEmpty {
                    PhysicalStateBadge(state: state)
                }
            }
            HStack(spacing: 6) {
                if let cas = chemical.casNumber, !cas.isEmpty {
                    Text("CAS: \(cas)")
                        .font(.caption)
                        .foregroundStyle(.secondary)
                }
                if chemical.isMissingKeyInfo {
                    MissingInfoBadge()
                }
            }
            if let pct = chemical.percentageFull {
                PercentageBar(value: pct / 100)
                    .frame(height: 4)
                    .padding(.top, 2)
            }
        }
        .padding(.vertical, 2)
    }
}

// MARK: - Physical state badge

struct PhysicalStateBadge: View {
    let state: String

    var color: Color {
        switch state.lowercased() {
        case "liquid": return Color(.brandPrimary)
        case "solid": return Color(red: 0.42, green: 0.30, blue: 0.18)
        case "gas": return Color(red: 0.22, green: 0.56, blue: 0.52)
        default: return Color(.brandMutedForeground)
        }
    }

    var body: some View {
        Text(state.capitalized)
            .font(.caption2.weight(.semibold))
            .padding(.horizontal, 8)
            .padding(.vertical, 3)
            .background(color.opacity(0.15))
            .foregroundStyle(color)
            .clipShape(Capsule())
    }
}

// MARK: - Missing info badge

/// Mirrors the web "Missing info" pill — amber, with a warning glyph.
struct MissingInfoBadge: View {
    var body: some View {
        HStack(spacing: 3) {
            Image(systemName: "exclamationmark.triangle.fill")
                .font(.caption2)
            Text("Missing info")
                .font(.caption2.weight(.semibold))
        }
        .padding(.horizontal, 6)
        .padding(.vertical, 2)
        .background(Color.orange.opacity(0.15))
        .foregroundStyle(Color.orange)
        .clipShape(Capsule())
    }
}

// MARK: - Percentage bar

struct PercentageBar: View {
    let value: Double // 0.0 – 1.0

    var body: some View {
        GeometryReader { geo in
            ZStack(alignment: .leading) {
                RoundedRectangle(cornerRadius: 2)
                    .fill(Color.secondary.opacity(0.2))
                RoundedRectangle(cornerRadius: 2)
                    .fill(barColor)
                    .frame(width: geo.size.width * max(0, min(1, value)))
            }
        }
    }

    var barColor: Color {
        if value > 0.6 { return .green }
        if value > 0.25 { return .yellow }
        return .red
    }
}