using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using EventsAppQuest.Web.Application;
using EventsAppQuest.Web.Domain;
using EventsAppQuest.Web.Core;
using EventsAppQuest.Web.Producer.Application;

namespace EventsAppQuest.Web.Presentation
{
    /// <summary>
    /// Painel de SLA do ciclo: tempo total estimado, tempo decorrido, segmentos com atraso, risco e severidade.
    /// </summary>
    public class EventCycleSLAPanel : MonoBehaviour, IWebContentRoot
    {
        private Transform _content;

        public void SetContentRoot(Transform contentRoot) => _content = contentRoot;

        private void Start()
        {
            Refresh();
            WebRuntimeContext.OnDataChanged += Refresh;
        }

        private void OnDestroy() => WebRuntimeContext.OnDataChanged -= Refresh;

        public void Refresh()
        {
            if (_content == null) return;
            ClearContent(_content);
            var data = WebRuntimeContext.DataService;
            if (data == null) return;
            var font = Resources.GetBuiltinResource<Font>("LegacyRuntime.ttf");

            var orders = HandoffStore.GetOrders();
            var opportunities = data.GetOpportunities();
            var proposals = data.GetProposals();
            var sessions = data.GetSessions();
            var followUps = data.GetFollowUpTasks();
            var slaList = EventCycleSLAController.EvaluateSLA(orders, opportunities, proposals, sessions, followUps);

            var titleRow = new GameObject("TitleRow");
            titleRow.transform.SetParent(_content, false);
            titleRow.AddComponent<RectTransform>().sizeDelta = new Vector2(0, 26);
            var titleText = titleRow.AddComponent<Text>();
            titleText.text = "SLA do ciclo (tempo estimado entre marcos e risco de atraso)";
            titleText.font = font;
            titleText.fontSize = 16;
            titleText.fontStyle = FontStyle.Bold;

            var btnRow = new GameObject("BtnRow");
            btnRow.transform.SetParent(_content, false);
            btnRow.AddComponent<RectTransform>().sizeDelta = new Vector2(0, 24);
            var hLayout = btnRow.AddComponent<HorizontalLayoutGroup>();
            hLayout.spacing = 6;
            hLayout.childForceExpandWidth = false;
            CreateSmallButton(btnRow.transform, "Recalcular", font, 80, Refresh);

            if (slaList == null || slaList.Count == 0)
            {
                var empty = new GameObject("Empty");
                empty.transform.SetParent(_content, false);
                var emptyText = empty.AddComponent<Text>();
                emptyText.font = font;
                emptyText.fontSize = 11;
                emptyText.text = "Nenhum ciclo para análise de SLA.";
                empty.GetComponent<RectTransform>().sizeDelta = new Vector2(0, 18);
                return;
            }

            foreach (var sla in slaList)
            {
                var block = new GameObject("SLA_" + sla.CycleId);
                block.transform.SetParent(_content, false);
                var layout = block.AddComponent<VerticalLayoutGroup>();
                layout.spacing = 4;
                layout.childForceExpandHeight = false;
                layout.childForceExpandWidth = true;

                var header = new GameObject("Header");
                header.transform.SetParent(block.transform, false);
                var headerText = header.AddComponent<Text>();
                headerText.font = font;
                headerText.fontSize = 14;
                headerText.fontStyle = FontStyle.Bold;
                headerText.text = $"Ciclo {sla.CycleId} | Tempo decorrido: {sla.CurrentElapsedCycleTimeDays}d (estimado total: {sla.TotalEstimatedCycleTimeDays}d) | Risco: {sla.DelayRiskLevel} | Avaliado: {(sla.LastEvaluatedAt?.ToString("yyyy-MM-dd HH:mm") ?? "—")}";
                if (sla.DelayRiskLevel == EventCycleDelaySeverity.Critical || sla.DelayRiskLevel == EventCycleDelaySeverity.High)
                    headerText.color = new Color(0.75f, 0.2f, 0.2f);
                else if (sla.DelayRiskLevel == EventCycleDelaySeverity.Medium)
                    headerText.color = new Color(0.7f, 0.4f, 0f);
                header.GetComponent<RectTransform>().sizeDelta = new Vector2(0, 20);

                if (!string.IsNullOrEmpty(sla.MainDelayReason))
                {
                    var reasonRow = new GameObject("MainDelay");
                    reasonRow.transform.SetParent(block.transform, false);
                    var reasonText = reasonRow.AddComponent<Text>();
                    reasonText.font = font;
                    reasonText.fontSize = 11;
                    reasonText.text = "Principal atraso: " + sla.MainDelayReason;
                    reasonText.color = new Color(0.6f, 0.2f, 0.2f);
                    reasonRow.GetComponent<RectTransform>().sizeDelta = new Vector2(0, 16);
                }

                if (sla.Segments != null)
                {
                    foreach (var seg in sla.Segments)
                    {
                        var segRow = new GameObject("Seg_" + seg.FromMilestoneType);
                        segRow.transform.SetParent(block.transform, false);
                        var segText = segRow.AddComponent<Text>();
                        segText.font = font;
                        segText.fontSize = 10;
                        segText.text = $"{seg.FromMilestoneType} → {seg.ToMilestoneType}: esperado {seg.ExpectedDurationDays}d, observado {seg.CurrentOrObservedDurationDays}d {(seg.IsDelayed ? "⚠ ATRASO " + seg.DelaySeverity : "")} {seg.Notes}";
                        if (seg.IsDelayed) segText.color = new Color(0.65f, 0.2f, 0.2f);
                        segRow.GetComponent<RectTransform>().sizeDelta = new Vector2(0, 14);
                    }
                }
            }
        }

        private static void CreateSmallButton(Transform parent, string text, Font font, float width, System.Action onClick)
        {
            var go = new GameObject("Btn_" + text);
            go.transform.SetParent(parent, false);
            var rt = go.AddComponent<RectTransform>();
            rt.sizeDelta = new Vector2(width, 22);
            var le = go.AddComponent<LayoutElement>();
            le.preferredWidth = width;
            le.preferredHeight = 22;
            var img = go.AddComponent<Image>();
            img.color = new Color(0.4f, 0.7f, 0.5f);
            var btn = go.AddComponent<Button>();
            btn.targetGraphic = img;
            btn.onClick.AddListener(() => onClick?.Invoke());
            var tGo = new GameObject("Text");
            tGo.transform.SetParent(go.transform, false);
            var tRt = tGo.AddComponent<RectTransform>();
            tRt.anchorMin = Vector2.zero;
            tRt.anchorMax = Vector2.one;
            tRt.offsetMin = Vector2.zero;
            tRt.offsetMax = Vector2.zero;
            var t = tGo.AddComponent<Text>();
            t.text = text;
            t.font = font;
            t.fontSize = 9;
            t.alignment = TextAnchor.MiddleCenter;
        }

        private static void ClearContent(Transform content)
        {
            for (var i = content.childCount - 1; i >= 0; i--)
                Destroy(content.GetChild(i).gameObject);
        }
    }
}
