import React from 'react';
import { useQuery } from '@tanstack/react-query';
import { Link } from 'react-router-dom';
import {
  Flag,
  Briefcase,
  Target,
  ShieldAlert,
  FileCheck,
  Edit2,
  Calendar,
  Clock,
  Coins,
  ChevronRight,
  TrendingUp,
} from 'lucide-react';
import {
  getActivities,
  getMilestones,
  getProjectIndicators,
  getProjectRisks,
  getBudgets,
} from '../../services/api';
import { Project, ApprovalStatus, Budget } from '../../types';
import {
  formatDate,
  formatZAR,
  getApprovalStatusBadge,
  getPriorityBadge,
  getRiskScoreColor,
  getUserEmail,
} from '../../lib/formatters';
import { ProjectTimelineGantt } from './ProjectTimelineGantt';

interface ProjectExpandedRowProps {
  project: Project;
  onOpenMilestonesModal: () => void;
  onOpenActivitiesModal: () => void;
  onOpenIndicatorsModal: () => void;
  onOpenRisksModal: () => void;
  onOpenEditProject: () => void;
}

export const ProjectExpandedRow: React.FC<ProjectExpandedRowProps> = ({
  project,
  onOpenMilestonesModal,
  onOpenActivitiesModal,
  onOpenIndicatorsModal,
  onOpenRisksModal,
  onOpenEditProject,
}) => {
  const projectId = project.id;

  const { data: activities = [] } = useQuery({
    queryKey: ['activities', projectId],
    queryFn: () => getActivities(projectId),
  });

  const { data: milestones = [] } = useQuery({
    queryKey: ['milestones', projectId],
    queryFn: () => getMilestones(projectId),
  });

  const { data: indicators = [] } = useQuery({
    queryKey: ['indicators', projectId],
    queryFn: () => getProjectIndicators(projectId),
  });

  const { data: risks = [] } = useQuery({
    queryKey: ['risks', projectId],
    queryFn: () => getProjectRisks(projectId),
  });

  const { data: allBudgets = [] } = useQuery({
    queryKey: ['budgets'],
    queryFn: () => getBudgets(1, 100),
  });

  const projectBudgets = allBudgets.filter((b) => String(b.projectId) === String(projectId));
  const approvedBudgets = projectBudgets.filter(
    (b) =>
      b.status === undefined ||
      b.status === null ||
      Number(b.status) === ApprovalStatus.Approved ||
      Number(b.status) === 3
  );
  const approvedBudgetTotal = approvedBudgets.reduce((sum, b) => sum + (Number(b.amount) || 0), 0);

  const verifiedMilestonesCount = milestones.filter((m) => m.status === ApprovalStatus.Approved).length;
  const milestoneProgress = milestones.length > 0 ? Math.round((verifiedMilestonesCount / milestones.length) * 100) : 0;
  const totalActivityBudget = activities.reduce((sum, a) => sum + (Number(a.amount) || 0), 0);

  return (
    <div className="p-4 sm:p-5 lg:p-6 bg-[#090d16]/95 border-t border-b border-blue-500/20 space-y-6 animate-in fade-in duration-200 w-full min-w-0">
      {/* Project Meta Bar */}
      <div className="flex flex-col lg:flex-row lg:items-center justify-between gap-4 p-4 rounded-2xl bg-[#0d121f] border border-slate-800 min-w-0">
        <div className="space-y-1 min-w-0 flex-1">
          <div className="flex items-center gap-2 flex-wrap">
            <span className="text-[10px] font-mono uppercase tracking-wider text-blue-400 bg-blue-500/10 px-2.5 py-0.5 rounded-md border border-blue-500/30 shrink-0">
              Project #{project.id} Summary
            </span>
            <span className="text-xs text-slate-400 truncate">
              Owner / Created by: <strong className="text-slate-200">{getUserEmail(project.createdBy)}</strong>
            </span>
            {approvedBudgetTotal > 0 && (
              <>
                <span className="text-slate-600">&bull;</span>
                <span className="text-xs text-emerald-400 font-mono font-semibold shrink-0">
                  Approved Budget: {formatZAR(approvedBudgetTotal)}
                </span>
              </>
            )}
          </div>
          <p className="text-xs text-slate-300 leading-relaxed">{project.description}</p>
        </div>

        <div className="flex items-center gap-2 shrink-0 self-start lg:self-center flex-wrap">
          <Link
            to={`/monitoring?tab=evidence&projectId=${project.id}`}
            className="inline-flex items-center gap-1.5 px-3 py-1.5 text-xs font-semibold text-blue-300 hover:text-white bg-blue-500/10 hover:bg-blue-500/20 border border-blue-500/30 rounded-xl transition cursor-pointer shrink-0"
          >
            <FileCheck className="w-3.5 h-3.5 text-blue-400" />
            Review Evidence Queue
          </Link>
          <button
            type="button"
            onClick={onOpenEditProject}
            className="inline-flex items-center gap-1.5 px-3 py-1.5 text-xs font-semibold text-slate-300 hover:text-white bg-slate-800 hover:bg-slate-700 border border-slate-700 rounded-xl transition cursor-pointer shrink-0"
          >
            <Edit2 className="w-3.5 h-3.5 text-slate-400" />
            Edit Project Scope
          </button>
        </div>
      </div>

      {/* Gantt-style Timeline Component */}
      <ProjectTimelineGantt
        project={project}
        milestones={milestones}
        activities={activities}
        approvedBudgetTotal={approvedBudgetTotal}
        approvedBudgetsCount={approvedBudgets.length}
        onManageMilestones={onOpenMilestonesModal}
        onManageActivities={onOpenActivitiesModal}
      />

      {/* 4 Vital Resource Summary Cards Grid */}
      <div className="grid grid-cols-1 md:grid-cols-2 2xl:grid-cols-4 gap-4 min-w-0">
        {/* Card 1: Milestones */}
        <div className="bg-[#0d121f] rounded-2xl border border-slate-800 p-4 flex flex-col justify-between space-y-3 min-w-0">
          <div className="space-y-2.5">
            <div className="flex items-center justify-between border-b border-slate-800/80 pb-2">
              <div className="flex items-center gap-2 text-xs font-bold text-white">
                <Flag className="w-4 h-4 text-blue-400" />
                <span>Milestones ({milestones.length})</span>
              </div>
              <span className="text-[10px] font-mono text-emerald-400 font-bold bg-emerald-500/10 px-2 py-0.5 rounded-full border border-emerald-500/30">
                {verifiedMilestonesCount}/{milestones.length} Verified
              </span>
            </div>

            {milestones.length === 0 ? (
              <p className="text-xs text-slate-500 py-3 text-center">No contractual milestones defined.</p>
            ) : (
              <div className="space-y-2">
                {milestones.slice(0, 3).map((m) => {
                  const sBadge = getApprovalStatusBadge(m.status);
                  return (
                    <div key={m.id} className="p-2 rounded-xl bg-slate-900/80 border border-slate-800/80 text-[11px] space-y-1">
                      <div className="flex items-start justify-between gap-1">
                        <span className="font-semibold text-slate-200 truncate block">{m.name}</span>
                        <span className={`shrink-0 text-[9px] px-1.5 py-0.2 rounded border ${sBadge.className}`}>
                          {sBadge.label}
                        </span>
                      </div>
                      <div className="text-[10px] text-slate-400 flex items-center gap-1 font-mono">
                        <Clock className="w-3 h-3 text-slate-500" />
                        Due: {formatDate(m.dueAt)}
                      </div>
                    </div>
                  );
                })}
                {milestones.length > 3 && (
                  <p className="text-[10px] text-slate-400 text-center">+{milestones.length - 3} more deliverables</p>
                )}
              </div>
            )}
          </div>

          <button
            type="button"
            onClick={onOpenMilestonesModal}
            className="w-full py-2 px-3 text-xs font-semibold text-blue-400 bg-blue-500/10 hover:bg-blue-500/20 border border-blue-500/30 rounded-xl transition flex items-center justify-center gap-1 cursor-pointer"
          >
            <span>Manage Milestones</span>
            <ChevronRight className="w-3.5 h-3.5" />
          </button>
        </div>

        {/* Card 2: Activities */}
        <div className="bg-[#0d121f] rounded-2xl border border-slate-800 p-4 flex flex-col justify-between space-y-3 min-w-0">
          <div className="space-y-2.5">
            <div className="flex items-center justify-between border-b border-slate-800/80 pb-2">
              <div className="flex items-center gap-2 text-xs font-bold text-white">
                <Briefcase className="w-4 h-4 text-cyan-400" />
                <span>Activities ({activities.length})</span>
              </div>
              <span className="text-[10px] font-mono text-cyan-400 font-bold bg-cyan-500/10 px-2 py-0.5 rounded-full border border-cyan-500/30">
                {formatZAR(totalActivityBudget)}
              </span>
            </div>

            {activities.length === 0 ? (
              <p className="text-xs text-slate-500 py-3 text-center">No work activities recorded.</p>
            ) : (
              <div className="space-y-2">
                {activities.slice(0, 3).map((act) => (
                  <div key={act.id} className="p-2 rounded-xl bg-slate-900/80 border border-slate-800/80 text-[11px] space-y-1">
                    <div className="flex items-start justify-between gap-1">
                      <span className="font-semibold text-slate-200 truncate block">{act.title}</span>
                      <span className="font-mono text-cyan-400 font-bold shrink-0">{formatZAR(act.amount)}</span>
                    </div>
                    <div className="flex items-center justify-between text-[10px] text-slate-400">
                      <span>{act.category || 'Operations'}</span>
                      <span>{formatDate(act.performedAt)}</span>
                    </div>
                  </div>
                ))}
                {activities.length > 3 && (
                  <p className="text-[10px] text-slate-400 text-center">+{activities.length - 3} more tasks</p>
                )}
              </div>
            )}
          </div>

          <button
            type="button"
            onClick={onOpenActivitiesModal}
            className="w-full py-2 px-3 text-xs font-semibold text-cyan-400 bg-cyan-500/10 hover:bg-cyan-500/20 border border-cyan-500/30 rounded-xl transition flex items-center justify-center gap-1 cursor-pointer"
          >
            <span>Manage Activities</span>
            <ChevronRight className="w-3.5 h-3.5" />
          </button>
        </div>

        {/* Card 3: Indicators */}
        <div className="bg-[#0d121f] rounded-2xl border border-slate-800 p-4 flex flex-col justify-between space-y-3 min-w-0">
          <div className="space-y-2.5">
            <div className="flex items-center justify-between border-b border-slate-800/80 pb-2">
              <div className="flex items-center gap-2 text-xs font-bold text-white">
                <Target className="w-4 h-4 text-indigo-400" />
                <span>Indicators ({indicators.length})</span>
              </div>
              <span className="text-[10px] font-mono text-indigo-400 font-bold bg-indigo-500/10 px-2 py-0.5 rounded-full border border-indigo-500/30">
                M&E Targets
              </span>
            </div>

            {indicators.length === 0 ? (
              <p className="text-xs text-slate-500 py-3 text-center">No M&E indicators defined.</p>
            ) : (
              <div className="space-y-2">
                {indicators.slice(0, 3).map((ind) => {
                  const target = Number(ind.targetAmount) || 1;
                  const actual = Number(ind.actualAmount) || 0;
                  const pct = Math.round((actual / target) * 100);
                  return (
                    <div key={ind.id} className="p-2 rounded-xl bg-slate-900/80 border border-slate-800/80 text-[11px] space-y-1">
                      <div className="flex items-start justify-between gap-1">
                        <span className="font-semibold text-slate-200 truncate block">{ind.name}</span>
                        <span className={pct >= 100 ? 'text-emerald-400 font-bold' : 'text-indigo-400 font-bold'}>
                          {pct}%
                        </span>
                      </div>
                      <div className="flex items-center justify-between text-[10px] text-slate-400">
                        <span>Actual: <strong className="text-slate-200 font-mono">{actual}</strong></span>
                        <span>Target: <strong className="text-slate-200 font-mono">{target}</strong></span>
                      </div>
                    </div>
                  );
                })}
                {indicators.length > 3 && (
                  <p className="text-[10px] text-slate-400 text-center">+{indicators.length - 3} more indicators</p>
                )}
              </div>
            )}
          </div>

          <button
            type="button"
            onClick={onOpenIndicatorsModal}
            className="w-full py-2 px-3 text-xs font-semibold text-indigo-400 bg-indigo-500/10 hover:bg-indigo-500/20 border border-indigo-500/30 rounded-xl transition flex items-center justify-center gap-1 cursor-pointer"
          >
            <span>Manage Indicators</span>
            <ChevronRight className="w-3.5 h-3.5" />
          </button>
        </div>

        {/* Card 4: Risks */}
        <div className="bg-[#0d121f] rounded-2xl border border-slate-800 p-4 flex flex-col justify-between space-y-3 min-w-0">
          <div className="space-y-2.5">
            <div className="flex items-center justify-between border-b border-slate-800/80 pb-2">
              <div className="flex items-center gap-2 text-xs font-bold text-white">
                <ShieldAlert className="w-4 h-4 text-rose-400" />
                <span>Risks ({risks.length})</span>
              </div>
              <span className="text-[10px] font-mono text-rose-400 font-bold bg-rose-500/10 px-2 py-0.5 rounded-full border border-rose-500/30">
                ISO 31000
              </span>
            </div>

            {risks.length === 0 ? (
              <p className="text-xs text-slate-500 py-3 text-center">No project hazards logged.</p>
            ) : (
              <div className="space-y-2">
                {risks.slice(0, 3).map((rk) => {
                  const score = (rk.likelihood || 1) * (rk.impact || 1);
                  const riskInfo = getRiskScoreColor(rk.likelihood || 1, rk.impact || 1);
                  return (
                    <div key={rk.id} className="p-2 rounded-xl bg-slate-900/80 border border-slate-800/80 text-[11px] space-y-1">
                      <div className="flex items-start justify-between gap-1">
                        <span className="font-semibold text-slate-200 truncate block">{rk.name}</span>
                        <span className={`text-[9px] px-1.5 py-0.2 rounded font-mono ${riskInfo.badge}`}>
                          {score}/25 {riskInfo.level}
                        </span>
                      </div>
                      <p className="text-[10px] text-slate-400 line-clamp-1">{rk.description}</p>
                    </div>
                  );
                })}
                {risks.length > 3 && (
                  <p className="text-[10px] text-slate-400 text-center">+{risks.length - 3} more risks</p>
                )}
              </div>
            )}
          </div>

          <button
            type="button"
            onClick={onOpenRisksModal}
            className="w-full py-2 px-3 text-xs font-semibold text-rose-400 bg-rose-500/10 hover:bg-rose-500/20 border border-rose-500/30 rounded-xl transition flex items-center justify-center gap-1 cursor-pointer"
          >
            <span>Manage Risks</span>
            <ChevronRight className="w-3.5 h-3.5" />
          </button>
        </div>
      </div>
    </div>
  );
};