import React, { useState, useEffect } from 'react';
import { Card } from '../ui/card';
import { Button } from '../ui/button';
import { Badge } from '../ui/badge';
import { SearchInput } from '../ui/input';
import {
  MoreVertical,
  Plus,
  LayoutGrid,
  List,
  Loader2,
  AlertCircle,
} from 'lucide-react';
import { useToast } from '../../context/ToastContext';
import { CreateProjectModal } from './projects/CreateProjectModal';
import { ProjectDetailView } from './projects/ProjectDetailView';
import { projectService, Project } from '../../services/projectService';
import { logger } from '@/utils/logger';

export const ProjectsManager: React.FC = () => {
  const { addToast } = useToast();
  const [viewState, setViewState] = useState<'list' | 'detail'>('list');
  const [selectedProjectId, setSelectedProjectId] = useState<string | null>(
    null,
  );
  const [projects, setProjects] = useState<Project[]>([]);
  const [loading, setLoading] = useState(true);
  const [filter, setFilter] = useState('All');
  const [search, setSearch] = useState('');
  const [showCreateModal, setShowCreateModal] = useState(false);

  useEffect(() => {
    loadProjects();
  }, []);

  const loadProjects = async () => {
    try {
      setLoading(true);
      const response = await projectService.list();
      setProjects(response.projects || []);
    } catch (error) {
      logger.error('Failed to load projects', {
        error: error instanceof Error ? error.message : String(error),
        stack: error instanceof Error ? error.stack : undefined,
      });
      // Fallback for demo if API fails
      setProjects([
        {
          id: 'p1',
          name: 'Neon Genesis',
          daw: 'Ableton',
          bpm: 128,
          key: 'C Min',
          status: 'In Progress',
          collaborators: 2,
          modified: '2h ago',
          progress: 65,
        },
        {
          id: 'p2',
          name: 'Night City Drift',
          daw: 'FL Studio',
          bpm: 140,
          key: 'F# Min',
          status: 'Mixing',
          collaborators: 0,
          modified: '1d ago',
          progress: 80,
        },
        {
          id: 'p3',
          name: 'Mainframe Breach',
          daw: 'Logic Pro',
          bpm: 174,
          key: 'D Maj',
          status: 'Mastering',
          collaborators: 1,
          modified: '3d ago',
          progress: 95,
        },
      ]);
    } finally {
      setLoading(false);
    }
  };

  // --- Actions ---

  const handleCreate = async (newProjectData: any) => {
    try {
      const newProject = await projectService.create(newProjectData);
      setProjects([newProject, ...projects]);
      addToast(`Project "${newProject.name}" created`, 'success');
    } catch (e) {
      // Fallback
      const mockProject = { id: `p-${Date.now()}`, ...newProjectData };
      setProjects([mockProject, ...projects]);
      addToast('Project created (Offline Mode)', 'success');
    }
  };

  const handleUpdate = async (updatedProject: any) => {
    try {
      await projectService.update(updatedProject.id, updatedProject);
      setProjects((prev) =>
        prev.map((p) => (p.id === updatedProject.id ? updatedProject : p)),
      );
    } catch (e) {
      setProjects((prev) =>
        prev.map((p) => (p.id === updatedProject.id ? updatedProject : p)),
      );
    }
  };

  const handleDelete = async (id: string) => {
    try {
      await projectService.delete(id);
      setProjects((prev) => prev.filter((p) => p.id !== id));
      setViewState('list');
      setSelectedProjectId(null);
      addToast('Project deleted', 'info');
    } catch (e) {
      addToast('Failed to delete project', 'error');
    }
  };

  const openProject = (id: string) => {
    setSelectedProjectId(id);
    setViewState('detail');
  };

  // --- Filtering ---
  const filteredProjects = projects.filter((p) => {
    const matchesSearch = p.name.toLowerCase().includes(search.toLowerCase());
    const matchesFilter = filter === 'All' || p.daw === filter;
    return matchesSearch && matchesFilter;
  });

  const selectedProject = projects.find((p) => p.id === selectedProjectId);

  // --- Render Detail View ---
  if (viewState === 'detail' && selectedProject) {
    return (
      <ProjectDetailView
        project={selectedProject}
        onBack={() => setViewState('list')}
        onUpdate={handleUpdate}
        onDelete={handleDelete}
      />
    );
  }

  // --- Render List View ---
  return (
    <div className="space-y-6 animate-fadeIn pb-20">
      <div className="flex flex-col md:flex-row justify-between items-end gap-4">
        <div>
          <h2 className="text-2xl font-display font-bold text-white mb-2">
            ACTIVE PROJECTS
          </h2>
          <p className="text-kodo-content-dim font-mono text-sm">
            Track progress across all your workstations.
          </p>
        </div>
        <Button
          variant="primary"
          icon={<Plus className="w-4 h-4" />}
          onClick={() => setShowCreateModal(true)}
        >
          NEW PROJECT
        </Button>
      </div>

      {/* Filter Bar */}
      <div className="flex flex-col md:flex-row gap-4 items-center bg-kodo-ink/50 p-4 rounded-xl border border-kodo-steel/50">
        <div className="w-full md:w-72">
          <SearchInput
            placeholder="Search projects..."
            value={search}
            onChange={(e) => setSearch(e.target.value)}
          />
        </div>
        <div className="flex gap-2 overflow-x-auto w-full md:w-auto pb-2 md:pb-0">
          {['All', 'Ableton', 'FL Studio', 'Logic Pro'].map((daw) => (
            <button
              key={daw}
              className={`px-3 py-1.5 rounded-lg text-xs font-bold uppercase tracking-wider transition-colors border ${filter === daw ? 'bg-kodo-cyan text-black border-kodo-cyan' : 'bg-kodo-slate text-kodo-content-dim border-transparent hover:border-kodo-steel'}`}
              onClick={() => setFilter(daw)}
            >
              {daw}
            </button>
          ))}
        </div>
        <div className="ml-auto flex gap-2">
          <div className="bg-kodo-void p-1 rounded-lg border border-kodo-steel flex">
            <Button variant="secondary" size="icon" className="p-1.5">
              <LayoutGrid className="w-4 h-4" />
            </Button>
            <Button variant="ghost" size="icon" className="p-1.5">
              <List className="w-4 h-4" />
            </Button>
          </div>
        </div>
      </div>

      {/* Projects Grid */}
      {loading ? (
        <div className="flex justify-center py-20">
          <Loader2 className="w-8 h-8 text-kodo-cyan animate-spin" />
        </div>
      ) : (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
          {filteredProjects.map((project) => (
            <Card
              key={project.id}
              variant="gaming"
              className="group cursor-pointer hover:border-kodo-cyan/50 transition-all hover:-translate-y-1"
              onClick={() => openProject(project.id)}
            >
              <div className="flex justify-between items-start mb-4">
                <Badge
                  label={project.daw}
                  variant={
                    project.daw === 'Ableton'
                      ? 'cyan'
                      : project.daw === 'FL Studio'
                        ? 'gold'
                        : 'magenta'
                  }
                />
                <div
                  onClick={(e) => {
                    e.stopPropagation();
                    addToast('Options menu');
                  }}
                >
                  <MoreVertical className="w-4 h-4 text-kodo-content-dim hover:text-white" />
                </div>
              </div>

              <h3 className="text-xl font-bold text-white mb-1 group-hover:text-kodo-cyan transition-colors truncate">
                {project.name}
              </h3>
              <p className="text-xs text-kodo-content-dim mb-4 font-mono">
                Last edited {project.modified}
              </p>

              <div className="grid grid-cols-2 gap-2 mb-4">
                <div className="bg-white/5 p-2 rounded text-center border border-white/5">
                  <div className="text-[10px] text-kodo-content-dim uppercase font-bold">
                    BPM
                  </div>
                  <div className="font-bold text-white">{project.bpm}</div>
                </div>
                <div className="bg-white/5 p-2 rounded text-center border border-white/5">
                  <div className="text-[10px] text-kodo-content-dim uppercase font-bold">
                    Key
                  </div>
                  <div className="font-bold text-white">{project.key}</div>
                </div>
              </div>

              <div className="mb-4">
                <div className="flex justify-between text-xs mb-1">
                  <span className="text-kodo-content-dim font-bold">
                    {project.status}
                  </span>
                  <span className="text-kodo-cyan">{project.progress}%</span>
                </div>
                <div className="h-1.5 bg-kodo-steel rounded-full overflow-hidden">
                  <div
                    className="h-full bg-kodo-cyan"
                    style={{ width: `${project.progress}%` }}
                  ></div>
                </div>
              </div>

              <div className="flex justify-between items-center pt-4 border-t border-kodo-steel">
                <div className="flex -space-x-2">
                  <div className="w-6 h-6 rounded-full bg-kodo-steel border border-black"></div>
                  {project.collaborators > 0 && (
                    <div className="w-6 h-6 rounded-full bg-kodo-ink border border-black flex items-center justify-center text-[10px] text-white">
                      +{project.collaborators}
                    </div>
                  )}
                </div>
                <Button variant="ghost" size="sm" className="text-xs h-8">
                  OPEN
                </Button>
              </div>
            </Card>
          ))}

          {/* Add New Placeholder */}
          <div
            className="border-2 border-dashed border-kodo-steel rounded-xl flex flex-col items-center justify-center p-8 hover:bg-kodo-slate/20 transition-colors cursor-pointer text-kodo-content-dim hover:text-kodo-cyan hover:border-kodo-cyan min-h-[250px]"
            onClick={() => setShowCreateModal(true)}
          >
            <div className="w-16 h-16 bg-kodo-ink rounded-full flex items-center justify-center mb-4 group-hover:scale-110 transition-transform">
              <Plus className="w-8 h-8 opacity-50" />
            </div>
            <span className="font-mono font-bold">START NEW PROJECT</span>
          </div>
        </div>
      )}

      {filteredProjects.length === 0 && !loading && (
        <div className="text-center py-20 text-kodo-content-dim">
          <AlertCircle className="w-12 h-12 mx-auto mb-2 opacity-30" />
          <p>No projects found matching your filters.</p>
        </div>
      )}

      {showCreateModal && (
        <CreateProjectModal
          onClose={() => setShowCreateModal(false)}
          onCreate={handleCreate}
        />
      )}
    </div>
  );
};
