import { useState, useEffect } from 'react'
import ProjectCard from './ProjectCard'
import ProjectModal from './ProjectModal'
import Button from '../UI/Button'
import AgendaPanel from '../Calendar/AgendaPanel'
import useProjectStore from '../../store/useProjectStore'
import useUIStore from '../../store/useUIStore'
import { deleteProject } from '../../api/projects'

export default function ProjectList({ onRegisterNewProject }) {
  const { projects, removeProject }         = useProjectStore()
  const { sidebarTab, setSidebarTab }       = useUIStore()
  const [showModal, setShowModal]           = useState(false)
  const [editing,   setEditing]             = useState(null)

  useEffect(() => { onRegisterNewProject?.(() => setShowModal(true)) }, [onRegisterNewProject])

  const handleEdit   = (p) => { setEditing(p); setShowModal(true) }
  const handleDelete = async (p) => {
    if (window.confirm(`Delete "${p.name}" and all its deliverables?`)) {
      await deleteProject(p.id); removeProject(p.id)
    }
  }
  const handleClose = () => { setShowModal(false); setEditing(null) }

  return (
    <div className="flex flex-col h-full">
      {/* Header */}
      <div className="flex items-center justify-between px-4 py-3 border-b border-surface-border flex-shrink-0">
        <h1 className="text-gold font-bold text-lg tracking-widest uppercase">FabDash</h1>
        <Button size="sm" onClick={() => setShowModal(true)}>+ Project</Button>
      </div>

      {/* Tab toggle */}
      <div className="flex border-b border-surface-border flex-shrink-0">
        {[['projects','Projects'],['agenda','Upcoming']].map(([key, label]) => (
          <button key={key} onClick={() => setSidebarTab(key)}
            className={`flex-1 py-2 text-xs font-semibold transition-colors ${sidebarTab === key ? 'text-gold border-b-2 border-gold' : 'text-text-muted hover:text-text-primary'}`}>
            {label}
          </button>
        ))}
      </div>

      {/* Content */}
      <div className="flex-1 overflow-y-auto">
        {sidebarTab === 'projects' ? (
          <div className="p-3 space-y-2">
            {projects.length === 0 ? (
              <div className="flex flex-col items-center justify-center py-10 px-4 text-center">
                <div className="opacity-20 mb-3">
                  <svg width="56" height="56" viewBox="0 0 56 56" fill="none">
                    <rect x="7" y="12" width="42" height="37" rx="3" stroke="#C9A84C" strokeWidth="1.5"/>
                    <line x1="7" y1="21" x2="49" y2="21" stroke="#C9A84C" strokeWidth="1.5"/>
                    <circle cx="17" cy="7" r="3.5" stroke="#C9A84C" strokeWidth="1.5"/>
                    <circle cx="39" cy="7" r="3.5" stroke="#C9A84C" strokeWidth="1.5"/>
                    <line x1="17" y1="31" x2="39" y2="31" stroke="#C9A84C" strokeWidth="1.5" strokeDasharray="4 2.5"/>
                    <line x1="17" y1="39" x2="30" y2="39" stroke="#C9A84C" strokeWidth="1.5" strokeDasharray="4 2.5"/>
                  </svg>
                </div>
                <p className="text-text-muted text-sm font-medium">No projects yet</p>
                <p className="text-text-muted/50 text-xs mt-1">
                  Press <kbd className="bg-surface-border px-1.5 py-0.5 rounded text-[10px] font-mono">N</kbd> or click + Project
                </p>
              </div>
            ) : (
              projects.map(p => (
                <ProjectCard key={p.id} project={p} onEdit={handleEdit} onDelete={handleDelete} />
              ))
            )}
          </div>
        ) : (
          <AgendaPanel />
        )}
      </div>

      {/* Keyboard shortcuts legend */}
      <div className="flex-shrink-0 border-t border-surface-border px-4 py-2 flex flex-wrap gap-x-3 gap-y-1">
        {[['N','New project'],['B','Toggle sidebar'],['←→','Navigate'],['T','Today']].map(([key, desc]) => (
          <span key={key} className="flex items-center gap-1 text-[10px] text-text-muted/50">
            <kbd className="bg-surface-border px-1 py-0.5 rounded text-[9px] font-mono">{key}</kbd>
            {desc}
          </span>
        ))}
      </div>

      <ProjectModal isOpen={showModal} onClose={handleClose} project={editing} />
    </div>
  )
}