import React from 'react';
import type { WorkspaceSummary } from '../workspace/workspaceTypes';
import type { WorkspaceCommandRecord } from '../workspace/workspaceCommands';

interface WorkspacePanelProps {
  hasPdf: boolean;
  isBusy: boolean;

  activeWorkspaceId: string | null;
  workspaceName: string;
  workspaceDirty: boolean;
  workspaceMessage: string | null;

  workspaces: WorkspaceSummary[];
  history: WorkspaceCommandRecord[];
  redoHistory: WorkspaceCommandRecord[];

  onWorkspaceNameChange: (value: string) => void;
  onSaveWorkspace: () => void;
  onLoadWorkspace: (workspaceId: string) => void;
  onDeleteWorkspace: (workspaceId: string) => void;
  onRefreshWorkspaces: () => void;
  onResetWorkspace: () => void;
  onUndo: () => void;
  onRedo: () => void;
}

const WorkspacePanel: React.FC<WorkspacePanelProps> = ({
  hasPdf,
  isBusy,
  activeWorkspaceId,
  workspaceName,
  workspaceDirty,
  workspaceMessage,
  workspaces,
  history,
  redoHistory,
  onWorkspaceNameChange,
  onSaveWorkspace,
  onLoadWorkspace,
  onDeleteWorkspace,
  onRefreshWorkspaces,
  onResetWorkspace,
  onUndo,
  onRedo,
}) => {
  const canUndo = history.length > 0;
  const canRedo = redoHistory.length > 0;

  const latestUndo = history[history.length - 1];
  const latestRedo = redoHistory[redoHistory.length - 1];

  return (
    <div className="card">
      <h2>Workspace</h2>

      <p style={{ fontSize: '0.85rem', color: '#6b7280' }}>
        Save named workspaces in this browser. PDF binaries are stored in
        IndexedDB; nothing is uploaded.
      </p>

      <div
        style={{
          display: 'flex',
          gap: '0.5rem',
          flexWrap: 'wrap',
          alignItems: 'center',
        }}
      >
        <input
          type="text"
          value={workspaceName}
          onChange={(e) => onWorkspaceNameChange(e.target.value)}
          placeholder="Workspace name"
          disabled={!hasPdf || isBusy}
          style={{
            flex: '1 1 220px',
            minWidth: 0,
            padding: '0.45rem 0.55rem',
            borderRadius: '0.5rem',
            border: '1px solid #d1d5db',
            fontSize: '0.9rem',
          }}
        />

        <button
          type="button"
          className="secondary"
          onClick={onUndo}
          disabled={!hasPdf || isBusy || !canUndo}
          title={latestUndo ? `Undo: ${latestUndo.label}` : 'Nothing to undo'}
        >
          ↶ Undo
        </button>

        <button
          type="button"
          className="secondary"
          onClick={onRedo}
          disabled={!hasPdf || isBusy || !canRedo}
          title={latestRedo ? `Redo: ${latestRedo.label}` : 'Nothing to redo'}
        >
          ↷ Redo
        </button>

        <button
          type="button"
          className="secondary"
          onClick={onSaveWorkspace}
          disabled={!hasPdf || isBusy}
          title={!hasPdf ? 'Open a PDF first' : 'Save workspace'}
        >
          💾 {activeWorkspaceId ? 'Save' : 'Save as'}
        </button>

        <button
          type="button"
          className="secondary"
          onClick={onResetWorkspace}
          disabled={!hasPdf || isBusy}
          title={
            !hasPdf ? 'No active workspace' : 'Close the current workspace'
          }
        >
          Reset workspace
        </button>

        <button
          type="button"
          className="secondary"
          onClick={onRefreshWorkspaces}
          disabled={isBusy}
        >
          ↻ Refresh
        </button>
      </div>

      {workspaceDirty && hasPdf && (
        <div
          style={{
            marginTop: '0.5rem',
            fontSize: '0.8rem',
            color: '#92400e',
          }}
        >
          Unsaved workspace changes.
        </div>
      )}

      {workspaceMessage && (
        <div
          style={{
            marginTop: '0.5rem',
            fontSize: '0.85rem',
            color: '#166534',
          }}
        >
          {workspaceMessage}
        </div>
      )}

      {workspaces.length > 0 && (
        <div style={{ marginTop: '0.75rem' }}>
          <strong style={{ fontSize: '0.9rem' }}>Saved workspaces</strong>

          <div
            style={{
              display: 'flex',
              flexDirection: 'column',
              gap: '0.4rem',
              marginTop: '0.4rem',
            }}
          >
            {workspaces.map((workspace) => {
              const active = workspace.id === activeWorkspaceId;

              return (
                <div
                  key={workspace.id}
                  style={{
                    border: '1px solid #e5e7eb',
                    borderRadius: '0.5rem',
                    padding: '0.5rem',
                    background: active ? '#eff6ff' : '#f9fafb',
                    display: 'flex',
                    justifyContent: 'space-between',
                    gap: '0.75rem',
                    alignItems: 'center',
                    flexWrap: 'wrap',
                  }}
                >
                  <div style={{ minWidth: 0 }}>
                    <div style={{ fontSize: '0.9rem' }}>
                      <strong>{workspace.name}</strong>
                      {active && (
                        <span style={{ color: '#2563eb' }}> · active</span>
                      )}
                    </div>

                    <div style={{ fontSize: '0.75rem', color: '#6b7280' }}>
                      {workspace.pdfName} · source pages:{' '}
                      {workspace.sourcePageCount} · workspace pages:{' '}
                      {workspace.workspacePageCount} · undo:{' '}
                      {workspace.historyCount} · redo: {workspace.redoCount} ·
                      updated {new Date(workspace.updatedAt).toLocaleString()}
                    </div>
                  </div>

                  <div
                    style={{
                      display: 'flex',
                      gap: '0.35rem',
                      flexWrap: 'wrap',
                    }}
                  >
                    <button
                      type="button"
                      className="secondary"
                      disabled={isBusy}
                      onClick={() => onLoadWorkspace(workspace.id)}
                    >
                      Load
                    </button>

                    <button
                      type="button"
                      className="secondary"
                      disabled={isBusy}
                      onClick={() => onDeleteWorkspace(workspace.id)}
                      style={{
                        background: '#fee2e2',
                        color: '#991b1b',
                      }}
                    >
                      Delete
                    </button>
                  </div>
                </div>
              );
            })}
          </div>
        </div>
      )}

      {(history.length > 0 || redoHistory.length > 0) && (
        <details style={{ marginTop: '0.75rem' }} open>
          <summary style={{ cursor: 'pointer', fontSize: '0.9rem' }}>
            Command history ({history.length} undo / {redoHistory.length} redo)
          </summary>

          <div
            style={{
              marginTop: '0.5rem',
              display: 'flex',
              flexDirection: 'column',
              gap: '0.25rem',
            }}
          >
            {history.map((entry, index) => (
              <div
                key={entry.id}
                style={{
                  fontSize: '0.8rem',
                  color: '#374151',
                  borderLeft: '3px solid #2563eb',
                  paddingLeft: '0.45rem',
                  paddingTop: '0.2rem',
                  paddingBottom: '0.2rem',
                }}
              >
                <strong>
                  Undo {history.length - index}. {entry.label}
                </strong>
                <br />
                <span style={{ color: '#6b7280' }}>
                  {new Date(entry.timestamp).toLocaleString()}
                </span>
              </div>
            ))}

            <div
              style={{
                margin: '0.25rem 0',
                borderRadius: '999px',
                background: '#ecfdf5',
                color: '#166534',
                fontSize: '0.8rem',
                fontWeight: 600,
                alignSelf: 'flex-start',
                border: '2px solid #166534',
                width: '100%',
              }}
            ></div>

            {redoHistory
              .slice()
              .reverse()
              .map((entry, index) => (
                <div
                  key={entry.id}
                  style={{
                    fontSize: '0.8rem',
                    color: '#9ca3af',
                    borderLeft: '3px solid #d1d5db',
                    paddingLeft: '0.45rem',
                    paddingTop: '0.2rem',
                    paddingBottom: '0.2rem',
                    opacity: 0.75,
                  }}
                >
                  <strong>
                    Redo {index + 1}. {entry.label}
                  </strong>
                  <br />
                  <span style={{ color: '#9ca3af' }}>
                    {new Date(entry.timestamp).toLocaleString()}
                  </span>
                </div>
              ))}
          </div>
        </details>
      )}
    </div>
  );
};

export default WorkspacePanel;