import { ChatSessionMode, type AiProvider, type ChatSession, type AiModel } from '../lib/api';
import { WorkspaceMode } from '../lib/types';
import WorkspaceModeIndicator from './WorkspaceModeIndicator';

interface SessionPanelProps {
  session: ChatSession | null;
  workspaceMode: WorkspaceMode;
  sessionLocked: boolean;
  providers: AiProvider[];
  selectedProviderId: string;
  selectedModelId: string;
  sessionReasoningEffort: string;
  sessionNumCtx: number;
  isEditingProvider: boolean;
  editProviderId: string;
  editModelId: string;
  isUpdatingProvider: boolean;
  isEditingName: boolean;
  editName: string;
  isUpdatingName: boolean;
  isUpdatingMode: boolean;
  isUpdatingReasoning: boolean;
  isUpdatingNumCtx: boolean;
  onWorkspaceModeChange: (mode: WorkspaceMode) => void;
  onModeChange: (e: React.ChangeEvent<HTMLSelectElement>) => void;
  onReasoningChange: (e: React.ChangeEvent<HTMLSelectElement>) => void;
  onNumCtxChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
  onNumCtxCommit: (e: React.MouseEvent<HTMLInputElement> | React.TouchEvent<HTMLInputElement>) => void;
  onStartEditProvider: () => void;
  onSaveProvider: () => void;
  onCancelEditProvider: () => void;
  onEditProviderIdChange: (id: string) => void;
  onEditModelIdChange: (id: string) => void;
  onStartEditName: () => void;
  onSaveName: () => void;
  onCancelEditName: () => void;
  onEditNameChange: (name: string) => void;
  getProviderName: (id: string) => string;
  getModelName: (providerId: string, modelId: string) => string;
  getSortedModels: (providerId: string) => AiProvider['models'];
  truncateModelName: (name: string, maxLength?: number) => string;
  getSelectedModelCapabilities: () => { hasThinking: boolean } | null;
  getSelectedModel: () => AiModel | null;
  contextWindowUsage: number;
}

export default function SessionPanel({
  session,
  workspaceMode,
  sessionLocked,
  providers,
  selectedProviderId,
  selectedModelId,
  sessionReasoningEffort,
  sessionNumCtx,
  isEditingProvider,
  editProviderId,
  editModelId,
  isUpdatingProvider,
  isEditingName,
  editName,
  isUpdatingName,
  isUpdatingMode,
  isUpdatingReasoning,
  isUpdatingNumCtx,
  onWorkspaceModeChange,
  onModeChange,
  onReasoningChange,
  onNumCtxChange,
  onNumCtxCommit,
  onStartEditProvider,
  onSaveProvider,
  onCancelEditProvider,
  onEditProviderIdChange,
  onEditModelIdChange,
  onStartEditName,
  onSaveName,
  onCancelEditName,
  onEditNameChange,
  getProviderName,
  getModelName,
  getSortedModels,
  truncateModelName,
  getSelectedModelCapabilities,
  getSelectedModel,
  contextWindowUsage,
}: SessionPanelProps) {
  const usagePercent = sessionNumCtx > 0 ? (contextWindowUsage / sessionNumCtx) * 100 : 0;
  return (
    <div className="border-b border-border-subtle shrink-0">
      <div className="flex items-center justify-between px-4 py-2 bg-bg-tertiary">
        <h3 className="text-sm font-semibold text-text-secondary uppercase tracking-wider">
          Session
        </h3>
        <WorkspaceModeIndicator
          mode={workspaceMode}
          onChange={onWorkspaceModeChange}
          disabled={!sessionLocked || isEditingProvider}
        />
      </div>
      <div className="p-4 space-y-3">
        <div>
          <div className="text-xs text-text-muted">Name</div>
          {isEditingName ? (
            <div className="flex gap-2 mt-1">
              <input
                type="text"
                value={editName}
                onChange={(e) => onEditNameChange(e.target.value)}
                onKeyDown={(e) => {
                  if (e.key === 'Enter') { e.preventDefault(); onSaveName(); }
                  if (e.key === 'Escape') { e.preventDefault(); onCancelEditName(); }
                }}
                className="flex-1 px-2 py-1.5 bg-bg-tertiary border border-border-default rounded text-text-primary text-sm focus:border-brand focus:outline-none"
                autoFocus
              />
              <button
                title="Save"
                onClick={onSaveName}
                disabled={!editName.trim() || isUpdatingName}
                className="text-green-500 hover:text-green-400 disabled:opacity-30 disabled:cursor-not-allowed transition-colors self-center"
              >
                <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                </svg>
              </button>
              <button
                title="Cancel"
                onClick={onCancelEditName}
                disabled={isUpdatingName}
                className="text-red-500 hover:text-red-400 disabled:opacity-30 transition-colors self-center"
              >
                <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>
          ) : (
            <div className="flex gap-2 items-center mt-1">
              <div className="text-text-primary flex-1">{session?.name}</div>
              <button
                title="Edit name"
                onClick={onStartEditName}
                className="text-text-muted hover:text-text-primary transition-colors"
              >
                <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.066 2.573c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.573 1.066c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.066-2.573c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
                </svg>
              </button>
            </div>
          )}
        </div>
        {isEditingProvider ? (
          <div className="flex gap-2">
            <div className="flex-1">
              <div className="text-xs text-text-muted">Provider</div>
              <select
                value={editProviderId || ''}
                onChange={(e) => { onEditProviderIdChange(e.target.value); onEditModelIdChange(''); }}
                className="w-full mt-1 px-2 py-1.5 bg-bg-tertiary border border-border-default rounded text-text-primary text-sm focus:border-brand focus:outline-none"
              >
                <option value="">-- Select Provider --</option>
                {providers.map((provider) => (
                  <option key={provider._id} value={provider._id}>
                    {provider.name}
                  </option>
                ))}
              </select>
            </div>
            <div className="flex-1">
              <div className="text-xs text-text-muted">Model</div>
              <select
                value={editModelId || ''}
                onChange={(e) => onEditModelIdChange(e.target.value)}
                disabled={!editProviderId}
                className="w-full mt-1 px-2 py-1.5 bg-bg-tertiary border border-border-default rounded text-text-primary text-sm focus:border-brand focus:outline-none disabled:opacity-50 disabled:cursor-not-allowed truncate"
              >
                {!editProviderId ? (
                  <option value="">Select provider first</option>
                ) : (
                  <>
                    <option value="">-- Select Model --</option>
                    {getSortedModels(editProviderId).map((model) => (
                      <option key={model.id} value={model.id}>
                        {truncateModelName(model.name)}
                      </option>
                    ))}
                  </>
                )}
              </select>
            </div>
            <div className="flex items-end gap-1 pb-1">
              <button
                title="Save"
                onClick={onSaveProvider}
                disabled={!editProviderId || !editModelId || isUpdatingProvider}
                className="text-green-500 hover:text-green-400 disabled:opacity-30 disabled:cursor-not-allowed transition-colors"
              >
                <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
                </svg>
              </button>
              <button
                title="Cancel"
                onClick={onCancelEditProvider}
                disabled={isUpdatingProvider}
                className="text-red-500 hover:text-red-400 disabled:opacity-30 transition-colors"
              >
                <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
                </svg>
              </button>
            </div>
          </div>
        ) : (
          <div className="flex gap-2">
            <div className="flex-1">
              <div className="text-xs text-text-muted">Provider</div>
              <div className="text-text-primary text-sm mt-1">{getProviderName(selectedProviderId)}</div>
            </div>
            <div className="flex-1">
              <div className="text-xs text-text-muted">Model</div>
              <div
                className="text-text-primary text-sm mt-1 truncate"
                title={getModelName(selectedProviderId, selectedModelId)}
              >
                {getModelName(selectedProviderId, selectedModelId)}
              </div>
            </div>
            <button
              title="Change provider/model..."
              onClick={onStartEditProvider}
              className="self-end pb-1 text-text-muted hover:text-text-primary transition-colors"
            >
              <svg className="w-4 h-4" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.066 2.573c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.573 1.066c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.066-2.573c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
              </svg>
            </button>
          </div>
        )}
        <div>
          <div className="text-xs text-text-muted">Mode</div>
          <select
            value={session?.mode || ChatSessionMode.Build}
            onChange={onModeChange}
            disabled={isUpdatingMode}
            className="w-full mt-1 px-2 py-1.5 bg-bg-tertiary border border-border-default rounded text-text-primary text-sm focus:border-brand focus:outline-none disabled:opacity-50 disabled:cursor-not-allowed"
          >
            {Object.values(ChatSessionMode).map((mode) => (
              <option key={mode} value={mode}>
                {mode.charAt(0).toUpperCase() + mode.slice(1)}
              </option>
            ))}
          </select>
        </div>
        <div>
          <div className="text-xs text-text-muted">Reasoning</div>
          <select
            value={sessionReasoningEffort}
            onChange={onReasoningChange}
            disabled={isUpdatingReasoning || !getSelectedModelCapabilities()?.hasThinking}
            className="w-full mt-1 px-2 py-1.5 bg-bg-tertiary border border-border-default rounded text-text-primary text-sm focus:border-brand focus:outline-none disabled:opacity-50 disabled:cursor-not-allowed"
            title={
              !getSelectedModelCapabilities()?.hasThinking
                ? "Selected model does not support reasoning"
                : "Controls how much the model thinks before responding"
            }
          >
            <option value="off">Off</option>
            <option value="low">Low</option>
            <option value="medium">Medium</option>
            <option value="high">High</option>
          </select>
        </div>
        {providers.find(p => p._id === selectedProviderId)?.apiType !== 'openai' && (
          <div>
            <div className="text-xs text-text-muted">Context Window</div>
            <div className="flex items-center gap-2 mt-1">
              <input
                type="range"
                min={16384}
                max={getSelectedModel()?.contextWindow || 131072}
                step={8192}
                value={sessionNumCtx}
                onChange={onNumCtxChange}
                onMouseUp={onNumCtxCommit}
                onTouchEnd={onNumCtxCommit}
                className="flex-1 h-2 bg-bg-tertiary rounded appearance-none cursor-pointer accent-brand"
              />
              <span className="text-xs text-text-secondary w-16 text-right tabular-nums">
                {sessionNumCtx.toLocaleString()}
              </span>
            </div>
          </div>
        )}
        <div>
          <div className="text-xs text-text-muted">Context Window Usage</div>
          <div className="mt-1">
            <div className="flex items-center gap-1.5">
              <span className="text-[10px] font-mono text-text-muted w-3">E</span>
              <div className="flex-1 h-3 bg-bg-tertiary rounded-full overflow-hidden border border-border-subtle">
                <div
                  className={`h-full rounded-full transition-all duration-300 ${
                    usagePercent >= 80 ? 'bg-red-500' :
                    usagePercent >= 50 ? 'bg-yellow-500' :
                    'bg-green-500'
                  }`}
                  style={{ width: `${Math.min(usagePercent, 100)}%` }}
                />
              </div>
              <span className="text-[10px] font-mono text-text-muted w-3">F</span>
            </div>
            <div className="flex justify-between mt-0.5">
              <span className="text-[10px] text-text-muted tabular-nums">
                {contextWindowUsage.toLocaleString()} tokens
              </span>
              <span className="text-[10px] text-text-muted tabular-nums">
                {sessionNumCtx.toLocaleString()} max
              </span>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}