"use client";

import { useState } from "react";

export default function ControlBar({
  onEnrich,
  onApplyChanges,
  onDownload,
  enriched,
  loading,
  loadingMessage,
  headingFontSize,
  onFontSizeChange,
  classifications,
}) {
  const [showPromptEditor, setShowPromptEditor] = useState(false);
  const [customPrompt, setCustomPrompt] = useState("");
  const [model, setModel] = useState("llama3");

  const headingCount = classifications.filter((c) => c.isHeading).length;

  const handleEnrich = () => {
    onEnrich(model, customPrompt || undefined);
  };

  const handleApplyManualChanges = () => {
    const headingIndices = classifications
      .filter((c) => c.isHeading)
      .map((c) => c.index);
    onApplyChanges(headingIndices);
  };

  return (
    <div
      className="border-b px-5 py-3"
      style={{
        background: "var(--bg-primary)",
        borderColor: "var(--border-color)",
      }}
    >
      {/* Main controls row */}
      <div className="flex items-center justify-between gap-4">
        <div className="flex items-center gap-3">
          {/* Enrich / Re-enrich button */}
          <button
            onClick={handleEnrich}
            disabled={loading}
            className="text-sm font-medium px-4 py-2 rounded-lg transition-colors cursor-pointer disabled:opacity-50 disabled:cursor-not-allowed"
            style={{
              background: "var(--accent)",
              color: "var(--bg-secondary)",
            }}
            onMouseEnter={(e) => {
              if (!loading) e.target.style.background = "var(--accent-hover)";
            }}
            onMouseLeave={(e) => {
              e.target.style.background = "var(--accent)";
            }}
          >
            {enriched ? "⟳ Re-Enrich with AI" : "✦ Enrich with AI"}
          </button>

          {/* Apply manual changes */}
          {enriched && (
            <button
              onClick={handleApplyManualChanges}
              disabled={loading}
              className="text-sm px-4 py-2 rounded-lg transition-colors cursor-pointer disabled:opacity-50"
              style={{
                background: "var(--bg-tertiary)",
                color: "var(--text-primary)",
              }}
              onMouseEnter={(e) => {
                if (!loading) e.target.style.background = "var(--bg-hover)";
              }}
              onMouseLeave={(e) => {
                e.target.style.background = "var(--bg-tertiary)";
              }}
            >
              Apply Changes
            </button>
          )}

          {/* Download button */}
          {enriched && (
            <button
              onClick={onDownload}
              disabled={loading}
              className="text-sm px-4 py-2 rounded-lg transition-colors cursor-pointer disabled:opacity-50"
              style={{
                background: "var(--bg-tertiary)",
                color: "var(--success)",
              }}
              onMouseEnter={(e) => {
                if (!loading) e.target.style.background = "var(--bg-hover)";
              }}
              onMouseLeave={(e) => {
                e.target.style.background = "var(--bg-tertiary)";
              }}
            >
              ↓ Download Enriched
            </button>
          )}
        </div>

        <div className="flex items-center gap-4">
          {/* Heading count badge */}
          {enriched && (
            <span
              className="text-xs px-2.5 py-1 rounded-full"
              style={{
                background: "var(--heading-highlight)",
                color: "var(--accent)",
              }}
            >
              {headingCount} heading{headingCount !== 1 ? "s" : ""} detected
            </span>
          )}

          {/* Font size control */}
          <div className="flex items-center gap-2">
            <label
              className="text-xs"
              style={{ color: "var(--text-secondary)" }}
            >
              Heading size:
            </label>
            <select
              value={headingFontSize}
              onChange={(e) => onFontSizeChange(Number(e.target.value))}
              className="text-xs px-2 py-1 rounded border outline-none cursor-pointer"
              style={{
                background: "var(--bg-tertiary)",
                borderColor: "var(--border-color)",
                color: "var(--text-primary)",
              }}
            >
              <option value={14}>14pt</option>
              <option value={16}>16pt</option>
              <option value={18}>18pt</option>
              <option value={20}>20pt</option>
              <option value={22}>22pt</option>
              <option value={24}>24pt</option>
              <option value={28}>28pt</option>
            </select>
          </div>

          {/* Model selector */}
          <div className="flex items-center gap-2">
            <label
              className="text-xs"
              style={{ color: "var(--text-secondary)" }}
            >
              Model:
            </label>
            <input
              type="text"
              value={model}
              onChange={(e) => setModel(e.target.value)}
              className="text-xs px-2 py-1 rounded border outline-none w-28"
              style={{
                background: "var(--bg-tertiary)",
                borderColor: "var(--border-color)",
                color: "var(--text-primary)",
              }}
              placeholder="llama3"
            />
          </div>

          {/* Custom prompt toggle */}
          <button
            onClick={() => setShowPromptEditor(!showPromptEditor)}
            className="text-xs px-3 py-1.5 rounded-lg transition-colors cursor-pointer"
            style={{
              background: showPromptEditor
                ? "var(--accent)"
                : "var(--bg-tertiary)",
              color: showPromptEditor
                ? "var(--bg-secondary)"
                : "var(--text-secondary)",
            }}
          >
            {showPromptEditor ? "Hide Prompt" : "Custom Prompt"}
          </button>
        </div>
      </div>

      {/* Custom prompt editor (collapsible) */}
      {showPromptEditor && (
        <div className="mt-3 pt-3 border-t" style={{ borderColor: "var(--border-color)" }}>
          <label
            className="text-xs block mb-2"
            style={{ color: "var(--text-secondary)" }}
          >
            Custom system prompt for heading detection (leave empty for default):
          </label>
          <textarea
            value={customPrompt}
            onChange={(e) => setCustomPrompt(e.target.value)}
            rows={4}
            className="w-full text-xs px-3 py-2 rounded-lg border outline-none resize-y"
            style={{
              background: "var(--bg-tertiary)",
              borderColor: "var(--border-color)",
              color: "var(--text-primary)",
            }}
            placeholder={`You are a document structure analyzer specializing in SOP documents.\n\nYour task: Given a list of numbered paragraphs, identify which ones are HEADINGS vs body text.\n\nRespond with ONLY a JSON object: {"headings": [array of index numbers]}`}
          />
          <p className="text-xs mt-1" style={{ color: "var(--text-muted)" }}>
            The prompt must instruct the model to return JSON with a
            &quot;headings&quot; array of paragraph index numbers.
          </p>
        </div>
      )}
    </div>
  );
}