import { useState } from 'react';
import { Alert, Pressable, ScrollView, StyleSheet, Text, TextInput, View } from 'react-native';
import * as Clipboard from 'expo-clipboard';
import type { MobileWorkspace } from '../../api/workspaces';
import { useNotesStore, type NotesState } from '../../store/notes-store';
import { useWorkspaceStore, type WorkspaceState } from '../../store/workspace-store';
import { extractFromUrl, copilotTransform } from '../../api/note-prompts';
import { colors } from '../../theme';

type CaptureMode = 'text' | 'photo' | 'voice' | 'url' | 'scan' | 'paste';

const CAPTURE_MODES: { mode: CaptureMode; label: string; icon: string; description: string }[] = [
  { mode: 'text', label: 'Text', icon: '✏️', description: 'Type a quick note' },
  { mode: 'photo', label: 'Photo', icon: '📷', description: 'Capture from camera' },
  { mode: 'voice', label: 'Voice', icon: '🎙️', description: 'Record & transcribe' },
  { mode: 'url', label: 'URL', icon: '🔗', description: 'Extract from web page' },
  { mode: 'scan', label: 'Scan', icon: '📄', description: 'Scan multi-page doc' },
  { mode: 'paste', label: 'Paste', icon: '📋', description: 'Paste & clean up' },
];

export default function CaptureScreen() {
  const [mode, setMode] = useState<CaptureMode>('text');
  const [title, setTitle] = useState('');
  const [body, setBody] = useState('');
  const [urlInput, setUrlInput] = useState('');
  const [saved, setSaved] = useState(false);
  const [busy, setBusy] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const saveDraft = useNotesStore((state: NotesState) => state.saveDraft);
  const workspaces = useWorkspaceStore((state: WorkspaceState) => state.workspaces);
  const activeWorkspaceId = useWorkspaceStore((state: WorkspaceState) => state.activeWorkspaceId);
  const setActiveWorkspace = useWorkspaceStore((state: WorkspaceState) => state.setActiveWorkspace);
  const activeWorkspaceName =
    workspaces.find((workspace: MobileWorkspace) => workspace.id === activeWorkspaceId)?.name ?? 'Drafts';

  const resetForm = () => {
    setTitle('');
    setBody('');
    setUrlInput('');
    setSaved(false);
    setError(null);
  };

  const handleSave = async () => {
    if (!activeWorkspaceId) return;
    setBusy(true);
    try {
      const didSave = await saveDraft(activeWorkspaceId, title, body);
      setSaved(didSave);
      if (didSave) resetForm();
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Save failed');
    } finally {
      setBusy(false);
    }
  };

  const handleUrlExtract = async () => {
    if (!activeWorkspaceId || !urlInput.trim()) return;
    setBusy(true);
    setError(null);
    try {
      const result = await extractFromUrl(urlInput.trim(), activeWorkspaceId);
      setTitle(result.title);
      setBody(result.content);
    } catch (e) {
      setError(e instanceof Error ? e.message : 'URL extraction failed');
    } finally {
      setBusy(false);
    }
  };

  const handlePasteAndClean = async () => {
    if (!activeWorkspaceId) return;
    setBusy(true);
    setError(null);
    try {
      const clipText = await Clipboard.getStringAsync();
      if (!clipText?.trim()) {
        setError('Clipboard is empty');
        setBusy(false);
        return;
      }
      // Check if it looks like a URL
      if (/^https?:\/\//.test(clipText.trim())) {
        setUrlInput(clipText.trim());
        setMode('url');
        setBusy(false);
        return;
      }
      setBody(clipText);
      setTitle('Pasted note');
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Paste failed');
    } finally {
      setBusy(false);
    }
  };

  const handleVoiceCapture = () => {
    Alert.alert('Voice Capture', 'Voice recording requires expo-av. Install expo-av and grant microphone permission to enable this feature.', [{ text: 'OK' }]);
  };

  const handlePhotoCapture = () => {
    Alert.alert('Photo Capture', 'Camera capture requires expo-image-picker. Install the package and grant camera permission to enable this feature.', [{ text: 'OK' }]);
  };

  const handleScanCapture = () => {
    Alert.alert('Document Scan', 'Multi-page scanning requires expo-image-picker with continuous mode. Install the package to enable this feature.', [{ text: 'OK' }]);
  };

  return (
    <ScrollView style={styles.container} contentContainerStyle={styles.contentContainer}>
      <Text style={styles.title}>Quick capture</Text>

      {/* Workspace selector */}
      <View style={styles.workspaceRow}>
        {workspaces.map((workspace: MobileWorkspace) => {
          const isActive = workspace.id === activeWorkspaceId;
          return (
            <Pressable
              accessibilityLabel={`Select workspace ${workspace.name}`}
              key={workspace.id}
              onPress={() => setActiveWorkspace(workspace.id)}
              style={[styles.workspaceChip, isActive ? styles.workspaceChipActive : null]}
            >
              <Text style={[styles.workspaceChipText, isActive ? styles.workspaceChipTextActive : null]}>
                {workspace.name}
              </Text>
            </Pressable>
          );
        })}
      </View>

      {/* Capture mode selector — 6 modes */}
      <View style={styles.modeGrid}>
        {CAPTURE_MODES.map(({ mode: m, label, icon, description }) => {
          const isActive = m === mode;
          return (
            <Pressable
              key={m}
              accessibilityLabel={`${label} capture mode: ${description}`}
              onPress={() => { setMode(m); resetForm(); }}
              style={[styles.modeCard, isActive ? styles.modeCardActive : null]}
            >
              <Text style={styles.modeIcon}>{icon}</Text>
              <Text style={[styles.modeLabel, isActive ? styles.modeLabelActive : null]}>{label}</Text>
            </Pressable>
          );
        })}
      </View>

      {/* Mode-specific content */}
      {mode === 'text' && (
        <>
          <TextInput value={title} onChangeText={setTitle} placeholder="Draft title" placeholderTextColor={colors.textTertiary} style={styles.input} />
          <TextInput value={body} onChangeText={setBody} placeholder="Capture a thought, task, or note" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
        </>
      )}

      {mode === 'url' && (
        <>
          <TextInput value={urlInput} onChangeText={setUrlInput} placeholder="https://example.com/article" placeholderTextColor={colors.textTertiary} style={styles.input} autoCapitalize="none" keyboardType="url" />
          <Pressable accessibilityLabel="Extract content from URL" onPress={handleUrlExtract} disabled={busy || !urlInput.trim()} style={[styles.button, busy ? styles.buttonDisabled : null]}>
            <Text style={styles.buttonText}>{busy ? 'Extracting...' : 'Extract & Summarize'}</Text>
          </Pressable>
          {body ? (
            <>
              <TextInput value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
              <TextInput value={body} onChangeText={setBody} placeholder="Extracted content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
            </>
          ) : null}
        </>
      )}

      {mode === 'paste' && (
        <>
          <Pressable accessibilityLabel="Read clipboard and clean text" onPress={handlePasteAndClean} disabled={busy} style={[styles.button, busy ? styles.buttonDisabled : null]}>
            <Text style={styles.buttonText}>{busy ? 'Reading clipboard...' : 'Paste & Clean'}</Text>
          </Pressable>
          {body ? (
            <>
              <TextInput value={title} onChangeText={setTitle} placeholder="Title" placeholderTextColor={colors.textTertiary} style={styles.input} />
              <TextInput value={body} onChangeText={setBody} placeholder="Cleaned content" placeholderTextColor={colors.textTertiary} style={[styles.input, styles.bodyInput]} multiline textAlignVertical="top" />
            </>
          ) : null}
        </>
      )}

      {mode === 'voice' && (
        <View style={styles.card}>
          <Text style={styles.cardTitle}>Voice-to-Note</Text>
          <Text style={styles.cardBody}>Record audio and transcribe to text. Requires expo-av for audio recording.</Text>
          <Pressable accessibilityLabel="Start voice recording" onPress={handleVoiceCapture} style={styles.button}>
            <Text style={styles.buttonText}>Start Recording</Text>
          </Pressable>
        </View>
      )}

      {mode === 'photo' && (
        <View style={styles.card}>
          <Text style={styles.cardTitle}>Screenshot-to-Note</Text>
          <Text style={styles.cardBody}>Take a photo or select from gallery. Uses vision AI for OCR and text extraction.</Text>
          <Pressable accessibilityLabel="Open camera for photo capture" onPress={handlePhotoCapture} style={styles.button}>
            <Text style={styles.buttonText}>Open Camera</Text>
          </Pressable>
        </View>
      )}

      {mode === 'scan' && (
        <View style={styles.card}>
          <Text style={styles.cardTitle}>Document Scan</Text>
          <Text style={styles.cardBody}>Photograph multiple pages of a document. Each page is processed with vision AI and combined into a single note.</Text>
          <Pressable accessibilityLabel="Start document scan" onPress={handleScanCapture} style={styles.button}>
            <Text style={styles.buttonText}>Start Scanning</Text>
          </Pressable>
        </View>
      )}

      {/* Error display */}
      {error ? <Text style={styles.error}>{error}</Text> : null}

      {/* Save button (shown when we have content to save) */}
      {(mode === 'text' || body) && (
        <Pressable
          accessibilityLabel={activeWorkspaceId ? 'Save draft note' : 'Select workspace before saving'}
          onPress={handleSave}
          disabled={!activeWorkspaceId || busy}
          style={[styles.button, (!activeWorkspaceId || busy) ? styles.buttonDisabled : null]}
        >
          <Text style={styles.buttonText}>{busy ? 'Saving...' : activeWorkspaceId ? 'Save draft' : 'Select workspace'}</Text>
        </Pressable>
      )}
      {saved ? <Text style={styles.saved}>Draft saved to the product backend.</Text> : null}
    </ScrollView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: colors.bgCanvas,
  },
  contentContainer: {
    padding: 20,
    gap: 14,
  },
  title: {
    color: colors.textPrimary,
    fontSize: 28,
    fontWeight: '700',
  },
  input: {
    borderWidth: 1,
    borderColor: colors.borderDefault,
    borderRadius: 12,
    paddingHorizontal: 14,
    paddingVertical: 12,
    color: colors.textPrimary,
    backgroundColor: colors.surfaceCard,
  },
  bodyInput: {
    minHeight: 160,
  },
  button: {
    backgroundColor: colors.accentPrimary,
    borderRadius: 12,
    paddingVertical: 14,
    alignItems: 'center',
  },
  buttonText: {
    color: colors.textPrimary,
    fontWeight: '700',
  },
  buttonDisabled: {
    opacity: 0.6,
  },
  saved: {
    color: colors.success,
    fontSize: 14,
    fontWeight: '600',
  },
  error: {
    color: colors.danger,
    fontSize: 14,
    fontWeight: '500',
  },
  card: {
    backgroundColor: colors.surfaceCard,
    borderRadius: 14,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    padding: 14,
    gap: 10,
  },
  workspaceRow: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 8,
  },
  workspaceChip: {
    borderRadius: 999,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    paddingHorizontal: 12,
    paddingVertical: 8,
    backgroundColor: colors.surfaceCard,
  },
  workspaceChipActive: {
    backgroundColor: colors.accentPrimary,
    borderColor: colors.accentPrimary,
  },
  workspaceChipText: {
    color: colors.textSecondary,
    fontSize: 13,
    fontWeight: '600',
  },
  workspaceChipTextActive: {
    color: colors.textPrimary,
  },
  modeGrid: {
    flexDirection: 'row',
    flexWrap: 'wrap',
    gap: 10,
  },
  modeCard: {
    width: '30%',
    backgroundColor: colors.surfaceCard,
    borderRadius: 14,
    borderWidth: 1,
    borderColor: colors.borderDefault,
    padding: 12,
    alignItems: 'center',
    gap: 4,
  },
  modeCardActive: {
    backgroundColor: colors.accentPrimary,
    borderColor: colors.accentPrimary,
  },
  modeIcon: {
    fontSize: 24,
  },
  modeLabel: {
    color: colors.textSecondary,
    fontSize: 12,
    fontWeight: '700',
  },
  modeLabelActive: {
    color: colors.textPrimary,
  },
  cardTitle: {
    color: colors.textPrimary,
    fontSize: 16,
    fontWeight: '700',
  },
  cardBody: {
    color: colors.textSecondary,
    fontSize: 14,
    lineHeight: 20,
  },
});