import React, { useEffect, useState } from 'react';
import {
  View,
  Text,
  TextInput,
  ScrollView,
  TouchableOpacity,
  Modal,
  KeyboardAvoidingView,
  Platform,
} from 'react-native';
import { useSafeAreaInsets } from 'react-native-safe-area-context';
import * as Haptics from 'expo-haptics';
import { Recipe, ColorAdjustments, BaseFilter } from '../types';
import { DEFAULT_ADJUSTMENTS, FILM_SIMS } from '../utils/defaultRecipes';

// "CREATE" quick-input form shown above the viewfinder. Numeric knobs are
// plain textboxes (typed fast, one row each), categorical knobs are chip
// dropdowns. Used to enter Fuji-style recipes (DR/Highlight/Shadow/Color/NR/
// Sharpness/Clarity/Grain/CC/CCB/WB+shift/ISO/EV) without touching sliders.

const haptic = () => Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);

interface RecipeCreateModalProps {
  visible: boolean;
  // Id of the currently applied film sim (or bundled recipe whose look should
  // prefill the SIMULATION row); undefined → default to PROVIPES.
  currentBase?: BaseFilter;
  // The look live on screen. CREATE opens on THESE values (not on the sim's
  // standard ones) so a recipe is a snapshot of what the user is looking at;
  // every knob the form has no row for rides along on SAVE.
  current?: ColorAdjustments | null;
  // When set the form opens as an EDITOR: every row (name included) is
  // prefilled from this recipe instead of the sim's standard values, and
  // SAVE hands the edited copy back for the caller to store.
  initial?: Recipe | null;
  onClose: () => void;
  onSave: (recipe: Omit<Recipe, 'id' | 'isCustom'>) => void;
}

// WB presets mirror the WB-tab chips but keep pure presets (no -R variants —
// those are the separate Red/Blue offset textboxes below).
const WB_PRESETS: { key: string; label: string; temperature: number; tint: number }[] = [
  { key: 'auto', label: 'AUTO', temperature: 5500, tint: 0 },
  { key: 'daylight', label: 'DAYLIGHT', temperature: 5500, tint: 0 },
  { key: 'cloudy', label: 'CLOUDY', temperature: 6500, tint: 1 },
  { key: 'shade', label: 'SHADE', temperature: 8000, tint: 2 },
  { key: 'tungsten', label: 'TUNGSTEN', temperature: 3200, tint: 0 },
  { key: 'fluor', label: 'FLUOR', temperature: 4000, tint: 3 },
];
const WB_KEYS = WB_PRESETS.map((w) => w.key);

const DR_OPTS = [
  { v: 'auto', d: 'AUTO' },
  { v: '100', d: 'DR100' },
  { v: '200', d: 'DR200' },
  { v: '400', d: 'DR400' },
] as const;
const CC_OPTS = [
  { v: 'none', d: 'OFF' },
  { v: 'weak', d: 'WEAK' },
  { v: 'strong', d: 'STRONG' },
] as const;
const GRAIN_OPTS = [
  { v: '0', d: 'OFF' },
  { v: '3', d: 'WEAK' },
  { v: '6', d: 'STRONG' },
] as const;

// ISO has no manual control path on this build (the vision-camera lib only
// exposes exposure locking on iOS; Android CameraX keeps ISO automatic), so the
// modal shows AUTO. If a native path ever appears, feed isoSupported=true and
// the row below turns into a selectable chip list.
const ISO_SUPPORTED = false;
const ISO_STOPS = [200, 400, 800, 1600, 3200, 6400];

const clamp = (v: number, lo: number, hi: number) => Math.max(lo, Math.min(hi, v));
const int = (s: string, fallback: number, lo: number, hi: number) => {
  const n = parseInt(s, 10);
  return Number.isFinite(n) ? clamp(n, lo, hi) : fallback;
};

interface ChipProps {
  label: string;
  active: boolean;
  onPress: () => void;
  disabled?: boolean;
}
const Chip = ({ label, active, onPress, disabled }: ChipProps) => (
  <TouchableOpacity
    onPress={() => { if (!disabled) { haptic(); onPress(); } }}
    className={`mx-0.5 rounded-full border px-2.5 py-1 ${
      disabled
        ? 'border-zinc-800 bg-black/30'
        : active
          ? 'border-amber-500/70 bg-amber-500/15'
          : 'border-zinc-700/60 bg-titan/80'
    }`}
    activeOpacity={0.7}
  >
    <Text
      className={`font-mono text-[10px] font-bold tracking-wide ${
        disabled ? 'text-zinc-600' : active ? 'text-amber-500' : 'text-zinc-300'
      }`}
    >
      {label}
    </Text>
  </TouchableOpacity>
);

const ChipRow = ({ children }: { children: React.ReactNode }) => (
  <ScrollView
    horizontal
    showsHorizontalScrollIndicator={false}
    contentContainerStyle={{ alignItems: 'center', paddingVertical: 2 }}
  >
    {children}
  </ScrollView>
);

const LABEL_W = 132;

interface NumRowProps {
  label: string;
  value: string;
  onChange: (s: string) => void;
  placeholder?: string;
  width?: number;
}
const NumRow = ({ label, value, onChange, placeholder, width = 58 }: NumRowProps) => (
  <View style={{ width: '48%' }} className="mb-1.5">
    <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mb-0.5">
      {label}
    </Text>
    <TextInput
      value={value}
      onChangeText={onChange}
      selectTextOnFocus
      keyboardType="numbers-and-punctuation"
      placeholder={placeholder ?? '0'}
      placeholderTextColor="#52525b"
      className="bg-carbon border border-zinc-800 rounded-md px-2 py-1 text-white font-mono text-sm text-right"
      style={{ width }}
    />
  </View>
);

export default function RecipeCreateModal({
  visible,
  currentBase,
  current,
  initial,
  onClose,
  onSave,
}: RecipeCreateModalProps) {
  const insets = useSafeAreaInsets();
  // Seed from what the user is LOOKING AT: the recipe being edited, else the live
  // adjustments, else the current sim's standard values. Seeding from the sim's
  // standard values alone (the old behaviour) meant the form showed — and SAVE
  // wrote — neutral numbers for knobs the user had already dialled in.
  const seedBase: BaseFilter =
    initial?.baseFilter ??
    (currentBase && FILM_SIMS.some((s) => s.baseFilter === currentBase) ? currentBase : 'provia');
  const seedAdj: ColorAdjustments =
    initial?.adjustments ??
    current ??
    FILM_SIMS.find((s) => s.baseFilter === seedBase)?.adjustments ??
    DEFAULT_ADJUSTMENTS;

  // Every sim's standard values as form state — used to seed the modal and to
  // reload the form when the SIMULATION chip changes.
  const valuesOf = (b: BaseFilter, src?: ColorAdjustments) => {
    const s = src ?? FILM_SIMS.find((x) => x.baseFilter === b)?.adjustments ?? DEFAULT_ADJUSTMENTS;
    return {
      dr: String(s.dynamicRange ?? 'auto'),
      // Raw, not rounded to the three chips: a look sitting on grain 2 must not
      // become 3 just because the form was opened (and the chip row below shows
      // that value as its own chip when it is none of OFF/WEAK/STRONG).
      grain: String(s.grain ?? 0),
      cc: s.colorChrome ?? 'none',
      ccb: s.colorChromeBlue ?? 'none',
      // 'custom' = a WB the six chips do not name (a hand-set 6300K, say). It
      // keeps its own chip and its own value; the old AUTO fallback rewrote the
      // recipe's WB to 5500K on every save.
      wbKey: WB_KEYS.find((k) => {
        const p = WB_PRESETS.find((w) => w.key === k)!;
        return p.temperature === s.temperature && p.tint === s.tint;
      }) ?? 'custom',
      highlight: String(s.highlight),
      shadow: String(s.shadow),
      color: String(s.saturation),
      nr: String(s.denoise),
      sharp: String(s.sharpening),
      clarity: String(s.clarity),
      ev: String(s.exposureCompensation),
    };
  };

  const [sim, setSim] = useState<BaseFilter>(seedBase);
  const [name, setName] = useState('');
  const [dr, setDr] = useState<string>(seedAdj.dynamicRange == null ? 'auto' : String(seedAdj.dynamicRange));
  const [grain, setGrain] = useState<string>(String(seedAdj.grain ?? 0));
  const [cc, setCc] = useState<string>(seedAdj.colorChrome ?? 'none');
  const [ccb, setCcb] = useState<string>(seedAdj.colorChromeBlue ?? 'none');
  const [wbKey, setWbKey] = useState<string>(
    WB_KEYS.find((k) => {
      const p = WB_PRESETS.find((w) => w.key === k)!;
      return p.temperature === seedAdj.temperature && p.tint === seedAdj.tint;
    }) ?? 'custom'
  );
  const [wbRed, setWbRed] = useState('0');
  const [wbBlue, setWbBlue] = useState('0');
  const [fHigh, setFHigh] = useState(String(seedAdj.highlight));
  const [fShadow, setFShadow] = useState(String(seedAdj.shadow));
  const [fColor, setFColor] = useState(String(seedAdj.saturation));
  const [fNr, setFNr] = useState(String(seedAdj.denoise));
  const [fSharp, setFSharp] = useState(String(seedAdj.sharpening));
  const [fClarity, setFClarity] = useState(String(seedAdj.clarity));
  const [fEv, setFEv] = useState(String(seedAdj.exposureCompensation));
  const [iso, setIso] = useState<number | null>(null);

  // Re-seed whenever the modal opens (or the applied look changes) so CREATE
  // quick-input always starts from the current simulation.
  useEffect(() => {
    if (!visible) return;
    // Editing a stored recipe wins over the live sim seed: the form must show
    // that recipe's own values, not the sim's standard ones.
    const base = initial?.baseFilter ?? seedBase;
    const v = valuesOf(base, seedAdj);
    setSim(base);
    setDr(v.dr);
    setGrain(v.grain);
    setCc(v.cc);
    setCcb(v.ccb);
    setWbKey(v.wbKey);
    setWbRed(String(seedAdj.wbRed ?? 0));
    setWbBlue(String(seedAdj.wbBlue ?? 0));
    setFHigh(v.highlight);
    setFShadow(v.shadow);
    setFColor(v.color);
    setFNr(v.nr);
    setFSharp(v.sharp);
    setFClarity(v.clarity);
    setFEv(v.ev);
    setName(initial?.name ?? '');
    setIso(null);
  }, [visible, currentBase, initial]);

  // Switching the simulation reloads its standard values into the form — not
  // in the editor though: there the numbers on screen are the user's own, and
  // swapping the base look under them must not throw them away.
  const selectSim = (b: BaseFilter) => {
    setSim(b);
    if (initial) return;
    const v = valuesOf(b);
    setDr(v.dr);
    setGrain(v.grain);
    setCc(v.cc);
    setCcb(v.ccb);
    setWbKey(v.wbKey);
    setFHigh(v.highlight);
    setFShadow(v.shadow);
    setFColor(v.color);
    setFNr(v.nr);
    setFSharp(v.sharp);
    setFClarity(v.clarity);
    setFEv(v.ev);
  };

  const handleSave = () => {
    const wb = WB_PRESETS.find((w) => w.key === wbKey);
    const simAdj = FILM_SIMS.find((s) => s.baseFilter === sim)?.adjustments ?? DEFAULT_ADJUSTMENTS;
    // The base is what the user was looking at (CREATE) or the recipe being
    // edited. Spreading the sim's neutral values here instead — the old
    // behaviour — silently zeroed every knob the form has no row for: exposure,
    // contrast, vibrance, vignetting, glow, the WB red/blue shift. That is what
    // made a saved recipe apply a different look from the one on screen.
    const adj: ColorAdjustments = {
      ...DEFAULT_ADJUSTMENTS,
      ...seedAdj,
      // A WB with no preset of its own keeps the value it was seeded with.
      temperature: wb ? wb.temperature : seedAdj.temperature,
      tint: wb ? wb.tint : seedAdj.tint,
      wbRed: int(wbRed, 0, -9, 9),
      wbBlue: int(wbBlue, 0, -9, 9),
      highlight: int(fHigh, simAdj.highlight, -10, 10),
      shadow: int(fShadow, simAdj.shadow, -10, 10),
      saturation: int(fColor, simAdj.saturation, -10, 10),
      denoise: int(fNr, simAdj.denoise, 0, 10),
      sharpening: int(fSharp, simAdj.sharpening, 0, 10),
      clarity: int(fClarity, simAdj.clarity, -10, 10),
      grain: int(grain, seedAdj.grain, 0, 10),
      colorChrome: cc as ColorAdjustments['colorChrome'],
      colorChromeBlue: ccb as ColorAdjustments['colorChromeBlue'],
      dynamicRange: (dr === 'auto' ? 'auto' : parseInt(dr, 10)) as ColorAdjustments['dynamicRange'],
      exposureCompensation: int(fEv, simAdj.exposureCompensation, -3, 3),
    };
    onSave({
      name: name.trim() || initial?.name || 'NEW RECIPE',
      baseFilter: sim,
      adjustments: adj,
      // An edit keeps the recipe's own frame and geotag choice; a fresh
      // CREATE keeps the old defaults.
      frameId: initial?.frameId ?? 'none',
      useGeotag: initial?.useGeotag ?? true,
      ...(initial?.cinema ? { cinema: initial.cinema } : {}),
    });
    setName('');
    onClose();
  };

  const fieldSets: { label: string; value: string; set: (s: string) => void; ph?: string }[] = [
    { label: 'HIGHLIGHT', value: fHigh, set: setFHigh },
    { label: 'SHADOW', value: fShadow, set: setFShadow },
    { label: 'COLOR', value: fColor, set: setFColor },
    { label: 'NOISE RED.', value: fNr, set: setFNr, ph: '0-10' },
    { label: 'SHARPENING', value: fSharp, set: setFSharp, ph: '0-10' },
    { label: 'CLARITY', value: fClarity, set: setFClarity },
    { label: 'EXPOSURE COMP.', value: fEv, set: setFEv, ph: 'EV' },
  ];

  return (
    <Modal transparent animationType="slide" visible={visible} onRequestClose={onClose}>
      <View className="absolute inset-0 bg-black/60" />
      <KeyboardAvoidingView style={{ flex: 1 }} behavior={Platform.OS === 'ios' ? 'padding' : 'height'}>
        <View
          style={{ paddingTop: insets.top + 12, paddingBottom: insets.bottom + 12, maxHeight: '100%' }}
          className="bg-titan border-b border-zinc-800 rounded-b-3xl px-4 pt-1"
        >
          <View className="flex-row items-center justify-between mb-2">
            <Text className="text-white font-mono text-sm font-bold tracking-wider">
              {initial ? 'EDIT RECIPE' : 'CREATE RECIPE'}
            </Text>
            <TouchableOpacity onPress={onClose} className="px-2 py-1" activeOpacity={0.7}>
              <Text className="text-zinc-400 font-mono text-xs font-bold">✕</Text>
            </TouchableOpacity>
          </View>

          <ScrollView showsVerticalScrollIndicator={false} contentContainerStyle={{ paddingBottom: 8 }}>
            {/* Name */}
            <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mb-0.5">NAME</Text>
            <TextInput
              value={name}
              onChangeText={setName}
              selectTextOnFocus
              placeholder="Recipe name (e.g. Fuji Retro)"
              placeholderTextColor="#71717a"
              className="bg-carbon border border-zinc-800 rounded-lg p-2 text-white font-mono text-sm mb-2"
            />

            {/* Simulation */}
            <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mb-0.5">SIMULATION</Text>
            <ChipRow>
              {FILM_SIMS.map((s) => (
                <Chip key={s.id} label={s.name} active={sim === s.baseFilter} onPress={() => selectSim(s.baseFilter)} />
              ))}
            </ChipRow>

            {/* Dynamic range */}
            <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mt-1.5 mb-0.5">DYNAMIC RANGE</Text>
            <ChipRow>
              {DR_OPTS.map((o) => (
                <Chip key={o.v} label={o.d} active={dr === o.v} onPress={() => setDr(o.v)} />
              ))}
            </ChipRow>

            {/* Numeric textboxes — 2 per row */}
            <View className="flex-row flex-wrap justify-between mt-1.5">
              {fieldSets.map((f) => (
                <NumRow key={f.label} label={f.label} value={f.value} onChange={f.set} placeholder={f.ph} />
              ))}
            </View>

            {/* Grain / chrome */}
            <View className="mt-1">
              <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mb-0.5">GRAIN EFFECT</Text>
              <ChipRow>
                {GRAIN_OPTS.map((o) => (
                  <Chip key={o.v} label={o.d} active={grain === o.v} onPress={() => setGrain(o.v)} />
                ))}
                {!GRAIN_OPTS.some((o) => o.v === grain) && (
                  <Chip label={grain} active onPress={() => {}} />
                )}
              </ChipRow>
              <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mt-1.5 mb-0.5">COLOR CHROME EFFECT</Text>
              <ChipRow>
                {CC_OPTS.map((o) => (
                  <Chip key={o.v} label={o.d} active={cc === o.v} onPress={() => setCc(o.v)} />
                ))}
              </ChipRow>
              <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mt-1.5 mb-0.5">COLOR CHROME EFFECT BLUE</Text>
              <ChipRow>
                {CC_OPTS.map((o) => (
                  <Chip key={o.v} label={o.d} active={ccb === o.v} onPress={() => setCcb(o.v)} />
                ))}
              </ChipRow>
            </View>

            {/* White balance + R/B shift */}
            <Text className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest mt-1.5 mb-0.5">WHITE BALANCE</Text>
            <ChipRow>
              {WB_PRESETS.map((w) => (
                <Chip key={w.key} label={w.label} active={wbKey === w.key} onPress={() => setWbKey(w.key)} />
              ))}
              {wbKey === 'custom' && (
                <Chip label={`${seedAdj.temperature}K`} active onPress={() => setWbKey('custom')} />
              )}
            </ChipRow>
            <View className="flex-row items-center mt-1">
              <Text style={{ width: LABEL_W }} className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest">
                WB SHIFT
              </Text>
              <Text className="text-zinc-500 font-mono text-[9px] mr-1.5">RED</Text>
              <TextInput
                value={wbRed}
                onChangeText={setWbRed}
                selectTextOnFocus
                keyboardType="numbers-and-punctuation"
                placeholder="-9..9"
                placeholderTextColor="#52525b"
                className="bg-carbon border border-zinc-800 rounded-md px-2 py-1 text-white font-mono text-sm text-right mr-3"
                style={{ width: 52 }}
              />
              <Text className="text-zinc-500 font-mono text-[9px] mr-1.5">BLUE</Text>
              <TextInput
                value={wbBlue}
                onChangeText={setWbBlue}
                selectTextOnFocus
                keyboardType="numbers-and-punctuation"
                placeholder="-9..9"
                placeholderTextColor="#52525b"
                className="bg-carbon border border-zinc-800 rounded-md px-2 py-1 text-white font-mono text-sm text-right"
                style={{ width: 52 }}
              />
            </View>

            {/* ISO */}
            <View className="flex-row items-center mt-1.5 mb-1">
              <Text style={{ width: LABEL_W }} className="text-zinc-400 font-mono text-[9px] font-bold tracking-widest">
                ISO
              </Text>
              {ISO_SUPPORTED ? (
                <ChipRow>
                  <Chip label="AUTO" active={iso === null} onPress={() => setIso(null)} />
                  {ISO_STOPS.map((s) => (
                    <Chip key={s} label={String(s)} active={iso === s} onPress={() => setIso(s)} />
                  ))}
                </ChipRow>
              ) : (
                <Chip label="AUTO (camera default)" active disabled onPress={() => {}} />
              )}
            </View>
          </ScrollView>

          <View className="flex-row space-x-3 mt-2">
            <TouchableOpacity onPress={onClose} className="flex-1 bg-zinc-800 py-3 rounded-lg items-center" activeOpacity={0.7}>
              <Text className="text-zinc-300 font-mono text-xs font-semibold">CANCEL</Text>
            </TouchableOpacity>
            <TouchableOpacity onPress={handleSave} className="flex-1 bg-amber-500 py-3 rounded-lg items-center" activeOpacity={0.7}>
              <Text className="text-black font-mono text-xs font-bold">{initial ? 'SAVE' : 'SAVE RECIPE'}</Text>
            </TouchableOpacity>
          </View>
        </View>
      </KeyboardAvoidingView>
    </Modal>
  );
}