import { useEffect, useRef, useState, type RefObject } from "react";
import { CaretDown, CaretUp } from "@phosphor-icons/react";
import { commandIds } from "@commands/ids";
import type { AppStore } from "@editor/store";
import type { GenerationResourcesState } from "@editor/state";
import type { GenerateArchitecture, GenerateIntent, GenerateMode, GenerateSettings } from "@editor/tools";
import { resolveGenerationModeOptions, resolveGenerationModelOptions, resolveGenerationStringOptions, resolveGenerationSupportOptions } from "@operations/generation/options";
import { BottomControlSelectMenu, type BottomControlSelectOption } from "./SelectMenu";
import { BottomControlSlider } from "./Slider";

const architectures = [
  { value: "sdxl", label: "SDXL" },
  { value: "z-image", label: "Z-Image" },
  { value: "z-image-turbo", label: "Z-Image Turbo" },
  { value: "anima", label: "Anima" },
] satisfies readonly BottomControlSelectOption<GenerateArchitecture>[];

const modes = [
  { value: "text-to-image", label: "Text → image" },
  { value: "image-to-image", label: "Image → image" },
  { value: "inpaint", label: "Inpaint" },
  { value: "outpaint", label: "Outpaint" },
] satisfies readonly BottomControlSelectOption<GenerateMode>[];

const sizePresets = [
  { label: "1:1", w: 1024, h: 1024 },
  { label: "4:3", w: 1152, h: 896 },
  { label: "3:4", w: 896, h: 1152 },
  { label: "16:9", w: 1344, h: 768 },
  { label: "9:16", w: 768, h: 1344 },
] as const;

const inpaintPolarityOptions = [
  { value: "hidden", label: "Hidden / erased" },
  { value: "revealed", label: "Revealed / painted" },
] satisfies readonly BottomControlSelectOption<GenerateSettings["inpaint"]["maskPolarity"]>[];

const inpaintMaskedContentOptions = [
  { value: "neutral", label: "Neutral fill" },
  { value: "original", label: "Original gray" },
  { value: "originalColor", label: "Original color" },
  { value: "edges", label: "Edge map" },
] satisfies readonly BottomControlSelectOption<GenerateSettings["inpaint"]["maskedContent"]>[];

export type GenerateControlsProps = {
  settings: GenerateSettings;
  resources: GenerationResourcesState;
  dispatch: AppStore["dispatch"];
};

export function GenerateControls({ settings, resources, dispatch }: GenerateControlsProps) {
  const comfyOptions = resources.options;
  const [advancedOpen, setAdvancedOpen] = useState(false);
  const [outpaintOpen, setOutpaintOpen] = useState(false);
  const [inpaintOpen, setInpaintOpen] = useState(false);
  const [sizeOpen, setSizeOpen] = useState(false);
  const sizeRef = useRef<HTMLDivElement>(null);
  const modelOptions = resolveGenerationModelOptions(settings, comfyOptions);
  const supportOptions = resolveGenerationSupportOptions(settings, comfyOptions);
  const samplerOptions = resolveGenerationStringOptions(comfyOptions?.samplers, settings.sampler);
  const schedulerOptions = resolveGenerationStringOptions(comfyOptions?.schedulers, settings.scheduler);
  const modeOptions = resolveGenerationModeOptions(settings, comfyOptions, modes);

  useEffect(() => {
    if (!sizeOpen) return;
    const close = (event: PointerEvent) => {
      if (!sizeRef.current?.contains(event.target as Node)) setSizeOpen(false);
    };
    window.addEventListener("pointerdown", close);
    return () => window.removeEventListener("pointerdown", close);
  }, [sizeOpen]);

  return (
    <div className="grid gap-5 pb-2 tabular-nums">
      {resources.error ? <p className="rounded-md border border-red-400/15 bg-red-500/10 px-2.5 py-2 text-xs text-red-200">{resources.error}</p> : null}

      <section className={panelSectionClass()}>
        <div className="px-1">
          <h2 className="text-sm font-semibold text-white/90">Edit with AI</h2>
          <p className="mt-1 text-xs leading-5 text-white/45">Choose an outcome. Image Studio configures the matching generation workflow.</p>
        </div>
        <div className="grid grid-cols-2 gap-2">
          {intentOptions.map((intent) => (
            <button
              key={intent.value}
              type="button"
              aria-pressed={settings.mode === intent.mode}
              className={`border-l-2 px-2.5 py-1.5 text-left transition focus:outline-none focus-visible:ring-2 focus-visible:ring-sky-300/50 ${settings.mode === intent.mode ? "border-sky-300 bg-sky-300/10 text-sky-100" : "border-transparent text-white/60 hover:border-white/20 hover:text-white"}`}
              onClick={() => dispatch(commandIds.toolChooseGenerateIntent, { intent: intent.value })}
            >
              <span className="block text-sm font-semibold">{intent.label}</span>
              <span className={`mt-1 block text-xs leading-4 ${settings.mode === intent.mode ? "text-sky-100/70" : "text-white/40"}`}>{intent.description}</span>
            </button>
          ))}
          <button type="button" disabled className="border-l-2 border-transparent px-2.5 py-1.5 text-left text-white/25" title="Dedicated object removal is not supported by the current backend. Use Replace and describe the desired background.">
            <span className="block text-sm font-semibold">Remove</span>
            <span className="mt-1 block text-xs leading-4">Use Replace for now; describe what should fill the area.</span>
          </button>
        </div>
      </section>

      <section className={panelSectionClass()}>
        <label className="grid gap-2">
          <span className={panelLabelClass()}>Prompt</span>
          <textarea
            aria-label="Generate prompt"
            value={settings.prompt}
            rows={6}
            placeholder="Describe the image you want to create…"
            onChange={(event) => dispatch(commandIds.toolSetGenerateSettings, { prompt: event.currentTarget.value })}
            className={panelTextAreaClass("min-h-36")}
          />
        </label>
        <label className="grid gap-2">
          <span className={panelLabelClass()}>Negative prompt</span>
          <textarea
            aria-label="Negative prompt"
            value={settings.negativePrompt}
            rows={3}
            placeholder="Things to avoid, e.g. bad quality, artifacts…"
            onChange={(event) => dispatch(commandIds.toolSetGenerateSettings, { negativePrompt: event.currentTarget.value })}
            className={panelTextAreaClass("min-h-20")}
          />
        </label>
      </section>

      <section className={panelSectionClass()}>
        <SectionTitle title="Essentials" />
        <SizeControl refRoot={sizeRef} open={sizeOpen} setOpen={setSizeOpen} settings={settings} dispatch={dispatch} />
        {settings.mode === "image-to-image" || settings.mode === "inpaint" ? (
          <div className={panelRowClass()}>
            <span className={panelLabelClass()}>Influence</span>
            <BottomControlSlider min={0} max={100} value={settings.strength} className="w-32" aria-label="Generate strength" onValueChange={(strength) => dispatch(commandIds.toolSetGenerateSettings, { strength })} />
            <span className="w-10 text-right text-sm text-white">{Math.round(settings.strength)}</span>
          </div>
        ) : null}
      </section>

      <section className={panelSectionClass()}>
        <button type="button" className={sectionToggleClass()} aria-expanded={advancedOpen} aria-controls="generate-advanced-controls" onClick={() => setAdvancedOpen((open) => !open)}>
          <span>
            <span className="block text-sm font-semibold text-white/85">Advanced</span>
            <span className="block text-xs text-white/40">Model, backend, seed, sampling, and workflow internals</span>
          </span>
          {advancedOpen ? <CaretUp size={18} weight="bold" /> : <CaretDown size={18} weight="bold" />}
        </button>
        <div id="generate-advanced-controls" className={`grid gap-2 overflow-hidden transition-all duration-200 ${advancedOpen ? "max-h-[32rem] pt-2 opacity-100" : "max-h-0 opacity-0"}`}>
          <PanelSelect label="Mode" value={settings.mode} options={modeOptions} ariaLabel="Generate mode" onValueChange={(mode) => dispatch(commandIds.toolSetGenerateSettings, { mode })} />
          <PanelSelect label="Backend" value={settings.architecture} options={architectures} ariaLabel="Generate backend" onValueChange={(architecture) => dispatch(commandIds.toolSetGenerateSettings, { architecture })} />
          <PanelSelect label="Model" value={settings.model} options={modelOptions} ariaLabel="Generate model" onValueChange={(model) => dispatch(commandIds.toolSetGenerateSettings, { model })} />
          {settings.architecture !== "sdxl" ? (
            <>
              <PanelSelect label="Text enc." value={settings.textEncoder} options={supportOptions.textEncoders} ariaLabel="Generate text encoder" onValueChange={(textEncoder) => dispatch(commandIds.toolSetGenerateSettings, { textEncoder })} />
              <PanelSelect label="VAE" value={settings.vae} options={supportOptions.vaes} ariaLabel="Generate VAE" onValueChange={(vae) => dispatch(commandIds.toolSetGenerateSettings, { vae })} />
            </>
          ) : null}
          <PanelNumber label="Seed" aria-label="Generate seed" value={settings.seed} onValueChange={(seed) => dispatch(commandIds.toolSetGenerateSettings, { seed })} />
          <PanelSelect label="Sampler" value={settings.sampler} options={samplerOptions} ariaLabel="Generate sampler" onValueChange={(sampler) => dispatch(commandIds.toolSetGenerateSettings, { sampler })} />
          <PanelSelect label="Scheduler" value={settings.scheduler} options={schedulerOptions} ariaLabel="Generate scheduler" onValueChange={(scheduler) => dispatch(commandIds.toolSetGenerateSettings, { scheduler })} />
          <div className="grid grid-cols-2 gap-2">
            <PanelNumber label="Steps" aria-label="Generate steps" value={settings.steps} onValueChange={(steps) => dispatch(commandIds.toolSetGenerateSettings, { steps })} />
            <PanelNumber label="CFG" aria-label="Generate CFG" value={settings.cfg} onValueChange={(cfg) => dispatch(commandIds.toolSetGenerateSettings, { cfg })} />
          </div>
        </div>
      </section>

      {settings.mode === "outpaint" ? <section className={panelSectionClass()}>
        <button type="button" className={sectionToggleClass()} aria-expanded={outpaintOpen} aria-controls="generate-outpaint-controls" onClick={() => setOutpaintOpen((open) => !open)}>
          <span>
            <span className="block text-sm font-semibold text-white/85">Outpaint</span>
            <span className="block text-xs text-white/40">Padding and feathering for outpaint mode</span>
          </span>
          {outpaintOpen ? <CaretUp size={18} weight="bold" /> : <CaretDown size={18} weight="bold" />}
        </button>
        <div id="generate-outpaint-controls" className={`grid gap-2 overflow-hidden transition-all duration-200 ${outpaintOpen ? "max-h-72 pt-2 opacity-100" : "max-h-0 opacity-0"}`}>
          <div className="grid grid-cols-2 gap-2">
            <PanelNumber label="Left" aria-label="Outpaint left padding" value={settings.outpaint.left} onValueChange={(left) => dispatch(commandIds.toolSetGenerateSettings, { outpaint: { ...settings.outpaint, left } })} />
            <PanelNumber label="Top" aria-label="Outpaint top padding" value={settings.outpaint.top} onValueChange={(top) => dispatch(commandIds.toolSetGenerateSettings, { outpaint: { ...settings.outpaint, top } })} />
            <PanelNumber label="Right" aria-label="Outpaint right padding" value={settings.outpaint.right} onValueChange={(right) => dispatch(commandIds.toolSetGenerateSettings, { outpaint: { ...settings.outpaint, right } })} />
            <PanelNumber label="Bottom" aria-label="Outpaint bottom padding" value={settings.outpaint.bottom} onValueChange={(bottom) => dispatch(commandIds.toolSetGenerateSettings, { outpaint: { ...settings.outpaint, bottom } })} />
          </div>
          <PanelNumber label="Feather" aria-label="Outpaint feathering" value={settings.outpaint.feathering} onValueChange={(feathering) => dispatch(commandIds.toolSetGenerateSettings, { outpaint: { ...settings.outpaint, feathering } })} />
        </div>
      </section> : null}

      {settings.mode === "inpaint" ? <section className={panelSectionClass()}>
        <button type="button" className={sectionToggleClass()} aria-expanded={inpaintOpen} aria-controls="generate-inpaint-controls" onClick={() => setInpaintOpen((open) => !open)}>
          <span>
            <span className="block text-sm font-semibold text-white/85">Inpaint</span>
            <span className="block text-xs text-white/40">Mask polarity, crop padding, edge prep, grow</span>
          </span>
          {inpaintOpen ? <CaretUp size={18} weight="bold" /> : <CaretDown size={18} weight="bold" />}
        </button>
        <div id="generate-inpaint-controls" className={`grid gap-2 overflow-hidden transition-all duration-200 ${inpaintOpen ? "max-h-[38rem] pt-2 opacity-100" : "max-h-0 opacity-0"}`}>
          <PanelSelect
            label="Polarity"
            value={settings.inpaint.maskPolarity}
            options={inpaintPolarityOptions}
            ariaLabel="Inpaint mask polarity"
            onValueChange={(maskPolarity) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskPolarity } })}
          />
          <PanelSelect
            label="Content"
            value={settings.inpaint.maskedContent}
            options={inpaintMaskedContentOptions}
            ariaLabel="Inpaint masked content"
            onValueChange={(maskedContent) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskedContent } })}
          />
          <button type="button" className={compactRowButtonClass()} aria-pressed={settings.inpaint.maskedAreaOnly} onClick={() => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskedAreaOnly: !settings.inpaint.maskedAreaOnly } })}>
            <span className={panelLabelClass()}>Frame</span>
            <span className="min-w-0 flex-1 text-right text-white">{settings.inpaint.maskedAreaOnly ? "Mask crop" : "Full layer"}</span>
          </button>
          <div className="grid grid-cols-2 gap-2">
            <PanelNumber label="Pad" aria-label="Inpaint crop padding" value={settings.inpaint.cropPadding} onValueChange={(cropPadding) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, cropPadding } })} />
            <PanelNumber label="Grow" aria-label="Inpaint backend grow mask" value={settings.inpaint.growMaskBy} onValueChange={(growMaskBy) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, growMaskBy } })} />
            <PanelNumber label="Expand" aria-label="Inpaint mask expand" value={settings.inpaint.maskExpand} onValueChange={(maskExpand) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskExpand } })} />
            <PanelNumber label="Feather" aria-label="Inpaint mask feather" value={settings.inpaint.maskFeather} onValueChange={(maskFeather) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskFeather } })} />
            <PanelNumber label="Blur" aria-label="Inpaint mask blur" value={settings.inpaint.maskBlur} onValueChange={(maskBlur) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskBlur } })} />
            <PanelNumber label="Clean" aria-label="Inpaint mask despeckle" value={settings.inpaint.maskDespeckle} onValueChange={(maskDespeckle) => dispatch(commandIds.toolSetGenerateSettings, { inpaint: { ...settings.inpaint, maskDespeckle } })} />
          </div>
        </div>
      </section> : null}
    </div>
  );
}

const intentOptions: ReadonlyArray<{ value: GenerateIntent; mode: GenerateMode; label: string; description: string }> = [
  { value: "create", mode: "text-to-image", label: "Create", description: "Make a new image from your prompt." },
  { value: "replace", mode: "inpaint", label: "Replace", description: "Regenerate the masked part of one layer." },
  { value: "extend", mode: "outpaint", label: "Extend", description: "Grow one selected image beyond its edges." },
  { value: "variations", mode: "image-to-image", label: "Variations", description: "Explore alternatives based on one image." },
];

function SectionTitle({ title }: { title: string }) {
  return <div className="px-1 text-xs font-semibold uppercase tracking-[0.18em] text-white/35">{title}</div>;
}

function panelSectionClass() {
  return "grid gap-2 border-b border-white/[0.07] px-0.5 pb-3 last:border-b-0 last:pb-0";
}

function sectionToggleClass() {
  return "flex w-full items-center justify-between gap-2 rounded-md px-1 py-0.5 text-left transition hover:bg-white/[0.04] focus:outline-none focus-visible:ring-2 focus-visible:ring-sky-300/50";
}

function PanelSelect<TValue extends string>({ label, value, options, ariaLabel, onValueChange }: { label: string; value: TValue; options: readonly BottomControlSelectOption<TValue>[]; ariaLabel: string; onValueChange: (value: TValue) => void }) {
  return (
    <div className="p-0.5">
      <BottomControlSelectMenu label={label} value={value} options={options} aria-label={ariaLabel} placement="inline" onValueChange={onValueChange} />
    </div>
  );
}

function PanelNumber({ label, value, onValueChange, ...props }: { label: string; "aria-label": string; value: number; onValueChange: (value: number) => void }) {
  return (
    <label className={panelRowClass()}>
      <span className={panelLabelClass()}>{label}</span>
      <NumberInput {...props} value={value} onValueChange={onValueChange} />
    </label>
  );
}

function SizeControl({ refRoot, open, setOpen, settings, dispatch }: { refRoot: RefObject<HTMLDivElement | null>; open: boolean; setOpen: (open: boolean) => void; settings: GenerateSettings; dispatch: AppStore["dispatch"] }) {
  return (
    <div ref={refRoot} className="relative">
      <button type="button" className={compactRowButtonClass()} aria-label={`Generate size ${settings.width} by ${settings.height}`} aria-expanded={open} onClick={() => setOpen(!open)}>
        <span className={panelLabelClass()}>Size</span>
        <span className="min-w-0 flex-1 text-right text-white">{settings.width} × {settings.height}</span>
        <CaretDown size={16} weight="bold" />
      </button>
      {open ? (
        <div className="app-surface absolute right-0 top-full z-30 mt-1.5 grid w-full gap-2 rounded-lg p-2.5 text-white shadow-2xl">
          <div className="grid grid-cols-2 gap-2">
            <PanelNumber label="W" aria-label="Generate width" value={settings.width} onValueChange={(width) => dispatch(commandIds.toolSetGenerateSettings, { width })} />
            <PanelNumber label="H" aria-label="Generate height" value={settings.height} onValueChange={(height) => dispatch(commandIds.toolSetGenerateSettings, { height })} />
          </div>
          <div className="grid grid-cols-5 gap-2">
            {sizePresets.map((preset) => (
              <button key={preset.label} type="button" className="rounded-md bg-white/[0.04] px-2 py-1.5 text-xs text-white/65 transition hover:bg-white/[0.08] hover:text-white focus:outline-none focus-visible:ring-2 focus-visible:ring-sky-300/50" onClick={() => dispatch(commandIds.toolSetGenerateSettings, { width: preset.w, height: preset.h })}>
                {preset.label}
              </button>
            ))}
          </div>
        </div>
      ) : null}
    </div>
  );
}

function NumberInput({ value, onValueChange, ...props }: { "aria-label": string; value: number; onValueChange: (value: number) => void }) {
  const [draft, setDraft] = useState(String(Math.round(value)));
  useEffect(() => setDraft(String(Math.round(value))), [value]);
  const commit = () => {
    const next = Number(draft.trim());
    if (draft.trim() !== "" && Number.isFinite(next)) onValueChange(next);
    else setDraft(String(Math.round(value)));
  };
  return <input {...props} type="text" inputMode="numeric" value={draft} className="h-7 w-12 rounded bg-transparent px-1.5 text-right font-mono text-xs text-white/90 outline-none transition hover:bg-white/[0.04] focus:bg-white/[0.06] focus:ring-1 focus:ring-sky-300/50" onFocus={(event) => event.currentTarget.select()} onChange={(event) => setDraft(event.currentTarget.value)} onBlur={commit} onKeyDown={(event) => { event.stopPropagation(); if (event.key === "Enter") event.currentTarget.blur(); if (event.key === "Escape") { setDraft(String(Math.round(value))); event.currentTarget.blur(); } }} />;
}

function panelRowClass() {
  return "flex min-h-9 items-center justify-between gap-2 border-b border-white/[0.045] px-1 last:border-b-0";
}

function compactRowButtonClass() {
  return `${panelRowClass()} w-full text-left transition hover:bg-white/[0.07] focus:outline-none focus-visible:ring-2 focus-visible:ring-white/30`;
}

function panelLabelClass() {
  return "shrink-0 text-sm font-medium text-white/55";
}

function panelTextAreaClass(extra = "") {
  return `${extra} resize-none rounded-lg border border-white/[0.05] bg-white/[0.035] px-3 py-2 text-xs text-white outline-none transition placeholder:text-white/25 focus:bg-white/[0.06] focus:ring-1 focus:ring-sky-300/50`;
}