import type { Palette } from './palette';
import { UI, contrast, ensureContrast, mix, rgbTriplet } from './contrast';

// Omarchy palette → Officer's 84 declarations.
//
// This file is the whole port. It exists once so that twenty-two themes cannot disagree about what
// "muted" means, and so that improving the mapping improves all of them at once.
//
// ── What went wrong before, and what this fixes ──
//
// The previous port produced 34 declarations per theme against a contract of 84. The missing fifty were
// every surface (`--panel-bg`, `--card-bg`, `--glass-bg`), every state colour (`--success`, `--warning`,
// `--busy`, `--info`), the header, the scrollbars and the grid — so they fell back to whatever the base
// stylesheet or the previous theme left behind. That is why highlights masked content and text faded
// out: not taste, absence. It also shipped thirteen tokens nothing reads (`--chart-1..5`, `--sidebar-*`),
// which is the tell that it came from a shadcn template rather than from this codebase's contract.
//
// ── The rule that makes them readable ──
//
// Every foreground is run through `ensureContrast` against the surface it actually sits on. A palette
// whose colours are already readable is untouched; one that is not gets nudged toward black or white
// until it passes, keeping as much hue as it can. So a theme cannot ship with invisible text, no matter
// what its author chose.

export type Tokens = Record<string, string>;

/** Depth ordering differs by mode: a light theme's "darker" is its raised surface, not its page. */
function surfaces(p: Palette) {
  const dark = p.mode === 'dark';
  return {
    /** The page. The deepest surface in dark, the plainest in light. */
    page: dark ? p.darkerBackground : p.background,
    /** Panels and cards sit one step up from the page, so a tile reads as a tile. */
    raised: dark ? p.background : p.lighterBackground,
    /** Hovers, secondary fills, the header. One step up again. */
    high: dark ? p.lighterBackground : p.darkBackground,
    dark,
  };
}

export function mapPalette(p: Palette): Tokens {
  const s = surfaces(p);

  // Text, checked against the surface each weight actually appears on.
  const fg = ensureContrast(p.foreground, s.page);
  const fgRaised = ensureContrast(p.foreground, s.raised);
  // Checked against `s.high`, not `s.raised`: `--muted-foreground` is the text ON `--muted`, and
  // `--muted` is the high surface. Deriving it against the wrong one left everforest at 4.44:1 and
  // miasma at 4.00 — close enough to look fine and still fail, which is the kind of near-miss that a
  // person eyeballing a screenshot would have shipped.
  const fgMuted = ensureContrast(p.lightForeground, s.high);
  const fgFaint = ensureContrast(p.darkForeground, s.raised, UI);

  /**
   * Text for a solid fill of `bg`.
   *
   * Tries the palette's own extremes first, so a button's label still belongs to the theme, and only
   * falls through to `ensureContrast` when neither is readable. Both steps are needed: picking the
   * better of two candidates does NOT guarantee either passes — rose-pine's fills are all mid-tone and
   * every one came out between 2.2:1 and 4.2:1 until this drove it the rest of the way.
   */
  const on = (bg: string): string => {
    const light = p.brightForeground;
    const dark = p.darkerBackground;
    const better = contrast(light, bg) >= contrast(dark, bg) ? light : dark;
    return ensureContrast(better, bg);
  };

  const accent = p.accent;
  // Borders are DECORATION, not information, so they are not held to a text ratio — a 3:1 line drawn
  // around every panel is a different design, not a more accessible one. What they must be is
  // discernible, which `--input` below is checked for: a form field whose boundary you cannot see is a
  // real accessibility failure, unlike a subtle panel edge.
  const border = mix(s.raised, s.dark ? p.lightForeground : p.darkForeground, 0.28);

  return {
    // ── Ground ──
    '--background': s.page,
    '--foreground': fg,

    // ── Surfaces ──
    '--card': s.raised,
    '--card-foreground': fgRaised,
    '--popover': s.raised,
    '--popover-foreground': fgRaised,
    // `muted` is a SURFACE here, not the palette's `muted` colour — that one is a mid-grey meant for
    // dimmed text, and using it as a fill is precisely how a highlight ends up masking its content.
    '--muted': s.high,
    '--muted-foreground': fgMuted,
    '--accent': s.high,
    '--accent-foreground': fgRaised,

    // ── Actions ──
    '--primary': accent,
    '--primary-foreground': on(accent),
    '--secondary': s.high,
    '--secondary-foreground': fgRaised,
    '--cta': accent,
    '--cta-foreground': on(accent),
    '--ctahover': mix(accent, s.dark ? '#ffffff' : '#000000', 0.12),

    // ── State — five tones, each readable on its own fill ──
    '--success': p.green,
    '--success-foreground': on(p.green),
    '--warning': p.yellow,
    '--warning-foreground': on(p.yellow),
    '--destructive': p.red,
    '--destructive-foreground': on(p.red),
    '--info': p.blue,
    '--info-foreground': on(p.blue),
    '--busy': p.orange,
    '--busy-foreground': on(p.orange),
    // The odd one, per the contract: a fill bright enough for black text is too light to BE text. So ink
    // is the same hue pushed until it reads on the page.
    '--busy-ink': ensureContrast(p.orange, s.page),

    // ── Lines ──
    '--border': border,
    '--input': border,
    '--ring': accent,
    '--radius': '0.625rem',

    // ── Data ──
    '--chart-primary': accent,
    '--chart-secondary': p.magenta,
    '--status-success': p.green,
    '--status-warning': p.yellow,
    '--status-in-progress': p.blue,

    // ── Surfaces, as complete CSS values ──
    '--page-bg': s.page,
    '--page-bg-src': "''",
    '--panel-bg': `rgb(${rgbTriplet(s.raised)} / 0.72)`,
    '--panel-border': `rgb(${rgbTriplet(border)} / 0.9)`,
    '--panel-border-bare': `rgb(${rgbTriplet(border)} / 0.55)`,
    // DENSER, not darker — panel chrome is dark text and a heavy fill hides every icon. The contract
    // says so; this is the one place a value is chosen to obey a sentence rather than a ratio.
    '--panel-raised-bg': `rgb(${rgbTriplet(s.raised)} / 0.95)`,
    '--panel-raised-border': `rgb(${rgbTriplet(border)} / 1)`,
    '--panel-accent': accent,
    '--panel-header-bg': `rgb(${rgbTriplet(s.high)} / 0.6)`,
    '--panel-header-fg': fgRaised,
    '--panel-radius': '0.75rem',
    '--panel-blur': '12px',
    '--card-bg': s.raised,
    '--glass-bg': `rgb(${rgbTriplet(s.raised)} / 0.55)`,
    '--glass-border': `rgb(${rgbTriplet(border)} / 0.7)`,
    '--dock-bg': `rgb(${rgbTriplet(s.raised)} / 0.7)`,
    '--dock-border': `rgb(${rgbTriplet(border)} / 0.8)`,
    '--dock-tooltip-bg': s.high,
    '--header-bg': `rgb(${rgbTriplet(s.raised)} / 0.8)`,
    '--header-border': `rgb(${rgbTriplet(border)} / 0.9)`,
    '--header-fg': fgRaised,
    '--header-blur': '12px',

    // Grid lines are a texture, not a colour anyone should notice — kept just above the surface.
    '--pixel-grid-color': `rgb(${rgbTriplet(fgFaint)} / 0.07)`,
    '--card-grid-color': `rgb(${rgbTriplet(fgFaint)} / 0.05)`,
    '--panel-grid-color': `rgb(${rgbTriplet(fgFaint)} / 0.06)`,

    '--scrollbar-thumb': `rgb(${rgbTriplet(p.muted)} / 0.6)`,
    '--scrollbar-thumb-hover': `rgb(${rgbTriplet(p.muted)} / 0.85)`,
    '--scrollbar-thin-thumb': `rgb(${rgbTriplet(p.muted)} / 0.45)`,
    '--scrollbar-thin-thumb-hover': `rgb(${rgbTriplet(p.muted)} / 0.7)`,

    // ── Brand slots ──
    //
    // A ported theme has no brand of its own, so these follow its accent rather than importing Duck's
    // green into somebody else's palette. `--ink` is the app's text colour and is used ~950 times.
    '--brand': accent,
    '--brand-foreground': on(accent),
    '--brand-primary': accent,
    '--brand-accent': p.cyan,
    '--brand-warm': p.orange,
    '--brand-deep': s.dark ? p.darkerBackground : p.darkBackground,
    '--brand-muted': p.muted,
    '--ink': fg,
    '--surface-warm': s.raised,
    '--naturegreen': p.green,
    '--naturegreen-foreground': on(p.green),

    // Legacy aliases the contract keeps until the utility rename lands — `prose.css` and some plugins
    // read them directly, so a theme without them has unstyled prose.
    '--duck-dark': fg,
    '--duck-teal': p.cyan,
    '--duck-yellow': p.yellow,
    '--duck-orange': p.orange,
    '--duck-forest': p.green,
    '--duck-beige': mix(s.raised, fg, 0.1),

    '--logo-src': "'/officer-logo.svg'",
  };
}