/**
 * Theme Registry for Navi
 *
 * Provides a centralized registry for map themes, supporting both built-in
 * protomaps themes (light/dark) and custom themes with full flavor objects.
 *
 * Theme config structure:
 *   id: string        - unique identifier (used in store, data-theme attr)
 *   name: string      - display name for UI
 *   dark: boolean     - true if dark theme (affects overlay styling, sprite fallback)
 *   colors: object|null - null for built-in themes, full flavor object for custom
 *   satellite: object|null - raster adjustments when satellite layer is present
 *   overlay: object   - overlay layer styling configuration
 */

import { namedTheme } from 'protomaps-themes-base'

// ═══════════════════════════════════════════════════════════════════════════
// OVERLAY CONFIGURATIONS
// ═══════════════════════════════════════════════════════════════════════════

/**
 * Dark theme overlay configuration
 * All hardcoded values from overlay add functions extracted here
 */
const darkOverlay = {
  // ── Hillshade ─────────────────────────────────────────────────────────────
  hillshade: {
    exaggeration: 0.5,
    illuminationDirection: 315,
    shadowColor: '#000000',
    highlightColor: '#ffffff',
  },

  // ── Traffic ───────────────────────────────────────────────────────────────
  traffic: {
    opacity: 0.6,
  },

  // ── Contours (main, brown/tan scheme) ─────────────────────────────────────
  contours: {
    opacityMod: 0.8,
    minorColor: '#8b6f47',
    minorOpacity: 0.4,
    minorWidth: { z11: 0.5, z14: 1.0 },
    intermediateColor: '#8b6f47',
    intermediateOpacity: 0.7,
    intermediateWidth: { z8: 0.8, z14: 1.2 },
    indexColor: '#6b4f2a',
    indexOpacity: 0.9,
    indexWidth: { z4: 1.2, z14: 1.8 },
    labelColor: '#c0b898',
    labelHaloColor: '#1a1a1a',
    labelHaloWidth: 1.5,
    labelOpacity: 0.85,
    labelSize: 10,
    labelFont: ['Noto Sans Regular'],
  },

  // ── Contours Test (blue scheme) ───────────────────────────────────────────
  // Missing keys cascade from contours
  contoursTest: {
    minorColor: '#4a7c9b',
    intermediateColor: '#4a7c9b',
    indexColor: '#2a5a7c',
    labelColor: '#98b8d0',
  },

  // ── Contours Test 10ft (green scheme) ─────────────────────────────────────
  // Missing keys cascade from contours
  contoursTest10ft: {
    minorColor: '#3a7c4f',
    intermediateColor: '#3a7c4f',
    indexColor: '#2a5c3a',
    labelColor: '#98c0a8',
  },

  // ── Public Lands (PAD-US) ─────────────────────────────────────────────────
  publicLands: {
    opacityMod: 0.7,
    // Fill colors per category
    fillWA: '#7c6b2f',
    fillNPS: '#3d6b1f',
    fillUSFS: '#5a7c2f',
    fillBLM: '#c4a672',
    fillFWS: '#4a7a5a',
    fillSTAT: '#5a8c7c',
    fillLOC: '#8ca694',
    fillDefault: '#a0a0a0',
    // Fill base opacities (multiplied by opacityMod)
    fillOpacityWA: 0.30,
    fillOpacityNPS: 0.30,
    fillOpacityUSFS: 0.25,
    fillOpacityBLM: 0.20,
    fillOpacitySTAT: 0.25,
    fillOpacityLOC: 0.20,
    fillOpacityDefault: 0.15,
    // Outline colors per category
    outlineWA: '#5a4d20',
    outlineNPS: '#2a4a15',
    outlineUSFS: '#3d5520',
    outlineBLM: '#8a7343',
    outlineFWS: '#2d5a3a',
    outlineSTAT: '#3d6055',
    outlineLOC: '#5c6e66',
    outlineDefault: '#707070',
    // Outline opacities
    outlineOpacityNPS: 0.7,
    outlineOpacityUSFS: 0.6,
    outlineOpacityDefault: 0.5,
    // Outline width
    outlineWidth: { z4: 0.3, z8: 0.8, z12: 1.2 },
    // Labels
    labelColor: '#c0c8b8',
    labelHaloColor: '#1a1a1a',
    labelHaloWidth: 1.5,
    labelOpacity: 0.85,
    labelSize: { z10: 10, z14: 13 },
    labelFont: ['Noto Sans Regular'],
  },

  // ── USFS Trails ───────────────────────────────────────────────────────────
  usfsTrails: {
    // Roads
    roadsColor: '#d0a060',
    roadsOpacity: 0.9,
    roadsWidth: { z10: 1.5, z14: 2.5, z16: 3.5 },
    // Trails colors by use type
    trailsMotorized: '#f08040',
    trailsBicycle: '#e0b040',
    trailsHiker: '#60c050',
    trailsDefault: '#c0a060',
    trailsOpacity: 0.9,
    trailsWidth: { z10: 2.0, z14: 3.0, z16: 4.0 },
    trailsDash: [2, 1.5],
    // Road labels
    roadsLabelColor: '#d0c0a0',
    roadsLabelHaloColor: '#1a1a1a',
    roadsLabelHaloWidth: 1.5,
    roadsLabelOpacity: 0.9,
    roadsLabelSize: 11,
    // Trail labels
    trailsLabelColor: '#d0b090',
    trailsLabelHaloColor: '#1a1a1a',
    trailsLabelHaloWidth: 1.5,
    trailsLabelOpacity: 0.9,
    trailsLabelSize: 11,
    labelFont: ['Noto Sans Regular'],
    // Hit layer
    hitWidth: 14,
  },

  // ── BLM Trails / Roads ────────────────────────────────────────────────────
  blmTrails: {
    // Route colors by use class
    color4wdHigh: '#f08040',
    color4wdLow: '#e0b040',
    colorAtv: '#e04040',
    colorMotoSingle: '#b070c0',
    color2wdLow: '#f0d070',
    colorNonMech: '#60c050',
    colorDefault: '#c0a060',
    colorSnow: '#80b0e0',
    lineOpacity: 0.9,
    lineOpacityOther: 0.85,
    lineWidth: { z10: 2.0, z14: 3.0, z16: 4.0 },
    // Dash patterns by surface type
    dashImproved: [4, 2],
    dashAggregate: [1, 2],
    dashSnow: [4, 2, 1, 2],
    dashOther: [4, 2, 1, 2, 1, 2],
    // Labels
    labelColor: '#d0c0a0',
    labelHaloColor: '#1a1a1a',
    labelHaloWidth: 1.5,
    labelOpacity: 0.9,
    labelSize: 11,
    labelFont: ['Noto Sans Regular'],
    // Hit layer
    hitWidth: 14,
  },
}

/**
 * Light theme overlay configuration
 * All hardcoded values from overlay add functions extracted here
 */
const lightOverlay = {
  // ── Hillshade ─────────────────────────────────────────────────────────────
  hillshade: {
    exaggeration: 0.5,
    illuminationDirection: 315,
    shadowColor: '#000000',
    highlightColor: '#ffffff',
  },

  // ── Traffic ───────────────────────────────────────────────────────────────
  traffic: {
    opacity: 0.6,
  },

  // ── Contours (main, brown/tan scheme) ─────────────────────────────────────
  contours: {
    opacityMod: 1.0,
    minorColor: '#8b6f47',
    minorOpacity: 0.4,
    minorWidth: { z11: 0.5, z14: 1.0 },
    intermediateColor: '#8b6f47',
    intermediateOpacity: 0.7,
    intermediateWidth: { z8: 0.8, z14: 1.2 },
    indexColor: '#6b4f2a',
    indexOpacity: 0.9,
    indexWidth: { z4: 1.2, z14: 1.8 },
    labelColor: '#5a4020',
    labelHaloColor: '#ffffff',
    labelHaloWidth: 1.5,
    labelOpacity: 0.85,
    labelSize: 10,
    labelFont: ['Noto Sans Regular'],
  },

  // ── Contours Test (blue scheme) ───────────────────────────────────────────
  // Missing keys cascade from contours
  contoursTest: {
    minorColor: '#4a7c9b',
    intermediateColor: '#4a7c9b',
    indexColor: '#2a5a7c',
    labelColor: '#205080',
  },

  // ── Contours Test 10ft (green scheme) ─────────────────────────────────────
  // Missing keys cascade from contours
  contoursTest10ft: {
    minorColor: '#3a7c4f',
    intermediateColor: '#3a7c4f',
    indexColor: '#2a5c3a',
    labelColor: '#2a4030',
  },

  // ── Public Lands (PAD-US) ─────────────────────────────────────────────────
  publicLands: {
    opacityMod: 1.0,
    // Fill colors per category
    fillWA: '#7c6b2f',
    fillNPS: '#3d6b1f',
    fillUSFS: '#5a7c2f',
    fillBLM: '#c4a672',
    fillFWS: '#4a7a5a',
    fillSTAT: '#5a8c7c',
    fillLOC: '#8ca694',
    fillDefault: '#a0a0a0',
    // Fill base opacities (multiplied by opacityMod)
    fillOpacityWA: 0.30,
    fillOpacityNPS: 0.30,
    fillOpacityUSFS: 0.25,
    fillOpacityBLM: 0.20,
    fillOpacitySTAT: 0.25,
    fillOpacityLOC: 0.20,
    fillOpacityDefault: 0.15,
    // Outline colors per category
    outlineWA: '#5a4d20',
    outlineNPS: '#2a4a15',
    outlineUSFS: '#3d5520',
    outlineBLM: '#8a7343',
    outlineFWS: '#2d5a3a',
    outlineSTAT: '#3d6055',
    outlineLOC: '#5c6e66',
    outlineDefault: '#707070',
    // Outline opacities
    outlineOpacityNPS: 0.7,
    outlineOpacityUSFS: 0.6,
    outlineOpacityDefault: 0.5,
    // Outline width
    outlineWidth: { z4: 0.3, z8: 0.8, z12: 1.2 },
    // Labels
    labelColor: '#3a4a30',
    labelHaloColor: '#ffffff',
    labelHaloWidth: 1.5,
    labelOpacity: 0.85,
    labelSize: { z10: 10, z14: 13 },
    labelFont: ['Noto Sans Regular'],
  },

  // ── USFS Trails ───────────────────────────────────────────────────────────
  usfsTrails: {
    // Roads
    roadsColor: '#c09050',
    roadsOpacity: 0.9,
    roadsWidth: { z10: 1.5, z14: 2.5, z16: 3.5 },
    // Trails colors by use type
    trailsMotorized: '#e07030',
    trailsBicycle: '#d0a030',
    trailsHiker: '#50b040',
    trailsDefault: '#b09050',
    trailsOpacity: 0.9,
    trailsWidth: { z10: 2.0, z14: 3.0, z16: 4.0 },
    trailsDash: [2, 1.5],
    // Road labels
    roadsLabelColor: '#6a5a40',
    roadsLabelHaloColor: '#ffffff',
    roadsLabelHaloWidth: 1.5,
    roadsLabelOpacity: 0.9,
    roadsLabelSize: 11,
    // Trail labels
    trailsLabelColor: '#5a4a30',
    trailsLabelHaloColor: '#ffffff',
    trailsLabelHaloWidth: 1.5,
    trailsLabelOpacity: 0.9,
    trailsLabelSize: 11,
    labelFont: ['Noto Sans Regular'],
    // Hit layer
    hitWidth: 14,
  },

  // ── BLM Trails / Roads ────────────────────────────────────────────────────
  blmTrails: {
    // Route colors by use class
    color4wdHigh: '#e07030',
    color4wdLow: '#d0a030',
    colorAtv: '#d03030',
    colorMotoSingle: '#a060b0',
    color2wdLow: '#e0c060',
    colorNonMech: '#50b040',
    colorDefault: '#b09050',
    colorSnow: '#6090c0',
    lineOpacity: 0.9,
    lineOpacityOther: 0.85,
    lineWidth: { z10: 2.0, z14: 3.0, z16: 4.0 },
    // Dash patterns by surface type
    dashImproved: [4, 2],
    dashAggregate: [1, 2],
    dashSnow: [4, 2, 1, 2],
    dashOther: [4, 2, 1, 2, 1, 2],
    // Labels
    labelColor: '#5a4a30',
    labelHaloColor: '#ffffff',
    labelHaloWidth: 1.5,
    labelOpacity: 0.9,
    labelSize: 11,
    labelFont: ['Noto Sans Regular'],
    // Hit layer
    hitWidth: 14,
  },
}

// ═══════════════════════════════════════════════════════════════════════════
// THEME REGISTRY
// ═══════════════════════════════════════════════════════════════════════════

/**
 * Theme registry - maps theme IDs to theme configurations
 *
 * Built-in themes (light/dark) use colors: null to signal that namedTheme()
 * should be called at render time. Custom themes provide a full flavor object.
 */
const themes = {
  light: {
    id: 'light',
    name: 'Light',
    dark: false,
    colors: null,  // Use namedTheme('light')
    satellite: null,
    overlay: lightOverlay,
  },
  dark: {
    id: 'dark',
    name: 'Dark',
    dark: true,
    colors: null,  // Use namedTheme('dark')
    satellite: null,
    overlay: darkOverlay,
  },
  // Custom themes go here. Example:
  // 'midnight': {
  //   id: 'midnight',
  //   name: 'Midnight',
  //   dark: true,
  //   colors: { /* full flavor object matching dark-flavor-reference.json schema */ },
  //   satellite: { opacity: 0.8, brightnessMin: 0.1 },
  //   overlay: { /* partial overrides - missing keys fall back to dark overlay */ },
  // },
}

// ═══════════════════════════════════════════════════════════════════════════
// EXPORTED FUNCTIONS
// ═══════════════════════════════════════════════════════════════════════════

/**
 * Get a theme configuration by ID
 * @param {string} id - Theme ID
 * @returns {object} Theme config, falls back to 'dark' if not found
 */
export function getTheme(id) {
  return themes[id] || themes.dark
}

/**
 * Get the color flavor for a theme
 * For built-in themes, calls namedTheme(). For custom themes, returns colors directly.
 * @param {string} id - Theme ID
 * @returns {object} Flavor object for use with protomaps layers()
 */
export function getThemeColors(id) {
  const theme = getTheme(id)
  if (theme.colors === null) {
    // Built-in theme - use namedTheme from protomaps-themes-base
    return namedTheme(id)
  }
  return theme.colors
}

/**
 * Get the sprite URL for a theme
 * Built-in themes use their own sprites. Custom themes fall back to
 * dark or light sprite based on the theme's dark flag.
 * @param {string} id - Theme ID
 * @returns {string} Full sprite URL
 */
export function getThemeSprite(id) {
  const theme = getTheme(id)
  // Custom themes don't have matching sprites on CDN - fall back based on dark flag
  const spriteTheme = theme.colors === null ? id : (theme.dark ? 'dark' : 'light')
  return `https://protomaps.github.io/basemaps-assets/sprites/v4/${spriteTheme}`
}

/**
 * Get overlay configuration for a specific layer
 *
 * For contour variants (contoursTest, contoursTest10ft), missing keys cascade
 * from the same theme's contours config.
 *
 * For custom themes, missing keys fall back to the appropriate built-in theme
 * (dark or light based on theme.dark flag).
 *
 * @param {string} themeId - Theme ID
 * @param {string} layerKey - Overlay layer key (hillshade, contours, publicLands, etc.)
 * @returns {object} Merged overlay config for the layer
 */
export function getOverlayConfig(themeId, layerKey) {
  const theme = getTheme(themeId)
  const builtinTheme = theme.dark ? themes.dark : themes.light
  const builtinOverlay = builtinTheme.overlay[layerKey] || {}

  // For contour variants, cascade from same theme's contours config
  let baseConfig = builtinOverlay
  if (layerKey === 'contoursTest' || layerKey === 'contoursTest10ft') {
    const contoursBase = builtinTheme.overlay.contours || {}
    baseConfig = { ...contoursBase, ...builtinOverlay }
  }

  // If this is a custom theme with overlay overrides, merge them
  if (theme.overlay && theme.overlay[layerKey]) {
    // For contour variants in custom themes, also cascade from custom contours
    if (layerKey === 'contoursTest' || layerKey === 'contoursTest10ft') {
      const customContours = theme.overlay.contours || {}
      return { ...baseConfig, ...customContours, ...theme.overlay[layerKey] }
    }
    return { ...baseConfig, ...theme.overlay[layerKey] }
  }

  return baseConfig
}

/**
 * Get list of available themes for UI display
 * @returns {Array<{id: string, name: string, dark: boolean}>}
 */
export function themeList() {
  return Object.values(themes).map(({ id, name, dark }) => ({ id, name, dark }))
}

/**
 * Check if a theme ID is valid/registered
 * @param {string} id - Theme ID to check
 * @returns {boolean}
 */
export function isValidTheme(id) {
  return id in themes
}

export default themes