import { type MapScene } from './mapRenderer'
import { type ControlPointStyleEntry, type CourseLegStyleEntry, type ScoreBandStyleEntry } from '../../game/presentation/courseStyleConfig'

export type RgbaColor = [number, number, number, number]

export interface ResolvedControlStyle {
  entry: ControlPointStyleEntry
  color: RgbaColor
}

export interface ResolvedLegStyle {
  entry: CourseLegStyleEntry
  color: RgbaColor
}

export function hexToRgbaColor(hex: string, alphaOverride?: number): RgbaColor {
  const fallback: RgbaColor = [1, 1, 1, alphaOverride !== undefined ? alphaOverride : 1]
  if (typeof hex !== 'string' || !hex || hex.charAt(0) !== '#') {
    return fallback
  }

  const normalized = hex.slice(1)
  if (normalized.length !== 6 && normalized.length !== 8) {
    return fallback
  }

  const red = parseInt(normalized.slice(0, 2), 16)
  const green = parseInt(normalized.slice(2, 4), 16)
  const blue = parseInt(normalized.slice(4, 6), 16)
  const alpha = normalized.length === 8 ? parseInt(normalized.slice(6, 8), 16) : 255
  if (!Number.isFinite(red) || !Number.isFinite(green) || !Number.isFinite(blue) || !Number.isFinite(alpha)) {
    return fallback
  }

  return [
    red / 255,
    green / 255,
    blue / 255,
    alphaOverride !== undefined ? alphaOverride : alpha / 255,
  ]
}

function resolveScoreBandStyle(scene: MapScene, sequence: number): ScoreBandStyleEntry | null {
  const score = scene.controlScoresBySequence[sequence]
  if (score === undefined) {
    return null
  }

  const bands = scene.courseStyleConfig.scoreO.controls.scoreBands
  for (let index = 0; index < bands.length; index += 1) {
    const band = bands[index]
    if (score >= band.min && score <= band.max) {
      return band
    }
  }

  return null
}

export function resolveControlStyle(scene: MapScene, kind: 'start' | 'control' | 'finish', sequence: number | null, index?: number): ResolvedControlStyle {
  if (kind === 'start') {
    if (index !== undefined && scene.startStyleOverrides[index]) {
      const entry = scene.startStyleOverrides[index]
      return { entry, color: hexToRgbaColor(entry.colorHex) }
    }
    const entry = scene.gameMode === 'score-o'
      ? scene.courseStyleConfig.scoreO.controls.start
      : scene.courseStyleConfig.sequential.controls.start
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (kind === 'finish') {
    if (index !== undefined && scene.finishStyleOverrides[index]) {
      const entry = scene.finishStyleOverrides[index]
      return { entry, color: hexToRgbaColor(entry.colorHex) }
    }
    const entry = scene.gameMode === 'score-o'
      ? scene.courseStyleConfig.scoreO.controls.finish
      : scene.courseStyleConfig.sequential.controls.finish
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (sequence === null) {
    const entry = scene.courseStyleConfig.sequential.controls.default
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.controlStyleOverridesBySequence[sequence]) {
    const entry = scene.controlStyleOverridesBySequence[sequence]
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.gameMode === 'score-o') {
    if (scene.completedControlSequences.includes(sequence)) {
      const entry = scene.courseStyleConfig.scoreO.controls.collected
      return { entry, color: hexToRgbaColor(entry.colorHex) }
    }

    if (scene.focusedControlSequences.includes(sequence)) {
      const entry = scene.courseStyleConfig.scoreO.controls.focused
      return { entry, color: hexToRgbaColor(entry.colorHex) }
    }

    const bandEntry = resolveScoreBandStyle(scene, sequence)
    const entry = bandEntry || scene.courseStyleConfig.scoreO.controls.default
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.readyControlSequences.includes(sequence) || scene.activeControlSequences.includes(sequence)) {
    const entry = scene.courseStyleConfig.sequential.controls.current
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.completedControlSequences.includes(sequence)) {
    const entry = scene.courseStyleConfig.sequential.controls.completed
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.skippedControlSequences.includes(sequence)) {
    const entry = scene.courseStyleConfig.sequential.controls.skipped
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  const entry = scene.courseStyleConfig.sequential.controls.default
  return { entry, color: hexToRgbaColor(entry.colorHex) }
}

export function resolveLegStyle(scene: MapScene, index: number): ResolvedLegStyle {
  if (scene.legStyleOverridesByIndex[index]) {
    const entry = scene.legStyleOverridesByIndex[index]
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  if (scene.gameMode === 'score-o') {
    const entry = scene.courseStyleConfig.sequential.legs.default
    return { entry, color: hexToRgbaColor(entry.colorHex) }
  }

  const completed = scene.completedLegIndices.includes(index)
  const entry = completed ? scene.courseStyleConfig.sequential.legs.completed : scene.courseStyleConfig.sequential.legs.default
  return { entry, color: hexToRgbaColor(entry.colorHex) }
}