import { set, delete as del } from 'vue'
import {
  rgb2hex,
  hex2rgb,
  getContrastRatioLayers
} from '../../services/color_convert/color_convert.js'
import {
  generateColors,
  generateShadows,
  generateRadii,
  generateFonts,
  composePreset,
  getThemes
} from '../../services/style_setter/style_setter.js'
import {
  CURRENT_VERSION,
  SLOT_INHERITANCE,
  OPACITIES,
  getLayers,
  getOpacitySlot
} from '../../services/theme_data/theme_data.service.js'
import ColorInput from '../color_input/color_input.vue'
import RangeInput from '../range_input/range_input.vue'
import OpacityInput from '../opacity_input/opacity_input.vue'
import ShadowControl from '../shadow_control/shadow_control.vue'
import FontControl from '../font_control/font_control.vue'
import ContrastRatio from '../contrast_ratio/contrast_ratio.vue'
import TabSwitcher from '../tab_switcher/tab_switcher.js'
import Preview from './preview.vue'
import ExportImport from '../export_import/export_import.vue'
import Checkbox from '../checkbox/checkbox.vue'

// List of color values used in v1
const v1OnlyNames = [
  'bg',
  'fg',
  'text',
  'link',
  'cRed',
  'cGreen',
  'cBlue',
  'cOrange'
].map(_ => _ + 'ColorLocal')

const colorConvert = (color) => {
  if (color.startsWith('--') || color === 'transparent') {
    return color
  } else {
    return hex2rgb(color)
  }
}

export default {
  data () {
    return {
      availableStyles: [],
      selected: this.$store.getters.mergedConfig.theme,

      previewShadows: {},
      previewColors: {},
      previewRadii: {},
      previewFonts: {},

      shadowsInvalid: true,
      colorsInvalid: true,
      radiiInvalid: true,

      keepColor: false,
      keepShadows: false,
      keepOpacity: false,
      keepRoundness: false,
      keepFonts: false,

      ...Object.keys(SLOT_INHERITANCE)
        .map(key => [key, ''])
        .reduce((acc, [key, val]) => ({ ...acc, [ key + 'ColorLocal' ]: val }), {}),

      ...Object.keys(OPACITIES)
        .map(key => console.log(key) || [key, ''])
        .reduce((acc, [key, val]) => ({ ...acc, [ key + 'OpacityLocal' ]: val }), {}),

      shadowSelected: undefined,
      shadowsLocal: {},
      fontsLocal: {},

      btnRadiusLocal: '',
      inputRadiusLocal: '',
      checkboxRadiusLocal: '',
      panelRadiusLocal: '',
      avatarRadiusLocal: '',
      avatarAltRadiusLocal: '',
      attachmentRadiusLocal: '',
      tooltipRadiusLocal: ''
    }
  },
  created () {
    const self = this

    getThemes().then((themesComplete) => {
      self.availableStyles = themesComplete
    })
  },
  mounted () {
    this.normalizeLocalState(this.$store.getters.mergedConfig.customTheme)
    if (typeof this.shadowSelected === 'undefined') {
      this.shadowSelected = this.shadowsAvailable[0]
    }
  },
  computed: {
    selectedVersion () {
      return Array.isArray(this.selected) ? 1 : 2
    },
    currentColors () {
      return Object.keys(SLOT_INHERITANCE)
        .map(key => [key, this[key + 'ColorLocal']])
        .reduce((acc, [key, val]) => ({ ...acc, [ key ]: val }), {})
    },
    currentOpacity () {
      return Object.keys(OPACITIES)
        .map(key => console.log(key) || [key, this[key + 'OpacityLocal']])
        .reduce((acc, [key, val]) => ({ ...acc, [ key ]: val }), {})
    },
    currentRadii () {
      return {
        btn: this.btnRadiusLocal,
        input: this.inputRadiusLocal,
        checkbox: this.checkboxRadiusLocal,
        panel: this.panelRadiusLocal,
        avatar: this.avatarRadiusLocal,
        avatarAlt: this.avatarAltRadiusLocal,
        tooltip: this.tooltipRadiusLocal,
        attachment: this.attachmentRadiusLocal
      }
    },
    preview () {
      return composePreset(this.previewColors, this.previewRadii, this.previewShadows, this.previewFonts)
    },
    previewTheme () {
      if (!this.preview.theme.colors) return { colors: {}, opacity: {}, radii: {}, shadows: {}, fonts: {} }
      return this.preview.theme
    },
    // This needs optimization maybe
    previewContrast () {
      if (!this.previewTheme.colors.bg) return {}
      const colors = this.previewTheme.colors
      const opacity = this.previewTheme.opacity
      if (!colors.bg) return {}
      const hints = (ratio) => ({
        text: ratio.toPrecision(3) + ':1',
        // AA level, AAA level
        aa: ratio >= 4.5,
        aaa: ratio >= 7,
        // same but for 18pt+ texts
        laa: ratio >= 3,
        laaa: ratio >= 4.5
      })
      const colorsConverted = Object.entries(colors).reduce((acc, [key, value]) => ({ ...acc, [key]: colorConvert(value) }), {})

      const ratios = Object.entries(SLOT_INHERITANCE).reduce((acc, [key, value]) => {
        const slotIsBaseText = key === 'text' || key === 'link'
        const slotIsText = slotIsBaseText || (
          typeof value === 'object' && value !== null && value.textColor
        )
        if (!slotIsText) return acc
        const { layer, variant } = slotIsBaseText ? { layer: 'bg' } : value
        const background = variant || layer
        const opacitySlot = getOpacitySlot(SLOT_INHERITANCE[background])
        const textColors = [
          key,
          ...(background === 'bg' ? ['cRed', 'cGreen', 'cBlue', 'cOrange'] : [])
        ]

        const layers = getLayers(
          layer,
          variant || layer,
          opacitySlot,
          colorsConverted,
          opacity
        )

        return {
          ...acc,
          ...textColors.reduce((acc, textColorKey) => {
            const newKey = slotIsBaseText
              ? 'bg' + textColorKey[0].toUpperCase() + textColorKey.slice(1)
              : textColorKey
            return {
              ...acc,
              [newKey]: getContrastRatioLayers(
                colorsConverted[textColorKey],
                layers,
                colorsConverted[textColorKey]
              )
            }
          }, {})
        }
      }, {})

      return Object.entries(ratios).reduce((acc, [k, v]) => { acc[k] = hints(v); return acc }, {})
    },
    previewRules () {
      if (!this.preview.rules) return ''
      return [
        ...Object.values(this.preview.rules),
        'color: var(--text)',
        'font-family: var(--interfaceFont, sans-serif)'
      ].join(';')
    },
    shadowsAvailable () {
      return Object.keys(this.previewTheme.shadows).sort()
    },
    currentShadowOverriden: {
      get () {
        return !!this.currentShadow
      },
      set (val) {
        if (val) {
          set(this.shadowsLocal, this.shadowSelected, this.currentShadowFallback.map(_ => Object.assign({}, _)))
        } else {
          del(this.shadowsLocal, this.shadowSelected)
        }
      }
    },
    currentShadowFallback () {
      return this.previewTheme.shadows[this.shadowSelected]
    },
    currentShadow: {
      get () {
        return this.shadowsLocal[this.shadowSelected]
      },
      set (v) {
        set(this.shadowsLocal, this.shadowSelected, v)
      }
    },
    themeValid () {
      return !this.shadowsInvalid && !this.colorsInvalid && !this.radiiInvalid
    },
    exportedTheme () {
      const saveEverything = (
        !this.keepFonts &&
        !this.keepShadows &&
        !this.keepOpacity &&
        !this.keepRoundness &&
        !this.keepColor
      )

      const source = {
        themeEngineVersion: CURRENT_VERSION
      }

      if (this.keepFonts || saveEverything) {
        source.fonts = this.fontsLocal
      }
      if (this.keepShadows || saveEverything) {
        source.shadows = this.shadowsLocal
      }
      if (this.keepOpacity || saveEverything) {
        source.opacity = this.currentOpacity
      }
      if (this.keepColor || saveEverything) {
        source.colors = this.currentColors
      }
      if (this.keepRoundness || saveEverything) {
        source.radii = this.currentRadii
      }

      const theme = this.previewTheme

      return {
        // To separate from other random JSON files and possible future source formats
        _pleroma_theme_version: 2, theme, source
      }
    }
  },
  components: {
    ColorInput,
    OpacityInput,
    RangeInput,
    ContrastRatio,
    ShadowControl,
    FontControl,
    TabSwitcher,
    Preview,
    ExportImport,
    Checkbox
  },
  methods: {
    setCustomTheme () {
      this.$store.dispatch('setOption', {
        name: 'customTheme',
        value: {
          shadows: this.shadowsLocal,
          fonts: this.fontsLocal,
          opacity: this.currentOpacity,
          colors: this.currentColors,
          radii: this.currentRadii
        }
      })
    },
    onImport (parsed) {
      if (parsed._pleroma_theme_version === 1) {
        this.normalizeLocalState(parsed, 1)
      } else if (parsed._pleroma_theme_version >= 2) {
        this.normalizeLocalState(parsed.theme, 2, parsed.source)
      }
    },
    importValidator (parsed) {
      const version = parsed._pleroma_theme_version
      return version >= 1 || version <= 2
    },
    clearAll () {
      const state = this.$store.getters.mergedConfig.customTheme
      const version = state.colors ? 2 : 'l1'
      this.normalizeLocalState(this.$store.getters.mergedConfig.customTheme, version, this.$store.getters.mergedConfig.customThemeSource)
    },

    // Clears all the extra stuff when loading V1 theme
    clearV1 () {
      Object.keys(this.$data)
        .filter(_ => _.endsWith('ColorLocal') || _.endsWith('OpacityLocal'))
        .filter(_ => !v1OnlyNames.includes(_))
        .forEach(key => {
          set(this.$data, key, undefined)
        })
    },

    clearRoundness () {
      Object.keys(this.$data)
        .filter(_ => _.endsWith('RadiusLocal'))
        .forEach(key => {
          set(this.$data, key, undefined)
        })
    },

    clearOpacity () {
      Object.keys(this.$data)
        .filter(_ => _.endsWith('OpacityLocal'))
        .forEach(key => {
          set(this.$data, key, undefined)
        })
    },

    clearShadows () {
      this.shadowsLocal = {}
    },

    clearFonts () {
      this.fontsLocal = {}
    },

    /**
     * This applies stored theme data onto form. Supports three versions of data:
     * v3 (version >= 3) - newest version of themes which supports snapshots for better compatiblity
     * v2 (version = 2) - newer version of themes.
     * v1 (version = 1) - older version of themes (import from file)
     * v1l (version = l1) - older version of theme (load from local storage)
     * v1 and v1l differ because of way themes were stored/exported.
     * @param {Object} theme - theme data (snapshot)
     * @param {Number} version - version of data. 0 means try to guess based on data. "l1" means v1, locastorage type
     * @param {Object} source - theme source - this will be used if compatible
     * @param {Boolean} source - by default source won't be used if version doesn't match since it might render differently
     *                           this allows importing source anyway
     */
    normalizeLocalState (theme, version = 0, source, forceSource = false) {
      let input
      if (typeof source !== 'undefined') {
        if (forceSource || source.themeEngineVersion === CURRENT_VERSION) {
          input = source
          version = source.themeEngineVersion
        } else {
          input = theme
        }
      } else {
        input = theme
      }

      const radii = input.radii || input
      const opacity = input.opacity
      const shadows = input.shadows || {}
      const fonts = input.fonts || {}
      const colors = input.colors || input

      if (version === 0) {
        if (input.version) version = input.version
        // Old v1 naming: fg is text, btn is foreground
        if (typeof colors.text === 'undefined' && typeof colors.fg !== 'undefined') {
          version = 1
        }
        // New v2 naming: text is text, fg is foreground
        if (typeof colors.text !== 'undefined' && typeof colors.fg !== 'undefined') {
          version = 2
        }
      }

      // Stuff that differs between V1 and V2
      if (version === 1) {
        this.fgColorLocal = rgb2hex(colors.btn)
        this.textColorLocal = rgb2hex(colors.fg)
      }

      if (!this.keepColor) {
        this.clearV1()
        const keys = new Set(version !== 1 ? Object.keys(colors) : [])
        if (version === 1 || version === 'l1') {
          keys
            .add('bg')
            .add('link')
            .add('cRed')
            .add('cBlue')
            .add('cGreen')
            .add('cOrange')
        }

        keys.forEach(key => {
          const color = colors[key]
          const hex = rgb2hex(colors[key])
          this[key + 'ColorLocal'] = hex === '#aN' ? color : hex
        })
      }

      if (!this.keepRoundness) {
        this.clearRoundness()
        Object.entries(radii).forEach(([k, v]) => {
          // 'Radius' is kept mostly for v1->v2 localstorage transition
          const key = k.endsWith('Radius') ? k.split('Radius')[0] : k
          this[key + 'RadiusLocal'] = v
        })
      }

      if (!this.keepShadows) {
        this.clearShadows()
        this.shadowsLocal = shadows
        this.shadowSelected = this.shadowsAvailable[0]
      }

      if (!this.keepFonts) {
        this.clearFonts()
        this.fontsLocal = fonts
      }

      if (opacity && !this.keepOpacity) {
        this.clearOpacity()
        Object.entries(opacity).forEach(([k, v]) => {
          if (typeof v === 'undefined' || v === null || Number.isNaN(v)) return
          this[k + 'OpacityLocal'] = v
        })
      }
    }
  },
  watch: {
    currentRadii () {
      try {
        this.previewRadii = generateRadii({ radii: this.currentRadii })
        this.radiiInvalid = false
      } catch (e) {
        this.radiiInvalid = true
        console.warn(e)
      }
    },
    shadowsLocal: {
      handler () {
        try {
          this.previewShadows = generateShadows({ shadows: this.shadowsLocal })
          this.shadowsInvalid = false
        } catch (e) {
          this.shadowsInvalid = true
          console.warn(e)
        }
      },
      deep: true
    },
    fontsLocal: {
      handler () {
        try {
          this.previewFonts = generateFonts({ fonts: this.fontsLocal })
          this.fontsInvalid = false
        } catch (e) {
          this.fontsInvalid = true
          console.warn(e)
        }
      },
      deep: true
    },
    currentColors () {
      try {
        this.previewColors = generateColors({
          opacity: this.currentOpacity,
          colors: this.currentColors
        })
        this.colorsInvalid = false
      } catch (e) {
        this.colorsInvalid = true
        console.warn(e)
      }
    },
    currentOpacity () {
      try {
        this.previewColors = generateColors({
          opacity: this.currentOpacity,
          colors: this.currentColors
        })
      } catch (e) {
        console.warn(e)
      }
    },
    selected () {
      if (this.selectedVersion === 1) {
        if (!this.keepRoundness) {
          this.clearRoundness()
        }

        if (!this.keepShadows) {
          this.clearShadows()
        }

        if (!this.keepOpacity) {
          this.clearOpacity()
        }

        if (!this.keepColor) {
          this.clearV1()

          this.bgColorLocal = this.selected[1]
          this.fgColorLocal = this.selected[2]
          this.textColorLocal = this.selected[3]
          this.linkColorLocal = this.selected[4]
          this.cRedColorLocal = this.selected[5]
          this.cGreenColorLocal = this.selected[6]
          this.cBlueColorLocal = this.selected[7]
          this.cOrangeColorLocal = this.selected[8]
        }
      } else if (this.selectedVersion >= 2) {
        this.normalizeLocalState(this.selected.theme, 2, this.selected.source)
      }
    }
  }
}