import { hierarchy } from 'd3-hierarchy'


const dateFormatter = new Intl.DateTimeFormat('fr-FR', { month: 'long', year: 'numeric' })

export const RELATIONS = [
  'parents',
  'siblings',
  'creation_siblings',
  'children'
]

export const DATA_LEVELS = {
  initial: 0,
  partial: 1,
  full: 2
}

export const ID_VARIANTS = {
  9: 'depart',
  22: 'critique',
  63: 'echo',
  6: 'reflexion',
  7: 'lecture',
  8: 'sensible',
  23: 'kit',
  0: 'creation'
}

export const VARIANT_IDS = Object.fromEntries(
  Object.entries(ID_VARIANTS).map(([key, value]) => [value, parseInt(key)])
)

export const SEARCH_KEYS = ['content', 'title', 'preTitle', 'authors']


export function formatDate (date) {
  return dateFormatter.format(new Date(date))
}


export function parseNodesQueryParams ({ mode, nodes = [] }) {
  let nodebook = typeof nodes === 'string' ? [nodes] : nodes
  nodebook = nodebook.map(ids => {
    return typeof ids === 'string'
      ? ids.split(',').map(id => parseInt(id))
      : [...ids]
  })
  return { mode, nodebook }
}


export function reduceQueryLevels (lvl, lowestLvl = -1) {
  return Array(lvl - lowestLvl).fill(lowestLvl + 1).map((v, i) => v + i)
}


export function reduceQueryIds (ids, dataLevel, data) {
  const lvl = DATA_LEVELS[dataLevel]
  const idsToQuery = []
  let lowestLvl = lvl
  for (const id of ids) {
    const nodeLvl = id in data ? data[id].dataLevel : -1
    if (nodeLvl < lvl) {
      idsToQuery.push(id)
    }
    if (nodeLvl < lowestLvl) {
      lowestLvl = nodeLvl
    }
  }

  return idsToQuery.length === 0 ? {} : {
    idsToQuery,
    levelsToQuery: reduceQueryLevels(lvl, lowestLvl)
  }
}


export function getUniqueNodesIds (tree) {
  function extractId (ids, node) {
    ids.add(node.id)
    for (const relation of RELATIONS) {
      if (relation in node && node[relation]) {
        for (const subNode of node[relation]) {
          extractId(ids, subNode)
        }
      }
    }
    return ids
  }
  return Array.from(extractId(new Set(), tree))
}


export function getRelatedNodesIds (nodes, ignored) {
  const ids = new Set()
  for (const node of nodes) {
    for (const relation of RELATIONS) {
      if (relation in node && node[relation]) {
        node[relation].forEach(({ id }) => {
          if (ignored.includes(id)) return
          ids.add(id)
        })
      }
    }
  }
  return Array.from(ids)
}


export function getRandomIds (ids, count = 3) {
  const randomIds = []
  while (randomIds.length < count) {
    const id = ids[Math.floor(Math.random() * ids.length)]
    if (!randomIds.includes(id)) {
      randomIds.push(id)
    }
  }
  return randomIds
}


export function parseTree (treeData) {
  if ('creations' in treeData) {
    if (treeData.creations) {
      if (!Array.isArray(treeData.children)) {
        treeData.children = []
      }
      treeData.creations.forEach(item => {
        item.variant = [{ id: 0 }]
        treeData.children.push(item)
      })
    }
    delete treeData.creations
  }

  for (const relation of RELATIONS) {
    if (relation in treeData && treeData[relation]) {
      treeData[relation] = treeData[relation].map(node => parseTree(node))
    }
  }

  return treeData
}


export function buildTree (treeData, nodesData) {
  const uniqueIds = []
  const nodes = []
  const links = []
  const h = hierarchy(treeData, (node) => {
    return RELATIONS.reduce((acc, relation) => {
      if (node[relation]) {
        node[relation].forEach((item, i) => {
          item.linkType = relation
        })
        return [...acc, ...node[relation]]
      }
      return acc
    }, [])
  })

  h.each(node => {
    node.id = node.data.id
    if (!uniqueIds.includes(node.id)) {
      uniqueIds.push(node.id)
      node.data = nodesData.find(n => n.id === node.id)
      // Add `x` and `y` keys so Vue can update on these values updates
      Object.assign(node, { x: undefined, y: undefined })
      nodes.push(node)
      if (node.children) {
        node.children.forEach(child => {
          const asSource = links.find(link => link.source === node.id && link.target === child.data.id)
          const asTarget = links.find(link => link.source === child.data.id && link.target === node.id)
          if (!asSource && !asTarget) {
            links.push({ source: node.id, target: child.data.id, linkType: child.data.linkType })
          }
        })
      }
    }
  })

  return {
    nodes,
    links
  }
}


export function searchInNode (search, node) {
  if (!search) return true
  for (const key of SEARCH_KEYS) {
    if (!node[key]) continue
    let match = false
    if (key === 'authors') {
      match = node[key].some(author => author.name.toLowerCase().includes(search))
    } else {
      match = node[key].toLowerCase().includes(search)
    }
    if (match) return true
  }
  return false
}


export function tagsInNode (tags, nodeTags) {
  if (tags.length === 0) return true
  if (!nodeTags || nodeTags.length === 0) return false
  return tags.every(tag => nodeTags.some(nodeTag => nodeTag.name === tag))
}


export function getRelation (node) {
  if (node.type === 'prod' && node.parents && node.parents.length) {
    return { parentId: node.parents[0].id, childId: node.id }
  }
  return { parentId: node.id }
}


export function getStrangenessOpacity (currentStrangeness, node) {
  if (currentStrangeness === undefined) return 1
  const strangeness = (
    node.type === 'prod' && node.parents && node.parents.length ? node.parents[0] : node
  ).strangeness
  return 1 / (Math.abs(strangeness - currentStrangeness) + 1)
}