const {logHeaderApi} = require("../../../../../rpdata/api/LogHeader")

module.exports = class {
  onCreate(input) {
    this.state = {
      id: input.log.id,
      channelName: input.log.channelName,
      eventName: input.log.eventName,
      nexts: [],
      prevs: [],
      loaded: false,
      error: null,
    }
  }

  onMount() {
    this.timeout = setTimeout(() => {
      logHeaderApi.list().then(logs => {
        const index = logs.findIndex(l => l.id === this.state.id);
        if (index === -1) {
          return Promise.reject("This log not found in list.")
        }
        const log = logs[index]
        const characterIds = log.characters.map(c => c.id);
        const nexts = []
        const prevs = []
        let foundGroups = {}
        let foundChannel = false

        for (let i = index - 1; i >= 0; --i) {
          const log2 = logs[i]
          const hasEvent = (log.eventName ? log.eventName === log2.eventName : false)
          const hasChannel = (log.channelName === log2.channelName)

          const characters = log2.findCharacters(...characterIds)
          const characterIdsKey = characters.map(c => c.id).sort().join(",")

          const suggestion = {log: log2, characters, hasEvent, hasChannel}

          if (hasChannel && !foundChannel) {
            foundChannel = true
            foundGroups[characterIdsKey] = true

            nexts.push(suggestion)
          } else if (hasEvent) {
            foundGroups[characterIdsKey] = true

            nexts.push(suggestion)
          } else if (nexts.length < 8 && !hasEvent && characters.length > 1 && !foundGroups[characterIdsKey]) {
            foundGroups[characterIdsKey] = true
            nexts.push(suggestion)
          }
        }

        foundGroups = {}
        foundChannel = false

        for (let i = index + 1; i < logs.length; ++i) {
          const log2 = logs[i]
          const hasEvent = (log.eventName ? log.eventName === log2.eventName : false)
          const hasChannel = (log.channelName === log2.channelName)

          const characters = log2.findCharacters(...characterIds)
          const characterIdsKey = characters.map(c => c.id).sort().join(",")

          const suggestion = {log: log2, characters, hasEvent, hasChannel}

          if (hasChannel && !foundChannel) {
            foundChannel = true
            foundGroups[characterIdsKey] = true

            prevs.push(suggestion)
          } else if (hasEvent) {
            foundGroups[characterIdsKey] = true

            prevs.push(suggestion)
          } else if (prevs.length < 8 && !hasEvent && characters.length > 1 && !foundGroups[characterIdsKey]) {
            foundGroups[characterIdsKey] = true
            prevs.push(suggestion)
          }
        }

        this.state.nexts = nexts;
        this.state.prevs = prevs;
        this.state.loaded = true;
      }).catch(err => {
        console.warn("Suggestions load error:", err)
        this.suggestionsError = "Failed to load suggestions: " + err.toString()
      })
    }, 1000)
  }

  onUnmount() {
    clearTimeout(this.timeout)
  }
}