import React, { Component } from 'react'
import { Link } from 'react-router-dom'

import Timestamp from './timestamp.js'
import { api, httpGET, httpStreamGET } from '../http.js'
import './output.css'

let Convert = require('ansi-to-html')
let converter = new Convert()

export default class Output extends Component {
    constructor(props) {
        super(props)
        this.state = { job: null, xhr: null }
    }

    componentWillReceiveProps(props) {
        if (props.jobID && props.jobID !== this.props.jobID) {
            this.loadJob(props.jobID)
        }
    }

    componentDidMount() {
        this.loadJob(this.props.jobID)
    }

    componentWillUnmount() {
        if (this.state.xhr) {
            this.state.xhr.abort()
        }
    }

    loadJob(id) {
        if (id) {
            this.refs["output"].innerHTML = ""
            this.loadJobDetails(id)
            this.loadCommandLog(id)
        }
    }

    loadJobDetails(id) {
        httpGET(api("/jobs/" + id),
            (status, body) => {
                this.setState({ job: JSON.parse(body) })
            },
            (error) => {
                console.log("Failed to load job details:", error)
            }
        )
    }

    loadCommandLog(id) {
        if (this.state.xhr) {
            this.state.xhr.abort()
        }

        let xhr = httpStreamGET(api("/jobs/" + id + "/log"),
            (chunk) => { // Progress
                let target = this.refs["output"]
                chunk = converter.toHtml(chunk)
                target.innerHTML += chunk.replace(/\n/g, "<br/>")
                this.autoScroll()
            },
            (status) => { // Complete
                // Request cancelled
                if (status === 0) {
                    return
                }

                // Reload job details
                this.setState({ xhr: null })
                this.loadJobDetails(id)
            },
            (error) => {
                let target = this.refs["output"]
                target.innerHTML = "Failed to fetch command log: " + error
            }
        )
        this.setState({ xhr: xhr })
    }

    autoScroll() {
        // TODO: Figure out how to make it convinient
    }

    render() {
        let className = this.state.job ? "output visible" : "output"
        return (
            <div>
                {this.renderJobDetails()}
                <div ref="output" className={className}></div>
            </div>
        )
    }

    renderJobDetails() {
        let details = this.state.job
        if (!details) {
            return null
        }

        // let shortID = details.id.substring(0, 8)
        var state = details.state
        state = state.charAt(0).toUpperCase() + state.substr(1)

        var args
        if (details.args !== "") {
            args = <span className="args">{details.args}</span>
        }
        return (
            <div className="job-details full">
                <div className="item command">
                    <span className="command"><Link to={"/cmd/" + details.command + "/jobs"}>{details.command}</Link></span>
                    {args}
                    <span className="flags">{details.flags}</span>
                </div>
                <div className="item id">
                    <div className="name">ID</div>
                    <div className="val"><Link to={"/cmd/" + details.command + "/jobs/" + details.id}>{details.id}</Link></div>
                </div>
                <div className="item state">
                    <div className="name">Status</div>
                    <div className={"val " + details.state}>{state}</div>
                </div>
                <div className="item user">
                    <div className="name">User</div>
                    <div className="val"><Link to={"/users/" + details.user.id + "/jobs"}>{details.user.name}</Link></div>
                </div>
                {this.renderStarted()}
                {this.renderFinished()}
            </div>
        )
    }

    renderStarted() {
        let details = this.state.job
        return (
            <div className="item started_at">
                <div className="name">Started</div>
                <div className="val"><Timestamp date={details.started_at} relative={details.finished_at === null} /></div>
            </div>
        )
    }

    renderFinished() {
        let details = this.state.job
        if (details.finished_at === null) {
            return null
        }

        return [
            <div className="item finished_at" key="finished_at">
                <div className="name">Finished</div>
                <div className="val"><Timestamp date={details.finished_at} /></div>
            </div>,
            <div className="item took" key="took">
                <div className="name">Took</div>
                <div className="val"><Timestamp from={details.started_at} until={details.finished_at} /></div>
            </div>
        ]
    }
}