import Sorter from './sorter';
import Matrices from './matrices';

const Diagram = {
    clear: () => d3.select('svg').selectAll("*").remove(),

    swapGroupArcs: (chords, i, j) => {
        if (i < 0 || j < 0 || i === j) {
            return chords;
        }

        // Determine which arc is closer to 0, so earlier arc always swaps with later.
        const f = (chords.groups[i].endAngle < chords.groups[j].endAngle ? i : j);
        const s = (chords.groups[i].endAngle < chords.groups[j].endAngle ? j : i);

        const fst = Object.assign({}, chords.groups[f]);
        const snd = Object.assign({}, chords.groups[s]);

        const fstAngle = fst.endAngle - fst.startAngle;
        const sndAngle = snd.endAngle - snd.startAngle;
        const offsetAngle = sndAngle - fstAngle;

        // Bring first forward.
        chords.groups[f].startAngle = snd.endAngle - fstAngle;
        chords.groups[f].endAngle = snd.endAngle;
        chords.groups[f].index = snd.index;

        // Bring second back.
        chords.groups[s].startAngle = fst.startAngle;
        chords.groups[s].endAngle = fst.startAngle + sndAngle;
        chords.groups[s].index = fst.index;

        // Bump other groups forward.
        for (let ii = f + 1; ii < s; ii++) {
            chords.groups[ii].startAngle += offsetAngle;
            chords.groups[ii].endAngle += offsetAngle;
        }

        chords.forEach(v => {
            if (v.source.index === f) {
                v.source.startAngle += (snd.endAngle - fst.endAngle);
                v.source.endAngle += (snd.endAngle - fst.endAngle);
            }

            if (v.target.index === f) {
                v.target.startAngle += (snd.endAngle - fst.endAngle);
                v.target.endAngle += (snd.endAngle - fst.endAngle);
            }

            if (v.source.index === s) {
                v.source.startAngle -= (snd.startAngle - fst.startAngle);
                v.source.endAngle -= (snd.startAngle - fst.startAngle);
            }

            if (v.target.index === s) {
                v.target.startAngle -= (snd.startAngle - fst.startAngle);
                v.target.endAngle -= (snd.startAngle - fst.startAngle);
            }

            if (v.source.index > f && v.source.index < s) {
                v.source.startAngle += offsetAngle;
                v.source.endAngle += offsetAngle;
            }

            if (v.target.index > f && v.target.index < s) {
                v.target.startAngle += offsetAngle;
                v.target.endAngle += offsetAngle;
            }

            if ((v.source.index === f || v.source.index === s) && (v.target.index === f || v.target.index === s)) {
                const tmp = v.source.index;
                v.source.index = v.target.index;
                v.target.index = tmp;
            }
            else if (v.source.index === f) {
                v.source.index = s;
            }
            else if (v.target.index === f) {
                v.target.index = s;
            }
            else if (v.source.index === s) {
                v.source.index = f;
            }
            else if (v.target.index === s) {
                v.target.index = f;
            }
        });

        // Swap array positions.
        const tmp = chords.groups[f]
        chords.groups[f] = chords.groups[s];
        chords.groups[s] = tmp;

        return chords;
    },

    swapGroups: (data, eventKey, chords, i, j) => {
        Diagram.swapGroupArcs(chords, i, j);
        Matrices.swapIndices(data.tourneys[eventKey].teams, i, j);
        return chords;
    },

    getCountryName: (data, eventKey, n) => {
        const team = data.tourneys[eventKey].teams[n];
        return data.countries[team.cId];
    },

    getPopulation: (data, eventKey, n) => {
        const team = data.tourneys[eventKey].teams[n];
        return team.p;
    },

    getGoalsFor: (data, eventKey, n) => {
        const team = data.tourneys[eventKey].teams[n];
        return team.gf;
    },

    getGoalsAgainst: (data, eventKey, n) => {
        const team = data.tourneys[eventKey].teams[n];
        return team.ga;
    },

    build: (data, eventKey, sort, SORT_TYPES, matrix) => {
        const svg = d3.select("svg"),
            width = +svg.attr("width"),
            height = +svg.attr("height"),
            outerArcThickness = 5,
            outerRadius = Math.min(width, height) * 0.5 - 125,
            innerRadius = outerRadius - outerArcThickness;

        const chords = d3.chord()
            .padAngle(0.05)
            .call(null, matrix);

        let sortedChords = chords;
        switch (sort) {
            case SORT_TYPES.COUNTRY:
                sortedChords = Sorter.sort(chords, 0, chords.groups.length - 1,
                Diagram.getCountryName.bind(null, data, eventKey),
                Diagram.swapGroups.bind(null, data, eventKey));
                break;
            case SORT_TYPES.GOALS:
                sortedChords = Sorter.sort(chords, 0, chords.groups.length - 1,
                Diagram.getGoalsFor.bind(null, data, eventKey),
                Diagram.swapGroups.bind(null, data, eventKey));
                break;
            case SORT_TYPES.POPULATION:
                sortedChords = Sorter.sort(chords, 0, chords.groups.length - 1,
                Diagram.getPopulation.bind(null, data, eventKey),
                Diagram.swapGroups.bind(null, data, eventKey));
                break;
        }

        const arc = d3.arc()
            .innerRadius(innerRadius)
            .outerRadius(outerRadius);

        const ribbon = d3.ribbon()
            .radius(innerRadius);

        // const color = d3.scaleOrdinal(d3.schemeCategory20);
        // const color = d3.scaleOrdinal(d3.schemeCategory10);

        const len = data.tourneys[eventKey].teams.length;
        // const color = d3.scaleLinear().domain([0, len]).range(["#edf8b1", "#081d58"]).interpolate(d3.interpolateRgb);
        // const color = d3.scaleLinear().domain([0, len]).range(["#aaa", "green"]).interpolate(d3.interpolateRgb);
        const color = d3.scaleLinear().domain([0, len]).range(["gainsboro", "darkgreen"]).interpolate(d3.interpolateRgb);

        // const colors = ["#ffffcc","#c7e9b4","#7fcdbb","#41b6c4","#1d91c0","#225ea8","#0c2c84"];
        // const colors = ["#7fcdbb","#41b6c4","#1d91c0","#225ea8","#253494","#081d58"];
        // const color = i => colors[i % colors.length];

        const g = svg.append("g")
            .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")")
            .datum(sortedChords);

        const group = g.append("g")
            .attr("class", "groups")
            .selectAll("g")
            .data(chords => chords.groups)
            .enter().append("g");

        group.append("path")
            .style("fill", d => color(d.index))
            .style("stroke", d => d3.rgb(color(d.index)).darker())
            .attr("d", arc);

        g.append("g")
            .attr("class", "ribbons")
            .selectAll("path")
            .data(function(chords) { return chords; })
            .enter().append("path")
            .attr("d", ribbon)
            .attr("data-round-id", (d) => {
                const t1 = data.tourneys[eventKey].teams[d.source.index];
                const t2 = data.tourneys[eventKey].teams[d.target.index];

                const game = data.tourneys[eventKey].games.find(v => {
                    return (v.t1 === t1.tId || v.t1 === t2.tId) && (v.t2 === t1.tId || v.t2 === t2.tId);
                });

                return game.rId;
            })
            .style("fill", (d) => color(d.target.index))
            .style("stroke", (d) => d3.rgb(color(d.target.index)).darker())
            .classed("ribbon", true)
            .append("title")
            .text(function(d) {
                const t1 = data.tourneys[eventKey].teams[d.source.index];
                const t2 = data.tourneys[eventKey].teams[d.target.index];

                const c1 = data.countries[t1.cId];
                const c2 = data.countries[t2.cId];

                const game = data.tourneys[eventKey].games.find(v => {
                return (v.t1 === t1.tId || v.t1 === t2.tId) && (v.t2 === t1.tId || v.t2 === t2.tId);
            });

            const e1 = game.se1 ? `(+${game.se1} in extended time)` : '';
            const e2 = game.se2 ? `(+${game.se2} in extended time)` : '';

            const p1 = game.sp1 ? `(+${game.sp1} in penalties)` : '';
            const p2 = game.sp2 ? `(+${game.sp2} in penalties)` : '';

            return `${c1}: ${game.s1} ${e1} ${p1}\n${c2}: ${game.s2} ${e2} ${p2}`;
        });

        group.append("text")
            .each(function(d) { d.angle = (d.startAngle + d.endAngle) / 2; })
            .attr("dy", ".35em")
            .attr("transform", function(d) {
                return "rotate(" + (d.angle * 180 / Math.PI - 91) + ")"
                + "translate(" + (innerRadius + 26) + ")"
                + (d.angle > Math.PI ? "rotate(180)" : "");
            })
            .style("text-anchor", function(d) { return d.angle > Math.PI ? "end" : null; })
            .text(function(d) {
                const team = data.tourneys[eventKey].teams[d.index];
                let metric = '';

                switch (sort) {
                    case SORT_TYPES.GOALS:
                        metric = `(${team.gf})`;
                        break;
                    case SORT_TYPES.POPULATION:
                        metric = `(${Number(team.p).toLocaleString()})`;
                        break;
                }

                return `${data.countries[team.cId]} ${metric}`;
            });
    },
};

export default Diagram;