/**
 * Copyright (c) 2017 mol* contributors, licensed under MIT, See LICENSE file for more info.
 *
 * @author David Sehnal <david.sehnal@gmail.com>
 */

import * as B from 'benchmark'

import * as util from 'util'
import * as fs from 'fs'
import fetch from 'node-fetch'
import CIF from 'mol-io/reader/cif'

import { Structure, Model, Queries as Q, Element, ElementGroup, ElementSet, Selection, Symmetry, Unit } from 'mol-model/structure'
import { Segmentation, OrderedSet } from 'mol-data/int'

import to_mmCIF from 'mol-model/structure/export/mmcif'
import { Run } from 'mol-task';
import { EquivalenceClasses } from 'mol-data/util';

require('util.promisify').shim();
const readFileAsync = util.promisify(fs.readFile);
const writeFileAsync = util.promisify(fs.writeFile);

async function readData(path: string) {
    if (path.match(/\.bcif$/)) {
        const input = await readFileAsync(path)
        const data = new Uint8Array(input.byteLength);
        for (let i = 0; i < input.byteLength; i++) data[i] = input[i];
        return data;
    } else {
        return readFileAsync(path, 'utf8');
    }
}

(Symbol as any).asyncIterator = (Symbol as any).asyncIterator || Symbol.for('Symbol.asyncIterator');

interface ProgressGenerator<T> extends AsyncIterableIterator<number | T> {
    next(cont?: boolean): Promise<IteratorResult<number | T>>
}

async function *test(): ProgressGenerator<boolean> {
    const r = yield await new Promise<number>(res => res(10));
    return r;
}

async function runIt(itP: () => ProgressGenerator<boolean>) {
    const it = itP();
    while (true) {
        const { value, done } = await it.next(true);
        if (done) return value;
    }
}

runIt(test).then(r => console.log('rerdasdasda', r))

export async function readCIF(path: string) {
    console.time('readData');
    const input = await readData(path)
    console.timeEnd('readData');

    console.time('parse');
    const comp = typeof input === 'string' ? CIF.parseText(input) : CIF.parseBinary(input);
    const parsed = await Run(comp);
    console.timeEnd('parse');
    if (parsed.isError) {
        throw parsed;
    }

    const data = parsed.result.blocks[0];
    console.time('schema')
    const mmcif = CIF.schema.mmCIF(data);

    console.timeEnd('schema')
    console.time('buildModels')
    const models = Model.create({ kind: 'mmCIF', data: mmcif });
    console.timeEnd('buildModels')
    const structures = models.map(Structure.ofModel);

    return { mmcif, models, structures };
}

const DATA_DIR = './build/data';
if (!fs.existsSync(DATA_DIR)) fs.mkdirSync(DATA_DIR);

function getBcifUrl(pdbId: string) {
    return `http://www.ebi.ac.uk/pdbe/coordinates/${pdbId.toLowerCase()}/full?encoding=bcif`
}

function getBcifPath(pdbId: string) {
    return `${DATA_DIR}/${pdbId.toLowerCase()}_full.bcif`
}

async function ensureBcifAvailable(pdbId: string) {
    const bcifPath = getBcifPath(pdbId);
    if (!fs.existsSync(bcifPath)) {
        console.log(`downloading ${pdbId} bcif...`)
        const data = await fetch(getBcifUrl(pdbId))
        await writeFileAsync(bcifPath, await data.buffer())
        console.log(`done downloading ${pdbId} bcif`)
    }
}

export async function getBcif(pdbId: string) {
    await ensureBcifAvailable(pdbId);
    return await readCIF(getBcifPath(pdbId));
}

export namespace PropertyAccess {
    function baseline(model: Model) {
        if (model.sourceData.kind !== 'mmCIF') throw new Error('Model must be mmCIF');
        const atom_site = model.sourceData.data.atom_site;
        const id = atom_site.id.value;
        let s = 0;
        for (let i = 0, _i = atom_site._rowCount; i < _i; i++) {
            s += id(i);
        }
        return s;
    }

    function sumProperty(structure: Structure, p: Element.Property<number>) {
        const { elements, units } = structure;
        const unitIds = ElementSet.unitIds(elements);
        const l = Element.Location();

        let s = 0;

        for (let i = 0, _i = unitIds.length; i < _i; i++) {
            l.unit = units[unitIds[i]];
            const set = ElementSet.unitGetByIndex(elements, i);


            for (let j = 0, _j = ElementGroup.size(set); j < _j; j++) {
                l.element= ElementGroup.getAt(set, j);
                s += p(l);
            }
        }

        return s;
    }

    function sumPropertySegmented(structure: Structure, p: Element.Property<number>) {
        const { elements, units } = structure;
        const unitIds = ElementSet.unitIds(elements);
        const l = Element.Location();

        let s = 0;

        let vA = 0, cC = 0, rC = 0;
        for (let i = 0, _i = unitIds.length; i < _i; i++) {
            const unit = units[unitIds[i]];
            l.unit = unit;
            const set = ElementSet.unitGetByIndex(elements, i);

            const chainsIt = Segmentation.transientSegments(unit.hierarchy.chainSegments, set.elements);
            const residues = unit.hierarchy.residueSegments;
            while (chainsIt.hasNext) {
                cC++;

                const chainSegment = chainsIt.move();
                const residuesIt = Segmentation.transientSegments(residues, set.elements, chainSegment);
                while (residuesIt.hasNext) {
                    rC++;
                    const residueSegment = residuesIt.move();
                    // l.element= OrdSet.getAt(set, residueSegment.start);
                    // console.log(unit.hierarchy.residues.auth_comp_id.value(unit.residueIndex[l.atom]), l.atom, OrdSet.getAt(set, residueSegment.end))
                    for (let j = residueSegment.start, _j = residueSegment.end; j < _j; j++) {
                        l.element= ElementGroup.getAt(set, j);
                        vA++;
                        s += p(l);
                    }
                }
            }
        }

        console.log('seg atom count', vA, cC, rC);

        return s;
    }

    // function sumPropertyResidue(structure: Structure, p: Element.Property<number>) {
    //     const { atoms, units } = structure;
    //     const unitIds = ElementSet.unitIds(atoms);
    //     const l = Element.Location();

    //     let s = 0;

    //     for (let i = 0, _i = unitIds.length; i < _i; i++) {
    //         const unit = units[unitIds[i]];
    //         l.unit = unit;
    //         const set = ElementSet.unitGetByIndex(atoms, i);
    //         const residuesIt = Segmentation.transientSegments(unit.hierarchy.residueSegments, set.atoms);
    //         while (residuesIt.hasNext) {
    //             l.element= ElementGroup.getAt(set, residuesIt.move().start);
    //             s += p(l);
    //         }
    //     }

    //     return s;
    // }

    function sumPropertyAtomSetIt(structure: Structure, p: Element.Property<number>) {
        const { elements, units } = structure;

        let s = 0;
        const atomsIt = ElementSet.elements(elements);
        const l = Element.Location();
        while (atomsIt.hasNext) {
            const a = atomsIt.move();
            l.unit = units[Element.unit(a)];
            l.element= Element.index(a);
            s += p(l);
        }
        return s;
    }

    // function sumPropertySegmentedMutable(structure: Structure, p: Property<number>) {
    //     const { atoms, units } = structure;
    //     const unitIds = ElementSet.unitIds(atoms);
    //     const l = Property.createLocation();

    //     let s = 0;

    //     for (let i = 0, _i = unitIds.length; i < _i; i++) {
    //         const unit = units[unitIds[i]];
    //         l.unit = unit;
    //         const set = ElementSet.unitGetByIndex(atoms, i);

    //         const chainsIt = Segmentation.transientSegments(unit.hierarchy.chainSegments, set);
    //         const residuesIt = Segmentation.transientSegments(unit.hierarchy.residueSegments, set);
    //         while (chainsIt.hasNext) {
    //             const chainSegment = chainsIt.move();
    //             residuesIt.updateRange(chainSegment);
    //             while (residuesIt.hasNext) {
    //                 const residueSegment = residuesIt.move();
    //                 for (let j = residueSegment.start, _j = residueSegment.end; j < _j; j++) {
    //                     l.element= OrdSet.getAt(set, j);
    //                     s += p(l);
    //                 }
    //             }
    //         }
    //     }

    //     return s;
    // }

    // function sumDirect(structure: Structure) {
    //     const { atoms, units } = structure;
    //     const unitIds = ElementSet.unitIds(atoms);

    //     let s = 0;

    //     for (let i = 0, _i = unitIds.length; i < _i; i++) {
    //         const unitId = unitIds[i];
    //         const unit = units[unitId];
    //         const set = ElementSet.unitGetByIndex(atoms, i);
    //         //const { residueIndex, chainIndex } = unit;
    //         const p = unit.conformation.atomId.value;
    //         for (let j = 0, _j = ElementGroup.size(set); j < _j; j++) {
    //             const aI = ElementGroup.getAt(set, j);
    //             s += p(aI);
    //         }
    //     }

    //     return s;
    // }

    // function concatProperty(structure: Structure, p: Property<string>) {
    //     const { atoms, units } = structure;
    //     const unitIds = ElementSet.unitIds(atoms);
    //     const l = Property.createLocation(structure);

    //     let s = [];

    //     for (let i = 0, _i = unitIds.length; i < _i; i++) {
    //         const unitId = unitIds[i];
    //         l.unit = units[unitId];
    //         const set = ElementSet.unitGetByIndex(atoms, i);
    //         const { residueIndex, chainIndex } = l.unit;

    //         for (let j = 0, _j = OrdSet.size(set); j < _j; j++) {
    //             const aI = OrdSet.getAt(set, j);
    //             l.element= aI;
    //             l.residueIndex = residueIndex[aI];
    //             l.chainIndex = chainIndex[aI];
    //             s[s.length] = p(l);
    //         }
    //     }

    //     return s;
    // }

    export function write(s: Structure) {
        console.log(to_mmCIF('test', s));
    }

    export function testAssembly(id: string, s: Structure) {
        console.time('assembly')
        const a = Symmetry.buildAssembly(s, '1');
        console.timeEnd('assembly')
        fs.writeFileSync(`${DATA_DIR}/${id}_assembly.bcif`, to_mmCIF(id, a, true));
        console.log('exported');
    }

    export function testGrouping(structure: Structure) {
        const { elements, units } = Symmetry.buildAssembly(structure, '1');
        console.log('grouping', units.length);
        console.log('built asm');

        const uniqueGroups = EquivalenceClasses<number, { unit: Unit, group: ElementGroup }>(
            ({ unit, group }) => ElementGroup.hashCode(group),
            (a, b) => a.unit.model.id === b.unit.model.id && (a.group.key === b.group.key && OrderedSet.areEqual(a.group.elements, b.group.elements))
        );

        for (let i = 0, _i = ElementSet.unitCount(elements); i < _i; i++) {
            const group = ElementSet.unitGetByIndex(elements, i);
            const unitId = ElementSet.unitGetId(elements, i);
            uniqueGroups.add(unitId, { unit: units[unitId], group });
        }

        console.log('group count', uniqueGroups.groups.length);
    }

    export async function run() {
        //const { structures, models/*, mmcif*/ } = await getBcif('1cbs');
        // const { structures, models } = await getBcif('3j3q');

        const { structures, models /*, mmcif*/ } = await readCIF('e:/test/quick/1hrv_updated.cif');
        const { structures: s1, /*, mmcif*/ } = await readCIF('e:/test/quick/1tqn_updated.cif');

        testGrouping(structures[0]);
        console.log('------');
        testGrouping(s1[0]);
        //const { structures, models/*, mmcif*/ } = await readCIF('e:/test/quick/5j7v_updated.cif');

        //console.log(mmcif.pdbx_struct_oper_list.matrix.toArray());
        // console.log(mmcif.pdbx_struct_oper_list.vector.toArray());

        // testAssembly('5j7v', structures[0]);
        // throw '';

        // console.log(models[0].symmetry.assemblies);


        //const { structures, models } = await readCIF('e:/test/molstar/3j3q.bcif');

        // fs.writeFileSync('e:/test/molstar/3j3q.bcif', to_mmCIF('test', structures[0], true));
        // return;

        // console.log(toMmCIFString('test', structures[0]));

        // return;

        console.log('bs', baseline(models[0]));
        console.log('sp', sumProperty(structures[0], l => l.unit.model.conformation.atomId.value(l.element)));
        console.log(sumPropertySegmented(structures[0], l => l.unit.model.conformation.atomId.value(l.element)));

        //console.log(sumPropertySegmentedMutable(structures[0], l => l.unit.model.conformation.atomId.value(l.element));
        console.log(sumPropertyAtomSetIt(structures[0], l => l.unit.model.conformation.atomId.value(l.element)));
        //console.log(sumProperty(structures[0], Property.cachedAtomColumn(m => m.conformation.atomId)));
        //console.log(sumDirect(structures[0]));
        //console.log('r', sumPropertyResidue(structures[0], l => l.unit.hierarchy.residues.auth_seq_id.value(l.unit.residueIndex[l.atom])));

        console.time('atom.x');
        console.log('atom.x', sumProperty(structures[0], Q.props.atom.x));
        console.timeEnd('atom.x');
        console.time('__x')
        //console.log('__x', sumProperty(structures[0], l => l.unit.conformation.x[l.atom]));
        console.timeEnd('__x')

        //const authSeqId = Element.property(l => l.unit.hierarchy.residues.auth_seq_id.value(l.unit.residueIndex[l.atom]));

        //const auth_seq_id = Q.props.residue.auth_seq_id;
        const auth_comp_id = Q.props.residue.auth_comp_id;
        //const auth_asym_id = Q.props.chain.auth_asym_id;
        //const set =  new Set(['A', 'B', 'C', 'D']);
        //const q = Q.generators.atomGroups({ atomTest: l => auth_seq_id(l) < 3 });
        const q = Q.generators.atoms({ atomTest: Q.pred.eq(Q.props.residue.auth_comp_id, 'ALA') });
        const P = Q.props
        //const q0 = Q.generators.atoms({ atomTest: l => auth_comp_id(l) === 'ALA' });
        const q1 = Q.generators.atoms({ residueTest: l => auth_comp_id(l) === 'ALA' });
        const q2 = Q.generators.atoms({ residueTest: l => auth_comp_id(l) === 'ALA', groupBy: Q.props.residue.key });
        const q3 = Q.generators.atoms({
            chainTest: Q.pred.inSet(P.chain.auth_asym_id, ['A', 'B', 'C', 'D']),
            residueTest: Q.pred.eq(P.residue.auth_comp_id, 'ALA')
        });
        q(structures[0]);
        //console.log(to_mmCIF('test', Selection.union(q0r)));

        console.time('q1')
        q1(structures[0]);
        console.timeEnd('q1')
        console.time('q1')
        q1(structures[0]);
        console.timeEnd('q1')
        console.time('q2')
        const q2r = q2(structures[0]);
        console.timeEnd('q2')
        console.log(Selection.structureCount(q2r));
        //console.log(q1(structures[0]));

        //const col = models[0].conformation.atomId.value;
        const suite = new B.Suite();
        suite
            //.add('test q', () => q1(structures[0]))
            //.add('test q', () => q(structures[0]))
            .add('test q1', () => q1(structures[0]))
            .add('test q3', () => q3(structures[0]))
            //.add('test int', () => sumProperty(structures[0], l => col(l.element))
            // .add('sum residue', () => sumPropertyResidue(structures[0], l => l.unit.hierarchy.residues.auth_seq_id.value(l.unit.residueIndex[l.atom])))

            // .add('baseline', () =>  baseline(models[0]))
            // .add('direct', () =>  sumDirect(structures[0]))
            //.add('normal int', () => sumProperty(structures[0], l => l.unit.model.conformation.atomId.value(l.element))
            //.add('atom set it int', () => sumPropertyAtomSetIt(structures[0], l => l.unit.conformation.atomId.value(l.element))
            // .add('segmented faster int', () => sumPropertySegmented(structures[0], l => l.unit.conformation.atomId.value(l.element))
            // .add('faster int', () => sumProperty(structures[0], l => l.unit.conformation.atomId.value(l.element))
            //.add('segmented faster _x', () => sumPropertySegmented(structures[0], l => l.unit.conformation.__x[l.atom]))
            //.add('faster _x', () => sumProperty(structures[0], l => l.unit.conformation.__x[l.atom] +  l.unit.conformation.__y[l.atom] +  l.unit.conformation.__z[l.atom]))
            //.add('segmented mut faster int', () => sumPropertySegmentedMutable(structures[0], l => l.unit.conformation.atomId.value(l.element))
            //.add('normal shortcut int', () => sumProperty(structures[0], l => l.conformation.atomId.value(l.element))
            //.add('cached int', () => sumProperty(structures[0], Property.cachedAtomColumn(m => m.conformation.atomId)))
            //.add('concat str', () => concatProperty(structures[0], l => l.unit.model.hierarchy.atoms.auth_atom_id.value(l.element))
            //.add('cached concat str', () => concatProperty(structures[0], Property.cachedAtomColumn(m => m.hierarchy.atoms.auth_atom_id)))
            .on('cycle', (e: any) => console.log(String(e.target)))
            .run();
    }
}

PropertyAccess.run();