import {ComponentDef, EndpointDef, SystemDef} from "../systemGenService";
import path from "path";
import {
    componentDestination,
    initializeComponentFile,
    removeTemplateFiles,
    removeTemplateFolder,
    uppercaseFirstLetter
} from "../helpers";
import fs from "fs";
import {buildServiceFunctionName, getFuncParams} from "../views/service-creator";
import {METHOD, URL} from "../views/routes-creator";
import {buildDetailsView} from "./details-view-builder";
import {buildListView} from "./list-view-builder";
import {buildEditorView} from "./editor-view-builder";
import {buildTypesView} from "./types-view-builder";
import {buildRoute} from "./route-view-builder";
import {buildAppLinks} from "./app-view-builder";
const ncp = require('ncp').ncp;

export function createFrontend(systemDef: SystemDef): Promise<void> {
    let fePromises = [];
    for (let i in systemDef.components) {
        fePromises.push(createComponent(systemDef.components[i], systemDef).then(() => {
            // build app router logic
            return buildRoute(systemDef.components[i], componentDestination(systemDef.name, systemDef.components[i].component), systemDef);
        }).then(() => {
            // add a vue view and add it to App.vue
            return buildAppLinks(systemDef.components[i], componentDestination(systemDef.name, systemDef.components[i].component), systemDef);
        }).then(() => {
            return removeTemplateFiles(componentDestination(systemDef.name, systemDef.components[i].component));
        }));

    }
    // TODO: after all is done clean up the template files
    return Promise.all(fePromises).then((res: void[]) => {
        return removeTemplateFolder(componentDestination(systemDef.name, '{{component}}')).catch((err) => {
            console.log(err);
        });
    });
}

function componentSource() {
    return path.join(process.cwd(), 'frontend-frame', 'src', 'components', '{{component}}');
}



function createComponent(component: ComponentDef, systemDef: SystemDef) {
    return new Promise<void>((componentResolve, componentReject) => {
        ncp(componentSource(), componentDestination(systemDef.name, component.component), (err: any) => {
           if (err) {
               console.log(err);
               componentReject();
               return;
           } else {
               let componentDest: string = componentDestination(systemDef.name, component.component);
               let servicePromise = initializeComponentFile(path.join(componentDest, '{{component}}Service.ets'), path.join(componentDest, `${component.component}Service.ts`), component.component, systemDef.name);
               for (let i in component.endpoints) {
                   servicePromise = servicePromise.then(() => {
                       return insertFEServiceCode(component.endpoints[i], componentDest);
                   });
                   // TODO: use templates for Details, Editor, List and Types view based on the endpoints provided
                   // servicePromise = servicePromise.then(() => {
                   //
                   //     return initializeComponentFile(path.join(componentDest, '{{component}}Service.ets'), path.join(componentDest, `${component.component}Service.ts`), component.component, systemDef.name);
                   // });
               }
               if (componentContains('list', component)) {
                   servicePromise = servicePromise.then(() => {
                       return initializeComponentFile(path.join(componentDest, '{{component}}List.vue'), path.join(componentDest, `${component.component}List.vue`), component.component, systemDef.name);
                   }).then(() => {
                       // TODO: build list contents based on the list endpoint
                       return buildListView(component, componentDest, systemDef);
                   });
               }
               if (componentContains('item', component)) {
                   servicePromise = servicePromise.then(() => {
                       return initializeComponentFile(path.join(componentDest, '{{component}}Details.vue'), path.join(componentDest, `${component.component}Details.vue`), component.component, systemDef.name);
                   }).then(() => {
                       // build list contents based on the item endpoint
                       return buildDetailsView(component, componentDest, systemDef);
                   });
               }
               if (componentContains('update', component) || componentContains('create', component)) {
                   servicePromise = servicePromise.then(() => {
                       return initializeComponentFile(path.join(componentDest, '{{component}}Editor.vue'), path.join(componentDest, `${component.component}Editor.vue`), component.component, systemDef.name);
                   }).then(() => {
                       // build list contents based on the item endpoint
                       return buildEditorView(component, componentDest, systemDef);
                   });
               }
               if (component.endpoints.length) {
                   // add a types file to power the whole component
                   servicePromise = servicePromise.then(() => {
                       return initializeComponentFile(path.join(componentDest, '{{component}}Types.ets'), path.join(componentDest, `${component.component}Types.ts`), component.component, systemDef.name);
                   }).then(() => {
                       return buildTypesView(component, componentDest, systemDef);
                   });
               }
               servicePromise.then(() => {
                   componentResolve();
               });
           }
        });
    });
}

function componentContains(type: string, component: ComponentDef) {
    return component.endpoints.some((epd: EndpointDef) => {
        return epd.type === type;
    });
}

function insertFEServiceCode(view: EndpointDef, outDir: string) {
    return new Promise<void>((resolve) => {
        const separator: string = `// SYSTEM-BUILDER-service-functions`;
        let fileLocation = path.join(outDir, `${view.component}Service.ts`)
        let initServiceFile: string = fs.readFileSync(fileLocation, 'utf8');
        let parts = initServiceFile.split(separator);
        parts[0] = parts[0] + createFEServiceFunc(view);
        let newServiceFile = parts.join(separator);
        fs.writeFileSync(fileLocation, newServiceFile, 'utf8');
        resolve();
    });
}

function createFEServiceFunc(view: EndpointDef): string {
    let func: string = '';
    let isListOrSearch: boolean = view.type === 'list' || view.type === 'search';
    let funcName: string = buildServiceFunctionName(view);
    let funcParams: string[] = getFuncParams(view, true);
    let columnParams: string[] = view.columns?.filter(column => column.param).map(column => { return '\n      ' + column.param + ': ' + column.param; });
    let filterParams: string[] = view.filters?.filter(filter => filter.param).map(filter => { return '\n      ' + filter.param + ': ' + filter.param; }) || [];

    if (isListOrSearch) {
        funcParams.push('offset: number');
        funcParams.push('limit: number');
        filterParams.push('\n      offset: offset');
        filterParams.push('\n      limit: limit');
    }

    let isGetOrDelete = view.type === 'item' || view.type === 'delete';
    let method = METHOD[view.type];
    if (method === 'delete') {
        method = 'del';
    }
    let addTypeDeclaration = method === 'get' || method === 'post';
    let useList = view.type === 'list' || view.type === 'search';
    let url = view.component + '/' + URL[view.type](view).replace(':' + view.component + '_id', '\' + ' + view.component + '_id');
    let isUpdateOrCreate = view.type === 'update' || view.type === 'create';

    func = `
  public ${funcName}(${view.type === 'update' ? view.component + '_id: string, ': ''}${isUpdateOrCreate ? 'params: ' + uppercaseFirstLetter(view.component) + 'Config' : funcParams.join(', ')}) {`;

    if (!isGetOrDelete && !isUpdateOrCreate) {
        func = func + `
    let params = {${columnParams}${columnParams.length ? ',' : ''}${filterParams}
    };`;
    }
    func = func + `
    return ${method}${addTypeDeclaration ? '<' + uppercaseFirstLetter(view.component) + 'Config' + (useList ? '[]' : '') + '>': ''}('/api/v1/${url}${isGetOrDelete ? '' : (view.type === 'update' ? ', params' : '\', params')});
  }
`;
    return func;
}