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/*
 * Copyright (C) 2016-2017  Alex Yatskov <alex@foosoft.net>
 * Author: Alex Yatskov <alex@foosoft.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


function apiOptionsGet(optionsContext) {
    return utilBackend().getOptions(optionsContext);
}

function apiOptionsGetFull() {
    return utilBackend().getFullOptions();
}

async function apiOptionsSave(source) {
    const backend = utilBackend();
    const options = await apiOptionsGetFull();
    await optionsSave(options);
    backend.onOptionsUpdated(source);
}

async function apiTermsFind(text, optionsContext) {
    const options = await apiOptionsGet(optionsContext);
    const translator = utilBackend().translator;

    const searcher = {
        'merge': translator.findTermsMerged,
        'split': translator.findTermsSplit,
        'group': translator.findTermsGrouped
    }[options.general.resultOutputMode].bind(translator);

    const {definitions, length} = await searcher(
        text,
        dictEnabledSet(options),
        options.scanning.alphanumeric,
        options
    );

    return {
        length,
        definitions: definitions.slice(0, options.general.maxResults)
    };
}

async function apiKanjiFind(text, optionsContext) {
    const options = await apiOptionsGet(optionsContext);
    const definitions = await utilBackend().translator.findKanji(text, dictEnabledSet(options));
    return definitions.slice(0, options.general.maxResults);
}

async function apiDefinitionAdd(definition, mode, context, optionsContext) {
    const options = await apiOptionsGet(optionsContext);

    if (mode !== 'kanji') {
        await audioInject(
            definition,
            options.anki.terms.fields,
            options.audio.sources,
            optionsContext
        );
    }

    if (context && context.screenshot) {
        await apiInjectScreenshot(
            definition,
            options.anki.terms.fields,
            context.screenshot
        );
    }

    const note = await dictNoteFormat(definition, mode, options);
    return utilBackend().anki.addNote(note);
}

async function apiDefinitionsAddable(definitions, modes, optionsContext) {
    const options = await apiOptionsGet(optionsContext);
    const states = [];

    try {
        const notes = [];
        for (const definition of definitions) {
            for (const mode of modes) {
                const note = await dictNoteFormat(definition, mode, options);
                notes.push(note);
            }
        }

        const cannotAdd = [];
        const anki = utilBackend().anki;
        const results = await anki.canAddNotes(notes);
        for (let resultBase = 0; resultBase < results.length; resultBase += modes.length) {
            const state = {};
            for (let modeOffset = 0; modeOffset < modes.length; ++modeOffset) {
                const index = resultBase + modeOffset;
                const result = results[index];
                const info = {canAdd: result};
                state[modes[modeOffset]] = info;
                if (!result) {
                    cannotAdd.push([notes[index], info]);
                }
            }

            states.push(state);
        }

        if (cannotAdd.length > 0) {
            const noteIdsArray = await anki.findNoteIds(cannotAdd.map(e => e[0]));
            for (let i = 0, ii = Math.min(cannotAdd.length, noteIdsArray.length); i < ii; ++i) {
                const noteIds = noteIdsArray[i];
                if (noteIds.length > 0) {
                    cannotAdd[i][1].noteId = noteIds[0];
                }
            }
        }
    } catch (e) {
        // NOP
    }

    return states;
}

async function apiNoteView(noteId) {
    return utilBackend().anki.guiBrowse(`nid:${noteId}`);
}

async function apiTemplateRender(template, data, dynamic) {
    if (dynamic) {
        return handlebarsRenderDynamic(template, data);
    } else {
        return handlebarsRenderStatic(template, data);
    }
}

async function apiCommandExec(command) {
    const handlers = apiCommandExec.handlers;
    if (handlers.hasOwnProperty(command)) {
        const handler = handlers[command];
        handler();
    }
}
apiCommandExec.handlers = {
    search: () => {
        chrome.tabs.create({url: chrome.extension.getURL('/bg/search.html')});
    },

    help: () => {
        chrome.tabs.create({url: 'https://foosoft.net/projects/yomichan/'});
    },

    options: () => {
        chrome.runtime.openOptionsPage();
    },

    toggle: async () => {
        const optionsContext = {
            depth: 0,
            url: window.location.href
        };
        const options = await apiOptionsGet(optionsContext);
        options.general.enable = !options.general.enable;
        await apiOptionsSave('popup');
    }
};

async function apiAudioGetUrl(definition, source, optionsContext) {
    return audioGetUrl(definition, source, optionsContext);
}

async function apiInjectScreenshot(definition, fields, screenshot) {
    let usesScreenshot = false;
    for (const name in fields) {
        if (fields[name].includes('{screenshot}')) {
            usesScreenshot = true;
            break;
        }
    }

    if (!usesScreenshot) {
        return;
    }

    const dateToString = (date) => {
        const year = date.getUTCFullYear();
        const month = date.getUTCMonth().toString().padStart(2, '0');
        const day = date.getUTCDate().toString().padStart(2, '0');
        const hours = date.getUTCHours().toString().padStart(2, '0');
        const minutes = date.getUTCMinutes().toString().padStart(2, '0');
        const seconds = date.getUTCSeconds().toString().padStart(2, '0');
        return `${year}-${month}-${day}-${hours}-${minutes}-${seconds}`;
    };

    const now = new Date(Date.now());
    const filename = `yomichan_browser_screenshot_${definition.reading}_${dateToString(now)}.${screenshot.format}`;
    const data = screenshot.dataUrl.replace(/^data:[\w\W]*?,/, '');

    try {
        await utilBackend().anki.storeMediaFile(filename, data);
    } catch (e) {
        return;
    }

    definition.screenshotFileName = filename;
}

function apiScreenshotGet(options, sender) {
    if (!(sender && sender.tab)) {
        return Promise.resolve();
    }

    const windowId = sender.tab.windowId;
    return new Promise((resolve) => {
        chrome.tabs.captureVisibleTab(windowId, options, (dataUrl) => resolve(dataUrl));
    });
}

function apiForward(action, params, sender) {
    if (!(sender && sender.tab)) {
        return Promise.resolve();
    }

    const tabId = sender.tab.id;
    return new Promise((resolve) => {
        chrome.tabs.sendMessage(tabId, {action, params}, (response) => resolve(response));
    });
}

function apiFrameInformationGet(sender) {
    const frameId = sender.frameId;
    return Promise.resolve({frameId});
}

function apiInjectStylesheet(css, sender) {
    if (!sender.tab) {
        return Promise.reject(new Error('Invalid tab'));
    }

    const tabId = sender.tab.id;
    const frameId = sender.frameId;
    const details = {
        code: css,
        runAt: 'document_start',
        cssOrigin: 'user',
        allFrames: false
    };
    if (typeof frameId === 'number') {
        details.frameId = frameId;
    }

    return new Promise((resolve, reject) => {
        chrome.tabs.insertCSS(tabId, details, () => {
            const e = chrome.runtime.lastError;
            if (e) {
                reject(new Error(e.message));
            } else {
                resolve();
            }
        });
    });
}

async function apiGetEnvironmentInfo() {
    const browser = await apiGetBrowser();
    const platform = await new Promise((resolve) => chrome.runtime.getPlatformInfo(resolve));
    return {
        browser,
        platform: {
            os: platform.os
        }
    };
}

async function apiGetBrowser() {
    if (EXTENSION_IS_BROWSER_EDGE) {
        return 'edge';
    }
    if (typeof browser !== 'undefined') {
        try {
            const info = await browser.runtime.getBrowserInfo();
            if (info.name === 'Fennec') {
                return 'firefox-mobile';
            }
        } catch (e) { }
        return 'firefox';
    } else {
        return 'chrome';
    }
}