/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
'use strict';
import { DocumentHighlightKind, Location, Range, SymbolKind, TextEdit, FileType } from '../cssLanguageTypes';
import * as l10n from '@vscode/l10n';
import * as nodes from '../parser/cssNodes';
import { Symbols } from '../parser/cssSymbolScope';
import { getColorValue, hslFromColor, hwbFromColor } from '../languageFacts/facts';
import { startsWith } from '../utils/strings';
import { dirname, joinPath } from '../utils/resources';
const startsWithSchemeRegex = /^\w+:\/\//;
const startsWithData = /^data:/;
export class CSSNavigation {
    constructor(fileSystemProvider, resolveModuleReferences) {
        this.fileSystemProvider = fileSystemProvider;
        this.resolveModuleReferences = resolveModuleReferences;
    }
    configure(settings) {
        this.defaultSettings = settings;
    }
    findDefinition(document, position, stylesheet) {
        const symbols = new Symbols(stylesheet);
        const offset = document.offsetAt(position);
        const node = nodes.getNodeAtOffset(stylesheet, offset);
        if (!node) {
            return null;
        }
        const symbol = symbols.findSymbolFromNode(node);
        if (!symbol) {
            return null;
        }
        return {
            uri: document.uri,
            range: getRange(symbol.node, document)
        };
    }
    findReferences(document, position, stylesheet) {
        const highlights = this.findDocumentHighlights(document, position, stylesheet);
        return highlights.map(h => {
            return {
                uri: document.uri,
                range: h.range
            };
        });
    }
    getHighlightNode(document, position, stylesheet) {
        const offset = document.offsetAt(position);
        let node = nodes.getNodeAtOffset(stylesheet, offset);
        if (!node || node.type === nodes.NodeType.Stylesheet || node.type === nodes.NodeType.Declarations) {
            return;
        }
        if (node.type === nodes.NodeType.Identifier && node.parent && node.parent.type === nodes.NodeType.ClassSelector) {
            node = node.parent;
        }
        return node;
    }
    findDocumentHighlights(document, position, stylesheet) {
        const result = [];
        const node = this.getHighlightNode(document, position, stylesheet);
        if (!node) {
            return result;
        }
        const symbols = new Symbols(stylesheet);
        const symbol = symbols.findSymbolFromNode(node);
        const name = node.getText();
        stylesheet.accept(candidate => {
            if (symbol) {
                if (symbols.matchesSymbol(candidate, symbol)) {
                    result.push({
                        kind: getHighlightKind(candidate),
                        range: getRange(candidate, document)
                    });
                    return false;
                }
            }
            else if (node && node.type === candidate.type && candidate.matches(name)) {
                // Same node type and data
                result.push({
                    kind: getHighlightKind(candidate),
                    range: getRange(candidate, document)
                });
            }
            return true;
        });
        return result;
    }
    isRawStringDocumentLinkNode(node) {
        return node.type === nodes.NodeType.Import;
    }
    findDocumentLinks(document, stylesheet, documentContext) {
        const linkData = this.findUnresolvedLinks(document, stylesheet);
        const resolvedLinks = [];
        for (let data of linkData) {
            const link = data.link;
            const target = link.target;
            if (!target || startsWithData.test(target)) {
                // no links for data:
            }
            else if (startsWithSchemeRegex.test(target)) {
                resolvedLinks.push(link);
            }
            else {
                const resolved = documentContext.resolveReference(target, document.uri);
                if (resolved) {
                    link.target = resolved;
                }
                resolvedLinks.push(link);
            }
        }
        return resolvedLinks;
    }
    async findDocumentLinks2(document, stylesheet, documentContext) {
        const linkData = this.findUnresolvedLinks(document, stylesheet);
        const resolvedLinks = [];
        for (let data of linkData) {
            const link = data.link;
            const target = link.target;
            if (!target || startsWithData.test(target)) {
                // no links for data:
            }
            else if (startsWithSchemeRegex.test(target)) {
                resolvedLinks.push(link);
            }
            else {
                const resolvedTarget = await this.resolveReference(target, document.uri, documentContext, data.isRawLink);
                if (resolvedTarget !== undefined) {
                    link.target = resolvedTarget;
                    resolvedLinks.push(link);
                }
            }
        }
        return resolvedLinks;
    }
    findUnresolvedLinks(document, stylesheet) {
        const result = [];
        const collect = (uriStringNode) => {
            let rawUri = uriStringNode.getText();
            const range = getRange(uriStringNode, document);
            // Make sure the range is not empty
            if (range.start.line === range.end.line && range.start.character === range.end.character) {
                return;
            }
            if (startsWith(rawUri, `'`) || startsWith(rawUri, `"`)) {
                rawUri = rawUri.slice(1, -1);
            }
            const isRawLink = uriStringNode.parent ? this.isRawStringDocumentLinkNode(uriStringNode.parent) : false;
            result.push({ link: { target: rawUri, range }, isRawLink });
        };
        stylesheet.accept(candidate => {
            if (candidate.type === nodes.NodeType.URILiteral) {
                const first = candidate.getChild(0);
                if (first) {
                    collect(first);
                }
                return false;
            }
            /**
             * In @import, it is possible to include links that do not use `url()`
             * For example, `@import 'foo.css';`
             */
            if (candidate.parent && this.isRawStringDocumentLinkNode(candidate.parent)) {
                const rawText = candidate.getText();
                if (startsWith(rawText, `'`) || startsWith(rawText, `"`)) {
                    collect(candidate);
                }
                return false;
            }
            return true;
        });
        return result;
    }
    findSymbolInformations(document, stylesheet) {
        const result = [];
        const addSymbolInformation = (name, kind, symbolNodeOrRange) => {
            const range = symbolNodeOrRange instanceof nodes.Node ? getRange(symbolNodeOrRange, document) : symbolNodeOrRange;
            const entry = {
                name: name || l10n.t('<undefined>'),
                kind,
                location: Location.create(document.uri, range)
            };
            result.push(entry);
        };
        this.collectDocumentSymbols(document, stylesheet, addSymbolInformation);
        return result;
    }
    findDocumentSymbols(document, stylesheet) {
        const result = [];
        const parents = [];
        const addDocumentSymbol = (name, kind, symbolNodeOrRange, nameNodeOrRange, bodyNode) => {
            const range = symbolNodeOrRange instanceof nodes.Node ? getRange(symbolNodeOrRange, document) : symbolNodeOrRange;
            let selectionRange = nameNodeOrRange instanceof nodes.Node ? getRange(nameNodeOrRange, document) : nameNodeOrRange;
            if (!selectionRange || !containsRange(range, selectionRange)) {
                selectionRange = Range.create(range.start, range.start);
            }
            const entry = {
                name: name || l10n.t('<undefined>'),
                kind,
                range,
                selectionRange
            };
            let top = parents.pop();
            while (top && !containsRange(top[1], range)) {
                top = parents.pop();
            }
            if (top) {
                const topSymbol = top[0];
                if (!topSymbol.children) {
                    topSymbol.children = [];
                }
                topSymbol.children.push(entry);
                parents.push(top); // put back top
            }
            else {
                result.push(entry);
            }
            if (bodyNode) {
                parents.push([entry, getRange(bodyNode, document)]);
            }
        };
        this.collectDocumentSymbols(document, stylesheet, addDocumentSymbol);
        return result;
    }
    collectDocumentSymbols(document, stylesheet, collect) {
        stylesheet.accept(node => {
            if (node instanceof nodes.RuleSet) {
                for (const selector of node.getSelectors().getChildren()) {
                    if (selector instanceof nodes.Selector) {
                        const range = Range.create(document.positionAt(selector.offset), document.positionAt(node.end));
                        collect(selector.getText(), SymbolKind.Class, range, selector, node.getDeclarations());
                    }
                }
            }
            else if (node instanceof nodes.VariableDeclaration) {
                collect(node.getName(), SymbolKind.Variable, node, node.getVariable(), undefined);
            }
            else if (node instanceof nodes.MixinDeclaration) {
                collect(node.getName(), SymbolKind.Method, node, node.getIdentifier(), node.getDeclarations());
            }
            else if (node instanceof nodes.FunctionDeclaration) {
                collect(node.getName(), SymbolKind.Function, node, node.getIdentifier(), node.getDeclarations());
            }
            else if (node instanceof nodes.Keyframe) {
                const name = l10n.t("@keyframes {0}", node.getName());
                collect(name, SymbolKind.Class, node, node.getIdentifier(), node.getDeclarations());
            }
            else if (node instanceof nodes.FontFace) {
                const name = l10n.t("@font-face");
                collect(name, SymbolKind.Class, node, undefined, node.getDeclarations());
            }
            else if (node instanceof nodes.Media) {
                const mediaList = node.getChild(0);
                if (mediaList instanceof nodes.Medialist) {
                    const name = '@media ' + mediaList.getText();
                    collect(name, SymbolKind.Module, node, mediaList, node.getDeclarations());
                }
            }
            return true;
        });
    }
    findDocumentColors(document, stylesheet) {
        const result = [];
        stylesheet.accept((node) => {
            const colorInfo = getColorInformation(node, document);
            if (colorInfo) {
                result.push(colorInfo);
            }
            return true;
        });
        return result;
    }
    getColorPresentations(document, stylesheet, color, range) {
        const result = [];
        const red256 = Math.round(color.red * 255), green256 = Math.round(color.green * 255), blue256 = Math.round(color.blue * 255);
        let label;
        if (color.alpha === 1) {
            label = `rgb(${red256}, ${green256}, ${blue256})`;
        }
        else {
            label = `rgba(${red256}, ${green256}, ${blue256}, ${color.alpha})`;
        }
        result.push({ label: label, textEdit: TextEdit.replace(range, label) });
        if (color.alpha === 1) {
            label = `#${toTwoDigitHex(red256)}${toTwoDigitHex(green256)}${toTwoDigitHex(blue256)}`;
        }
        else {
            label = `#${toTwoDigitHex(red256)}${toTwoDigitHex(green256)}${toTwoDigitHex(blue256)}${toTwoDigitHex(Math.round(color.alpha * 255))}`;
        }
        result.push({ label: label, textEdit: TextEdit.replace(range, label) });
        const hsl = hslFromColor(color);
        if (hsl.a === 1) {
            label = `hsl(${hsl.h}, ${Math.round(hsl.s * 100)}%, ${Math.round(hsl.l * 100)}%)`;
        }
        else {
            label = `hsla(${hsl.h}, ${Math.round(hsl.s * 100)}%, ${Math.round(hsl.l * 100)}%, ${hsl.a})`;
        }
        result.push({ label: label, textEdit: TextEdit.replace(range, label) });
        const hwb = hwbFromColor(color);
        if (hwb.a === 1) {
            label = `hwb(${hwb.h} ${Math.round(hwb.w * 100)}% ${Math.round(hwb.b * 100)}%)`;
        }
        else {
            label = `hwb(${hwb.h} ${Math.round(hwb.w * 100)}% ${Math.round(hwb.b * 100)}% / ${hwb.a})`;
        }
        result.push({ label: label, textEdit: TextEdit.replace(range, label) });
        return result;
    }
    prepareRename(document, position, stylesheet) {
        const node = this.getHighlightNode(document, position, stylesheet);
        if (node) {
            return Range.create(document.positionAt(node.offset), document.positionAt(node.end));
        }
    }
    doRename(document, position, newName, stylesheet) {
        const highlights = this.findDocumentHighlights(document, position, stylesheet);
        const edits = highlights.map(h => TextEdit.replace(h.range, newName));
        return {
            changes: { [document.uri]: edits }
        };
    }
    async resolveModuleReference(ref, documentUri, documentContext) {
        if (startsWith(documentUri, 'file://')) {
            const moduleName = getModuleNameFromPath(ref);
            if (moduleName && moduleName !== '.' && moduleName !== '..') {
                const rootFolderUri = documentContext.resolveReference('/', documentUri);
                const documentFolderUri = dirname(documentUri);
                const modulePath = await this.resolvePathToModule(moduleName, documentFolderUri, rootFolderUri);
                if (modulePath) {
                    const pathWithinModule = ref.substring(moduleName.length + 1);
                    return joinPath(modulePath, pathWithinModule);
                }
            }
        }
        return undefined;
    }
    async mapReference(target, isRawLink) {
        return target;
    }
    async resolveReference(target, documentUri, documentContext, isRawLink = false, settings = this.defaultSettings) {
        // Following [css-loader](https://github.com/webpack-contrib/css-loader#url)
        // and [sass-loader's](https://github.com/webpack-contrib/sass-loader#imports)
        // convention, if an import path starts with ~ then use node module resolution
        // *unless* it starts with "~/" as this refers to the user's home directory.
        if (target[0] === '~' && target[1] !== '/' && this.fileSystemProvider) {
            target = target.substring(1);
            return this.mapReference(await this.resolveModuleReference(target, documentUri, documentContext), isRawLink);
        }
        const ref = await this.mapReference(documentContext.resolveReference(target, documentUri), isRawLink);
        // Following [less-loader](https://github.com/webpack-contrib/less-loader#imports)
        // and [sass-loader's](https://github.com/webpack-contrib/sass-loader#resolving-import-at-rules)
        // new resolving import at-rules (~ is deprecated). The loader will first try to resolve @import as a relative path. If it cannot be resolved,
        // then the loader will try to resolve @import inside node_modules.
        if (this.resolveModuleReferences) {
            if (ref && await this.fileExists(ref)) {
                return ref;
            }
            const moduleReference = await this.mapReference(await this.resolveModuleReference(target, documentUri, documentContext), isRawLink);
            if (moduleReference) {
                return moduleReference;
            }
        }
        // Try resolving the reference from the language configuration alias settings
        if (ref && !(await this.fileExists(ref))) {
            const rootFolderUri = documentContext.resolveReference('/', documentUri);
            if (settings && rootFolderUri) {
                // Specific file reference
                if (target in settings) {
                    return this.mapReference(joinPath(rootFolderUri, settings[target]), isRawLink);
                }
                // Reference folder
                const firstSlash = target.indexOf('/');
                const prefix = `${target.substring(0, firstSlash)}/`;
                if (prefix in settings) {
                    const aliasPath = (settings[prefix]).slice(0, -1);
                    let newPath = joinPath(rootFolderUri, aliasPath);
                    return this.mapReference(newPath = joinPath(newPath, target.substring(prefix.length - 1)), isRawLink);
                }
            }
        }
        // fall back. it might not exists
        return ref;
    }
    async resolvePathToModule(_moduleName, documentFolderUri, rootFolderUri) {
        // resolve the module relative to the document. We can't use `require` here as the code is webpacked.
        const packPath = joinPath(documentFolderUri, 'node_modules', _moduleName, 'package.json');
        if (await this.fileExists(packPath)) {
            return dirname(packPath);
        }
        else if (rootFolderUri && documentFolderUri.startsWith(rootFolderUri) && (documentFolderUri.length !== rootFolderUri.length)) {
            return this.resolvePathToModule(_moduleName, dirname(documentFolderUri), rootFolderUri);
        }
        return undefined;
    }
    async fileExists(uri) {
        if (!this.fileSystemProvider) {
            return false;
        }
        try {
            const stat = await this.fileSystemProvider.stat(uri);
            if (stat.type === FileType.Unknown && stat.size === -1) {
                return false;
            }
            return true;
        }
        catch (err) {
            return false;
        }
    }
}
function getColorInformation(node, document) {
    const color = getColorValue(node);
    if (color) {
        const range = getRange(node, document);
        return { color, range };
    }
    return null;
}
function getRange(node, document) {
    return Range.create(document.positionAt(node.offset), document.positionAt(node.end));
}
/**
 * Test if `otherRange` is in `range`. If the ranges are equal, will return true.
 */
function containsRange(range, otherRange) {
    const otherStartLine = otherRange.start.line, otherEndLine = otherRange.end.line;
    const rangeStartLine = range.start.line, rangeEndLine = range.end.line;
    if (otherStartLine < rangeStartLine || otherEndLine < rangeStartLine) {
        return false;
    }
    if (otherStartLine > rangeEndLine || otherEndLine > rangeEndLine) {
        return false;
    }
    if (otherStartLine === rangeStartLine && otherRange.start.character < range.start.character) {
        return false;
    }
    if (otherEndLine === rangeEndLine && otherRange.end.character > range.end.character) {
        return false;
    }
    return true;
}
function getHighlightKind(node) {
    if (node.type === nodes.NodeType.Selector) {
        return DocumentHighlightKind.Write;
    }
    if (node instanceof nodes.Identifier) {
        if (node.parent && node.parent instanceof nodes.Property) {
            if (node.isCustomProperty) {
                return DocumentHighlightKind.Write;
            }
        }
    }
    if (node.parent) {
        switch (node.parent.type) {
            case nodes.NodeType.FunctionDeclaration:
            case nodes.NodeType.MixinDeclaration:
            case nodes.NodeType.Keyframe:
            case nodes.NodeType.VariableDeclaration:
            case nodes.NodeType.FunctionParameter:
                return DocumentHighlightKind.Write;
        }
    }
    return DocumentHighlightKind.Read;
}
function toTwoDigitHex(n) {
    const r = n.toString(16);
    return r.length !== 2 ? '0' + r : r;
}
function getModuleNameFromPath(path) {
    const firstSlash = path.indexOf('/');
    if (firstSlash === -1) {
        return '';
    }
    // If a scoped module (starts with @) then get up until second instance of '/', or to the end of the string for root-level imports.
    if (path[0] === '@') {
        const secondSlash = path.indexOf('/', firstSlash + 1);
        if (secondSlash === -1) {
            return path;
        }
        return path.substring(0, secondSlash);
    }
    // Otherwise get until first instance of '/'
    return path.substring(0, firstSlash);
}