var Immutable = require('immutable');

var TemplateBlock = require('./templateBlock');
var PluginDependency = require('./pluginDependency');
var THEME_PREFIX = require('../constants/themePrefix');

var DEFAULT_VERSION = '*';

var Plugin = Immutable.Record({
    name:       String(),

    // Requirement version (ex: ">1.0.0")
    version:    String(DEFAULT_VERSION),

    // Path to load this plugin
    path:       String(),

    // Depth of this plugin in the dependency tree
    depth:      Number(0),

    // Parent depending on this plugin
    parent:     String(),

    // Content of the "package.json"
    package:    Immutable.Map(),

    // Content of the package itself
    content:    Immutable.Map()
}, 'Plugin');

Plugin.prototype.getName = function() {
    return this.get('name');
};

Plugin.prototype.getPath = function() {
    return this.get('path');
};

Plugin.prototype.getVersion = function() {
    return this.get('version');
};

Plugin.prototype.getPackage = function() {
    return this.get('package');
};

Plugin.prototype.getContent = function() {
    return this.get('content');
};

Plugin.prototype.getDepth = function() {
    return this.get('depth');
};

Plugin.prototype.getParent = function() {
    return this.get('parent');
};

/**
 * Return the ID on NPM for this plugin
 * @return {String}
 */
Plugin.prototype.getNpmID = function() {
    return PluginDependency.nameToNpmID(this.getName());
};

/**
 * Check if a plugin is loaded
 * @return {Boolean}
 */
Plugin.prototype.isLoaded = function() {
    return Boolean(this.getPackage().size > 0);
};

/**
 * Check if a plugin is a theme given its name
 * @return {Boolean}
 */
Plugin.prototype.isTheme = function() {
    var name = this.getName();
    return (name && name.indexOf(THEME_PREFIX) === 0);
};

/**
 * Return map of hooks
 * @return {Map<String:Function>}
 */
Plugin.prototype.getHooks = function() {
    return this.getContent().get('hooks') || Immutable.Map();
};

/**
 * Return infos about resources for a specific type
 * @param {String} type
 * @return {Map<String:Mixed>}
 */
Plugin.prototype.getResources = function(type) {
    if (type != 'website' && type != 'ebook') {
        throw new Error('Invalid assets type ' + type);
    }

    var content = this.getContent();
    return (content.get(type)
        || (type == 'website'? content.get('book') : null)
        || Immutable.Map());
};

/**
 * Return map of filters
 * @return {Map<String:Function>}
 */
Plugin.prototype.getFilters = function() {
    return this.getContent().get('filters');
};

/**
 * Return map of blocks
 * @return {Map<String:TemplateBlock>}
 */
Plugin.prototype.getBlocks = function() {
    var blocks = this.getContent().get('blocks');
    blocks = blocks || Immutable.Map();

    return blocks
        .map(function(block, blockName) {
            return TemplateBlock.create(blockName, block);
        });
};

/**
 * Return a specific hook
 * @param {String} name
 * @return {Function|undefined}
 */
Plugin.prototype.getHook = function(name) {
    return this.getHooks().get(name);
};

/**
 * Create a plugin from a string
 * @param {String}
 * @return {Plugin}
 */
Plugin.createFromString = function(s) {
    var parts = s.split('@');
    var name = parts[0];
    var version = parts.slice(1).join('@');

    return new Plugin({
        name: name,
        version: version || DEFAULT_VERSION
    });
};

/**
 * Create a plugin from a dependency
 * @param {PluginDependency}
 * @return {Plugin}
 */
Plugin.createFromDep = function(dep) {
    return new Plugin({
        name: dep.getName(),
        version: dep.getVersion()
    });
};

Plugin.nameToNpmID = PluginDependency.nameToNpmID;

module.exports = Plugin;