var cordova_util  = require('./util'),
    util          = require('util'),
    fs            = require('fs'),
    shell         = require('shelljs'),
    path          = require('path'),
    shell         = require('shelljs'),
    config_parser = require('./config_parser'),
    hooker        = require('./hooker'),
    platform      = require('./platform'),
    plugin_parser = require('./plugin_parser'),
    ls            = fs.readdirSync;

module.exports = function plugin(command, targets, callback) {
    var projectRoot = cordova_util.isCordova(process.cwd());

    if (!projectRoot) {
        throw 'Current working directory is not a Cordova-based project.';
    }
    if (arguments.length === 0) command = 'ls';

    var hooks = new hooker(projectRoot);

    var projectWww = path.join(projectRoot, 'www');

    // Grab config info for the project
    var xml = path.join(projectWww, 'config.xml');
    var cfg = new config_parser(xml);
    var platforms = ls(path.join(projectRoot, 'platforms'));

    // Massage plugin name(s) / path(s)
    var pluginPath, plugins, names = [];
    pluginPath = path.join(projectRoot, 'plugins');
    plugins = ls(pluginPath);
    if (targets) { 
        if (!(targets instanceof Array)) targets = [targets];
        targets.forEach(function(target) {
            var targetName = target.substr(target.lastIndexOf('/') + 1);
            if (targetName[targetName.length-1] == '/') targetName = targetName.substr(0, targetName.length-1);
            names.push(targetName);
        });
    }

    switch(command) {
        case 'ls':
        case 'list':
            // TODO awkward before+after hooks here
            hooks.fire('before_plugin_ls');
            hooks.fire('after_plugin_ls');
            if (plugins.length) {
                return plugins;
            } else return 'No plugins added. Use `cordova plugin add <plugin>`.';
            break;
        case 'add':
            if (platforms.length === 0) {
                throw 'You need at least one platform added to your app. Use `cordova platform add <platform>`.';
            }
            targets.forEach(function(target, index) {
                var pluginContents = ls(target);
                var targetName = names[index];
                // Check if we already have the plugin.
                // TODO edge case: if a new platform is added, then you want
                // to re-add the plugin to the new platform.
                if (plugins.indexOf(targetName) > -1) {
                    throw 'Plugin "' + targetName + '" already added to project.';
                }
                // Check if the plugin has a plugin.xml in the root of the
                // specified dir.
                if (pluginContents.indexOf('plugin.xml') == -1) {
                    throw 'Plugin "' + targetName + '" does not have a plugin.xml in the root. Plugin must support the Cordova Plugin Specification: https://github.com/alunny/cordova-plugin-spec';
                }

                // Check if there is at least one match between plugin
                // supported platforms and app platforms
                var pluginXml = new plugin_parser(path.join(target, 'plugin.xml'));
                var intersection = pluginXml.platforms.filter(function(e) {
                    if (platforms.indexOf(e) == -1) return false;
                    else return true;
                });
                if (intersection.length === 0) {
                    throw 'Plugin "' + targetName + '" does not support any of your application\'s platforms. Plugin platforms: ' + pluginXml.platforms.join(', ') + '; your application\'s platforms: ' + platforms.join(', ');
                }

                hooks.fire('before_plugin_add');

                var pluginWww = path.join(target, 'www');
                var wwwContents = ls(pluginWww);
                var cli = path.join(__dirname, '..', 'node_modules', 'plugman', 'plugman.js');

                // Iterate over all matchin app-plugin platforms in the project and install the
                // plugin.
                intersection.forEach(function(platform) {
                    var cmd = util.format('%s --platform %s --project "%s" --plugin "%s"', cli, platform, path.join(projectRoot, 'platforms', platform), target);
                    var plugin_cli = shell.exec(cmd, {silent:true});
                    if (plugin_cli.code > 0) throw 'An error occured during plugin installation for ' + platform + '. ' + plugin_cli.output;
                });
                
                // Add the plugin web assets to the www folder as well
                // TODO: assumption that web assets go under www folder
                // inside plugin dir; instead should read plugin.xml
                wwwContents.forEach(function(asset) {
                    asset = path.resolve(path.join(pluginWww, asset));
                    var info = fs.lstatSync(asset);
                    var name = asset.substr(asset.lastIndexOf('/')+1);
                    var wwwPath = path.join(projectWww, name);
                    if (info.isDirectory()) {
                        shell.cp('-r', asset, projectWww);
                    } else {
                        fs.writeFileSync(wwwPath, fs.readFileSync(asset));
                    }
                });

                // Finally copy the plugin into the project
                var targetPath = path.join(pluginPath, targetName);
                shell.mkdir('-p', targetPath);
                shell.cp('-r', path.join(target, '*'), targetPath);

                hooks.fire('after_plugin_add');
            });
            if (callback) callback();
            break;
        case 'rm':
        case 'remove':
            if (platforms.length === 0) {
                throw 'You need at least one platform added to your app. Use `cordova platform add <platform>`.';
            }
            targets.forEach(function(target, index) {
                var targetName = names[index];
                // Check if we have the plugin.
                if (plugins.indexOf(targetName) > -1) {
                    var targetPath = path.join(pluginPath, targetName);
                    hooks.fire('before_plugin_rm');
                    var pluginWww = path.join(targetPath, 'www');
                    var wwwContents = ls(pluginWww);
                    var cli = path.join(__dirname, '..', 'node_modules', 'plugman', 'plugman.js');

                    // Check if there is at least one match between plugin
                    // supported platforms and app platforms
                    var pluginXml = new plugin_parser(path.join(targetPath, 'plugin.xml'));
                    var intersection = pluginXml.platforms.filter(function(e) {
                        if (platforms.indexOf(e) == -1) return false;
                        else return true;
                    });

                    // Iterate over all matchin app-plugin platforms in the project and uninstall the
                    // plugin.
                    intersection.forEach(function(platform) {
                        var cmd = util.format('%s --platform %s --project "%s" --plugin "%s" --remove', cli, platform, path.join(projectRoot, 'platforms', platform), targetPath);
                        var plugin_cli = shell.exec(cmd, {silent:true});
                        if (plugin_cli.code > 0) throw 'An error occured during plugin uninstallation for ' + platform + '. ' + plugin_cli.output;
                    });
                    
                    // Remove the plugin web assets to the www folder as well
                    // TODO: assumption that web assets go under www folder
                    // inside plugin dir; instead should read plugin.xml
                    wwwContents.forEach(function(asset) {
                        asset = path.resolve(path.join(projectWww, asset));
                        var info = fs.lstatSync(asset);
                        if (info.isDirectory()) {
                            shell.rm('-rf', asset);
                        } else {
                            fs.unlinkSync(asset);
                        }
                    });

                    // Finally remove the plugin dir from plugins/
                    shell.rm('-rf', targetPath);

                    hooks.fire('after_plugin_rm');
                } else {
                    throw 'Plugin "' + targetName + '" not added to project.';
                }
            });
            if (callback) callback();
            break;
        default:
            throw 'Unrecognized command "' + command + '". Use either `add`, `remove`, or `list`.';
    }
};