using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace System.Net.ApiService {
    public class html_response {

        protected string _title;
        protected string _cacheName = "";
        protected string _template = "main.html";

        protected List<string> _css = new List<string>();
        protected List<string> _headers = new List<string>();
        protected string _innerHtml = "";

        public html_response(string Title) {
            this._title = Title;
        }

        public html_response(string Title, string CacheName) {
            this._title = Title;
            this._cacheName = CacheName;
        }

        public html_response(string Title, string Template, string CacheName) {
            this._title = Title;
            this._template = Template;
            this._cacheName = CacheName;
        }

        public List<string> CSS_Files {
            get {
                return this._css;
            }
        }

        public string InnerHtml {
            get {
                return this._innerHtml;
            }
            set {
                this._innerHtml = value;
            }
        }

        public List<string> HeaderLines {
            get {
                return this._headers;
            }
        }

        public string Title {
            get {
                return this._title;
            }
            set {
                this._title = value;
            }
        }

        public string Template {
            get {
                return this._template;
            }
            set {
                this._template = value;
            }
        }

        public bool AllowCache {
            get {
                return this._cacheName != "";
            }
        }

        public string CacheName {
            get {
                return this._cacheName;
            }
            set {
                this._cacheName = value;
            }
        }

        public override string ToString() {
            return this.getHtml();
        }

        protected string getHtml() {
            if (Directory.Exists("cache/") && this.AllowCache && File.Exists("cache/" + this._cacheName)) {
                System.Diagnostics.Debug.WriteLine("Read from Cache: 'cache/" + this._cacheName);
                return File.ReadAllText("cache/" + this._cacheName);
            }
            System.Diagnostics.Debug.WriteLine("Get Template");
            string res = this.getTemplate();

            res = res.Replace("{title}", this._title);
            res = res.Replace("{header}", this.getHeader());
            res = res.Replace("{message}", this.getBody());

            if (this.AllowCache) {
                File.WriteAllText("cache/" + this._cacheName, res);
            }
            return res;
        }

        protected string getBody() {
            return this._innerHtml;
        }

        protected string getHeader() {
            string res = "";
            res += this.getCSS();
            res += this.getHeaderLines();
            return res;
        }

        protected string getCSS() {
            string res = "";
            if (this._css.Count > 0) {
                foreach (string s in this._css) {
                    res += "    <link src='css/" + s + "' type='text/css'>\n";
                }
            }
            return res;
        }

        protected string getHeaderLines() {
            string res = "";
            if (this._css.Count > 0) {
                foreach (string s in this._headers) {
                    res += "    "+s+"\n";
                }
            }
            return res;
        }

        protected string getTemplate() {
            if (Directory.Exists("template/") && File.Exists("template/" + this._template) && this._template != "") {
                return File.ReadAllText("template/" + this._template);
            }
            return "<!DOCTYPE html>\n" +
                "<head><title>{title}</title>{header}</head><body>{message}</body></html>";
        }
    }
}