// The Isomorphic Go Project
// Copyright (c) Wirecog, LLC. All rights reserved.
// Use of this source code is governed by a BSD-style
// license, which can be found in the LICENSE file.

package isokit

import (
	"html/template"
	"io/ioutil"
	"strings"
)

type TemplateSet struct {
	members  map[string]*Template
	Funcs    template.FuncMap
	contents *TemplateSetContents
}

func NewTemplateSet() *TemplateSet {
	return &TemplateSet{
		members: map[string]*Template{},
		Funcs:   template.FuncMap{},
	}
}

func (t *TemplateSet) Members() map[string]*Template {
	return t.members
}

func (t *TemplateSet) Contents() *TemplateSetContents {
	return t.contents
}

func (t *TemplateSet) AddTemplateFile(name, filename string, templateType int8) error {
	contents, err := ioutil.ReadFile(filename)
	if err != nil {
		return err
	}

	tpl, err := template.New(name).Funcs(t.Funcs).Parse(string(contents))
	template := Template{
		Template:     tpl,
		templateType: templateType,
	}

	t.members[tpl.Name()] = &template
	return nil

}

func (t *TemplateSet) MakeAllAssociations() error {

	for _, template := range t.members {

		for _, member := range t.members {

			if member.Lookup(template.NameWithPrefix()) == nil {

				if _, err := member.AddParseTree(template.NameWithPrefix(), template.Tree); err != nil {
					println(err)
					return err
				}
			}

		}

	}
	return nil
}

func (t *TemplateSet) ImportTemplatesFromMap(templateMap map[string]string) error {

	for name, templateContents := range templateMap {

		var templateType int8
		if strings.Contains(name, PrefixNamePartial) {
			templateType = TemplatePartial
		} else if strings.Contains(name, PrefixNameLayout) {
			templateType = TemplateLayout
		} else {
			templateType = TemplateRegular
		}

		tpl, err := template.New(name).Funcs(t.Funcs).Parse(templateContents)

		if err != nil {
			println("Encountered error when attempting to parse template: ", err)

			return err
		}

		tmpl := Template{
			Template:     tpl,
			templateType: templateType,
		}
		t.members[name] = &tmpl

	}
	t.MakeAllAssociations()
	return nil
}

func (t *TemplateSet) RenderMember(templateName string, params *RenderParams) {

	t.Members()[templateName].Render(params)

}

func (t *TemplateSet) GatherTemplates() {

	contents := NewTemplateSetContents()
	contents.importTemplateFileContents()
	t.ImportTemplatesFromMap(contents.Items())
	t.contents = contents

}