/*
Copyright 2021 The terraform-docs Authors.

Licensed under the MIT license (the "License"); you may not
use this file except in compliance with the License.

You may obtain a copy of the License at the LICENSE file in
the root directory of this source tree.
*/

package format

import (
	"io/ioutil"
	"path/filepath"
	"testing"

	"github.com/stretchr/testify/assert"

	"github.com/terraform-docs/terraform-docs/print"
	"github.com/terraform-docs/terraform-docs/terraform"
)

func TestExecuteTemplate(t *testing.T) {
	header := "this is the header"
	footer := "this is the footer"
	tests := map[string]struct {
		complex  bool
		content  string
		template string
		expected string
		wantErr  bool
	}{
		"Compatible without template": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "",
			expected: "this is the header\nthis is the footer",
			wantErr:  false,
		},
		"Compatible with template not empty section": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "{{ .Header }}",
			expected: "this is the header",
			wantErr:  false,
		},
		"Compatible with template empty section": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "{{ .Inputs }}",
			expected: "",
			wantErr:  false,
		},
		"Compatible with template and unknown section": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "{{ .Unknown }}",
			expected: "",
			wantErr:  true,
		},
		"Compatible with template include file": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "{{ include \"testdata/generator/sample-file.txt\" }}",
			expected: "Sample file to be included.",
			wantErr:  false,
		},
		"Compatible with template include unknown file": {
			complex:  true,
			content:  "this is the header\nthis is the footer",
			template: "{{ include \"file-not-found\" }}",
			expected: "",
			wantErr:  true,
		},
		"Incompatible without template": {
			complex:  false,
			content:  "header: \"this is the header\"\nfooter: \"this is the footer\"",
			template: "",
			expected: "header: \"this is the header\"\nfooter: \"this is the footer\"",
			wantErr:  false,
		},
		"Incompatible with template": {
			complex:  false,
			content:  "header: \"this is the header\"\nfooter: \"this is the footer\"",
			template: "{{ .Header }}",
			expected: "header: \"this is the header\"\nfooter: \"this is the footer\"",
			wantErr:  false,
		},
	}
	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			assert := assert.New(t)

			config := print.DefaultConfig()

			generator := newGenerator(config, tt.complex)
			generator.content = tt.content
			generator.header = header
			generator.footer = footer

			actual, err := generator.Render(tt.template)

			if tt.wantErr {
				assert.NotNil(err)
			} else {
				assert.Nil(err)
				assert.Equal(tt.expected, actual)
			}
		})
	}
}

func TestGeneratorFunc(t *testing.T) {
	text := "foo"
	tests := map[string]struct {
		fn     func(string) generateFunc
		actual func(*generator) string
	}{
		"withContent": {
			fn:     withContent,
			actual: func(r *generator) string { return r.content },
		},
		"withHeader": {
			fn:     withHeader,
			actual: func(r *generator) string { return r.header },
		},
		"withFooter": {
			fn:     withFooter,
			actual: func(r *generator) string { return r.footer },
		},
		"withInputs": {
			fn:     withInputs,
			actual: func(r *generator) string { return r.inputs },
		},
		"withModules": {
			fn:     withModules,
			actual: func(r *generator) string { return r.modules },
		},
		"withOutputs": {
			fn:     withOutputs,
			actual: func(r *generator) string { return r.outputs },
		},
		"withProviders": {
			fn:     withProviders,
			actual: func(r *generator) string { return r.providers },
		},
		"withRequirements": {
			fn:     withRequirements,
			actual: func(r *generator) string { return r.requirements },
		},
		"withResources": {
			fn:     withResources,
			actual: func(r *generator) string { return r.resources },
		},
	}
	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			assert := assert.New(t)

			config := print.DefaultConfig()
			config.Sections.Footer = true

			generator := newGenerator(config, false, tt.fn(text))

			assert.Equal(text, tt.actual(generator))
		})
	}
}

func TestGeneratorFuncModule(t *testing.T) {
	t.Run("withModule", func(t *testing.T) {
		assert := assert.New(t)

		config := print.DefaultConfig()
		config.ModuleRoot = filepath.Join("..", "terraform", "testdata", "full-example")

		module, err := terraform.LoadWithOptions(config)

		assert.Nil(err)

		generator := newGenerator(config, true, withModule(module))

		path := filepath.Join("..", "terraform", "testdata", "expected", "full-example-mainTf-Header.golden")
		data, err := ioutil.ReadFile(path)

		assert.Nil(err)

		expected := string(data)

		assert.Equal(expected, generator.module.Header)
		assert.Equal("", generator.module.Footer)
		assert.Equal(7, len(generator.module.Inputs))
		assert.Equal(3, len(generator.module.Outputs))
	})
}

func TestForEach(t *testing.T) {
	config := print.DefaultConfig()

	generator := newGenerator(config, false)
	generator.forEach(func(name string) (string, error) {
		return name, nil
	})

	tests := map[string]struct {
		actual string
	}{
		"all":          {actual: generator.content},
		"header":       {actual: generator.header},
		"footer":       {actual: generator.footer},
		"inputs":       {actual: generator.inputs},
		"modules":      {actual: generator.modules},
		"outputs":      {actual: generator.outputs},
		"providers":    {actual: generator.providers},
		"requirements": {actual: generator.requirements},
		"resources":    {actual: generator.resources},
	}
	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			assert := assert.New(t)
			assert.Equal(name, tt.actual)
		})
	}
}