package main

import (
	"encoding/json"
	"flag"
	"fmt"
	"os"

	"github.com/iancoleman/orderedmap"
)

type TestDefinitions struct {
	Name      string            `json:"name"`
	TestCases []TestCase        `json:"testCases"`
	BaseUrl   string            `json:"url"`
	Headers   map[string]string // Need to initialise with make
	//Header    HeaderOptions `json:"header"`
}

type TestCase struct {
	Name        string
	Path        string        `json:"path"`
	Method      string        `json:"method"`
	Description string        `json:"description"`
	Expect      ExpectOptions `json:"expect"`
}

type ExpectOptions struct {
	Header HeaderOptions `json:"header"`
	Body   BodyOptions   `json:"body"`
}

type HeaderOptions struct {
	Contains ContainsTest `json:"contains"`
	Equals   EqualsTest   `json:"equals"`
}

type BodyOptions struct {
	Contains     ContainsTest     `json:"contains"`
	Equals       EqualsTest       `json:"equals"`
	HasKeys      HasKeysTest      `json:"hasKeys"`
	PathEq       PathEqTest       `json:"pathEq"`
	PathContains PathContainsTest `json:"pathContains"`
}

// Test types
type ContainsTest struct {
	// dynamically specified key value pairs
}

type EqualsTest struct {
	// dynamically specified key value pairs
}

type HasKeysTest struct {
	// dynamically specified key value pairs
}

type PathEqTest struct {
	// dynamically specified key value pairs
}

type PathContainsTest struct {
	// dynamically specified key value pairs
}

// fileExists returns true if the specified file exists and is not a directory
func fileExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

func PerformGet() {

}

func PerformPost() {

}

func TestOutput() {

}

func main() {
	var s []byte
	var err error
	var ok bool

	// Prepare struct to store settings common to all tests
	testDefinitions := new(TestDefinitions)
	testDefinitions.Headers = make(map[string]string)

	//testCaseDefinition := new(InputData)

	// Command line arguments
	var inputJson string

	// Process command line arguments
	flag.StringVar(&inputJson, "input", "./tests.json", "Full path to input json test definition file")

	// Read the json input file
	if fileExists(inputJson) {
		s, err = os.ReadFile(inputJson)
		if err != nil {
			panic(err)
		}
	} else {
		fmt.Printf("Input JSON file '%s' does not exist.\n", inputJson)
		os.Exit(1)
	}

	// Unmarshal the json into an orderedmap to preserve the ordering of json structure
	o := orderedmap.New()
	err = json.Unmarshal([]byte(s), &o)
	if err != nil {
		error := fmt.Sprintf("JSON Unmarshal error %s\n", err)
		panic(error)
	}

	topLevel := o.Keys()
	fmt.Printf("Found %d top-level keys in json data\n", len(topLevel))
	/*
		for i, key := range topLevel {
			fmt.Printf("[%d] : %s\n", i, key)
		}
	*/

	// TODO : Check required top level keys are present
	if len(topLevel) <= 1 {
		error := "Missing required keys in input json"
		panic(error)
	}

	// Get the name of the group of tests
	if data, ok := o.Get("name"); ok {
		testDefinitions.Name = data.(string)
		fmt.Printf("test name: '%s'\n", testDefinitions.Name)
	}

	// Get a reference to the node containing each of the test cases
	testsInterface, ok := o.Get("testCases")
	if !ok {
		fmt.Printf("No key defining test cases found\n")
	}

	/*
		// Test Cases is an array, need to go one level down before we start looking at key/values
		vs := testsInterface.([]interface{})
		fmt.Printf("Listing %d test definitions\n", len(vs))
		for i, vInterface := range vs {
			v := vInterface.(orderedmap.OrderedMap)
			keys := v.Keys()
			fmt.Printf("Test %d\n", i)
			for j := range keys {
				fmt.Printf("[%d] : %s\n", j, keys[j])
			}
		}
	*/

	/*
		vslice := testsInterface.([]interface{})
		vmap := vslice[2].(orderedmap.OrderedMap)
		k := vmap.Keys()
		for i := range k {
			fmt.Printf("[%d] : %s\n", i, k[i])
		}
		return
	*/

	// Get the keys for the first test so we know what config options have been specified
	testCasesMap := testsInterface.(orderedmap.OrderedMap)
	testCasesKeys := testCasesMap.Keys()

	// Parse json into our testCaseDefinition

	// Parse each key into our config struct
	fmt.Printf("Listing %d test cases\n", len(testCasesKeys))
	for i, outerKey := range testCasesKeys {

		fmt.Printf("Test %d : %s\n", i, outerKey)

		thisTestCase := new(TestCase)
		thisTestCase.Name = outerKey

		if testCase, ok := testCasesMap.Get(outerKey); ok {

			// Get the details of the test case
			thisTestCaseMap := testCase.(orderedmap.OrderedMap)

			// Path
			if val, ok := thisTestCaseMap.Get("path"); ok {
				thisTestCase.Path = val.(string)
			}
			// Method
			if val, ok := thisTestCaseMap.Get("method"); ok {
				thisTestCase.Method = val.(string)
			}
			// Description
			if val, ok := thisTestCaseMap.Get("description"); ok {
				thisTestCase.Description = val.(string)
			}
			// Expect - this is more tricky since it is yet another json fragment

			/*
				for j, key := range thisTestCaseMap.Keys() {
					val, _ := thisTestCaseMap.Get(key)

					fmt.Printf("[%d] %s : %s\n", j, key, val)
				}
			*/
		}

		testDefinitions.TestCases = append(testDefinitions.TestCases, *thisTestCase)
	}

	// For debugging, just dump the output
	fmt.Printf("%+v\n", testDefinitions)
}