package modules

import (
	_ "embed"
	"fmt"
	"os"
	"sort"
	"strings"

	"git.frostfs.info/TrueCloudLab/s3-tests-parser/internal/parser"
	"git.frostfs.info/TrueCloudLab/s3-tests-parser/internal/s3"
	"git.frostfs.info/TrueCloudLab/s3-tests-parser/internal/templates"
	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var compatibilityCmd = &cobra.Command{
	Use:   "compatibility",
	Short: "Shows compatibility results",
	Long:  "Form compatibility table based on passed s3 tests",
	Example: `s3-tests-parser compatibility suite.csv
s3-tests-parser compatibility suite.json --format json
s3-tests-parser compatibility suite.json --format json --output-format md
s3-tests-parser compatibility suite.json --format json --output-format md --output result.md`,
	RunE: runCompatibilityCmd,
}

type (
	Results struct {
		Legend    []Status
		TagGroups []TagGroup
	}

	TagGroup struct {
		Name  string
		Tests []TestResult
	}

	Status struct {
		Color       string
		Description string
	}

	TestResult struct {
		Color   string
		Name    string
		Comment string
		Passed  int
		Total   int
	}
)

const (
	formatFlag       = "format"
	outputFlag       = "output"
	outputFormatFlag = "output-format"
)

func initCompatibilityCmd() {
	compatibilityCmd.Flags().String(formatFlag, "csv", "format of input test suite file")
	compatibilityCmd.Flags().String(outputFlag, "", "file to write output, if missed the stdout is used")
	compatibilityCmd.Flags().String(outputFormatFlag, "txt", "format of output")
}

func runCompatibilityCmd(cmd *cobra.Command, args []string) error {
	if len(args) != 1 {
		return fmt.Errorf("expected exactly one arg, got: %v", args)
	}

	testStruct, err := s3.ParseTestsStruct()
	if err != nil {
		return err
	}

	testsMap, err := parser.ParseSuite(args[0], viper.GetString(formatFlag))
	if err != nil {
		return fmt.Errorf("parse tests: %w", err)
	}

	res := formResults(testStruct, testsMap)
	return printResults(cmd, res)
}

var legend = []Status{
	{
		Color:       templates.GreenColor,
		Description: "Supported",
	},
	{
		Color:       templates.YellowColor,
		Description: "Partially supported",
	},
	{
		Color:       templates.RedColor,
		Description: "Badly supported",
	},
	{
		Color:       templates.BlueColor,
		Description: "Not supported yet, but will be in future",
	},
	{
		Color:       templates.BlackColor,
		Description: "Not applicable or will never be supported",
	},
}

func formResults(testStruct s3.TestsStructure, testsMap map[string]bool) Results {
	tagGroups := make(map[string]TagGroup)
	for _, group := range testStruct.Groups {
		tagGroup, ok := tagGroups[group.Tag]
		if !ok {
			tagGroup.Name = group.Tag
		}

		tagGroup.Tests = append(tagGroup.Tests, formTestResult(group, testsMap))
		tagGroups[group.Tag] = tagGroup
	}

	res := Results{Legend: legend}
	for _, group := range tagGroups {
		res.TagGroups = append(res.TagGroups, group)
	}

	sort.Slice(res.TagGroups, func(i, j int) bool {
		return res.TagGroups[i].Name < res.TagGroups[j].Name
	})

	return res
}

func formTestResult(group s3.Group, testsMap map[string]bool) TestResult {
	ln := len(group.Tests)
	pass := 0

	for _, test := range group.Tests {
		if testsMap[test] {
			pass++
		}
	}

	var color string
	if strings.Contains(group.Comment, "Not supported yet") {
		color = templates.BlueColor
	} else if strings.Contains(group.Comment, "Not applicable") {
		color = templates.BlackColor
	}

	if color == "" {
		color = templates.RedColor
		rate := float64(pass) / float64(ln)
		if rate > 0.9 {
			color = templates.GreenColor
		} else if rate > 0.5 {
			color = templates.YellowColor
		}
	}

	return TestResult{
		Color:   color,
		Name:    group.Name,
		Comment: group.Comment,
		Passed:  pass,
		Total:   ln,
	}
}

func printResults(cmd *cobra.Command, res Results) error {
	w := cmd.OutOrStdout()
	if outFile := viper.GetString(outputFlag); outFile != "" {
		f, err := os.Create(outFile)
		if err != nil {
			return fmt.Errorf("create out file: %w", err)
		}
		w = f
		defer f.Close()
	}

	outTemplate, err := templates.GetTemplate(viper.GetString(outputFormatFlag))
	if err != nil {
		return fmt.Errorf("form out template: %w", err)
	}

	return outTemplate.Execute(w, res)
}