package main

import (
	"fmt"
	"log/slog"
	"os"
	"regexp"
	"strconv"
	"strings"

	"focs.ji.sjtu.edu.cn/git/FOCS-dev/JOJ3/internal/stage"
	"github.com/go-git/go-git/v5"
	"github.com/koding/multiconfig"
)

type JobType int

const (
	HC JobType = iota
	CQ
	OJ
)

type Conf struct {
	SandboxExecServer string `default:"localhost:5051"`
	SandboxToken      string `default:""`
	LogLevel          int    `default:"0"`
	OutputPath        string `default:"joj3_result.json"`
	Stages            []struct {
		Name     string
		Executor struct {
			Name string
			With struct {
				Default stage.Cmd
				Cases   []OptionalCmd
			}
		}
		Parser struct {
			Name string
			With interface{}
		}
	}
}

type OptionalCmd struct {
	Args   *[]string
	Env    *[]string
	Stdin  *stage.CmdFile
	Stdout *stage.CmdFile
	Stderr *stage.CmdFile

	CPULimit     *uint64
	RealCPULimit *uint64
	ClockLimit   *uint64
	MemoryLimit  *uint64
	StackLimit   *uint64
	ProcLimit    *uint64
	CPURateLimit *uint64
	CPUSetLimit  *string

	CopyIn       *map[string]stage.CmdFile
	CopyInCached *map[string]string
	CopyInCwd    *bool

	CopyOut       *[]string
	CopyOutCached *[]string
	CopyOutMax    *uint64
	CopyOutDir    *string

	TTY               *bool
	StrictMemoryLimit *bool
	DataSegmentLimit  *bool
	AddressSpaceLimit *bool
}

func parseConfFile(path string) (conf Conf, err error) {
	d := &multiconfig.DefaultLoader{}
	d.Loader = multiconfig.MultiLoader(
		&multiconfig.TagLoader{},
		&multiconfig.JSONLoader{Path: path},
	)
	d.Validator = multiconfig.MultiValidator(&multiconfig.RequiredValidator{})
	if err = d.Load(&conf); err != nil {
		slog.Error("parse stages conf", "error", err)
		return
	}
	if err = d.Validate(&conf); err != nil {
		slog.Error("validate stages conf", "error", err)
		return
	}
	return
}

func _validateHw(hw string) error {
	matched, err := regexp.MatchString(`^hw[0-9]+$`, hw)
	if err != nil {
		return fmt.Errorf("error compiling regex: %w", err)
	}
	if !matched {
		return fmt.Errorf("error: hw does not match the required pattern")
	}
	return nil
}

func _getExList(pattern string) (hwList []string, err error) {
	re, err := regexp.Compile(pattern)
	if err != nil {
		return nil, fmt.Errorf("failed to compile regex: %w", err)
	}

	files, err := os.ReadDir(".")
	if err != nil {
		return nil, fmt.Errorf("error reading directory: %w", err)
	}

	for _, file := range files {
		if !file.IsDir() && re.MatchString(file.Name()) {
			hwList = append(hwList, file.Name())
		}
	}

	return hwList, nil
}

func _contains(list []string, item string) bool {
	for _, v := range list {
		if v == item {
			return true
		}
	}
	return false
}

func commitMsgToConf() (confs []Conf, jobtype JobType, err error) {
	r, err := git.PlainOpen(".")
	if err != nil {
		return
	}

	ref, err := r.Head()
	if err != nil {
		return
	}

	commit, err := r.CommitObject(ref.Hash())
	if err != nil {
		return
	}

	var conf Conf
	var exList []string
	jobtype = HC
	file := "conf.json"

	msg := commit.Message
	slog.Debug("commit msg to conf", "msg", msg)

	// INFO: default config
	conf, err = parseConfFile(file)
	confs = append(confs, conf)
	if msg == "" {
		return
	}

	line := strings.Split(msg, "\n")[0]
	words := strings.Fields(line)
	head := words[0]

	var hw string

	// INFO: get worktype
	if strings.HasSuffix(head, ":") || strings.HasSuffix(head, ".") {
		head = head[:len(head)-1]
	}
	switch head {
	case "feat", "fix", "refactor", "perf", "test", "build", "revert":
		jobtype = CQ
	case "joj", "grading":
		jobtype = OJ
	}

	// INFO: get configs
	if len(words) >= 2 {
		hw = words[1]
		if err = _validateHw(hw); err == nil {
			file = strings.Replace(file, "conf", "conf-"+hw, 1)
		}
		var exTot []string

		// INFO: get all hw ex if no args provided
		exTot, err = _getExList(file)
		if len(words) == 2 {
			exList = exTot
		} else {
			var tmpList []string
			for idx := 2; idx < len(words); idx++ {
				word := words[idx]
				num, err := strconv.Atoi(word)
				if err != nil {
					return confs, HC, fmt.Errorf("error: bad ex number")
				}
				file := fmt.Sprintf("conf-"+hw+"-ex%d.json", num)
				if !_contains(exList, file) {
					return confs, HC, fmt.Errorf("error: bad ex number")
				}
				tmpList = append(tmpList, file)
			}
			exList = tmpList
		}
	}

	for _, ex := range exList {
		conf, err = parseConfFile(ex)
		if err != nil {
			return
		}
		confs = append(confs, conf)
	}

	return
}