package sync

import (
	"path"

	"github.com/BurntSushi/toml"
)

// ExerciceHintParams holds EHint definition infomation.
type ExerciceHintParams struct {
	Filename string
	Content  string
	Cost     int64
	Title    string
}

// ExerciceDependency holds dependency definitions information.
type ExerciceDependency struct {
	Id    int64
	Theme string `toml:",omitempty"`
}

// ExerciceUnlockFile holds parameters related to a locked file.
type ExerciceUnlockFile struct {
	Filename string `toml:",omitempty"`
}

// ExerciceFlag holds informations about a "classic" flag.
type ExerciceFlag struct {
	Id          int64
	Label       string               `toml:",omitempty"`
	Raw         interface{}
	Separator   string               `toml:",omitempty"`
	Ordered     bool                 `toml:",omitempty"`
	IgnoreCase  bool                 `toml:",omitempty"`
	ValidatorRe string               `toml:"validator_regexp,omitempty"`
	Help        string               `toml:",omitempty"`
	LockedFile  []ExerciceUnlockFile `toml:"unlock_file,omitempty"`
	NeedFlag    []ExerciceDependency `toml:"need_flag,omitempty"`
}

// ExerciceFlagMCQChoice holds a choice for an MCQ flag.
type ExerciceFlagMCQChoice struct {
	Label string
	Value interface{} `toml:",omitempty"`
	Help  string      `toml:",omitempty"`
}

// ExerciceFlagMCQ holds information about a MCQ flag.
type ExerciceFlagMCQ struct {
	Label     string `toml:",omitempty"`
	Choice    []ExerciceFlagMCQChoice
	NoShuffle bool
}

// ExerciceFlagUCQChoice holds a choice for an UCQ flag.
type ExerciceFlagUCQChoice struct {
	Label string `toml:",omitempty"`
	Value string
}

// ExerciceFlagUCQ holds information about a UCQ flag.
type ExerciceFlagUCQ struct {
	Id          int64
	Label        string `toml:",omitempty"`
	Raw          string
	IgnoreCase   bool   `toml:",omitempty"`
	ValidatorRe  string `toml:"validator_regexp,omitempty"`
	Help         string `toml:",omitempty"`
	DisplayAs    string `toml:",omitempty"`
	ChoicesCost  int64  `toml:"choices_cost,omitempty"`
	Choice       []ExerciceFlagUCQChoice
	LockedFile   []ExerciceUnlockFile `toml:"unlock_file,omitempty"`
	NeedFlag     []ExerciceDependency `toml:"need_flag,omitempty"`
	NoShuffle    bool
}

// ExerciceParams contains values parsed from defines.txt.
type ExerciceParams struct {
	Gain         int64
	Tags         []string
	Hints        []ExerciceHintParams `toml:"hint"`
	Dependencies []ExerciceDependency `toml:"depend"`
	Flags        []ExerciceFlag       `toml:"flag"`
	FlagsMCQ     []ExerciceFlagMCQ    `toml:"flag_mcq"`
	FlagsUCQ     []ExerciceFlagUCQ    `toml:"flag_ucq"`
}

// parseExerciceParams reads challenge definitions from defines.txt and extract usefull data to set up the challenge.
func parseExerciceParams(i Importer, exPath string) (p ExerciceParams, err error) {
	var defs string
	defs, err = getFileContent(i, path.Join(exPath, "challenge.txt"))

	_, err = toml.Decode(defs, &p)

	return
}