package cobra

import (
	"fmt"

	commandmeta "go.maximumdirect.net/commandkit/internal/commandmeta"
)

func interpretFlagTokens(argv []string, flags []commandmeta.Flag, aliases []commandmeta.FlagAlias) ([]string, map[string][]string, []commandmeta.FlagOccurrence, *commandmeta.Failure) {
	lookup := commandmeta.NewFlagLookup(flags, aliases)

	spellings := make(map[string][]string)
	var occurrences []commandmeta.FlagOccurrence
	var interpreted []string
	for index := 0; index < len(argv); {
		token := argv[index]
		kind := commandmeta.ClassifyFlagToken(token)
		if kind == commandmeta.TerminatorToken {
			interpreted = append(interpreted, argv[index:]...)
			break
		}
		if kind == commandmeta.LongFlagToken || kind == commandmeta.ShortFlagToken {
			offset := 1
			consumedNext := false
			for {
				fact := commandmeta.ConsumeFlag(lookup, token, offset)
				if !fact.Found {
					if kind == commandmeta.ShortFlagToken {
						interpreted = append(interpreted, "-"+token[offset:])
					} else {
						interpreted = append(interpreted, token)
					}
					return interpreted, spellings, occurrences, nil
				}
				flag, original := fact.Flag, fact.Spelling
				spellings[flag.Name] = append(spellings[flag.Name], original)
				value := fact.Value
				if fact.NeedsNext {
					if index+1 >= len(argv) {
						return interpreted, spellings, occurrences, &commandmeta.Failure{Message: fmt.Sprintf("flag needs an argument: %s", original)}
					}
					value = argv[index+1]
					consumedNext = true
				}
				if !fact.Attached && !fact.NeedsNext {
					value = "true"
					interpreted = append(interpreted, "--"+flag.Name)
				} else {
					interpreted = append(interpreted, "--"+flag.Name+"="+value)
				}
				occurrences = append(occurrences, commandmeta.FlagOccurrence{Name: flag.Name, Spelling: original, RawValue: value})
				if fact.NextOffset == 0 {
					break
				}
				offset = fact.NextOffset
			}
			index++
			if consumedNext {
				index++
			}
			continue
		}
		interpreted = append(interpreted, token)
		index++
	}
	return interpreted, spellings, occurrences, nil
}