package convids

import (
	"errors"
	"fmt"
	"iter"
	"regexp"
	"slices"
	"strings"
)

var ErrNoName = errors.New("missing name")
var ErrNilPointer = errors.New("nil pointer")

var animePattern = `^\[.+\] `
var animeRegexp = regexp.MustCompile(animePattern)

func (s *Show) Match(path string) (bool, error) {
	if s == nil {
		return false, ErrNilPointer
	}
	if s.Pattern != "" {
		return s.matchRegexp(path)
	}
	if s.Name == "" {
		return false, ErrNoName
	}
	if s.Anime {
		if !animeRegexp.MatchString(path) {
			return false, nil
		}
		path = animeRegexp.ReplaceAllString(path, "")
	}
	return strings.HasPrefix(path, s.Name), nil
}

func (s *Show) matchRegexp(path string) (f bool, err error) {
	if s.re == nil {
		p := s.Pattern
		if s.Anime {
			p = animePattern + strings.TrimPrefix(p, "^")
		} else if !strings.HasPrefix(p, "^") {
			p = "^" + p
		}
		s.re, err = regexp.Compile(p)
		if err != nil {
			return
		}
	}
	return s.re.MatchString(path), nil
}

func (ss *Shows) All() iter.Seq[*Show] {
	if ss == nil {
		return func(func(*Show) bool) {}
	}
	return slices.Values(*ss)
}

func (d *Data) AllShows(silent bool) iter.Seq[*Show] {
	return func(yield func(*Show) bool) {
		if d == nil || d.Config == nil {
			return
		}
		for _, show := range d.Config.Shows {
			sh := (*d.Shows)[show]
			if sh == nil || len(*sh) < 1 {
				continue
			}
			if !silent {
				fmt.Printf("Checking %s shows\n\n", show)
			}
			for s := range sh.All() {
				if s == nil {
					continue
				}
				if !yield(s) {
					return
				}
			}
		}
	}
}