package main

import (
	"fmt"
	"io"
	"os"
	"strings"

	"gogs.inhome.blapointe.com/bel/pttodo/pttodo"
	"gopkg.in/yaml.v2"
)

func dump(config config) error {
	return _dump(os.Stdout, config.Targets(), config.tags, config.search, config.root)
}

func _dump(writer io.Writer, filepaths []string, tags []string, search, rootDisplay string) error {
	root, err := pttodo.NewRootFromFiles(filepaths...)
	if err != nil {
		return err
	}

	var v interface{} = root
	switch rootDisplay {
	case DUMP_ALL:
	case DUMP_TODO:
		v = root.Todo
	case DUMP_SCHEDULED:
		v = root.Scheduled
	case DUMP_DONE:
		v = root.Done
	}
	if todos, ok := v.([]pttodo.Todo); ok {
		if len(tags) > 0 {
			result := make([]pttodo.Todo, 0, len(todos))
			for _, todo := range todos {
				skip := false
				for _, tag := range tags {
					positiveTag := strings.TrimLeft(tag, "-")
					hasTag := strings.Contains(todo.Tags, positiveTag)
					wantToHaveTag := !strings.HasPrefix(tag, "-")
					skip = skip || !(hasTag == wantToHaveTag)
				}
				if !skip {
					result = append(result, todo)
				}
			}
			todos = result
		}
		if len(search) > 0 {
			result := make([]pttodo.Todo, 0, len(todos))
			for _, todo := range todos {
				if strings.Contains(strings.ToLower(fmt.Sprint(todo)), strings.ToLower(search)) {
					result = append(result, todo)
				}
			}
			todos = result
		}
		v = todos
	}

	b2, err := yaml.Marshal(v)
	if err != nil {
		return err
	}
	fmt.Fprintf(writer, "%s\n", b2)
	return nil
}