package command

import (
	"fmt"
	"slices"
	"time"

	"go-mod.ewintr.nl/planner/item"
	"go-mod.ewintr.nl/planner/plan/format"
	"go-mod.ewintr.nl/planner/plan/storage"
)

type ListArgs struct {
	fieldTPL    map[string][]string
	HasRecurrer bool
	From        item.Date
	To          item.Date
	Project     string
}

func NewListArgs() ListArgs {
	return ListArgs{
		fieldTPL: map[string][]string{
			"project":   {"p", "project"},
			"from":      {"f", "from"},
			"to":        {"t", "to"},
			"recurring": {"rec", "recurring"},
		},
	}
}

func (la ListArgs) Parse(main []string, fields map[string]string) (Command, error) {
	if len(main) > 2 {
		return nil, ErrWrongCommand
	}

	fields, err := ResolveFields(fields, la.fieldTPL)
	if err != nil {
		return nil, err
	}

	now := time.Now()
	today := item.NewDate(now.Year(), int(now.Month()), now.Day())

	switch len(main) {
	case 0:
		fields["to"] = today.String()
	case 1:
		switch {
		case slices.Contains([]string{"tod", "today"}, main[0]):
			fields["to"] = today.String()
		case slices.Contains([]string{"tom", "tomorrow"}, main[0]):
			fields["from"] = today.Add(1).String()
			fields["to"] = today.Add(1).String()
		case main[0] == "week":
			fields["from"] = today.String()
			fields["to"] = today.Add(7).String()
		case main[0] == "recur":
			fields["recurring"] = "true"
		case main[0] == "list":
			fields["from"] = today.String()
			fields["to"] = today.String()
		default:
			return nil, ErrWrongCommand
		}
	}

	var fromDate, toDate item.Date
	var hasRecurrer bool
	var project string
	if val, ok := fields["from"]; ok {
		fromDate = item.NewDateFromString(val)
	}
	if val, ok := fields["to"]; ok {
		toDate = item.NewDateFromString(val)
	}
	if val, ok := fields["recurrer"]; ok && val == "true" {
		hasRecurrer = true
	}
	if val, ok := fields["project"]; ok {
		project = val
	}

	return List{
		Args: ListArgs{
			HasRecurrer: hasRecurrer,
			From:        fromDate,
			To:          toDate,
			Project:     project,
		},
	}, nil
}

type List struct {
	Args ListArgs
}

func (list List) Do(deps Dependencies) (CommandResult, error) {
	localIDs, err := deps.LocalIDRepo.FindAll()
	if err != nil {
		return nil, fmt.Errorf("could not get local ids: %v", err)
	}
	all, err := deps.TaskRepo.FindMany(storage.TaskListParams{
		HasRecurrer: list.Args.HasRecurrer,
		From:        list.Args.From,
		To:          list.Args.To,
		Project:     list.Args.Project,
	})
	if err != nil {
		return nil, err
	}

	res := make([]TaskWithLID, 0, len(all))
	for _, tsk := range all {
		lid, ok := localIDs[tsk.ID]
		if !ok {
			return nil, fmt.Errorf("could not find local id for %s", tsk.ID)
		}
		res = append(res, TaskWithLID{
			LocalID: lid,
			Task:    tsk,
		})
	}
	return ListResult{
		Tasks: res,
	}, nil
}

type TaskWithLID struct {
	LocalID int
	Task    item.Task
}

type ListResult struct {
	Tasks []TaskWithLID
}

func (lr ListResult) Render() string {
	data := [][]string{{"id", "project", "date", "dur", "title"}}
	for _, tl := range lr.Tasks {
		data = append(data, []string{
			fmt.Sprintf("%d", tl.LocalID),
			tl.Task.Project,
			tl.Task.Date.String(),
			tl.Task.Duration.String(),
			tl.Task.Title,
		})
	}

	return fmt.Sprintf("\n%s\n", format.Table(data))
}