package templates

import (
	"time"

	"backend/internal/db/sqlc"
)

type PlanningAgenda struct {
	Start        time.Time
	End          time.Time
	Today        time.Time
	RangeLabel   string
	PrevURL      string
	TodayURL     string
	NextURL      string
	ShowingToday bool
	Events       []PlanningEventRow
}

type PlanningEventRow struct {
	Title       string
	DateLabel   string
	TimeRange   string
	TabloTitle  string
	TabloColor  string
	HasColor    bool
	Location    string
	HasLocation bool
	URL         string
}

func NewPlanningAgenda(start time.Time, end time.Time, today time.Time, rows []sqlc.ListUserEventsRangeRow) PlanningAgenda {
	events := make([]PlanningEventRow, 0, len(rows))
	for _, row := range rows {
		location := ""
		if row.Location.Valid {
			location = row.Location.String
		}
		color := ""
		if row.TabloColor.Valid {
			color = row.TabloColor.String
		}
		events = append(events, PlanningEventRow{
			Title:       row.Title,
			DateLabel:   PlanningEventDateLabel(row),
			TimeRange:   PlanningEventTimeRange(row),
			TabloTitle:  row.TabloTitle,
			TabloColor:  color,
			HasColor:    color != "",
			Location:    location,
			HasLocation: location != "",
			URL:         PlanningEventURL(row),
		})
	}
	return PlanningAgenda{
		Start:        start,
		End:          end,
		Today:        today,
		RangeLabel:   PlanningRangeLabel(start, end),
		PrevURL:      PlanningURL(start.AddDate(0, 0, -14)),
		TodayURL:     "/planning",
		NextURL:      PlanningURL(start.AddDate(0, 0, 14)),
		ShowingToday: samePlanningDay(start, today),
		Events:       events,
	}
}

func PlanningURL(start time.Time) string {
	return "/planning?start=" + start.Format("2006-01-02")
}

func PlanningEventURL(row sqlc.ListUserEventsRangeRow) string {
	return "/tablos/" + row.TabloID.String() + "/events?month=" + row.EventDate.Time.Format("2006-01")
}

func PlanningEventDateLabel(row sqlc.ListUserEventsRangeRow) string {
	if !row.EventDate.Valid {
		return ""
	}
	return row.EventDate.Time.Format("Jan 2, 2006")
}

func PlanningEventTimeRange(row sqlc.ListUserEventsRangeRow) string {
	start := FormatEventTime(row.StartTime)
	if start == "" {
		return ""
	}
	if !row.EndTime.Valid {
		return start
	}
	return start + "-" + FormatEventTime(row.EndTime)
}

func PlanningRangeLabel(start time.Time, end time.Time) string {
	if start.Year() == end.Year() {
		return start.Format("January 2") + " - " + end.Format("January 2, 2006")
	}
	return start.Format("January 2, 2006") + " - " + end.Format("January 2, 2006")
}

func samePlanningDay(a time.Time, b time.Time) bool {
	return a.Year() == b.Year() && a.Month() == b.Month() && a.Day() == b.Day()
}