package forecast

import (
	"fmt"
	"time"

	"gitea.maximumdirect.net/eric/weatherreporter/internal/timeutil"
	"gitea.maximumdirect.net/eric/weatherreporter/internal/weatherdata"
)

type DaypartDefinition struct {
	Name  string `json:"name"`
	Start string `json:"start"`
	End   string `json:"end"`
}

type DaypartWindow struct {
	Name   string          `json:"name"`
	Start  time.Time       `json:"start"`
	End    time.Time       `json:"end"`
	Period timeutil.Period `json:"period"`
}

func ResolveDayparts(date time.Time, location *time.Location, definitions []DaypartDefinition) ([]DaypartWindow, error) {
	if len(definitions) == 0 {
		return nil, fmt.Errorf("daypart definitions are required")
	}
	windows := make([]DaypartWindow, 0, len(definitions))
	for i, def := range definitions {
		if def.Name == "" {
			return nil, fmt.Errorf("daypart[%d].name is required", i)
		}
		startClock, err := timeutil.ParseClock(def.Start)
		if err != nil {
			return nil, fmt.Errorf("daypart[%d].start: %w", i, err)
		}
		endClock, err := timeutil.ParseClock(def.End)
		if err != nil {
			return nil, fmt.Errorf("daypart[%d].end: %w", i, err)
		}
		period := timeutil.ClockWindow(date, location, startClock, endClock)
		windows = append(windows, DaypartWindow{
			Name:   def.Name,
			Start:  period.Start,
			End:    period.End,
			Period: period,
		})
	}
	return windows, nil
}

func PeriodForForecastPeriod(period weatherdata.ForecastPeriod) timeutil.Period {
	return timeutil.Period{Start: period.StartTime, End: period.EndTime}
}