package app

import (
	"fmt"
	"time"

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

const runIDTimestampLayout = "20060102T150405.000000000Z"

type batchNotificationIdentity struct {
	PipelineID     string
	BundleID       string
	IdempotencyKey string
}

func batchRunID(startedAt time.Time, batch BatchKind) string {
	return startedAt.UTC().Format(runIDTimestampLayout) + "_" + string(batch)
}

func renderBatchNotificationIdentity(cfg config.Config, batch BatchKind, runID string, startedAt time.Time) (batchNotificationIdentity, error) {
	values, err := batchNotificationTemplateValues(cfg, batch, runID, startedAt)
	if err != nil {
		return batchNotificationIdentity{}, err
	}

	bundleID, err := config.RenderDistributorBatchBundleID(cfg.Notify.Distributor.Batch.BundleIDTemplate, values)
	if err != nil {
		return batchNotificationIdentity{}, err
	}
	values.BundleID = bundleID

	pipelineID, err := config.RenderDistributorBatchPipelineID(cfg.Notify.Distributor.Batch.PipelineIDTemplate, values)
	if err != nil {
		return batchNotificationIdentity{}, err
	}
	idempotencyKey, err := config.RenderDistributorBatchIdempotencyKey(cfg.Notify.Distributor.Batch.IdempotencyKeyTemplate, values)
	if err != nil {
		return batchNotificationIdentity{}, err
	}

	return batchNotificationIdentity{
		PipelineID:     pipelineID,
		BundleID:       bundleID,
		IdempotencyKey: idempotencyKey,
	}, nil
}

func batchNotificationTemplateValues(cfg config.Config, batch BatchKind, runID string, startedAt time.Time) (config.DistributorBatchTemplateValues, error) {
	location, err := timeutil.LoadLocation(cfg.WeatherAPI.Timezone)
	if err != nil {
		return config.DistributorBatchTemplateValues{}, fmt.Errorf("load batch notification timezone: %w", err)
	}
	return config.DistributorBatchTemplateValues{
		LocationID:       cfg.Location.ID,
		Batch:            string(batch),
		BatchRunID:       runID,
		BatchStartedDate: startedAt.In(location).Format(timeutil.DateLayout),
	}, nil
}