// outlooks_read.go executes outlook-run and outlook queries.
// Layer: adapters/outbound/postgres outlook feature.
package postgres

import (
	"context"
	"database/sql"
	"errors"
	"fmt"

	"gitea.maximumdirect.net/ejr/weatherfeeder/model"
)

func (r *Repository) LatestConvectiveOutlookRun(ctx context.Context) (*model.WeatherOutlookRun, error) {
	if r == nil || r.db == nil {
		return nil, fmt.Errorf("postgres repository is not configured")
	}

	var row outlookRunParentRow
	err := r.db.QueryRowContext(ctx, queryLatestConvectiveOutlookRun).Scan(
		&row.EventID,
		&row.LocationID,
		&row.LocationName,
		&row.Latitude,
		&row.Longitude,
		&row.AsOf,
		&row.IssuedAt,
	)
	if errors.Is(err, sql.ErrNoRows) {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("query latest convective outlook run: %w", err)
	}

	run := mapOutlookRunParentRow(row)
	outlooks, err := r.loadOutlooks(ctx, row.EventID)
	if err != nil {
		return nil, err
	}
	run.Outlooks = outlooks

	discussions, err := r.loadOutlookDiscussions(ctx, row.EventID)
	if err != nil {
		return nil, err
	}
	run.Discussions = discussions

	return &run, nil
}

func (r *Repository) loadOutlooks(ctx context.Context, eventID string) ([]model.WeatherOutlook, error) {
	rows, err := r.db.QueryContext(ctx, queryOutlooksForRun, eventID)
	if err != nil {
		return nil, fmt.Errorf("query outlooks: %w", err)
	}
	defer rows.Close()

	out := make([]model.WeatherOutlook, 0)
	for rows.Next() {
		var row outlookRow
		if err := rows.Scan(
			&row.OutlookIndex,
			&row.OutlookID,
			&row.Provider,
			&row.Product,
			&row.Day,
			&row.OutlookType,
			&row.Label,
			&row.LabelText,
			&row.SeverityRank,
			&row.ValidFrom,
			&row.ValidTo,
			&row.IssuedAt,
			&row.ExpiresAt,
			&row.Forecaster,
			&row.SourceURL,
			&row.ImageURL,
			&row.ContainsLocation,
			&row.GeometryJSON,
		); err != nil {
			return nil, fmt.Errorf("scan outlook row: %w", err)
		}

		outlook, err := mapOutlookRow(row)
		if err != nil {
			return nil, fmt.Errorf("map outlook row: %w", err)
		}
		out = append(out, outlook)
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("iterate outlook rows: %w", err)
	}
	return out, nil
}

func (r *Repository) loadOutlookDiscussions(ctx context.Context, eventID string) ([]model.WeatherOutlookDiscussion, error) {
	rows, err := r.db.QueryContext(ctx, queryOutlookDiscussionsForRun, eventID)
	if err != nil {
		return nil, fmt.Errorf("query outlook discussions: %w", err)
	}
	defer rows.Close()

	out := make([]model.WeatherOutlookDiscussion, 0)
	for rows.Next() {
		var row outlookDiscussionRow
		if err := rows.Scan(
			&row.DiscussionIndex,
			&row.Day,
			&row.Headline,
			&row.Summary,
			&row.Discussion,
			&row.UpdatedAt,
		); err != nil {
			return nil, fmt.Errorf("scan outlook discussion row: %w", err)
		}

		out = append(out, mapOutlookDiscussionRow(row))
	}
	if err := rows.Err(); err != nil {
		return nil, fmt.Errorf("iterate outlook discussion rows: %w", err)
	}
	return out, nil
}