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package espn

import (
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"strings"

	"github.com/humdrum-tiv/sportsball/internal/model"
)

// Summary fetches the deeper per-game data (key events for soccer, box score
// for the stick-and-ball sports) from ESPN's summary endpoint and maps it into
// a league-agnostic model.GameDetail. This is the richer fetch behind the
// detail view, keyed by ESPN event ID.
func (c *Client) Summary(ctx context.Context, l model.League, eventID string) (model.GameDetail, error) {
	url := fmt.Sprintf("%s/%s/%s/summary?event=%s", baseURL, l.Sport, l.Path, eventID)
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return model.GameDetail{}, err
	}
	resp, err := c.HTTP.Do(req)
	if err != nil {
		return model.GameDetail{}, fmt.Errorf("summary %s: %w", eventID, err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return model.GameDetail{}, fmt.Errorf("summary %s: status %d", eventID, resp.StatusCode)
	}

	var s summary
	if err := json.NewDecoder(resp.Body).Decode(&s); err != nil {
		return model.GameDetail{}, fmt.Errorf("decode summary %s: %w", eventID, err)
	}
	return mapSummary(s), nil
}

func mapSummary(s summary) model.GameDetail {
	d := model.GameDetail{}
	for _, e := range s.KeyEvents {
		d.Events = append(d.Events, mapKeyEvent(e))
	}
	// Scoring plays back the baseball timeline (soccer uses keyEvents above).
	// They're mutually exclusive per sport, so both feed model.Events.
	for _, p := range s.Plays {
		if p.ScoringPlay {
			d.Events = append(d.Events, mapScoringPlay(p))
		}
	}
	for _, tb := range s.Boxscore.Players {
		d.BoxScore = append(d.BoxScore, mapTeamBox(tb))
	}
	d.TeamStats = mapTeamStats(s.Boxscore.Teams)
	return d
}

// soccerTeamStatOrder is the curated subset of team stats shown as comparison
// bars, in display order. ESPN ships many more; these are the legible ones.
var soccerTeamStatOrder = []string{
	"possessionPct", "totalShots", "shotsOnTarget", "wonCorners", "foulsCommitted", "saves",
}

// mapTeamStats pairs the two teams' flat stat lists into away-vs-home rows for
// the curated stats present. Returns nil unless both home and away are found
// (the stick-and-ball sports nest team stats differently and yield nothing).
func mapTeamStats(teams []teamStatBox) []model.TeamStat {
	var home, away map[string]teamStatJSON
	for _, t := range teams {
		m := make(map[string]teamStatJSON, len(t.Statistics))
		for _, s := range t.Statistics {
			m[s.Name] = s
		}
		if t.HomeAway == "home" {
			home = m
		} else {
			away = m
		}
	}
	if home == nil || away == nil {
		return nil
	}
	var out []model.TeamStat
	for _, key := range soccerTeamStatOrder {
		h, okh := home[key]
		a, oka := away[key]
		if !okh && !oka {
			continue
		}
		out = append(out, model.TeamStat{
			Label: firstNonEmpty(h.Label, a.Label, key),
			Key:   key,
			Away:  a.DisplayValue,
			Home:  h.DisplayValue,
		})
	}
	return out
}

// mapScoringPlay converts a baseball scoring play into a MatchEvent. Clock is a
// compact half-inning marker (▲ top / ▼ bottom + inning); Team is matched by
// ID since the plays array only carries the team id.
func mapScoringPlay(p play) model.MatchEvent {
	mark := ""
	switch p.Period.Type {
	case "Top":
		mark = "▲"
	case "Bottom":
		mark = "▼"
	}
	clock := mark + fmt.Sprintf("%d", p.Period.Number)
	text := strings.TrimSpace(p.Text)
	return model.MatchEvent{
		Clock:     clock,
		Period:    p.Period.Number,
		Type:      strings.TrimSpace(p.AlternativeType.Text),
		Text:      text,
		ShortText: text,
		TeamID:    p.Team.ID,
		Scoring:   true,
	}
}

func mapKeyEvent(e keyEvent) model.MatchEvent {
	me := model.MatchEvent{
		Clock:     e.Clock.DisplayValue,
		Period:    e.Period.Number,
		Type:      strings.TrimSpace(e.Type.Text),
		Text:      strings.TrimSpace(e.Text),
		ShortText: strings.TrimSpace(e.ShortText),
		Team:      e.Team.DisplayName,
		TeamID:    e.Team.ID,
		Scoring:   e.ScoringPlay,
	}
	for _, p := range e.Participants {
		if n := p.Athlete.DisplayName; n != "" {
			me.Athletes = append(me.Athletes, n)
		}
	}
	return me
}

func mapTeamBox(tb playerBox) model.TeamBox {
	box := model.TeamBox{
		Abbr: tb.Team.Abbreviation,
		Name: tb.Team.DisplayName,
	}
	for _, st := range tb.Statistics {
		g := model.StatGroup{
			Name:   firstNonEmpty(st.Name, st.Type, st.DisplayName),
			Labels: st.Labels,
		}
		for _, a := range st.Athletes {
			name := a.Athlete.ShortName
			if name == "" {
				name = a.Athlete.DisplayName
			}
			g.Rows = append(g.Rows, model.PlayerRow{Athlete: name, Stats: a.Stats})
		}
		box.Groups = append(box.Groups, g)
	}
	return box
}

func firstNonEmpty(ss ...string) string {
	for _, s := range ss {
		if s != "" {
			return s
		}
	}
	return ""
}