package espn

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

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

// TeamSchedule fetches a team's full season schedule (completed results and
// upcoming fixtures) from ESPN's team-schedule endpoint — the data behind the
// schedule view, reaching beyond the polled scoreboard window.
func (c *Client) TeamSchedule(ctx context.Context, l model.League, teamID string) (model.TeamSchedule, error) {
	url := fmt.Sprintf("%s/%s/%s/teams/%s/schedule", baseURL, l.Sport, l.Path, teamID)
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
	if err != nil {
		return model.TeamSchedule{}, err
	}
	resp, err := c.HTTP.Do(req)
	if err != nil {
		return model.TeamSchedule{}, fmt.Errorf("schedule %s/%s: %w", l.ID, teamID, err)
	}
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		return model.TeamSchedule{}, fmt.Errorf("schedule %s/%s: status %d", l.ID, teamID, resp.StatusCode)
	}

	var r scheduleResp
	if err := json.NewDecoder(resp.Body).Decode(&r); err != nil {
		return model.TeamSchedule{}, fmt.Errorf("decode schedule %s/%s: %w", l.ID, teamID, err)
	}

	out := model.TeamSchedule{
		Team:   teamFromJSON(r.Team),
		Season: strings.TrimSpace(r.Season.DisplayName + " " + r.Season.Name),
	}
	for _, ev := range r.Events {
		if g, ok := mapScheduleGame(l.ID, ev); ok {
			out.Games = append(out.Games, g)
		}
	}
	sort.SliceStable(out.Games, func(i, j int) bool {
		return out.Games[i].Start.Before(out.Games[j].Start)
	})
	return out, nil
}

func mapScheduleGame(id model.LeagueID, ev schedEvent) (model.Game, bool) {
	if len(ev.Competitions) == 0 {
		return model.Game{}, false
	}
	comp := ev.Competitions[0]
	g := model.Game{
		ID:     ev.ID,
		League: id,
		Start:  parseTime(ev.Date),
		State:  mapState(comp.Status.Type.State),
		Detail: strings.TrimSpace(comp.Status.Type.Detail),
		Venue:  comp.Venue.FullName,
	}
	for _, cmp := range comp.Competitors {
		t := teamFromJSON(cmp.Team)
		t.Score = int(cmp.Score.Value)
		t.Winner = cmp.Winner
		if cmp.HomeAway == "home" {
			g.Home = t
		} else {
			g.Away = t
		}
	}
	return g, true
}

// --- team-schedule JSON -----------------------------------------------------

type scheduleResp struct {
	Team   teamJSON     `json:"team"`
	Season seasonJSON   `json:"season"`
	Events []schedEvent `json:"events"`
}

type seasonJSON struct {
	Name        string `json:"name"`        // "Regular Season"
	DisplayName string `json:"displayName"` // "2026"
}

type schedEvent struct {
	ID           string      `json:"id"`
	Date         string      `json:"date"`
	Competitions []schedComp `json:"competitions"`
}

type schedComp struct {
	Venue       venue             `json:"venue"`
	Status      status            `json:"status"`
	Competitors []schedCompetitor `json:"competitors"`
}

// schedCompetitor mirrors a scoreboard competitor but the score arrives as an
// object ({value, displayValue}) here rather than the scoreboard's bare string.
type schedCompetitor struct {
	HomeAway string   `json:"homeAway"`
	Winner   bool     `json:"winner"`
	Score    scoreObj `json:"score"`
	Team     teamJSON `json:"team"`
}

type scoreObj struct {
	Value        float64 `json:"value"`
	DisplayValue string  `json:"displayValue"`
}