package models

import (
	"database/sql"
	"time"
)

// Player represents an anonymous player identified by a client-generated UUID.
type Player struct {
	ID            int64     `json:"-"`
	ClientID      string    `json:"client_id"`
	FirstSeen     time.Time `json:"first_seen"`
	LastSeen      time.Time `json:"last_seen"`
	TotalSessions int       `json:"total_sessions"`
}

// PlayerIP tracks distinct IP addresses a player has connected from.
type PlayerIP struct {
	ID        int64     `json:"-"`
	PlayerID  int64     `json:"-"`
	IPAddress string    `json:"ip_address"`
	FirstSeen time.Time `json:"first_seen"`
	LastSeen  time.Time `json:"last_seen"`
}

// GameSession represents a single play session.
type GameSession struct {
	ID              string    `json:"session_id"`
	PlayerID        int64     `json:"-"`
	Score           int       `json:"score"`
	LevelReached    int       `json:"level_reached"`
	LivesUsed       int       `json:"lives_used"`
	DurationSeconds int       `json:"duration_seconds"`
	EndReason       string    `json:"end_reason"`
	StartedAt       time.Time `json:"started_at"`
	EndedAt         time.Time `json:"ended_at"`
}

// DeviceInfo holds browser/device fingerprint data captured per session.
type DeviceInfo struct {
	ID               int64           `json:"-"`
	SessionID        string          `json:"-"`
	IPAddress        string          `json:"ip_address"`
	UserAgent        string          `json:"user_agent"`
	Platform         string          `json:"platform"`
	Language         string          `json:"language"`
	ScreenWidth      sql.NullInt32   `json:"screen_width"`
	ScreenHeight     sql.NullInt32   `json:"screen_height"`
	DevicePixelRatio sql.NullFloat64 `json:"device_pixel_ratio"`
	Timezone         string          `json:"timezone"`
	WebGLRenderer    string          `json:"webgl_renderer"`
	TouchSupport     bool            `json:"touch_support"`
}

// HighScore is a denormalized personal-best record, one per player.
type HighScore struct {
	ID         int64          `json:"-"`
	PlayerID   int64          `json:"-"`
	Score      int            `json:"score"`
	SessionID  sql.NullString `json:"-"`
	AchievedAt time.Time      `json:"achieved_at"`
}

// --- Request/Response types ---

// DeviceInfoRequest is the optional device payload in session start.
type DeviceInfoRequest struct {
	Platform         string   `json:"platform"`
	Language         string   `json:"language"`
	ScreenWidth      *int     `json:"screen_width"`
	ScreenHeight     *int     `json:"screen_height"`
	DevicePixelRatio *float64 `json:"device_pixel_ratio"`
	Timezone         string   `json:"timezone"`
	WebGLRenderer    string   `json:"webgl_renderer"`
	TouchSupport     bool     `json:"touch_support"`
}

// SessionStartRequest is the JSON body for POST /session/start/.
type SessionStartRequest struct {
	ClientID string             `json:"client_id"`
	Device   *DeviceInfoRequest `json:"device"`
}

// SessionEndRequest is the JSON body for POST /session/:id/end/.
type SessionEndRequest struct {
	Score           int    `json:"score"`
	LevelReached    int    `json:"level_reached"`
	LivesUsed       int    `json:"lives_used"`
	DurationSeconds int    `json:"duration_seconds"`
	EndReason       string `json:"end_reason"`
}

// LeaderboardEntry is a single row in the leaderboard response.
type LeaderboardEntry struct {
	ClientID   string    `json:"client_id"`
	Score      int       `json:"score"`
	AchievedAt time.Time `json:"achieved_at"`
}

// SessionSummary is a session entry in the player stats response.
type SessionSummary struct {
	SessionID       string    `json:"session_id"`
	Score           int       `json:"score"`
	LevelReached    int       `json:"level_reached"`
	LivesUsed       int       `json:"lives_used"`
	DurationSeconds int       `json:"duration_seconds"`
	EndReason       string    `json:"end_reason"`
	StartedAt       time.Time `json:"started_at"`
	EndedAt         time.Time `json:"ended_at"`
}

// PlayerStatsResponse is the response for GET /player/:client_id/.
type PlayerStatsResponse struct {
	ClientID      string           `json:"client_id"`
	TotalSessions int              `json:"total_sessions"`
	FirstSeen     time.Time        `json:"first_seen"`
	HighScore     *int             `json:"high_score"`
	Sessions      []SessionSummary `json:"sessions"`
}