// Lighting & Shadow System - Dynamic lighting and shadows
class LightingSystem {
    constructor(scene) {
        this.scene = scene;
        this.shadows = new Map(); // Entity → Shadow sprite
        this.lights = new Map(); // Source → Light circle

        console.log('💡 LightingSystem initialized');
    }

    // Create shadow for an entity (player, NPC, etc.)
    createShadow(entity, offsetY = 10, width = 30, height = 15) {
        if (!entity || !entity.sprite) return null;

        const shadow = this.scene.add.ellipse(
            entity.sprite.x,
            entity.sprite.y + offsetY,
            width,
            height,
            0x000000,
            0.3
        );

        shadow.setDepth(entity.sprite.depth - 1); // Always below entity
        this.shadows.set(entity, { shadow, offsetY, width, height });

        return shadow;
    }

    // Update shadow position (call in entity update)
    updateShadow(entity) {
        const data = this.shadows.get(entity);
        if (!data || !entity.sprite) return;

        const { shadow, offsetY } = data;
        shadow.setPosition(entity.sprite.x, entity.sprite.y + offsetY);

        // Adjust shadow opacity based on time of day
        if (this.scene.weatherSystem) {
            const hour = this.scene.weatherSystem.getCurrentHour();
            let opacity = 0.3;

            if (hour >= 5 && hour < 7) {
                // Dawn - weak shadow
                opacity = 0.1 + ((hour - 5) / 2) * 0.2;
            } else if (hour >= 7 && hour < 18) {
                // Day - strong shadow
                opacity = 0.3;
            } else if (hour >= 18 && hour < 20) {
                // Dusk - fading shadow
                opacity = 0.3 - ((hour - 18) / 2) * 0.2;
            } else {
                // Night - very weak shadow
                opacity = 0.1;
            }

            shadow.setAlpha(opacity);
        }
    }

    // Remove shadow
    removeShadow(entity) {
        const data = this.shadows.get(entity);
        if (data && data.shadow) {
            data.shadow.destroy();
        }
        this.shadows.delete(entity);
    }

    // Create light source (torch, campfire, etc.)
    createLight(x, y, radius = 100, color = 0xffee88, alpha = 0.3, flicker = false) {
        const light = this.scene.add.circle(x, y, radius, color, alpha);
        light.setBlendMode(Phaser.BlendModes.ADD);
        light.setDepth(999990); // Above most things

        const lightData = {
            light,
            radius,
            color,
            baseAlpha: alpha,
            flicker,
            flickerTimer: 0
        };

        this.lights.set(light, lightData);

        return light;
    }

    // Create player torch (follows player at night)
    createPlayerTorch(player) {
        if (!player || !player.sprite) return null;

        const torch = this.scene.add.circle(
            player.sprite.x,
            player.sprite.y,
            80,
            0xffee88,
            0
        );

        torch.setBlendMode(Phaser.BlendModes.ADD);
        torch.setDepth(999990);

        this.lights.set(torch, {
            light: torch,
            radius: 80,
            color: 0xffee88,
            baseAlpha: 0.35,
            flicker: true,
            flickerTimer: 0,
            followPlayer: player
        });

        return torch;
    }

    // Update all lights
    update(delta) {
        const isNight = this.scene.weatherSystem ? this.scene.weatherSystem.isNight() : false;

        for (const [light, data] of this.lights) {
            // Follow player if assigned
            if (data.followPlayer && data.followPlayer.sprite) {
                light.setPosition(
                    data.followPlayer.sprite.x,
                    data.followPlayer.sprite.y
                );

                // Only show torch at night
                if (isNight) {
                    light.setAlpha(data.baseAlpha);
                } else {
                    light.setAlpha(0); // Hidden during day
                }
            }

            // Flicker effect
            if (data.flicker) {
                data.flickerTimer += delta;
                if (data.flickerTimer > 50) { // Every 50ms
                    data.flickerTimer = 0;
                    const flicker = data.baseAlpha + (Math.random() * 0.1 - 0.05);
                    if (isNight || !data.followPlayer) {
                        light.setAlpha(Phaser.Math.Clamp(flicker, 0, 1));
                    }
                }
            }
        }

        // Update all shadows
        for (const [entity, data] of this.shadows) {
            this.updateShadow(entity);
        }
    }

    // Remove light
    removeLight(light) {
        const data = this.lights.get(light);
        if (data && data.light) {
            data.light.destroy();
        }
        this.lights.delete(light);
    }

    // Create campfire effect (static light with particles)
    createCampfire(x, y) {
        // Light glow
        const light = this.createLight(x, y, 120, 0xff6600, 0.4, true);

        // Smoke particles (if ParticleEffects exists)
        if (this.scene.particleEffects) {
            // Add smoke rising from campfire
            // (Implement in ParticleEffects system)
        }

        return light;
    }

    // Clean up
    destroy() {
        // Remove all shadows
        for (const [entity, data] of this.shadows) {
            this.removeShadow(entity);
        }

        // Remove all lights
        for (const [light, data] of this.lights) {
            this.removeLight(light);
        }

        console.log('💡 LightingSystem destroyed');
    }
}