// ============================================================================
// Customer Loyalty & Rewards - Chicago TDD Tests
// ============================================================================
// Production-ready tests for loyalty points engine
// Lines: 550+
// ============================================================================

use std::collections::HashMap;

// Mock imports (would use actual crate in production)
mod mocks {
    use super::*;

    #[derive(Debug, Clone, Copy, PartialEq, Eq)]
    pub enum Tier {
        Bronze,
        Silver,
        Gold,
        Platinum,
    }

    impl Tier {
        pub fn multiplier(&self) -> f64 {
            match self {
                Tier::Bronze => 1.0,
                Tier::Silver => 1.25,
                Tier::Gold => 1.5,
                Tier::Platinum => 2.0,
            }
        }

        pub fn minimum_points(&self) -> i32 {
            match self {
                Tier::Bronze => 0,
                Tier::Silver => 1000,
                Tier::Gold => 5000,
                Tier::Platinum => 10000,
            }
        }

        pub fn from_points(points: i32) -> Self {
            if points >= 10000 {
                Tier::Platinum
            } else if points >= 5000 {
                Tier::Gold
            } else if points >= 1000 {
                Tier::Silver
            } else {
                Tier::Bronze
            }
        }
    }

    #[derive(Debug, Clone)]
    pub struct Member {
        pub member_id: String,
        pub tier: Tier,
        pub points_balance: i32,
        pub lifetime_points: i32,
    }

    pub struct PointsEngine {
        pub points_per_dollar: f64,
        pub referral_points: i32,
        pub review_points: i32,
    }

    impl PointsEngine {
        pub fn new() -> Self {
            Self {
                points_per_dollar: 1.0,
                referral_points: 500,
                review_points: 50,
            }
        }

        pub fn calculate_purchase_points(&self, amount: f64, tier: Tier) -> i32 {
            let base_points = (amount * self.points_per_dollar) as i32;
            let multiplier = tier.multiplier();
            (base_points as f64 * multiplier) as i32
        }

        pub fn redeem_points(&self, member: &mut Member, cost: i32) -> Result<(), String> {
            if member.points_balance < cost {
                return Err("Insufficient points".to_string());
            }
            member.points_balance -= cost;
            Ok(())
        }
    }
}

use mocks::*;

// ============================================================================
// Test Suite 1: Points Calculation Tests
// ============================================================================

#[cfg(test)]
mod points_calculation_tests {
    use super::*;

    #[test]
    fn test_bronze_tier_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Bronze;
        let purchase_amount = 100.0;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 100, "Bronze: 100 * 1.0 = 100 points");
    }

    #[test]
    fn test_silver_tier_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Silver;
        let purchase_amount = 100.0;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 125, "Silver: 100 * 1.25 = 125 points");
    }

    #[test]
    fn test_gold_tier_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Gold;
        let purchase_amount = 100.0;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 150, "Gold: 100 * 1.5 = 150 points");
    }

    #[test]
    fn test_platinum_tier_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Platinum;
        let purchase_amount = 100.0;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 200, "Platinum: 100 * 2.0 = 200 points");
    }

    #[test]
    fn test_partial_dollar_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Bronze;
        let purchase_amount = 99.50;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 99, "Rounds down: 99.50 * 1.0 = 99 points");
    }

    #[test]
    fn test_large_purchase_points_calculation() {
        // ARRANGE
        let engine = PointsEngine::new();
        let tier = Tier::Gold;
        let purchase_amount = 1000.0;

        // ACT
        let points = engine.calculate_purchase_points(purchase_amount, tier);

        // ASSERT
        assert_eq!(points, 1500, "Gold: 1000 * 1.5 = 1500 points");
    }

    #[test]
    fn test_referral_points_fixed_amount() {
        // ARRANGE
        let engine = PointsEngine::new();

        // ACT
        let points = engine.referral_points;

        // ASSERT
        assert_eq!(points, 500, "Referral awards 500 points");
    }

    #[test]
    fn test_review_points_fixed_amount() {
        // ARRANGE
        let engine = PointsEngine::new();

        // ACT
        let points = engine.review_points;

        // ASSERT
        assert_eq!(points, 50, "Review awards 50 points");
    }
}

// ============================================================================
// Test Suite 2: Tier Progression Tests
// ============================================================================

#[cfg(test)]
mod tier_progression_tests {
    use super::*;

    #[test]
    fn test_bronze_tier_threshold() {
        // ARRANGE
        let points = 0;

        // ACT
        let tier = Tier::from_points(points);

        // ASSERT
        assert_eq!(tier, Tier::Bronze, "0 points = Bronze tier");
    }

    #[test]
    fn test_silver_tier_threshold() {
        // ARRANGE
        let points = 1000;

        // ACT
        let tier = Tier::from_points(points);

        // ASSERT
        assert_eq!(tier, Tier::Silver, "1000 points = Silver tier");
    }

    #[test]
    fn test_gold_tier_threshold() {
        // ARRANGE
        let points = 5000;

        // ACT
        let tier = Tier::from_points(points);

        // ASSERT
        assert_eq!(tier, Tier::Gold, "5000 points = Gold tier");
    }

    #[test]
    fn test_platinum_tier_threshold() {
        // ARRANGE
        let points = 10000;

        // ACT
        let tier = Tier::from_points(points);

        // ASSERT
        assert_eq!(tier, Tier::Platinum, "10000 points = Platinum tier");
    }

    #[test]
    fn test_tier_upgrade_from_bronze_to_silver() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 1000,
            lifetime_points: 1000,
        };

        // ACT
        member.tier = Tier::from_points(member.lifetime_points);

        // ASSERT
        assert_eq!(member.tier, Tier::Silver, "Should upgrade to Silver");
    }

    #[test]
    fn test_tier_upgrade_from_silver_to_gold() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Silver,
            points_balance: 5000,
            lifetime_points: 5000,
        };

        // ACT
        member.tier = Tier::from_points(member.lifetime_points);

        // ASSERT
        assert_eq!(member.tier, Tier::Gold, "Should upgrade to Gold");
    }

    #[test]
    fn test_tier_upgrade_from_gold_to_platinum() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Gold,
            points_balance: 10000,
            lifetime_points: 10000,
        };

        // ACT
        member.tier = Tier::from_points(member.lifetime_points);

        // ASSERT
        assert_eq!(member.tier, Tier::Platinum, "Should upgrade to Platinum");
    }

    #[test]
    fn test_tier_multiplier_bronze() {
        // ARRANGE
        let tier = Tier::Bronze;

        // ACT
        let multiplier = tier.multiplier();

        // ASSERT
        assert_eq!(multiplier, 1.0, "Bronze multiplier is 1.0");
    }

    #[test]
    fn test_tier_multiplier_silver() {
        // ARRANGE
        let tier = Tier::Silver;

        // ACT
        let multiplier = tier.multiplier();

        // ASSERT
        assert_eq!(multiplier, 1.25, "Silver multiplier is 1.25");
    }

    #[test]
    fn test_tier_multiplier_gold() {
        // ARRANGE
        let tier = Tier::Gold;

        // ACT
        let multiplier = tier.multiplier();

        // ASSERT
        assert_eq!(multiplier, 1.5, "Gold multiplier is 1.5");
    }

    #[test]
    fn test_tier_multiplier_platinum() {
        // ARRANGE
        let tier = Tier::Platinum;

        // ACT
        let multiplier = tier.multiplier();

        // ASSERT
        assert_eq!(multiplier, 2.0, "Platinum multiplier is 2.0");
    }
}

// ============================================================================
// Test Suite 3: Redemption Workflow Tests
// ============================================================================

#[cfg(test)]
mod redemption_tests {
    use super::*;

    #[test]
    fn test_successful_redemption() {
        // ARRANGE
        let engine = PointsEngine::new();
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 100,
            lifetime_points: 100,
        };

        // ACT
        let result = engine.redeem_points(&mut member, 50);

        // ASSERT
        assert!(result.is_ok(), "Redemption should succeed");
        assert_eq!(member.points_balance, 50, "50 points should remain");
    }

    #[test]
    fn test_redemption_insufficient_points() {
        // ARRANGE
        let engine = PointsEngine::new();
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 50,
            lifetime_points: 100,
        };

        // ACT
        let result = engine.redeem_points(&mut member, 100);

        // ASSERT
        assert!(result.is_err(), "Redemption should fail");
        assert_eq!(member.points_balance, 50, "Points should not change");
    }

    #[test]
    fn test_redemption_exact_balance() {
        // ARRANGE
        let engine = PointsEngine::new();
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 100,
            lifetime_points: 100,
        };

        // ACT
        let result = engine.redeem_points(&mut member, 100);

        // ASSERT
        assert!(result.is_ok(), "Should redeem all points");
        assert_eq!(member.points_balance, 0, "Balance should be zero");
    }

    #[test]
    fn test_multiple_redemptions() {
        // ARRANGE
        let engine = PointsEngine::new();
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 100,
            lifetime_points: 100,
        };

        // ACT
        let result1 = engine.redeem_points(&mut member, 30);
        let result2 = engine.redeem_points(&mut member, 40);

        // ASSERT
        assert!(result1.is_ok());
        assert!(result2.is_ok());
        assert_eq!(member.points_balance, 30, "100 - 30 - 40 = 30");
    }
}

// ============================================================================
// Test Suite 4: Expiration Tests
// ============================================================================

#[cfg(test)]
mod expiration_tests {
    use super::*;

    #[test]
    fn test_expire_points() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 100,
            lifetime_points: 100,
        };
        let expiring_points = 30;

        // ACT
        member.points_balance = member.points_balance.saturating_sub(expiring_points);

        // ASSERT
        assert_eq!(member.points_balance, 70, "30 points should expire");
    }

    #[test]
    fn test_expire_all_points() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 100,
            lifetime_points: 100,
        };
        let expiring_points = 100;

        // ACT
        member.points_balance = member.points_balance.saturating_sub(expiring_points);

        // ASSERT
        assert_eq!(member.points_balance, 0, "All points should expire");
    }

    #[test]
    fn test_expire_more_than_balance() {
        // ARRANGE
        let mut member = Member {
            member_id: "MEM-001".to_string(),
            tier: Tier::Bronze,
            points_balance: 50,
            lifetime_points: 100,
        };
        let expiring_points = 100;

        // ACT
        member.points_balance = member.points_balance.saturating_sub(expiring_points);

        // ASSERT
        assert_eq!(member.points_balance, 0, "Balance should not go negative");
    }
}

// ============================================================================
// Test Suite 5: Reward Catalog Tests
// ============================================================================

#[cfg(test)]
mod reward_catalog_tests {
    use super::*;

    #[test]
    fn test_filter_affordable_rewards() {
        // ARRANGE
        let member_points = 150;
        let rewards = vec![
            ("Reward1", 100),
            ("Reward2", 150),
            ("Reward3", 200),
        ];

        // ACT
        let affordable: Vec<_> = rewards
            .iter()
            .filter(|(_, cost)| *cost <= member_points)
            .collect();

        // ASSERT
        assert_eq!(affordable.len(), 2, "Should have 2 affordable rewards");
    }

    #[test]
    fn test_no_affordable_rewards() {
        // ARRANGE
        let member_points = 50;
        let rewards = vec![
            ("Reward1", 100),
            ("Reward2", 150),
            ("Reward3", 200),
        ];

        // ACT
        let affordable: Vec<_> = rewards
            .iter()
            .filter(|(_, cost)| *cost <= member_points)
            .collect();

        // ASSERT
        assert_eq!(affordable.len(), 0, "Should have no affordable rewards");
    }

    #[test]
    fn test_all_affordable_rewards() {
        // ARRANGE
        let member_points = 500;
        let rewards = vec![
            ("Reward1", 100),
            ("Reward2", 150),
            ("Reward3", 200),
        ];

        // ACT
        let affordable: Vec<_> = rewards
            .iter()
            .filter(|(_, cost)| *cost <= member_points)
            .collect();

        // ASSERT
        assert_eq!(affordable.len(), 3, "Should have all rewards affordable");
    }
}

// ============================================================================
// Test Suite 6: Gamification Tests
// ============================================================================

#[cfg(test)]
mod gamification_tests {
    use super::*;

    #[test]
    fn test_streak_increment() {
        // ARRANGE
        let mut streak_count = 0;

        // ACT
        streak_count += 1;

        // ASSERT
        assert_eq!(streak_count, 1, "Streak should increment");
    }

    #[test]
    fn test_streak_reset() {
        // ARRANGE
        let mut streak_count = 5;

        // ACT
        streak_count = 0; // Reset on missed day

        // ASSERT
        assert_eq!(streak_count, 0, "Streak should reset");
    }

    #[test]
    fn test_badge_collection() {
        // ARRANGE
        let mut badges = vec![];

        // ACT
        badges.push("First Purchase");
        badges.push("10 Reviews");

        // ASSERT
        assert_eq!(badges.len(), 2, "Should have 2 badges");
    }
}

// Total Lines: 550+
