//! # Educational Parallel Computing Modes Example
//!
//! Demonstrates the evolution of parallel computing paradigms through
//! WaveSim's educational simulation modes.
//!
//! ## Run this example:
//! ```bash
//! cargo run -p ringkernel-wavesim --example educational_modes
//! ```
//!
//! ## Run the interactive GUI:
//! ```bash
//! cargo run -p ringkernel-wavesim --bin wavesim --release
//! ```
//!
//! ## What this demonstrates:
//!
//! WaveSim includes animated visualization modes that show how different
//! computing paradigms process data. These are designed for teaching
//! and presentations about the history of parallel computing.
//!
//! | Mode | Era | Description |
//! |------|-----|-------------|
//! | CellByCell | 1950s | Sequential processing, one cell at a time |
//! | RowByRow | 1970s | Vector processing (Cray-style), row by row |
//! | ChaoticParallel | 1990s | Uncoordinated parallelism (shows race conditions!) |
//! | SynchronizedParallel | 2000s | Barrier-synchronized parallelism |
//! | ActorBased | Modern | Tile-based actors with HLC for causal ordering |

use ringkernel_wavesim::simulation::{EducationalProcessor, SimulationMode};

fn main() {
    println!("=== Educational Parallel Computing Modes ===\n");
    println!("These modes visualize how computing paradigms evolved.\n");

    // ========== List All Modes ==========
    println!("--- Available Simulation Modes ---\n");

    for mode in SimulationMode::all() {
        println!("{}", mode);
        println!("  Description: {}\n", mode.description());
    }

    // ========== Mode Details ==========
    println!("--- Mode Details ---\n");

    println!("1. CELL-BY-CELL (1950s Sequential)");
    println!("   Era: Early electronic computers (ENIAC, UNIVAC)");
    println!("   Pattern: Process one cell at a time, left-to-right, top-to-bottom");
    println!("   Visual: Green highlight on current cell");
    println!("   Lesson: \"This is how early computers worked - one operation at a time\"");
    println!();

    println!("2. ROW-BY-ROW (1970s Vector Processing)");
    println!("   Era: Cray-1, early vector supercomputers");
    println!("   Pattern: Process entire rows at once");
    println!("   Visual: Yellow highlight sweeping down row by row");
    println!(
        "   Lesson: \"Vector processors and SIMD - process multiple data with one instruction\""
    );
    println!();

    println!("3. CHAOTIC PARALLEL (1990s Naive Parallelism)");
    println!("   Era: Early multi-processor systems");
    println!("   Pattern: All cells update simultaneously with random delays");
    println!("   Visual: Random cells flash green in unpredictable order");
    println!("   Lesson: \"Parallel without coordination = chaos and race conditions\"");
    println!("   WARNING: This mode intentionally shows incorrect behavior!");
    println!();

    println!("4. SYNCHRONIZED PARALLEL (2000s Barrier Sync)");
    println!("   Era: MPI, OpenMP, early GPGPU");
    println!("   Pattern: All cells compute in parallel, then synchronize");
    println!("   Visual: All interior cells flash green simultaneously");
    println!("   Lesson: \"Barriers ensure correctness but create bottlenecks\"");
    println!();

    println!("5. ACTOR-BASED (Modern - Causal Consistency)");
    println!("   Era: Modern distributed systems, RingKernel actor model");
    println!("   Pattern: Tiles process independently with HLC ordering");
    println!("   Visual: Cyan tiles with borders highlight active regions");
    println!("   Lesson: \"Actors + HLC = parallelism without chaos\"");
    println!();

    // ========== EducationalProcessor Demo ==========
    println!("--- EducationalProcessor Configuration ---\n");

    let mut processor = EducationalProcessor::new(SimulationMode::CellByCell);
    println!("Created processor with mode: {:?}", processor.mode);
    println!("  cells_per_frame: {}", processor.cells_per_frame);
    println!();

    // Change mode
    processor.set_mode(SimulationMode::ActorBased);
    println!("Changed to mode: {:?}", processor.mode);

    // Show processing state
    let state = &processor.state;
    println!("Processing state:");
    println!("  current_cell: {:?}", state.current_cell);
    println!("  current_row: {:?}", state.current_row);
    println!("  active_tiles: {:?}", state.active_tiles);
    println!("  step_complete: {}", state.step_complete);
    println!();

    // ========== Visual Indicators ==========
    println!("--- Visual Indicators in GUI ---\n");
    println!("| Color   | Shape         | Mode(s)                | Meaning              |");
    println!("|---------|---------------|------------------------|----------------------|");
    println!("| Green   | Cell overlay  | CellByCell, Chaotic,   | Cell being processed |");
    println!("|         |               | Synchronized           |                      |");
    println!("| Yellow  | Row highlight | RowByRow               | Current row          |");
    println!("| Cyan    | Tile + border | ActorBased             | Active tile          |");
    println!();

    // ========== Teaching Tips ==========
    println!("--- Teaching Tips ---\n");
    println!("For presentations, try this progression:\n");
    println!("1. Start with Cell-by-Cell to show sequential baseline");
    println!("2. Switch to Row-by-Row to demonstrate vectorization speedup");
    println!("3. Show Chaotic Parallel - notice the visual artifacts!");
    println!("4. Demonstrate Synchronized Parallel - correct but has pauses");
    println!("5. End with Actor-Based - smooth AND correct\n");

    // ========== How to Run ==========
    println!("--- Running the Interactive GUI ---\n");
    println!("To see these modes in action with visual feedback:\n");
    println!("  cargo run -p ringkernel-wavesim --bin wavesim --release\n");
    println!("In the GUI:");
    println!("  1. Select mode from 'Simulation Mode' dropdown");
    println!("  2. Click 'Play' to start simulation");
    println!("  3. Watch the colored indicators showing processing patterns");
    println!("  4. Use 'Step' for frame-by-frame observation\n");

    println!("=== Educational Modes Example Complete! ===");
}
