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ZeroSpace/.junie/plans/galaxy-map-json-download.md
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Requirements

Overview & Goals

Add a "Download JSON" button to the interactive Galaxy Map in ZeroSpace.Web that exports all data powering the galaxy map into a structured, downloadable JSON file (galaxy-map-data.json). The exported data will include all planetary systems with their full metadata and Markdown bodies, system masteries with their bonuses and notes, and planetary mastery items.

Scope

  • In Scope:
    • A client-side browser file download utility via Blazor IJSRuntime.
    • Aggregation and serialization of StarSystems.All (including all markdown notes in Body), SystemMasteries.All, and PlanetaryMasteryItems.All.
    • A "Download JSON" button styled with the project's Sci-Fi theme in ZeroSpace.Web/Pages/Galaxy.razor.
  • Out of Scope:
    • Backend API changes (the export is generated client-side from the static/in-memory data models already present in Blazor WebAssembly).
    • Editing or mutating star system data.

User Stories

  • As a player / community developer, I want to download all galaxy map data (including star systems, hyperlane connections, occupation buffs, masteries, and markdown notes) in JSON format from the Galaxy Map page so that I can analyze the data offline, create custom tooling, or reference game lore.

Functional Requirements

  1. Download Action: Clicking the "Download JSON" button generates and initiates a browser download of galaxy-map-data.json.
  2. Star System Data & Markdown: The JSON output must contain all star systems from StarSystems.All including ID, name, category, owner, yield flags, occupation buff, system mastery, connected systems, coordinates, and full markdown text (Body).
  3. Mastery Data: The JSON output must contain all system masteries from SystemMasteries.All (levels, available systems, stats, and markdown body) and planetary mastery items from PlanetaryMasteryItems.All.
  4. JSON Formatting: The output JSON must be well-formatted (indented, camelCase property naming, string representations for enums).
  5. UI Integration: The button must be positioned intuitively in the Galaxy header / control bar matching the existing glassmorphic Sci-Fi styling.

Non-Functional Requirements

  • Performance: Export generation and download initiation should take < 50ms without blocking UI interactions.
  • Offline / WebAssembly Compatibility: The export must function entirely within the client-side Blazor WebAssembly runtime without requiring server endpoints.

Technical Design

Current Implementation

  • ZeroSpace.Web/Pages/Galaxy.razor: The interactive galaxy map page displaying star systems, hyperlanes, and faction occupation details using StarSystems.All and SystemMasteries.All.
  • ZeroSpace.Model/StarSystemData.cs & StarSystems.g.cs: Contains StarSystemData records where Body contains the planetary system Markdown notes.
  • ZeroSpace.Model/SystemMasteryData.cs & SystemMasteries.g.cs: Contains SystemMasteryData records with mastery levels, system associations, stats, and markdown Body.
  • ZeroSpace.Model/PlanetaryMasteryItemData.cs & PlanetaryMasteryItems.g.cs: Contains PlanetaryMasteryItemData records for mastery items.

Key Decisions

  1. Client-Side Export: Use Blazor WebAssembly's IJSRuntime with a lightweight browser Blob URL helper to trigger file download instantly in memory without backend roundtrips.
  2. Unified Data Structure: Group data under top-level properties (systems, masteries, planetaryMasteryItems, exportedAt) for easy consumption by external tools.
  3. Formatting: Use System.Text.Json with JsonSerializerOptions configured for WriteIndented = true, PropertyNamingPolicy = JsonNamingPolicy.CamelCase, and JsonStringEnumConverter.

Proposed Changes

  1. File Download Helper:
    • Add ZeroSpace.Web/wwwroot/js/fileDownload.js containing downloadFileFromText(fileName, contentType, textContent).
    • Include script reference in ZeroSpace.Web/wwwroot/index.html.
  2. Export Model:
    • Define GalaxyMapExportData record containing IReadOnlyList<StarSystemData> Systems, IReadOnlyList<SystemMasteryData> Masteries, IReadOnlyList<PlanetaryMasteryItemData> PlanetaryMasteryItems, and DateTimeOffset ExportedAt.
  3. Galaxy Page Update:
    • Add a "Download JSON" button to the header action bar in Galaxy.razor.
    • Add DownloadJsonAsync() method in @code section that builds GalaxyMapExportData, serializes to JSON, and calls the JS helper.

Data Models / Contracts

public sealed record GalaxyMapExportData(
    DateTimeOffset ExportedAt,
    int TotalSystems,
    int TotalMasteries,
    IReadOnlyList<StarSystemData> Systems,
    IReadOnlyList<SystemMasteryData> Masteries,
    IReadOnlyList<PlanetaryMasteryItemData> PlanetaryMasteryItems);

Architecture Diagram

graph LR
    User[User clicks Download JSON] --> Razor[Galaxy.razor]
    Razor --> Aggregator[Aggregate StarSystems, Masteries, Items]
    Aggregator --> Serializer[System.Text.Json Serializer]
    Serializer --> JSInterop[IJSRuntime downloadFileFromText]
    JSInterop --> Browser[Browser saves galaxy-map-data.json]

File Structure

  • ZeroSpace.Web/wwwroot/js/fileDownload.js (new)
  • ZeroSpace.Web/wwwroot/index.html (modified to include script tag)
  • ZeroSpace.Web/Models/GalaxyMapExportData.cs (new)
  • ZeroSpace.Web/Pages/Galaxy.razor (modified to add download button and handler)
  • ZeroSpace.Web/Pages/Galaxy.razor.css (optional style tweaks for button layout)

Risks

  • Large Payload / Memory: The total size of all systems and markdown is < 500 KB, which fits easily in browser memory for Blob generation.

Testing

Validation Approach

  • Verify solution builds with 0 errors via build_solution_start and build_solution_state.
  • Verify the serialized JSON structure against required fields (star system metadata, markdown Body, masteries, levels, stats).
  • Verify the button UI placement, styling, and JSInterop invocation logic.

Key Scenarios

  1. Download Button Interaction: User clicks the "Download JSON" button on /galaxy.
    • Expected: downloadFileFromText JSInterop is called with galaxy-map-data.json, application/json, and the formatted JSON string.
  2. JSON Content Completeness:
    • Every star system from StarSystems.All is present in the systems array.
    • The markdown body field of each star system is included.
    • Every mastery from SystemMasteries.All is present in the masteries array with levels and stats.
    • Planetary mastery items from PlanetaryMasteryItems.All are included.

Edge Cases

  • Systems with empty vs populated markdown Body serialize properly as strings ("" or markdown text).
  • Enum values (StarSystemCategory) serialize cleanly as strings (e.g. "homeworldSystem", "coreSystem", "sideSystem" or PascalCase).

Delivery Steps

✓ Step 1: Implement file download JSInterop helper and export serialization model

Create the file download JSInterop utility and the galaxy map data export serialization contract.

  • Add a JavaScript file download helper (ZeroSpace.Web/wwwroot/js/fileDownload.js or equivalent) that accepts filename, content type, and content/bytes, creating an object URL blob and triggering a download anchor click.
  • Reference the script in ZeroSpace.Web/wwwroot/index.html.
  • Define an export container record (e.g., GalaxyMapExportData) in ZeroSpace.Web / ZeroSpace.Model that aggregates star systems (with full metadata and markdown Body), system masteries (with levels, stats, available systems, and Body), and planetary mastery items.
  • Implement a JSON serialization helper/service configured with JsonSerializerOptions (WriteIndented = true, camelCase naming, JsonStringEnumConverter) for clean formatting.

✓ Step 2: Integrate Download JSON button and handler into the Galaxy Map page

Add the Download JSON button to the Galaxy Map page and wire up the export trigger.

  • Add the "Download JSON" button in the top action bar of ZeroSpace.Web/Pages/Galaxy.razor next to the map legend/stats controls.
  • Apply consistent Sci-Fi design system styling (btn-scifi-outline with appropriate icon/label) in Galaxy.razor and Galaxy.razor.css.
  • Inject IJSRuntime in Galaxy.razor and implement the DownloadGalaxyJsonAsync event handler to generate the export payload and trigger the client-side download named galaxy-map-data.json.
  • Build the solution and verify clean compilation without errors or warnings.
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