import assert from "node:assert/strict";
import crypto from "node:crypto";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { spawnSync } from "node:child_process";
import { fileURLToPath } from "node:url";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
const manifestPath = path.join(root, "tests/golden/M12-06C/manifest.json");
const reportPath = path.join(root, "tests/golden/M12-06C/desktop-main-report.json");
const fixtureReportPath = path.join(root, "tests/golden/M12-06A/desktop-fixtures.json");
const fixtureRoot = path.join(root, "tests/files/web/m12_glb_desktop_v1");
const generator = path.join(root, "tools/web/generate-glb-main-persistence-fixtures.py");
const blender = process.env.BLENDER_BIN ?? path.join(root, "build_blender_5.2.0/bin/blender");

const read = (file) => fs.readFileSync(file);
const readJson = (file) => JSON.parse(read(file));
const sha256 = (bytes) => crypto.createHash("sha256").update(bytes).digest("hex");
const fileHash = (file) => sha256(read(file));

const manifest = readJson(manifestPath);
const report = readJson(reportPath);
const fixtureReport = readJson(fixtureReportPath);

assert.deepEqual(
  { schemaVersion: manifest.schemaVersion, task: manifest.task, parentTask: manifest.parentTask, nextTask: manifest.nextTask },
  { schemaVersion: 1, task: "M12-06C", parentTask: "M12-06B", nextTask: "M12-06D" },
);
assert.deepEqual(
  { schemaVersion: report.schemaVersion, task: report.task, operation: report.operation, fixtureCount: report.fixtureCount, nextTask: report.nextTask },
  { schemaVersion: 1, task: "M12-06C", operation: "DESKTOP_GLB_IMPORT_MAIN_PERSISTENCE_BASELINE", fixtureCount: 5, nextTask: "M12-06D" },
);
assert.equal(fileHash(path.join(root, "tests/golden/M12-06B/manifest.json")), manifest.artifacts.parentManifest.sha256);

for (const artifact of Object.values(manifest.artifacts)) {
  const file = path.join(root, artifact.path);
  assert.ok(fs.existsSync(file), `missing M12-06C artifact ${artifact.path}`);
  assert.equal(fileHash(file), artifact.sha256, `hash mismatch ${artifact.path}`);
}

const fixtureById = new Map(fixtureReport.fixtures.map((fixture) => [fixture.id, fixture]));
assert.deepEqual(report.fixtures.map((fixture) => fixture.id), ["mesh", "pbr", "uv", "skin", "animation"]);
for (const fixture of report.fixtures) {
  const source = fixtureById.get(fixture.id);
  assert.ok(source, `${fixture.id} is absent from M12-06A`);
  assert.equal(fixture.glb.sha256, source.sha256, `${fixture.id} GLB source drift`);
  assert.equal(fileHash(path.join(fixtureRoot, fixture.glb.file)), fixture.glb.sha256, `${fixture.id} GLB hash`);
  const blend = path.join(fixtureRoot.replace("m12_glb_desktop_v1", "m12_glb_main_v1"), fixture.blend.file);
  assert.equal(fs.statSync(blend).size, fixture.blend.byteLength, `${fixture.id} desktop Main fixture byte length`);
  assert.equal(fileHash(blend), fixture.blend.sha256, `${fixture.id} desktop Main fixture hash`);
  assert.deepEqual(fixture.graph.stableIds, {
    objects: [...fixture.graph.stableIds.objects].sort(),
    meshes: [...fixture.graph.stableIds.meshes].sort(),
    materials: [...fixture.graph.stableIds.materials].sort(),
    images: [...fixture.graph.stableIds.images].sort(),
    armatures: [...fixture.graph.stableIds.armatures].sort(),
    actions: [...fixture.graph.stableIds.actions].sort(),
  });
  for (const [kind, ids] of Object.entries(fixture.graph.stableIds)) {
    assert.equal(new Set(ids).size, ids.length, `${fixture.id} duplicate ${kind} stable ID`);
    const prefix = { objects: "object:", meshes: "mesh:", materials: "material:", images: "image:", armatures: "armature:", actions: "action:" }[kind];
    assert.ok(ids.every((id) => id.startsWith(prefix)), `${fixture.id} malformed ${kind} stable ID`);
  }
}

const normalizeReport = (value) => ({
  blenderVersion: value.blenderVersion,
  fixtureCount: value.fixtureCount,
  nextTask: value.nextTask,
  operation: value.operation,
  schemaVersion: value.schemaVersion,
  fixtures: value.fixtures.map((fixture) => ({
    id: fixture.id,
    glb: fixture.glb,
    graph: fixture.graph,
  })),
});

const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "m12-06c-main-persistence-"));
try {
  const outputRoot = path.join(temporary, "main");
  const regeneratedReport = path.join(temporary, "desktop-main-report.json");
  const result = spawnSync(blender, ["-b", "--factory-startup", "--python", generator, "--", fixtureRoot, outputRoot, regeneratedReport], {
    cwd: root,
    encoding: "utf8",
    maxBuffer: 20 * 1024 * 1024,
  });
  assert.equal(result.status, 0, `${result.stdout}\n${result.stderr}`);
  const regenerated = readJson(regeneratedReport);
  assert.deepEqual(normalizeReport(regenerated), normalizeReport(report), "desktop Main semantic report is not deterministic");
  for (const fixture of regenerated.fixtures) {
    assert.ok(fs.statSync(path.join(outputRoot, fixture.blend.file)).size > 0, `${fixture.id} regenerated .blend is empty`);
    assert.deepEqual(fixture.graph.stableIds, report.fixtures.find((item) => item.id === fixture.id).graph.stableIds, `${fixture.id} stable IDs drifted`);
  }
} finally {
  fs.rmSync(temporary, { recursive: true, force: true });
}

process.stdout.write(`glb-main-persistence-ok fixtures=${report.fixtureCount} stableIds=exact desktopReopen=exact deterministic=true next=${manifest.nextTask}\n`);