import { expect, test } from '@playwright/test';
import { jumpToFreshSystem } from './helpers';

// Mirrors the /api/world + /api/system response shapes (lib/game/save.ts) — kept local so the spec stays self-contained.
interface WorldSystemDto { id: number; name: string; x: number; y: number; discovered: boolean; current: boolean }
interface WorldState { systems: WorldSystemDto[]; edges: [number, number][]; turn: number }
interface PlanetDto { id: number; name: string; type: string; hazard: boolean; explored: boolean; parent: number | null }
interface InventoryItemDto { kind: string; name: string; qty: number }
interface SystemState { systemId: number; systemName: string; planets: PlanetDto[]; inventory: InventoryItemDto[]; turn: number }
interface FoundItem { kind: string; name: string; qty: number }
interface ExploreResult extends SystemState { outcome: FoundItem[]; crewFound: unknown }
interface CrewDto { id: number; name: string; role: string; traitGood: string; traitBad: string; origin: string }
interface ShipSystemDto { id: number; type: string; level: number; capacity: number; built: boolean }
interface ShipState { systems: ShipSystemDto[]; inventory: InventoryItemDto[]; turn: number }
interface MissionDto { id: number; type: string; description: string; targetSystemId: number | null; conditionKind: string | null; progressTarget: number; progress: number; rewardKind: string; rewardQty: number; state: string }

const totalQty = (items: InventoryItemDto[], kind: string) => items.filter((i) => i.kind === kind).reduce((sum, i) => sum + i.qty, 0);

// BFS over the undirected jump routes — [next, ..., target], empty when already there.
const shortestJumpPath = (fromId: number, toId: number, edges: [number, number][]): number[] => {
  const adj = new Map<number, number[]>();
  for (const [a, b] of edges) {
    if (!adj.has(a)) adj.set(a, []);
    if (!adj.has(b)) adj.set(b, []);
    adj.get(a)!.push(b);
    adj.get(b)!.push(a);
  }
  const prev = new Map<number, number>();
  const seen = new Set([fromId]);
  const queue = [fromId];
  while (queue.length > 0 && !seen.has(toId)) {
    const cur = queue.shift()!;
    for (const next of adj.get(cur) ?? []) {
      if (!seen.has(next)) {
        seen.add(next);
        prev.set(next, cur);
        queue.push(next);
      }
    }
  }
  expect(seen.has(toId)).toBe(true); // the world graph is connected by construction
  const path: number[] = [];
  for (let cur = toId; cur !== fromId; cur = prev.get(cur)!) {
    path.unshift(cur);
  }
  return path;
};

test('landing page loads with the SpaceWanderer title', async ({ page }) => {
  await page.goto('/');
  await expect(page.getByRole('heading', { name: 'SpaceWanderer' })).toBeVisible();
});

test('game template tabs render (scificn-ui component layer wired in)', async ({ page }) => {
  await page.goto('/');
  // Stat card + footer badge prove the layout shell; Radix Tabs.Trigger renders role="tab".
  await expect(page.getByText('NEXT ENCOUNTER')).toBeVisible();
  await expect(page.getByRole('tab', { name: 'WORLD MAP' })).toBeVisible();
  await expect(page.getByRole('tab', { name: 'CREW' })).toBeVisible();
  await expect(page.getByRole('tab', { name: 'SKILL TREE' })).toBeVisible();
  await expect(page.getByText('SYS ONLINE')).toBeVisible();
});

test('tabs switch panels client-side (event log terminal)', async ({ page }) => {
  await page.goto('/');
  await page.getByRole('tab', { name: 'EVENT LOG' }).click();
  await expect(page.getByText('SHIP LOG // PLACEHOLDER FEED')).toBeVisible();
});

test('world map shows the generated starting system and its neighbours', async ({ page }) => {
  await page.goto('/');
  // Live chart title carries the turn counter; a fresh save sits at the start with six jump routes.
  await expect(page.getByText(/GALACTIC CHART \/\/ JUMP ROUTES — TURN \d+/)).toBeVisible();
  const jumpButtons = page.getByRole('button', { name: /\/\/ JUMP$/ });
  await expect(jumpButtons.first()).toBeVisible();
  await expect(jumpButtons).toHaveCount(6);
});

test('jumping to an adjacent system updates the world state and turn counter', async ({ page }) => {
  const before = (await (await page.request.get('/api/world')).json()) as WorldState;
  const currentId = before.systems.find((s) => s.current)!.id;
  const edge = before.edges.find(([a, b]) => a === currentId || b === currentId)!;
  const targetId = edge[0] === currentId ? edge[1] : edge[0];
  const targetName = before.systems.find((s) => s.id === targetId)!.name;

  await page.goto('/');
  await page.getByRole('button', { name: `${targetName.toUpperCase()} // JUMP` }).click();

  const after = (await (await page.request.get('/api/world')).json()) as WorldState;
  expect(after.turn).toBe(before.turn + 1);
  expect(after.systems.find((s) => s.current)?.id).toBe(targetId);
});

test('local system shows the current system bodies with staggered moons and explore buttons', async ({ page }) => {
  const sys = (await (await page.request.get('/api/system')).json()) as SystemState;

  await page.goto('/');
  await page.getByRole('tab', { name: 'LOCAL SYSTEM' }).click();

  // Header carries the real system name + turn counter.
  await expect(page.getByText(`EXPLORABLE WORLDS // ${sys.systemName.toUpperCase()} — TURN ${sys.turn}`)).toBeVisible();
  // One EXPLORE button per unexplored body (planets and moons alike).
  const exploreButtons = page.getByRole('button', { name: /\/\/ EXPLORE$/ });
  await expect(exploreButtons.first()).toBeVisible();
  await expect(exploreButtons).toHaveCount(sys.planets.filter((p) => !p.explored).length);
});

test('exploring a body flips its row state, bumps the turn and shows the scan result', async ({ page }) => {
  const before = (await (await page.request.get('/api/system')).json()) as SystemState;
  const target = before.planets.find((p) => !p.explored)!;

  await page.goto('/');
  await page.getByRole('tab', { name: 'LOCAL SYSTEM' }).click();
  await page.getByRole('button', { name: `${target.name.toUpperCase()} // EXPLORE` }).click();

  const after = (await (await page.request.get('/api/system')).json()) as SystemState;
  expect(after.turn).toBe(before.turn + 1);
  expect(after.planets.find((p) => p.id === target.id)?.explored).toBe(true);

  // UI reflects it: the row badge flipped to SCANNED and its EXPLORE button is gone.
  await expect(page.getByRole('button', { name: `${target.name.toUpperCase()} // EXPLORE` })).toHaveCount(0);
  await expect(page.getByText(/SCAN RESULT \/\/ /)).toBeVisible();
});

test('exploration yields finds that accumulate in the inventory', async ({ page }) => {
  // Scan bodies until one yields something (most scans do; jumping keeps it going if a whole
  // system is exhausted). P(no find across this many scans) ≈ 0.21^30 — negligible.
  const found = new Map<string, number>(); // kind|name -> qty
  let iterations = 0;
  while (found.size === 0 && iterations < 60) {
    iterations++;
    const sys = (await (await page.request.get('/api/system')).json()) as SystemState;
    const unexplored = sys.planets.filter((p) => !p.explored);
    if (unexplored.length > 0) {
      const res = await page.request.post('/api/explore', { data: { planetId: unexplored[0].id } });
      expect(res.status()).toBe(200);
      for (const item of ((await res.json()) as ExploreResult).outcome) {
        found.set(`${item.kind}|${item.name}`, item.qty);
      }
    } else {
      // Current system fully scanned — jump somewhere and keep scanning.
      const world = (await (await page.request.get('/api/world')).json()) as WorldState;
      const currentId = world.systems.find((s) => s.current)!.id;
      const edge = world.edges.find(([a, b]) => a === currentId || b === currentId)!;
      const targetId = edge[0] === currentId ? edge[1] : edge[0];
      expect((await page.request.post('/api/jump', { data: { systemId: targetId } })).status()).toBe(200);
    }
  }
  expect(found.size).toBeGreaterThan(0);

  // Every find landed in the inventory with at least that qty.
  const sys = (await (await page.request.get('/api/system')).json()) as SystemState;
  for (const [key, qty] of found) {
    const [kind, name] = key.split('|');
    expect(sys.inventory.find((i) => i.kind === kind && i.name === name)?.qty).toBeGreaterThanOrEqual(qty);
  }
});

test('CREW tab renders real roster cards, each showing both traits and an origin', async ({ page }) => {
  const roster = (await (await page.request.get('/api/crew')).json()) as CrewDto[];
  expect(roster.length).toBeGreaterThanOrEqual(2); // starting crew is always seeded

  await page.goto('/');
  await page.getByRole('tab', { name: 'CREW' }).click();

  for (const member of roster) {
    const heading = page.getByRole('heading', { name: member.name });
    await expect(heading).toBeVisible();
    // The card is the third div ancestor of the title (flex row → CardHeader → Card).
    const card = heading.locator('xpath=ancestor::div[3]');
    await expect(card.getByText(member.role)).toBeVisible();
    await expect(card.getByText(member.traitGood)).toBeVisible();
    await expect(card.getByText(member.traitBad)).toBeVisible();
    await expect(card.getByText(`ORIGIN // ${member.origin.toUpperCase()}`)).toBeVisible();
  }
});

test('SHIP SYSTEMS tab performs an affordable action and reflects it in the card and left column', async ({ page }) => {
  // Scan bodies until something is affordable: an upgrade costs `level` resources (at least one),
  // a build costs three parts. Jumping keeps it going if a whole system is exhausted.
  let ship = (await (await page.request.get('/api/ship')).json()) as ShipState;
  const upgradeTarget = () => ship.systems.find((s) => s.built && s.level < 5 && totalQty(ship.inventory, 'resource') >= s.level);
  // WEAPONS is gated behind the unresearched WEAPONS SYSTEMS tech — its build path is covered by
  // the research test below, so this one only targets ungated types.
  const buildTarget = () => (totalQty(ship.inventory, 'part') >= 3 ? ship.systems.find((s) => !s.built && s.type !== 'WEAPONS') : undefined);

  let iterations = 0;
  while (!upgradeTarget() && !buildTarget() && iterations < 60) {
    iterations++;
    const sys = (await (await page.request.get('/api/system')).json()) as SystemState;
    const unexplored = sys.planets.filter((p) => !p.explored);
    if (unexplored.length > 0) {
      expect((await page.request.post('/api/explore', { data: { planetId: unexplored[0].id } })).status()).toBe(200);
    } else {
      const world = (await (await page.request.get('/api/world')).json()) as WorldState;
      const currentId = world.systems.find((s) => s.current)!.id;
      const edge = world.edges.find(([a, b]) => a === currentId || b === currentId)!;
      const targetId = edge[0] === currentId ? edge[1] : edge[0];
      expect((await page.request.post('/api/jump', { data: { systemId: targetId } })).status()).toBe(200);
    }
    ship = (await (await page.request.get('/api/ship')).json()) as ShipState;
  }

  const upgrade = upgradeTarget();
  const build = !upgrade ? buildTarget() : undefined;
  expect(upgrade ?? build).toBeDefined(); // the bounded scan always finds something to spend on

  await page.goto('/');
  await page.getByRole('tab', { name: 'SHIP SYSTEMS' }).click();

  if (upgrade) {
    const card = page.getByRole('heading', { name: upgrade.type }).locator('xpath=ancestor::div[3]');
    await expect(card.getByRole('button', { name: 'UPGRADE' })).toBeEnabled();
    await card.getByRole('button', { name: 'UPGRADE' }).click();

    const after = (await (await page.request.get('/api/ship')).json()) as ShipState;
    const row = after.systems.find((s) => s.id === upgrade.id)!;
    expect(row.level).toBe(upgrade.level + 1);
    expect(after.turn).toBe(ship.turn + 1);

    // The card badge flipped to the new level and the left column mirrors it.
    await expect(card.getByText(`LV ${upgrade.level + 1}`)).toBeVisible();
    await expect(page.getByText(`LV ${row.level} · CAP ${row.capacity}`)).toBeVisible();
  } else {
    const target = build!;
    const card = page.getByRole('heading', { name: target.type }).locator('xpath=ancestor::div[3]');
    await expect(card.getByRole('button', { name: 'BUILD NEW' })).toBeEnabled();
    await card.getByRole('button', { name: 'BUILD NEW' }).click();

    const after = (await (await page.request.get('/api/ship')).json()) as ShipState;
    const row = after.systems.find((s) => s.id === target.id)!;
    expect(row.built).toBe(true);
    expect({ level: row.level, capacity: row.capacity }).toEqual({ level: 1, capacity: 2 });

    // The card badge flipped OFFLINE → LV 1 and the left column's online count went up.
    await expect(card.getByText('LV 1')).toBeVisible();
    await expect(page.getByText(`${after.systems.filter((s) => s.built).length} ONLINE`)).toBeVisible();
  }
});

test('SKILL TREE tab researches WEAPONS SYSTEMS and unlocks the gated WEAPONS build', async ({ page }) => {
  // Research costs two parts, building WEAPONS three — scan until the hold has five. Parts drop on
  // ~30% of scans, so P(<5 in 80 scans) is negligible; jumping keeps it going if a system exhausts.
  let ship = (await (await page.request.get('/api/ship')).json()) as ShipState;
  let iterations = 0;
  while (totalQty(ship.inventory, 'part') < 5 && iterations < 80) {
    iterations++;
    const sys = (await (await page.request.get('/api/system')).json()) as SystemState;
    const unexplored = sys.planets.filter((p) => !p.explored);
    if (unexplored.length > 0) {
      expect((await page.request.post('/api/explore', { data: { planetId: unexplored[0].id } })).status()).toBe(200);
    } else {
      await jumpToFreshSystem(page); // prefer undiscovered territory — first-edge ping-pongs between exhausted systems
    }
    ship = (await (await page.request.get('/api/ship')).json()) as ShipState;
  }
  expect(totalQty(ship.inventory, 'part')).toBeGreaterThanOrEqual(5);

  await page.goto('/');

  // SHIP SYSTEMS tab: BUILD NEW on WEAPONS is disabled — gated behind the unresearched tech.
  await page.getByRole('tab', { name: 'SHIP SYSTEMS' }).click();
  const weaponsCard = page.getByRole('heading', { name: 'WEAPONS' }).locator('xpath=ancestor::div[3]');
  await expect(weaponsCard.getByText('REQUIRES // WEAPONS SYSTEMS')).toBeVisible();
  await expect(weaponsCard.getByRole('button', { name: 'BUILD NEW' })).toBeDisabled();

  // SKILL TREE tab: research WEAPONS SYSTEMS (two parts) — the card flips to RESEARCHED.
  await page.getByRole('tab', { name: 'SKILL TREE' }).click();
  const techCard = page.getByRole('heading', { name: 'WEAPONS SYSTEMS' }).locator('xpath=ancestor::div[3]');
  await expect(techCard.getByText('AVAILABLE')).toBeVisible(); // root tech — no prerequisites
  await expect(techCard.getByRole('button', { name: 'RESEARCH' })).toBeEnabled(); // parts ≥ 2
  const turnBefore = ship.turn;
  await techCard.getByRole('button', { name: 'RESEARCH' }).click();
  await expect(techCard.getByText('RESEARCHED')).toBeVisible();

  const afterResearch = (await (await page.request.get('/api/ship')).json()) as ShipState;
  expect(afterResearch.turn).toBe(turnBefore + 1); // research costs a turn

  // The gated ship action is now available: BUILD NEW on WEAPONS flips to enabled and builds.
  await page.getByRole('tab', { name: 'SHIP SYSTEMS' }).click();
  await expect(weaponsCard.getByRole('button', { name: 'BUILD NEW' })).toBeEnabled();
  await weaponsCard.getByRole('button', { name: 'BUILD NEW' }).click();

  const afterBuild = (await (await page.request.get('/api/ship')).json()) as ShipState;
  expect(afterBuild.systems.find((s) => s.type === 'WEAPONS')!.built).toBe(true);
  await expect(weaponsCard.getByText('LV 1')).toBeVisible();
});

test('MISSIONS tab accepts a contract and completing it grants the reward', async ({ page }) => {
  const board = (await (await page.request.get('/api/missions')).json()) as MissionDto[];
  expect(board.filter((m) => m.state === 'AVAILABLE').length).toBeGreaterThanOrEqual(3); // the board is always topped up

  await page.goto('/');
  await page.getByRole('tab', { name: 'MISSIONS' }).click();
  const acceptButtons = page.getByRole('button', { name: 'ACCEPT' });
  const panel = page.getByRole('tabpanel');

  // Idempotent across retries sharing a DB: if a previous attempt already accepted a mission, it's still
  // ACTIVE and every ACCEPT button is disabled — complete that one instead of accepting again.
  const leftover = board.find((m) => m.state === 'ACTIVE');
  let picked: MissionDto;

  if (leftover) {
    picked = leftover;
    // No exact match — ACTIVE badges render a "●" dot prefix (components/ui/badge.tsx), so their text is "●ACTIVE".
    await expect(panel.getByText('ACTIVE')).toBeVisible();
    for (const button of await acceptButtons.all()) {
      await expect(button).toBeDisabled();
    }
  } else {
    // Prefer a scan-completable contract — fresh boards are all EXPLORE/FIND (DELIVER only appears once systems are discovered).
    picked = board.find((m) => m.state === 'AVAILABLE' && m.type !== 'DELIVER') ?? board.find((m) => m.state === 'AVAILABLE')!;
    const idx = board.indexOf(picked);

    // One ACCEPT button per card, in board order — the picked contract's is enabled (AVAILABLE, nothing active).
    await expect(acceptButtons.nth(idx)).toBeEnabled();
    await acceptButtons.nth(idx).click();

    // UI flipped: exactly one ACTIVE badge on the board and the accepted card's button is now disabled.
    // No exact match — ACTIVE badges render a "●" dot prefix (components/ui/badge.tsx), so their text is "●ACTIVE".
    await expect(panel.getByText('ACTIVE')).toBeVisible();
    await expect(acceptButtons.nth(idx)).toBeDisabled();

    // API confirms it: exactly one ACTIVE mission, the picked one (accepting cost a turn).
    const boardAfterAccept = (await (await page.request.get('/api/missions')).json()) as MissionDto[];
    expect(boardAfterAccept.filter((m) => m.state === 'ACTIVE')).toEqual([boardAfterAccept.find((m) => m.id === picked.id)!]);
  }

  // Baseline of the reward kind in the hold — scans during completion may add more, so assert >=.
  const shipBefore = (await (await page.request.get('/api/ship')).json()) as ShipState;
  const baseline = totalQty(shipBefore.inventory, picked.rewardKind);

  // Complete it. EXPLORE/FIND: scan until done, jumping when a system exhausts (parts drop on ~30% of
  // scans, so P(a FIND-part misses in 80 scans) ≈ 0.7^80 — negligible). DELIVER: follow the shortest
  // jump path to its target (edges only ever get added, so the precomputed path stays valid).
  let deliverPath: number[] = [];
  if (picked.type === 'DELIVER') {
    const worldNow = (await (await page.request.get('/api/world')).json()) as WorldState;
    deliverPath = shortestJumpPath(worldNow.systems.find((s) => s.current)!.id, picked.targetSystemId!, worldNow.edges);
  }

  let state = 'ACTIVE';
  let iterations = 0;
  while (state !== 'DONE' && iterations < 80) {
    iterations++;
    if (deliverPath.length > 0) {
      expect((await page.request.post('/api/jump', { data: { systemId: deliverPath.shift()! } })).status()).toBe(200);
    } else {
      const sys = (await (await page.request.get('/api/system')).json()) as SystemState;
      const unexplored = sys.planets.filter((p) => !p.explored);
      if (unexplored.length > 0) {
        expect((await page.request.post('/api/explore', { data: { planetId: unexplored[0].id } })).status()).toBe(200);
      } else {
        await jumpToFreshSystem(page); // prefer undiscovered territory — first-edge ping-pongs between exhausted systems
      }
    }
    state = ((await (await page.request.get('/api/missions')).json()) as MissionDto[]).find((m) => m.id === picked.id)?.state ?? 'ACTIVE';
  }
  expect(state).toBe('DONE'); // the bounded loop always completes: scans are plentiful, jump paths finite

  const shipAfter = (await (await page.request.get('/api/ship')).json()) as ShipState;
  expect(totalQty(shipAfter.inventory, picked.rewardKind)).toBeGreaterThanOrEqual(baseline + picked.rewardQty);
});

test('GET /api/version reports the app version as JSON', async ({ page }) => {
  const res = await page.request.get('/api/version');
  expect(res.status()).toBe(200);
  expect(res.headers()['content-type']).toContain('application/json');
  const body = (await res.json()) as { version: string };
  expect(body.version).toMatch(/^\d+\.\d+\.\d+$/);
});