import { Hono } from 'hono'
import { nanoid } from 'nanoid'
import { createHash, randomBytes } from 'crypto'
import { db, schema } from '../db/index.js'
import { eq, sql } from 'drizzle-orm'
import { isAllowedWebhookUrl } from '../engine/orchestrator.js'
import { validateCustomization } from '../engine/customization.js'
import { testWebhook } from '../engine/webhook-test.js'
import { rateLimit } from '../middleware/rate-limit.js'
import { isCreatorPubkey } from '../lib/constants.js'
import { loginSchema, registerSchema, registerHumanSchema, updateBotSchema, pubkeySchema, formatZodError } from '../lib/validators.js'
import { extractPubkeyFromAuth } from '../middleware/jwt.js'

export const authRouter = new Hono()

// Check name availability
authRouter.get("/check-name/:name", async (c) => {
  const name = c.req.param("name")?.trim().toLowerCase()
  if (!name || name.length < 2 || name.length > 12) {
    return c.json({ available: false, error: "Name must be 2-12 characters." })
  }
  const existing = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(sql`LOWER(${schema.bots.name})`, name))
    .limit(1)
  return c.json({ available: existing.length === 0 })
})

// GET /me — restore the caller's own identity from their JWT alone.
// This is the ONLY session-restore path: it derives the pubkey from a
// verified, non-expired, non-blacklisted Bearer token (extractPubkeyFromAuth
// delegates to verifyJwt, which covers all of those cases) and never trusts
// a client-claimed pubkey. Read-only — performs no writes of any kind.
// Covered by global /api/* rate limiting (see app.ts); no per-route limiter
// needed for a session-restore call issued on every page load.
authRouter.get('/me', async (c) => {
  const pubkey = extractPubkeyFromAuth(c.req.header('Authorization'))
  if (!pubkey) {
    return c.json({ error: 'Authentication required.' }, 401)
  }

  const rows = await db.select({
    id: schema.bots.id,
    name: schema.bots.name,
    avatarSeed: schema.bots.avatarSeed,
    archetype: schema.bots.archetype,
    profilePicUrl: schema.bots.profilePicUrl,
    eloRating: schema.bots.eloRating,
    wins: schema.bots.wins,
    losses: schema.bots.losses,
    winStreak: schema.bots.winStreak,
    bestStreak: schema.bots.bestStreak,
    tier: schema.bots.tier,
    isActive: schema.bots.isActive,
    customization: schema.bots.customization,
    webhookUrl: schema.bots.webhookUrl,
    satsWon: schema.bots.satsWon,
    satsWagered: schema.bots.satsWagered,
  }).from(schema.bots).where(eq(schema.bots.publicKey, pubkey)).limit(1)

  if (rows.length === 0) {
    return c.json({ exists: false })
  }

  const bot = rows[0]
  const isHuman = bot.webhookUrl === 'http://human.local/'

  return c.json({
    exists: true,
    bot: {
      id: bot.id,
      name: bot.name,
      avatarSeed: bot.avatarSeed,
      archetype: bot.archetype,
      profilePicUrl: bot.profilePicUrl,
      eloRating: bot.eloRating,
      wins: bot.wins,
      losses: bot.losses,
      winStreak: bot.winStreak,
      bestStreak: bot.bestStreak,
      tier: bot.tier,
      isActive: bot.isActive,
      isHuman,
      customization: bot.customization ? JSON.parse(bot.customization) : null,
      satsWon: bot.satsWon ?? 0,
      satsWagered: bot.satsWagered ?? 0,
      hasWallet: false,
    },
  })
})

// DEPRECATED — read-only lookup kept for backward compatibility only.
// This endpoint establishes NO session and issues NO token; it never trusts
// the pubkey it's given beyond looking up an existing row (D-01/BOT-01).
// It used to auto-create/auto-upgrade the creator's bot row on an
// unauthenticated request — that side effect has been removed. The
// identical creator auto-create/auto-upgrade logic runs, correctly gated
// behind NIP-98 signature verification, inside POST /nostr/session; a
// creator who signs in with a real signer still gets the same row
// created/upgraded there. Session establishment lives ONLY in
// POST /nostr/session; session restoration lives ONLY in GET /me.
// Rate limited: 10 per minute per IP.
authRouter.post('/login', rateLimit(60_000, 10), async (c) => {
  const parsed = loginSchema.safeParse(await c.req.json().catch(() => ({})))
  if (!parsed.success) {
    return c.json({ error: 'Invalid pubkey.' }, 400)
  }
  const { pubkey } = parsed.data

  const rows = await db.select({
    id: schema.bots.id,
    name: schema.bots.name,
    avatarSeed: schema.bots.avatarSeed,
    archetype: schema.bots.archetype,
    profilePicUrl: schema.bots.profilePicUrl,
    eloRating: schema.bots.eloRating,
    wins: schema.bots.wins,
    losses: schema.bots.losses,
    winStreak: schema.bots.winStreak,
    bestStreak: schema.bots.bestStreak,
    tier: schema.bots.tier,
    isActive: schema.bots.isActive,
    customization: schema.bots.customization,
    webhookUrl: schema.bots.webhookUrl,
    satsWon: schema.bots.satsWon,
    satsWagered: schema.bots.satsWagered,
  }).from(schema.bots).where(eq(schema.bots.publicKey, pubkey)).limit(1)

  if (rows.length === 0) {
    return c.json({ exists: false, pubkey })
  }

  const bot = rows[0]
  const isHuman = bot.webhookUrl === 'http://human.local/'

  return c.json({
    exists: true,
    bot: {
      id: bot.id,
      name: bot.name,
      avatarSeed: bot.avatarSeed,
      archetype: bot.archetype,
      profilePicUrl: bot.profilePicUrl,
      eloRating: bot.eloRating,
      wins: bot.wins,
      losses: bot.losses,
      winStreak: bot.winStreak,
      bestStreak: bot.bestStreak,
      tier: bot.tier,
      isActive: bot.isActive,
      isHuman,
      customization: bot.customization ? JSON.parse(bot.customization) : null,
      satsWon: bot.satsWon ?? 0,
      satsWagered: bot.satsWagered ?? 0,
      hasWallet: false,
    },
  })
})

// Register a new bot with Nostr pubkey
authRouter.post('/register', rateLimit(600_000, 10), async (c) => {
  const parsed = registerSchema.safeParse(await c.req.json().catch(() => ({})))
  if (!parsed.success) {
    return c.json({ error: formatZodError(parsed.error, {
      pubkey: 'Invalid pubkey.',
      name: 'Name must be 2-12 alphanumeric characters, hyphens, or underscores.',
      webhookUrl: 'webhookUrl must be a valid URL.',
    }, 'Invalid registration data.') }, 400)
  }
  const { pubkey, name, webhookUrl, archetype, profilePicUrl, customization: rawCustomization } = parsed.data

  // Validate customization
  const custResult = validateCustomization(rawCustomization)
  if (!custResult.valid) {
    return c.json({ error: custResult.error }, 400)
  }

  const normalizedName = name.toLowerCase()

  // Poll mode: if no webhookUrl provided, bot will poll for challenges
  const isPollMode = !webhookUrl || webhookUrl === ''

  if (!isPollMode) {
    if (typeof webhookUrl !== 'string') {
      return c.json({ error: 'webhookUrl must be a string.' }, 400)
    }
    try {
      new URL(webhookUrl)
    } catch {
      return c.json({ error: 'webhookUrl must be a valid URL.' }, 400)
    }
    if (!isAllowedWebhookUrl(webhookUrl)) {
      return c.json({ error: 'webhookUrl must not point to private/internal addresses.' }, 400)
    }
  }

  // Check pubkey not already used
  const existingPk = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (existingPk.length > 0) {
    return c.json({ error: 'This Nostr key already has a bot.' }, 409)
  }

  // Check name not taken (case-insensitive)
  const existingName = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(sql`LOWER(${schema.bots.name})`, normalizedName))
    .limit(1)

  if (existingName.length > 0) {
    return c.json({ error: 'A bot with that name already exists.' }, 409)
  }

  // Test the webhook (skip for poll mode)
  let testResult: { latencyMs: number } | null = null
  if (!isPollMode) {
    const result = await testWebhook(webhookUrl)
    if (!result.reachable || !result.validResponse) {
      return c.json({
        error: 'Webhook verification failed.',
        details: result.error || 'Webhook must return {"answer": "..."} as JSON.',
        latencyMs: result.latencyMs,
      }, 422)
    }
    testResult = result
  }

  const id = nanoid(12)
  const secret = randomBytes(32).toString('hex')
  const effectiveWebhookUrl = isPollMode ? 'http://poll.local/' : webhookUrl

  const baseArchetype = custResult.data.archetype || archetype || 'standard'
  const effectiveArchetype = isCreatorPubkey(pubkey) ? 'the_creator' : baseArchetype
  const custJson = Object.keys(custResult.data).length > 0 ? JSON.stringify(custResult.data) : null

  await db.insert(schema.bots).values({
    id,
    name: normalizedName,
    webhookUrl: effectiveWebhookUrl,
    avatarSeed: normalizedName,
    archetype: effectiveArchetype,
    secretHash: createHash('sha256').update(secret).digest('hex'),
    publicKey: pubkey,
    profilePicUrl: profilePicUrl || null,
    customization: custJson,
    createdAt: new Date().toISOString(),
  })

  return c.json({
    id,
    name: normalizedName,
    secret,
    mode: isPollMode ? 'poll' : 'webhook',
    archetype: effectiveArchetype,
    customization: custResult.data,
    webhookLatencyMs: testResult?.latencyMs ?? null,
    message: isPollMode
      ? 'Bot registered in poll mode. No public URL needed. Use GET /api/fights/poll to receive challenges.'
      : 'Bot registered. Webhook verified.',
  }, 201)
})


// Register a human player (no webhook required)
authRouter.post('/register-human', rateLimit(600_000, 10), async (c) => {
  const parsed = registerHumanSchema.safeParse(await c.req.json().catch(() => ({})))
  if (!parsed.success) {
    return c.json({ error: formatZodError(parsed.error, {
      pubkey: 'Invalid pubkey.',
      name: 'Name must be 2-12 alphanumeric characters, hyphens, or underscores.',
    }, 'Invalid registration data.') }, 400)
  }
  const { pubkey, name, profilePicUrl, avatarSeed } = parsed.data

  const normalizedName = name.toLowerCase()

  const existingPk = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (existingPk.length > 0) {
    return c.json({ error: 'This Nostr key already has a fighter.' }, 409)
  }

  const existingName = await db.select({ id: schema.bots.id })
    .from(schema.bots)
    .where(eq(sql`LOWER(${schema.bots.name})`, normalizedName))
    .limit(1)

  if (existingName.length > 0) {
    return c.json({ error: 'That name is already taken.' }, 409)
  }

  const id = nanoid(12)
  const secret = randomBytes(32).toString('hex')

  const humanArchetype = isCreatorPubkey(pubkey) ? 'the_creator' : 'human'

  await db.insert(schema.bots).values({
    id,
    name: normalizedName,
    webhookUrl: 'http://human.local/',
    avatarSeed: avatarSeed || normalizedName,
    archetype: humanArchetype,
    secretHash: createHash('sha256').update(secret).digest('hex'),
    publicKey: pubkey,
    profilePicUrl: profilePicUrl || null,
    customization: null,
    createdAt: new Date().toISOString(),
  })

  return c.json({
    id,
    name: normalizedName,
    archetype: humanArchetype,
    isHuman: true,
    message: 'Human fighter registered.',
  }, 201)
})

// Update bot webhook and/or customization (requires pubkey match)
authRouter.post('/update', rateLimit(60_000, 10), async (c) => {
  const parsed = updateBotSchema.safeParse(await c.req.json().catch(() => ({})))
  if (!parsed.success) {
    return c.json({ error: 'Invalid pubkey.' }, 400)
  }
  const { pubkey, webhookUrl, profilePicUrl, customization: rawCustomization } = parsed.data

  const rows = await db.select({ id: schema.bots.id, customization: schema.bots.customization })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (rows.length === 0) {
    return c.json({ error: 'No bot found for this key.' }, 404)
  }

  const updates: Record<string, unknown> = {}

  if (webhookUrl) {
    if (typeof webhookUrl !== 'string' || webhookUrl.length > 2048) {
      return c.json({ error: 'Invalid webhookUrl.' }, 400)
    }
    if (!isAllowedWebhookUrl(webhookUrl)) {
      return c.json({ error: 'webhookUrl must not point to private/internal addresses.' }, 400)
    }
    const testResult = await testWebhook(webhookUrl)
    if (!testResult.reachable || !testResult.validResponse) {
      return c.json({
        error: 'Webhook verification failed.',
        details: testResult.error,
      }, 422)
    }
    updates.webhookUrl = webhookUrl
    updates.consecutiveErrors = 0
    updates.isActive = true
  }

  if (profilePicUrl) {
    if (typeof profilePicUrl !== 'string' || profilePicUrl.length > 2048 || !/^https?:\/\//.test(profilePicUrl)) {
      return c.json({ error: 'profilePicUrl must be a valid HTTP(S) URL.' }, 400)
    }
    updates.profilePicUrl = profilePicUrl
  }

  if (rawCustomization !== undefined) {
    const custResult = validateCustomization(rawCustomization)
    if (!custResult.valid) {
      return c.json({ error: custResult.error }, 400)
    }
    // Merge with existing customization
    const existing = rows[0].customization ? JSON.parse(rows[0].customization) : {}
    const merged = { ...existing, ...custResult.data }
    updates.customization = JSON.stringify(merged)
    // Update archetype if set in customization (but never override the_creator)
    if (custResult.data.archetype && !isCreatorPubkey(pubkey)) {
      updates.archetype = custResult.data.archetype
    }
  }

  if (Object.keys(updates).length > 0) {
    await db.update(schema.bots).set(updates).where(eq(schema.bots.id, rows[0].id))
  }

  return c.json({ updated: true })
})

// --- NIP-98 Authenticated Session ---
import { verifyNip98Token } from '../middleware/nip98.js'
import { createJwt } from '../middleware/jwt.js'

// POST /nostr/session — authenticate with NIP-98, receive JWT
authRouter.post('/nostr/session', rateLimit(60_000, 10), async (c) => {
  // Extract NIP-98 token from headers (try multiple header names)
  const authHeader = c.req.header('Authorization')
    || c.req.header('nostr-authorization')
    || c.req.header('x-nostr-authorization')

  if (!authHeader) {
    return c.json({ error: 'Missing NIP-98 authorization header' }, 401)
  }

  // Verify the NIP-98 event signature, URL, method, and freshness
  const requestPath = new URL(c.req.url).pathname
  const result = verifyNip98Token(authHeader, requestPath, 'POST')

  if (!result.valid || !result.pubkey) {
    return c.json({ error: result.error || 'NIP-98 verification failed' }, 401)
  }

  const pubkey = result.pubkey

  // Look up bot for this pubkey
  const rows = await db.select({
    id: schema.bots.id,
    name: schema.bots.name,
    avatarSeed: schema.bots.avatarSeed,
    archetype: schema.bots.archetype,
    profilePicUrl: schema.bots.profilePicUrl,
    eloRating: schema.bots.eloRating,
    wins: schema.bots.wins,
    losses: schema.bots.losses,
    winStreak: schema.bots.winStreak,
    bestStreak: schema.bots.bestStreak,
    tier: schema.bots.tier,
    isActive: schema.bots.isActive,
    customization: schema.bots.customization,
    webhookUrl: schema.bots.webhookUrl,
    satsWon: schema.bots.satsWon,
    satsWagered: schema.bots.satsWagered,
  }).from(schema.bots).where(eq(schema.bots.publicKey, pubkey)).limit(1)

  let botData = null
  let botId: string | undefined

  if (rows.length > 0) {
    const bot = rows[0]
    botId = bot.id
    // Auto-upgrade: if creator logs in, ensure archetype + bot mode are correct
    if (isCreatorPubkey(pubkey)) {
      const fixes: Record<string, string> = {}
      if (bot.archetype !== "the_creator") fixes.archetype = "the_creator"
      if (bot.webhookUrl === "http://human.local/") fixes.webhookUrl = "http://poll.local/"
      if (Object.keys(fixes).length > 0) {
        await db.update(schema.bots).set(fixes).where(eq(schema.bots.id, bot.id))
        if (fixes.archetype) bot.archetype = "the_creator"
        if (fixes.webhookUrl) bot.webhookUrl = "http://poll.local/"
      }
    }

    const isHuman = bot.webhookUrl === 'http://human.local/'

    botData = {
      id: bot.id,
      name: bot.name,
      avatarSeed: bot.avatarSeed,
      archetype: bot.archetype,
      profilePicUrl: bot.profilePicUrl,
      eloRating: bot.eloRating,
      wins: bot.wins,
      losses: bot.losses,
      winStreak: bot.winStreak,
      bestStreak: bot.bestStreak,
      tier: bot.tier,
      isActive: bot.isActive,
      isHuman,
      customization: bot.customization ? JSON.parse(bot.customization) : null,
      satsWon: bot.satsWon ?? 0,
      satsWagered: bot.satsWagered ?? 0,
      hasWallet: false,
    }
  } else if (isCreatorPubkey(pubkey)) {
    // Auto-create creator
    const id = nanoid(12)
    const secret = randomBytes(32).toString('hex')
    await db.insert(schema.bots).values({
      id,
      name: 'the_creator',
      webhookUrl: 'http://poll.local/',
      avatarSeed: 'the_creator',
      archetype: 'the_creator',
      secretHash: createHash('sha256').update(secret).digest('hex'),
      publicKey: pubkey,
      profilePicUrl: null,
      customization: null,
      createdAt: new Date().toISOString(),
    })
    botId = id
    botData = {
      id,
      name: 'the_creator',
      avatarSeed: 'the_creator',
      archetype: 'the_creator',
      profilePicUrl: null,
      eloRating: 1200,
      wins: 0,
      losses: 0,
      winStreak: 0,
      bestStreak: 0,
      tier: 0,
      isActive: true,
      isHuman: false,
      customization: null,
      satsWon: 0,
      satsWagered: 0,
      hasWallet: false,
    }
  }

  // Issue JWT (valid for 24 hours)
  const token = createJwt(pubkey, botId)

  return c.json({
    token,
    exists: !!botData,
    pubkey,
    bot: botData,
  })
})

// Regenerate bot secret (requires JWT auth — owner only)
authRouter.post('/regenerate-secret', rateLimit(3_600_000, 3), async (c) => {
  const pubkey = extractPubkeyFromAuth(c.req.header('Authorization'))
  if (!pubkey) {
    return c.json({ error: 'Authentication required.' }, 401)
  }

  const rows = await db.select({
    id: schema.bots.id,
    name: schema.bots.name,
    webhookUrl: schema.bots.webhookUrl,
  })
    .from(schema.bots)
    .where(eq(schema.bots.publicKey, pubkey))
    .limit(1)

  if (rows.length === 0) {
    return c.json({ error: 'No bot found for this key.' }, 404)
  }

  const bot = rows[0]
  const isHuman = bot.webhookUrl === 'http://human.local/'
  if (isHuman) {
    return c.json({ error: 'Human players do not use bot secrets.' }, 400)
  }

  const secret = randomBytes(32).toString('hex')
  await db.update(schema.bots)
    .set({ secretHash: createHash('sha256').update(secret).digest('hex') })
    .where(eq(schema.bots.id, bot.id))

  return c.json({
    botId: bot.id,
    secret,
    message: 'Secret regenerated. Your old secret no longer works. Save this immediately.',
  })
})