/**
 * Schema-Migration: Teams einführen
 *
 *   - neue Collection 'teams' (name, owner, admins[], users[])
 *   - events, riders, runs, times bekommen ein 'team'-Feld
 *   - listRule/viewRule auf allen vier wird auf team.users.id ?= @request.auth.id umgestellt
 *   - events.users wird entfernt
 *   - Migration der Daten:
 *       Team "Stammtisch Hersbruck" anlegen
 *       Owner = aktuell eingeloggter User (über .env: PB_OWNER_EMAIL falls gesetzt, sonst erster events.users)
 *       users = Union aller events.users
 *       events/riders/runs/times werden alle diesem Team zugeordnet
 *
 * Aufruf:  npm run migrate-teams
 */

import { readFileSync } from 'node:fs'

// .env parsen — Zeilen die mit . anfangen werden an die vorherige Variable angehängt
// (Workaround für zerbrochene JWT-Tokens über mehrere Zeilen)
const env = readFileSync('.env', 'utf8').split('\n')
let lastKey = ''
for (const line of env) {
    const m = line.match(/^([A-Z_]+)=(.*)$/)
    if (m) {
        process.env[m[1]] = m[2]
        lastKey = m[1]
    } else if (lastKey && line.length > 0) {
        process.env[lastKey] = (process.env[lastKey] ?? '') + line
    }
}

const API = process.env.PB_TYPEGEN_URL?.replace(/\/$/, '') ?? 'https://api.stammtisch-hersbruck.de'
const TOKEN = process.env.PB_SUPERUSER_TOKEN

if (!TOKEN) {
    console.error('PB_SUPERUSER_TOKEN fehlt')
    process.exit(1)
}

const headers = { Authorization: TOKEN, 'Content-Type': 'application/json' }

async function req(method: string, path: string, body?: unknown) {
    const res = await fetch(`${API}${path}`, {
        method,
        headers,
        body: body ? JSON.stringify(body) : undefined,
    })
    if (!res.ok) throw new Error(`${method} ${path} → ${res.status}: ${await res.text()}`)
    return res.status === 204 ? null : await res.json()
}

async function getCollection(name: string) {
    try {
        return await req('GET', `/api/collections/${name}`)
    } catch {
        return null
    }
}

async function createCollection(body: any) {
    return req('POST', '/api/collections', body)
}

async function updateCollection(name: string, body: any) {
    return req('PATCH', `/api/collections/${name}`, body)
}

async function listAll(collection: string) {
    const all: any[] = []
    let page = 1
    while (true) {
        const res: any = await req('GET', `/api/collections/${collection}/records?page=${page}&perPage=200`)
        all.push(...res.items)
        if (page >= res.totalPages || res.totalPages === 0) break
        page++
    }
    return all
}

async function updateRecord(collection: string, id: string, data: any) {
    return req('PATCH', `/api/collections/${collection}/records/${id}`, data)
}

async function createRecord(collection: string, data: any) {
    return req('POST', `/api/collections/${collection}/records`, data)
}

function hasField(coll: any, name: string) {
    return coll.fields.some((f: any) => f.name === name)
}

const USERS_AUTH = '_pb_users_auth_'

// ---- Schritt 1: teams Collection anlegen ----

async function ensureTeamsCollection() {
    console.log('\n== teams Collection ==')
    const existing = await getCollection('teams')
    if (existing) {
        console.log('  = teams existiert bereits')
        return existing
    }

    const body = {
        name: 'teams',
        type: 'base',
        listRule: 'users.id ?= @request.auth.id',
        viewRule: 'users.id ?= @request.auth.id',
        createRule: '@request.auth.id != ""',
        updateRule: 'owner.id ?= @request.auth.id || admins.id ?= @request.auth.id',
        deleteRule: 'owner.id ?= @request.auth.id',
        fields: [
            {
                name: 'name',
                type: 'text',
                required: true,
                presentable: true,
                max: 100,
                min: 1,
                pattern: '',
                autogeneratePattern: '',
            },
            {
                name: 'owner',
                type: 'relation',
                required: true,
                maxSelect: 1,
                minSelect: 1,
                collectionId: USERS_AUTH,
                cascadeDelete: false,
            },
            {
                name: 'admins',
                type: 'relation',
                required: false,
                maxSelect: 999,
                minSelect: 0,
                collectionId: USERS_AUTH,
                cascadeDelete: false,
            },
            {
                name: 'users',
                type: 'relation',
                required: false,
                maxSelect: 999,
                minSelect: 0,
                collectionId: USERS_AUTH,
                cascadeDelete: false,
            },
            {
                name: 'created',
                type: 'autodate',
                onCreate: true,
                onUpdate: false,
            },
            {
                name: 'updated',
                type: 'autodate',
                onCreate: true,
                onUpdate: true,
            },
        ],
    }

    const created = await createCollection(body)
    console.log('  + Collection "teams" angelegt')
    return created
}

// ---- Schritt 2: team-Feld zu events/riders/runs/times hinzufügen ----

async function addTeamField(collName: string) {
    const coll = await getCollection(collName)
    if (!coll) throw new Error(`Collection ${collName} fehlt`)

    if (hasField(coll, 'team')) {
        console.log(`  = ${collName}.team existiert bereits`)
        return
    }

    const fields = [
        ...coll.fields,
        {
            name: 'team',
            type: 'relation',
            required: false,
            maxSelect: 1,
            minSelect: 0,
            collectionId: (await getCollection('teams'))!.id,
            cascadeDelete: false,
        },
    ]

    await updateCollection(collName, { fields })
    console.log(`  + ${collName}.team hinzugefügt`)
}

// ---- Schritt 3: Default-Team anlegen + alle Records zuordnen ----

async function migrateData(teamsId: string) {
    console.log('\n== Daten-Migration ==')

    // Owner-User suchen
    const ownerEmail = process.env.PB_OWNER_EMAIL || 'stammtisch-hersbruck@dne.name'
    const usersRes: any = await req(
        'GET',
        `/api/collections/${USERS_AUTH}/records?filter=` + encodeURIComponent(`email = "${ownerEmail}"`),
    )
    if (!usersRes.items.length) {
        throw new Error(`User mit E-Mail "${ownerEmail}" nicht gefunden. Setze PB_OWNER_EMAIL in .env.`)
    }
    const owner = usersRes.items[0]
    console.log(`  Owner: ${owner.email} (${owner.id})`)

    // Existierendes Team suchen
    const teamsList: any = await req('GET', `/api/collections/teams/records?filter=` + encodeURIComponent(`name = "Stammtisch Hersbruck"`))
    let team: any = teamsList.items[0]
    if (!team) {
        // alle User aus events.users sammeln
        const events = await listAll('events')
        const userSet = new Set<string>([owner.id])
        for (const e of events) {
            if (Array.isArray(e.users)) for (const u of e.users) userSet.add(u)
        }
        team = await createRecord('teams', {
            name: 'Stammtisch Hersbruck',
            owner: owner.id,
            admins: [],
            users: [...userSet],
        })
        console.log(`  + Team "Stammtisch Hersbruck" mit ${userSet.size} Mitgliedern angelegt`)
    } else {
        console.log(`  = Team "Stammtisch Hersbruck" existiert (${team.id})`)
    }

    // Datensätze ohne team patchen
    for (const collName of ['events', 'riders', 'runs', 'times']) {
        const records = await listAll(collName)
        let touched = 0
        for (const r of records) {
            if (!r.team) {
                await updateRecord(collName, r.id, { team: team.id })
                touched++
            }
        }
        console.log(`  → ${collName}: ${touched} Records zugeordnet (${records.length - touched} bereits gesetzt)`)
    }

    return team
}

// ---- Schritt 4: Rules auf team-basiert umstellen ----

async function updateRules() {
    console.log('\n== Rules auf team-basiert umstellen ==')

    const rules = {
        events: {
            listRule: 'team.users.id ?= @request.auth.id',
            viewRule: 'team.users.id ?= @request.auth.id',
            createRule: 'team.users.id ?= @request.auth.id',
            updateRule: 'team.users.id ?= @request.auth.id',
            deleteRule: 'team.users.id ?= @request.auth.id',
        },
        riders: {
            listRule: 'team.users.id ?= @request.auth.id',
            viewRule: 'team.users.id ?= @request.auth.id',
            createRule: 'team.users.id ?= @request.auth.id',
            updateRule: 'team.users.id ?= @request.auth.id',
            deleteRule: 'team.users.id ?= @request.auth.id',
        },
        runs: {
            listRule: 'team.users.id ?= @request.auth.id',
            viewRule: 'team.users.id ?= @request.auth.id',
            createRule: 'team.users.id ?= @request.auth.id',
            updateRule: 'team.users.id ?= @request.auth.id',
            deleteRule: 'team.users.id ?= @request.auth.id',
        },
        times: {
            listRule: 'team.users.id ?= @request.auth.id',
            viewRule: 'team.users.id ?= @request.auth.id',
            createRule: 'team.users.id ?= @request.auth.id',
            updateRule: 'team.users.id ?= @request.auth.id',
            deleteRule: 'team.users.id ?= @request.auth.id',
        },
    }

    for (const [coll, r] of Object.entries(rules)) {
        await updateCollection(coll, r)
        console.log(`  ~ ${coll} Rules aktualisiert`)
    }
}

// ---- Schritt 5: events.users entfernen ----

async function removeEventsUsers() {
    console.log('\n== events.users entfernen ==')
    const coll = await getCollection('events')
    if (!coll) return
    if (!hasField(coll, 'users')) {
        console.log('  = events.users existiert nicht (mehr)')
        return
    }
    const fields = coll.fields.filter((f: any) => f.name !== 'users')
    await updateCollection('events', { fields })
    console.log('  - events.users entfernt')
}

// ---- Main ----

async function main() {
    console.log(`Migration gegen ${API}`)
    const teams = await ensureTeamsCollection()
    console.log('\n== team-Feld zu Collections hinzufügen ==')
    await addTeamField('events')
    await addTeamField('riders')
    await addTeamField('runs')
    await addTeamField('times')
    await migrateData(teams.id)
    await updateRules()
    await removeEventsUsers()
    console.log('\n✓ Teams-Migration fertig')
}

main().catch((e) => {
    console.error('\n✗ Fehler:', e.message)
    process.exit(1)
})