import { describe, expect, it } from 'vitest'
import type { Curve96 } from '@vpp/domain'
import { MemoryTimeSeriesStore } from '../src/timeseries.js'

const curve = (date: string, fill = '1.0'): Curve96 => ({
  interval_minutes: 15,
  date,
  values: Array.from({ length: 96 }, () => fill),
})

let tick = 0
const clock = () => `2026-03-14T08:00:${String(tick++).padStart(2, '0')}Z`

describe('time-series store', () => {
  it('writes a revision and reads it back as latest', () => {
    const store = new MemoryTimeSeriesStore(clock)
    const rec = store.write('load:agg-01', curve('2026-03-14'), 'meter-file')
    expect(rec.version).toBe(1)
    expect(store.latest('load:agg-01', '2026-03-14')).toEqual(rec)
    expect(store.latest('load:agg-01', '2026-03-15')).toBeUndefined()
  })

  it('keeps revision history instead of overwriting (late corrections)', () => {
    const store = new MemoryTimeSeriesStore(clock)
    store.write('load:agg-01', curve('2026-03-14', '1.0'), 'edge')
    const corrected = store.write('load:agg-01', curve('2026-03-14', '1.1'), 'settlement-meter')
    expect(corrected.version).toBe(2)
    const history = store.revisions('load:agg-01', '2026-03-14')
    expect(history.map((r) => r.version)).toEqual([1, 2])
    expect(history[0]!.curve.values[0]).toBe('1.0')
    expect(store.latest('load:agg-01', '2026-03-14')!.curve.values[0]).toBe('1.1')
  })

  it('is idempotent for identical content', () => {
    const store = new MemoryTimeSeriesStore(clock)
    const a = store.write('pv:site-7', curve('2026-03-14'), 'edge')
    const b = store.write('pv:site-7', curve('2026-03-14'), 'edge-retry')
    expect(b).toBe(a)
    expect(store.revisions('pv:site-7', '2026-03-14')).toHaveLength(1)
  })

  it('returns an inclusive date range with latest revision per date, sorted', () => {
    const store = new MemoryTimeSeriesStore(clock)
    store.write('load:agg-01', curve('2026-03-16'), 'edge')
    store.write('load:agg-01', curve('2026-03-14', '1.0'), 'edge')
    store.write('load:agg-01', curve('2026-03-14', '2.0'), 'edge')
    store.write('load:agg-01', curve('2026-03-13'), 'edge')
    store.write('load:agg-01', curve('2026-03-17'), 'edge')
    store.write('pv:site-7', curve('2026-03-15'), 'edge')
    const out = store.range('load:agg-01', '2026-03-14', '2026-03-16')
    expect(out.map((r) => r.date)).toEqual(['2026-03-14', '2026-03-16'])
    expect(out[0]!.version).toBe(2)
  })

  it('rejects malformed curves and empty series ids', () => {
    const store = new MemoryTimeSeriesStore(clock)
    expect(() => store.write('', curve('2026-03-14'), 'edge')).toThrow(/series_id/)
    expect(() =>
      store.write('load:x', { ...curve('2026-03-14'), values: ['1.0'] }, 'edge'),
    ).toThrow()
    expect(() => store.range('load:x', '2026/03/14', '2026-03-15')).toThrow()
  })

  it('stored curves are isolated from caller mutation', () => {
    const store = new MemoryTimeSeriesStore(clock)
    const input = curve('2026-03-14')
    store.write('load:x', input, 'edge')
    input.values[0] = '999'
    expect(store.latest('load:x', '2026-03-14')!.curve.values[0]).toBe('1.0')
  })

  it('lists series ids', () => {
    const store = new MemoryTimeSeriesStore(clock)
    store.write('pv:site-7', curve('2026-03-14'), 'edge')
    store.write('load:agg-01', curve('2026-03-14'), 'edge')
    expect(store.seriesIds()).toEqual(['load:agg-01', 'pv:site-7'])
  })
})