require('spec.helpers')

local config = require('pending.config')
local store = require('pending.store')

describe('store', function()
  local tmpdir

  before_each(function()
    tmpdir = vim.fn.tempname()
    vim.fn.mkdir(tmpdir, 'p')
    vim.g.pending = { data_path = tmpdir .. '/tasks.json' }
    config.reset()
    store.unload()
  end)

  after_each(function()
    vim.fn.delete(tmpdir, 'rf')
    vim.g.pending = nil
    config.reset()
  end)

  describe('load', function()
    it('returns empty data when no file exists', function()
      local data = store.load()
      assert.are.equal(1, data.version)
      assert.are.equal(1, data.next_id)
      assert.are.same({}, data.tasks)
    end)

    it('loads existing data', function()
      local path = config.get().data_path
      local f = io.open(path, 'w')
      f:write(vim.json.encode({
        version = 1,
        next_id = 3,
        tasks = {
          {
            id = 1,
            description = 'Pending one',
            status = 'pending',
            entry = '2026-01-01T00:00:00Z',
            modified = '2026-01-01T00:00:00Z',
          },
          {
            id = 2,
            description = 'Pending two',
            status = 'done',
            entry = '2026-01-01T00:00:00Z',
            modified = '2026-01-01T00:00:00Z',
          },
        },
      }))
      f:close()
      local data = store.load()
      assert.are.equal(3, data.next_id)
      assert.are.equal(2, #data.tasks)
      assert.are.equal('Pending one', data.tasks[1].description)
      assert.are.equal('done', data.tasks[2].status)
    end)

    it('preserves unknown fields', function()
      local path = config.get().data_path
      local f = io.open(path, 'w')
      f:write(vim.json.encode({
        version = 1,
        next_id = 2,
        tasks = {
          {
            id = 1,
            description = 'Pending',
            status = 'pending',
            entry = '2026-01-01T00:00:00Z',
            modified = '2026-01-01T00:00:00Z',
            custom_field = 'hello',
          },
        },
      }))
      f:close()
      store.load()
      local task = store.get(1)
      assert.is_not_nil(task._extra)
      assert.are.equal('hello', task._extra.custom_field)
    end)
  end)

  describe('add', function()
    it('creates a task with incremented id', function()
      store.load()
      local t1 = store.add({ description = 'First' })
      local t2 = store.add({ description = 'Second' })
      assert.are.equal(1, t1.id)
      assert.are.equal(2, t2.id)
      assert.are.equal('pending', t1.status)
      assert.are.equal('Todo', t1.category)
    end)

    it('uses provided category', function()
      store.load()
      local t = store.add({ description = 'Test', category = 'Work' })
      assert.are.equal('Work', t.category)
    end)
  end)

  describe('update', function()
    it('updates fields and sets modified', function()
      store.load()
      local t = store.add({ description = 'Original' })
      t.modified = '2025-01-01T00:00:00Z'
      store.update(t.id, { description = 'Updated' })
      local updated = store.get(t.id)
      assert.are.equal('Updated', updated.description)
      assert.is_not.equal('2025-01-01T00:00:00Z', updated.modified)
    end)

    it('sets end timestamp on completion', function()
      store.load()
      local t = store.add({ description = 'Test' })
      assert.is_nil(t['end'])
      store.update(t.id, { status = 'done' })
      local updated = store.get(t.id)
      assert.is_not_nil(updated['end'])
    end)
  end)

  describe('delete', function()
    it('marks task as deleted', function()
      store.load()
      local t = store.add({ description = 'To delete' })
      store.delete(t.id)
      local deleted = store.get(t.id)
      assert.are.equal('deleted', deleted.status)
      assert.is_not_nil(deleted['end'])
    end)
  end)

  describe('save and round-trip', function()
    it('persists and reloads correctly', function()
      store.load()
      store.add({ description = 'Persisted', category = 'Work', priority = 1 })
      store.save()
      store.unload()
      store.load()
      local tasks = store.active_tasks()
      assert.are.equal(1, #tasks)
      assert.are.equal('Persisted', tasks[1].description)
      assert.are.equal('Work', tasks[1].category)
      assert.are.equal(1, tasks[1].priority)
    end)

    it('round-trips unknown fields', function()
      local path = config.get().data_path
      local f = io.open(path, 'w')
      f:write(vim.json.encode({
        version = 1,
        next_id = 2,
        tasks = {
          {
            id = 1,
            description = 'Pending',
            status = 'pending',
            entry = '2026-01-01T00:00:00Z',
            modified = '2026-01-01T00:00:00Z',
            _gcal_event_id = 'abc123',
          },
        },
      }))
      f:close()
      store.load()
      store.save()
      store.unload()
      store.load()
      local task = store.get(1)
      assert.are.equal('abc123', task._extra._gcal_event_id)
    end)
  end)

  describe('active_tasks', function()
    it('excludes deleted tasks', function()
      store.load()
      store.add({ description = 'Active' })
      local t2 = store.add({ description = 'To delete' })
      store.delete(t2.id)
      local active = store.active_tasks()
      assert.are.equal(1, #active)
      assert.are.equal('Active', active[1].description)
    end)
  end)

  describe('snapshot', function()
    it('returns a table of tasks', function()
      store.load()
      store.add({ description = 'Snap one' })
      store.add({ description = 'Snap two' })
      local snap = store.snapshot()
      assert.are.equal(2, #snap)
    end)

    it('returns a copy that does not affect the store', function()
      store.load()
      local t = store.add({ description = 'Original' })
      local snap = store.snapshot()
      snap[1].description = 'Mutated'
      local live = store.get(t.id)
      assert.are.equal('Original', live.description)
    end)

    it('excludes deleted tasks', function()
      store.load()
      local t = store.add({ description = 'Will be deleted' })
      store.delete(t.id)
      local snap = store.snapshot()
      assert.are.equal(0, #snap)
    end)
  end)
end)