require('spec.helpers')

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

describe('store', function()
  local tmpdir
  local s

  before_each(function()
    tmpdir = vim.fn.tempname()
    vim.fn.mkdir(tmpdir, 'p')
    s = store.new(tmpdir .. '/tasks.json')
    s:load()
  end)

  after_each(function()
    vim.fn.delete(tmpdir, 'rf')
    config.reset()
  end)

  describe('load', function()
    it('returns empty data when no file exists', function()
      local data = s: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 = tmpdir .. '/tasks.json'
      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 = s: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 = tmpdir .. '/tasks.json'
      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()
      s:load()
      local task = s: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()
      local t1 = s:add({ description = 'First' })
      local t2 = s: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()
      local t = s:add({ description = 'Test', category = 'Work' })
      assert.are.equal('Work', t.category)
    end)
  end)

  describe('update', function()
    it('updates fields and sets modified', function()
      local t = s:add({ description = 'Original' })
      t.modified = '2025-01-01T00:00:00Z'
      s:update(t.id, { description = 'Updated' })
      local updated = s: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()
      local t = s:add({ description = 'Test' })
      assert.is_nil(t['end'])
      s:update(t.id, { status = 'done' })
      local updated = s:get(t.id)
      assert.is_not_nil(updated['end'])
    end)

    it('does not overwrite id or entry', function()
      local t = s:add({ description = 'Immutable fields' })
      local original_id = t.id
      local original_entry = t.entry
      s:update(t.id, { id = 999, entry = 'x' })
      local updated = s:get(original_id)
      assert.are.equal(original_id, updated.id)
      assert.are.equal(original_entry, updated.entry)
    end)

    it('does not overwrite end on second completion', function()
      local t = s:add({ description = 'Complete twice' })
      s:update(t.id, { status = 'done', ['end'] = '2026-01-15T10:00:00Z' })
      local first_end = s:get(t.id)['end']
      s:update(t.id, { status = 'done' })
      local task = s:get(t.id)
      assert.are.equal(first_end, task['end'])
    end)
  end)

  describe('delete', function()
    it('marks task as deleted', function()
      local t = s:add({ description = 'To delete' })
      s:delete(t.id)
      local deleted = s: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()
      s:add({ description = 'Persisted', category = 'Work', priority = 1 })
      s:save()
      s:load()
      local tasks = s: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 = tmpdir .. '/tasks.json'
      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()
      s:load()
      s:save()
      s:load()
      local task = s:get(1)
      assert.are.equal('abc123', task._extra._gcal_event_id)
    end)
  end)

  describe('recurrence fields', function()
    it('persists recur and recur_mode through round-trip', function()
      s:add({ description = 'Recurring', recur = 'weekly', recur_mode = 'scheduled' })
      s:save()
      s:load()
      local task = s:get(1)
      assert.are.equal('weekly', task.recur)
      assert.are.equal('scheduled', task.recur_mode)
    end)

    it('persists recur without recur_mode', function()
      s:add({ description = 'Simple recur', recur = 'daily' })
      s:save()
      s:load()
      local task = s:get(1)
      assert.are.equal('daily', task.recur)
      assert.is_nil(task.recur_mode)
    end)

    it('omits recur fields when not set', function()
      s:add({ description = 'No recur' })
      s:save()
      s:load()
      local task = s:get(1)
      assert.is_nil(task.recur)
      assert.is_nil(task.recur_mode)
    end)
  end)

  describe('active_tasks', function()
    it('excludes deleted tasks', function()
      s:add({ description = 'Active' })
      local t2 = s:add({ description = 'To delete' })
      s:delete(t2.id)
      local active = s: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()
      s:add({ description = 'Snap one' })
      s:add({ description = 'Snap two' })
      local snap = s:snapshot()
      assert.are.equal(2, #snap)
    end)

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

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