require('spec.helpers')

local config = require('pending.config')

describe('sync', function()
  local tmpdir
  local pending

  before_each(function()
    tmpdir = vim.fn.tempname()
    vim.fn.mkdir(tmpdir, 'p')
    vim.g.pending = { data_path = tmpdir .. '/tasks.json' }
    config.reset()
    package.loaded['pending'] = nil
    pending = require('pending')
  end)

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

  describe('dispatch', function()
    it('errors on unknown subcommand', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.command('notreal')
      vim.notify = orig
      assert.are.equal('[pending.nvim]: Unknown subcommand: notreal', msg)
    end)

    it('errors on unknown action for valid backend', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.command('gcal notreal')
      vim.notify = orig
      assert.are.equal("[pending.nvim]: gcal: No 'notreal' action.", msg)
    end)

    it('lists actions when action is omitted', function()
      local msg = nil
      local orig = vim.notify
      vim.notify = function(m)
        msg = m
      end
      pending.command('gcal')
      vim.notify = orig
      assert.is_not_nil(msg)
      assert.is_truthy(msg:find('push'))
    end)

    it('routes explicit push action', function()
      local called = false
      local gcal = require('pending.sync.gcal')
      local orig_push = gcal.push
      gcal.push = function()
        called = true
      end
      pending.command('gcal push')
      gcal.push = orig_push
      assert.is_true(called)
    end)

    it('routes auth command', function()
      local called = false
      local orig_auth = pending.auth
      pending.auth = function()
        called = true
      end
      pending.command('auth')
      pending.auth = orig_auth
      assert.is_true(called)
    end)
  end)

  it('works with sync.gcal config', function()
    config.reset()
    vim.g.pending = {
      data_path = tmpdir .. '/tasks.json',
      sync = { gcal = { client_id = 'test-id' } },
    }
    local cfg = config.get()
    assert.are.equal('test-id', cfg.sync.gcal.client_id)
  end)

  describe('gcal module', function()
    it('has name field', function()
      local gcal = require('pending.sync.gcal')
      assert.are.equal('gcal', gcal.name)
    end)

    it('has push function', function()
      local gcal = require('pending.sync.gcal')
      assert.are.equal('function', type(gcal.push))
    end)

    it('has health function', function()
      local gcal = require('pending.sync.gcal')
      assert.are.equal('function', type(gcal.health))
    end)

    it('has auth function', function()
      local gcal = require('pending.sync.gcal')
      assert.are.equal('function', type(gcal.auth))
    end)

    it('has auth_complete function', function()
      local gcal = require('pending.sync.gcal')
      local completions = gcal.auth_complete()
      assert.is_true(vim.tbl_contains(completions, 'clear'))
      assert.is_true(vim.tbl_contains(completions, 'reset'))
    end)
  end)

  describe('register_backend', function()
    it('registers a custom backend', function()
      pending.register_backend({ name = 'custom', pull = function() end })
      local set = pending.sync_backend_set()
      assert.is_true(set['custom'] == true)
      assert.is_true(vim.tbl_contains(pending.sync_backends(), 'custom'))
    end)

    it('rejects backend without name', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.register_backend({})
      vim.notify = orig
      assert.truthy(msg and msg:find('non%-empty'))
    end)

    it('rejects backend with empty name', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.register_backend({ name = '' })
      vim.notify = orig
      assert.truthy(msg and msg:find('non%-empty'))
    end)

    it('rejects duplicate of built-in backend', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.register_backend({ name = 'gcal' })
      vim.notify = orig
      assert.truthy(msg and msg:find('already exists'))
    end)

    it('rejects duplicate registered backend', function()
      pending.register_backend({ name = 'dup_test', pull = function() end })
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.register_backend({ name = 'dup_test' })
      vim.notify = orig
      assert.truthy(msg and msg:find('already registered'))
    end)
  end)

  describe('resolve_backend', function()
    it('resolves built-in backend', function()
      local mod = pending.resolve_backend('gcal')
      assert.is_not_nil(mod)
      assert.are.equal('gcal', mod.name)
    end)

    it('resolves registered backend', function()
      local custom = { name = 'resolve_test', pull = function() end }
      pending.register_backend(custom)
      local mod = pending.resolve_backend('resolve_test')
      assert.is_not_nil(mod)
      assert.are.equal('resolve_test', mod.name)
    end)

    it('returns nil for unknown backend', function()
      assert.is_nil(pending.resolve_backend('nonexistent_xyz'))
    end)

    it('dispatches command to registered backend', function()
      local called = false
      pending.register_backend({
        name = 'cmd_test',
        pull = function()
          called = true
        end,
      })
      pending.command('cmd_test pull')
      assert.is_true(called)
    end)
  end)

  describe('auto-discovery', function()
    it('discovers gcal and gtasks backends', function()
      local backends = pending.sync_backends()
      assert.is_true(vim.tbl_contains(backends, 'gcal'))
      assert.is_true(vim.tbl_contains(backends, 'gtasks'))
    end)

    it('excludes modules without name field', function()
      local set = pending.sync_backend_set()
      assert.is_nil(set['oauth'])
      assert.is_nil(set['util'])
    end)

    it('populates backend set correctly', function()
      local set = pending.sync_backend_set()
      assert.is_true(set['gcal'] == true)
      assert.is_true(set['gtasks'] == true)
    end)
  end)

  describe('auth dispatch', function()
    it('routes auth to specific backend', function()
      local called_with = nil
      local gcal = require('pending.sync.gcal')
      local orig_auth = gcal.auth
      gcal.auth = function(args)
        called_with = args or 'default'
      end
      pending.auth('gcal')
      gcal.auth = orig_auth
      assert.are.equal('default', called_with)
    end)

    it('routes auth with sub-action', function()
      local called_with = nil
      local gcal = require('pending.sync.gcal')
      local orig_auth = gcal.auth
      gcal.auth = function(args)
        called_with = args
      end
      pending.auth('gcal clear')
      gcal.auth = orig_auth
      assert.are.equal('clear', called_with)
    end)

    it('errors on unknown backend', function()
      local msg
      local orig = vim.notify
      vim.notify = function(m, level)
        if level == vim.log.levels.ERROR then
          msg = m
        end
      end
      pending.auth('nonexistent')
      vim.notify = orig
      assert.truthy(msg and msg:find('No auth method'))
    end)
  end)
end)