describe( 'std.dbg.init', function ()
	local dbg
	local dbg_file
	local mod

	local TEST_FILE = vim.fn.stdpath 'state' .. '/test_init_spec.jsonl'

	local function read_debug_file(path)
		local file = io.open(path, 'r')
		if not file then return nil end
		local content = file:read('*a')
		file:close()
		if not content or content == '' then return nil end
		return content
	end

	local function require_debug_file(path)
		return assert(read_debug_file(path))
	end

	before_each( function ()
		package.loaded['std.dbg'] = nil
		package.loaded['std.dbg.init'] = nil
		package.loaded['std.dbg.file'] = nil
		vim.g.bugabinga_debug_file_override = TEST_FILE
		mod = require 'std.dbg.file'
		dbg_file = TEST_FILE
		vim.fn.delete(dbg_file)
		dbg = require 'std.dbg'
		vim.g.bugabinga_debug_mode = false
	end )

	after_each( function ()
		vim.g.bugabinga_debug_mode = false
		vim.g.bugabinga_debug_file_override = nil
		vim.fn.delete(dbg_file)
	end )

	describe( 'dbg(...) __call', function ()
		it( 'should be callable (no error when called)', function ()
			vim.g.bugabinga_debug_mode = false
			local ok, err = pcall( function () dbg  'test'  end )
			assert.is_true( ok )
		end )

		it( 'should be no-op when debug mode is off', function ()
			vim.g.bugabinga_debug_mode = false
			dbg  'test message'
			local content = read_debug_file(dbg_file)
			assert.is_nil( content )
		end )

		it( 'should write event when debug mode is on', function ()
			vim.g.bugabinga_debug_mode = true
			dbg( 'test {1}', 'hello' )
			local content = require_debug_file(dbg_file)
			assert.is_not_nil( content:match '"kind"' )
			assert.is_not_nil( content:match '"message"' )
			assert.is_not_nil( content:match '"data"' )
		end )

		it( 'should write event with date as os.time() integer', function ()
			vim.g.bugabinga_debug_mode = true
			dbg  'test'
			local content = require_debug_file(dbg_file)
			local json = vim.json.decode( content )
			assert.is_number( json.date )
		end )

		it( 'should have all required fields in written event', function ()
			vim.g.bugabinga_debug_mode = true
			dbg( 'test {1}', 'y' )
			local content = require_debug_file(dbg_file)
			local json = vim.json.decode( content )
			assert.equal( 'DEBUG',    json.kind )
			assert.equal( 'test y', json.message )
			assert.is_table( json.data )
			assert.is_string( json.filename )
			assert.is_string( json.fn )
			assert.is_number( json.line )
		end )
	end )

	describe( 'dbg.kind()', function ()
		it( 'should be a function', function ()
			assert.is_function( dbg.kind )
		end )

		it( 'should log with specified kind', function ()
			vim.g.bugabinga_debug_mode = true
			dbg.kind( 'ERROR', 'error message' )
			local content = require_debug_file(dbg_file)
			local json = vim.json.decode( content )
			assert.equal( 'ERROR', json.kind )
		end )

		it( 'should log TRACE kind', function ()
			vim.g.bugabinga_debug_mode = true
			dbg.kind( 'TRACE', 'trace message' )
			local content = require_debug_file(dbg_file)
			local json = vim.json.decode( content )
			assert.equal( 'TRACE', json.kind )
		end )
	end )

	describe( 'dbg.toggle()', function ()
		it( 'should toggle debug mode from off to on', function ()
			vim.g.bugabinga_debug_mode = false
			assert.is_false( dbg.get() )
			dbg.toggle()
			assert.is_true( dbg.get() )
		end )

		it( 'should toggle debug mode from on to off', function ()
			vim.g.bugabinga_debug_mode = true
			assert.is_true( dbg.get() )
			dbg.toggle()
			assert.is_false( dbg.get() )
		end )
	end )

	describe( 'dbg.get()', function ()
		it( 'should return current debug mode state', function ()
			vim.g.bugabinga_debug_mode = false
			assert.is_false( dbg.get() )
			vim.g.bugabinga_debug_mode = true
			assert.is_true( dbg.get() )
		end )
	end )

	describe( '__newindex guard', function ()
		it( 'should error on assignment attempt', function ()
			local ok, err = pcall( function ()
				dbg.newfield = 'value'
			end )
			assert.is_false( ok )
			assert.is_string( err )
		end )
	end )

	describe( 'user commands', function ()
		it( 'should register :Debug command', function ()
			local ok = pcall( vim.api.nvim_get_command, 'Debug' )
			assert.is_true( ok ~= nil )
		end )

		it( 'should register :DebugOpen command', function ()
			local ok = pcall( vim.api.nvim_get_command, 'DebugOpen' )
			assert.is_true( ok ~= nil )
		end )

		it( 'should register :DebugOpenRaw command', function ()
			local ok = pcall( vim.api.nvim_get_command, 'DebugOpenRaw' )
			assert.is_true( ok ~= nil )
		end )
	end )
end )