package kvrepl

import "testing"

func TestParse(t *testing.T) {
	var tests = []struct {
		cmds     []string
		db       *DB
		expected string
	}{
		{
			cmds: []string{
				"write a b",
				"start",
				"write a c",
				"abort",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "b",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"write a hello-again",
				"start",
				"delete a",
				"commit",
				"write a once-more",
				"abort",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "b",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"write a hello-again",
				"start",
				"delete a",
				"commit",
				"write a once-more",
				"start",
				"write a foo",
				"abort",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "b",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"write a c",
				"commit",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "c",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"write a c",
				"start",
				"delete a",
				"write a d",
				"commit",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "d",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"write a c",
				"start",
				"delete a",
				"write a d",
				"abort",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "b",
		},
		{
			cmds: []string{
				"write a b",
				"start",
				"delete a",
				"commit",
				"read a",
			},
			db: &DB{
				KV1: map[string]string{},
				KV2: map[string]string{},
				PKV: true,
			},
			expected: "",
		},
	}

	for _, rt := range tests {
		actual := ""
		for _, c := range rt.cmds {
			actual, _ = Parse(c, rt.db)
		}
		if actual != rt.expected {
			t.Errorf(
				"failed parse:\n\texpected: %v\n\t  actual: %v",
				rt.expected,
				actual,
			)
		}
	}
}