package models

import (
	"encoding"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

var _ encoding.TextUnmarshaler = new(Log)

const first = "@begin January 01, 2020 at 01:02:03AM -0000 - This is simple @end\n"
const second = `@begin January 01, 2020 at 01:02:05AM -0000 - We have one thing here
@foo bar @end
`
const third = `@begin January 01, 2020 at 01:02:07AM -0000 - We have two things here
@num 42
@newline true
@end
`
const fourth = `@begin 2020-01-01T01:02:09Z - ISO-8601 date
@end
`
const skip = "@ignoreme true\n"
const fifth = `@begin 2020-01-01T01:02:11+00:00 - ISO-8601 other date
@with-timezone yes @end
`
const badEntry = "@begin bad date no title @end\n"
const all = first + second + third + fourth + skip + fifth

func TestLogUnmarshalBig(t *testing.T) {
	l := &Log{Name: "test-log"}
	err := l.UnmarshalText([]byte(all))
	require.NoError(t, err)
	require.Len(t, l.Entries, 5)

	var e Entry
	var f bool
	if e, f = findEntry(t, l, "This is simple", true); !f {
		return
	}
	assert.Len(t, e.Fields, 0)

	for _, e := range l.Entries {
		findMeta(t, e, "ignoreme", true, false)
	}
}

func TestLogUnmarshalIgnoreGarbage(t *testing.T) {
	l := &Log{Name: "test-log"}
	in := "ignore this\n" + second + "some crap also skip -> " + third + skip
	err := l.UnmarshalText([]byte(in))
	require.NoError(t, err)
	require.Len(t, l.Entries, 1)

	en := l.Entries[0]
	assert.Equal(t, "We have one thing here", en.Title)
	assert.Len(t, en.Fields, 1)
	assert.Equal(t, "foo", en.Fields[0].Key)
	assert.Equal(t, "bar", en.Fields[0].Value)
}

func TestLogUnmarshalEmpty(t *testing.T) {
	l := &Log{Name: "test-log"}
	err := l.UnmarshalText([]byte{})
	require.NoError(t, err)
	require.Len(t, l.Entries, 0)
}

func TestLogUnmarshalBad(t *testing.T) {
	l := &Log{Name: "test-log"}
	err := l.UnmarshalText([]byte(badEntry))
	require.NoError(t, err)
	require.Len(t, l.Entries, 0)
}

func findEntry(t *testing.T, log *Log, title string, shouldFind bool) (Entry, bool) {
	var ret Entry
	found := false
	for _, e := range log.Entries {
		if e.Title == title {
			ret = e
			found = true
		}
	}
	if shouldFind {
		found = assert.Truef(t, found, "Unable to found entry %s", title)
	} else {
		found = assert.Falsef(t, found, "Entry %s should not have been found but was", title)
	}

	return ret, found
}

func findMeta(t *testing.T, entry Entry, key string, value any, shouldFind bool) (Meta, bool) {
	var ret Meta
	found := false
	for _, m := range entry.Fields {
		if m.Key == key && m.Value == value {
			ret = m
			found = true
		}
	}
	if shouldFind {
		found = assert.Truef(t, found, "Unable to found meta %s", key)
	} else {
		found = assert.Falsef(t, found, "Meta %s should not have been found but was", key)
	}

	return ret, found
}