// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

package model

import (
	"encoding/json"
	"testing"

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

func TestMergeQueryIntoURL(t *testing.T) {
	t.Run("empty query returns rawURL unchanged", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook", nil)
		require.NoError(t, err)
		assert.Equal(t, "http://example.com/hook", got)

		got, err = MergeQueryIntoURL("http://example.com/hook", map[string]string{})
		require.NoError(t, err)
		assert.Equal(t, "http://example.com/hook", got)
	})

	t.Run("URL without existing query gets query appended", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook", map[string]string{"a": "1"})
		require.NoError(t, err)
		assert.Equal(t, "http://example.com/hook?a=1", got)
	})

	t.Run("URL with existing query merges non-overlapping keys", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook?team=alpha", map[string]string{"source": "fleet"})
		require.NoError(t, err)
		assert.Contains(t, got, "team=alpha")
		assert.Contains(t, got, "source=fleet")
	})

	t.Run("query map overrides existing key on overlap", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook?tail=999", map[string]string{"tail": "214"})
		require.NoError(t, err)
		assert.Equal(t, "http://example.com/hook?tail=214", got)
	})

	t.Run("URL fragment is preserved", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook#anchor", map[string]string{"a": "1"})
		require.NoError(t, err)
		assert.Equal(t, "http://example.com/hook?a=1#anchor", got)
	})

	t.Run("special characters in values are URL-encoded", func(t *testing.T) {
		got, err := MergeQueryIntoURL("http://example.com/hook", map[string]string{"q": "a b&c=d"})
		require.NoError(t, err)
		assert.Contains(t, got, "q=a+b%26c%3Dd")
	})

	t.Run("relative URL with empty path accepts query merge", func(t *testing.T) {
		got, err := MergeQueryIntoURL("/plugins/myplugin/action", map[string]string{"a": "1"})
		require.NoError(t, err)
		assert.Equal(t, "/plugins/myplugin/action?a=1", got)
	})

	t.Run("malformed URL returns parse error", func(t *testing.T) {
		_, err := MergeQueryIntoURL("://not-a-url", map[string]string{"a": "1"})
		require.Error(t, err)
		assert.Contains(t, err.Error(), "parse url")
	})
}

func TestResolveMmBlocksAction(t *testing.T) {
	t.Run("openURL", func(t *testing.T) {
		resolved, err := ResolveMmBlocksAction(&MmBlocksActionSpec{
			Type:  MmBlocksActionTypeOpenURL,
			URL:   "https://example.com/page",
			Query: map[string]string{"a": "b"},
		}, "open1", nil)
		require.NoError(t, err)
		assert.Contains(t, resolved.OpenURLGoto, "a=b")
	})

	t.Run("external merges client query", func(t *testing.T) {
		resolved, err := ResolveMmBlocksAction(&MmBlocksActionSpec{
			Type:    MmBlocksActionTypeExternal,
			URL:     "https://hooks.example.com/x",
			Context: map[string]any{"k": "v"},
		}, "ext1", map[string]string{"client": "q"})
		require.NoError(t, err)
		assert.Contains(t, resolved.ExternalURL, "client=q")
		assert.Equal(t, "v", resolved.Context["k"])
	})

	t.Run("not found", func(t *testing.T) {
		_, err := ResolveMmBlocksAction(nil, "missing", nil)
		require.Error(t, err)
		assert.ErrorIs(t, err, ErrMmBlocksActionNotFound)
	})

	t.Run("openURL empty url", func(t *testing.T) {
		_, err := ResolveMmBlocksAction(&MmBlocksActionSpec{Type: MmBlocksActionTypeOpenURL}, "open1", nil)
		require.Error(t, err)
		assert.ErrorIs(t, err, ErrMmBlocksActionNotFound)
	})

	t.Run("external empty url", func(t *testing.T) {
		_, err := ResolveMmBlocksAction(&MmBlocksActionSpec{Type: MmBlocksActionTypeExternal}, "ext1", nil)
		require.Error(t, err)
		assert.ErrorIs(t, err, ErrMmBlocksActionNotFound)
	})

	t.Run("unknown type", func(t *testing.T) {
		_, err := ResolveMmBlocksAction(&MmBlocksActionSpec{Type: "other", URL: "https://example.com"}, "x", nil)
		require.Error(t, err)
		assert.ErrorIs(t, err, ErrMmBlocksActionNotFound)
	})
}

func TestPostGetMmBlocksActionSpec(t *testing.T) {
	p := &Post{}
	p.SetProps(StringInterface{
		PostPropsMmBlocksActions: map[string]any{
			"act1": map[string]any{
				"type":    MmBlocksActionTypeExternal,
				"url":     "https://hooks.example.com/x?keep=yes",
				"context": map[string]any{"k": "v"},
				"query":   map[string]any{"a": "1", "keep": "no"},
			},
			"open1": map[string]any{
				"type": MmBlocksActionTypeOpenURL,
				"url":  "https://example.com/page",
			},
		},
	})
	ext := p.GetMmBlocksActionSpec("act1")
	require.NotNil(t, ext)
	assert.Equal(t, MmBlocksActionTypeExternal, ext.Type)
	assert.Equal(t, "https://hooks.example.com/x?keep=yes", ext.URL)
	require.NotNil(t, ext.Context)
	assert.Equal(t, "v", ext.Context["k"])
	assert.Equal(t, "1", ext.Query["a"])
	assert.Equal(t, "no", ext.Query["keep"])

	open := p.GetMmBlocksActionSpec("open1")
	require.NotNil(t, open)
	assert.Equal(t, MmBlocksActionTypeOpenURL, open.Type)

	assert.Nil(t, p.GetMmBlocksActionSpec("missing"))
	assert.Nil(t, p.GetMmBlocksActionSpec(""))

	t.Run("encryptedProp", func(t *testing.T) {
		p := &Post{}
		p.SetProps(StringInterface{
			PostPropsMmBlocksActions: "opaque-ciphertext",
		})
		assert.Nil(t, p.GetMmBlocksActionSpec("any"))
	})
}

func TestMmBlocksActionCookie(t *testing.T) {
	t.Run("actionSpec", func(t *testing.T) {
		var nilCookie *MmBlocksActionCookie
		assert.Nil(t, nilCookie.ActionSpec("a"))

		cookie := &MmBlocksActionCookie{
			Actions: map[string]map[string]any{
				"ext": {
					"type": MmBlocksActionTypeExternal,
					"url":  "https://example.com/hook",
				},
			},
		}
		spec := cookie.ActionSpec("ext")
		require.NotNil(t, spec)
		assert.Equal(t, MmBlocksActionTypeExternal, spec.Type)
		assert.Nil(t, cookie.ActionSpec("missing"))
		assert.Nil(t, cookie.ActionSpec(""))
	})
}

func TestStripMmBlocksActionSecrets(t *testing.T) {
	t.Run("absent prop is a no-op", func(t *testing.T) {
		p := &Post{}
		assert.NotPanics(t, func() {
			p.StripMmBlocksActionSecrets()
		})
		assert.Nil(t, p.GetProp(PostPropsMmBlocksActions))
	})

	t.Run("map-form prop is deleted", func(t *testing.T) {
		p := &Post{}
		p.SetProps(StringInterface{
			PostPropsMmBlocksActions: map[string]any{
				"a": map[string]any{
					"type": MmBlocksActionTypeExternal,
					"url":  "https://secret",
				},
			},
		})
		p.StripMmBlocksActionSecrets()
		assert.Nil(t, p.GetProp(PostPropsMmBlocksActions))
	})

	t.Run("encrypted string prop is preserved", func(t *testing.T) {
		p := &Post{}
		p.SetProps(StringInterface{
			PostPropsMmBlocksActions: "opaque-ciphertext",
		})
		p.StripMmBlocksActionSecrets()
		assert.Equal(t, "opaque-ciphertext", p.GetProp(PostPropsMmBlocksActions))
	})

	t.Run("other props on the post are not touched", func(t *testing.T) {
		p := &Post{}
		p.AddProp(PostPropsMmBlocksActions, map[string]any{
			"btn1": map[string]any{
				"type": MmBlocksActionTypeExternal,
				"url":  "http://example.com/hook",
			},
		})
		p.AddProp(PostPropsAttachments, []*MessageAttachment{{Text: "keep me"}})
		p.AddProp(PostPropsFromBot, "true")

		p.StripMmBlocksActionSecrets()

		assert.Nil(t, p.GetProp(PostPropsMmBlocksActions))
		assert.NotNil(t, p.GetProp(PostPropsAttachments))
		assert.Equal(t, "true", p.GetProp(PostPropsFromBot))
	})
}

func TestAddMmBlocksActionCookies(t *testing.T) {
	t.Run("replacesWithEncryptedString", func(t *testing.T) {
		secret := make([]byte, 32)
		for i := range secret {
			secret[i] = byte(i + 1)
		}
		p := &Post{}
		p.Id = "postid"
		p.ChannelId = "chid"
		p.UserId = "userid1"
		p.SetProps(StringInterface{
			PostPropsMmBlocksActions: map[string]any{
				"a1": map[string]any{
					"type":    MmBlocksActionTypeExternal,
					"url":     "https://example.com/hook?keep=1",
					"context": map[string]any{"k": "v"},
					"query":   map[string]any{"keep": "2", "a": "b"},
				},
			},
		})
		AddMmBlocksActionCookies(p, secret)
		raw := p.GetProp(PostPropsMmBlocksActions)
		s, ok := raw.(string)
		require.True(t, ok)
		require.NotEmpty(t, s)

		plain, err := DecryptPostActionCookie(s, secret)
		require.NoError(t, err)
		legacy, mm, err := ParseDecryptedActionCookiePayload(plain)
		require.NoError(t, err)
		require.Nil(t, legacy)
		require.NotNil(t, mm)
		require.Equal(t, MmBlocksActionCookieKind, mm.Kind)
		spec := mm.ActionSpec("a1")
		require.NotNil(t, spec)
		require.NotNil(t, spec.Context)
		assert.Equal(t, "v", spec.Context["k"])
		assert.Equal(t, "postid", mm.PostId)
		assert.Equal(t, "chid", mm.ChannelId)
		assert.Contains(t, spec.URL, "example.com")
		assert.Equal(t, "b", spec.Query["a"])
		assert.Equal(t, "2", spec.Query["keep"])
	})

	t.Run("rootPostIdAndRetain", func(t *testing.T) {
		secret := make([]byte, 32)
		p := &Post{Id: "postid", RootId: "rootid", ChannelId: "chid"}
		p.SetProps(StringInterface{
			PostPropsFromWebhook: "true",
			PostPropsMmBlocksActions: map[string]any{
				"a1": map[string]any{
					"type": MmBlocksActionTypeOpenURL,
					"url":  "https://example.com",
				},
			},
		})
		AddMmBlocksActionCookies(p, secret)

		plain, err := DecryptPostActionCookie(p.GetProp(PostPropsMmBlocksActions).(string), secret)
		require.NoError(t, err)
		_, mm, err := ParseDecryptedActionCookiePayload(plain)
		require.NoError(t, err)
		assert.Equal(t, "rootid", mm.RootPostId)
		assert.Equal(t, "true", mm.RetainProps[PostPropsFromWebhook])
	})
}

func TestParseDecryptedActionCookiePayload(t *testing.T) {
	t.Run("legacyPostActionCookie", func(t *testing.T) {
		c := &PostActionCookie{
			PostId:    "p1",
			ChannelId: "c1",
			Integration: &PostActionIntegration{
				URL: "https://hooks.example.com/x",
			},
		}
		b, err := json.Marshal(c)
		require.NoError(t, err)
		legacy, mm, err := ParseDecryptedActionCookiePayload(string(b))
		require.NoError(t, err)
		require.NotNil(t, legacy)
		require.Nil(t, mm)
		assert.Equal(t, "p1", legacy.PostId)
		assert.Equal(t, "https://hooks.example.com/x", legacy.Integration.URL)
	})

	t.Run("mmBlocksCookie", func(t *testing.T) {
		mm := &MmBlocksActionCookie{
			Kind:      MmBlocksActionCookieKind,
			PostId:    "p1",
			ChannelId: "c1",
			Actions: map[string]map[string]any{
				"a": {"type": MmBlocksActionTypeOpenURL, "url": "https://example.com"},
			},
		}
		b, err := json.Marshal(mm)
		require.NoError(t, err)
		legacy, parsed, err := ParseDecryptedActionCookiePayload(string(b))
		require.NoError(t, err)
		require.Nil(t, legacy)
		require.NotNil(t, parsed)
		assert.Equal(t, MmBlocksActionCookieKind, parsed.Kind)
		assert.Equal(t, "p1", parsed.PostId)
	})

	t.Run("invalidJSON", func(t *testing.T) {
		_, _, err := ParseDecryptedActionCookiePayload("{")
		require.Error(t, err)
	})
}