package conf_test

import (
	"fmt"
	"os"
	"path/filepath"
	"testing"

	"github.com/navidrome/navidrome/conf"
	. "github.com/onsi/ginkgo/v2"
	. "github.com/onsi/gomega"
	"github.com/spf13/viper"
)

func TestConfiguration(t *testing.T) {
	RegisterFailHandler(Fail)
	RunSpecs(t, "Configuration Suite")
}

var _ = Describe("Configuration", func() {
	BeforeEach(func() {
		// Reset viper configuration
		viper.Reset()
		conf.SetViperDefaults()
		viper.SetDefault("datafolder", GinkgoT().TempDir())
		viper.SetDefault("loglevel", "error")
		conf.ResetConf()

		// Panic instead of exiting on fatal errors to allow testing error conditions
		DeferCleanup(conf.SetLogFatal(func(args ...any) {
			panic(fmt.Sprint(args...))
		}))
	})

	Describe("ParseLanguages", func() {
		It("parses single language", func() {
			Expect(conf.ParseLanguages("en")).To(Equal([]string{"en"}))
		})

		It("parses multiple comma-separated languages", func() {
			Expect(conf.ParseLanguages("pt,en")).To(Equal([]string{"pt", "en"}))
		})

		It("trims whitespace from languages", func() {
			Expect(conf.ParseLanguages(" pt , en ")).To(Equal([]string{"pt", "en"}))
		})

		It("returns default 'en' when empty", func() {
			Expect(conf.ParseLanguages("")).To(Equal([]string{"en"}))
		})

		It("returns default 'en' when only whitespace", func() {
			Expect(conf.ParseLanguages("   ")).To(Equal([]string{"en"}))
		})

		It("handles multiple languages with various spacing", func() {
			Expect(conf.ParseLanguages("ja, pt, en")).To(Equal([]string{"ja", "pt", "en"}))
		})
	})

	Describe("ValidateURL", func() {
		It("accepts a valid http URL", func() {
			fn := conf.ValidateURL("TestOption", "http://example.com/path")
			Expect(fn()).To(Succeed())
		})

		It("accepts a valid https URL", func() {
			fn := conf.ValidateURL("TestOption", "https://example.com/path")
			Expect(fn()).To(Succeed())
		})

		It("rejects a URL with no scheme", func() {
			fn := conf.ValidateURL("TestOption", "example.com/path")
			Expect(fn()).To(MatchError(ContainSubstring("invalid scheme")))
		})

		It("rejects a URL with an unsupported scheme", func() {
			fn := conf.ValidateURL("TestOption", "javascript://example.com/path")
			Expect(fn()).To(MatchError(ContainSubstring("invalid scheme")))
		})

		It("accepts an empty URL (optional config)", func() {
			fn := conf.ValidateURL("TestOption", "")
			Expect(fn()).To(Succeed())
		})

		It("includes the option name in the error message", func() {
			fn := conf.ValidateURL("MyOption", "ftp://example.com")
			Expect(fn()).To(MatchError(ContainSubstring("MyOption")))
		})

		It("rejects a URL that cannot be parsed", func() {
			fn := conf.ValidateURL("TestOption", "://invalid")
			Expect(fn()).To(HaveOccurred())
		})

		It("rejects a URL without a host", func() {
			fn := conf.ValidateURL("TestOption", "http:///path")
			Expect(fn()).To(MatchError(ContainSubstring("non-empty host is required")))
		})
	})

	DescribeTable("NormalizeSearchBackend",
		func(input, expected string) {
			Expect(conf.NormalizeSearchBackend(input)).To(Equal(expected))
		},
		Entry("accepts 'fts'", "fts", "fts"),
		Entry("accepts 'legacy'", "legacy", "legacy"),
		Entry("normalizes 'FTS' to lowercase", "FTS", "fts"),
		Entry("normalizes 'Legacy' to lowercase", "Legacy", "legacy"),
		Entry("trims whitespace", "  fts  ", "fts"),
		Entry("falls back to 'fts' for 'fts5'", "fts5", "fts"),
		Entry("falls back to 'fts' for unrecognized values", "invalid", "fts"),
		Entry("falls back to 'fts' for empty string", "", "fts"),
	)

	DescribeTable("ToPascalCase",
		func(input, expected string) {
			Expect(conf.ToPascalCase(input)).To(Equal(expected))
		},
		Entry("simple key", "address", "Address"),
		Entry("dotted key", "scanner.schedule", "Scanner.Schedule"),
		Entry("already capitalized", "Address", "Address"),
		Entry("multi-segment", "lastfm.enabled", "Lastfm.Enabled"),
		Entry("empty string", "", ""),
	)

	Describe("remapEnvVarKeysFromConfig", func() {
		BeforeEach(func() {
			viper.Reset()
			conf.SetViperDefaults()
			viper.SetDefault("datafolder", GinkgoT().TempDir())
			viper.SetDefault("loglevel", "error")
			conf.ResetConf()
		})

		It("remaps ND_-prefixed keys to canonical keys", func() {
			filename := filepath.Join("testdata", "cfg_nd_keys.toml")
			conf.InitConfig(filename, false)
			conf.Load(true)

			Expect(conf.Server.Address).To(Equal("127.0.0.1"))
			Expect(conf.Server.Port).To(Equal(4531))
			Expect(conf.Server.Scanner.Schedule).To(Equal("@every 1h"))
		})

		It("exits with fatal error when both ND_ and canonical key exist", func() {
			filename := filepath.Join("testdata", "cfg_nd_conflict.toml")
			conf.InitConfig(filename, false)

			Expect(func() { conf.Load(true) }).To(PanicWith(And(
				ContainSubstring("ND_ADDRESS"),
				ContainSubstring("Address"),
				ContainSubstring("only needed for environment variables"),
			)))
		})

		It("does nothing when no ND_ keys are present", func() {
			filename := filepath.Join("testdata", "cfg.toml")
			conf.InitConfig(filename, false)
			conf.Load(true)

			// Verify normal config loading still works
			Expect(conf.Server.MusicFolder).To(Equal("/toml/music"))
		})
	})

	Describe("logFatal", func() {
		var invalidPath string
		BeforeEach(func() {
			viper.Reset()
			conf.SetViperDefaults()
			viper.SetDefault("loglevel", "error")
			conf.ResetConf()

			// Create a file so that any path under it is invalid on all OSes
			f, err := os.CreateTemp(GinkgoT().TempDir(), "blocker")
			Expect(err).ToNot(HaveOccurred())
			f.Close()
			invalidPath = filepath.Join(f.Name(), "subdir")
		})

		It("is called when LoadFromFile gets an invalid config file", func() {
			Expect(func() {
				conf.LoadFromFile(filepath.Join(invalidPath, "file.toml"))
			}).To(PanicWith(ContainSubstring("Error reading config file")))
		})

		It("is called when DataFolder is not writable", func() {
			viper.SetDefault("datafolder", invalidPath)
			Expect(func() {
				conf.Load(true)
			}).To(PanicWith(ContainSubstring("Error creating data path")))
		})

		It("is called when CacheFolder is not writable", func() {
			viper.SetDefault("datafolder", GinkgoT().TempDir())
			viper.SetDefault("cachefolder", invalidPath)
			Expect(func() {
				conf.Load(true)
			}).To(PanicWith(ContainSubstring("Error creating cache path")))
		})

		It("is called when LogFile path is not writable", func() {
			viper.SetDefault("datafolder", GinkgoT().TempDir())
			viper.SetDefault("logfile", filepath.Join(invalidPath, "log.txt"))
			Expect(func() {
				conf.Load(true)
			}).To(PanicWith(ContainSubstring("Error opening log file")))
		})

		It("is called when BaseURL is invalid", func() {
			viper.SetDefault("datafolder", GinkgoT().TempDir())
			viper.SetDefault("baseurl", "://invalid")
			Expect(func() {
				conf.Load(true)
			}).To(PanicWith(ContainSubstring("Invalid BaseURL")))
		})

	})

	DescribeTable("should load configuration from",
		func(format string) {
			filename := filepath.Join("testdata", "cfg."+format)

			// Initialize config with the test file
			conf.InitConfig(filename, false)
			// Load the configuration (with noConfigDump=true)
			conf.Load(true)

			// Execute the format-specific assertions
			Expect(conf.Server.MusicFolder).To(Equal(fmt.Sprintf("/%s/music", format)))
			Expect(conf.Server.UIWelcomeMessage).To(Equal("Welcome " + format))
			Expect(conf.Server.Tags["custom"].Aliases).To(Equal([]string{format, "test"}))
			Expect(conf.Server.Tags["artist"].Split).To(Equal([]string{";"}))

			// Check deprecated option mapping
			Expect(conf.Server.ExtAuth.UserHeader).To(Equal("X-Auth-User"))

			// The config file used should be the one we created
			Expect(conf.Server.ConfigFile).To(Equal(filename))
		},
		Entry("TOML format", "toml"),
		Entry("YAML format", "yaml"),
		Entry("INI format", "ini"),
		Entry("JSON format", "json"),
	)
})