package config

import (
	"fmt"
	"strings"
	"testing"

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

func TestConfig_ModelConfigSanitizedCommand(t *testing.T) {
	config := &ModelConfig{
		Cmd: `python model1.py \
    --arg1 value1 \
    --arg2 value2`,
	}

	args, err := config.SanitizedCommand()
	assert.NoError(t, err)
	assert.Equal(t, []string{"python", "model1.py", "--arg1", "value1", "--arg2", "value2"}, args)
}

func TestConfig_ModelFilters(t *testing.T) {
	content := `
macros:
  default_strip: "temperature, top_p"
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    filters:
      # macros inserted and list is cleaned of duplicates and empty strings
      stripParams: "model, top_k, top_k, temperature, ${default_strip}, , ,"
  # check for strip_params (legacy field name) compatibility
  legacy:
    cmd: path/to/cmd --port ${PORT}
    filters:
      strip_params: "model, top_k, top_k, temperature, ${default_strip}, , ,"
`
	config, err := LoadConfigFromReader(strings.NewReader(content))
	assert.NoError(t, err)
	for modelId, modelConfig := range config.Models {
		t.Run(fmt.Sprintf("Testing macros in filters for model %s", modelId), func(t *testing.T) {
			assert.Equal(t, "model, top_k, top_k, temperature, temperature, top_p, , ,", modelConfig.Filters.StripParams)
			sanitized, err := modelConfig.Filters.SanitizedStripParams()
			if assert.NoError(t, err) {
				// model has been removed
				// empty strings have been removed
				// duplicates have been removed
				assert.Equal(t, []string{"temperature", "top_k", "top_p"}, sanitized)
			}
		})
	}
}

func TestConfig_ModelSendLoadingState(t *testing.T) {
	content := `
sendLoadingState: true
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    sendLoadingState: false
  model2:
    cmd: path/to/cmd --port ${PORT}
`
	config, err := LoadConfigFromReader(strings.NewReader(content))
	assert.NoError(t, err)
	assert.True(t, config.SendLoadingState)
	if assert.NotNil(t, config.Models["model1"].SendLoadingState) {
		assert.False(t, *config.Models["model1"].SendLoadingState)
	}
	if assert.NotNil(t, config.Models["model2"].SendLoadingState) {
		assert.True(t, *config.Models["model2"].SendLoadingState)
	}
}

func TestConfig_SetParamsByIDAutoAlias(t *testing.T) {
	content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    filters:
      setParamsByID:
        "${MODEL_ID}:high":
          reasoning_effort: high
        "${MODEL_ID}:low":
          reasoning_effort: low
`
	cfg, err := LoadConfigFromReader(strings.NewReader(content))
	assert.NoError(t, err)

	// Keys (other than the model's own ID) should be registered as aliases
	realName, found := cfg.RealModelName("model1:high")
	assert.True(t, found, "model1:high should be an auto-registered alias")
	assert.Equal(t, "model1", realName)

	realName, found = cfg.RealModelName("model1:low")
	assert.True(t, found, "model1:low should be an auto-registered alias")
	assert.Equal(t, "model1", realName)

	// Auto-aliases should also appear in modelConfig.Aliases
	aliases := cfg.Models["model1"].Aliases
	assert.Contains(t, aliases, "model1:high")
	assert.Contains(t, aliases, "model1:low")
}

func TestConfig_SetParamsByIDAutoAliasConflictWithModelID(t *testing.T) {
	content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    filters:
      setParamsByID:
        model2:
          reasoning_effort: high
  model2:
    cmd: path/to/cmd --port ${PORT}
`
	_, err := LoadConfigFromReader(strings.NewReader(content))
	assert.ErrorContains(t, err, "conflicts with an existing model ID")
}

func TestConfig_SetParamsByIDAutoAliasConflictWithOtherModel(t *testing.T) {
	content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    filters:
      setParamsByID:
        "shared-alias":
          reasoning_effort: high
  model2:
    cmd: path/to/cmd --port ${PORT}
    filters:
      setParamsByID:
        "shared-alias":
          reasoning_effort: low
`
	_, err := LoadConfigFromReader(strings.NewReader(content))
	assert.ErrorContains(t, err, "duplicate alias")
}

func TestConfig_ModelFiltersWithSetParams(t *testing.T) {
	content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    filters:
      stripParams: "top_k"
      setParams:
        temperature: 0.7
        top_p: 0.9
        stop:
          - "<|end|>"
          - "<|stop|>"
 `
	config, err := LoadConfigFromReader(strings.NewReader(content))
	assert.NoError(t, err)

	modelConfig := config.Models["model1"]

	// Check stripParams
	stripParams, err := modelConfig.Filters.SanitizedStripParams()
	assert.NoError(t, err)
	assert.Equal(t, []string{"top_k"}, stripParams)

	// Check setParams
	setParams, keys := modelConfig.Filters.SanitizedSetParams()
	assert.NotNil(t, setParams)
	assert.Equal(t, []string{"stop", "temperature", "top_p"}, keys)
	assert.Equal(t, 0.7, setParams["temperature"])
	assert.Equal(t, 0.9, setParams["top_p"])
}

func TestConfig_ModelCapabilities(t *testing.T) {
	t.Run("all fields", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      in:
        - text
        - audio
        - image
      out:
        - text
        - audio
        - image
      tools: true
      context: 32000
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.False(t, mc.Capabilities.Empty())
		assert.Equal(t, []string{"text", "audio", "image"}, mc.Capabilities.In)
		assert.Equal(t, []string{"text", "audio", "image"}, mc.Capabilities.Out)
		assert.True(t, mc.Capabilities.Tools)
		assert.Equal(t, 32000, mc.Capabilities.Context)
	})

	t.Run("partial fields", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      tools: true
      context: 8192
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.False(t, mc.Capabilities.Empty())
		assert.Nil(t, mc.Capabilities.In)
		assert.Nil(t, mc.Capabilities.Out)
		assert.True(t, mc.Capabilities.Tools)
		assert.Equal(t, 8192, mc.Capabilities.Context)
	})

	t.Run("not set", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.True(t, mc.Capabilities.Empty())
	})

	t.Run("tools false is empty", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      tools: false
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.True(t, mc.Capabilities.Empty())
	})

	t.Run("reranker true is not empty", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      reranker: true
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.False(t, mc.Capabilities.Empty())
		assert.True(t, mc.Capabilities.Reranker)
	})

	t.Run("reranker false is empty", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      reranker: false
`
		config, err := LoadConfigFromReader(strings.NewReader(content))
		assert.NoError(t, err)

		mc := config.Models["model1"]
		assert.True(t, mc.Capabilities.Empty())
	})
}

func TestConfig_ModelCapabilities_Validate(t *testing.T) {
	t.Run("valid_modalities", func(t *testing.T) {
		caps := ModelCapConfig{
			In:      []string{"text", "image"},
			Out:     []string{"text", "audio"},
			Tools:   true,
			Context: 100000,
		}
		assert.NoError(t, caps.Validate())
	})

	t.Run("empty_is_valid", func(t *testing.T) {
		caps := ModelCapConfig{}
		assert.NoError(t, caps.Validate())
	})

	t.Run("invalid_in_modality", func(t *testing.T) {
		caps := ModelCapConfig{In: []string{"video"}}
		err := caps.Validate()
		assert.Error(t, err)
		assert.Contains(t, err.Error(), "capabilities.in")
		assert.Contains(t, err.Error(), "video")
	})

	t.Run("invalid_out_modality", func(t *testing.T) {
		caps := ModelCapConfig{Out: []string{"video"}}
		err := caps.Validate()
		assert.Error(t, err)
		assert.Contains(t, err.Error(), "capabilities.out")
		assert.Contains(t, err.Error(), "video")
	})

	t.Run("negative_context", func(t *testing.T) {
		caps := ModelCapConfig{Context: -1}
		err := caps.Validate()
		assert.Error(t, err)
		assert.Contains(t, err.Error(), "capabilities.context")
	})

	t.Run("rejects_invalid_at_load", func(t *testing.T) {
		content := `
models:
  model1:
    cmd: path/to/cmd --port ${PORT}
    capabilities:
      in:
        - text
        - video
`
		_, err := LoadConfigFromReader(strings.NewReader(content))
		assert.Error(t, err)
		assert.Contains(t, err.Error(), "video")
	})
}