package config

import "testing"

func TestDefaults(t *testing.T) {
    cfg := defaults()

    tests := []struct {
        name string
        got  string
        want string
    }{
        {name: "Ollama.Model", got: cfg.Ollama.Model, want: "qwen3.5:2b"},
        {name: "Ollama.BaseURL", got: cfg.Ollama.BaseURL, want: "http://localhost:11434"},
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            if tt.got != tt.want {
                t.Errorf("%s = %q, want %q", tt.name, tt.got, tt.want)
            }
        })
    }

    if cfg.Ollama.NumCtx != 262144 {
        t.Errorf("Ollama.NumCtx = %d, want %d", cfg.Ollama.NumCtx, 262144)
    }

    if !cfg.Model.AutoSelect {
        t.Error("Model.AutoSelect should be true by default")
    }
}

func TestApplyEnvOverrides(t *testing.T) {
    tests := []struct {
        name    string
        envKey  string
        envVal  string
        checkFn func(cfg *Config) string
        want    string
    }{
        {
            name:   "OLLAMA_HOST overrides BaseURL",
            envKey: "OLLAMA_HOST",
            envVal: "http://custom:1234",
            checkFn: func(cfg *Config) string {
                return cfg.Ollama.BaseURL
            },
            want: "http://custom:1234",
        },
        {
            name:   "LOCAL_AGENT_MODEL overrides Model",
            envKey: "LOCAL_AGENT_MODEL",
            envVal: "custom-model",
            checkFn: func(cfg *Config) string {
                return cfg.Ollama.Model
            },
            want: "custom-model",
        },
        {
            name:   "LOCAL_AGENT_AGENTS_DIR overrides AgentsDir",
            envKey: "LOCAL_AGENT_AGENTS_DIR",
            envVal: "/custom/agents",
            checkFn: func(cfg *Config) string {
                return cfg.Agents.Dir
            },
            want: "/custom/agents",
        },
    }

    for _, tt := range tests {
        t.Run(tt.name, func(t *testing.T) {
            t.Setenv(tt.envKey, tt.envVal)
            cfg := defaults()
            applyEnvOverrides(&cfg)
            got := tt.checkFn(&cfg)
            if got != tt.want {
                t.Errorf("after setting %s=%q, got %q, want %q", tt.envKey, tt.envVal, got, tt.want)
            }
        })
    }
}